/*
 * Linux-DVB Driver for DiBcom's DiB8000 chip (ISDB-T).
 *
 * Copyright (C) 2009 DiBcom (http://www.dibcom.fr/)
 *
 * This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License as
 *  published by the Free Software Foundation, version 2.
 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <asm/div64.h>

#include "dvb_math.h"

#include "dvb_frontend.h"

#include "dib8000.h"

#define LAYER_ALL -1
#define LAYER_A   1
#define LAYER_B   2
#define LAYER_C   3

#define MAX_NUMBER_OF_FRONTENDS 6
/* #define DIB8000_AGC_FREEZE */

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "turn on debugging (default: 0)");

#define dprintk(args...) do { if (debug) { printk(KERN_DEBUG "DiB8000: "); printk(args); printk("\n"); } } while (0)

struct i2c_device {
        struct i2c_adapter *adap;
        u8 addr;
        u8 *i2c_write_buffer;
        u8 *i2c_read_buffer;
        struct mutex *i2c_buffer_lock;
};

enum param_loop_step {
        LOOP_TUNE_1,
        LOOP_TUNE_2
};

enum dib8000_autosearch_step {
        AS_START = 0,
        AS_SEARCHING_FFT,
        AS_SEARCHING_GUARD,
        AS_DONE = 100,
};

enum timeout_mode {
        SYMBOL_DEPENDENT_OFF = 0,
        SYMBOL_DEPENDENT_ON,
};

struct dib8000_state {
        struct dib8000_config cfg;

        struct i2c_device i2c;

        struct dibx000_i2c_master i2c_master;

        u16 wbd_ref;

        u8 current_band;
        u32 current_bandwidth;
        struct dibx000_agc_config *current_agc;
        u32 timf;
        u32 timf_default;

        u8 div_force_off:1;
        u8 div_state:1;
        u16 div_sync_wait;

        u8 agc_state;
        u8 differential_constellation;
        u8 diversity_onoff;

        s16 ber_monitored_layer;
        u16 gpio_dir;
        u16 gpio_val;

        u16 revision;
        u8 isdbt_cfg_loaded;
        enum frontend_tune_state tune_state;
        s32 status;

        struct dvb_frontend *fe[MAX_NUMBER_OF_FRONTENDS];

        /* for the I2C transfer */
        struct i2c_msg msg[2];
        u8 i2c_write_buffer[4];
        u8 i2c_read_buffer[2];
        struct mutex i2c_buffer_lock;
        u8 input_mode_mpeg;

        u16 tuner_enable;
        struct i2c_adapter dib8096p_tuner_adap;
        u16 current_demod_bw;

        u16 seg_mask;
        u16 seg_diff_mask;
        u16 mode;
        u8 layer_b_nb_seg;
        u8 layer_c_nb_seg;

        u8 channel_parameters_set;
        u16 autosearch_state;
        u16 found_nfft;
        u16 found_guard;
        u8 subchannel;
        u8 symbol_duration;
        unsigned long timeout;
        u8 longest_intlv_layer;
        u16 output_mode;

        /* for DVBv5 stats */
        s64 init_ucb;
        unsigned long per_jiffies_stats;
        unsigned long ber_jiffies_stats;
        unsigned long ber_jiffies_stats_layer[3];

#ifdef DIB8000_AGC_FREEZE
        u16 agc1_max;
        u16 agc1_min;
        u16 agc2_max;
        u16 agc2_min;
#endif
};

enum dib8000_power_mode {
        DIB8000_POWER_ALL = 0,
        DIB8000_POWER_INTERFACE_ONLY,
};

static u16 dib8000_i2c_read16(struct i2c_device *i2c, u16 reg)
{
        u16 ret;
        struct i2c_msg msg[2] = {
                {.addr = i2c->addr >> 1, .flags = 0, .len = 2},
                {.addr = i2c->addr >> 1, .flags = I2C_M_RD, .len = 2},
        };

        if (mutex_lock_interruptible(i2c->i2c_buffer_lock) < 0) {
                dprintk("could not acquire lock");
                return 0;
        }

        msg[0].buf    = i2c->i2c_write_buffer;
        msg[0].buf[0] = reg >> 8;
        msg[0].buf[1] = reg & 0xff;
        msg[1].buf    = i2c->i2c_read_buffer;

        if (i2c_transfer(i2c->adap, msg, 2) != 2)
                dprintk("i2c read error on %d", reg);

        ret = (msg[1].buf[0] << 8) | msg[1].buf[1];
        mutex_unlock(i2c->i2c_buffer_lock);
        return ret;
}

static u16 __dib8000_read_word(struct dib8000_state *state, u16 reg)
{
        u16 ret;

        state->i2c_write_buffer[0] = reg >> 8;
        state->i2c_write_buffer[1] = reg & 0xff;

        memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
        state->msg[0].addr = state->i2c.addr >> 1;
        state->msg[0].flags = 0;
        state->msg[0].buf = state->i2c_write_buffer;
        state->msg[0].len = 2;
        state->msg[1].addr = state->i2c.addr >> 1;
        state->msg[1].flags = I2C_M_RD;
        state->msg[1].buf = state->i2c_read_buffer;
        state->msg[1].len = 2;

        if (i2c_transfer(state->i2c.adap, state->msg, 2) != 2)
                dprintk("i2c read error on %d", reg);

        ret = (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];

        return ret;
}

static u16 dib8000_read_word(struct dib8000_state *state, u16 reg)
{
        u16 ret;

        if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
                dprintk("could not acquire lock");
                return 0;
        }

        ret = __dib8000_read_word(state, reg);

        mutex_unlock(&state->i2c_buffer_lock);

        return ret;
}

static u32 dib8000_read32(struct dib8000_state *state, u16 reg)
{
        u16 rw[2];

        if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
                dprintk("could not acquire lock");
                return 0;
        }

        rw[0] = __dib8000_read_word(state, reg + 0);
        rw[1] = __dib8000_read_word(state, reg + 1);

        mutex_unlock(&state->i2c_buffer_lock);

        return ((rw[0] << 16) | (rw[1]));
}

static int dib8000_i2c_write16(struct i2c_device *i2c, u16 reg, u16 val)
{
        struct i2c_msg msg = {.addr = i2c->addr >> 1, .flags = 0, .len = 4};
        int ret = 0;

        if (mutex_lock_interruptible(i2c->i2c_buffer_lock) < 0) {
                dprintk("could not acquire lock");
                return -EINVAL;
        }

        msg.buf    = i2c->i2c_write_buffer;
        msg.buf[0] = (reg >> 8) & 0xff;
        msg.buf[1] = reg & 0xff;
        msg.buf[2] = (val >> 8) & 0xff;
        msg.buf[3] = val & 0xff;

        ret = i2c_transfer(i2c->adap, &msg, 1) != 1 ? -EREMOTEIO : 0;
        mutex_unlock(i2c->i2c_buffer_lock);

        return ret;
}

static int dib8000_write_word(struct dib8000_state *state, u16 reg, u16 val)
{
        int ret;

        if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
                dprintk("could not acquire lock");
                return -EINVAL;
        }

        state->i2c_write_buffer[0] = (reg >> 8) & 0xff;
        state->i2c_write_buffer[1] = reg & 0xff;
        state->i2c_write_buffer[2] = (val >> 8) & 0xff;
        state->i2c_write_buffer[3] = val & 0xff;

        memset(&state->msg[0], 0, sizeof(struct i2c_msg));
        state->msg[0].addr = state->i2c.addr >> 1;
        state->msg[0].flags = 0;
        state->msg[0].buf = state->i2c_write_buffer;
        state->msg[0].len = 4;

        ret = (i2c_transfer(state->i2c.adap, state->msg, 1) != 1 ?
                        -EREMOTEIO : 0);
        mutex_unlock(&state->i2c_buffer_lock);

        return ret;
}

static const s16 coeff_2k_sb_1seg_dqpsk[8] = {
        (769 << 5) | 0x0a, (745 << 5) | 0x03, (595 << 5) | 0x0d, (769 << 5) | 0x0a, (920 << 5) | 0x09, (784 << 5) | 0x02, (519 << 5) | 0x0c,
                (920 << 5) | 0x09
};

static const s16 coeff_2k_sb_1seg[8] = {
        (692 << 5) | 0x0b, (683 << 5) | 0x01, (519 << 5) | 0x09, (692 << 5) | 0x0b, 0 | 0x1f, 0 | 0x1f, 0 | 0x1f, 0 | 0x1f
};

static const s16 coeff_2k_sb_3seg_0dqpsk_1dqpsk[8] = {
        (832 << 5) | 0x10, (912 << 5) | 0x05, (900 << 5) | 0x12, (832 << 5) | 0x10, (-931 << 5) | 0x0f, (912 << 5) | 0x04, (807 << 5) | 0x11,
                (-931 << 5) | 0x0f
};

static const s16 coeff_2k_sb_3seg_0dqpsk[8] = {
        (622 << 5) | 0x0c, (941 << 5) | 0x04, (796 << 5) | 0x10, (622 << 5) | 0x0c, (982 << 5) | 0x0c, (519 << 5) | 0x02, (572 << 5) | 0x0e,
                (982 << 5) | 0x0c
};

static const s16 coeff_2k_sb_3seg_1dqpsk[8] = {
        (699 << 5) | 0x14, (607 << 5) | 0x04, (944 << 5) | 0x13, (699 << 5) | 0x14, (-720 << 5) | 0x0d, (640 << 5) | 0x03, (866 << 5) | 0x12,
                (-720 << 5) | 0x0d
};

static const s16 coeff_2k_sb_3seg[8] = {
        (664 << 5) | 0x0c, (925 << 5) | 0x03, (937 << 5) | 0x10, (664 << 5) | 0x0c, (-610 << 5) | 0x0a, (697 << 5) | 0x01, (836 << 5) | 0x0e,
                (-610 << 5) | 0x0a
};

static const s16 coeff_4k_sb_1seg_dqpsk[8] = {
        (-955 << 5) | 0x0e, (687 << 5) | 0x04, (818 << 5) | 0x10, (-955 << 5) | 0x0e, (-922 << 5) | 0x0d, (750 << 5) | 0x03, (665 << 5) | 0x0f,
                (-922 << 5) | 0x0d
};

static const s16 coeff_4k_sb_1seg[8] = {
        (638 << 5) | 0x0d, (683 << 5) | 0x02, (638 << 5) | 0x0d, (638 << 5) | 0x0d, (-655 << 5) | 0x0a, (517 << 5) | 0x00, (698 << 5) | 0x0d,
                (-655 << 5) | 0x0a
};

static const s16 coeff_4k_sb_3seg_0dqpsk_1dqpsk[8] = {
        (-707 << 5) | 0x14, (910 << 5) | 0x06, (889 << 5) | 0x16, (-707 << 5) | 0x14, (-958 << 5) | 0x13, (993 << 5) | 0x05, (523 << 5) | 0x14,
                (-958 << 5) | 0x13
};

static const s16 coeff_4k_sb_3seg_0dqpsk[8] = {
        (-723 << 5) | 0x13, (910 << 5) | 0x05, (777 << 5) | 0x14, (-723 << 5) | 0x13, (-568 << 5) | 0x0f, (547 << 5) | 0x03, (696 << 5) | 0x12,
                (-568 << 5) | 0x0f
};

static const s16 coeff_4k_sb_3seg_1dqpsk[8] = {
        (-940 << 5) | 0x15, (607 << 5) | 0x05, (915 << 5) | 0x16, (-940 << 5) | 0x15, (-848 << 5) | 0x13, (683 << 5) | 0x04, (543 << 5) | 0x14,
                (-848 << 5) | 0x13
};

static const s16 coeff_4k_sb_3seg[8] = {
        (612 << 5) | 0x12, (910 << 5) | 0x04, (864 << 5) | 0x14, (612 << 5) | 0x12, (-869 << 5) | 0x13, (683 << 5) | 0x02, (869 << 5) | 0x12,
                (-869 << 5) | 0x13
};

static const s16 coeff_8k_sb_1seg_dqpsk[8] = {
        (-835 << 5) | 0x12, (684 << 5) | 0x05, (735 << 5) | 0x14, (-835 << 5) | 0x12, (-598 << 5) | 0x10, (781 << 5) | 0x04, (739 << 5) | 0x13,
                (-598 << 5) | 0x10
};

static const s16 coeff_8k_sb_1seg[8] = {
        (673 << 5) | 0x0f, (683 << 5) | 0x03, (808 << 5) | 0x12, (673 << 5) | 0x0f, (585 << 5) | 0x0f, (512 << 5) | 0x01, (780 << 5) | 0x0f,
                (585 << 5) | 0x0f
};

static const s16 coeff_8k_sb_3seg_0dqpsk_1dqpsk[8] = {
        (863 << 5) | 0x17, (930 << 5) | 0x07, (878 << 5) | 0x19, (863 << 5) | 0x17, (0 << 5) | 0x14, (521 << 5) | 0x05, (980 << 5) | 0x18,
                (0 << 5) | 0x14
};

static const s16 coeff_8k_sb_3seg_0dqpsk[8] = {
        (-924 << 5) | 0x17, (910 << 5) | 0x06, (774 << 5) | 0x17, (-924 << 5) | 0x17, (-877 << 5) | 0x15, (565 << 5) | 0x04, (553 << 5) | 0x15,
                (-877 << 5) | 0x15
};

static const s16 coeff_8k_sb_3seg_1dqpsk[8] = {
        (-921 << 5) | 0x19, (607 << 5) | 0x06, (881 << 5) | 0x19, (-921 << 5) | 0x19, (-921 << 5) | 0x14, (713 << 5) | 0x05, (1018 << 5) | 0x18,
                (-921 << 5) | 0x14
};

static const s16 coeff_8k_sb_3seg[8] = {
        (514 << 5) | 0x14, (910 << 5) | 0x05, (861 << 5) | 0x17, (514 << 5) | 0x14, (690 << 5) | 0x14, (683 << 5) | 0x03, (662 << 5) | 0x15,
                (690 << 5) | 0x14
};

static const s16 ana_fe_coeff_3seg[24] = {
        81, 80, 78, 74, 68, 61, 54, 45, 37, 28, 19, 11, 4, 1022, 1017, 1013, 1010, 1008, 1008, 1008, 1008, 1010, 1014, 1017
};

static const s16 ana_fe_coeff_1seg[24] = {
        249, 226, 164, 82, 5, 981, 970, 988, 1018, 20, 31, 26, 8, 1012, 1000, 1018, 1012, 8, 15, 14, 9, 3, 1017, 1003
};

static const s16 ana_fe_coeff_13seg[24] = {
        396, 305, 105, -51, -77, -12, 41, 31, -11, -30, -11, 14, 15, -2, -13, -7, 5, 8, 1, -6, -7, -3, 0, 1
};

static u16 fft_to_mode(struct dib8000_state *state)
{
        u16 mode;
        switch (state->fe[0]->dtv_property_cache.transmission_mode) {
        case TRANSMISSION_MODE_2K:
                mode = 1;
                break;
        case TRANSMISSION_MODE_4K:
                mode = 2;
                break;
        default:
        case TRANSMISSION_MODE_AUTO:
        case TRANSMISSION_MODE_8K:
                mode = 3;
                break;
        }
        return mode;
}

static void dib8000_set_acquisition_mode(struct dib8000_state *state)
{
        u16 nud = dib8000_read_word(state, 298);
        nud |= (1 << 3) | (1 << 0);
        dprintk("acquisition mode activated");
        dib8000_write_word(state, 298, nud);
}
static int dib8000_set_output_mode(struct dvb_frontend *fe, int mode)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 outreg, fifo_threshold, smo_mode, sram = 0x0205;    /* by default SDRAM deintlv is enabled */

        state->output_mode = mode;
        outreg = 0;
        fifo_threshold = 1792;
        smo_mode = (dib8000_read_word(state, 299) & 0x0050) | (1 << 1);

        dprintk("-I-    Setting output mode for demod %p to %d",
                        &state->fe[0], mode);

        switch (mode) {
        case OUTMODE_MPEG2_PAR_GATED_CLK:       // STBs with parallel gated clock
                outreg = (1 << 10);     /* 0x0400 */
                break;
        case OUTMODE_MPEG2_PAR_CONT_CLK:        // STBs with parallel continues clock
                outreg = (1 << 10) | (1 << 6);  /* 0x0440 */
                break;
        case OUTMODE_MPEG2_SERIAL:      // STBs with serial input
                outreg = (1 << 10) | (2 << 6) | (0 << 1);       /* 0x0482 */
                break;
        case OUTMODE_DIVERSITY:
                if (state->cfg.hostbus_diversity) {
                        outreg = (1 << 10) | (4 << 6);  /* 0x0500 */
                        sram &= 0xfdff;
                } else
                        sram |= 0x0c00;
                break;
        case OUTMODE_MPEG2_FIFO:        // e.g. USB feeding
                smo_mode |= (3 << 1);
                fifo_threshold = 512;
                outreg = (1 << 10) | (5 << 6);
                break;
        case OUTMODE_HIGH_Z:    // disable
                outreg = 0;
                break;

        case OUTMODE_ANALOG_ADC:
                outreg = (1 << 10) | (3 << 6);
                dib8000_set_acquisition_mode(state);
                break;

        default:
                dprintk("Unhandled output_mode passed to be set for demod %p",
                                &state->fe[0]);
                return -EINVAL;
        }

        if (state->cfg.output_mpeg2_in_188_bytes)
                smo_mode |= (1 << 5);

        dib8000_write_word(state, 299, smo_mode);
        dib8000_write_word(state, 300, fifo_threshold); /* synchronous fread */
        dib8000_write_word(state, 1286, outreg);
        dib8000_write_word(state, 1291, sram);

        return 0;
}

static int dib8000_set_diversity_in(struct dvb_frontend *fe, int onoff)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 tmp, sync_wait = dib8000_read_word(state, 273) & 0xfff0;

        dprintk("set diversity input to %i", onoff);
        if (!state->differential_constellation) {
                dib8000_write_word(state, 272, 1 << 9); //dvsy_off_lmod4 = 1
                dib8000_write_word(state, 273, sync_wait | (1 << 2) | 2);       // sync_enable = 1; comb_mode = 2
        } else {
                dib8000_write_word(state, 272, 0);      //dvsy_off_lmod4 = 0
                dib8000_write_word(state, 273, sync_wait);      // sync_enable = 0; comb_mode = 0
        }
        state->diversity_onoff = onoff;

        switch (onoff) {
        case 0:         /* only use the internal way - not the diversity input */
                dib8000_write_word(state, 270, 1);
                dib8000_write_word(state, 271, 0);
                break;
        case 1:         /* both ways */
                dib8000_write_word(state, 270, 6);
                dib8000_write_word(state, 271, 6);
                break;
        case 2:         /* only the diversity input */
                dib8000_write_word(state, 270, 0);
                dib8000_write_word(state, 271, 1);
                break;
        }

        if (state->revision == 0x8002) {
                tmp = dib8000_read_word(state, 903);
                dib8000_write_word(state, 903, tmp & ~(1 << 3));
                msleep(30);
                dib8000_write_word(state, 903, tmp | (1 << 3));
        }
        return 0;
}

static void dib8000_set_power_mode(struct dib8000_state *state, enum dib8000_power_mode mode)
{
        /* by default everything is going to be powered off */
        u16 reg_774 = 0x3fff, reg_775 = 0xffff, reg_776 = 0xffff,
                reg_900 = (dib8000_read_word(state, 900) & 0xfffc) | 0x3,
                reg_1280;

        if (state->revision != 0x8090)
                reg_1280 = (dib8000_read_word(state, 1280) & 0x00ff) | 0xff00;
        else
                reg_1280 = (dib8000_read_word(state, 1280) & 0x707f) | 0x8f80;

        /* now, depending on the requested mode, we power on */
        switch (mode) {
                /* power up everything in the demod */
        case DIB8000_POWER_ALL:
                reg_774 = 0x0000;
                reg_775 = 0x0000;
                reg_776 = 0x0000;
                reg_900 &= 0xfffc;
                if (state->revision != 0x8090)
                        reg_1280 &= 0x00ff;
                else
                        reg_1280 &= 0x707f;
                break;
        case DIB8000_POWER_INTERFACE_ONLY:
                if (state->revision != 0x8090)
                        reg_1280 &= 0x00ff;
                else
                        reg_1280 &= 0xfa7b;
                break;
        }

        dprintk("powermode : 774 : %x ; 775 : %x; 776 : %x ; 900 : %x; 1280 : %x", reg_774, reg_775, reg_776, reg_900, reg_1280);
        dib8000_write_word(state, 774, reg_774);
        dib8000_write_word(state, 775, reg_775);
        dib8000_write_word(state, 776, reg_776);
        dib8000_write_word(state, 900, reg_900);
        dib8000_write_word(state, 1280, reg_1280);
}

static int dib8000_set_adc_state(struct dib8000_state *state, enum dibx000_adc_states no)
{
        int ret = 0;
        u16 reg, reg_907 = dib8000_read_word(state, 907);
        u16 reg_908 = dib8000_read_word(state, 908);

        switch (no) {
        case DIBX000_SLOW_ADC_ON:
                if (state->revision != 0x8090) {
                        reg_908 |= (1 << 1) | (1 << 0);
                        ret |= dib8000_write_word(state, 908, reg_908);
                        reg_908 &= ~(1 << 1);
                } else {
                        reg = dib8000_read_word(state, 1925);
                        /* en_slowAdc = 1 & reset_sladc = 1 */
                        dib8000_write_word(state, 1925, reg |
                                        (1<<4) | (1<<2));

                        /* read acces to make it works... strange ... */
                        reg = dib8000_read_word(state, 1925);
                        msleep(20);
                        /* en_slowAdc = 1 & reset_sladc = 0 */
                        dib8000_write_word(state, 1925, reg & ~(1<<4));

                        reg = dib8000_read_word(state, 921) & ~((0x3 << 14)
                                        | (0x3 << 12));
                        /* ref = Vin1 => Vbg ; sel = Vin0 or Vin3 ;
                           (Vin2 = Vcm) */
                        dib8000_write_word(state, 921, reg | (1 << 14)
                                        | (3 << 12));
                }
                break;

        case DIBX000_SLOW_ADC_OFF:
                if (state->revision == 0x8090) {
                        reg = dib8000_read_word(state, 1925);
                        /* reset_sladc = 1 en_slowAdc = 0 */
                        dib8000_write_word(state, 1925,
                                        (reg & ~(1<<2)) | (1<<4));
                }
                reg_908 |= (1 << 1) | (1 << 0);
                break;

        case DIBX000_ADC_ON:
                reg_907 &= 0x0fff;
                reg_908 &= 0x0003;
                break;

        case DIBX000_ADC_OFF:   // leave the VBG voltage on
                reg_907 = (1 << 13) | (1 << 12);
                reg_908 = (1 << 6) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 1);
                break;

        case DIBX000_VBG_ENABLE:
                reg_907 &= ~(1 << 15);
                break;

        case DIBX000_VBG_DISABLE:
                reg_907 |= (1 << 15);
                break;

        default:
                break;
        }

        ret |= dib8000_write_word(state, 907, reg_907);
        ret |= dib8000_write_word(state, 908, reg_908);

        return ret;
}

static int dib8000_set_bandwidth(struct dvb_frontend *fe, u32 bw)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u32 timf;

        if (bw == 0)
                bw = 6000;

        if (state->timf == 0) {
                dprintk("using default timf");
                timf = state->timf_default;
        } else {
                dprintk("using updated timf");
                timf = state->timf;
        }

        dib8000_write_word(state, 29, (u16) ((timf >> 16) & 0xffff));
        dib8000_write_word(state, 30, (u16) ((timf) & 0xffff));

        return 0;
}

static int dib8000_sad_calib(struct dib8000_state *state)
{
        u8 sad_sel = 3;

        if (state->revision == 0x8090) {
                dib8000_write_word(state, 922, (sad_sel << 2));
                dib8000_write_word(state, 923, 2048);

                dib8000_write_word(state, 922, (sad_sel << 2) | 0x1);
                dib8000_write_word(state, 922, (sad_sel << 2));
        } else {
                /* internal */
                dib8000_write_word(state, 923, (0 << 1) | (0 << 0));
                dib8000_write_word(state, 924, 776);

                /* do the calibration */
                dib8000_write_word(state, 923, (1 << 0));
                dib8000_write_word(state, 923, (0 << 0));
        }

        msleep(1);
        return 0;
}

static int dib8000_set_wbd_ref(struct dvb_frontend *fe, u16 value)
{
        struct dib8000_state *state = fe->demodulator_priv;
        if (value > 4095)
                value = 4095;
        state->wbd_ref = value;
        return dib8000_write_word(state, 106, value);
}

static void dib8000_reset_pll_common(struct dib8000_state *state, const struct dibx000_bandwidth_config *bw)
{
        dprintk("ifreq: %d %x, inversion: %d", bw->ifreq, bw->ifreq, bw->ifreq >> 25);
        if (state->revision != 0x8090) {
                dib8000_write_word(state, 23,
                                (u16) (((bw->internal * 1000) >> 16) & 0xffff));
                dib8000_write_word(state, 24,
                                (u16) ((bw->internal * 1000) & 0xffff));
        } else {
                dib8000_write_word(state, 23, (u16) (((bw->internal / 2 * 1000) >> 16) & 0xffff));
                dib8000_write_word(state, 24,
                                (u16) ((bw->internal  / 2 * 1000) & 0xffff));
        }
        dib8000_write_word(state, 27, (u16) ((bw->ifreq >> 16) & 0x01ff));
        dib8000_write_word(state, 28, (u16) (bw->ifreq & 0xffff));
        dib8000_write_word(state, 26, (u16) ((bw->ifreq >> 25) & 0x0003));

        if (state->revision != 0x8090)
                dib8000_write_word(state, 922, bw->sad_cfg);
}

static void dib8000_reset_pll(struct dib8000_state *state)
{
        const struct dibx000_bandwidth_config *pll = state->cfg.pll;
        u16 clk_cfg1, reg;

        if (state->revision != 0x8090) {
                dib8000_write_word(state, 901,
                                (pll->pll_prediv << 8) | (pll->pll_ratio << 0));

                clk_cfg1 = (1 << 10) | (0 << 9) | (pll->IO_CLK_en_core << 8) |
                        (pll->bypclk_div << 5) | (pll->enable_refdiv << 4) |
                        (1 << 3) | (pll->pll_range << 1) |
                        (pll->pll_reset << 0);

                dib8000_write_word(state, 902, clk_cfg1);
                clk_cfg1 = (clk_cfg1 & 0xfff7) | (pll->pll_bypass << 3);
                dib8000_write_word(state, 902, clk_cfg1);

                dprintk("clk_cfg1: 0x%04x", clk_cfg1);

                /* smpl_cfg: P_refclksel=2, P_ensmplsel=1 nodivsmpl=1 */
                if (state->cfg.pll->ADClkSrc == 0)
                        dib8000_write_word(state, 904,
                                        (0 << 15) | (0 << 12) | (0 << 10) |
                                        (pll->modulo << 8) |
                                        (pll->ADClkSrc << 7) | (0 << 1));
                else if (state->cfg.refclksel != 0)
                        dib8000_write_word(state, 904, (0 << 15) | (1 << 12) |
                                        ((state->cfg.refclksel & 0x3) << 10) |
                                        (pll->modulo << 8) |
                                        (pll->ADClkSrc << 7) | (0 << 1));
                else
                        dib8000_write_word(state, 904, (0 << 15) | (1 << 12) |
                                        (3 << 10) | (pll->modulo << 8) |
                                        (pll->ADClkSrc << 7) | (0 << 1));
        } else {
                dib8000_write_word(state, 1856, (!pll->pll_reset<<13) |
                                (pll->pll_range<<12) | (pll->pll_ratio<<6) |
                                (pll->pll_prediv));

                reg = dib8000_read_word(state, 1857);
                dib8000_write_word(state, 1857, reg|(!pll->pll_bypass<<15));

                reg = dib8000_read_word(state, 1858); /* Force clk out pll /2 */
                dib8000_write_word(state, 1858, reg | 1);

                dib8000_write_word(state, 904, (pll->modulo << 8));
        }

        dib8000_reset_pll_common(state, pll);
}

static int dib8000_update_pll(struct dvb_frontend *fe,
                struct dibx000_bandwidth_config *pll, u32 bw, u8 ratio)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 reg_1857, reg_1856 = dib8000_read_word(state, 1856);
        u8 loopdiv, prediv, oldprediv = state->cfg.pll->pll_prediv ;
        u32 internal, xtal;

        /* get back old values */
        prediv = reg_1856 & 0x3f;
        loopdiv = (reg_1856 >> 6) & 0x3f;

        if ((pll == NULL) || (pll->pll_prediv == prediv &&
                                pll->pll_ratio == loopdiv))
                return -EINVAL;

        dprintk("Updating pll (prediv: old =  %d new = %d ; loopdiv : old = %d new = %d)", prediv, pll->pll_prediv, loopdiv, pll->pll_ratio);
        if (state->revision == 0x8090) {
                reg_1856 &= 0xf000;
                reg_1857 = dib8000_read_word(state, 1857);
                /* disable PLL */
                dib8000_write_word(state, 1857, reg_1857 & ~(1 << 15));

                dib8000_write_word(state, 1856, reg_1856 |
                                ((pll->pll_ratio & 0x3f) << 6) |
                                (pll->pll_prediv & 0x3f));

                /* write new system clk into P_sec_len */
                internal = dib8000_read32(state, 23) / 1000;
                dprintk("Old Internal = %d", internal);
                xtal = 2 * (internal / loopdiv) * prediv;
                internal = 1000 * (xtal/pll->pll_prediv) * pll->pll_ratio;
                dprintk("Xtal = %d , New Fmem = %d New Fdemod = %d, New Fsampling = %d", xtal, internal/1000, internal/2000, internal/8000);
                dprintk("New Internal = %d", internal);

                dib8000_write_word(state, 23,
                                (u16) (((internal / 2) >> 16) & 0xffff));
                dib8000_write_word(state, 24, (u16) ((internal / 2) & 0xffff));
                /* enable PLL */
                dib8000_write_word(state, 1857, reg_1857 | (1 << 15));

                while (((dib8000_read_word(state, 1856)>>15)&0x1) != 1)
                        dprintk("Waiting for PLL to lock");

                /* verify */
                reg_1856 = dib8000_read_word(state, 1856);
                dprintk("PLL Updated with prediv = %d and loopdiv = %d",
                                reg_1856&0x3f, (reg_1856>>6)&0x3f);
        } else {
                if (bw != state->current_demod_bw) {
                        /** Bandwidth change => force PLL update **/
                        dprintk("PLL: Bandwidth Change %d MHz -> %d MHz (prediv: %d->%d)", state->current_demod_bw / 1000, bw / 1000, oldprediv, state->cfg.pll->pll_prediv);

                        if (state->cfg.pll->pll_prediv != oldprediv) {
                                /** Full PLL change only if prediv is changed **/

                                /** full update => bypass and reconfigure **/
                                dprintk("PLL: New Setting for %d MHz Bandwidth (prediv: %d, ratio: %d)", bw/1000, state->cfg.pll->pll_prediv, state->cfg.pll->pll_ratio);
                                dib8000_write_word(state, 902, dib8000_read_word(state, 902) | (1<<3)); /* bypass PLL */
                                dib8000_reset_pll(state);
                                dib8000_write_word(state, 898, 0x0004); /* sad */
                        } else
                                ratio = state->cfg.pll->pll_ratio;

                        state->current_demod_bw = bw;
                }

                if (ratio != 0) {
                        /** ratio update => only change ratio **/
                        dprintk("PLL: Update ratio (prediv: %d, ratio: %d)", state->cfg.pll->pll_prediv, ratio);
                        dib8000_write_word(state, 901, (state->cfg.pll->pll_prediv << 8) | (ratio << 0)); /* only the PLL ratio is updated. */
                }
        }

        return 0;
}

static int dib8000_reset_gpio(struct dib8000_state *st)
{
        /* reset the GPIOs */
        dib8000_write_word(st, 1029, st->cfg.gpio_dir);
        dib8000_write_word(st, 1030, st->cfg.gpio_val);

        /* TODO 782 is P_gpio_od */

        dib8000_write_word(st, 1032, st->cfg.gpio_pwm_pos);

        dib8000_write_word(st, 1037, st->cfg.pwm_freq_div);
        return 0;
}

static int dib8000_cfg_gpio(struct dib8000_state *st, u8 num, u8 dir, u8 val)
{
        st->cfg.gpio_dir = dib8000_read_word(st, 1029);
        st->cfg.gpio_dir &= ~(1 << num);        /* reset the direction bit */
        st->cfg.gpio_dir |= (dir & 0x1) << num; /* set the new direction */
        dib8000_write_word(st, 1029, st->cfg.gpio_dir);

        st->cfg.gpio_val = dib8000_read_word(st, 1030);
        st->cfg.gpio_val &= ~(1 << num);        /* reset the direction bit */
        st->cfg.gpio_val |= (val & 0x01) << num;        /* set the new value */
        dib8000_write_word(st, 1030, st->cfg.gpio_val);

        dprintk("gpio dir: %x: gpio val: %x", st->cfg.gpio_dir, st->cfg.gpio_val);

        return 0;
}

static int dib8000_set_gpio(struct dvb_frontend *fe, u8 num, u8 dir, u8 val)
{
        struct dib8000_state *state = fe->demodulator_priv;
        return dib8000_cfg_gpio(state, num, dir, val);
}

static const u16 dib8000_defaults[] = {
        /* auto search configuration - lock0 by default waiting
         * for cpil_lock; lock1 cpil_lock; lock2 tmcc_sync_lock */
        3, 7,
        0x0004,
        0x0400,
        0x0814,

        12, 11,
        0x001b,
        0x7740,
        0x005b,
        0x8d80,
        0x01c9,
        0xc380,
        0x0000,
        0x0080,
        0x0000,
        0x0090,
        0x0001,
        0xd4c0,

        /*1, 32,
                0x6680 // P_corm_thres Lock algorithms configuration */

        11, 80,                 /* set ADC level to -16 */
        (1 << 13) - 825 - 117,
        (1 << 13) - 837 - 117,
        (1 << 13) - 811 - 117,
        (1 << 13) - 766 - 117,
        (1 << 13) - 737 - 117,
        (1 << 13) - 693 - 117,
        (1 << 13) - 648 - 117,
        (1 << 13) - 619 - 117,
        (1 << 13) - 575 - 117,
        (1 << 13) - 531 - 117,
        (1 << 13) - 501 - 117,

        4, 108,
        0,
        0,
        0,
        0,

        1, 175,
        0x0410,
        1, 179,
        8192,                   // P_fft_nb_to_cut

        6, 181,
        0x2800,                 // P_coff_corthres_ ( 2k 4k 8k ) 0x2800
        0x2800,
        0x2800,
        0x2800,                 // P_coff_cpilthres_ ( 2k 4k 8k ) 0x2800
        0x2800,
        0x2800,

        2, 193,
        0x0666,                 // P_pha3_thres
        0x0000,                 // P_cti_use_cpe, P_cti_use_prog

        2, 205,
        0x200f,                 // P_cspu_regul, P_cspu_win_cut
        0x000f,                 // P_des_shift_work

        5, 215,
        0x023d,                 // P_adp_regul_cnt
        0x00a4,                 // P_adp_noise_cnt
        0x00a4,                 // P_adp_regul_ext
        0x7ff0,                 // P_adp_noise_ext
        0x3ccc,                 // P_adp_fil

        1, 230,
        0x0000,                 // P_2d_byp_ti_num

        1, 263,
        0x800,                  //P_equal_thres_wgn

        1, 268,
        (2 << 9) | 39,          // P_equal_ctrl_synchro, P_equal_speedmode

        1, 270,
        0x0001,                 // P_div_lock0_wait
        1, 285,
        0x0020,                 //p_fec_
        1, 299,
        0x0062,                 /* P_smo_mode, P_smo_rs_discard, P_smo_fifo_flush, P_smo_pid_parse, P_smo_error_discard */

        1, 338,
        (1 << 12) |             // P_ctrl_corm_thres4pre_freq_inh=1
                (1 << 10) |
                (0 << 9) |              /* P_ctrl_pre_freq_inh=0 */
                (3 << 5) |              /* P_ctrl_pre_freq_step=3 */
                (1 << 0),               /* P_pre_freq_win_len=1 */

        0,
};

static u16 dib8000_identify(struct i2c_device *client)
{
        u16 value;

        //because of glitches sometimes
        value = dib8000_i2c_read16(client, 896);

        if ((value = dib8000_i2c_read16(client, 896)) != 0x01b3) {
                dprintk("wrong Vendor ID (read=0x%x)", value);
                return 0;
        }

        value = dib8000_i2c_read16(client, 897);
        if (value != 0x8000 && value != 0x8001 &&
                        value != 0x8002 && value != 0x8090) {
                dprintk("wrong Device ID (%x)", value);
                return 0;
        }

        switch (value) {
        case 0x8000:
                dprintk("found DiB8000A");
                break;
        case 0x8001:
                dprintk("found DiB8000B");
                break;
        case 0x8002:
                dprintk("found DiB8000C");
                break;
        case 0x8090:
                dprintk("found DiB8096P");
                break;
        }
        return value;
}

static int dib8000_read_unc_blocks(struct dvb_frontend *fe, u32 *unc);

static void dib8000_reset_stats(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        u32 ucb;

        memset(&c->strength, 0, sizeof(c->strength));
        memset(&c->cnr, 0, sizeof(c->cnr));
        memset(&c->post_bit_error, 0, sizeof(c->post_bit_error));
        memset(&c->post_bit_count, 0, sizeof(c->post_bit_count));

        memset(&c->block_error, 0, sizeof(c->block_error));

        c->strength.len = 1;
        c->cnr.len = 1;
        c->block_error.len = 1;
        c->block_count.len = 1;
        c->post_bit_error.len = 1;
        c->post_bit_count.len = 1;

        c->strength.stat[0].scale = FE_SCALE_DECIBEL;
        c->strength.stat[0].uvalue = 0;

        c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;

        dib8000_read_unc_blocks(fe, &ucb);

        state->init_ucb = -ucb;
        state->ber_jiffies_stats = 0;
        state->per_jiffies_stats = 0;
        memset(&state->ber_jiffies_stats_layer, 0,
               sizeof(state->ber_jiffies_stats_layer));
}

static int dib8000_reset(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;

        if ((state->revision = dib8000_identify(&state->i2c)) == 0)
                return -EINVAL;

        /* sram lead in, rdy */
        if (state->revision != 0x8090)
                dib8000_write_word(state, 1287, 0x0003);

        if (state->revision == 0x8000)
                dprintk("error : dib8000 MA not supported");

        dibx000_reset_i2c_master(&state->i2c_master);

        dib8000_set_power_mode(state, DIB8000_POWER_ALL);

        /* always leave the VBG voltage on - it consumes almost nothing but takes a long time to start */
        dib8000_set_adc_state(state, DIBX000_ADC_OFF);

        /* restart all parts */
        dib8000_write_word(state, 770, 0xffff);
        dib8000_write_word(state, 771, 0xffff);
        dib8000_write_word(state, 772, 0xfffc);
        dib8000_write_word(state, 898, 0x000c); /* restart sad */
        if (state->revision == 0x8090)
                dib8000_write_word(state, 1280, 0x0045);
        else
                dib8000_write_word(state, 1280, 0x004d);
        dib8000_write_word(state, 1281, 0x000c);

        dib8000_write_word(state, 770, 0x0000);
        dib8000_write_word(state, 771, 0x0000);
        dib8000_write_word(state, 772, 0x0000);
        dib8000_write_word(state, 898, 0x0004); // sad
        dib8000_write_word(state, 1280, 0x0000);
        dib8000_write_word(state, 1281, 0x0000);

        /* drives */
        if (state->revision != 0x8090) {
                if (state->cfg.drives)
                        dib8000_write_word(state, 906, state->cfg.drives);
                else {
                        dprintk("using standard PAD-drive-settings, please adjust settings in config-struct to be optimal.");
                        /* min drive SDRAM - not optimal - adjust */
                        dib8000_write_word(state, 906, 0x2d98);
                }
        }

        dib8000_reset_pll(state);
        if (state->revision != 0x8090)
                dib8000_write_word(state, 898, 0x0004);

        if (dib8000_reset_gpio(state) != 0)
                dprintk("GPIO reset was not successful.");

        if ((state->revision != 0x8090) &&
                        (dib8000_set_output_mode(fe, OUTMODE_HIGH_Z) != 0))
                dprintk("OUTPUT_MODE could not be resetted.");

        state->current_agc = NULL;

        // P_iqc_alpha_pha, P_iqc_alpha_amp, P_iqc_dcc_alpha, ...
        /* P_iqc_ca2 = 0; P_iqc_impnc_on = 0; P_iqc_mode = 0; */
        if (state->cfg.pll->ifreq == 0)
                dib8000_write_word(state, 40, 0x0755);  /* P_iqc_corr_inh = 0 enable IQcorr block */
        else
                dib8000_write_word(state, 40, 0x1f55);  /* P_iqc_corr_inh = 1 disable IQcorr block */

        {
                u16 l = 0, r;
                const u16 *n;
                n = dib8000_defaults;
                l = *n++;
                while (l) {
                        r = *n++;
                        do {
                                dib8000_write_word(state, r, *n++);
                                r++;
                        } while (--l);
                        l = *n++;
                }
        }

        state->isdbt_cfg_loaded = 0;

        //div_cfg override for special configs
        if ((state->revision != 8090) && (state->cfg.div_cfg != 0))
                dib8000_write_word(state, 903, state->cfg.div_cfg);

        /* unforce divstr regardless whether i2c enumeration was done or not */
        dib8000_write_word(state, 1285, dib8000_read_word(state, 1285) & ~(1 << 1));

        dib8000_set_bandwidth(fe, 6000);

        dib8000_set_adc_state(state, DIBX000_SLOW_ADC_ON);
        dib8000_sad_calib(state);
        if (state->revision != 0x8090)
                dib8000_set_adc_state(state, DIBX000_SLOW_ADC_OFF);

        /* ber_rs_len = 3 */
        dib8000_write_word(state, 285, (dib8000_read_word(state, 285) & ~0x60) | (3 << 5));

        dib8000_set_power_mode(state, DIB8000_POWER_INTERFACE_ONLY);

        dib8000_reset_stats(fe);

        return 0;
}

static void dib8000_restart_agc(struct dib8000_state *state)
{
        // P_restart_iqc & P_restart_agc
        dib8000_write_word(state, 770, 0x0a00);
        dib8000_write_word(state, 770, 0x0000);
}

static int dib8000_update_lna(struct dib8000_state *state)
{
        u16 dyn_gain;

        if (state->cfg.update_lna) {
                // read dyn_gain here (because it is demod-dependent and not tuner)
                dyn_gain = dib8000_read_word(state, 390);

                if (state->cfg.update_lna(state->fe[0], dyn_gain)) {
                        dib8000_restart_agc(state);
                        return 1;
                }
        }
        return 0;
}

static int dib8000_set_agc_config(struct dib8000_state *state, u8 band)
{
        struct dibx000_agc_config *agc = NULL;
        int i;
        u16 reg;

        if (state->current_band == band && state->current_agc != NULL)
                return 0;
        state->current_band = band;

        for (i = 0; i < state->cfg.agc_config_count; i++)
                if (state->cfg.agc[i].band_caps & band) {
                        agc = &state->cfg.agc[i];
                        break;
                }

        if (agc == NULL) {
                dprintk("no valid AGC configuration found for band 0x%02x", band);
                return -EINVAL;
        }

        state->current_agc = agc;

        /* AGC */
        dib8000_write_word(state, 76, agc->setup);
        dib8000_write_word(state, 77, agc->inv_gain);
        dib8000_write_word(state, 78, agc->time_stabiliz);
        dib8000_write_word(state, 101, (agc->alpha_level << 12) | agc->thlock);

        // Demod AGC loop configuration
        dib8000_write_word(state, 102, (agc->alpha_mant << 5) | agc->alpha_exp);
        dib8000_write_word(state, 103, (agc->beta_mant << 6) | agc->beta_exp);

        dprintk("WBD: ref: %d, sel: %d, active: %d, alpha: %d",
                state->wbd_ref != 0 ? state->wbd_ref : agc->wbd_ref, agc->wbd_sel, !agc->perform_agc_softsplit, agc->wbd_sel);

        /* AGC continued */
        if (state->wbd_ref != 0)
                dib8000_write_word(state, 106, state->wbd_ref);
        else                    // use default
                dib8000_write_word(state, 106, agc->wbd_ref);

        if (state->revision == 0x8090) {
                reg = dib8000_read_word(state, 922) & (0x3 << 2);
                dib8000_write_word(state, 922, reg | (agc->wbd_sel << 2));
        }

        dib8000_write_word(state, 107, (agc->wbd_alpha << 9) | (agc->perform_agc_softsplit << 8));
        dib8000_write_word(state, 108, agc->agc1_max);
        dib8000_write_word(state, 109, agc->agc1_min);
        dib8000_write_word(state, 110, agc->agc2_max);
        dib8000_write_word(state, 111, agc->agc2_min);
        dib8000_write_word(state, 112, (agc->agc1_pt1 << 8) | agc->agc1_pt2);
        dib8000_write_word(state, 113, (agc->agc1_slope1 << 8) | agc->agc1_slope2);
        dib8000_write_word(state, 114, (agc->agc2_pt1 << 8) | agc->agc2_pt2);
        dib8000_write_word(state, 115, (agc->agc2_slope1 << 8) | agc->agc2_slope2);

        dib8000_write_word(state, 75, agc->agc1_pt3);
        if (state->revision != 0x8090)
                dib8000_write_word(state, 923,
                                (dib8000_read_word(state, 923) & 0xffe3) |
                                (agc->wbd_inv << 4) | (agc->wbd_sel << 2));

        return 0;
}

static void dib8000_pwm_agc_reset(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        dib8000_set_adc_state(state, DIBX000_ADC_ON);
        dib8000_set_agc_config(state, (unsigned char)(BAND_OF_FREQUENCY(fe->dtv_property_cache.frequency / 1000)));
}

static int dib8000_agc_soft_split(struct dib8000_state *state)
{
        u16 agc, split_offset;

        if (!state->current_agc || !state->current_agc->perform_agc_softsplit || state->current_agc->split.max == 0)
                return 0;

        // n_agc_global
        agc = dib8000_read_word(state, 390);

        if (agc > state->current_agc->split.min_thres)
                split_offset = state->current_agc->split.min;
        else if (agc < state->current_agc->split.max_thres)
                split_offset = state->current_agc->split.max;
        else
                split_offset = state->current_agc->split.max *
                        (agc - state->current_agc->split.min_thres) /
                        (state->current_agc->split.max_thres - state->current_agc->split.min_thres);

        dprintk("AGC split_offset: %d", split_offset);

        // P_agc_force_split and P_agc_split_offset
        dib8000_write_word(state, 107, (dib8000_read_word(state, 107) & 0xff00) | split_offset);
        return 5000;
}

static int dib8000_agc_startup(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        enum frontend_tune_state *tune_state = &state->tune_state;
        int ret = 0;
        u16 reg;
        u32 upd_demod_gain_period = 0x8000;

        switch (*tune_state) {
        case CT_AGC_START:
                // set power-up level: interf+analog+AGC

                if (state->revision != 0x8090)
                        dib8000_set_adc_state(state, DIBX000_ADC_ON);
                else {
                        dib8000_set_power_mode(state, DIB8000_POWER_ALL);

                        reg = dib8000_read_word(state, 1947)&0xff00;
                        dib8000_write_word(state, 1946,
                                        upd_demod_gain_period & 0xFFFF);
                        /* bit 14 = enDemodGain */
                        dib8000_write_word(state, 1947, reg | (1<<14) |
                                        ((upd_demod_gain_period >> 16) & 0xFF));

                        /* enable adc i & q */
                        reg = dib8000_read_word(state, 1920);
                        dib8000_write_word(state, 1920, (reg | 0x3) &
                                        (~(1 << 7)));
                }

                if (dib8000_set_agc_config(state, (unsigned char)(BAND_OF_FREQUENCY(fe->dtv_property_cache.frequency / 1000))) != 0) {
                        *tune_state = CT_AGC_STOP;
                        state->status = FE_STATUS_TUNE_FAILED;
                        break;
                }

                ret = 70;
                *tune_state = CT_AGC_STEP_0;
                break;

        case CT_AGC_STEP_0:
                //AGC initialization
                if (state->cfg.agc_control)
                        state->cfg.agc_control(fe, 1);

                dib8000_restart_agc(state);

                // wait AGC rough lock time
                ret = 50;
                *tune_state = CT_AGC_STEP_1;
                break;

        case CT_AGC_STEP_1:
                // wait AGC accurate lock time
                ret = 70;

                if (dib8000_update_lna(state))
                        // wait only AGC rough lock time
                        ret = 50;
                else
                        *tune_state = CT_AGC_STEP_2;
                break;

        case CT_AGC_STEP_2:
                dib8000_agc_soft_split(state);

                if (state->cfg.agc_control)
                        state->cfg.agc_control(fe, 0);

                *tune_state = CT_AGC_STOP;
                break;
        default:
                ret = dib8000_agc_soft_split(state);
                break;
        }
        return ret;

}

static void dib8096p_host_bus_drive(struct dib8000_state *state, u8 drive)
{
        u16 reg;

        drive &= 0x7;

        /* drive host bus 2, 3, 4 */
        reg = dib8000_read_word(state, 1798) &
                ~(0x7 | (0x7 << 6) | (0x7 << 12));
        reg |= (drive<<12) | (drive<<6) | drive;
        dib8000_write_word(state, 1798, reg);

        /* drive host bus 5,6 */
        reg = dib8000_read_word(state, 1799) & ~((0x7 << 2) | (0x7 << 8));
        reg |= (drive<<8) | (drive<<2);
        dib8000_write_word(state, 1799, reg);

        /* drive host bus 7, 8, 9 */
        reg = dib8000_read_word(state, 1800) &
                ~(0x7 | (0x7 << 6) | (0x7 << 12));
        reg |= (drive<<12) | (drive<<6) | drive;
        dib8000_write_word(state, 1800, reg);

        /* drive host bus 10, 11 */
        reg = dib8000_read_word(state, 1801) & ~((0x7 << 2) | (0x7 << 8));
        reg |= (drive<<8) | (drive<<2);
        dib8000_write_word(state, 1801, reg);

        /* drive host bus 12, 13, 14 */
        reg = dib8000_read_word(state, 1802) &
                ~(0x7 | (0x7 << 6) | (0x7 << 12));
        reg |= (drive<<12) | (drive<<6) | drive;
        dib8000_write_word(state, 1802, reg);
}

static u32 dib8096p_calcSyncFreq(u32 P_Kin, u32 P_Kout,
                u32 insertExtSynchro, u32 syncSize)
{
        u32 quantif = 3;
        u32 nom = (insertExtSynchro * P_Kin+syncSize);
        u32 denom = P_Kout;
        u32 syncFreq = ((nom << quantif) / denom);

        if ((syncFreq & ((1 << quantif) - 1)) != 0)
                syncFreq = (syncFreq >> quantif) + 1;
        else
                syncFreq = (syncFreq >> quantif);

        if (syncFreq != 0)
                syncFreq = syncFreq - 1;

        return syncFreq;
}

static void dib8096p_cfg_DibTx(struct dib8000_state *state, u32 P_Kin,
                u32 P_Kout, u32 insertExtSynchro, u32 synchroMode,
                u32 syncWord, u32 syncSize)
{
        dprintk("Configure DibStream Tx");

        dib8000_write_word(state, 1615, 1);
        dib8000_write_word(state, 1603, P_Kin);
        dib8000_write_word(state, 1605, P_Kout);
        dib8000_write_word(state, 1606, insertExtSynchro);
        dib8000_write_word(state, 1608, synchroMode);
        dib8000_write_word(state, 1609, (syncWord >> 16) & 0xffff);
        dib8000_write_word(state, 1610, syncWord & 0xffff);
        dib8000_write_word(state, 1612, syncSize);
        dib8000_write_word(state, 1615, 0);
}

static void dib8096p_cfg_DibRx(struct dib8000_state *state, u32 P_Kin,
                u32 P_Kout, u32 synchroMode, u32 insertExtSynchro,
                u32 syncWord, u32 syncSize, u32 dataOutRate)
{
        u32 syncFreq;

        dprintk("Configure DibStream Rx synchroMode = %d", synchroMode);

        if ((P_Kin != 0) && (P_Kout != 0)) {
                syncFreq = dib8096p_calcSyncFreq(P_Kin, P_Kout,
                                insertExtSynchro, syncSize);
                dib8000_write_word(state, 1542, syncFreq);
        }

        dib8000_write_word(state, 1554, 1);
        dib8000_write_word(state, 1536, P_Kin);
        dib8000_write_word(state, 1537, P_Kout);
        dib8000_write_word(state, 1539, synchroMode);
        dib8000_write_word(state, 1540, (syncWord >> 16) & 0xffff);
        dib8000_write_word(state, 1541, syncWord & 0xffff);
        dib8000_write_word(state, 1543, syncSize);
        dib8000_write_word(state, 1544, dataOutRate);
        dib8000_write_word(state, 1554, 0);
}

static void dib8096p_enMpegMux(struct dib8000_state *state, int onoff)
{
        u16 reg_1287;

        reg_1287 = dib8000_read_word(state, 1287);

        switch (onoff) {
        case 1:
                        reg_1287 &= ~(1 << 8);
                        break;
        case 0:
                        reg_1287 |= (1 << 8);
                        break;
        }

        dib8000_write_word(state, 1287, reg_1287);
}

static void dib8096p_configMpegMux(struct dib8000_state *state,
                u16 pulseWidth, u16 enSerialMode, u16 enSerialClkDiv2)
{
        u16 reg_1287;

        dprintk("Enable Mpeg mux");

        dib8096p_enMpegMux(state, 0);

        /* If the input mode is MPEG do not divide the serial clock */
        if ((enSerialMode == 1) && (state->input_mode_mpeg == 1))
                enSerialClkDiv2 = 0;

        reg_1287 = ((pulseWidth & 0x1f) << 3) |
                ((enSerialMode & 0x1) << 2) | (enSerialClkDiv2 & 0x1);
        dib8000_write_word(state, 1287, reg_1287);

        dib8096p_enMpegMux(state, 1);
}

static void dib8096p_setDibTxMux(struct dib8000_state *state, int mode)
{
        u16 reg_1288 = dib8000_read_word(state, 1288) & ~(0x7 << 7);

        switch (mode) {
        case MPEG_ON_DIBTX:
                        dprintk("SET MPEG ON DIBSTREAM TX");
                        dib8096p_cfg_DibTx(state, 8, 5, 0, 0, 0, 0);
                        reg_1288 |= (1 << 9); break;
        case DIV_ON_DIBTX:
                        dprintk("SET DIV_OUT ON DIBSTREAM TX");
                        dib8096p_cfg_DibTx(state, 5, 5, 0, 0, 0, 0);
                        reg_1288 |= (1 << 8); break;
        case ADC_ON_DIBTX:
                        dprintk("SET ADC_OUT ON DIBSTREAM TX");
                        dib8096p_cfg_DibTx(state, 20, 5, 10, 0, 0, 0);
                        reg_1288 |= (1 << 7); break;
        default:
                        break;
        }
        dib8000_write_word(state, 1288, reg_1288);
}

static void dib8096p_setHostBusMux(struct dib8000_state *state, int mode)
{
        u16 reg_1288 = dib8000_read_word(state, 1288) & ~(0x7 << 4);

        switch (mode) {
        case DEMOUT_ON_HOSTBUS:
                        dprintk("SET DEM OUT OLD INTERF ON HOST BUS");
                        dib8096p_enMpegMux(state, 0);
                        reg_1288 |= (1 << 6);
                        break;
        case DIBTX_ON_HOSTBUS:
                        dprintk("SET DIBSTREAM TX ON HOST BUS");
                        dib8096p_enMpegMux(state, 0);
                        reg_1288 |= (1 << 5);
                        break;
        case MPEG_ON_HOSTBUS:
                        dprintk("SET MPEG MUX ON HOST BUS");
                        reg_1288 |= (1 << 4);
                        break;
        default:
                        break;
        }
        dib8000_write_word(state, 1288, reg_1288);
}

static int dib8096p_set_diversity_in(struct dvb_frontend *fe, int onoff)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 reg_1287;

        switch (onoff) {
        case 0: /* only use the internal way - not the diversity input */
                        dprintk("%s mode OFF : by default Enable Mpeg INPUT",
                                        __func__);
                        /* outputRate = 8 */
                        dib8096p_cfg_DibRx(state, 8, 5, 0, 0, 0, 8, 0);

                        /* Do not divide the serial clock of MPEG MUX in
                           SERIAL MODE in case input mode MPEG is used */
                        reg_1287 = dib8000_read_word(state, 1287);
                        /* enSerialClkDiv2 == 1 ? */
                        if ((reg_1287 & 0x1) == 1) {
                                /* force enSerialClkDiv2 = 0 */
                                reg_1287 &= ~0x1;
                                dib8000_write_word(state, 1287, reg_1287);
                        }
                        state->input_mode_mpeg = 1;
                        break;
        case 1: /* both ways */
        case 2: /* only the diversity input */
                        dprintk("%s ON : Enable diversity INPUT", __func__);
                        dib8096p_cfg_DibRx(state, 5, 5, 0, 0, 0, 0, 0);
                        state->input_mode_mpeg = 0;
                        break;
        }

        dib8000_set_diversity_in(state->fe[0], onoff);
        return 0;
}

static int dib8096p_set_output_mode(struct dvb_frontend *fe, int mode)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 outreg, smo_mode, fifo_threshold;
        u8 prefer_mpeg_mux_use = 1;
        int ret = 0;

        state->output_mode = mode;
        dib8096p_host_bus_drive(state, 1);

        fifo_threshold = 1792;
        smo_mode = (dib8000_read_word(state, 299) & 0x0050) | (1 << 1);
        outreg   = dib8000_read_word(state, 1286) &
                ~((1 << 10) | (0x7 << 6) | (1 << 1));

        switch (mode) {
        case OUTMODE_HIGH_Z:
                        outreg = 0;
                        break;

        case OUTMODE_MPEG2_SERIAL:
                        if (prefer_mpeg_mux_use) {
                                dprintk("dib8096P setting output mode TS_SERIAL using Mpeg Mux");
                                dib8096p_configMpegMux(state, 3, 1, 1);
                                dib8096p_setHostBusMux(state, MPEG_ON_HOSTBUS);
                        } else {/* Use Smooth block */
                                dprintk("dib8096P setting output mode TS_SERIAL using Smooth bloc");
                                dib8096p_setHostBusMux(state,
                                                DEMOUT_ON_HOSTBUS);
                                outreg |= (2 << 6) | (0 << 1);
                        }
                        break;

        case OUTMODE_MPEG2_PAR_GATED_CLK:
                        if (prefer_mpeg_mux_use) {
                                dprintk("dib8096P setting output mode TS_PARALLEL_GATED using Mpeg Mux");
                                dib8096p_configMpegMux(state, 2, 0, 0);
                                dib8096p_setHostBusMux(state, MPEG_ON_HOSTBUS);
                        } else { /* Use Smooth block */
                                dprintk("dib8096P setting output mode TS_PARALLEL_GATED using Smooth block");
                                dib8096p_setHostBusMux(state,
                                                DEMOUT_ON_HOSTBUS);
                                outreg |= (0 << 6);
                        }
                        break;

        case OUTMODE_MPEG2_PAR_CONT_CLK: /* Using Smooth block only */
                        dprintk("dib8096P setting output mode TS_PARALLEL_CONT using Smooth block");
                        dib8096p_setHostBusMux(state, DEMOUT_ON_HOSTBUS);
                        outreg |= (1 << 6);
                        break;

        case OUTMODE_MPEG2_FIFO:
                        /* Using Smooth block because not supported
                           by new Mpeg Mux bloc */
                        dprintk("dib8096P setting output mode TS_FIFO using Smooth block");
                        dib8096p_setHostBusMux(state, DEMOUT_ON_HOSTBUS);
                        outreg |= (5 << 6);
                        smo_mode |= (3 << 1);
                        fifo_threshold = 512;
                        break;

        case OUTMODE_DIVERSITY:
                        dprintk("dib8096P setting output mode MODE_DIVERSITY");
                        dib8096p_setDibTxMux(state, DIV_ON_DIBTX);
                        dib8096p_setHostBusMux(state, DIBTX_ON_HOSTBUS);
                        break;

        case OUTMODE_ANALOG_ADC:
                        dprintk("dib8096P setting output mode MODE_ANALOG_ADC");
                        dib8096p_setDibTxMux(state, ADC_ON_DIBTX);
                        dib8096p_setHostBusMux(state, DIBTX_ON_HOSTBUS);
                        break;
        }

        if (mode != OUTMODE_HIGH_Z)
                outreg |= (1<<10);

        dprintk("output_mpeg2_in_188_bytes = %d",
                        state->cfg.output_mpeg2_in_188_bytes);
        if (state->cfg.output_mpeg2_in_188_bytes)
                smo_mode |= (1 << 5);

        ret |= dib8000_write_word(state, 299, smo_mode);
        /* synchronous fread */
        ret |= dib8000_write_word(state, 299 + 1, fifo_threshold);
        ret |= dib8000_write_word(state, 1286, outreg);

        return ret;
}

static int map_addr_to_serpar_number(struct i2c_msg *msg)
{
        if (msg->buf[0] <= 15)
                msg->buf[0] -= 1;
        else if (msg->buf[0] == 17)
                msg->buf[0] = 15;
        else if (msg->buf[0] == 16)
                msg->buf[0] = 17;
        else if (msg->buf[0] == 19)
                msg->buf[0] = 16;
        else if (msg->buf[0] >= 21 && msg->buf[0] <= 25)
                msg->buf[0] -= 3;
        else if (msg->buf[0] == 28)
                msg->buf[0] = 23;
        else if (msg->buf[0] == 99)
                msg->buf[0] = 99;
        else
                return -EINVAL;
        return 0;
}

static int dib8096p_tuner_write_serpar(struct i2c_adapter *i2c_adap,
                struct i2c_msg msg[], int num)
{
        struct dib8000_state *state = i2c_get_adapdata(i2c_adap);
        u8 n_overflow = 1;
        u16 i = 1000;
        u16 serpar_num = msg[0].buf[0];

        while (n_overflow == 1 && i) {
                n_overflow = (dib8000_read_word(state, 1984) >> 1) & 0x1;
                i--;
                if (i == 0)
                        dprintk("Tuner ITF: write busy (overflow)");
        }
        dib8000_write_word(state, 1985, (1 << 6) | (serpar_num & 0x3f));
        dib8000_write_word(state, 1986, (msg[0].buf[1] << 8) | msg[0].buf[2]);

        return num;
}

static int dib8096p_tuner_read_serpar(struct i2c_adapter *i2c_adap,
                struct i2c_msg msg[], int num)
{
        struct dib8000_state *state = i2c_get_adapdata(i2c_adap);
        u8 n_overflow = 1, n_empty = 1;
        u16 i = 1000;
        u16 serpar_num = msg[0].buf[0];
        u16 read_word;

        while (n_overflow == 1 && i) {
                n_overflow = (dib8000_read_word(state, 1984) >> 1) & 0x1;
                i--;
                if (i == 0)
                        dprintk("TunerITF: read busy (overflow)");
        }
        dib8000_write_word(state, 1985, (0<<6) | (serpar_num&0x3f));

        i = 1000;
        while (n_empty == 1 && i) {
                n_empty = dib8000_read_word(state, 1984)&0x1;
                i--;
                if (i == 0)
                        dprintk("TunerITF: read busy (empty)");
        }

        read_word = dib8000_read_word(state, 1987);
        msg[1].buf[0] = (read_word >> 8) & 0xff;
        msg[1].buf[1] = (read_word) & 0xff;

        return num;
}

static int dib8096p_tuner_rw_serpar(struct i2c_adapter *i2c_adap,
                struct i2c_msg msg[], int num)
{
        if (map_addr_to_serpar_number(&msg[0]) == 0) {
                if (num == 1) /* write */
                        return dib8096p_tuner_write_serpar(i2c_adap, msg, 1);
                else /* read */
                        return dib8096p_tuner_read_serpar(i2c_adap, msg, 2);
        }
        return num;
}

static int dib8096p_rw_on_apb(struct i2c_adapter *i2c_adap,
                struct i2c_msg msg[], int num, u16 apb_address)
{
        struct dib8000_state *state = i2c_get_adapdata(i2c_adap);
        u16 word;

        if (num == 1) {         /* write */
                dib8000_write_word(state, apb_address,
                                ((msg[0].buf[1] << 8) | (msg[0].buf[2])));
        } else {
                word = dib8000_read_word(state, apb_address);
                msg[1].buf[0] = (word >> 8) & 0xff;
                msg[1].buf[1] = (word) & 0xff;
        }
        return num;
}

static int dib8096p_tuner_xfer(struct i2c_adapter *i2c_adap,
                struct i2c_msg msg[], int num)
{
        struct dib8000_state *state = i2c_get_adapdata(i2c_adap);
        u16 apb_address = 0, word;
        int i = 0;

        switch (msg[0].buf[0]) {
        case 0x12:
                        apb_address = 1920;
                        break;
        case 0x14:
                        apb_address = 1921;
                        break;
        case 0x24:
                        apb_address = 1922;
                        break;
        case 0x1a:
                        apb_address = 1923;
                        break;
        case 0x22:
                        apb_address = 1924;
                        break;
        case 0x33:
                        apb_address = 1926;
                        break;
        case 0x34:
                        apb_address = 1927;
                        break;
        case 0x35:
                        apb_address = 1928;
                        break;
        case 0x36:
                        apb_address = 1929;
                        break;
        case 0x37:
                        apb_address = 1930;
                        break;
        case 0x38:
                        apb_address = 1931;
                        break;
        case 0x39:
                        apb_address = 1932;
                        break;
        case 0x2a:
                        apb_address = 1935;
                        break;
        case 0x2b:
                        apb_address = 1936;
                        break;
        case 0x2c:
                        apb_address = 1937;
                        break;
        case 0x2d:
                        apb_address = 1938;
                        break;
        case 0x2e:
                        apb_address = 1939;
                        break;
        case 0x2f:
                        apb_address = 1940;
                        break;
        case 0x30:
                        apb_address = 1941;
                        break;
        case 0x31:
                        apb_address = 1942;
                        break;
        case 0x32:
                        apb_address = 1943;
                        break;
        case 0x3e:
                        apb_address = 1944;
                        break;
        case 0x3f:
                        apb_address = 1945;
                        break;
        case 0x40:
                        apb_address = 1948;
                        break;
        case 0x25:
                        apb_address = 936;
                        break;
        case 0x26:
                        apb_address = 937;
                        break;
        case 0x27:
                        apb_address = 938;
                        break;
        case 0x28:
                        apb_address = 939;
                        break;
        case 0x1d:
                        /* get sad sel request */
                        i = ((dib8000_read_word(state, 921) >> 12)&0x3);
                        word = dib8000_read_word(state, 924+i);
                        msg[1].buf[0] = (word >> 8) & 0xff;
                        msg[1].buf[1] = (word) & 0xff;
                        return num;
        case 0x1f:
                        if (num == 1) { /* write */
                                word = (u16) ((msg[0].buf[1] << 8) |
                                                msg[0].buf[2]);
                                /* in the VGAMODE Sel are located on bit 0/1 */
                                word &= 0x3;
                                word = (dib8000_read_word(state, 921) &
                                                ~(3<<12)) | (word<<12);
                                /* Set the proper input */
                                dib8000_write_word(state, 921, word);
                                return num;
                        }
        }

        if (apb_address != 0) /* R/W acces via APB */
                return dib8096p_rw_on_apb(i2c_adap, msg, num, apb_address);
        else  /* R/W access via SERPAR  */
                return dib8096p_tuner_rw_serpar(i2c_adap, msg, num);

        return 0;
}

static u32 dib8096p_i2c_func(struct i2c_adapter *adapter)
{
        return I2C_FUNC_I2C;
}

static struct i2c_algorithm dib8096p_tuner_xfer_algo = {
        .master_xfer = dib8096p_tuner_xfer,
        .functionality = dib8096p_i2c_func,
};

static struct i2c_adapter *dib8096p_get_i2c_tuner(struct dvb_frontend *fe)
{
        struct dib8000_state *st = fe->demodulator_priv;
        return &st->dib8096p_tuner_adap;
}

static int dib8096p_tuner_sleep(struct dvb_frontend *fe, int onoff)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 en_cur_state;

        dprintk("sleep dib8096p: %d", onoff);

        en_cur_state = dib8000_read_word(state, 1922);

        /* LNAs and MIX are ON and therefore it is a valid configuration */
        if (en_cur_state > 0xff)
                state->tuner_enable = en_cur_state ;

        if (onoff)
                en_cur_state &= 0x00ff;
        else {
                if (state->tuner_enable != 0)
                        en_cur_state = state->tuner_enable;
        }

        dib8000_write_word(state, 1922, en_cur_state);

        return 0;
}

static const s32 lut_1000ln_mant[] =
{
        908, 7003, 7090, 7170, 7244, 7313, 7377, 7438, 7495, 7549, 7600
};

static s32 dib8000_get_adc_power(struct dvb_frontend *fe, u8 mode)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u32 ix = 0, tmp_val = 0, exp = 0, mant = 0;
        s32 val;

        val = dib8000_read32(state, 384);
        if (mode) {
                tmp_val = val;
                while (tmp_val >>= 1)
                        exp++;
                mant = (val * 1000 / (1<<exp));
                ix = (u8)((mant-1000)/100); /* index of the LUT */
                val = (lut_1000ln_mant[ix] + 693*(exp-20) - 6908);
                val = (val*256)/1000;
        }
        return val;
}

static int dib8090p_get_dc_power(struct dvb_frontend *fe, u8 IQ)
{
        struct dib8000_state *state = fe->demodulator_priv;
        int val = 0;

        switch (IQ) {
        case 1:
                        val = dib8000_read_word(state, 403);
                        break;
        case 0:
                        val = dib8000_read_word(state, 404);
                        break;
        }
        if (val  & 0x200)
                val -= 1024;

        return val;
}

static void dib8000_update_timf(struct dib8000_state *state)
{
        u32 timf = state->timf = dib8000_read32(state, 435);

        dib8000_write_word(state, 29, (u16) (timf >> 16));
        dib8000_write_word(state, 30, (u16) (timf & 0xffff));
        dprintk("Updated timing frequency: %d (default: %d)", state->timf, state->timf_default);
}

static u32 dib8000_ctrl_timf(struct dvb_frontend *fe, uint8_t op, uint32_t timf)
{
        struct dib8000_state *state = fe->demodulator_priv;

        switch (op) {
        case DEMOD_TIMF_SET:
                        state->timf = timf;
                        break;
        case DEMOD_TIMF_UPDATE:
                        dib8000_update_timf(state);
                        break;
        case DEMOD_TIMF_GET:
                        break;
        }
        dib8000_set_bandwidth(state->fe[0], 6000);

        return state->timf;
}

static const u16 adc_target_16dB[11] = {
        7250, 7238, 7264, 7309, 7338, 7382, 7427, 7456, 7500, 7544, 7574
};

static const u8 permu_seg[] = { 6, 5, 7, 4, 8, 3, 9, 2, 10, 1, 11, 0, 12 };

static u16 dib8000_set_layer(struct dib8000_state *state, u8 layer_index, u16 max_constellation)
{
        u8  cr, constellation, time_intlv;
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;

        switch (c->layer[layer_index].modulation) {
        case DQPSK:
                        constellation = 0;
                        break;
        case  QPSK:
                        constellation = 1;
                        break;

        case QAM_16:
                        constellation = 2;
                        break;
        case QAM_64:
        default:
                        constellation = 3;
                        break;
        }

        switch (c->layer[layer_index].fec) {
        case FEC_1_2:
                        cr = 1;
                        break;
        case FEC_2_3:
                        cr = 2;
                        break;
        case FEC_3_4:
                        cr = 3;
                        break;
        case FEC_5_6:
                        cr = 5;
                        break;
        case FEC_7_8:
        default:
                        cr = 7;
                        break;
        }

        time_intlv = fls(c->layer[layer_index].interleaving);
        if (time_intlv > 3 && !(time_intlv == 4 && c->isdbt_sb_mode == 1))
                time_intlv = 0;

        dib8000_write_word(state, 2 + layer_index, (constellation << 10) | ((c->layer[layer_index].segment_count & 0xf) << 6) | (cr << 3) | time_intlv);
        if (c->layer[layer_index].segment_count > 0) {
                switch (max_constellation) {
                case DQPSK:
                case QPSK:
                                if (c->layer[layer_index].modulation == QAM_16 || c->layer[layer_index].modulation == QAM_64)
                                        max_constellation = c->layer[layer_index].modulation;
                                break;
                case QAM_16:
                                if (c->layer[layer_index].modulation == QAM_64)
                                        max_constellation = c->layer[layer_index].modulation;
                                break;
                }
        }

        return  max_constellation;
}

static const u16 adp_Q64[4] = {0x0148, 0xfff0, 0x00a4, 0xfff8}; /* P_adp_regul_cnt 0.04, P_adp_noise_cnt -0.002, P_adp_regul_ext 0.02, P_adp_noise_ext -0.001 */
static const u16 adp_Q16[4] = {0x023d, 0xffdf, 0x00a4, 0xfff0}; /* P_adp_regul_cnt 0.07, P_adp_noise_cnt -0.004, P_adp_regul_ext 0.02, P_adp_noise_ext -0.002 */
static const u16 adp_Qdefault[4] = {0x099a, 0xffae, 0x0333, 0xfff8}; /* P_adp_regul_cnt 0.3,  P_adp_noise_cnt -0.01,  P_adp_regul_ext 0.1,  P_adp_noise_ext -0.002 */
static u16 dib8000_adp_fine_tune(struct dib8000_state *state, u16 max_constellation)
{
        u16 i, ana_gain = 0;
        const u16 *adp;

        /* channel estimation fine configuration */
        switch (max_constellation) {
        case QAM_64:
                        ana_gain = 0x7;
                        adp = &adp_Q64[0];
                        break;
        case QAM_16:
                        ana_gain = 0x7;
                        adp = &adp_Q16[0];
                        break;
        default:
                        ana_gain = 0;
                        adp = &adp_Qdefault[0];
                        break;
        }

        for (i = 0; i < 4; i++)
                dib8000_write_word(state, 215 + i, adp[i]);

        return ana_gain;
}

static void dib8000_update_ana_gain(struct dib8000_state *state, u16 ana_gain)
{
        u16 i;

        dib8000_write_word(state, 116, ana_gain);

        /* update ADC target depending on ana_gain */
        if (ana_gain) { /* set -16dB ADC target for ana_gain=-1 */
                for (i = 0; i < 10; i++)
                        dib8000_write_word(state, 80 + i, adc_target_16dB[i]);
        } else { /* set -22dB ADC target for ana_gain=0 */
                for (i = 0; i < 10; i++)
                        dib8000_write_word(state, 80 + i, adc_target_16dB[i] - 355);
        }
}

static void dib8000_load_ana_fe_coefs(struct dib8000_state *state, const s16 *ana_fe)
{
        u16 mode = 0;

        if (state->isdbt_cfg_loaded == 0)
                for (mode = 0; mode < 24; mode++)
                        dib8000_write_word(state, 117 + mode, ana_fe[mode]);
}

static const u16 lut_prbs_2k[14] = {
        0, 0x423, 0x009, 0x5C7, 0x7A6, 0x3D8, 0x527, 0x7FF, 0x79B, 0x3D6, 0x3A2, 0x53B, 0x2F4, 0x213
};
static const u16 lut_prbs_4k[14] = {
        0, 0x208, 0x0C3, 0x7B9, 0x423, 0x5C7, 0x3D8, 0x7FF, 0x3D6, 0x53B, 0x213, 0x029, 0x0D0, 0x48E
};
static const u16 lut_prbs_8k[14] = {
        0, 0x740, 0x069, 0x7DD, 0x208, 0x7B9, 0x5C7, 0x7FF, 0x53B, 0x029, 0x48E, 0x4C4, 0x367, 0x684
};

static u16 dib8000_get_init_prbs(struct dib8000_state *state, u16 subchannel)
{
        int sub_channel_prbs_group = 0;

        sub_channel_prbs_group = (subchannel / 3) + 1;
        dprintk("sub_channel_prbs_group = %d , subchannel =%d prbs = 0x%04x", sub_channel_prbs_group, subchannel, lut_prbs_8k[sub_channel_prbs_group]);

        switch (state->fe[0]->dtv_property_cache.transmission_mode) {
        case TRANSMISSION_MODE_2K:
                        return lut_prbs_2k[sub_channel_prbs_group];
        case TRANSMISSION_MODE_4K:
                        return lut_prbs_4k[sub_channel_prbs_group];
        default:
        case TRANSMISSION_MODE_8K:
                        return lut_prbs_8k[sub_channel_prbs_group];
        }
}

static void dib8000_set_13seg_channel(struct dib8000_state *state)
{
        u16 i;
        u16 coff_pow = 0x2800;

        state->seg_mask = 0x1fff; /* All 13 segments enabled */

        /* ---- COFF ---- Carloff, the most robust --- */
        if (state->isdbt_cfg_loaded == 0) {  /* if not Sound Broadcasting mode : put default values for 13 segments */
                dib8000_write_word(state, 180, (16 << 6) | 9);
                dib8000_write_word(state, 187, (4 << 12) | (8 << 5) | 0x2);
                coff_pow = 0x2800;
                for (i = 0; i < 6; i++)
                        dib8000_write_word(state, 181+i, coff_pow);

                /* P_ctrl_corm_thres4pre_freq_inh=1, P_ctrl_pre_freq_mode_sat=1 */
                /* P_ctrl_pre_freq_mode_sat=1, P_ctrl_pre_freq_inh=0, P_ctrl_pre_freq_step = 3, P_pre_freq_win_len=1 */
                dib8000_write_word(state, 338, (1 << 12) | (1 << 10) | (0 << 9) | (3 << 5) | 1);

                /* P_ctrl_pre_freq_win_len=8, P_ctrl_pre_freq_thres_lockin=6 */
                dib8000_write_word(state, 340, (8 << 6) | (6 << 0));
                /* P_ctrl_pre_freq_thres_lockout=4, P_small_use_tmcc/ac/cp=1 */
                dib8000_write_word(state, 341, (4 << 3) | (1 << 2) | (1 << 1) | (1 << 0));

                dib8000_write_word(state, 228, 0);  /* default value */
                dib8000_write_word(state, 265, 31); /* default value */
                dib8000_write_word(state, 205, 0x200f); /* init value */
        }

        /*
         * make the cpil_coff_lock more robust but slower p_coff_winlen
         * 6bits; p_coff_thres_lock 6bits (for coff lock if needed)
         */

        if (state->cfg.pll->ifreq == 0)
                dib8000_write_word(state, 266, ~state->seg_mask | state->seg_diff_mask | 0x40); /* P_equal_noise_seg_inh */

        dib8000_load_ana_fe_coefs(state, ana_fe_coeff_13seg);
}

static void dib8000_set_subchannel_prbs(struct dib8000_state *state, u16 init_prbs)
{
        u16 reg_1;

        reg_1 = dib8000_read_word(state, 1);
        dib8000_write_word(state, 1, (init_prbs << 2) | (reg_1 & 0x3)); /* ADDR 1 */
}

static void dib8000_small_fine_tune(struct dib8000_state *state)
{
        u16 i;
        const s16 *ncoeff;
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;

        dib8000_write_word(state, 352, state->seg_diff_mask);
        dib8000_write_word(state, 353, state->seg_mask);

        /* P_small_coef_ext_enable=ISDB-Tsb, P_small_narrow_band=ISDB-Tsb, P_small_last_seg=13, P_small_offset_num_car=5 */
        dib8000_write_word(state, 351, (c->isdbt_sb_mode << 9) | (c->isdbt_sb_mode << 8) | (13 << 4) | 5);

        if (c->isdbt_sb_mode) {
                /* ---- SMALL ---- */
                switch (c->transmission_mode) {
                case TRANSMISSION_MODE_2K:
                                if (c->isdbt_partial_reception == 0) { /* 1-seg */
                                        if (c->layer[0].modulation == DQPSK) /* DQPSK */
                                                ncoeff = coeff_2k_sb_1seg_dqpsk;
                                        else /* QPSK or QAM */
                                                ncoeff = coeff_2k_sb_1seg;
                                } else { /* 3-segments */
                                        if (c->layer[0].modulation == DQPSK) { /* DQPSK on central segment */
                                                if (c->layer[1].modulation == DQPSK) /* DQPSK on external segments */
                                                        ncoeff = coeff_2k_sb_3seg_0dqpsk_1dqpsk;
                                                else /* QPSK or QAM on external segments */
                                                        ncoeff = coeff_2k_sb_3seg_0dqpsk;
                                        } else { /* QPSK or QAM on central segment */
                                                if (c->layer[1].modulation == DQPSK) /* DQPSK on external segments */
                                                        ncoeff = coeff_2k_sb_3seg_1dqpsk;
                                                else /* QPSK or QAM on external segments */
                                                        ncoeff = coeff_2k_sb_3seg;
                                        }
                                }
                                break;
                case TRANSMISSION_MODE_4K:
                                if (c->isdbt_partial_reception == 0) { /* 1-seg */
                                        if (c->layer[0].modulation == DQPSK) /* DQPSK */
                                                ncoeff = coeff_4k_sb_1seg_dqpsk;
                                        else /* QPSK or QAM */
                                                ncoeff = coeff_4k_sb_1seg;
                                } else { /* 3-segments */
                                        if (c->layer[0].modulation == DQPSK) { /* DQPSK on central segment */
                                                if (c->layer[1].modulation == DQPSK) /* DQPSK on external segments */
                                                        ncoeff = coeff_4k_sb_3seg_0dqpsk_1dqpsk;
                                                else /* QPSK or QAM on external segments */
                                                        ncoeff = coeff_4k_sb_3seg_0dqpsk;
                                        } else { /* QPSK or QAM on central segment */
                                                if (c->layer[1].modulation == DQPSK) /* DQPSK on external segments */
                                                        ncoeff = coeff_4k_sb_3seg_1dqpsk;
                                                else /* QPSK or QAM on external segments */
                                                        ncoeff = coeff_4k_sb_3seg;
                                        }
                                }
                                break;
                case TRANSMISSION_MODE_AUTO:
                case TRANSMISSION_MODE_8K:
                default:
                                if (c->isdbt_partial_reception == 0) { /* 1-seg */
                                        if (c->layer[0].modulation == DQPSK) /* DQPSK */
                                                ncoeff = coeff_8k_sb_1seg_dqpsk;
                                        else /* QPSK or QAM */
                                                ncoeff = coeff_8k_sb_1seg;
                                } else { /* 3-segments */
                                        if (c->layer[0].modulation == DQPSK) { /* DQPSK on central segment */
                                                if (c->layer[1].modulation == DQPSK) /* DQPSK on external segments */
                                                        ncoeff = coeff_8k_sb_3seg_0dqpsk_1dqpsk;
                                                else /* QPSK or QAM on external segments */
                                                        ncoeff = coeff_8k_sb_3seg_0dqpsk;
                                        } else { /* QPSK or QAM on central segment */
                                                if (c->layer[1].modulation == DQPSK) /* DQPSK on external segments */
                                                        ncoeff = coeff_8k_sb_3seg_1dqpsk;
                                                else /* QPSK or QAM on external segments */
                                                        ncoeff = coeff_8k_sb_3seg;
                                        }
                                }
                                break;
                }

                for (i = 0; i < 8; i++)
                        dib8000_write_word(state, 343 + i, ncoeff[i]);
        }
}

static const u16 coff_thres_1seg[3] = {300, 150, 80};
static const u16 coff_thres_3seg[3] = {350, 300, 250};
static void dib8000_set_sb_channel(struct dib8000_state *state)
{
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        const u16 *coff;
        u16 i;

        if (c->transmission_mode == TRANSMISSION_MODE_2K || c->transmission_mode == TRANSMISSION_MODE_4K) {
                dib8000_write_word(state, 219, dib8000_read_word(state, 219) | 0x1); /* adp_pass =1 */
                dib8000_write_word(state, 190, dib8000_read_word(state, 190) | (0x1 << 14)); /* pha3_force_pha_shift = 1 */
        } else {
                dib8000_write_word(state, 219, dib8000_read_word(state, 219) & 0xfffe); /* adp_pass =0 */
                dib8000_write_word(state, 190, dib8000_read_word(state, 190) & 0xbfff); /* pha3_force_pha_shift = 0 */
        }

        if (c->isdbt_partial_reception == 1) /* 3-segments */
                state->seg_mask = 0x00E0;
        else /* 1-segment */
                state->seg_mask = 0x0040;

        dib8000_write_word(state, 268, (dib8000_read_word(state, 268) & 0xF9FF) | 0x0200);

        /* ---- COFF ---- Carloff, the most robust --- */
        /* P_coff_cpil_alpha=4, P_coff_inh=0, P_coff_cpil_winlen=64, P_coff_narrow_band=1, P_coff_square_val=1, P_coff_one_seg=~partial_rcpt, P_coff_use_tmcc=1, P_coff_use_ac=1 */
        dib8000_write_word(state, 187, (4 << 12) | (0 << 11) | (63 << 5) | (0x3 << 3) | ((~c->isdbt_partial_reception & 1) << 2) | 0x3);

        dib8000_write_word(state, 340, (16 << 6) | (8 << 0)); /* P_ctrl_pre_freq_win_len=16, P_ctrl_pre_freq_thres_lockin=8 */
        dib8000_write_word(state, 341, (6 << 3) | (1 << 2) | (1 << 1) | (1 << 0));/* P_ctrl_pre_freq_thres_lockout=6, P_small_use_tmcc/ac/cp=1 */

        /* Sound Broadcasting mode 1 seg */
        if (c->isdbt_partial_reception == 0) {
                /* P_coff_winlen=63, P_coff_thres_lock=15, P_coff_one_seg_width = (P_mode == 3) , P_coff_one_seg_sym = (P_mode-1) */
                if (state->mode == 3)
                        dib8000_write_word(state, 180, 0x1fcf | ((state->mode - 1) << 14));
                else
                        dib8000_write_word(state, 180, 0x0fcf | ((state->mode - 1) << 14));

                /* P_ctrl_corm_thres4pre_freq_inh=1,P_ctrl_pre_freq_mode_sat=1, P_ctrl_pre_freq_inh=0, P_ctrl_pre_freq_step = 5, P_pre_freq_win_len=4 */
                dib8000_write_word(state, 338, (1 << 12) | (1 << 10) | (0 << 9) | (5 << 5) | 4);
                coff = &coff_thres_1seg[0];
        } else {   /* Sound Broadcasting mode 3 seg */
                dib8000_write_word(state, 180, 0x1fcf | (1 << 14));
                /* P_ctrl_corm_thres4pre_freq_inh = 1, P_ctrl_pre_freq_mode_sat=1, P_ctrl_pre_freq_inh=0, P_ctrl_pre_freq_step = 4, P_pre_freq_win_len=4 */
                dib8000_write_word(state, 338, (1 << 12) | (1 << 10) | (0 << 9) | (4 << 5) | 4);
                coff = &coff_thres_3seg[0];
        }

        dib8000_write_word(state, 228, 1); /* P_2d_mode_byp=1 */
        dib8000_write_word(state, 205, dib8000_read_word(state, 205) & 0xfff0); /* P_cspu_win_cut = 0 */

        if (c->isdbt_partial_reception == 0 && c->transmission_mode == TRANSMISSION_MODE_2K)
                dib8000_write_word(state, 265, 15); /* P_equal_noise_sel = 15 */

        /* Write COFF thres */
        for (i = 0 ; i < 3; i++) {
                dib8000_write_word(state, 181+i, coff[i]);
                dib8000_write_word(state, 184+i, coff[i]);
        }

        /*
         * make the cpil_coff_lock more robust but slower p_coff_winlen
         * 6bits; p_coff_thres_lock 6bits (for coff lock if needed)
         */

        dib8000_write_word(state, 266, ~state->seg_mask | state->seg_diff_mask); /* P_equal_noise_seg_inh */

        if (c->isdbt_partial_reception == 0)
                dib8000_write_word(state, 178, 64); /* P_fft_powrange = 64 */
        else
                dib8000_write_word(state, 178, 32); /* P_fft_powrange = 32 */
}

static void dib8000_set_isdbt_common_channel(struct dib8000_state *state, u8 seq, u8 autosearching)
{
        u16 p_cfr_left_edge  = 0, p_cfr_right_edge = 0;
        u16 tmcc_pow = 0, ana_gain = 0, tmp = 0, i = 0, nbseg_diff = 0 ;
        u16 max_constellation = DQPSK;
        int init_prbs;
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;

        if (autosearching)
                c->isdbt_partial_reception = 1;

        /* P_mode */
        dib8000_write_word(state, 10, (seq << 4));

        /* init mode */
        state->mode = fft_to_mode(state);

        /* set guard */
        tmp = dib8000_read_word(state, 1);
        dib8000_write_word(state, 1, (tmp&0xfffc) | (c->guard_interval & 0x3));

        dib8000_write_word(state, 274, (dib8000_read_word(state, 274) & 0xffcf) | ((c->isdbt_partial_reception & 1) << 5) | ((c->isdbt_sb_mode & 1) << 4));

        /* signal optimization parameter */
        if (c->isdbt_partial_reception) {
                state->seg_diff_mask = (c->layer[0].modulation == DQPSK) << permu_seg[0];
                for (i = 1; i < 3; i++)
                        nbseg_diff += (c->layer[i].modulation == DQPSK) * c->layer[i].segment_count;
                for (i = 0; i < nbseg_diff; i++)
                        state->seg_diff_mask |= 1 << permu_seg[i+1];
        } else {
                for (i = 0; i < 3; i++)
                        nbseg_diff += (c->layer[i].modulation == DQPSK) * c->layer[i].segment_count;
                for (i = 0; i < nbseg_diff; i++)
                        state->seg_diff_mask |= 1 << permu_seg[i];
        }

        if (state->seg_diff_mask)
                dib8000_write_word(state, 268, (dib8000_read_word(state, 268) & 0xF9FF) | 0x0200);
        else
                dib8000_write_word(state, 268, (2 << 9) | 39); /*init value */

        for (i = 0; i < 3; i++)
                max_constellation = dib8000_set_layer(state, i, max_constellation);
        if (autosearching == 0) {
                state->layer_b_nb_seg = c->layer[1].segment_count;
                state->layer_c_nb_seg = c->layer[2].segment_count;
        }

        /* WRITE: Mode & Diff mask */
        dib8000_write_word(state, 0, (state->mode << 13) | state->seg_diff_mask);

        state->differential_constellation = (state->seg_diff_mask != 0);

        /* channel estimation fine configuration */
        ana_gain = dib8000_adp_fine_tune(state, max_constellation);

        /* update ana_gain depending on max constellation */
        dib8000_update_ana_gain(state, ana_gain);

        /* ---- ANA_FE ---- */
        if (c->isdbt_partial_reception) /* 3-segments */
                dib8000_load_ana_fe_coefs(state, ana_fe_coeff_3seg);
        else
                dib8000_load_ana_fe_coefs(state, ana_fe_coeff_1seg); /* 1-segment */

        /* TSB or ISDBT ? apply it now */
        if (c->isdbt_sb_mode) {
                dib8000_set_sb_channel(state);
                if (c->isdbt_sb_subchannel < 14)
                        init_prbs = dib8000_get_init_prbs(state, c->isdbt_sb_subchannel);
                else
                        init_prbs = 0;
        } else {
                dib8000_set_13seg_channel(state);
                init_prbs = 0xfff;
        }

        /* SMALL */
        dib8000_small_fine_tune(state);

        dib8000_set_subchannel_prbs(state, init_prbs);

        /* ---- CHAN_BLK ---- */
        for (i = 0; i < 13; i++) {
                if ((((~state->seg_diff_mask) >> i) & 1) == 1) {
                        p_cfr_left_edge  += (1 << i) * ((i == 0) || ((((state->seg_mask & (~state->seg_diff_mask)) >> (i - 1)) & 1) == 0));
                        p_cfr_right_edge += (1 << i) * ((i == 12) || ((((state->seg_mask & (~state->seg_diff_mask)) >> (i + 1)) & 1) == 0));
                }
        }
        dib8000_write_word(state, 222, p_cfr_left_edge); /* p_cfr_left_edge */
        dib8000_write_word(state, 223, p_cfr_right_edge); /* p_cfr_right_edge */
        /* "P_cspu_left_edge" & "P_cspu_right_edge" not used => do not care */

        dib8000_write_word(state, 189, ~state->seg_mask | state->seg_diff_mask); /* P_lmod4_seg_inh */
        dib8000_write_word(state, 192, ~state->seg_mask | state->seg_diff_mask); /* P_pha3_seg_inh */
        dib8000_write_word(state, 225, ~state->seg_mask | state->seg_diff_mask); /* P_tac_seg_inh */

        if (!autosearching)
                dib8000_write_word(state, 288, (~state->seg_mask | state->seg_diff_mask) & 0x1fff); /* P_tmcc_seg_eq_inh */
        else
                dib8000_write_word(state, 288, 0x1fff); /*disable equalisation of the tmcc when autosearch to be able to find the DQPSK channels. */

        dib8000_write_word(state, 211, state->seg_mask & (~state->seg_diff_mask)); /* P_des_seg_enabled */
        dib8000_write_word(state, 287, ~state->seg_mask | 0x1000); /* P_tmcc_seg_inh */

        dib8000_write_word(state, 178, 32); /* P_fft_powrange = 32 */

        /* ---- TMCC ---- */
        for (i = 0; i < 3; i++)
                tmcc_pow += (((c->layer[i].modulation == DQPSK) * 4 + 1) * c->layer[i].segment_count) ;

        /* Quantif of "P_tmcc_dec_thres_?k" is (0, 5+mode, 9); */
        /* Threshold is set at 1/4 of max power. */
        tmcc_pow *= (1 << (9-2));
        dib8000_write_word(state, 290, tmcc_pow); /* P_tmcc_dec_thres_2k */
        dib8000_write_word(state, 291, tmcc_pow); /* P_tmcc_dec_thres_4k */
        dib8000_write_word(state, 292, tmcc_pow); /* P_tmcc_dec_thres_8k */
        /*dib8000_write_word(state, 287, (1 << 13) | 0x1000 ); */

        /* ---- PHA3 ---- */
        if (state->isdbt_cfg_loaded == 0)
                dib8000_write_word(state, 250, 3285); /* p_2d_hspeed_thr0 */

        state->isdbt_cfg_loaded = 0;
}

static u32 dib8000_wait_lock(struct dib8000_state *state, u32 internal,
                             u32 wait0_ms, u32 wait1_ms, u32 wait2_ms)
{
        u32 value = 0;  /* P_search_end0 wait time */
        u16 reg = 11;   /* P_search_end0 start addr */

        for (reg = 11; reg < 16; reg += 2) {
                if (reg == 11) {
                        if (state->revision == 0x8090)
                                value = internal * wait1_ms;
                        else
                                value = internal * wait0_ms;
                } else if (reg == 13)
                        value = internal * wait1_ms;
                else if (reg == 15)
                        value = internal * wait2_ms;
                dib8000_write_word(state, reg, (u16)((value >> 16) & 0xffff));
                dib8000_write_word(state, (reg + 1), (u16)(value & 0xffff));
        }
        return value;
}

static int dib8000_autosearch_start(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        u8 slist = 0;
        u32 value, internal = state->cfg.pll->internal;

        if (state->revision == 0x8090)
                internal = dib8000_read32(state, 23) / 1000;

        if ((state->revision >= 0x8002) &&
            (state->autosearch_state == AS_SEARCHING_FFT)) {
                dib8000_write_word(state,  37, 0x0065); /* P_ctrl_pha_off_max default values */
                dib8000_write_word(state, 116, 0x0000); /* P_ana_gain to 0 */

                dib8000_write_word(state, 0, (dib8000_read_word(state, 0) & 0x1fff) | (0 << 13) | (1 << 15)); /* P_mode = 0, P_restart_search=1 */
                dib8000_write_word(state, 1, (dib8000_read_word(state, 1) & 0xfffc) | 0); /* P_guard = 0 */
                dib8000_write_word(state, 6, 0); /* P_lock0_mask = 0 */
                dib8000_write_word(state, 7, 0); /* P_lock1_mask = 0 */
                dib8000_write_word(state, 8, 0); /* P_lock2_mask = 0 */
                dib8000_write_word(state, 10, (dib8000_read_word(state, 10) & 0x200) | (16 << 4) | (0 << 0)); /* P_search_list=16, P_search_maxtrial=0 */

                if (state->revision == 0x8090)
                        value = dib8000_wait_lock(state, internal, 10, 10, 10); /* time in ms configure P_search_end0 P_search_end1 P_search_end2 */
                else
                        value = dib8000_wait_lock(state, internal, 20, 20, 20); /* time in ms configure P_search_end0 P_search_end1 P_search_end2 */

                dib8000_write_word(state, 17, 0);
                dib8000_write_word(state, 18, 200); /* P_search_rstst = 200 */
                dib8000_write_word(state, 19, 0);
                dib8000_write_word(state, 20, 400); /* P_search_rstend = 400 */
                dib8000_write_word(state, 21, (value >> 16) & 0xffff); /* P_search_checkst */
                dib8000_write_word(state, 22, value & 0xffff);

                if (state->revision == 0x8090)
                        dib8000_write_word(state, 32, (dib8000_read_word(state, 32) & 0xf0ff) | (0 << 8)); /* P_corm_alpha = 0 */
                else
                        dib8000_write_word(state, 32, (dib8000_read_word(state, 32) & 0xf0ff) | (9 << 8)); /* P_corm_alpha = 3 */
                dib8000_write_word(state, 355, 2); /* P_search_param_max = 2 */

                /* P_search_param_select = (1 | 1<<4 | 1 << 8) */
                dib8000_write_word(state, 356, 0);
                dib8000_write_word(state, 357, 0x111);

                dib8000_write_word(state, 770, (dib8000_read_word(state, 770) & 0xdfff) | (1 << 13)); /* P_restart_ccg = 1 */
                dib8000_write_word(state, 770, (dib8000_read_word(state, 770) & 0xdfff) | (0 << 13)); /* P_restart_ccg = 0 */
                dib8000_write_word(state, 0, (dib8000_read_word(state, 0) & 0x7ff) | (0 << 15) | (1 << 13)); /* P_restart_search = 0; */
        } else if ((state->revision >= 0x8002) &&
                   (state->autosearch_state == AS_SEARCHING_GUARD)) {
                c->transmission_mode = TRANSMISSION_MODE_8K;
                c->guard_interval = GUARD_INTERVAL_1_8;
                c->inversion = 0;
                c->layer[0].modulation = QAM_64;
                c->layer[0].fec = FEC_2_3;
                c->layer[0].interleaving = 0;
                c->layer[0].segment_count = 13;

                slist = 16;
                c->transmission_mode = state->found_nfft;

                dib8000_set_isdbt_common_channel(state, slist, 1);

                /* set lock_mask values */
                dib8000_write_word(state, 6, 0x4);
                if (state->revision == 0x8090)
                        dib8000_write_word(state, 7, ((1 << 12) | (1 << 11) | (1 << 10)));/* tmcc_dec_lock, tmcc_sync_lock, tmcc_data_lock, tmcc_bch_uncor */
                else
                        dib8000_write_word(state, 7, 0x8);
                dib8000_write_word(state, 8, 0x1000);

                /* set lock_mask wait time values */
                if (state->revision == 0x8090)
                        dib8000_wait_lock(state, internal, 50, 100, 1000); /* time in ms configure P_search_end0 P_search_end1 P_search_end2 */
                else
                        dib8000_wait_lock(state, internal, 50, 200, 1000); /* time in ms configure P_search_end0 P_search_end1 P_search_end2 */

                dib8000_write_word(state, 355, 3); /* P_search_param_max = 3 */

                /* P_search_param_select = 0xf; look for the 4 different guard intervals */
                dib8000_write_word(state, 356, 0);
                dib8000_write_word(state, 357, 0xf);

                value = dib8000_read_word(state, 0);
                dib8000_write_word(state, 0, (u16)((1 << 15) | value));
                dib8000_read_word(state, 1284);  /* reset the INT. n_irq_pending */
                dib8000_write_word(state, 0, (u16)value);
        } else {
                c->inversion = 0;
                c->layer[0].modulation = QAM_64;
                c->layer[0].fec = FEC_2_3;
                c->layer[0].interleaving = 0;
                c->layer[0].segment_count = 13;
                if (!c->isdbt_sb_mode)
                        c->layer[0].segment_count = 13;

                /* choose the right list, in sb, always do everything */
                if (c->isdbt_sb_mode) {
                        slist = 7;
                        dib8000_write_word(state, 0, (dib8000_read_word(state, 0) & 0x9fff) | (1 << 13));
                } else {
                        if (c->guard_interval == GUARD_INTERVAL_AUTO) {
                                if (c->transmission_mode == TRANSMISSION_MODE_AUTO) {
                                        c->transmission_mode = TRANSMISSION_MODE_8K;
                                        c->guard_interval = GUARD_INTERVAL_1_8;
                                        slist = 7;
                                        dib8000_write_word(state, 0, (dib8000_read_word(state, 0) & 0x9fff) | (1 << 13));  /* P_mode = 1 to have autosearch start ok with mode2 */
                                } else {
                                        c->guard_interval = GUARD_INTERVAL_1_8;
                                        slist = 3;
                                }
                        } else {
                                if (c->transmission_mode == TRANSMISSION_MODE_AUTO) {
                                        c->transmission_mode = TRANSMISSION_MODE_8K;
                                        slist = 2;
                                        dib8000_write_word(state, 0, (dib8000_read_word(state, 0) & 0x9fff) | (1 << 13));  /* P_mode = 1 */
                                } else
                                        slist = 0;
                        }
                }
                dprintk("Using list for autosearch : %d", slist);

                dib8000_set_isdbt_common_channel(state, slist, 1);

                /* set lock_mask values */
                dib8000_write_word(state, 6, 0x4);
                if (state->revision == 0x8090)
                        dib8000_write_word(state, 7, (1 << 12) | (1 << 11) | (1 << 10));
                else
                        dib8000_write_word(state, 7, 0x8);
                dib8000_write_word(state, 8, 0x1000);

                /* set lock_mask wait time values */
                if (state->revision == 0x8090)
                        dib8000_wait_lock(state, internal, 50, 200, 1000); /* time in ms configure P_search_end0 P_search_end1 P_search_end2 */
                else
                        dib8000_wait_lock(state, internal, 50, 100, 1000); /* time in ms configure P_search_end0 P_search_end1 P_search_end2 */

                value = dib8000_read_word(state, 0);
                dib8000_write_word(state, 0, (u16)((1 << 15) | value));
                dib8000_read_word(state, 1284);  /* reset the INT. n_irq_pending */
                dib8000_write_word(state, 0, (u16)value);
        }
        return 0;
}

static int dib8000_autosearch_irq(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 irq_pending = dib8000_read_word(state, 1284);

        if ((state->revision >= 0x8002) &&
            (state->autosearch_state == AS_SEARCHING_FFT)) {
                if (irq_pending & 0x1) {
                        dprintk("dib8000_autosearch_irq: max correlation result available");
                        return 3;
                }
        } else {
                if (irq_pending & 0x1) {        /* failed */
                        dprintk("dib8000_autosearch_irq failed");
                        return 1;
                }

                if (irq_pending & 0x2) {        /* succeeded */
                        dprintk("dib8000_autosearch_irq succeeded");
                        return 2;
                }
        }

        return 0;               // still pending
}

static void dib8000_viterbi_state(struct dib8000_state *state, u8 onoff)
{
        u16 tmp;

        tmp = dib8000_read_word(state, 771);
        if (onoff) /* start P_restart_chd : channel_decoder */
                dib8000_write_word(state, 771, tmp & 0xfffd);
        else /* stop P_restart_chd : channel_decoder */
                dib8000_write_word(state, 771, tmp | (1<<1));
}

static void dib8000_set_dds(struct dib8000_state *state, s32 offset_khz)
{
        s16 unit_khz_dds_val;
        u32 abs_offset_khz = ABS(offset_khz);
        u32 dds = state->cfg.pll->ifreq & 0x1ffffff;
        u8 invert = !!(state->cfg.pll->ifreq & (1 << 25));
        u8 ratio;

        if (state->revision == 0x8090) {
                ratio = 4;
                unit_khz_dds_val = (1<<26) / (dib8000_read32(state, 23) / 1000);
                if (offset_khz < 0)
                        dds = (1 << 26) - (abs_offset_khz * unit_khz_dds_val);
                else
                        dds = (abs_offset_khz * unit_khz_dds_val);

                if (invert)
                        dds = (1<<26) - dds;
        } else {
                ratio = 2;
                unit_khz_dds_val = (u16) (67108864 / state->cfg.pll->internal);

                if (offset_khz < 0)
                        unit_khz_dds_val *= -1;

                /* IF tuner */
                if (invert)
                        dds -= abs_offset_khz * unit_khz_dds_val;
                else
                        dds += abs_offset_khz * unit_khz_dds_val;
        }

        dprintk("setting a DDS frequency offset of %c%dkHz", invert ? '-' : ' ', dds / unit_khz_dds_val);

        if (abs_offset_khz <= (state->cfg.pll->internal / ratio)) {
                /* Max dds offset is the half of the demod freq */
                dib8000_write_word(state, 26, invert);
                dib8000_write_word(state, 27, (u16)(dds >> 16) & 0x1ff);
                dib8000_write_word(state, 28, (u16)(dds & 0xffff));
        }
}

static void dib8000_set_frequency_offset(struct dib8000_state *state)
{
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        int i;
        u32 current_rf;
        int total_dds_offset_khz;

        if (state->fe[0]->ops.tuner_ops.get_frequency)
                state->fe[0]->ops.tuner_ops.get_frequency(state->fe[0], &current_rf);
        else
                current_rf = c->frequency;
        current_rf /= 1000;
        total_dds_offset_khz = (int)current_rf - (int)c->frequency / 1000;

        if (c->isdbt_sb_mode) {
                state->subchannel = c->isdbt_sb_subchannel;

                i = dib8000_read_word(state, 26) & 1; /* P_dds_invspec */
                dib8000_write_word(state, 26, c->inversion ^ i);

                if (state->cfg.pll->ifreq == 0) { /* low if tuner */
                        if ((c->inversion ^ i) == 0)
                                dib8000_write_word(state, 26, dib8000_read_word(state, 26) | 1);
                } else {
                        if ((c->inversion ^ i) == 0)
                                total_dds_offset_khz *= -1;
                }
        }

        dprintk("%dkhz tuner offset (frequency = %dHz & current_rf = %dHz) total_dds_offset_hz = %d", c->frequency - current_rf, c->frequency, current_rf, total_dds_offset_khz);

        /* apply dds offset now */
        dib8000_set_dds(state, total_dds_offset_khz);
}

static u16 LUT_isdbt_symbol_duration[4] = { 26, 101, 63 };

static u32 dib8000_get_symbol_duration(struct dib8000_state *state)
{
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        u16 i;

        switch (c->transmission_mode) {
        case TRANSMISSION_MODE_2K:
                        i = 0;
                        break;
        case TRANSMISSION_MODE_4K:
                        i = 2;
                        break;
        default:
        case TRANSMISSION_MODE_AUTO:
        case TRANSMISSION_MODE_8K:
                        i = 1;
                        break;
        }

        return (LUT_isdbt_symbol_duration[i] / (c->bandwidth_hz / 1000)) + 1;
}

static void dib8000_set_isdbt_loop_params(struct dib8000_state *state, enum param_loop_step loop_step)
{
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        u16 reg_32 = 0, reg_37 = 0;

        switch (loop_step) {
        case LOOP_TUNE_1:
                        if (c->isdbt_sb_mode)  {
                                if (c->isdbt_partial_reception == 0) {
                                        reg_32 = ((11 - state->mode) << 12) | (6 << 8) | 0x40; /* P_timf_alpha = (11-P_mode), P_corm_alpha=6, P_corm_thres=0x40 */
                                        reg_37 = (3 << 5) | (0 << 4) | (10 - state->mode); /* P_ctrl_pha_off_max=3   P_ctrl_sfreq_inh =0  P_ctrl_sfreq_step = (10-P_mode)  */
                                } else { /* Sound Broadcasting mode 3 seg */
                                        reg_32 = ((10 - state->mode) << 12) | (6 << 8) | 0x60; /* P_timf_alpha = (10-P_mode), P_corm_alpha=6, P_corm_thres=0x60 */
                                        reg_37 = (3 << 5) | (0 << 4) | (9 - state->mode); /* P_ctrl_pha_off_max=3   P_ctrl_sfreq_inh =0  P_ctrl_sfreq_step = (9-P_mode)  */
                                }
                        } else { /* 13-seg start conf offset loop parameters */
                                reg_32 = ((9 - state->mode) << 12) | (6 << 8) | 0x80; /* P_timf_alpha = (9-P_mode, P_corm_alpha=6, P_corm_thres=0x80 */
                                reg_37 = (3 << 5) | (0 << 4) | (8 - state->mode); /* P_ctrl_pha_off_max=3   P_ctrl_sfreq_inh =0  P_ctrl_sfreq_step = 9  */
                        }
                        break;
        case LOOP_TUNE_2:
                        if (c->isdbt_sb_mode)  {
                                if (c->isdbt_partial_reception == 0) {  /* Sound Broadcasting mode 1 seg */
                                        reg_32 = ((13-state->mode) << 12) | (6 << 8) | 0x40; /* P_timf_alpha = (13-P_mode) , P_corm_alpha=6, P_corm_thres=0x40*/
                                        reg_37 = (12-state->mode) | ((5 + state->mode) << 5);
                                } else {  /* Sound Broadcasting mode 3 seg */
                                        reg_32 = ((12-state->mode) << 12) | (6 << 8) | 0x60; /* P_timf_alpha = (12-P_mode) , P_corm_alpha=6, P_corm_thres=0x60 */
                                        reg_37 = (11-state->mode) | ((5 + state->mode) << 5);
                                }
                        } else {  /* 13 seg */
                                reg_32 = ((11-state->mode) << 12) | (6 << 8) | 0x80; /* P_timf_alpha = 8 , P_corm_alpha=6, P_corm_thres=0x80 */
                                reg_37 = ((5+state->mode) << 5) | (10 - state->mode);
                        }
                        break;
        }
        dib8000_write_word(state, 32, reg_32);
        dib8000_write_word(state, 37, reg_37);
}

static void dib8000_demod_restart(struct dib8000_state *state)
{
        dib8000_write_word(state, 770, 0x4000);
        dib8000_write_word(state, 770, 0x0000);
        return;
}

static void dib8000_set_sync_wait(struct dib8000_state *state)
{
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        u16 sync_wait = 64;

        /* P_dvsy_sync_wait - reuse mode */
        switch (c->transmission_mode) {
        case TRANSMISSION_MODE_8K:
                        sync_wait = 256;
                        break;
        case TRANSMISSION_MODE_4K:
                        sync_wait = 128;
                        break;
        default:
        case TRANSMISSION_MODE_2K:
                        sync_wait =  64;
                        break;
        }

        if (state->cfg.diversity_delay == 0)
                sync_wait = (sync_wait * (1 << (c->guard_interval)) * 3) / 2 + 48; /* add 50% SFN margin + compensate for one DVSY-fifo */
        else
                sync_wait = (sync_wait * (1 << (c->guard_interval)) * 3) / 2 + state->cfg.diversity_delay; /* add 50% SFN margin + compensate for DVSY-fifo */

        dib8000_write_word(state, 273, (dib8000_read_word(state, 273) & 0x000f) | (sync_wait << 4));
}

static unsigned long dib8000_get_timeout(struct dib8000_state *state, u32 delay, enum timeout_mode mode)
{
        if (mode == SYMBOL_DEPENDENT_ON)
                delay *= state->symbol_duration;

        return jiffies + usecs_to_jiffies(delay * 100);
}

static s32 dib8000_get_status(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        return state->status;
}

static enum frontend_tune_state dib8000_get_tune_state(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        return state->tune_state;
}

static int dib8000_set_tune_state(struct dvb_frontend *fe, enum frontend_tune_state tune_state)
{
        struct dib8000_state *state = fe->demodulator_priv;

        state->tune_state = tune_state;
        return 0;
}

static int dib8000_tune_restart_from_demod(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;

        state->status = FE_STATUS_TUNE_PENDING;
        state->tune_state = CT_DEMOD_START;
        return 0;
}

static u16 dib8000_read_lock(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;

        if (state->revision == 0x8090)
                return dib8000_read_word(state, 570);
        return dib8000_read_word(state, 568);
}

static int dib8090p_init_sdram(struct dib8000_state *state)
{
        u16 reg = 0;
        dprintk("init sdram");

        reg = dib8000_read_word(state, 274) & 0xfff0;
        dib8000_write_word(state, 274, reg | 0x7); /* P_dintlv_delay_ram = 7 because of MobileSdram */

        dib8000_write_word(state, 1803, (7 << 2));

        reg = dib8000_read_word(state, 1280);
        dib8000_write_word(state, 1280,  reg | (1 << 2)); /* force restart P_restart_sdram */
        dib8000_write_word(state, 1280,  reg); /* release restart P_restart_sdram */

        return 0;
}

/**
 * is_manual_mode - Check if TMCC should be used for parameters settings
 * @c:  struct dvb_frontend_properties
 *
 * By default, TMCC table should be used for parameter settings on most
 * usercases. However, sometimes it is desirable to lock the demod to
 * use the manual parameters.
 *
 * On manual mode, the current dib8000_tune state machine is very restrict:
 * It requires that both per-layer and per-transponder parameters to be
 * properly specified, otherwise the device won't lock.
 *
 * Check if all those conditions are properly satisfied before allowing
 * the device to use the manual frequency lock mode.
 */
static int is_manual_mode(struct dtv_frontend_properties *c)
{
        int i, n_segs = 0;

        /* Use auto mode on DVB-T compat mode */
        if (c->delivery_system != SYS_ISDBT)
                return 0;

        /*
         * Transmission mode is only detected on auto mode, currently
         */
        if (c->transmission_mode == TRANSMISSION_MODE_AUTO) {
                dprintk("transmission mode auto");
                return 0;
        }

        /*
         * Guard interval is only detected on auto mode, currently
         */
        if (c->guard_interval == GUARD_INTERVAL_AUTO) {
                dprintk("guard interval auto");
                return 0;
        }

        /*
         * If no layer is enabled, assume auto mode, as at least one
         * layer should be enabled
         */
        if (!c->isdbt_layer_enabled) {
                dprintk("no layer modulation specified");
                return 0;
        }

        /*
         * Check if the per-layer parameters aren't auto and
         * disable a layer if segment count is 0 or invalid.
         */
        for (i = 0; i < 3; i++) {
                if (!(c->isdbt_layer_enabled & 1 << i))
                        continue;

                if ((c->layer[i].segment_count > 13) ||
                    (c->layer[i].segment_count == 0)) {
                        c->isdbt_layer_enabled &= ~(1 << i);
                        continue;
                }

                n_segs += c->layer[i].segment_count;

                if ((c->layer[i].modulation == QAM_AUTO) ||
                    (c->layer[i].fec == FEC_AUTO)) {
                        dprintk("layer %c has either modulation or FEC auto",
                                'A' + i);
                        return 0;
                }
        }

        /*
         * Userspace specified a wrong number of segments.
         *      fallback to auto mode.
         */
        if (n_segs == 0 || n_segs > 13) {
                dprintk("number of segments is invalid");
                return 0;
        }

        /* Everything looks ok for manual mode */
        return 1;
}

static int dib8000_tune(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        enum frontend_tune_state *tune_state = &state->tune_state;

        u16 locks, deeper_interleaver = 0, i;
        int ret = 1; /* 1 symbol duration (in 100us unit) delay most of the time */

        unsigned long *timeout = &state->timeout;
        unsigned long now = jiffies;
#ifdef DIB8000_AGC_FREEZE
        u16 agc1, agc2;
#endif

        u32 corm[4] = {0, 0, 0, 0};
        u8 find_index, max_value;

#if 0
        if (*tune_state < CT_DEMOD_STOP)
                dprintk("IN: context status = %d, TUNE_STATE %d autosearch step = %u jiffies = %lu",
                        state->channel_parameters_set, *tune_state, state->autosearch_state, now);
#endif

        switch (*tune_state) {
        case CT_DEMOD_START: /* 30 */
                dib8000_reset_stats(fe);

                if (state->revision == 0x8090)
                        dib8090p_init_sdram(state);
                state->status = FE_STATUS_TUNE_PENDING;
                state->channel_parameters_set = is_manual_mode(c);

                dprintk("Tuning channel on %s search mode",
                        state->channel_parameters_set ? "manual" : "auto");

                dib8000_viterbi_state(state, 0); /* force chan dec in restart */

                /* Layer monitor */
                dib8000_write_word(state, 285, dib8000_read_word(state, 285) & 0x60);

                dib8000_set_frequency_offset(state);
                dib8000_set_bandwidth(fe, c->bandwidth_hz / 1000);

                if (state->channel_parameters_set == 0) { /* The channel struct is unknown, search it ! */
#ifdef DIB8000_AGC_FREEZE
                        if (state->revision != 0x8090) {
                                state->agc1_max = dib8000_read_word(state, 108);
                                state->agc1_min = dib8000_read_word(state, 109);
                                state->agc2_max = dib8000_read_word(state, 110);
                                state->agc2_min = dib8000_read_word(state, 111);
                                agc1 = dib8000_read_word(state, 388);
                                agc2 = dib8000_read_word(state, 389);
                                dib8000_write_word(state, 108, agc1);
                                dib8000_write_word(state, 109, agc1);
                                dib8000_write_word(state, 110, agc2);
                                dib8000_write_word(state, 111, agc2);
                        }
#endif
                        state->autosearch_state = AS_SEARCHING_FFT;
                        state->found_nfft = TRANSMISSION_MODE_AUTO;
                        state->found_guard = GUARD_INTERVAL_AUTO;
                        *tune_state = CT_DEMOD_SEARCH_NEXT;
                } else { /* we already know the channel struct so TUNE only ! */
                        state->autosearch_state = AS_DONE;
                        *tune_state = CT_DEMOD_STEP_3;
                }
                state->symbol_duration = dib8000_get_symbol_duration(state);
                break;

        case CT_DEMOD_SEARCH_NEXT: /* 51 */
                dib8000_autosearch_start(fe);
                if (state->revision == 0x8090)
                        ret = 50;
                else
                        ret = 15;
                *tune_state = CT_DEMOD_STEP_1;
                break;

        case CT_DEMOD_STEP_1: /* 31 */
                switch (dib8000_autosearch_irq(fe)) {
                case 1: /* fail */
                        state->status = FE_STATUS_TUNE_FAILED;
                        state->autosearch_state = AS_DONE;
                        *tune_state = CT_DEMOD_STOP; /* else we are done here */
                        break;
                case 2: /* Succes */
                        state->status = FE_STATUS_FFT_SUCCESS; /* signal to the upper layer, that there was a channel found and the parameters can be read */
                        *tune_state = CT_DEMOD_STEP_3;
                        if (state->autosearch_state == AS_SEARCHING_GUARD)
                                *tune_state = CT_DEMOD_STEP_2;
                        else
                                state->autosearch_state = AS_DONE;
                        break;
                case 3: /* Autosearch FFT max correlation endded */
                        *tune_state = CT_DEMOD_STEP_2;
                        break;
                }
                break;

        case CT_DEMOD_STEP_2:
                switch (state->autosearch_state) {
                case AS_SEARCHING_FFT:
                        /* searching for the correct FFT */
                        if (state->revision == 0x8090) {
                                corm[2] = (dib8000_read_word(state, 596) << 16) | (dib8000_read_word(state, 597));
                                corm[1] = (dib8000_read_word(state, 598) << 16) | (dib8000_read_word(state, 599));
                                corm[0] = (dib8000_read_word(state, 600) << 16) | (dib8000_read_word(state, 601));
                        } else {
                                corm[2] = (dib8000_read_word(state, 594) << 16) | (dib8000_read_word(state, 595));
                                corm[1] = (dib8000_read_word(state, 596) << 16) | (dib8000_read_word(state, 597));
                                corm[0] = (dib8000_read_word(state, 598) << 16) | (dib8000_read_word(state, 599));
                        }
                        /* dprintk("corm fft: %u %u %u", corm[0], corm[1], corm[2]); */

                        max_value = 0;
                        for (find_index = 1 ; find_index < 3 ; find_index++) {
                                if (corm[max_value] < corm[find_index])
                                        max_value = find_index ;
                        }

                        switch (max_value) {
                        case 0:
                                state->found_nfft = TRANSMISSION_MODE_2K;
                                break;
                        case 1:
                                state->found_nfft = TRANSMISSION_MODE_4K;
                                break;
                        case 2:
                        default:
                                state->found_nfft = TRANSMISSION_MODE_8K;
                                break;
                        }
                        /* dprintk("Autosearch FFT has found Mode %d", max_value + 1); */

                        *tune_state = CT_DEMOD_SEARCH_NEXT;
                        state->autosearch_state = AS_SEARCHING_GUARD;
                        if (state->revision == 0x8090)
                                ret = 50;
                        else
                                ret = 10;
                        break;
                case AS_SEARCHING_GUARD:
                        /* searching for the correct guard interval */
                        if (state->revision == 0x8090)
                                state->found_guard = dib8000_read_word(state, 572) & 0x3;
                        else
                                state->found_guard = dib8000_read_word(state, 570) & 0x3;
                        /* dprintk("guard interval found=%i", state->found_guard); */

                        *tune_state = CT_DEMOD_STEP_3;
                        break;
                default:
                        /* the demod should never be in this state */
                        state->status = FE_STATUS_TUNE_FAILED;
                        state->autosearch_state = AS_DONE;
                        *tune_state = CT_DEMOD_STOP; /* else we are done here */
                        break;
                }
                break;

        case CT_DEMOD_STEP_3: /* 33 */
                dib8000_set_isdbt_loop_params(state, LOOP_TUNE_1);
                dib8000_set_isdbt_common_channel(state, 0, 0);/* setting the known channel parameters here */
                *tune_state = CT_DEMOD_STEP_4;
                break;

        case CT_DEMOD_STEP_4: /* (34) */
                dib8000_demod_restart(state);

                dib8000_set_sync_wait(state);
                dib8000_set_diversity_in(state->fe[0], state->diversity_onoff);

                locks = (dib8000_read_word(state, 180) >> 6) & 0x3f; /* P_coff_winlen ? */
                /* coff should lock over P_coff_winlen ofdm symbols : give 3 times this length to lock */
                *timeout = dib8000_get_timeout(state, 2 * locks, SYMBOL_DEPENDENT_ON);
                *tune_state = CT_DEMOD_STEP_5;
                break;

        case CT_DEMOD_STEP_5: /* (35) */
                locks = dib8000_read_lock(fe);
                if (locks & (0x3 << 11)) { /* coff-lock and off_cpil_lock achieved */
                        dib8000_update_timf(state); /* we achieved a coff_cpil_lock - it's time to update the timf */
                        if (!state->differential_constellation) {
                                /* 2 times lmod4_win_len + 10 symbols (pipe delay after coff + nb to compute a 1st correlation) */
                                *timeout = dib8000_get_timeout(state, (20 * ((dib8000_read_word(state, 188)>>5)&0x1f)), SYMBOL_DEPENDENT_ON);
                                *tune_state = CT_DEMOD_STEP_7;
                        } else {
                                *tune_state = CT_DEMOD_STEP_8;
                        }
                } else if (time_after(now, *timeout)) {
                        *tune_state = CT_DEMOD_STEP_6; /* goto check for diversity input connection */
                }
                break;

        case CT_DEMOD_STEP_6: /* (36)  if there is an input (diversity) */
                if ((state->fe[1] != NULL) && (state->output_mode != OUTMODE_DIVERSITY)) {
                        /* if there is a diversity fe in input and this fe is has not already failled : wait here until this this fe has succedeed or failled */
                        if (dib8000_get_status(state->fe[1]) <= FE_STATUS_STD_SUCCESS) /* Something is locked on the input fe */
                                *tune_state = CT_DEMOD_STEP_8; /* go for mpeg */
                        else if (dib8000_get_status(state->fe[1]) >= FE_STATUS_TUNE_TIME_TOO_SHORT) { /* fe in input failled also, break the current one */
                                *tune_state = CT_DEMOD_STOP; /* else we are done here ; step 8 will close the loops and exit */
                                dib8000_viterbi_state(state, 1); /* start viterbi chandec */
                                dib8000_set_isdbt_loop_params(state, LOOP_TUNE_2);
                                state->status = FE_STATUS_TUNE_FAILED;
                        }
                } else {
                        dib8000_viterbi_state(state, 1); /* start viterbi chandec */
                        dib8000_set_isdbt_loop_params(state, LOOP_TUNE_2);
                        *tune_state = CT_DEMOD_STOP; /* else we are done here ; step 8 will close the loops and exit */
                        state->status = FE_STATUS_TUNE_FAILED;
                }
                break;

        case CT_DEMOD_STEP_7: /* 37 */
                locks = dib8000_read_lock(fe);
                if (locks & (1<<10)) { /* lmod4_lock */
                        ret = 14; /* wait for 14 symbols */
                        *tune_state = CT_DEMOD_STEP_8;
                } else if (time_after(now, *timeout))
                        *tune_state = CT_DEMOD_STEP_6; /* goto check for diversity input connection */
                break;

        case CT_DEMOD_STEP_8: /* 38 */
                dib8000_viterbi_state(state, 1); /* start viterbi chandec */
                dib8000_set_isdbt_loop_params(state, LOOP_TUNE_2);

                /* mpeg will never lock on this condition because init_prbs is not set : search for it !*/
                if (c->isdbt_sb_mode
                    && c->isdbt_sb_subchannel < 14
                    && !state->differential_constellation) {
                        state->subchannel = 0;
                        *tune_state = CT_DEMOD_STEP_11;
                } else {
                        *tune_state = CT_DEMOD_STEP_9;
                        state->status = FE_STATUS_LOCKED;
                }
                break;

        case CT_DEMOD_STEP_9: /* 39 */
                if ((state->revision == 0x8090) || ((dib8000_read_word(state, 1291) >> 9) & 0x1)) { /* fe capable of deinterleaving : esram */
                        /* defines timeout for mpeg lock depending on interleaver length of longest layer */
                        for (i = 0; i < 3; i++) {
                                if (c->layer[i].interleaving >= deeper_interleaver) {
                                        dprintk("layer%i: time interleaver = %d ", i, c->layer[i].interleaving);
                                        if (c->layer[i].segment_count > 0) { /* valid layer */
                                                deeper_interleaver = c->layer[0].interleaving;
                                                state->longest_intlv_layer = i;
                                        }
                                }
                        }

                        if (deeper_interleaver == 0)
                                locks = 2; /* locks is the tmp local variable name */
                        else if (deeper_interleaver == 3)
                                locks = 8;
                        else
                                locks = 2 * deeper_interleaver;

                        if (state->diversity_onoff != 0) /* because of diversity sync */
                                locks *= 2;

                        *timeout = now + msecs_to_jiffies(200 * locks); /* give the mpeg lock 800ms if sram is present */
                        dprintk("Deeper interleaver mode = %d on layer %d : timeout mult factor = %d => will use timeout = %ld",
                                deeper_interleaver, state->longest_intlv_layer, locks, *timeout);

                        *tune_state = CT_DEMOD_STEP_10;
                } else
                        *tune_state = CT_DEMOD_STOP;
                break;

        case CT_DEMOD_STEP_10: /* 40 */
                locks = dib8000_read_lock(fe);
                if (locks&(1<<(7-state->longest_intlv_layer))) { /* mpeg lock : check the longest one */
                        dprintk("ISDB-T layer locks: Layer A %s, Layer B %s, Layer C %s",
                                c->layer[0].segment_count ? (locks >> 7) & 0x1 ? "locked" : "NOT LOCKED" : "not enabled",
                                c->layer[1].segment_count ? (locks >> 6) & 0x1 ? "locked" : "NOT LOCKED" : "not enabled",
                                c->layer[2].segment_count ? (locks >> 5) & 0x1 ? "locked" : "NOT LOCKED" : "not enabled");
                        if (c->isdbt_sb_mode
                            && c->isdbt_sb_subchannel < 14
                            && !state->differential_constellation)
                                /* signal to the upper layer, that there was a channel found and the parameters can be read */
                                state->status = FE_STATUS_DEMOD_SUCCESS;
                        else
                                state->status = FE_STATUS_DATA_LOCKED;
                        *tune_state = CT_DEMOD_STOP;
                } else if (time_after(now, *timeout)) {
                        if (c->isdbt_sb_mode
                            && c->isdbt_sb_subchannel < 14
                            && !state->differential_constellation) { /* continue to try init prbs autosearch */
                                state->subchannel += 3;
                                *tune_state = CT_DEMOD_STEP_11;
                        } else { /* we are done mpeg of the longest interleaver xas not locking but let's try if an other layer has locked in the same time */
                                if (locks & (0x7 << 5)) {
                                        dprintk("Not all ISDB-T layers locked in %d ms: Layer A %s, Layer B %s, Layer C %s",
                                                jiffies_to_msecs(now - *timeout),
                                                c->layer[0].segment_count ? (locks >> 7) & 0x1 ? "locked" : "NOT LOCKED" : "not enabled",
                                                c->layer[1].segment_count ? (locks >> 6) & 0x1 ? "locked" : "NOT LOCKED" : "not enabled",
                                                c->layer[2].segment_count ? (locks >> 5) & 0x1 ? "locked" : "NOT LOCKED" : "not enabled");

                                        state->status = FE_STATUS_DATA_LOCKED;
                                } else
                                        state->status = FE_STATUS_TUNE_FAILED;
                                *tune_state = CT_DEMOD_STOP;
                        }
                }
                break;

        case CT_DEMOD_STEP_11:  /* 41 : init prbs autosearch */
                if (state->subchannel <= 41) {
                        dib8000_set_subchannel_prbs(state, dib8000_get_init_prbs(state, state->subchannel));
                        *tune_state = CT_DEMOD_STEP_9;
                } else {
                        *tune_state = CT_DEMOD_STOP;
                        state->status = FE_STATUS_TUNE_FAILED;
                }
                break;

        default:
                break;
        }

        /* tuning is finished - cleanup the demod */
        switch (*tune_state) {
        case CT_DEMOD_STOP: /* (42) */
#ifdef DIB8000_AGC_FREEZE
                if ((state->revision != 0x8090) && (state->agc1_max != 0)) {
                        dib8000_write_word(state, 108, state->agc1_max);
                        dib8000_write_word(state, 109, state->agc1_min);
                        dib8000_write_word(state, 110, state->agc2_max);
                        dib8000_write_word(state, 111, state->agc2_min);
                        state->agc1_max = 0;
                        state->agc1_min = 0;
                        state->agc2_max = 0;
                        state->agc2_min = 0;
                }
#endif
                ret = 0;
                break;
        default:
                break;
        }

        if ((ret > 0) && (*tune_state > CT_DEMOD_STEP_3))
                return ret * state->symbol_duration;
        if ((ret > 0) && (ret < state->symbol_duration))
                return state->symbol_duration; /* at least one symbol */
        return ret;
}

static int dib8000_wakeup(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u8 index_frontend;
        int ret;

        dib8000_set_power_mode(state, DIB8000_POWER_ALL);
        dib8000_set_adc_state(state, DIBX000_ADC_ON);
        if (dib8000_set_adc_state(state, DIBX000_SLOW_ADC_ON) != 0)
                dprintk("could not start Slow ADC");

        if (state->revision == 0x8090)
                dib8000_sad_calib(state);

        for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                ret = state->fe[index_frontend]->ops.init(state->fe[index_frontend]);
                if (ret < 0)
                        return ret;
        }

        return 0;
}

static int dib8000_sleep(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u8 index_frontend;
        int ret;

        for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                ret = state->fe[index_frontend]->ops.sleep(state->fe[index_frontend]);
                if (ret < 0)
                        return ret;
        }

        if (state->revision != 0x8090)
                dib8000_set_output_mode(fe, OUTMODE_HIGH_Z);
        dib8000_set_power_mode(state, DIB8000_POWER_INTERFACE_ONLY);
        return dib8000_set_adc_state(state, DIBX000_SLOW_ADC_OFF) | dib8000_set_adc_state(state, DIBX000_ADC_OFF);
}

static int dib8000_read_status(struct dvb_frontend *fe, enum fe_status *stat);

static int dib8000_get_frontend(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 i, val = 0;
        enum fe_status stat = 0;
        u8 index_frontend, sub_index_frontend;

        fe->dtv_property_cache.bandwidth_hz = 6000000;

        /*
         * If called to early, get_frontend makes dib8000_tune to either
         * not lock or not sync. This causes dvbv5-scan/dvbv5-zap to fail.
         * So, let's just return if frontend 0 has not locked.
         */
        dib8000_read_status(fe, &stat);
        if (!(stat & FE_HAS_SYNC))
                return 0;

        dprintk("dib8000_get_frontend: TMCC lock");
        for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                state->fe[index_frontend]->ops.read_status(state->fe[index_frontend], &stat);
                if (stat&FE_HAS_SYNC) {
                        dprintk("TMCC lock on the slave%i", index_frontend);
                        /* synchronize the cache with the other frontends */
                        state->fe[index_frontend]->ops.get_frontend(state->fe[index_frontend]);
                        for (sub_index_frontend = 0; (sub_index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[sub_index_frontend] != NULL); sub_index_frontend++) {
                                if (sub_index_frontend != index_frontend) {
                                        state->fe[sub_index_frontend]->dtv_property_cache.isdbt_sb_mode = state->fe[index_frontend]->dtv_property_cache.isdbt_sb_mode;
                                        state->fe[sub_index_frontend]->dtv_property_cache.inversion = state->fe[index_frontend]->dtv_property_cache.inversion;
                                        state->fe[sub_index_frontend]->dtv_property_cache.transmission_mode = state->fe[index_frontend]->dtv_property_cache.transmission_mode;
                                        state->fe[sub_index_frontend]->dtv_property_cache.guard_interval = state->fe[index_frontend]->dtv_property_cache.guard_interval;
                                        state->fe[sub_index_frontend]->dtv_property_cache.isdbt_partial_reception = state->fe[index_frontend]->dtv_property_cache.isdbt_partial_reception;
                                        for (i = 0; i < 3; i++) {
                                                state->fe[sub_index_frontend]->dtv_property_cache.layer[i].segment_count = state->fe[index_frontend]->dtv_property_cache.layer[i].segment_count;
                                                state->fe[sub_index_frontend]->dtv_property_cache.layer[i].interleaving = state->fe[index_frontend]->dtv_property_cache.layer[i].interleaving;
                                                state->fe[sub_index_frontend]->dtv_property_cache.layer[i].fec = state->fe[index_frontend]->dtv_property_cache.layer[i].fec;
                                                state->fe[sub_index_frontend]->dtv_property_cache.layer[i].modulation = state->fe[index_frontend]->dtv_property_cache.layer[i].modulation;
                                        }
                                }
                        }
                        return 0;
                }
        }

        fe->dtv_property_cache.isdbt_sb_mode = dib8000_read_word(state, 508) & 0x1;

        if (state->revision == 0x8090)
                val = dib8000_read_word(state, 572);
        else
                val = dib8000_read_word(state, 570);
        fe->dtv_property_cache.inversion = (val & 0x40) >> 6;
        switch ((val & 0x30) >> 4) {
        case 1:
                fe->dtv_property_cache.transmission_mode = TRANSMISSION_MODE_2K;
                dprintk("dib8000_get_frontend: transmission mode 2K");
                break;
        case 2:
                fe->dtv_property_cache.transmission_mode = TRANSMISSION_MODE_4K;
                dprintk("dib8000_get_frontend: transmission mode 4K");
                break;
        case 3:
        default:
                fe->dtv_property_cache.transmission_mode = TRANSMISSION_MODE_8K;
                dprintk("dib8000_get_frontend: transmission mode 8K");
                break;
        }

        switch (val & 0x3) {
        case 0:
                fe->dtv_property_cache.guard_interval = GUARD_INTERVAL_1_32;
                dprintk("dib8000_get_frontend: Guard Interval = 1/32 ");
                break;
        case 1:
                fe->dtv_property_cache.guard_interval = GUARD_INTERVAL_1_16;
                dprintk("dib8000_get_frontend: Guard Interval = 1/16 ");
                break;
        case 2:
                dprintk("dib8000_get_frontend: Guard Interval = 1/8 ");
                fe->dtv_property_cache.guard_interval = GUARD_INTERVAL_1_8;
                break;
        case 3:
                dprintk("dib8000_get_frontend: Guard Interval = 1/4 ");
                fe->dtv_property_cache.guard_interval = GUARD_INTERVAL_1_4;
                break;
        }

        val = dib8000_read_word(state, 505);
        fe->dtv_property_cache.isdbt_partial_reception = val & 1;
        dprintk("dib8000_get_frontend: partial_reception = %d ", fe->dtv_property_cache.isdbt_partial_reception);

        for (i = 0; i < 3; i++) {
                int show;

                val = dib8000_read_word(state, 493 + i) & 0x0f;
                fe->dtv_property_cache.layer[i].segment_count = val;

                if (val == 0 || val > 13)
                        show = 0;
                else
                        show = 1;

                if (show)
                        dprintk("dib8000_get_frontend: Layer %d segments = %d ",
                                i, fe->dtv_property_cache.layer[i].segment_count);

                val = dib8000_read_word(state, 499 + i) & 0x3;
                /* Interleaving can be 0, 1, 2 or 4 */
                if (val == 3)
                        val = 4;
                fe->dtv_property_cache.layer[i].interleaving = val;
                if (show)
                        dprintk("dib8000_get_frontend: Layer %d time_intlv = %d ",
                                i, fe->dtv_property_cache.layer[i].interleaving);

                val = dib8000_read_word(state, 481 + i);
                switch (val & 0x7) {
                case 1:
                        fe->dtv_property_cache.layer[i].fec = FEC_1_2;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d Code Rate = 1/2 ", i);
                        break;
                case 2:
                        fe->dtv_property_cache.layer[i].fec = FEC_2_3;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d Code Rate = 2/3 ", i);
                        break;
                case 3:
                        fe->dtv_property_cache.layer[i].fec = FEC_3_4;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d Code Rate = 3/4 ", i);
                        break;
                case 5:
                        fe->dtv_property_cache.layer[i].fec = FEC_5_6;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d Code Rate = 5/6 ", i);
                        break;
                default:
                        fe->dtv_property_cache.layer[i].fec = FEC_7_8;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d Code Rate = 7/8 ", i);
                        break;
                }

                val = dib8000_read_word(state, 487 + i);
                switch (val & 0x3) {
                case 0:
                        fe->dtv_property_cache.layer[i].modulation = DQPSK;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d DQPSK ", i);
                        break;
                case 1:
                        fe->dtv_property_cache.layer[i].modulation = QPSK;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d QPSK ", i);
                        break;
                case 2:
                        fe->dtv_property_cache.layer[i].modulation = QAM_16;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d QAM16 ", i);
                        break;
                case 3:
                default:
                        fe->dtv_property_cache.layer[i].modulation = QAM_64;
                        if (show)
                                dprintk("dib8000_get_frontend: Layer %d QAM64 ", i);
                        break;
                }
        }

        /* synchronize the cache with the other frontends */
        for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                state->fe[index_frontend]->dtv_property_cache.isdbt_sb_mode = fe->dtv_property_cache.isdbt_sb_mode;
                state->fe[index_frontend]->dtv_property_cache.inversion = fe->dtv_property_cache.inversion;
                state->fe[index_frontend]->dtv_property_cache.transmission_mode = fe->dtv_property_cache.transmission_mode;
                state->fe[index_frontend]->dtv_property_cache.guard_interval = fe->dtv_property_cache.guard_interval;
                state->fe[index_frontend]->dtv_property_cache.isdbt_partial_reception = fe->dtv_property_cache.isdbt_partial_reception;
                for (i = 0; i < 3; i++) {
                        state->fe[index_frontend]->dtv_property_cache.layer[i].segment_count = fe->dtv_property_cache.layer[i].segment_count;
                        state->fe[index_frontend]->dtv_property_cache.layer[i].interleaving = fe->dtv_property_cache.layer[i].interleaving;
                        state->fe[index_frontend]->dtv_property_cache.layer[i].fec = fe->dtv_property_cache.layer[i].fec;
                        state->fe[index_frontend]->dtv_property_cache.layer[i].modulation = fe->dtv_property_cache.layer[i].modulation;
                }
        }
        return 0;
}

static int dib8000_set_frontend(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        int l, i, active, time, time_slave = 0;
        u8 exit_condition, index_frontend;
        unsigned long delay, callback_time;

        if (c->frequency == 0) {
                dprintk("dib8000: must at least specify frequency ");
                return 0;
        }

        if (c->bandwidth_hz == 0) {
                dprintk("dib8000: no bandwidth specified, set to default ");
                c->bandwidth_hz = 6000000;
        }

        for (index_frontend = 0; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                /* synchronization of the cache */
                state->fe[index_frontend]->dtv_property_cache.delivery_system = SYS_ISDBT;
                memcpy(&state->fe[index_frontend]->dtv_property_cache, &fe->dtv_property_cache, sizeof(struct dtv_frontend_properties));

                /* set output mode and diversity input */
                if (state->revision != 0x8090) {
                        dib8000_set_diversity_in(state->fe[index_frontend], 1);
                        if (index_frontend != 0)
                                dib8000_set_output_mode(state->fe[index_frontend],
                                                OUTMODE_DIVERSITY);
                        else
                                dib8000_set_output_mode(state->fe[0], OUTMODE_HIGH_Z);
                } else {
                        dib8096p_set_diversity_in(state->fe[index_frontend], 1);
                        if (index_frontend != 0)
                                dib8096p_set_output_mode(state->fe[index_frontend],
                                                OUTMODE_DIVERSITY);
                        else
                                dib8096p_set_output_mode(state->fe[0], OUTMODE_HIGH_Z);
                }

                /* tune the tuner */
                if (state->fe[index_frontend]->ops.tuner_ops.set_params)
                        state->fe[index_frontend]->ops.tuner_ops.set_params(state->fe[index_frontend]);

                dib8000_set_tune_state(state->fe[index_frontend], CT_AGC_START);
        }

        /* turn off the diversity of the last chip */
        if (state->revision != 0x8090)
                dib8000_set_diversity_in(state->fe[index_frontend - 1], 0);
        else
                dib8096p_set_diversity_in(state->fe[index_frontend - 1], 0);

        /* start up the AGC */
        do {
                time = dib8000_agc_startup(state->fe[0]);
                for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                        time_slave = dib8000_agc_startup(state->fe[index_frontend]);
                        if (time == 0)
                                time = time_slave;
                        else if ((time_slave != 0) && (time_slave > time))
                                time = time_slave;
                }
                if (time == 0)
                        break;

                /*
                 * Despite dib8000_agc_startup returns time at a 0.1 ms range,
                 * the actual sleep time depends on CONFIG_HZ. The worse case
                 * is when CONFIG_HZ=100. In such case, the minimum granularity
                 * is 10ms. On some real field tests, the tuner sometimes don't
                 * lock when this timer is lower than 10ms. So, enforce a 10ms
                 * granularity.
                 */
                time = 10 * (time + 99)/100;
                usleep_range(time * 1000, (time + 1) * 1000);
                exit_condition = 1;
                for (index_frontend = 0; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                        if (dib8000_get_tune_state(state->fe[index_frontend]) != CT_AGC_STOP) {
                                exit_condition = 0;
                                break;
                        }
                }
        } while (exit_condition == 0);

        for (index_frontend = 0; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++)
                dib8000_set_tune_state(state->fe[index_frontend], CT_DEMOD_START);

        active = 1;
        do {
                callback_time = 0;
                for (index_frontend = 0; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                        delay = dib8000_tune(state->fe[index_frontend]);
                        if (delay != 0) {
                                delay = jiffies + usecs_to_jiffies(100 * delay);
                                if (!callback_time || delay < callback_time)
                                        callback_time = delay;
                        }

                        /* we are in autosearch */
                        if (state->channel_parameters_set == 0) { /* searching */
                                if ((dib8000_get_status(state->fe[index_frontend]) == FE_STATUS_DEMOD_SUCCESS) || (dib8000_get_status(state->fe[index_frontend]) == FE_STATUS_FFT_SUCCESS)) {
                                        dprintk("autosearch succeeded on fe%i", index_frontend);
                                        dib8000_get_frontend(state->fe[index_frontend]); /* we read the channel parameters from the frontend which was successful */
                                        state->channel_parameters_set = 1;

                                        for (l = 0; (l < MAX_NUMBER_OF_FRONTENDS) && (state->fe[l] != NULL); l++) {
                                                if (l != index_frontend) { /* and for all frontend except the successful one */
                                                        dprintk("Restarting frontend %d\n", l);
                                                        dib8000_tune_restart_from_demod(state->fe[l]);

                                                        state->fe[l]->dtv_property_cache.isdbt_sb_mode = state->fe[index_frontend]->dtv_property_cache.isdbt_sb_mode;
                                                        state->fe[l]->dtv_property_cache.inversion = state->fe[index_frontend]->dtv_property_cache.inversion;
                                                        state->fe[l]->dtv_property_cache.transmission_mode = state->fe[index_frontend]->dtv_property_cache.transmission_mode;
                                                        state->fe[l]->dtv_property_cache.guard_interval = state->fe[index_frontend]->dtv_property_cache.guard_interval;
                                                        state->fe[l]->dtv_property_cache.isdbt_partial_reception = state->fe[index_frontend]->dtv_property_cache.isdbt_partial_reception;
                                                        for (i = 0; i < 3; i++) {
                                                                state->fe[l]->dtv_property_cache.layer[i].segment_count = state->fe[index_frontend]->dtv_property_cache.layer[i].segment_count;
                                                                state->fe[l]->dtv_property_cache.layer[i].interleaving = state->fe[index_frontend]->dtv_property_cache.layer[i].interleaving;
                                                                state->fe[l]->dtv_property_cache.layer[i].fec = state->fe[index_frontend]->dtv_property_cache.layer[i].fec;
                                                                state->fe[l]->dtv_property_cache.layer[i].modulation = state->fe[index_frontend]->dtv_property_cache.layer[i].modulation;
                                                        }

                                                }
                                        }
                                }
                        }
                }
                /* tuning is done when the master frontend is done (failed or success) */
                if (dib8000_get_status(state->fe[0]) == FE_STATUS_TUNE_FAILED ||
                                dib8000_get_status(state->fe[0]) == FE_STATUS_LOCKED ||
                                dib8000_get_status(state->fe[0]) == FE_STATUS_DATA_LOCKED) {
                        active = 0;
                        /* we need to wait for all frontends to be finished */
                        for (index_frontend = 0; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                                if (dib8000_get_tune_state(state->fe[index_frontend]) != CT_DEMOD_STOP)
                                        active = 1;
                        }
                        if (active == 0)
                                dprintk("tuning done with status %d", dib8000_get_status(state->fe[0]));
                }

                if ((active == 1) && (callback_time == 0)) {
                        dprintk("strange callback time something went wrong");
                        active = 0;
                }

                while ((active == 1) && (time_before(jiffies, callback_time)))
                        msleep(100);
        } while (active);

        /* set output mode */
        if (state->revision != 0x8090)
                dib8000_set_output_mode(state->fe[0], state->cfg.output_mode);
        else {
                dib8096p_set_output_mode(state->fe[0], state->cfg.output_mode);
                if (state->cfg.enMpegOutput == 0) {
                        dib8096p_setDibTxMux(state, MPEG_ON_DIBTX);
                        dib8096p_setHostBusMux(state, DIBTX_ON_HOSTBUS);
                }
        }

        return 0;
}

static int dib8000_get_stats(struct dvb_frontend *fe, enum fe_status stat);

static int dib8000_read_status(struct dvb_frontend *fe, enum fe_status *stat)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u16 lock_slave = 0, lock;
        u8 index_frontend;

        lock = dib8000_read_lock(fe);
        for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++)
                lock_slave |= dib8000_read_lock(state->fe[index_frontend]);

        *stat = 0;

        if (((lock >> 13) & 1) || ((lock_slave >> 13) & 1))
                *stat |= FE_HAS_SIGNAL;

        if (((lock >> 8) & 1) || ((lock_slave >> 8) & 1)) /* Equal */
                *stat |= FE_HAS_CARRIER;

        if ((((lock >> 1) & 0xf) == 0xf) || (((lock_slave >> 1) & 0xf) == 0xf)) /* TMCC_SYNC */
                *stat |= FE_HAS_SYNC;

        if ((((lock >> 12) & 1) || ((lock_slave >> 12) & 1)) && ((lock >> 5) & 7)) /* FEC MPEG */
                *stat |= FE_HAS_LOCK;

        if (((lock >> 12) & 1) || ((lock_slave >> 12) & 1)) {
                lock = dib8000_read_word(state, 554); /* Viterbi Layer A */
                if (lock & 0x01)
                        *stat |= FE_HAS_VITERBI;

                lock = dib8000_read_word(state, 555); /* Viterbi Layer B */
                if (lock & 0x01)
                        *stat |= FE_HAS_VITERBI;

                lock = dib8000_read_word(state, 556); /* Viterbi Layer C */
                if (lock & 0x01)
                        *stat |= FE_HAS_VITERBI;
        }
        dib8000_get_stats(fe, *stat);

        return 0;
}

static int dib8000_read_ber(struct dvb_frontend *fe, u32 * ber)
{
        struct dib8000_state *state = fe->demodulator_priv;

        /* 13 segments */
        if (state->revision == 0x8090)
                *ber = (dib8000_read_word(state, 562) << 16) |
                        dib8000_read_word(state, 563);
        else
                *ber = (dib8000_read_word(state, 560) << 16) |
                        dib8000_read_word(state, 561);
        return 0;
}

static int dib8000_read_unc_blocks(struct dvb_frontend *fe, u32 * unc)
{
        struct dib8000_state *state = fe->demodulator_priv;

        /* packet error on 13 seg */
        if (state->revision == 0x8090)
                *unc = dib8000_read_word(state, 567);
        else
                *unc = dib8000_read_word(state, 565);
        return 0;
}

static int dib8000_read_signal_strength(struct dvb_frontend *fe, u16 * strength)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u8 index_frontend;
        u16 val;

        *strength = 0;
        for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++) {
                state->fe[index_frontend]->ops.read_signal_strength(state->fe[index_frontend], &val);
                if (val > 65535 - *strength)
                        *strength = 65535;
                else
                        *strength += val;
        }

        val = 65535 - dib8000_read_word(state, 390);
        if (val > 65535 - *strength)
                *strength = 65535;
        else
                *strength += val;
        return 0;
}

static u32 dib8000_get_snr(struct dvb_frontend *fe)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u32 n, s, exp;
        u16 val;

        if (state->revision != 0x8090)
                val = dib8000_read_word(state, 542);
        else
                val = dib8000_read_word(state, 544);
        n = (val >> 6) & 0xff;
        exp = (val & 0x3f);
        if ((exp & 0x20) != 0)
                exp -= 0x40;
        n <<= exp+16;

        if (state->revision != 0x8090)
                val = dib8000_read_word(state, 543);
        else
                val = dib8000_read_word(state, 545);
        s = (val >> 6) & 0xff;
        exp = (val & 0x3f);
        if ((exp & 0x20) != 0)
                exp -= 0x40;
        s <<= exp+16;

        if (n > 0) {
                u32 t = (s/n) << 16;
                return t + ((s << 16) - n*t) / n;
        }
        return 0xffffffff;
}

static int dib8000_read_snr(struct dvb_frontend *fe, u16 * snr)
{
        struct dib8000_state *state = fe->demodulator_priv;
        u8 index_frontend;
        u32 snr_master;

        snr_master = dib8000_get_snr(fe);
        for (index_frontend = 1; (index_frontend < MAX_NUMBER_OF_FRONTENDS) && (state->fe[index_frontend] != NULL); index_frontend++)
                snr_master += dib8000_get_snr(state->fe[index_frontend]);

        if ((snr_master >> 16) != 0) {
                snr_master = 10*intlog10(snr_master>>16);
                *snr = snr_master / ((1 << 24) / 10);
        }
        else
                *snr = 0;

        return 0;
}

struct per_layer_regs {
        u16 lock, ber, per;
};

static const struct per_layer_regs per_layer_regs[] = {
        { 554, 560, 562 },
        { 555, 576, 578 },
        { 556, 581, 583 },
};

struct linear_segments {
        unsigned x;
        signed y;
};

/*
 * Table to estimate signal strength in dBm.
 * This table was empirically determinated by measuring the signal
 * strength generated by a DTA-2111 RF generator directly connected into
 * a dib8076 device (a PixelView PV-D231U stick), using a good quality
 * 3 meters RC6 cable and good RC6 connectors.
 * The real value can actually be different on other devices, depending
 * on several factors, like if LNA is enabled or not, if diversity is
 * enabled, type of connectors, etc.
 * Yet, it is better to use this measure in dB than a random non-linear
 * percentage value, especially for antenna adjustments.
 * On my tests, the precision of the measure using this table is about
 * 0.5 dB, with sounds reasonable enough.
 */
static struct linear_segments strength_to_db_table[] = {
        { 55953, 108500 },      /* -22.5 dBm */
        { 55394, 108000 },
        { 53834, 107000 },
        { 52863, 106000 },
        { 52239, 105000 },
        { 52012, 104000 },
        { 51803, 103000 },
        { 51566, 102000 },
        { 51356, 101000 },
        { 51112, 100000 },
        { 50869,  99000 },
        { 50600,  98000 },
        { 50363,  97000 },
        { 50117,  96000 },      /* -35 dBm */
        { 49889,  95000 },
        { 49680,  94000 },
        { 49493,  93000 },
        { 49302,  92000 },
        { 48929,  91000 },
        { 48416,  90000 },
        { 48035,  89000 },
        { 47593,  88000 },
        { 47282,  87000 },
        { 46953,  86000 },
        { 46698,  85000 },
        { 45617,  84000 },
        { 44773,  83000 },
        { 43845,  82000 },
        { 43020,  81000 },
        { 42010,  80000 },      /* -51 dBm */
        {     0,      0 },
};

static u32 interpolate_value(u32 value, struct linear_segments *segments,
                             unsigned len)
{
        u64 tmp64;
        u32 dx;
        s32 dy;
        int i, ret;

        if (value >= segments[0].x)
                return segments[0].y;
        if (value < segments[len-1].x)
                return segments[len-1].y;

        for (i = 1; i < len - 1; i++) {
                /* If value is identical, no need to interpolate */
                if (value == segments[i].x)
                        return segments[i].y;
                if (value > segments[i].x)
                        break;
        }

        /* Linear interpolation between the two (x,y) points */
        dy = segments[i - 1].y - segments[i].y;
        dx = segments[i - 1].x - segments[i].x;

        tmp64 = value - segments[i].x;
        tmp64 *= dy;
        do_div(tmp64, dx);
        ret = segments[i].y + tmp64;

        return ret;
}

static u32 dib8000_get_time_us(struct dvb_frontend *fe, int layer)
{
        struct dib8000_state *state = fe->demodulator_priv;
        struct dtv_frontend_properties *c = &state->fe[0]->dtv_property_cache;
        int ini_layer, end_layer, i;
        u64 time_us, tmp64;
        u32 tmp, denom;
        int guard, rate_num, rate_denum = 1, bits_per_symbol, nsegs;
        int interleaving = 0, fft_div;

        if (layer >= 0) {
                ini_layer = layer;
                end_layer = layer + 1;
        } else {
                ini_layer = 0;
                end_layer = 3;
        }

        switch (c->guard_interval) {
        case GUARD_INTERVAL_1_4:
                guard = 4;
                break;
        case GUARD_INTERVAL_1_8: