/*
 * Linux-DVB Driver for DiBcom's DiB7000M and
 *              first generation DiB7000P-demodulator-family.
 *
 * Copyright (C) 2005-7 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mutex.h>

#include <media/dvb_frontend.h>

#include "dib7000m.h"

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

#define dprintk(fmt, arg...) do {                                       \
        if (debug)                                                      \
                printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
                       __func__, ##arg);                                \
} while (0)

struct dib7000m_state {
        struct dvb_frontend demod;
    struct dib7000m_config cfg;

        u8 i2c_addr;
        struct i2c_adapter   *i2c_adap;

        struct dibx000_i2c_master i2c_master;

/* offset is 1 in case of the 7000MC */
        u8 reg_offs;

        u16 wbd_ref;

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

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

        u16 revision;

        u8 agc_state;

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

enum dib7000m_power_mode {
        DIB7000M_POWER_ALL = 0,

        DIB7000M_POWER_NO,
        DIB7000M_POWER_INTERF_ANALOG_AGC,
        DIB7000M_POWER_COR4_DINTLV_ICIRM_EQUAL_CFROD,
        DIB7000M_POWER_COR4_CRY_ESRAM_MOUT_NUD,
        DIB7000M_POWER_INTERFACE_ONLY,
};

static u16 dib7000m_read_word(struct dib7000m_state *state, u16 reg)
{
        u16 ret;

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

        state->i2c_write_buffer[0] = (reg >> 8) | 0x80;
        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\n", reg);

        ret = (state->i2c_read_buffer[0] << 8) | state->i2c_read_buffer[1];
        mutex_unlock(&state->i2c_buffer_lock);

        return ret;
}

static int dib7000m_write_word(struct dib7000m_state *state, u16 reg, u16 val)
{
        int ret;

        if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
                dprintk("could not acquire lock\n");
                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 void dib7000m_write_tab(struct dib7000m_state *state, u16 *buf)
{
        u16 l = 0, r, *n;
        n = buf;
        l = *n++;
        while (l) {
                r = *n++;

                if (state->reg_offs && (r >= 112 && r <= 331)) // compensate for 7000MC
                        r++;

                do {
                        dib7000m_write_word(state, r, *n++);
                        r++;
                } while (--l);
                l = *n++;
        }
}

static int dib7000m_set_output_mode(struct dib7000m_state *state, int mode)
{
        int    ret = 0;
        u16 outreg, fifo_threshold, smo_mode,
                sram = 0x0005; /* by default SRAM output is disabled */

        outreg = 0;
        fifo_threshold = 1792;
        smo_mode = (dib7000m_read_word(state, 294 + state->reg_offs) & 0x0010) | (1 << 1);

        dprintk("setting output mode for demod %p to %d\n", &state->demod, 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 */
                        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;
                default:
                        dprintk("Unhandled output_mode passed to be set for demod %p\n", &state->demod);
                        break;
        }

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

        ret |= dib7000m_write_word(state,  294 + state->reg_offs, smo_mode);
        ret |= dib7000m_write_word(state,  295 + state->reg_offs, fifo_threshold); /* synchronous fread */
        ret |= dib7000m_write_word(state, 1795, outreg);
        ret |= dib7000m_write_word(state, 1805, sram);

        if (state->revision == 0x4003) {
                u16 clk_cfg1 = dib7000m_read_word(state, 909) & 0xfffd;
                if (mode == OUTMODE_DIVERSITY)
                        clk_cfg1 |= (1 << 1); // P_O_CLK_en
                dib7000m_write_word(state, 909, clk_cfg1);
        }
        return ret;
}

static void dib7000m_set_power_mode(struct dib7000m_state *state, enum dib7000m_power_mode mode)
{
        /* by default everything is going to be powered off */
        u16 reg_903 = 0xffff, reg_904 = 0xffff, reg_905 = 0xffff, reg_906  = 0x3fff;
        u8  offset = 0;

        /* now, depending on the requested mode, we power on */
        switch (mode) {
                /* power up everything in the demod */
                case DIB7000M_POWER_ALL:
                        reg_903 = 0x0000; reg_904 = 0x0000; reg_905 = 0x0000; reg_906 = 0x0000;
                        break;

                /* just leave power on the control-interfaces: GPIO and (I2C or SDIO or SRAM) */
                case DIB7000M_POWER_INTERFACE_ONLY: /* TODO power up either SDIO or I2C or SRAM */
                        reg_905 &= ~((1 << 7) | (1 << 6) | (1 << 5) | (1 << 2));
                        break;

                case DIB7000M_POWER_INTERF_ANALOG_AGC:
                        reg_903 &= ~((1 << 15) | (1 << 14) | (1 << 11) | (1 << 10));
                        reg_905 &= ~((1 << 7) | (1 << 6) | (1 << 5) | (1 << 4) | (1 << 2));
                        reg_906 &= ~((1 << 0));
                        break;

                case DIB7000M_POWER_COR4_DINTLV_ICIRM_EQUAL_CFROD:
                        reg_903 = 0x0000; reg_904 = 0x801f; reg_905 = 0x0000; reg_906 = 0x0000;
                        break;

                case DIB7000M_POWER_COR4_CRY_ESRAM_MOUT_NUD:
                        reg_903 = 0x0000; reg_904 = 0x8000; reg_905 = 0x010b; reg_906 = 0x0000;
                        break;
                case DIB7000M_POWER_NO:
                        break;
        }

        /* always power down unused parts */
        if (!state->cfg.mobile_mode)
                reg_904 |= (1 << 7) | (1 << 6) | (1 << 4) | (1 << 2) | (1 << 1);

        /* P_sdio_select_clk = 0 on MC and after*/
        if (state->revision != 0x4000)
                reg_906 <<= 1;

        if (state->revision == 0x4003)
                offset = 1;

        dib7000m_write_word(state, 903 + offset, reg_903);
        dib7000m_write_word(state, 904 + offset, reg_904);
        dib7000m_write_word(state, 905 + offset, reg_905);
        dib7000m_write_word(state, 906 + offset, reg_906);
}

static int dib7000m_set_adc_state(struct dib7000m_state *state, enum dibx000_adc_states no)
{
        int ret = 0;
        u16 reg_913 = dib7000m_read_word(state, 913),
               reg_914 = dib7000m_read_word(state, 914);

        switch (no) {
                case DIBX000_SLOW_ADC_ON:
                        reg_914 |= (1 << 1) | (1 << 0);
                        ret |= dib7000m_write_word(state, 914, reg_914);
                        reg_914 &= ~(1 << 1);
                        break;

                case DIBX000_SLOW_ADC_OFF:
                        reg_914 |=  (1 << 1) | (1 << 0);
                        break;

                case DIBX000_ADC_ON:
                        if (state->revision == 0x4000) { // workaround for PA/MA
                                // power-up ADC
                                dib7000m_write_word(state, 913, 0);
                                dib7000m_write_word(state, 914, reg_914 & 0x3);
                                // power-down bandgag
                                dib7000m_write_word(state, 913, (1 << 15));
                                dib7000m_write_word(state, 914, reg_914 & 0x3);
                        }

                        reg_913 &= 0x0fff;
                        reg_914 &= 0x0003;
                        break;

                case DIBX000_ADC_OFF: // leave the VBG voltage on
                        reg_913 |= (1 << 14) | (1 << 13) | (1 << 12);
                        reg_914 |= (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2);
                        break;

                case DIBX000_VBG_ENABLE:
                        reg_913 &= ~(1 << 15);
                        break;

                case DIBX000_VBG_DISABLE:
                        reg_913 |= (1 << 15);
                        break;

                default:
                        break;
        }

//      dprintk("913: %x, 914: %x\n", reg_913, reg_914);
        ret |= dib7000m_write_word(state, 913, reg_913);
        ret |= dib7000m_write_word(state, 914, reg_914);

        return ret;
}

static int dib7000m_set_bandwidth(struct dib7000m_state *state, u32 bw)
{
        u32 timf;

        if (!bw)
                bw = 8000;

        // store the current bandwidth for later use
        state->current_bandwidth = bw;

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

        timf = timf * (bw / 50) / 160;

        dib7000m_write_word(state, 23, (u16) ((timf >> 16) & 0xffff));
        dib7000m_write_word(state, 24, (u16) ((timf      ) & 0xffff));

        return 0;
}

static int dib7000m_set_diversity_in(struct dvb_frontend *demod, int onoff)
{
        struct dib7000m_state *state = demod->demodulator_priv;

        if (state->div_force_off) {
                dprintk("diversity combination deactivated - forced by COFDM parameters\n");
                onoff = 0;
        }
        state->div_state = (u8)onoff;

        if (onoff) {
                dib7000m_write_word(state, 263 + state->reg_offs, 6);
                dib7000m_write_word(state, 264 + state->reg_offs, 6);
                dib7000m_write_word(state, 266 + state->reg_offs, (state->div_sync_wait << 4) | (1 << 2) | (2 << 0));
        } else {
                dib7000m_write_word(state, 263 + state->reg_offs, 1);
                dib7000m_write_word(state, 264 + state->reg_offs, 0);
                dib7000m_write_word(state, 266 + state->reg_offs, 0);
        }

        return 0;
}

static int dib7000m_sad_calib(struct dib7000m_state *state)
{

/* internal */
//      dib7000m_write_word(state, 928, (3 << 14) | (1 << 12) | (524 << 0)); // sampling clock of the SAD is writting in set_bandwidth
        dib7000m_write_word(state, 929, (0 << 1) | (0 << 0));
        dib7000m_write_word(state, 930, 776); // 0.625*3.3 / 4096

        /* do the calibration */
        dib7000m_write_word(state, 929, (1 << 0));
        dib7000m_write_word(state, 929, (0 << 0));

        msleep(1);

        return 0;
}

static void dib7000m_reset_pll_common(struct dib7000m_state *state, const struct dibx000_bandwidth_config *bw)
{
        dib7000m_write_word(state, 18, (u16) (((bw->internal*1000) >> 16) & 0xffff));
        dib7000m_write_word(state, 19, (u16) ( (bw->internal*1000)        & 0xffff));
        dib7000m_write_word(state, 21, (u16) ( (bw->ifreq          >> 16) & 0xffff));
        dib7000m_write_word(state, 22, (u16) (  bw->ifreq                 & 0xffff));

        dib7000m_write_word(state, 928, bw->sad_cfg);
}

static void dib7000m_reset_pll(struct dib7000m_state *state)
{
        const struct dibx000_bandwidth_config *bw = state->cfg.bw;
        u16 reg_907,reg_910;

        /* default */
        reg_907 = (bw->pll_bypass << 15) | (bw->modulo << 7) |
                (bw->ADClkSrc << 6) | (bw->IO_CLK_en_core << 5) | (bw->bypclk_div << 2) |
                (bw->enable_refdiv << 1) | (0 << 0);
        reg_910 = (((bw->pll_ratio >> 6) & 0x3) << 3) | (bw->pll_range << 1) | bw->pll_reset;

        // for this oscillator frequency should be 30 MHz for the Master (default values in the board_parameters give that value)
        // this is only working only for 30 MHz crystals
        if (!state->cfg.quartz_direct) {
                reg_910 |= (1 << 5);  // forcing the predivider to 1

                // if the previous front-end is baseband, its output frequency is 15 MHz (prev freq divided by 2)
                if(state->cfg.input_clk_is_div_2)
                        reg_907 |= (16 << 9);
                else // otherwise the previous front-end puts out its input (default 30MHz) - no extra division necessary
                        reg_907 |= (8 << 9);
        } else {
                reg_907 |= (bw->pll_ratio & 0x3f) << 9;
                reg_910 |= (bw->pll_prediv << 5);
        }

        dib7000m_write_word(state, 910, reg_910); // pll cfg
        dib7000m_write_word(state, 907, reg_907); // clk cfg0
        dib7000m_write_word(state, 908, 0x0006);  // clk_cfg1

        dib7000m_reset_pll_common(state, bw);
}

static void dib7000mc_reset_pll(struct dib7000m_state *state)
{
        const struct dibx000_bandwidth_config *bw = state->cfg.bw;
        u16 clk_cfg1;

        // clk_cfg0
        dib7000m_write_word(state, 907, (bw->pll_prediv << 8) | (bw->pll_ratio << 0));

        // clk_cfg1
        //dib7000m_write_word(state, 908, (1 << 14) | (3 << 12) |(0 << 11) |
        clk_cfg1 = (0 << 14) | (3 << 12) |(0 << 11) |
                        (bw->IO_CLK_en_core << 10) | (bw->bypclk_div << 5) | (bw->enable_refdiv << 4) |
                        (1 << 3) | (bw->pll_range << 1) | (bw->pll_reset << 0);
        dib7000m_write_word(state, 908, clk_cfg1);
        clk_cfg1 = (clk_cfg1 & 0xfff7) | (bw->pll_bypass << 3);
        dib7000m_write_word(state, 908, clk_cfg1);

        // smpl_cfg
        dib7000m_write_word(state, 910, (1 << 12) | (2 << 10) | (bw->modulo << 8) | (bw->ADClkSrc << 7));

        dib7000m_reset_pll_common(state, bw);
}

static int dib7000m_reset_gpio(struct dib7000m_state *st)
{
        /* reset the GPIOs */
        dib7000m_write_word(st, 773, st->cfg.gpio_dir);
        dib7000m_write_word(st, 774, st->cfg.gpio_val);

        /* TODO 782 is P_gpio_od */

        dib7000m_write_word(st, 775, st->cfg.gpio_pwm_pos);

        dib7000m_write_word(st, 780, st->cfg.pwm_freq_div);
        return 0;
}

static u16 dib7000m_defaults_common[] =

{
        // auto search configuration
        3, 2,
                0x0004,
                0x1000,
                0x0814,

        12, 6,
                0x001b,
                0x7740,
                0x005b,
                0x8d80,
                0x01c9,
                0xc380,
                0x0000,
                0x0080,
                0x0000,
                0x0090,
                0x0001,
                0xd4c0,

        1, 26,
                0x6680, // P_corm_thres Lock algorithms configuration

        1, 170,
                0x0410, // P_palf_alpha_regul, P_palf_filter_freeze, P_palf_filter_on

        8, 173,
                0,
                0,
                0,
                0,
                0,
                0,
                0,
                0,

        1, 182,
                8192, // P_fft_nb_to_cut

        2, 195,
                0x0ccd, // P_pha3_thres
                0,      // P_cti_use_cpe, P_cti_use_prog

        1, 205,
                0x200f, // P_cspu_regul, P_cspu_win_cut

        5, 214,
                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, 226,
                0, // P_2d_byp_ti_num

        1, 255,
                0x800, // P_equal_thres_wgn

        1, 263,
                0x0001,

        1, 281,
                0x0010, // P_fec_*

        1, 294,
                0x0062, // P_smo_mode, P_smo_rs_discard, P_smo_fifo_flush, P_smo_pid_parse, P_smo_error_discard

        0
};

static u16 dib7000m_defaults[] =

{
        /* set ADC level to -16 */
        11, 76,
                (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,

        // Tuner IO bank: max drive (14mA)
        1, 912,
                0x2c8a,

        1, 1817,
                1,

        0,
};

static int dib7000m_demod_reset(struct dib7000m_state *state)
{
        dib7000m_set_power_mode(state, DIB7000M_POWER_ALL);

        /* always leave the VBG voltage on - it consumes almost nothing but takes a long time to start */
        dib7000m_set_adc_state(state, DIBX000_VBG_ENABLE);

        /* restart all parts */
        dib7000m_write_word(state,  898, 0xffff);
        dib7000m_write_word(state,  899, 0xffff);
        dib7000m_write_word(state,  900, 0xff0f);
        dib7000m_write_word(state,  901, 0xfffc);

        dib7000m_write_word(state,  898, 0);
        dib7000m_write_word(state,  899, 0);
        dib7000m_write_word(state,  900, 0);
        dib7000m_write_word(state,  901, 0);

        if (state->revision == 0x4000)
                dib7000m_reset_pll(state);
        else
                dib7000mc_reset_pll(state);

        if (dib7000m_reset_gpio(state) != 0)
                dprintk("GPIO reset was not successful.\n");

        if (dib7000m_set_output_mode(state, OUTMODE_HIGH_Z) != 0)
                dprintk("OUTPUT_MODE could not be reset.\n");

        /* unforce divstr regardless whether i2c enumeration was done or not */
        dib7000m_write_word(state, 1794, dib7000m_read_word(state, 1794) & ~(1 << 1) );

        dib7000m_set_bandwidth(state, 8000);

        dib7000m_set_adc_state(state, DIBX000_SLOW_ADC_ON);
        dib7000m_sad_calib(state);
        dib7000m_set_adc_state(state, DIBX000_SLOW_ADC_OFF);

        if (state->cfg.dvbt_mode)
                dib7000m_write_word(state, 1796, 0x0); // select DVB-T output

        if (state->cfg.mobile_mode)
                dib7000m_write_word(state, 261 + state->reg_offs, 2);
        else
                dib7000m_write_word(state, 224 + state->reg_offs, 1);

        // P_iqc_alpha_pha, P_iqc_alpha_amp, P_iqc_dcc_alpha, ...
        if(state->cfg.tuner_is_baseband)
                dib7000m_write_word(state, 36, 0x0755);
        else
                dib7000m_write_word(state, 36, 0x1f55);

        // P_divclksel=3 P_divbitsel=1
        if (state->revision == 0x4000)
                dib7000m_write_word(state, 909, (3 << 10) | (1 << 6));
        else
                dib7000m_write_word(state, 909, (3 << 4) | 1);

        dib7000m_write_tab(state, dib7000m_defaults_common);
        dib7000m_write_tab(state, dib7000m_defaults);

        dib7000m_set_power_mode(state, DIB7000M_POWER_INTERFACE_ONLY);

        state->internal_clk = state->cfg.bw->internal;

        return 0;
}

static void dib7000m_restart_agc(struct dib7000m_state *state)
{
        // P_restart_iqc & P_restart_agc
        dib7000m_write_word(state, 898, 0x0c00);
        dib7000m_write_word(state, 898, 0x0000);
}

static int dib7000m_agc_soft_split(struct dib7000m_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 = dib7000m_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\n", split_offset);

        // P_agc_force_split and P_agc_split_offset
        return dib7000m_write_word(state, 103, (dib7000m_read_word(state, 103) & 0xff00) | split_offset);
}

static int dib7000m_update_lna(struct dib7000m_state *state)
{
        u16 dyn_gain;

        if (state->cfg.update_lna) {
                // read dyn_gain here (because it is demod-dependent and not fe)
                dyn_gain = dib7000m_read_word(state, 390);

                if (state->cfg.update_lna(&state->demod,dyn_gain)) { // LNA has changed
                        dib7000m_restart_agc(state);
                        return 1;
                }
        }
        return 0;
}

static int dib7000m_set_agc_config(struct dib7000m_state *state, u8 band)
{
        struct dibx000_agc_config *agc = NULL;
        int i;
        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\n", band);
                return -EINVAL;
        }

        state->current_agc = agc;

        /* AGC */
        dib7000m_write_word(state, 72 ,  agc->setup);
        dib7000m_write_word(state, 73 ,  agc->inv_gain);
        dib7000m_write_word(state, 74 ,  agc->time_stabiliz);
        dib7000m_write_word(state, 97 , (agc->alpha_level << 12) | agc->thlock);

        // Demod AGC loop configuration
        dib7000m_write_word(state, 98, (agc->alpha_mant << 5) | agc->alpha_exp);
        dib7000m_write_word(state, 99, (agc->beta_mant  << 6) | agc->beta_exp);

        dprintk("WBD: ref: %d, sel: %d, active: %d, alpha: %d\n",
                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)
                dib7000m_write_word(state, 102, state->wbd_ref);
        else // use default
                dib7000m_write_word(state, 102, agc->wbd_ref);

        dib7000m_write_word(state, 103, (agc->wbd_alpha << 9) | (agc->perform_agc_softsplit << 8) );
        dib7000m_write_word(state, 104,  agc->agc1_max);
        dib7000m_write_word(state, 105,  agc->agc1_min);
        dib7000m_write_word(state, 106,  agc->agc2_max);
        dib7000m_write_word(state, 107,  agc->agc2_min);
        dib7000m_write_word(state, 108, (agc->agc1_pt1 << 8) | agc->agc1_pt2 );
        dib7000m_write_word(state, 109, (agc->agc1_slope1 << 8) | agc->agc1_slope2);
        dib7000m_write_word(state, 110, (agc->agc2_pt1 << 8) | agc->agc2_pt2);
        dib7000m_write_word(state, 111, (agc->agc2_slope1 << 8) | agc->agc2_slope2);

        if (state->revision > 0x4000) { // settings for the MC
                dib7000m_write_word(state, 71,   agc->agc1_pt3);
//              dprintk("929: %x %d %d\n",
//                      (dib7000m_read_word(state, 929) & 0xffe3) | (agc->wbd_inv << 4) | (agc->wbd_sel << 2), agc->wbd_inv, agc->wbd_sel);
                dib7000m_write_word(state, 929, (dib7000m_read_word(state, 929) & 0xffe3) | (agc->wbd_inv << 4) | (agc->wbd_sel << 2));
        } else {
                // wrong default values
                u16 b[9] = { 676, 696, 717, 737, 758, 778, 799, 819, 840 };
                for (i = 0; i < 9; i++)
                        dib7000m_write_word(state, 88 + i, b[i]);
        }
        return 0;
}

static void dib7000m_update_timf(struct dib7000m_state *state)
{
        u32 timf = (dib7000m_read_word(state, 436) << 16) | dib7000m_read_word(state, 437);
        state->timf = timf * 160 / (state->current_bandwidth / 50);
        dib7000m_write_word(state, 23, (u16) (timf >> 16));
        dib7000m_write_word(state, 24, (u16) (timf & 0xffff));
        dprintk("updated timf_frequency: %d (default: %d)\n", state->timf, state->timf_default);
}

static int dib7000m_agc_startup(struct dvb_frontend *demod)
{
        struct dtv_frontend_properties *ch = &demod->dtv_property_cache;
        struct dib7000m_state *state = demod->demodulator_priv;
        u16 cfg_72 = dib7000m_read_word(state, 72);
        int ret = -1;
        u8 *agc_state = &state->agc_state;
        u8 agc_split;

        switch (state->agc_state) {
                case 0:
                        // set power-up level: interf+analog+AGC
                        dib7000m_set_power_mode(state, DIB7000M_POWER_INTERF_ANALOG_AGC);
                        dib7000m_set_adc_state(state, DIBX000_ADC_ON);

                        if (dib7000m_set_agc_config(state, BAND_OF_FREQUENCY(ch->frequency/1000)) != 0)
                                return -1;

                        ret = 7; /* ADC power up */
                        (*agc_state)++;
                        break;

                case 1:
                        /* AGC initialization */
                        if (state->cfg.agc_control)
                                state->cfg.agc_control(&state->demod, 1);

                        dib7000m_write_word(state, 75, 32768);
                        if (!state->current_agc->perform_agc_softsplit) {
                                /* we are using the wbd - so slow AGC startup */
                                dib7000m_write_word(state, 103, 1 << 8); /* force 0 split on WBD and restart AGC */
                                (*agc_state)++;
                                ret = 5;
                        } else {
                                /* default AGC startup */
                                (*agc_state) = 4;
                                /* wait AGC rough lock time */
                                ret = 7;
                        }

                        dib7000m_restart_agc(state);
                        break;

                case 2: /* fast split search path after 5sec */
                        dib7000m_write_word(state,  72, cfg_72 | (1 << 4)); /* freeze AGC loop */
                        dib7000m_write_word(state, 103, 2 << 9);            /* fast split search 0.25kHz */
                        (*agc_state)++;
                        ret = 14;
                        break;

        case 3: /* split search ended */
                        agc_split = (u8)dib7000m_read_word(state, 392); /* store the split value for the next time */
                        dib7000m_write_word(state, 75, dib7000m_read_word(state, 390)); /* set AGC gain start value */

                        dib7000m_write_word(state, 72,  cfg_72 & ~(1 << 4));   /* std AGC loop */
                        dib7000m_write_word(state, 103, (state->current_agc->wbd_alpha << 9) | agc_split); /* standard split search */

                        dib7000m_restart_agc(state);

                        dprintk("SPLIT %p: %hd\n", demod, agc_split);

                        (*agc_state)++;
                        ret = 5;
                        break;

                case 4: /* LNA startup */
                        /* wait AGC accurate lock time */
                        ret = 7;

                        if (dib7000m_update_lna(state))
                                // wait only AGC rough lock time
                                ret = 5;
                        else
                                (*agc_state)++;
                        break;

                case 5:
                        dib7000m_agc_soft_split(state);

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

                        (*agc_state)++;
                        break;

                default:
                        break;
        }
        return ret;
}

static void dib7000m_set_channel(struct dib7000m_state *state, struct dtv_frontend_properties *ch,
                                 u8 seq)
{
        u16 value, est[4];

        dib7000m_set_bandwidth(state, BANDWIDTH_TO_KHZ(ch->bandwidth_hz));

        /* nfft, guard, qam, alpha */
        value = 0;
        switch (ch->transmission_mode) {
                case TRANSMISSION_MODE_2K: value |= (0 << 7); break;
                case TRANSMISSION_MODE_4K: value |= (2 << 7); break;
                default:
                case TRANSMISSION_MODE_8K: value |= (1 << 7); break;
        }
        switch (ch->guard_interval) {
                case GUARD_INTERVAL_1_32: value |= (0 << 5); break;
                case GUARD_INTERVAL_1_16: value |= (1 << 5); break;
                case GUARD_INTERVAL_1_4:  value |= (3 << 5); break;
                default:
                case GUARD_INTERVAL_1_8:  value |= (2 << 5); break;
        }
        switch (ch->modulation) {
                case QPSK:  value |= (0 << 3); break;
                case QAM_16: value |= (1 << 3); break;
                default:
                case QAM_64: value |= (2 << 3); break;
        }
        switch (HIERARCHY_1) {
                case HIERARCHY_2: value |= 2; break;
                case HIERARCHY_4: value |= 4; break;
                default:
                case HIERARCHY_1: value |= 1; break;
        }
        dib7000m_write_word(state, 0, value);
        dib7000m_write_word(state, 5, (seq << 4));

        /* P_dintl_native, P_dintlv_inv, P_hrch, P_code_rate, P_select_hp */
        value = 0;
        if (1 != 0)
                value |= (1 << 6);
        if (ch->hierarchy == 1)
                value |= (1 << 4);
        if (1 == 1)
                value |= 1;
        switch ((ch->hierarchy == 0 || 1 == 1) ? ch->code_rate_HP : ch->code_rate_LP) {
                case FEC_2_3: value |= (2 << 1); break;
                case FEC_3_4: value |= (3 << 1); break;
                case FEC_5_6: value |= (5 << 1); break;
                case FEC_7_8: value |= (7 << 1); break;
                default:
                case FEC_1_2: value |= (1 << 1); break;
        }
        dib7000m_write_word(state, 267 + state->reg_offs, value);

        /* offset loop parameters */

        /* P_timf_alpha = 6, P_corm_alpha=6, P_corm_thres=0x80 */
        dib7000m_write_word(state, 26, (6 << 12) | (6 << 8) | 0x80);

        /* P_ctrl_inh_cor=0, P_ctrl_alpha_cor=4, P_ctrl_inh_isi=1, P_ctrl_alpha_isi=3, P_ctrl_inh_cor4=1, P_ctrl_alpha_cor4=3 */
        dib7000m_write_word(state, 29, (0 << 14) | (4 << 10) | (1 << 9) | (3 << 5) | (1 << 4) | (0x3));

        /* P_ctrl_freeze_pha_shift=0, P_ctrl_pha_off_max=3 */
        dib7000m_write_word(state, 32, (0 << 4) | 0x3);

        /* P_ctrl_sfreq_inh=0, P_ctrl_sfreq_step=5 */
        dib7000m_write_word(state, 33, (0 << 4) | 0x5);

        /* P_dvsy_sync_wait */
        switch (ch->transmission_mode) {
                case TRANSMISSION_MODE_8K: value = 256; break;
                case TRANSMISSION_MODE_4K: value = 128; break;
                case TRANSMISSION_MODE_2K:
                default: value = 64; break;
        }
        switch (ch->guard_interval) {
                case GUARD_INTERVAL_1_16: value *= 2; break;
                case GUARD_INTERVAL_1_8:  value *= 4; break;
                case GUARD_INTERVAL_1_4:  value *= 8; break;
                default:
                case GUARD_INTERVAL_1_32: value *= 1; break;
        }
        state->div_sync_wait = (value * 3) / 2 + 32; // add 50% SFN margin + compensate for one DVSY-fifo TODO

        /* deactive the possibility of diversity reception if extended interleave - not for 7000MC */
        /* P_dvsy_sync_mode = 0, P_dvsy_sync_enable=1, P_dvcb_comb_mode=2 */
        if (1 == 1 || state->revision > 0x4000)
                state->div_force_off = 0;
        else
                state->div_force_off = 1;
        dib7000m_set_diversity_in(&state->demod, state->div_state);

        /* channel estimation fine configuration */
        switch (ch->modulation) {
                case QAM_64:
                        est[0] = 0x0148;       /* P_adp_regul_cnt 0.04 */
                        est[1] = 0xfff0;       /* P_adp_noise_cnt -0.002 */
                        est[2] = 0x00a4;       /* P_adp_regul_ext 0.02 */
                        est[3] = 0xfff8;       /* P_adp_noise_ext -0.001 */
                        break;
                case QAM_16:
                        est[0] = 0x023d;       /* P_adp_regul_cnt 0.07 */
                        est[1] = 0xffdf;       /* P_adp_noise_cnt -0.004 */
                        est[2] = 0x00a4;       /* P_adp_regul_ext 0.02 */
                        est[3] = 0xfff0;       /* P_adp_noise_ext -0.002 */
                        break;
                default:
                        est[0] = 0x099a;       /* P_adp_regul_cnt 0.3 */
                        est[1] = 0xffae;       /* P_adp_noise_cnt -0.01 */
                        est[2] = 0x0333;       /* P_adp_regul_ext 0.1 */
                        est[3] = 0xfff8;       /* P_adp_noise_ext -0.002 */
                        break;
        }
        for (value = 0; value < 4; value++)
                dib7000m_write_word(state, 214 + value + state->reg_offs, est[value]);

        // set power-up level: autosearch
        dib7000m_set_power_mode(state, DIB7000M_POWER_COR4_DINTLV_ICIRM_EQUAL_CFROD);
}

static int dib7000m_autosearch_start(struct dvb_frontend *demod)
{
        struct dtv_frontend_properties *ch = &demod->dtv_property_cache;
        struct dib7000m_state *state = demod->demodulator_priv;
        struct dtv_frontend_properties schan;
        int ret = 0;
        u32 value, factor;

        schan = *ch;

        schan.modulation = QAM_64;
        schan.guard_interval        = GUARD_INTERVAL_1_32;
        schan.transmission_mode         = TRANSMISSION_MODE_8K;
        schan.code_rate_HP = FEC_2_3;
        schan.code_rate_LP = FEC_3_4;
        schan.hierarchy    = 0;

        dib7000m_set_channel(state, &schan, 7);

        factor = BANDWIDTH_TO_KHZ(schan.bandwidth_hz);
        if (factor >= 5000)
                factor = 1;
        else
                factor = 6;

        // always use the setting for 8MHz here lock_time for 7,6 MHz are longer
        value = 30 * state->internal_clk * factor;
        ret |= dib7000m_write_word(state, 6,  (u16) ((value >> 16) & 0xffff)); // lock0 wait time
        ret |= dib7000m_write_word(state, 7,  (u16)  (value        & 0xffff)); // lock0 wait time
        value = 100 * state->internal_clk * factor;
        ret |= dib7000m_write_word(state, 8,  (u16) ((value >> 16) & 0xffff)); // lock1 wait time
        ret |= dib7000m_write_word(state, 9,  (u16)  (value        & 0xffff)); // lock1 wait time
        value = 500 * state->internal_clk * factor;
        ret |= dib7000m_write_word(state, 10, (u16) ((value >> 16) & 0xffff)); // lock2 wait time

        ret |= dib7000m_write_word(state, 11, (u16)  (value        & 0xffff)); // lock2 wait time

        // start search
        value = dib7000m_read_word(state, 0);
        ret |= dib7000m_write_word(state, 0, (u16) (value | (1 << 9)));

        /* clear n_irq_pending */
        if (state->revision == 0x4000)
                dib7000m_write_word(state, 1793, 0);
        else
                dib7000m_read_word(state, 537);

        ret |= dib7000m_write_word(state, 0, (u16) value);

        return ret;
}

static int dib7000m_autosearch_irq(struct dib7000m_state *state, u16 reg)
{
        u16 irq_pending = dib7000m_read_word(state, reg);

        if (irq_pending & 0x1) { // failed
                dprintk("autosearch failed\n");
                return 1;
        }

        if (irq_pending & 0x2) { // succeeded
                dprintk("autosearch succeeded\n");
                return 2;
        }
        return 0; // still pending
}

static int dib7000m_autosearch_is_irq(struct dvb_frontend *demod)
{
        struct dib7000m_state *state = demod->demodulator_priv;
        if (state->revision == 0x4000)
                return dib7000m_autosearch_irq(state, 1793);
        else
                return dib7000m_autosearch_irq(state, 537);
}

static int dib7000m_tune(struct dvb_frontend *demod)
{
        struct dtv_frontend_properties *ch = &demod->dtv_property_cache;
        struct dib7000m_state *state = demod->demodulator_priv;
        int ret = 0;
        u16 value;

        // we are already tuned - just resuming from suspend
        dib7000m_set_channel(state, ch, 0);

        // restart demod
        ret |= dib7000m_write_word(state, 898, 0x4000);
        ret |= dib7000m_write_word(state, 898, 0x0000);
        msleep(45);

        dib7000m_set_power_mode(state, DIB7000M_POWER_COR4_CRY_ESRAM_MOUT_NUD);
        /* P_ctrl_inh_cor=0, P_ctrl_alpha_cor=4, P_ctrl_inh_isi=0, P_ctrl_alpha_isi=3, P_ctrl_inh_cor4=1, P_ctrl_alpha_cor4=3 */
        ret |= dib7000m_write_word(state, 29, (0 << 14) | (4 << 10) | (0 << 9) | (3 << 5) | (1 << 4) | (0x3));

        // never achieved a lock before - wait for timfreq to update
        if (state->timf == 0)
                msleep(200);

        //dump_reg(state);
        /* P_timf_alpha, P_corm_alpha=6, P_corm_thres=0x80 */
        value = (6 << 8) | 0x80;
        switch (ch->transmission_mode) {
                case TRANSMISSION_MODE_2K: value |= (7 << 12); break;
                case TRANSMISSION_MODE_4K: value |= (8 << 12); break;
                default:
                case TRANSMISSION_MODE_8K: value |= (9 << 12); break;
        }
        ret |= dib7000m_write_word(state, 26, value);

        /* P_ctrl_freeze_pha_shift=0, P_ctrl_pha_off_max */
        value = (0 << 4);
        switch (ch->transmission_mode) {
                case TRANSMISSION_MODE_2K: value |= 0x6; break;
                case TRANSMISSION_MODE_4K: value |= 0x7; break;
                default:
                case TRANSMISSION_MODE_8K: value |= 0x8; break;
        }
        ret |= dib7000m_write_word(state, 32, value);

        /* P_ctrl_sfreq_inh=0, P_ctrl_sfreq_step */
        value = (0 << 4);
        switch (ch->transmission_mode) {
                case TRANSMISSION_MODE_2K: value |= 0x6; break;
                case TRANSMISSION_MODE_4K: value |= 0x7; break;
                default:
                case TRANSMISSION_MODE_8K: value |= 0x8; break;
        }
        ret |= dib7000m_write_word(state, 33,  value);

        // we achieved a lock - it's time to update the timf freq
        if ((dib7000m_read_word(state, 535) >> 6)  & 0x1)
                dib7000m_update_timf(state);

        dib7000m_set_bandwidth(state, BANDWIDTH_TO_KHZ(ch->bandwidth_hz));
        return ret;
}

static int dib7000m_wakeup(struct dvb_frontend *demod)
{
        struct dib7000m_state *state = demod->demodulator_priv;

        dib7000m_set_power_mode(state, DIB7000M_POWER_ALL);

        if (dib7000m_set_adc_state(state, DIBX000_SLOW_ADC_ON) != 0)
                dprintk("could not start Slow ADC\n");

        return 0;
}

static int dib7000m_sleep(struct dvb_frontend *demod)
{
        struct dib7000m_state *st = demod->demodulator_priv;
        dib7000m_set_output_mode(st, OUTMODE_HIGH_Z);
        dib7000m_set_power_mode(st, DIB7000M_POWER_INTERFACE_ONLY);
        return dib7000m_set_adc_state(st, DIBX000_SLOW_ADC_OFF) |
                dib7000m_set_adc_state(st, DIBX000_ADC_OFF);
}

static int dib7000m_identify(struct dib7000m_state *state)
{
        u16 value;

        if ((value = dib7000m_read_word(state, 896)) != 0x01b3) {
                dprintk("wrong Vendor ID (0x%x)\n", value);
                return -EREMOTEIO;
        }

        state->revision = dib7000m_read_word(state, 897);
        if (state->revision != 0x4000 &&
                state->revision != 0x4001 &&
                state->revision != 0x4002 &&
                state->revision != 0x4003) {
                dprintk("wrong Device ID (0x%x)\n", value);
                return -EREMOTEIO;
        }

        /* protect this driver to be used with 7000PC */
        if (state->revision == 0x4000 && dib7000m_read_word(state, 769) == 0x4000) {
                dprintk("this driver does not work with DiB7000PC\n");
                return -EREMOTEIO;
        }

        switch (state->revision) {
        case 0x4000: dprintk("found DiB7000MA/PA/MB/PB\n"); break;
        case 0x4001: state->reg_offs = 1; dprintk("found DiB7000HC\n"); break;
        case 0x4002: state->reg_offs = 1; dprintk("found DiB7000MC\n"); break;
        case 0x4003: state->reg_offs = 1; dprintk("found DiB9000\n"); break;
        }

        return 0;
}


static int dib7000m_get_frontend(struct dvb_frontend* fe,
                                 struct dtv_frontend_properties *fep)
{
        struct dib7000m_state *state = fe->demodulator_priv;
        u16 tps = dib7000m_read_word(state,480);

        fep->inversion = INVERSION_AUTO;

        fep->bandwidth_hz = BANDWIDTH_TO_HZ(state->current_bandwidth);

        switch ((tps >> 8) & 0x3) {
                case 0: fep->transmission_mode = TRANSMISSION_MODE_2K; break;
                case 1: fep->transmission_mode = TRANSMISSION_MODE_8K; break;
                /* case 2: fep->transmission_mode = TRANSMISSION_MODE_4K; break; */
        }

        switch (tps & 0x3) {
                case 0: fep->guard_interval = GUARD_INTERVAL_1_32; break;
                case 1: fep->guard_interval = GUARD_INTERVAL_1_16; break;
                case 2: fep->guard_interval = GUARD_INTERVAL_1_8; break;
                case 3: fep->guard_interval = GUARD_INTERVAL_1_4; break;
        }

        switch ((tps >> 14) & 0x3) {
                case 0: fep->modulation = QPSK; break;
                case 1: fep->modulation = QAM_16; break;
                case 2:
                default: fep->modulation = QAM_64; break;
        }

        /* as long as the frontend_param structure is fixed for hierarchical transmission I refuse to use it */
        /* (tps >> 13) & 0x1 == hrch is used, (tps >> 10) & 0x7 == alpha */

        fep->hierarchy = HIERARCHY_NONE;
        switch ((tps >> 5) & 0x7) {
                case 1: fep->code_rate_HP = FEC_1_2; break;
                case 2: fep->code_rate_HP = FEC_2_3; break;
                case 3: fep->code_rate_HP = FEC_3_4; break;
                case 5: fep->code_rate_HP = FEC_5_6; break;
                case 7:
                default: fep->code_rate_HP = FEC_7_8; break;

        }

        switch ((tps >> 2) & 0x7) {
                case 1: fep->code_rate_LP = FEC_1_2; break;
                case 2: fep->code_rate_LP = FEC_2_3; break;
                case 3: fep->code_rate_LP = FEC_3_4; break;
                case 5: fep->code_rate_LP = FEC_5_6; break;
                case 7:
                default: fep->code_rate_LP = FEC_7_8; break;
        }

        /* native interleaver: (dib7000m_read_word(state, 481) >>  5) & 0x1 */

        return 0;
}

static int dib7000m_set_frontend(struct dvb_frontend *fe)
{
        struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
        struct dib7000m_state *state = fe->demodulator_priv;
        int time, ret;

        dib7000m_set_output_mode(state, OUTMODE_HIGH_Z);

        dib7000m_set_bandwidth(state, BANDWIDTH_TO_KHZ(fep->bandwidth_hz));

        if (fe->ops.tuner_ops.set_params)
                fe->ops.tuner_ops.set_params(fe);

        /* start up the AGC */
        state->agc_state = 0;
        do {
                time = dib7000m_agc_startup(fe);
                if (time != -1)
                        msleep(time);
        } while (time != -1);

        if (fep->transmission_mode == TRANSMISSION_MODE_AUTO ||
                fep->guard_interval    == GUARD_INTERVAL_AUTO ||
                fep->modulation        == QAM_AUTO ||
                fep->code_rate_HP      == FEC_AUTO) {
                int i = 800, found;

                dib7000m_autosearch_start(fe);
                do {
                        msleep(1);
                        found = dib7000m_autosearch_is_irq(fe);
                } while (found == 0 && i--);

                dprintk("autosearch returns: %d\n", found);
                if (found == 0 || found == 1)
                        return 0; // no channel found

                dib7000m_get_frontend(fe, fep);
        }

        ret = dib7000m_tune(fe);

        /* make this a config parameter */
        dib7000m_set_output_mode(state, OUTMODE_MPEG2_FIFO);
        return ret;
}

static int dib7000m_read_status(struct dvb_frontend *fe, enum fe_status *stat)
{
        struct dib7000m_state *state = fe->demodulator_priv;
        u16 lock = dib7000m_read_word(state, 535);

        *stat = 0;

        if (lock & 0x8000)
                *stat |= FE_HAS_SIGNAL;
        if (lock & 0x3000)
                *stat |= FE_HAS_CARRIER;
        if (lock & 0x0100)
                *stat |= FE_HAS_VITERBI;
        if (lock & 0x0010)
                *stat |= FE_HAS_SYNC;
        if (lock & 0x0008)
                *stat |= FE_HAS_LOCK;

        return 0;
}

static int dib7000m_read_ber(struct dvb_frontend *fe, u32 *ber)
{
        struct dib7000m_state *state = fe->demodulator_priv;
        *ber = (dib7000m_read_word(state, 526) << 16) | dib7000m_read_word(state, 527);
        return 0;
}

static int dib7000m_read_unc_blocks(struct dvb_frontend *fe, u32 *unc)
{
        struct dib7000m_state *state = fe->demodulator_priv;
        *unc = dib7000m_read_word(state, 534);
        return 0;
}

static int dib7000m_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
        struct dib7000m_state *state = fe->demodulator_priv;
        u16 val = dib7000m_read_word(state, 390);
        *strength = 65535 - val;
        return 0;
}

static int dib7000m_read_snr(struct dvb_frontend* fe, u16 *snr)
{
        *snr = 0x0000;
        return 0;
}

static int dib7000m_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
{
        tune->min_delay_ms = 1000;
        return 0;
}

static void dib7000m_release(struct dvb_frontend *demod)
{
        struct dib7000m_state *st = demod->demodulator_priv;
        dibx000_exit_i2c_master(&st->i2c_master);
        kfree(st);
}

struct i2c_adapter * dib7000m_get_i2c_master(struct dvb_frontend *demod, enum dibx000_i2c_interface intf, int gating)
{
        struct dib7000m_state *st = demod->demodulator_priv;
        return dibx000_get_i2c_adapter(&st->i2c_master, intf, gating);
}
EXPORT_SYMBOL(dib7000m_get_i2c_master);

int dib7000m_pid_filter_ctrl(struct dvb_frontend *fe, u8 onoff)
{
        struct dib7000m_state *state = fe->demodulator_priv;
        u16 val = dib7000m_read_word(state, 294 + state->reg_offs) & 0xffef;
        val |= (onoff & 0x1) << 4;
        dprintk("PID filter enabled %d\n", onoff);
        return dib7000m_write_word(state, 294 + state->reg_offs, val);
}
EXPORT_SYMBOL(dib7000m_pid_filter_ctrl);

int dib7000m_pid_filter(struct dvb_frontend *fe, u8 id, u16 pid, u8 onoff)
{
        struct dib7000m_state *state = fe->demodulator_priv;
        dprintk("PID filter: index %x, PID %d, OnOff %d\n", id, pid, onoff);
        return dib7000m_write_word(state, 300 + state->reg_offs + id,
                        onoff ? (1 << 13) | pid : 0);
}
EXPORT_SYMBOL(dib7000m_pid_filter);

#if 0
/* used with some prototype boards */
int dib7000m_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods,
                u8 default_addr, struct dib7000m_config cfg[])
{
        struct dib7000m_state st = { .i2c_adap = i2c };
        int k = 0;
        u8 new_addr = 0;

        for (k = no_of_demods-1; k >= 0; k--) {
                st.cfg = cfg[k];

                /* designated i2c address */
                new_addr          = (0x40 + k) << 1;
                st.i2c_addr = new_addr;
                if (dib7000m_identify(&st) != 0) {
                        st.i2c_addr = default_addr;
                        if (dib7000m_identify(&st) != 0) {
                                dprintk("DiB7000M #%d: not identified\n", k);
                                return -EIO;
                        }
                }

                /* start diversity to pull_down div_str - just for i2c-enumeration */
                dib7000m_set_output_mode(&st, OUTMODE_DIVERSITY);

                dib7000m_write_word(&st, 1796, 0x0); // select DVB-T output

                /* set new i2c address and force divstart */
                dib7000m_write_word(&st, 1794, (new_addr << 2) | 0x2);

                dprintk("IC %d initialized (to i2c_address 0x%x)\n", k, new_addr);
        }

        for (k = 0; k < no_of_demods; k++) {
                st.cfg = cfg[k];
                st.i2c_addr = (0x40 + k) << 1;

                // unforce divstr
                dib7000m_write_word(&st,1794, st.i2c_addr << 2);

                /* deactivate div - it was just for i2c-enumeration */
                dib7000m_set_output_mode(&st, OUTMODE_HIGH_Z);
        }

        return 0;
}
EXPORT_SYMBOL(dib7000m_i2c_enumeration);
#endif

static const struct dvb_frontend_ops dib7000m_ops;
struct dvb_frontend * dib7000m_attach(struct i2c_adapter *i2c_adap, u8 i2c_addr, struct dib7000m_config *cfg)
{
        struct dvb_frontend *demod;
        struct dib7000m_state *st;
        st = kzalloc(sizeof(struct dib7000m_state), GFP_KERNEL);
        if (st == NULL)
                return NULL;

        memcpy(&st->cfg, cfg, sizeof(struct dib7000m_config));
        st->i2c_adap = i2c_adap;
        st->i2c_addr = i2c_addr;

        demod                   = &st->demod;
        demod->demodulator_priv = st;
        memcpy(&st->demod.ops, &dib7000m_ops, sizeof(struct dvb_frontend_ops));
        mutex_init(&st->i2c_buffer_lock);

        st->timf_default = cfg->bw->timf;

        if (dib7000m_identify(st) != 0)
                goto error;

        if (st->revision == 0x4000)
                dibx000_init_i2c_master(&st->i2c_master, DIB7000, st->i2c_adap, st->i2c_addr);
        else
                dibx000_init_i2c_master(&st->i2c_master, DIB7000MC, st->i2c_adap, st->i2c_addr);

        dib7000m_demod_reset(st);

        return demod;

error:
        kfree(st);
        return NULL;
}
EXPORT_SYMBOL(dib7000m_attach);

static const struct dvb_frontend_ops dib7000m_ops = {
        .delsys = { SYS_DVBT },
        .info = {
                .name = "DiBcom 7000MA/MB/PA/PB/MC",
                .frequency_min_hz      =  44250 * kHz,
                .frequency_max_hz      = 867250 * kHz,
                .frequency_stepsize_hz = 62500,
                .caps = FE_CAN_INVERSION_AUTO |
                        FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
                        FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
                        FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
                        FE_CAN_TRANSMISSION_MODE_AUTO |
                        FE_CAN_GUARD_INTERVAL_AUTO |
                        FE_CAN_RECOVER |
                        FE_CAN_HIERARCHY_AUTO,
        },

        .release              = dib7000m_release,

        .init                 = dib7000m_wakeup,
        .sleep                = dib7000m_sleep,

        .set_frontend         = dib7000m_set_frontend,
        .get_tune_settings    = dib7000m_fe_get_tune_settings,
        .get_frontend         = dib7000m_get_frontend,

        .read_status          = dib7000m_read_status,
        .read_ber             = dib7000m_read_ber,
        .read_signal_strength = dib7000m_read_signal_strength,
        .read_snr             = dib7000m_read_snr,
        .read_ucblocks        = dib7000m_read_unc_blocks,
};

MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@posteo.de>");
MODULE_DESCRIPTION("Driver for the DiBcom 7000MA/MB/PA/PB/MC COFDM demodulator");
MODULE_LICENSE("GPL");