// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for the ST STV0910 DVB-S/S2 demodulator.
 *
 * Copyright (C) 2014-2015 Ralph Metzler <rjkm@metzlerbros.de>
 *                         Marcus Metzler <mocm@metzlerbros.de>
 *                         developed for Digital Devices GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 only, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <asm/div64.h>

#include <media/dvb_frontend.h>
#include "stv0910.h"
#include "stv0910_regs.h"

#define EXT_CLOCK    30000000
#define TUNING_DELAY 200
#define BER_SRC_S    0x20
#define BER_SRC_S2   0x20

static LIST_HEAD(stvlist);

enum receive_mode { RCVMODE_NONE, RCVMODE_DVBS, RCVMODE_DVBS2, RCVMODE_AUTO };

enum dvbs2_fectype { DVBS2_64K, DVBS2_16K };

enum dvbs2_mod_cod {
        DVBS2_DUMMY_PLF, DVBS2_QPSK_1_4, DVBS2_QPSK_1_3, DVBS2_QPSK_2_5,
        DVBS2_QPSK_1_2, DVBS2_QPSK_3_5, DVBS2_QPSK_2_3, DVBS2_QPSK_3_4,
        DVBS2_QPSK_4_5, DVBS2_QPSK_5_6, DVBS2_QPSK_8_9, DVBS2_QPSK_9_10,
        DVBS2_8PSK_3_5, DVBS2_8PSK_2_3, DVBS2_8PSK_3_4, DVBS2_8PSK_5_6,
        DVBS2_8PSK_8_9, DVBS2_8PSK_9_10, DVBS2_16APSK_2_3, DVBS2_16APSK_3_4,
        DVBS2_16APSK_4_5, DVBS2_16APSK_5_6, DVBS2_16APSK_8_9, DVBS2_16APSK_9_10,
        DVBS2_32APSK_3_4, DVBS2_32APSK_4_5, DVBS2_32APSK_5_6, DVBS2_32APSK_8_9,
        DVBS2_32APSK_9_10
};

enum fe_stv0910_mod_cod {
        FE_DUMMY_PLF, FE_QPSK_14, FE_QPSK_13, FE_QPSK_25,
        FE_QPSK_12, FE_QPSK_35, FE_QPSK_23, FE_QPSK_34,
        FE_QPSK_45, FE_QPSK_56, FE_QPSK_89, FE_QPSK_910,
        FE_8PSK_35, FE_8PSK_23, FE_8PSK_34, FE_8PSK_56,
        FE_8PSK_89, FE_8PSK_910, FE_16APSK_23, FE_16APSK_34,
        FE_16APSK_45, FE_16APSK_56, FE_16APSK_89, FE_16APSK_910,
        FE_32APSK_34, FE_32APSK_45, FE_32APSK_56, FE_32APSK_89,
        FE_32APSK_910
};

enum fe_stv0910_roll_off { FE_SAT_35, FE_SAT_25, FE_SAT_20, FE_SAT_15 };

static inline u32 muldiv32(u32 a, u32 b, u32 c)
{
        u64 tmp64;

        tmp64 = (u64)a * (u64)b;
        do_div(tmp64, c);

        return (u32)tmp64;
}

struct stv_base {
        struct list_head     stvlist;

        u8                   adr;
        struct i2c_adapter  *i2c;
        struct mutex         i2c_lock; /* shared I2C access protect */
        struct mutex         reg_lock; /* shared register write protect */
        int                  count;

        u32                  extclk;
        u32                  mclk;
};

struct stv {
        struct stv_base     *base;
        struct dvb_frontend  fe;
        int                  nr;
        u16                  regoff;
        u8                   i2crpt;
        u8                   tscfgh;
        u8                   tsgeneral;
        u8                   tsspeed;
        u8                   single;
        unsigned long        tune_time;

        s32                  search_range;
        u32                  started;
        u32                  demod_lock_time;
        enum receive_mode    receive_mode;
        u32                  demod_timeout;
        u32                  fec_timeout;
        u32                  first_time_lock;
        u8                   demod_bits;
        u32                  symbol_rate;

        u8                       last_viterbi_rate;
        enum fe_code_rate        puncture_rate;
        enum fe_stv0910_mod_cod  mod_cod;
        enum dvbs2_fectype       fectype;
        u32                      pilots;
        enum fe_stv0910_roll_off feroll_off;

        int   is_standard_broadcast;
        int   is_vcm;

        u32   cur_scrambling_code;

        u32   last_bernumerator;
        u32   last_berdenominator;
        u8    berscale;

        u8    vth[6];
};

struct sinit_table {
        u16  address;
        u8   data;
};

struct slookup {
        s16  value;
        u32  reg_value;
};

static int write_reg(struct stv *state, u16 reg, u8 val)
{
        struct i2c_adapter *adap = state->base->i2c;
        u8 data[3] = {reg >> 8, reg & 0xff, val};
        struct i2c_msg msg = {.addr = state->base->adr, .flags = 0,
                              .buf = data, .len = 3};

        if (i2c_transfer(adap, &msg, 1) != 1) {
                dev_warn(&adap->dev, "i2c write error ([%02x] %04x: %02x)\n",
                         state->base->adr, reg, val);
                return -EIO;
        }
        return 0;
}

static inline int i2c_read_regs16(struct i2c_adapter *adapter, u8 adr,
                                  u16 reg, u8 *val, int count)
{
        u8 msg[2] = {reg >> 8, reg & 0xff};
        struct i2c_msg msgs[2] = {{.addr = adr, .flags = 0,
                                   .buf  = msg, .len   = 2},
                                  {.addr = adr, .flags = I2C_M_RD,
                                   .buf  = val, .len   = count } };

        if (i2c_transfer(adapter, msgs, 2) != 2) {
                dev_warn(&adapter->dev, "i2c read error ([%02x] %04x)\n",
                         adr, reg);
                return -EIO;
        }
        return 0;
}

static int read_reg(struct stv *state, u16 reg, u8 *val)
{
        return i2c_read_regs16(state->base->i2c, state->base->adr,
                               reg, val, 1);
}

static int read_regs(struct stv *state, u16 reg, u8 *val, int len)
{
        return i2c_read_regs16(state->base->i2c, state->base->adr,
                               reg, val, len);
}

static int write_shared_reg(struct stv *state, u16 reg, u8 mask, u8 val)
{
        int status;
        u8 tmp;

        mutex_lock(&state->base->reg_lock);
        status = read_reg(state, reg, &tmp);
        if (!status)
                status = write_reg(state, reg, (tmp & ~mask) | (val & mask));
        mutex_unlock(&state->base->reg_lock);
        return status;
}

static int write_field(struct stv *state, u32 field, u8 val)
{
        int status;
        u8 shift, mask, old, new;

        status = read_reg(state, field >> 16, &old);
        if (status)
                return status;
        mask = field & 0xff;
        shift = (field >> 12) & 0xf;
        new = ((val << shift) & mask) | (old & ~mask);
        if (new == old)
                return 0;
        return write_reg(state, field >> 16, new);
}

#define SET_FIELD(_reg, _val)                                   \
        write_field(state, state->nr ? FSTV0910_P2_##_reg :     \
                    FSTV0910_P1_##_reg, _val)

#define SET_REG(_reg, _val)                                     \
        write_reg(state, state->nr ? RSTV0910_P2_##_reg :       \
                  RSTV0910_P1_##_reg, _val)

#define GET_REG(_reg, _val)                                     \
        read_reg(state, state->nr ? RSTV0910_P2_##_reg :        \
                 RSTV0910_P1_##_reg, _val)

static const struct slookup s1_sn_lookup[] = {
        {   0,    9242  }, /* C/N=   0dB */
        {   5,    9105  }, /* C/N= 0.5dB */
        {  10,    8950  }, /* C/N= 1.0dB */
        {  15,    8780  }, /* C/N= 1.5dB */
        {  20,    8566  }, /* C/N= 2.0dB */
        {  25,    8366  }, /* C/N= 2.5dB */
        {  30,    8146  }, /* C/N= 3.0dB */
        {  35,    7908  }, /* C/N= 3.5dB */
        {  40,    7666  }, /* C/N= 4.0dB */
        {  45,    7405  }, /* C/N= 4.5dB */
        {  50,    7136  }, /* C/N= 5.0dB */
        {  55,    6861  }, /* C/N= 5.5dB */
        {  60,    6576  }, /* C/N= 6.0dB */
        {  65,    6330  }, /* C/N= 6.5dB */
        {  70,    6048  }, /* C/N= 7.0dB */
        {  75,    5768  }, /* C/N= 7.5dB */
        {  80,    5492  }, /* C/N= 8.0dB */
        {  85,    5224  }, /* C/N= 8.5dB */
        {  90,    4959  }, /* C/N= 9.0dB */
        {  95,    4709  }, /* C/N= 9.5dB */
        {  100,   4467  }, /* C/N=10.0dB */
        {  105,   4236  }, /* C/N=10.5dB */
        {  110,   4013  }, /* C/N=11.0dB */
        {  115,   3800  }, /* C/N=11.5dB */
        {  120,   3598  }, /* C/N=12.0dB */
        {  125,   3406  }, /* C/N=12.5dB */
        {  130,   3225  }, /* C/N=13.0dB */
        {  135,   3052  }, /* C/N=13.5dB */
        {  140,   2889  }, /* C/N=14.0dB */
        {  145,   2733  }, /* C/N=14.5dB */
        {  150,   2587  }, /* C/N=15.0dB */
        {  160,   2318  }, /* C/N=16.0dB */
        {  170,   2077  }, /* C/N=17.0dB */
        {  180,   1862  }, /* C/N=18.0dB */
        {  190,   1670  }, /* C/N=19.0dB */
        {  200,   1499  }, /* C/N=20.0dB */
        {  210,   1347  }, /* C/N=21.0dB */
        {  220,   1213  }, /* C/N=22.0dB */
        {  230,   1095  }, /* C/N=23.0dB */
        {  240,    992  }, /* C/N=24.0dB */
        {  250,    900  }, /* C/N=25.0dB */
        {  260,    826  }, /* C/N=26.0dB */
        {  270,    758  }, /* C/N=27.0dB */
        {  280,    702  }, /* C/N=28.0dB */
        {  290,    653  }, /* C/N=29.0dB */
        {  300,    613  }, /* C/N=30.0dB */
        {  310,    579  }, /* C/N=31.0dB */
        {  320,    550  }, /* C/N=32.0dB */
        {  330,    526  }, /* C/N=33.0dB */
        {  350,    490  }, /* C/N=33.0dB */
        {  400,    445  }, /* C/N=40.0dB */
        {  450,    430  }, /* C/N=45.0dB */
        {  500,    426  }, /* C/N=50.0dB */
        {  510,    425  }  /* C/N=51.0dB */
};

static const struct slookup s2_sn_lookup[] = {
        {  -30,  13950  }, /* C/N=-2.5dB */
        {  -25,  13580  }, /* C/N=-2.5dB */
        {  -20,  13150  }, /* C/N=-2.0dB */
        {  -15,  12760  }, /* C/N=-1.5dB */
        {  -10,  12345  }, /* C/N=-1.0dB */
        {   -5,  11900  }, /* C/N=-0.5dB */
        {    0,  11520  }, /* C/N=   0dB */
        {    5,  11080  }, /* C/N= 0.5dB */
        {   10,  10630  }, /* C/N= 1.0dB */
        {   15,  10210  }, /* C/N= 1.5dB */
        {   20,   9790  }, /* C/N= 2.0dB */
        {   25,   9390  }, /* C/N= 2.5dB */
        {   30,   8970  }, /* C/N= 3.0dB */
        {   35,   8575  }, /* C/N= 3.5dB */
        {   40,   8180  }, /* C/N= 4.0dB */
        {   45,   7800  }, /* C/N= 4.5dB */
        {   50,   7430  }, /* C/N= 5.0dB */
        {   55,   7080  }, /* C/N= 5.5dB */
        {   60,   6720  }, /* C/N= 6.0dB */
        {   65,   6320  }, /* C/N= 6.5dB */
        {   70,   6060  }, /* C/N= 7.0dB */
        {   75,   5760  }, /* C/N= 7.5dB */
        {   80,   5480  }, /* C/N= 8.0dB */
        {   85,   5200  }, /* C/N= 8.5dB */
        {   90,   4930  }, /* C/N= 9.0dB */
        {   95,   4680  }, /* C/N= 9.5dB */
        {  100,   4425  }, /* C/N=10.0dB */
        {  105,   4210  }, /* C/N=10.5dB */
        {  110,   3980  }, /* C/N=11.0dB */
        {  115,   3765  }, /* C/N=11.5dB */
        {  120,   3570  }, /* C/N=12.0dB */
        {  125,   3315  }, /* C/N=12.5dB */
        {  130,   3140  }, /* C/N=13.0dB */
        {  135,   2980  }, /* C/N=13.5dB */
        {  140,   2820  }, /* C/N=14.0dB */
        {  145,   2670  }, /* C/N=14.5dB */
        {  150,   2535  }, /* C/N=15.0dB */
        {  160,   2270  }, /* C/N=16.0dB */
        {  170,   2035  }, /* C/N=17.0dB */
        {  180,   1825  }, /* C/N=18.0dB */
        {  190,   1650  }, /* C/N=19.0dB */
        {  200,   1485  }, /* C/N=20.0dB */
        {  210,   1340  }, /* C/N=21.0dB */
        {  220,   1212  }, /* C/N=22.0dB */
        {  230,   1100  }, /* C/N=23.0dB */
        {  240,   1000  }, /* C/N=24.0dB */
        {  250,    910  }, /* C/N=25.0dB */
        {  260,    836  }, /* C/N=26.0dB */
        {  270,    772  }, /* C/N=27.0dB */
        {  280,    718  }, /* C/N=28.0dB */
        {  290,    671  }, /* C/N=29.0dB */
        {  300,    635  }, /* C/N=30.0dB */
        {  310,    602  }, /* C/N=31.0dB */
        {  320,    575  }, /* C/N=32.0dB */
        {  330,    550  }, /* C/N=33.0dB */
        {  350,    517  }, /* C/N=35.0dB */
        {  400,    480  }, /* C/N=40.0dB */
        {  450,    466  }, /* C/N=45.0dB */
        {  500,    464  }, /* C/N=50.0dB */
        {  510,    463  }, /* C/N=51.0dB */
};

static const struct slookup padc_lookup[] = {
        {    0,  118000 }, /* PADC= +0dBm */
        { -100,  93600  }, /* PADC= -1dBm */
        { -200,  74500  }, /* PADC= -2dBm */
        { -300,  59100  }, /* PADC= -3dBm */
        { -400,  47000  }, /* PADC= -4dBm */
        { -500,  37300  }, /* PADC= -5dBm */
        { -600,  29650  }, /* PADC= -6dBm */
        { -700,  23520  }, /* PADC= -7dBm */
        { -900,  14850  }, /* PADC= -9dBm */
        { -1100, 9380   }, /* PADC=-11dBm */
        { -1300, 5910   }, /* PADC=-13dBm */
        { -1500, 3730   }, /* PADC=-15dBm */
        { -1700, 2354   }, /* PADC=-17dBm */
        { -1900, 1485   }, /* PADC=-19dBm */
        { -2000, 1179   }, /* PADC=-20dBm */
        { -2100, 1000   }, /* PADC=-21dBm */
};

/*********************************************************************
 * Tracking carrier loop carrier QPSK 1/4 to 8PSK 9/10 long Frame
 *********************************************************************/
static const u8 s2car_loop[] =  {
        /*
         * Modcod  2MPon 2MPoff 5MPon 5MPoff 10MPon 10MPoff
         * 20MPon 20MPoff 30MPon 30MPoff
         */

        /* FE_QPSK_14  */
        0x0C,  0x3C,  0x0B,  0x3C,  0x2A,  0x2C,  0x2A,  0x1C,  0x3A,  0x3B,
        /* FE_QPSK_13  */
        0x0C,  0x3C,  0x0B,  0x3C,  0x2A,  0x2C,  0x3A,  0x0C,  0x3A,  0x2B,
        /* FE_QPSK_25  */
        0x1C,  0x3C,  0x1B,  0x3C,  0x3A,  0x1C,  0x3A,  0x3B,  0x3A,  0x2B,
        /* FE_QPSK_12  */
        0x0C,  0x1C,  0x2B,  0x1C,  0x0B,  0x2C,  0x0B,  0x0C,  0x2A,  0x2B,
        /* FE_QPSK_35  */
        0x1C,  0x1C,  0x2B,  0x1C,  0x0B,  0x2C,  0x0B,  0x0C,  0x2A,  0x2B,
        /* FE_QPSK_23  */
        0x2C,  0x2C,  0x2B,  0x1C,  0x0B,  0x2C,  0x0B,  0x0C,  0x2A,  0x2B,
        /* FE_QPSK_34  */
        0x3C,  0x2C,  0x3B,  0x2C,  0x1B,  0x1C,  0x1B,  0x3B,  0x3A,  0x1B,
        /* FE_QPSK_45  */
        0x0D,  0x3C,  0x3B,  0x2C,  0x1B,  0x1C,  0x1B,  0x3B,  0x3A,  0x1B,
        /* FE_QPSK_56  */
        0x1D,  0x3C,  0x0C,  0x2C,  0x2B,  0x1C,  0x1B,  0x3B,  0x0B,  0x1B,
        /* FE_QPSK_89  */
        0x3D,  0x0D,  0x0C,  0x2C,  0x2B,  0x0C,  0x2B,  0x2B,  0x0B,  0x0B,
        /* FE_QPSK_910 */
        0x1E,  0x0D,  0x1C,  0x2C,  0x3B,  0x0C,  0x2B,  0x2B,  0x1B,  0x0B,
        /* FE_8PSK_35  */
        0x28,  0x09,  0x28,  0x09,  0x28,  0x09,  0x28,  0x08,  0x28,  0x27,
        /* FE_8PSK_23  */
        0x19,  0x29,  0x19,  0x29,  0x19,  0x29,  0x38,  0x19,  0x28,  0x09,
        /* FE_8PSK_34  */
        0x1A,  0x0B,  0x1A,  0x3A,  0x0A,  0x2A,  0x39,  0x2A,  0x39,  0x1A,
        /* FE_8PSK_56  */
        0x2B,  0x2B,  0x1B,  0x1B,  0x0B,  0x1B,  0x1A,  0x0B,  0x1A,  0x1A,
        /* FE_8PSK_89  */
        0x0C,  0x0C,  0x3B,  0x3B,  0x1B,  0x1B,  0x2A,  0x0B,  0x2A,  0x2A,
        /* FE_8PSK_910 */
        0x0C,  0x1C,  0x0C,  0x3B,  0x2B,  0x1B,  0x3A,  0x0B,  0x2A,  0x2A,

        /**********************************************************************
         * Tracking carrier loop carrier 16APSK 2/3 to 32APSK 9/10 long Frame
         **********************************************************************/

        /*
         * Modcod 2MPon  2MPoff 5MPon 5MPoff 10MPon 10MPoff 20MPon
         * 20MPoff 30MPon 30MPoff
         */

        /* FE_16APSK_23  */
        0x0A,  0x0A,  0x0A,  0x0A,  0x1A,  0x0A,  0x39,  0x0A,  0x29,  0x0A,
        /* FE_16APSK_34  */
        0x0A,  0x0A,  0x0A,  0x0A,  0x0B,  0x0A,  0x2A,  0x0A,  0x1A,  0x0A,
        /* FE_16APSK_45  */
        0x0A,  0x0A,  0x0A,  0x0A,  0x1B,  0x0A,  0x3A,  0x0A,  0x2A,  0x0A,
        /* FE_16APSK_56  */
        0x0A,  0x0A,  0x0A,  0x0A,  0x1B,  0x0A,  0x3A,  0x0A,  0x2A,  0x0A,
        /* FE_16APSK_89  */
        0x0A,  0x0A,  0x0A,  0x0A,  0x2B,  0x0A,  0x0B,  0x0A,  0x3A,  0x0A,
        /* FE_16APSK_910 */
        0x0A,  0x0A,  0x0A,  0x0A,  0x2B,  0x0A,  0x0B,  0x0A,  0x3A,  0x0A,
        /* FE_32APSK_34  */
        0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,
        /* FE_32APSK_45  */
        0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,
        /* FE_32APSK_56  */
        0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,
        /* FE_32APSK_89  */
        0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,
        /* FE_32APSK_910 */
        0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,  0x09,
};

static u8 get_optim_cloop(struct stv *state,
                          enum fe_stv0910_mod_cod mod_cod, u32 pilots)
{
        int i = 0;

        if (mod_cod >= FE_32APSK_910)
                i = ((int)FE_32APSK_910 - (int)FE_QPSK_14) * 10;
        else if (mod_cod >= FE_QPSK_14)
                i = ((int)mod_cod - (int)FE_QPSK_14) * 10;

        if (state->symbol_rate <= 3000000)
                i += 0;
        else if (state->symbol_rate <=  7000000)
                i += 2;
        else if (state->symbol_rate <= 15000000)
                i += 4;
        else if (state->symbol_rate <= 25000000)
                i += 6;
        else
                i += 8;

        if (!pilots)
                i += 1;

        return s2car_loop[i];
}

static int get_cur_symbol_rate(struct stv *state, u32 *p_symbol_rate)
{
        int status = 0;
        u8 symb_freq0;
        u8 symb_freq1;
        u8 symb_freq2;
        u8 symb_freq3;
        u8 tim_offs0;
        u8 tim_offs1;
        u8 tim_offs2;
        u32 symbol_rate;
        s32 timing_offset;

        *p_symbol_rate = 0;
        if (!state->started)
                return status;

        read_reg(state, RSTV0910_P2_SFR3 + state->regoff, &symb_freq3);
        read_reg(state, RSTV0910_P2_SFR2 + state->regoff, &symb_freq2);
        read_reg(state, RSTV0910_P2_SFR1 + state->regoff, &symb_freq1);
        read_reg(state, RSTV0910_P2_SFR0 + state->regoff, &symb_freq0);
        read_reg(state, RSTV0910_P2_TMGREG2 + state->regoff, &tim_offs2);
        read_reg(state, RSTV0910_P2_TMGREG1 + state->regoff, &tim_offs1);
        read_reg(state, RSTV0910_P2_TMGREG0 + state->regoff, &tim_offs0);

        symbol_rate = ((u32)symb_freq3 << 24) | ((u32)symb_freq2 << 16) |
                ((u32)symb_freq1 << 8) | (u32)symb_freq0;
        timing_offset = ((u32)tim_offs2 << 16) | ((u32)tim_offs1 << 8) |
                (u32)tim_offs0;

        if ((timing_offset & (1 << 23)) != 0)
                timing_offset |= 0xFF000000; /* Sign extent */

        symbol_rate = (u32)(((u64)symbol_rate * state->base->mclk) >> 32);
        timing_offset = (s32)(((s64)symbol_rate * (s64)timing_offset) >> 29);

        *p_symbol_rate = symbol_rate + timing_offset;

        return 0;
}

static int get_signal_parameters(struct stv *state)
{
        u8 tmp;

        if (!state->started)
                return -EINVAL;

        if (state->receive_mode == RCVMODE_DVBS2) {
                read_reg(state, RSTV0910_P2_DMDMODCOD + state->regoff, &tmp);
                state->mod_cod = (enum fe_stv0910_mod_cod)((tmp & 0x7c) >> 2);
                state->pilots = (tmp & 0x01) != 0;
                state->fectype = (enum dvbs2_fectype)((tmp & 0x02) >> 1);

        } else if (state->receive_mode == RCVMODE_DVBS) {
                read_reg(state, RSTV0910_P2_VITCURPUN + state->regoff, &tmp);
                state->puncture_rate = FEC_NONE;
                switch (tmp & 0x1F) {
                case 0x0d:
                        state->puncture_rate = FEC_1_2;
                        break;
                case 0x12:
                        state->puncture_rate = FEC_2_3;
                        break;
                case 0x15:
                        state->puncture_rate = FEC_3_4;
                        break;
                case 0x18:
                        state->puncture_rate = FEC_5_6;
                        break;
                case 0x1a:
                        state->puncture_rate = FEC_7_8;
                        break;
                }
                state->is_vcm = 0;
                state->is_standard_broadcast = 1;
                state->feroll_off = FE_SAT_35;
        }
        return 0;
}

static int tracking_optimization(struct stv *state)
{
        u8 tmp;

        read_reg(state, RSTV0910_P2_DMDCFGMD + state->regoff, &tmp);
        tmp &= ~0xC0;

        switch (state->receive_mode) {
        case RCVMODE_DVBS:
                tmp |= 0x40;
                break;
        case RCVMODE_DVBS2:
                tmp |= 0x80;
                break;
        default:
                tmp |= 0xC0;
                break;
        }
        write_reg(state, RSTV0910_P2_DMDCFGMD + state->regoff, tmp);

        if (state->receive_mode == RCVMODE_DVBS2) {
                /* Disable Reed-Solomon */
                write_shared_reg(state,
                                 RSTV0910_TSTTSRS, state->nr ? 0x02 : 0x01,
                                 0x03);

                if (state->fectype == DVBS2_64K) {
                        u8 aclc = get_optim_cloop(state, state->mod_cod,
                                                  state->pilots);

                        if (state->mod_cod <= FE_QPSK_910) {
                                write_reg(state, RSTV0910_P2_ACLC2S2Q +
                                          state->regoff, aclc);
                        } else if (state->mod_cod <= FE_8PSK_910) {
                                write_reg(state, RSTV0910_P2_ACLC2S2Q +
                                          state->regoff, 0x2a);
                                write_reg(state, RSTV0910_P2_ACLC2S28 +
                                          state->regoff, aclc);
                        } else if (state->mod_cod <= FE_16APSK_910) {
                                write_reg(state, RSTV0910_P2_ACLC2S2Q +
                                          state->regoff, 0x2a);
                                write_reg(state, RSTV0910_P2_ACLC2S216A +
                                          state->regoff, aclc);
                        } else if (state->mod_cod <= FE_32APSK_910) {
                                write_reg(state, RSTV0910_P2_ACLC2S2Q +
                                          state->regoff, 0x2a);
                                write_reg(state, RSTV0910_P2_ACLC2S232A +
                                          state->regoff, aclc);
                        }
                }
        }
        return 0;
}

static s32 table_lookup(const struct slookup *table,
                        int table_size, u32 reg_value)
{
        s32 value;
        int imin = 0;
        int imax = table_size - 1;
        int i;
        s32 reg_diff;

        /* Assumes Table[0].RegValue > Table[imax].RegValue */
        if (reg_value >= table[0].reg_value) {
                value = table[0].value;
        } else if (reg_value <= table[imax].reg_value) {
                value = table[imax].value;
        } else {
                while ((imax - imin) > 1) {
                        i = (imax + imin) / 2;
                        if ((table[imin].reg_value >= reg_value) &&
                            (reg_value >= table[i].reg_value))
                                imax = i;
                        else
                                imin = i;
                }

                reg_diff = table[imax].reg_value - table[imin].reg_value;
                value = table[imin].value;
                if (reg_diff != 0)
                        value += ((s32)(reg_value - table[imin].reg_value) *
                                  (s32)(table[imax].value
                                        - table[imin].value))
                                        / (reg_diff);
        }

        return value;
}

static int get_signal_to_noise(struct stv *state, s32 *signal_to_noise)
{
        u8 data0;
        u8 data1;
        u16 data;
        int n_lookup;
        const struct slookup *lookup;

        *signal_to_noise = 0;

        if (!state->started)
                return -EINVAL;

        if (state->receive_mode == RCVMODE_DVBS2) {
                read_reg(state, RSTV0910_P2_NNOSPLHT1 + state->regoff,
                         &data1);
                read_reg(state, RSTV0910_P2_NNOSPLHT0 + state->regoff,
                         &data0);
                n_lookup = ARRAY_SIZE(s2_sn_lookup);
                lookup = s2_sn_lookup;
        } else {
                read_reg(state, RSTV0910_P2_NNOSDATAT1 + state->regoff,
                         &data1);
                read_reg(state, RSTV0910_P2_NNOSDATAT0 + state->regoff,
                         &data0);
                n_lookup = ARRAY_SIZE(s1_sn_lookup);
                lookup = s1_sn_lookup;
        }
        data = (((u16)data1) << 8) | (u16)data0;
        *signal_to_noise = table_lookup(lookup, n_lookup, data);
        return 0;
}

static int get_bit_error_rate_s(struct stv *state, u32 *bernumerator,
                                u32 *berdenominator)
{
        u8 regs[3];

        int status = read_regs(state,
                               RSTV0910_P2_ERRCNT12 + state->regoff,
                               regs, 3);

        if (status)
                return -EINVAL;

        if ((regs[0] & 0x80) == 0) {
                state->last_berdenominator = 1ULL << ((state->berscale * 2) +
                                                     10 + 3);
                state->last_bernumerator = ((u32)(regs[0] & 0x7F) << 16) |
                        ((u32)regs[1] << 8) | regs[2];
                if (state->last_bernumerator < 256 && state->berscale < 6) {
                        state->berscale += 1;
                        status = write_reg(state, RSTV0910_P2_ERRCTRL1 +
                                           state->regoff,
                                           0x20 | state->berscale);
                } else if (state->last_bernumerator > 1024 &&
                           state->berscale > 2) {
                        state->berscale -= 1;
                        status = write_reg(state, RSTV0910_P2_ERRCTRL1 +
                                           state->regoff, 0x20 |
                                           state->berscale);
                }
        }
        *bernumerator = state->last_bernumerator;
        *berdenominator = state->last_berdenominator;
        return 0;
}

static u32 dvbs2_nbch(enum dvbs2_mod_cod mod_cod, enum dvbs2_fectype fectype)
{
        static const u32 nbch[][2] = {
                {    0,     0}, /* DUMMY_PLF   */
                {16200,  3240}, /* QPSK_1_4,   */
                {21600,  5400}, /* QPSK_1_3,   */
                {25920,  6480}, /* QPSK_2_5,   */
                {32400,  7200}, /* QPSK_1_2,   */
                {38880,  9720}, /* QPSK_3_5,   */
                {43200, 10800}, /* QPSK_2_3,   */
                {48600, 11880}, /* QPSK_3_4,   */
                {51840, 12600}, /* QPSK_4_5,   */
                {54000, 13320}, /* QPSK_5_6,   */
                {57600, 14400}, /* QPSK_8_9,   */
                {58320, 16000}, /* QPSK_9_10,  */
                {43200,  9720}, /* 8PSK_3_5,   */
                {48600, 10800}, /* 8PSK_2_3,   */
                {51840, 11880}, /* 8PSK_3_4,   */
                {54000, 13320}, /* 8PSK_5_6,   */
                {57600, 14400}, /* 8PSK_8_9,   */
                {58320, 16000}, /* 8PSK_9_10,  */
                {43200, 10800}, /* 16APSK_2_3, */
                {48600, 11880}, /* 16APSK_3_4, */
                {51840, 12600}, /* 16APSK_4_5, */
                {54000, 13320}, /* 16APSK_5_6, */
                {57600, 14400}, /* 16APSK_8_9, */
                {58320, 16000}, /* 16APSK_9_10 */
                {48600, 11880}, /* 32APSK_3_4, */
                {51840, 12600}, /* 32APSK_4_5, */
                {54000, 13320}, /* 32APSK_5_6, */
                {57600, 14400}, /* 32APSK_8_9, */
                {58320, 16000}, /* 32APSK_9_10 */
        };

        if (mod_cod >= DVBS2_QPSK_1_4 &&
            mod_cod <= DVBS2_32APSK_9_10 && fectype <= DVBS2_16K)
                return nbch[mod_cod][fectype];
        return 64800;
}

static int get_bit_error_rate_s2(struct stv *state, u32 *bernumerator,
                                 u32 *berdenominator)
{
        u8 regs[3];

        int status = read_regs(state, RSTV0910_P2_ERRCNT12 + state->regoff,
                               regs, 3);

        if (status)
                return -EINVAL;

        if ((regs[0] & 0x80) == 0) {
                state->last_berdenominator =
                        dvbs2_nbch((enum dvbs2_mod_cod)state->mod_cod,
                                   state->fectype) <<
                        (state->berscale * 2);
                state->last_bernumerator = (((u32)regs[0] & 0x7F) << 16) |
                        ((u32)regs[1] << 8) | regs[2];
                if (state->last_bernumerator < 256 && state->berscale < 6) {
                        state->berscale += 1;
                        write_reg(state, RSTV0910_P2_ERRCTRL1 + state->regoff,
                                  0x20 | state->berscale);
                } else if (state->last_bernumerator > 1024 &&
                           state->berscale > 2) {
                        state->berscale -= 1;
                        write_reg(state, RSTV0910_P2_ERRCTRL1 + state->regoff,
                                  0x20 | state->berscale);
                }
        }
        *bernumerator = state->last_bernumerator;
        *berdenominator = state->last_berdenominator;
        return status;
}

static int get_bit_error_rate(struct stv *state, u32 *bernumerator,
                              u32 *berdenominator)
{
        *bernumerator = 0;
        *berdenominator = 1;

        switch (state->receive_mode) {
        case RCVMODE_DVBS:
                return get_bit_error_rate_s(state,
                                            bernumerator, berdenominator);
        case RCVMODE_DVBS2:
                return get_bit_error_rate_s2(state,
                                             bernumerator, berdenominator);
        default:
                break;
        }
        return 0;
}

static int set_mclock(struct stv *state, u32 master_clock)
{
        u32 idf = 1;
        u32 odf = 4;
        u32 quartz = state->base->extclk / 1000000;
        u32 fphi = master_clock / 1000000;
        u32 ndiv = (fphi * odf * idf) / quartz;
        u32 cp = 7;
        u32 fvco;

        if (ndiv >= 7 && ndiv <= 71)
                cp = 7;
        else if (ndiv >=  72 && ndiv <=  79)
                cp = 8;
        else if (ndiv >=  80 && ndiv <=  87)
                cp = 9;
        else if (ndiv >=  88 && ndiv <=  95)
                cp = 10;
        else if (ndiv >=  96 && ndiv <= 103)
                cp = 11;
        else if (ndiv >= 104 && ndiv <= 111)
                cp = 12;
        else if (ndiv >= 112 && ndiv <= 119)
                cp = 13;
        else if (ndiv >= 120 && ndiv <= 127)
                cp = 14;
        else if (ndiv >= 128 && ndiv <= 135)
                cp = 15;
        else if (ndiv >= 136 && ndiv <= 143)
                cp = 16;
        else if (ndiv >= 144 && ndiv <= 151)
                cp = 17;
        else if (ndiv >= 152 && ndiv <= 159)
                cp = 18;
        else if (ndiv >= 160 && ndiv <= 167)
                cp = 19;
        else if (ndiv >= 168 && ndiv <= 175)
                cp = 20;
        else if (ndiv >= 176 && ndiv <= 183)
                cp = 21;
        else if (ndiv >= 184 && ndiv <= 191)
                cp = 22;
        else if (ndiv >= 192 && ndiv <= 199)
                cp = 23;
        else if (ndiv >= 200 && ndiv <= 207)
                cp = 24;
        else if (ndiv >= 208 && ndiv <= 215)
                cp = 25;
        else if (ndiv >= 216 && ndiv <= 223)
                cp = 26;
        else if (ndiv >= 224 && ndiv <= 225)
                cp = 27;

        write_reg(state, RSTV0910_NCOARSE, (cp << 3) | idf);
        write_reg(state, RSTV0910_NCOARSE2, odf);
        write_reg(state, RSTV0910_NCOARSE1, ndiv);

        fvco = (quartz * 2 * ndiv) / idf;
        state->base->mclk = fvco / (2 * odf) * 1000000;

        return 0;
}

static int stop(struct stv *state)
{
        if (state->started) {
                u8 tmp;

                write_reg(state, RSTV0910_P2_TSCFGH + state->regoff,
                          state->tscfgh | 0x01);
                read_reg(state, RSTV0910_P2_PDELCTRL1 + state->regoff, &tmp);
                tmp &= ~0x01; /* release reset DVBS2 packet delin */
                write_reg(state, RSTV0910_P2_PDELCTRL1 + state->regoff, tmp);
                /* Blind optim*/
                write_reg(state, RSTV0910_P2_AGC2O + state->regoff, 0x5B);
                /* Stop the demod */
                write_reg(state, RSTV0910_P2_DMDISTATE + state->regoff, 0x5c);
                state->started = 0;
        }
        state->receive_mode = RCVMODE_NONE;
        return 0;
}

static void set_pls(struct stv *state, u32 pls_code)
{
        if (pls_code == state->cur_scrambling_code)
                return;

        /* PLROOT2 bit 2 = gold code */
        write_reg(state, RSTV0910_P2_PLROOT0 + state->regoff,
                  pls_code & 0xff);
        write_reg(state, RSTV0910_P2_PLROOT1 + state->regoff,
                  (pls_code >> 8) & 0xff);
        write_reg(state, RSTV0910_P2_PLROOT2 + state->regoff,
                  0x04 | ((pls_code >> 16) & 0x03));
        state->cur_scrambling_code = pls_code;
}

static void set_isi(struct stv *state, u32 isi)
{
        if (isi == NO_STREAM_ID_FILTER)
                return;
        if (isi == 0x80000000) {
                SET_FIELD(FORCE_CONTINUOUS, 1);
                SET_FIELD(TSOUT_NOSYNC, 1);
        } else {
                SET_FIELD(FILTER_EN, 1);
                write_reg(state, RSTV0910_P2_ISIENTRY + state->regoff,
                          isi & 0xff);
                write_reg(state, RSTV0910_P2_ISIBITENA + state->regoff, 0xff);
        }
        SET_FIELD(ALGOSWRST, 1);
        SET_FIELD(ALGOSWRST, 0);
}

static void set_stream_modes(struct stv *state,
                             struct dtv_frontend_properties *p)
{
        set_isi(state, p->stream_id);
        set_pls(state, p->scrambling_sequence_index);
}

static int init_search_param(struct stv *state,
                             struct dtv_frontend_properties *p)
{
        SET_FIELD(FORCE_CONTINUOUS, 0);
        SET_FIELD(FRAME_MODE, 0);
        SET_FIELD(FILTER_EN, 0);
        SET_FIELD(TSOUT_NOSYNC, 0);
        SET_FIELD(TSFIFO_EMBINDVB, 0);
        SET_FIELD(TSDEL_SYNCBYTE, 0);
        SET_REG(UPLCCST0, 0xe0);
        SET_FIELD(TSINS_TOKEN, 0);
        SET_FIELD(HYSTERESIS_THRESHOLD, 0);
        SET_FIELD(ISIOBS_MODE, 1);

        set_stream_modes(state, p);
        return 0;
}

static int enable_puncture_rate(struct stv *state, enum fe_code_rate rate)
{
        u8 val;

        switch (rate) {
        case FEC_1_2:
                val = 0x01;
                break;
        case FEC_2_3:
                val = 0x02;
                break;
        case FEC_3_4:
                val = 0x04;
                break;
        case FEC_5_6:
                val = 0x08;
                break;
        case FEC_7_8:
                val = 0x20;
                break;
        case FEC_NONE:
        default:
                val = 0x2f;
                break;
        }

        return write_reg(state, RSTV0910_P2_PRVIT + state->regoff, val);
}

static int set_vth_default(struct stv *state)
{
        state->vth[0] = 0xd7;
        state->vth[1] = 0x85;
        state->vth[2] = 0x58;
        state->vth[3] = 0x3a;
        state->vth[4] = 0x34;
        state->vth[5] = 0x28;
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 0, state->vth[0]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 1, state->vth[1]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 2, state->vth[2]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 3, state->vth[3]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 4, state->vth[4]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 5, state->vth[5]);
        return 0;
}

static int set_vth(struct stv *state)
{
        static const struct slookup vthlookup_table[] = {
                {250,   8780}, /* C/N= 1.5dB */
                {100,   7405}, /* C/N= 4.5dB */
                {40,    6330}, /* C/N= 6.5dB */
                {12,    5224}, /* C/N= 8.5dB */
                {5,     4236}  /* C/N=10.5dB */
        };

        int i;
        u8 tmp[2];
        int status = read_regs(state,
                               RSTV0910_P2_NNOSDATAT1 + state->regoff,

                               tmp, 2);
        u16 reg_value = (tmp[0] << 8) | tmp[1];
        s32 vth = table_lookup(vthlookup_table, ARRAY_SIZE(vthlookup_table),
                              reg_value);

        for (i = 0; i < 6; i += 1)
                if (state->vth[i] > vth)
                        state->vth[i] = vth;

        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 0, state->vth[0]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 1, state->vth[1]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 2, state->vth[2]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 3, state->vth[3]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 4, state->vth[4]);
        write_reg(state, RSTV0910_P2_VTH12 + state->regoff + 5, state->vth[5]);
        return status;
}

static int start(struct stv *state, struct dtv_frontend_properties *p)
{
        s32 freq;
        u8  reg_dmdcfgmd;
        u16 symb;

        if (p->symbol_rate < 100000 || p->symbol_rate > 70000000)
                return -EINVAL;

        state->receive_mode = RCVMODE_NONE;
        state->demod_lock_time = 0;

        /* Demod Stop */
        if (state->started)
                write_reg(state, RSTV0910_P2_DMDISTATE + state->regoff, 0x5C);

        init_search_param(state, p);

        if (p->symbol_rate <= 1000000) { /* SR <=1Msps */
                state->demod_timeout = 3000;
                state->fec_timeout = 2000;
        } else if (p->symbol_rate <= 2000000) { /* 1Msps < SR <=2Msps */
                state->demod_timeout = 2500;
                state->fec_timeout = 1300;
        } else if (p->symbol_rate <= 5000000) { /* 2Msps< SR <=5Msps */
                state->demod_timeout = 1000;
                state->fec_timeout = 650;
        } else if (p->symbol_rate <= 10000000) { /* 5Msps< SR <=10Msps */
                state->demod_timeout = 700;
                state->fec_timeout = 350;
        } else if (p->symbol_rate < 20000000) { /* 10Msps< SR <=20Msps */
                state->demod_timeout = 400;
                state->fec_timeout = 200;
        } else { /* SR >=20Msps */
                state->demod_timeout = 300;
                state->fec_timeout = 200;
        }

        /* Set the Init Symbol rate */
        symb = muldiv32(p->symbol_rate, 65536, state->base->mclk);
        write_reg(state, RSTV0910_P2_SFRINIT1 + state->regoff,
                  ((symb >> 8) & 0x7F));
        write_reg(state, RSTV0910_P2_SFRINIT0 + state->regoff, (symb & 0xFF));

        state->demod_bits |= 0x80;
        write_reg(state, RSTV0910_P2_DEMOD + state->regoff, state->demod_bits);

        /* FE_STV0910_SetSearchStandard */
        read_reg(state, RSTV0910_P2_DMDCFGMD + state->regoff, &reg_dmdcfgmd);
        write_reg(state, RSTV0910_P2_DMDCFGMD + state->regoff,
                  reg_dmdcfgmd |= 0xC0);

        write_shared_reg(state,
                         RSTV0910_TSTTSRS, state->nr ? 0x02 : 0x01, 0x00);

        /* Disable DSS */
        write_reg(state, RSTV0910_P2_FECM  + state->regoff, 0x00);
        write_reg(state, RSTV0910_P2_PRVIT + state->regoff, 0x2F);

        enable_puncture_rate(state, FEC_NONE);

        /* 8PSK 3/5, 8PSK 2/3 Poff tracking optimization WA */
        write_reg(state, RSTV0910_P2_ACLC2S2Q + state->regoff, 0x0B);
        write_reg(state, RSTV0910_P2_ACLC2S28 + state->regoff, 0x0A);
        write_reg(state, RSTV0910_P2_BCLC2S2Q + state->regoff, 0x84);
        write_reg(state, RSTV0910_P2_BCLC2S28 + state->regoff, 0x84);
        write_reg(state, RSTV0910_P2_CARHDR + state->regoff, 0x1C);
        write_reg(state, RSTV0910_P2_CARFREQ + state->regoff, 0x79);

        write_reg(state, RSTV0910_P2_ACLC2S216A + state->regoff, 0x29);
        write_reg(state, RSTV0910_P2_ACLC2S232A + state->regoff, 0x09);
        write_reg(state, RSTV0910_P2_BCLC2S216A + state->regoff, 0x84);
        write_reg(state, RSTV0910_P2_BCLC2S232A + state->regoff, 0x84);

        /*
         * Reset CAR3, bug DVBS2->DVBS1 lock
         * Note: The bit is only pulsed -> no lock on shared register needed
         */
        write_reg(state, RSTV0910_TSTRES0, state->nr ? 0x04 : 0x08);
        write_reg(state, RSTV0910_TSTRES0, 0);

        set_vth_default(state);
        /* Reset demod */
        write_reg(state, RSTV0910_P2_DMDISTATE + state->regoff, 0x1F);

        write_reg(state, RSTV0910_P2_CARCFG + state->regoff, 0x46);

        if (p->symbol_rate <= 5000000)
                freq = (state->search_range / 2000) + 80;
        else
                freq = (state->search_range / 2000) + 1600;
        freq = (freq << 16) / (state->base->mclk / 1000);

        write_reg(state, RSTV0910_P2_CFRUP1 + state->regoff,
                  (freq >> 8) & 0xff);
        write_reg(state, RSTV0910_P2_CFRUP0 + state->regoff, (freq & 0xff));
        /* CFR Low Setting */
        freq = -freq;
        write_reg(state, RSTV0910_P2_CFRLOW1 + state->regoff,
                  (freq >> 8) & 0xff);
        write_reg(state, RSTV0910_P2_CFRLOW0 + state->regoff, (freq & 0xff));

        /* init the demod frequency offset to 0 */
        write_reg(state, RSTV0910_P2_CFRINIT1 + state->regoff, 0);
        write_reg(state, RSTV0910_P2_CFRINIT0 + state->regoff, 0);

        write_reg(state, RSTV0910_P2_DMDISTATE + state->regoff, 0x1F);
        /* Trigger acq */
        write_reg(state, RSTV0910_P2_DMDISTATE + state->regoff, 0x15);

        state->demod_lock_time += TUNING_DELAY;
        state->started = 1;

        return 0;
}

static int init_diseqc(struct stv *state)
{
        u16 offs = state->nr ? 0x40 : 0; /* Address offset */
        u8 freq = ((state->base->mclk + 11000 * 32) / (22000 * 32));

        /* Disable receiver */
        write_reg(state, RSTV0910_P1_DISRXCFG + offs, 0x00);
        write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0xBA); /* Reset = 1 */
        write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0x3A); /* Reset = 0 */
        write_reg(state, RSTV0910_P1_DISTXF22 + offs, freq);
        return 0;
}

static int probe(struct stv *state)
{
        u8 id;

        state->receive_mode = RCVMODE_NONE;
        state->started = 0;

        if (read_reg(state, RSTV0910_MID, &id) < 0)
                return -ENODEV;

        if (id != 0x51)
                return -EINVAL;

        /* Configure the I2C repeater to off */
        write_reg(state, RSTV0910_P1_I2CRPT, 0x24);
        /* Configure the I2C repeater to off */
        write_reg(state, RSTV0910_P2_I2CRPT, 0x24);
        /* Set the I2C to oversampling ratio */
        write_reg(state, RSTV0910_I2CCFG, 0x88); /* state->i2ccfg */

        write_reg(state, RSTV0910_OUTCFG,    0x00); /* OUTCFG */
        write_reg(state, RSTV0910_PADCFG,    0x05); /* RFAGC Pads Dev = 05 */
        write_reg(state, RSTV0910_SYNTCTRL,  0x02); /* SYNTCTRL */
        write_reg(state, RSTV0910_TSGENERAL, state->tsgeneral); /* TSGENERAL */
        write_reg(state, RSTV0910_CFGEXT,    0x02); /* CFGEXT */

        if (state->single)
                write_reg(state, RSTV0910_GENCFG, 0x14); /* GENCFG */
        else
                write_reg(state, RSTV0910_GENCFG, 0x15); /* GENCFG */

        write_reg(state, RSTV0910_P1_TNRCFG2, 0x02); /* IQSWAP = 0 */
        write_reg(state, RSTV0910_P2_TNRCFG2, 0x82); /* IQSWAP = 1 */

        write_reg(state, RSTV0910_P1_CAR3CFG, 0x02);
        write_reg(state, RSTV0910_P2_CAR3CFG, 0x02);
        write_reg(state, RSTV0910_P1_DMDCFG4, 0x04);
        write_reg(state, RSTV0910_P2_DMDCFG4, 0x04);

        write_reg(state, RSTV0910_TSTRES0, 0x80); /* LDPC Reset */
        write_reg(state, RSTV0910_TSTRES0, 0x00);

        write_reg(state, RSTV0910_P1_TSPIDFLT1, 0x00);
        write_reg(state, RSTV0910_P2_TSPIDFLT1, 0x00);

        write_reg(state, RSTV0910_P1_TMGCFG2, 0x80);
        write_reg(state, RSTV0910_P2_TMGCFG2, 0x80);

        set_mclock(state, 135000000);

        /* TS output */
        write_reg(state, RSTV0910_P1_TSCFGH, state->tscfgh | 0x01);
        write_reg(state, RSTV0910_P1_TSCFGH, state->tscfgh);
        write_reg(state, RSTV0910_P1_TSCFGM, 0xC0); /* Manual speed */
        write_reg(state, RSTV0910_P1_TSCFGL, 0x20);

        write_reg(state, RSTV0910_P1_TSSPEED, state->tsspeed);

        write_reg(state, RSTV0910_P2_TSCFGH, state->tscfgh | 0x01);
        write_reg(state, RSTV0910_P2_TSCFGH, state->tscfgh);
        write_reg(state, RSTV0910_P2_TSCFGM, 0xC0); /* Manual speed */
        write_reg(state, RSTV0910_P2_TSCFGL, 0x20);

        write_reg(state, RSTV0910_P2_TSSPEED, state->tsspeed);

        /* Reset stream merger */
        write_reg(state, RSTV0910_P1_TSCFGH, state->tscfgh | 0x01);
        write_reg(state, RSTV0910_P2_TSCFGH, state->tscfgh | 0x01);
        write_reg(state, RSTV0910_P1_TSCFGH, state->tscfgh);
        write_reg(state, RSTV0910_P2_TSCFGH, state->tscfgh);

        write_reg(state, RSTV0910_P1_I2CRPT, state->i2crpt);
        write_reg(state, RSTV0910_P2_I2CRPT, state->i2crpt);

        write_reg(state, RSTV0910_P1_TSINSDELM, 0x17);
        write_reg(state, RSTV0910_P1_TSINSDELL, 0xff);

        write_reg(state, RSTV0910_P2_TSINSDELM, 0x17);
        write_reg(state, RSTV0910_P2_TSINSDELL, 0xff);

        init_diseqc(state);
        return 0;
}

static int gate_ctrl(struct dvb_frontend *fe, int enable)
{
        struct stv *state = fe->demodulator_priv;
        u8 i2crpt = state->i2crpt & ~0x86;

        /*
         * mutex_lock note: Concurrent I2C gate bus accesses must be
         * prevented (STV0910 = dual demod on a single IC with a single I2C
         * gate/bus, and two tuners attached), similar to most (if not all)
         * other I2C host interfaces/buses.
         *
         * enable=1 (open I2C gate) will grab the lock
         * enable=0 (close I2C gate) releases the lock
         */

        if (enable) {
                mutex_lock(&state->base->i2c_lock);
                i2crpt |= 0x80;
        } else {
                i2crpt |= 0x02;
        }

        if (write_reg(state, state->nr ? RSTV0910_P2_I2CRPT :
                      RSTV0910_P1_I2CRPT, i2crpt) < 0) {
                /* don't hold the I2C bus lock on failure */
                if (!WARN_ON(!mutex_is_locked(&state->base->i2c_lock)))
                        mutex_unlock(&state->base->i2c_lock);
                dev_err(&state->base->i2c->dev,
                        "%s() write_reg failure (enable=%d)\n",
                        __func__, enable);
                return -EIO;
        }

        state->i2crpt = i2crpt;

        if (!enable)
                if (!WARN_ON(!mutex_is_locked(&state->base->i2c_lock)))
                        mutex_unlock(&state->base->i2c_lock);
        return 0;
}

static void release(struct dvb_frontend *fe)
{
        struct stv *state = fe->demodulator_priv;

        state->base->count--;
        if (state->base->count == 0) {
                list_del(&state->base->stvlist);
                kfree(state->base);
        }
        kfree(state);
}

static int set_parameters(struct dvb_frontend *fe)
{
        int stat = 0;
        struct stv *state = fe->demodulator_priv;
        struct dtv_frontend_properties *p = &fe->dtv_property_cache;

        stop(state);
        if (fe->ops.tuner_ops.set_params)
                fe->ops.tuner_ops.set_params(fe);
        state->symbol_rate = p->symbol_rate;
        stat = start(state, p);
        return stat;
}

static int manage_matype_info(struct stv *state)
{
        if (!state->started)
                return -EINVAL;
        if (state->receive_mode == RCVMODE_DVBS2) {
                u8 bbheader[2];

                read_regs(state, RSTV0910_P2_MATSTR1 + state->regoff,
                          bbheader, 2);
                state->feroll_off =
                        (enum fe_stv0910_roll_off)(bbheader[0] & 0x03);
                state->is_vcm = (bbheader[0] & 0x10) == 0;
                state->is_standard_broadcast = (bbheader[0] & 0xFC) == 0xF0;
        } else if (state->receive_mode == RCVMODE_DVBS) {
                state->is_vcm = 0;
                state->is_standard_broadcast = 1;
                state->feroll_off = FE_SAT_35;
        }
        return 0;
}

static int read_snr(struct dvb_frontend *fe)
{
        struct stv *state = fe->demodulator_priv;
        struct dtv_frontend_properties *p = &fe->dtv_property_cache;
        s32 snrval;

        if (!get_signal_to_noise(state, &snrval)) {
                p->cnr.stat[0].scale = FE_SCALE_DECIBEL;
                p->cnr.stat[0].svalue = 100 * snrval; /* fix scale */
        } else {
                p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        }

        return 0;
}

static int read_ber(struct dvb_frontend *fe)
{
        struct stv *state = fe->demodulator_priv;
        struct dtv_frontend_properties *p = &fe->dtv_property_cache;
        u32 n, d;

        get_bit_error_rate(state, &n, &d);

        p->pre_bit_error.stat[0].scale = FE_SCALE_COUNTER;
        p->pre_bit_error.stat[0].uvalue = n;
        p->pre_bit_count.stat[0].scale = FE_SCALE_COUNTER;
        p->pre_bit_count.stat[0].uvalue = d;

        return 0;
}

static void read_signal_strength(struct dvb_frontend *fe)
{
        struct stv *state = fe->demodulator_priv;
        struct dtv_frontend_properties *p = &state->fe.dtv_property_cache;
        u8 reg[2];
        u16 agc;
        s32 padc, power = 0;
        int i;

        read_regs(state, RSTV0910_P2_AGCIQIN1 + state->regoff, reg, 2);

        agc = (((u32)reg[0]) << 8) | reg[1];

        for (i = 0; i < 5; i += 1) {
                read_regs(state, RSTV0910_P2_POWERI + state->regoff, reg, 2);
                power += (u32)reg[0] * (u32)reg[0]
                        + (u32)reg[1] * (u32)reg[1];
                usleep_range(3000, 4000);
        }
        power /= 5;

        padc = table_lookup(padc_lookup, ARRAY_SIZE(padc_lookup), power) + 352;

        p->strength.stat[0].scale = FE_SCALE_DECIBEL;
        p->strength.stat[0].svalue = (padc - agc);
}

static int read_status(struct dvb_frontend *fe, enum fe_status *status)
{
        struct stv *state = fe->demodulator_priv;
        struct dtv_frontend_properties *p = &fe->dtv_property_cache;
        u8 dmd_state = 0;
        u8 dstatus  = 0;
        enum receive_mode cur_receive_mode = RCVMODE_NONE;
        u32 feclock = 0;

        *status = 0;

        read_reg(state, RSTV0910_P2_DMDSTATE + state->regoff, &dmd_state);

        if (dmd_state & 0x40) {
                read_reg(state, RSTV0910_P2_DSTATUS + state->regoff, &dstatus);
                if (dstatus & 0x08)
                        cur_receive_mode = (dmd_state & 0x20) ?
                                RCVMODE_DVBS : RCVMODE_DVBS2;
        }
        if (cur_receive_mode == RCVMODE_NONE) {
                set_vth(state);

                /* reset signal statistics */
                p->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
                p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
                p->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
                p->pre_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;

                return 0;
        }

        *status |= (FE_HAS_SIGNAL
                | FE_HAS_CARRIER
                | FE_HAS_VITERBI
                | FE_HAS_SYNC);

        if (state->receive_mode == RCVMODE_NONE) {
                state->receive_mode = cur_receive_mode;
                state->demod_lock_time = jiffies;
                state->first_time_lock = 1;

                get_signal_parameters(state);
                tracking_optimization(state);

                write_reg(state, RSTV0910_P2_TSCFGH + state->regoff,
                          state->tscfgh);
                usleep_range(3000, 4000);
                write_reg(state, RSTV0910_P2_TSCFGH + state->regoff,
                          state->tscfgh | 0x01);
                write_reg(state, RSTV0910_P2_TSCFGH + state->regoff,
                          state->tscfgh);
        }
        if (dmd_state & 0x40) {
                if (state->receive_mode == RCVMODE_DVBS2) {
                        u8 pdelstatus;

                        read_reg(state,
                                 RSTV0910_P2_PDELSTATUS1 + state->regoff,
                                 &pdelstatus);
                        feclock = (pdelstatus & 0x02) != 0;
                } else {
                        u8 vstatus;

                        read_reg(state,
                                 RSTV0910_P2_VSTATUSVIT + state->regoff,
                                 &vstatus);
                        feclock = (vstatus & 0x08) != 0;
                }
        }

        if (feclock) {
                *status |= FE_HAS_LOCK;

                if (state->first_time_lock) {
                        u8 tmp;

                        state->first_time_lock = 0;

                        manage_matype_info(state);

                        if (state->receive_mode == RCVMODE_DVBS2) {
                                /*
                                 * FSTV0910_P2_MANUALSX_ROLLOFF,
                                 * FSTV0910_P2_MANUALS2_ROLLOFF = 0
                                 */
                                state->demod_bits &= ~0x84;
                                write_reg(state,
                                          RSTV0910_P2_DEMOD + state->regoff,
                                          state->demod_bits);
                                read_reg(state,
                                         RSTV0910_P2_PDELCTRL2 + state->regoff,
                                         &tmp);
                                /* reset DVBS2 packet delinator error counter */
                                tmp |= 0x40;
                                write_reg(state,
                                          RSTV0910_P2_PDELCTRL2 + state->regoff,
                                          tmp);
                                /* reset DVBS2 packet delinator error counter */
                                tmp &= ~0x40;
                                write_reg(state,
                                          RSTV0910_P2_PDELCTRL2 + state->regoff,
                                          tmp);

                                state->berscale = 2;
                                state->last_bernumerator = 0;
                                state->last_berdenominator = 1;
                                /* force to PRE BCH Rate */
                                write_reg(state,
                                          RSTV0910_P2_ERRCTRL1 + state->regoff,
                                          BER_SRC_S2 | state->berscale);
                        } else {
                                state->berscale = 2;
                                state->last_bernumerator = 0;
                                state->last_berdenominator = 1;
                                /* force to PRE RS Rate */
                                write_reg(state,
                                          RSTV0910_P2_ERRCTRL1 + state->regoff,
                                          BER_SRC_S | state->berscale);
                        }
                        /* Reset the Total packet counter */
                        write_reg(state,
                                  RSTV0910_P2_FBERCPT4 + state->regoff, 0x00);
                        /*
                         * Reset the packet Error counter2 (and Set it to
                         * infinite error count mode)
                         */
                        write_reg(state,
                                  RSTV0910_P2_ERRCTRL2 + state->regoff, 0xc1);

                        set_vth_default(state);
                        if (state->receive_mode == RCVMODE_DVBS)
                                enable_puncture_rate(state,
                                                     state->puncture_rate);
                }

                /* Use highest signaled ModCod for quality */
                if (state->is_vcm) {
                        u8 tmp;
                        enum fe_stv0910_mod_cod mod_cod;

                        read_reg(state, RSTV0910_P2_DMDMODCOD + state->regoff,
                                 &tmp);
                        mod_cod = (enum fe_stv0910_mod_cod)((tmp & 0x7c) >> 2);

                        if (mod_cod > state->mod_cod)
                                state->mod_cod = mod_cod;
                }
        }

        /* read signal statistics */

        /* read signal strength */
        read_signal_strength(fe);

        /* read carrier/noise on FE_HAS_CARRIER */
        if (*status & FE_HAS_CARRIER)
                read_snr(fe);
        else
                p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;

        /* read ber */
        if (*status & FE_HAS_VITERBI) {
                read_ber(fe);
        } else {
                p->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
                p->pre_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        }

        return 0;
}

static int get_frontend(struct dvb_frontend *fe,
                        struct dtv_frontend_properties *p)
{
        struct stv *state = fe->demodulator_priv;
        u8 tmp;
        u32 symbolrate;

        if (state->receive_mode == RCVMODE_DVBS2) {
                u32 mc;
                const enum fe_modulation modcod2mod[0x20] = {
                        QPSK, QPSK, QPSK, QPSK,
                        QPSK, QPSK, QPSK, QPSK,
                        QPSK, QPSK, QPSK, QPSK,
                        PSK_8, PSK_8, PSK_8, PSK_8,
                        PSK_8, PSK_8, APSK_16, APSK_16,
                        APSK_16, APSK_16, APSK_16, APSK_16,
                        APSK_32, APSK_32, APSK_32, APSK_32,
                        APSK_32,
                };
                const enum fe_code_rate modcod2fec[0x20] = {
                        FEC_NONE, FEC_NONE, FEC_NONE, FEC_2_5,
                        FEC_1_2, FEC_3_5, FEC_2_3, FEC_3_4,
                        FEC_4_5, FEC_5_6, FEC_8_9, FEC_9_10,
                        FEC_3_5, FEC_2_3, FEC_3_4, FEC_5_6,
                        FEC_8_9, FEC_9_10, FEC_2_3, FEC_3_4,
                        FEC_4_5, FEC_5_6, FEC_8_9, FEC_9_10,
                        FEC_3_4, FEC_4_5, FEC_5_6, FEC_8_9,
                        FEC_9_10
                };
                read_reg(state, RSTV0910_P2_DMDMODCOD + state->regoff, &tmp);
                mc = ((tmp & 0x7c) >> 2);
                p->pilot = (tmp & 0x01) ? PILOT_ON : PILOT_OFF;
                p->modulation = modcod2mod[mc];
                p->fec_inner = modcod2fec[mc];
        } else if (state->receive_mode == RCVMODE_DVBS) {
                read_reg(state, RSTV0910_P2_VITCURPUN + state->regoff, &tmp);
                switch (tmp & 0x1F) {
                case 0x0d:
                        p->fec_inner = FEC_1_2;
                        break;
                case 0x12:
                        p->fec_inner = FEC_2_3;
                        break;
                case 0x15:
                        p->fec_inner = FEC_3_4;
                        break;
                case 0x18:
                        p->fec_inner = FEC_5_6;
                        break;
                case 0x1a:
                        p->fec_inner = FEC_7_8;
                        break;
                default:
                        p->fec_inner = FEC_NONE;
                        break;
                }
                p->rolloff = ROLLOFF_35;
        }

        if (state->receive_mode != RCVMODE_NONE) {
                get_cur_symbol_rate(state, &symbolrate);
                p->symbol_rate = symbolrate;
        }
        return 0;
}

static int tune(struct dvb_frontend *fe, bool re_tune,
                unsigned int mode_flags,
                unsigned int *delay, enum fe_status *status)
{
        struct stv *state = fe->demodulator_priv;
        int r;

        if (re_tune) {
                r = set_parameters(fe);
                if (r)
                        return r;
                state->tune_time = jiffies;
        }

        r = read_status(fe, status);
        if (r)
                return r;

        if (*status & FE_HAS_LOCK)
                return 0;
        *delay = HZ;

        return 0;
}

static enum dvbfe_algo get_algo(struct dvb_frontend *fe)
{
        return DVBFE_ALGO_HW;
}

static int set_tone(struct dvb_frontend *fe, enum fe_sec_tone_mode tone)
{
        struct stv *state = fe->demodulator_priv;
        u16 offs = state->nr ? 0x40 : 0;

        switch (tone) {
        case SEC_TONE_ON:
                return write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0x38);
        case SEC_TONE_OFF:
                return write_reg(state, RSTV0910_P1_DISTXCFG + offs, 0x3a);
        default:
                break;
        }
        return -EINVAL;
}

static int wait_dis(struct stv *state, u8 flag, u8 val)
{
        int i;
        u8 stat;
        u16 offs = state->nr ? 0x40 : 0;

        for (i = 0; i < 10; i++) {
                read_reg(state, RSTV0910_P1_DISTXSTATUS + offs, &stat);
                if ((stat & flag) == val)
                        return 0;
                usleep_range(10000, 11000);
        }
        return -ETIMEDOUT;
}

static int send_master_cmd(struct dvb_frontend *fe,
                           struct dvb_diseqc_master_cmd *cmd)
{
        struct stv *state = fe->demodulator_priv;
        int i;

        SET_FIELD(DISEQC_MODE, 2);
        SET_FIELD(DIS_PRECHARGE, 1);
        for (i = 0; i < cmd->msg_len; i++) {
                wait_dis(state, 0x40, 0x00);
                SET_REG(DISTXFIFO, cmd->msg[i]);
        }
        SET_FIELD(DIS_PRECHARGE, 0);
        wait_dis(state, 0x20, 0x20);
        return 0;
}

static int send_burst(struct dvb_frontend *fe, enum fe_sec_mini_cmd burst)
{
        struct stv *state = fe->demodulator_priv;
        u8 value;

        if (burst == SEC_MINI_A) {
                SET_FIELD(DISEQC_MODE, 3);
                value = 0x00;
        } else {
                SET_FIELD(DISEQC_MODE, 2);
                value = 0xFF;
        }

        SET_FIELD(DIS_PRECHARGE, 1);
        wait_dis(state, 0x40, 0x00);
        SET_REG(DISTXFIFO, value);
        SET_FIELD(DIS_PRECHARGE, 0);
        wait_dis(state, 0x20, 0x20);

        return 0;
}

static int sleep(struct dvb_frontend *fe)
{
        struct stv *state = fe->demodulator_priv;

        stop(state);
        return 0;
}

static const struct dvb_frontend_ops stv0910_ops = {
        .delsys = { SYS_DVBS, SYS_DVBS2, SYS_DSS },
        .info = {
                .name                   = "ST STV0910",
                .frequency_min_hz       =  950 * MHz,
                .frequency_max_hz       = 2150 * MHz,
                .symbol_rate_min        = 100000,
                .symbol_rate_max        = 70000000,
                .caps                   = FE_CAN_INVERSION_AUTO |
                                          FE_CAN_FEC_AUTO       |
                                          FE_CAN_QPSK           |
                                          FE_CAN_2G_MODULATION  |
                                          FE_CAN_MULTISTREAM
        },
        .sleep                          = sleep,
        .release                        = release,
        .i2c_gate_ctrl                  = gate_ctrl,
        .set_frontend                   = set_parameters,
        .get_frontend_algo              = get_algo,
        .get_frontend                   = get_frontend,
        .tune                           = tune,
        .read_status                    = read_status,
        .set_tone                       = set_tone,

        .diseqc_send_master_cmd         = send_master_cmd,
        .diseqc_send_burst              = send_burst,
};

static struct stv_base *match_base(struct i2c_adapter *i2c, u8 adr)
{
        struct stv_base *p;

        list_for_each_entry(p, &stvlist, stvlist)
                if (p->i2c == i2c && p->adr == adr)
                        return p;
        return NULL;
}

static void stv0910_init_stats(struct stv *state)
{
        struct dtv_frontend_properties *p = &state->fe.dtv_property_cache;

        p->strength.len = 1;
        p->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        p->cnr.len = 1;
        p->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        p->pre_bit_error.len = 1;
        p->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
        p->pre_bit_count.len = 1;
        p->pre_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
}

struct dvb_frontend *stv0910_attach(struct i2c_adapter *i2c,
                                    struct stv0910_cfg *cfg,
                                    int nr)
{
        struct stv *state;
        struct stv_base *base;

        state = kzalloc(sizeof(*state), GFP_KERNEL);
        if (!state)
                return NULL;

        state->tscfgh = 0x20 | (cfg->parallel ? 0 : 0x40);
        state->tsgeneral = (cfg->parallel == 2) ? 0x02 : 0x00;
        state->i2crpt = 0x0A | ((cfg->rptlvl & 0x07) << 4);
        /* use safe tsspeed value if unspecified through stv0910_cfg */
        state->tsspeed = (cfg->tsspeed ? cfg->tsspeed : 0x28);
        state->nr = nr;
        state->regoff = state->nr ? 0 : 0x200;
        state->search_range = 16000000;
        state->demod_bits = 0x10; /* Inversion : Auto with reset to 0 */
        state->receive_mode = RCVMODE_NONE;
        state->cur_scrambling_code = (~0U);
        state->single = cfg->single ? 1 : 0;

        base = match_base(i2c, cfg->adr);
        if (base) {
                base->count++;
                state->base = base;
        } else {
                base = kzalloc(sizeof(*base), GFP_KERNEL);
                if (!base)
                        goto fail;
                base->i2c = i2c;
                base->adr = cfg->adr;
                base->count = 1;
                base->extclk = cfg->clk ? cfg->clk : 30000000;

                mutex_init(&base->i2c_lock);
                mutex_init(&base->reg_lock);
                state->base = base;
                if (probe(state) < 0) {
                        dev_info(&i2c->dev, "No demod found at adr %02X on %s\n",
                                 cfg->adr, dev_name(&i2c->dev));
                        kfree(base);
                        goto fail;
                }
                list_add(&base->stvlist, &stvlist);
        }
        state->fe.ops = stv0910_ops;
        state->fe.demodulator_priv = state;
        state->nr = nr;

        dev_info(&i2c->dev, "%s demod found at adr %02X on %s\n",
                 state->fe.ops.info.name, cfg->adr, dev_name(&i2c->dev));

        stv0910_init_stats(state);

        return &state->fe;

fail:
        kfree(state);
        return NULL;
}
EXPORT_SYMBOL_GPL(stv0910_attach);

MODULE_DESCRIPTION("ST STV0910 multistandard frontend driver");
MODULE_AUTHOR("Ralph and Marcus Metzler, Manfred Voelkel");
MODULE_LICENSE("GPL v2");