va1j5jf8007t.c

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/*
 * ISDB-T driver for VA1J5JF8007/VA1J5JF8011
 *
 * Copyright (C) 2009 HIRANO Takahito <[email protected]>
 *
 * based on pt1dvr - http://pt1dvr.sourceforge.jp/
 *  by Tomoaki Ishikawa <[email protected]>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include "dvb_frontend.h"
#include "dvb_math.h"
#include "va1j5jf8007t.h"

enum va1j5jf8007t_tune_state {
    VA1J5JF8007T_IDLE,
    VA1J5JF8007T_SET_FREQUENCY,
    VA1J5JF8007T_CHECK_FREQUENCY,
    VA1J5JF8007T_SET_MODULATION,
    VA1J5JF8007T_CHECK_MODULATION,
    VA1J5JF8007T_TRACK,
    VA1J5JF8007T_ABORT,
};

struct va1j5jf8007t_state {
    const struct va1j5jf8007t_config *config;
    struct i2c_adapter *adap;
    struct dvb_frontend fe;
    enum va1j5jf8007t_tune_state tune_state;
};

static int va1j5jf8007t_read_snr(struct dvb_frontend *fe, u16 *snr)
{
    struct va1j5jf8007t_state *state;
    u8 addr;
    int i;
    u8 write_buf[1], read_buf[1];
    struct i2c_msg msgs[2];
    s32 word, x, y;

    state = fe->demodulator_priv;
    addr = state->config->demod_address;

    word = 0;
    for (i = 0; i < 3; i++) {
        write_buf[0] = 0x8b + i;

        msgs[0].addr = addr;
        msgs[0].flags = 0;
        msgs[0].len = sizeof(write_buf);
        msgs[0].buf = write_buf;

        msgs[1].addr = addr;
        msgs[1].flags = I2C_M_RD;
        msgs[1].len = sizeof(read_buf);
        msgs[1].buf = read_buf;

        if (i2c_transfer(state->adap, msgs, 2) != 2)
            return -EREMOTEIO;

        word <<= 8;
        word |= read_buf[0];
    }

    if (!word)
        return -EIO;

    x = 10 * (intlog10(0x540000 * 100 / word) - (2 << 24));
    y = (24ll << 46) / 1000000;
    y = ((s64)y * x >> 30) - (16ll << 40) / 10000;
    y = ((s64)y * x >> 29) + (398ll << 35) / 10000;
    y = ((s64)y * x >> 30) + (5491ll << 29) / 10000;
    y = ((s64)y * x >> 30) + (30965ll << 23) / 10000;
    *snr = y >> 15;
    return 0;
}

static int va1j5jf8007t_get_frontend_algo(struct dvb_frontend *fe)
{
    return DVBFE_ALGO_HW;
}

static int
va1j5jf8007t_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
    struct va1j5jf8007t_state *state;

    state = fe->demodulator_priv;

    switch (state->tune_state) {
    case VA1J5JF8007T_IDLE:
    case VA1J5JF8007T_SET_FREQUENCY:
    case VA1J5JF8007T_CHECK_FREQUENCY:
        *status = 0;
        return 0;


    case VA1J5JF8007T_SET_MODULATION:
    case VA1J5JF8007T_CHECK_MODULATION:
    case VA1J5JF8007T_ABORT:
        *status |= FE_HAS_SIGNAL;
        return 0;

    case VA1J5JF8007T_TRACK:
        *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
        return 0;
    }

    BUG();
}

struct va1j5jf8007t_cb_map {
    u32 frequency;
    u8 cb;
};

static const struct va1j5jf8007t_cb_map va1j5jf8007t_cb_maps[] = {
    {  90000000, 0x80 },
    { 140000000, 0x81 },
    { 170000000, 0xa1 },
    { 220000000, 0x62 },
    { 330000000, 0xa2 },
    { 402000000, 0xe2 },
    { 450000000, 0x64 },
    { 550000000, 0x84 },
    { 600000000, 0xa4 },
    { 700000000, 0xc4 },
};

static u8 va1j5jf8007t_lookup_cb(u32 frequency)
{
    int i;
    const struct va1j5jf8007t_cb_map *map;

    for (i = 0; i < ARRAY_SIZE(va1j5jf8007t_cb_maps); i++) {
        map = &va1j5jf8007t_cb_maps[i];
        if (frequency < map->frequency)
            return map->cb;
    }
    return 0xe4;
}

static int va1j5jf8007t_set_frequency(struct va1j5jf8007t_state *state)
{
    u32 frequency;
    u16 word;
    u8 buf[6];
    struct i2c_msg msg;

    frequency = state->fe.dtv_property_cache.frequency;

    word = (frequency + 71428) / 142857 + 399;
    buf[0] = 0xfe;
    buf[1] = 0xc2;
    buf[2] = word >> 8;
    buf[3] = word;
    buf[4] = 0x80;
    buf[5] = va1j5jf8007t_lookup_cb(frequency);

    msg.addr = state->config->demod_address;
    msg.flags = 0;
    msg.len = sizeof(buf);
    msg.buf = buf;

    if (i2c_transfer(state->adap, &msg, 1) != 1)
        return -EREMOTEIO;

    return 0;
}

static int
va1j5jf8007t_check_frequency(struct va1j5jf8007t_state *state, int *lock)
{
    u8 addr;
    u8 write_buf[2], read_buf[1];
    struct i2c_msg msgs[2];

    addr = state->config->demod_address;

    write_buf[0] = 0xfe;
    write_buf[1] = 0xc3;

    msgs[0].addr = addr;
    msgs[0].flags = 0;
    msgs[0].len = sizeof(write_buf);
    msgs[0].buf = write_buf;

    msgs[1].addr = addr;
    msgs[1].flags = I2C_M_RD;
    msgs[1].len = sizeof(read_buf);
    msgs[1].buf = read_buf;

    if (i2c_transfer(state->adap, msgs, 2) != 2)
        return -EREMOTEIO;

    *lock = read_buf[0] & 0x40;
    return 0;
}

static int va1j5jf8007t_set_modulation(struct va1j5jf8007t_state *state)
{
    u8 buf[2];
    struct i2c_msg msg;

    buf[0] = 0x01;
    buf[1] = 0x40;

    msg.addr = state->config->demod_address;
    msg.flags = 0;
    msg.len = sizeof(buf);
    msg.buf = buf;

    if (i2c_transfer(state->adap, &msg, 1) != 1)
        return -EREMOTEIO;

    return 0;
}

static int va1j5jf8007t_check_modulation(struct va1j5jf8007t_state *state,
                     int *lock, int *retry)
{
    u8 addr;
    u8 write_buf[1], read_buf[1];
    struct i2c_msg msgs[2];

    addr = state->config->demod_address;

    write_buf[0] = 0x80;

    msgs[0].addr = addr;
    msgs[0].flags = 0;
    msgs[0].len = sizeof(write_buf);
    msgs[0].buf = write_buf;

    msgs[1].addr = addr;
    msgs[1].flags = I2C_M_RD;
    msgs[1].len = sizeof(read_buf);
    msgs[1].buf = read_buf;

    if (i2c_transfer(state->adap, msgs, 2) != 2)
        return -EREMOTEIO;

    *lock = !(read_buf[0] & 0x10);
    *retry = read_buf[0] & 0x80;
    return 0;
}

static int
va1j5jf8007t_tune(struct dvb_frontend *fe,
          bool re_tune,
          unsigned int mode_flags,  unsigned int *delay,
          fe_status_t *status)
{
    struct va1j5jf8007t_state *state;
    int ret;
    int lock = 0, retry = 0;

    state = fe->demodulator_priv;

    if (re_tune)
        state->tune_state = VA1J5JF8007T_SET_FREQUENCY;

    switch (state->tune_state) {
    case VA1J5JF8007T_IDLE:
        *delay = 3 * HZ;
        *status = 0;
        return 0;

    case VA1J5JF8007T_SET_FREQUENCY:
        ret = va1j5jf8007t_set_frequency(state);
        if (ret < 0)
            return ret;

        state->tune_state = VA1J5JF8007T_CHECK_FREQUENCY;
        *delay = 0;
        *status = 0;
        return 0;

    case VA1J5JF8007T_CHECK_FREQUENCY:
        ret = va1j5jf8007t_check_frequency(state, &lock);
        if (ret < 0)
            return ret;

        if (!lock)  {
            *delay = (HZ + 999) / 1000;
            *status = 0;
            return 0;
        }

        state->tune_state = VA1J5JF8007T_SET_MODULATION;
        *delay = 0;
        *status = FE_HAS_SIGNAL;
        return 0;

    case VA1J5JF8007T_SET_MODULATION:
        ret = va1j5jf8007t_set_modulation(state);
        if (ret < 0)
            return ret;

        state->tune_state = VA1J5JF8007T_CHECK_MODULATION;
        *delay = 0;
        *status = FE_HAS_SIGNAL;
        return 0;

    case VA1J5JF8007T_CHECK_MODULATION:
        ret = va1j5jf8007t_check_modulation(state, &lock, &retry);
        if (ret < 0)
            return ret;

        if (!lock)  {
            if (!retry)  {
                state->tune_state = VA1J5JF8007T_ABORT;
                *delay = 3 * HZ;
                *status = FE_HAS_SIGNAL;
                return 0;
            }
            *delay = (HZ + 999) / 1000;
            *status = FE_HAS_SIGNAL;
            return 0;
        }

        state->tune_state = VA1J5JF8007T_TRACK;
        /* fall through */

    case VA1J5JF8007T_TRACK:
        *delay = 3 * HZ;
        *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
        return 0;

    case VA1J5JF8007T_ABORT:
        *delay = 3 * HZ;
        *status = FE_HAS_SIGNAL;
        return 0;
    }

    BUG();
}

static int va1j5jf8007t_init_frequency(struct va1j5jf8007t_state *state)
{
    u8 buf[7];
    struct i2c_msg msg;

    buf[0] = 0xfe;
    buf[1] = 0xc2;
    buf[2] = 0x01;
    buf[3] = 0x8f;
    buf[4] = 0xc1;
    buf[5] = 0x80;
    buf[6] = 0x80;

    msg.addr = state->config->demod_address;
    msg.flags = 0;
    msg.len = sizeof(buf);
    msg.buf = buf;

    if (i2c_transfer(state->adap, &msg, 1) != 1)
        return -EREMOTEIO;

    return 0;
}

static int va1j5jf8007t_set_sleep(struct va1j5jf8007t_state *state, int sleep)
{
    u8 buf[2];
    struct i2c_msg msg;

    buf[0] = 0x03;
    buf[1] = sleep ? 0x90 : 0x80;

    msg.addr = state->config->demod_address;
    msg.flags = 0;
    msg.len = sizeof(buf);
    msg.buf = buf;

    if (i2c_transfer(state->adap, &msg, 1) != 1)
        return -EREMOTEIO;

    return 0;
}

static int va1j5jf8007t_sleep(struct dvb_frontend *fe)
{
    struct va1j5jf8007t_state *state;
    int ret;

    state = fe->demodulator_priv;

    ret = va1j5jf8007t_init_frequency(state);
    if (ret < 0)
        return ret;

    return va1j5jf8007t_set_sleep(state, 1);
}

static int va1j5jf8007t_init(struct dvb_frontend *fe)
{
    struct va1j5jf8007t_state *state;

    state = fe->demodulator_priv;
    state->tune_state = VA1J5JF8007T_IDLE;

    return va1j5jf8007t_set_sleep(state, 0);
}

static void va1j5jf8007t_release(struct dvb_frontend *fe)
{
    struct va1j5jf8007t_state *state;
    state = fe->demodulator_priv;
    kfree(state);
}

static struct dvb_frontend_ops va1j5jf8007t_ops = {
    .delsys = { SYS_ISDBT },
    .info = {
        .name = "VA1J5JF8007/VA1J5JF8011 ISDB-T",
        .frequency_min = 90000000,
        .frequency_max = 770000000,
        .frequency_stepsize = 142857,
        .caps = FE_CAN_INVERSION_AUTO | FE_CAN_FEC_AUTO |
            FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
            FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_HIERARCHY_AUTO,
    },

    .read_snr = va1j5jf8007t_read_snr,
    .get_frontend_algo = va1j5jf8007t_get_frontend_algo,
    .read_status = va1j5jf8007t_read_status,
    .tune = va1j5jf8007t_tune,
    .sleep = va1j5jf8007t_sleep,
    .init = va1j5jf8007t_init,
    .release = va1j5jf8007t_release,
};

static const u8 va1j5jf8007t_20mhz_prepare_bufs[][2] = {
    {0x03, 0x90}, {0x14, 0x8f}, {0x1c, 0x2a}, {0x1d, 0xa8}, {0x1e, 0xa2},
    {0x22, 0x83}, {0x31, 0x0d}, {0x32, 0xe0}, {0x39, 0xd3}, {0x3a, 0x00},
    {0x5c, 0x40}, {0x5f, 0x80}, {0x75, 0x02}, {0x76, 0x4e}, {0x77, 0x03},
    {0xef, 0x01}
};

static const u8 va1j5jf8007t_25mhz_prepare_bufs[][2] = {
    {0x03, 0x90}, {0x1c, 0x2a}, {0x1d, 0xa8}, {0x1e, 0xa2}, {0x22, 0x83},
    {0x3a, 0x00}, {0x5c, 0x40}, {0x5f, 0x80}, {0x75, 0x0a}, {0x76, 0x4c},
    {0x77, 0x03}, {0xef, 0x01}
};

int va1j5jf8007t_prepare(struct dvb_frontend *fe)
{
    struct va1j5jf8007t_state *state;
    const u8 (*bufs)[2];
    int size;
    u8 buf[2];
    struct i2c_msg msg;
    int i;

    state = fe->demodulator_priv;

    switch (state->config->frequency) {
    case VA1J5JF8007T_20MHZ:
        bufs = va1j5jf8007t_20mhz_prepare_bufs;
        size = ARRAY_SIZE(va1j5jf8007t_20mhz_prepare_bufs);
        break;
    case VA1J5JF8007T_25MHZ:
        bufs = va1j5jf8007t_25mhz_prepare_bufs;
        size = ARRAY_SIZE(va1j5jf8007t_25mhz_prepare_bufs);
        break;
    default:
        return -EINVAL;
    }

    msg.addr = state->config->demod_address;
    msg.flags = 0;
    msg.len = sizeof(buf);
    msg.buf = buf;

    for (i = 0; i < size; i++) {
        memcpy(buf, bufs[i], sizeof(buf));
        if (i2c_transfer(state->adap, &msg, 1) != 1)
            return -EREMOTEIO;
    }

    return va1j5jf8007t_init_frequency(state);
}

struct dvb_frontend *
va1j5jf8007t_attach(const struct va1j5jf8007t_config *config,
            struct i2c_adapter *adap)
{
    struct va1j5jf8007t_state *state;
    struct dvb_frontend *fe;
    u8 buf[2];
    struct i2c_msg msg;

    state = kzalloc(sizeof(struct va1j5jf8007t_state), GFP_KERNEL);
    if (!state)
        return NULL;

    state->config = config;
    state->adap = adap;

    fe = &state->fe;
    memcpy(&fe->ops, &va1j5jf8007t_ops, sizeof(struct dvb_frontend_ops));
    fe->demodulator_priv = state;

    buf[0] = 0x01;
    buf[1] = 0x80;

    msg.addr = state->config->demod_address;
    msg.flags = 0;
    msg.len = sizeof(buf);
    msg.buf = buf;

    if (i2c_transfer(state->adap, &msg, 1) != 1) {
        kfree(state);
        return NULL;
    }

    return fe;
}