dib0070.c

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/*
 * Linux-DVB Driver for DiBcom's DiB0070 base-band RF Tuner.
 *
 * Copyright (C) 2005-9 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; 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.
 *
 *
 * This code is more or less generated from another driver, please
 * excuse some codingstyle oddities.
 *
 */

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

#include "dvb_frontend.h"

#include "dib0070.h"
#include "dibx000_common.h"

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

#define dprintk(args...) do { \
    if (debug) { \
        printk(KERN_DEBUG "DiB0070: "); \
        printk(args); \
        printk("\n"); \
    } \
} while (0)

#define DIB0070_P1D  0x00
#define DIB0070_P1F  0x01
#define DIB0070_P1G  0x03
#define DIB0070S_P1A 0x02

struct dib0070_state {
    struct i2c_adapter *i2c;
    struct dvb_frontend *fe;
    const struct dib0070_config *cfg;
    u16 wbd_ff_offset;
    u8 revision;

    enum frontend_tune_state tune_state;
    u32 current_rf;

    /* for the captrim binary search */
    s8 step;
    u16 adc_diff;

    s8 captrim;
    s8 fcaptrim;
    u16 lo4;

    const struct dib0070_tuning *current_tune_table_index;
    const struct dib0070_lna_match *lna_match;

    u8  wbd_gain_current;
    u16 wbd_offset_3_3[2];

    /* for the I2C transfer */
    struct i2c_msg msg[2];
    u8 i2c_write_buffer[3];
    u8 i2c_read_buffer[2];
    struct mutex i2c_buffer_lock;
};

static u16 dib0070_read_reg(struct dib0070_state *state, u8 reg)
{
    u16 ret;

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

    state->i2c_write_buffer[0] = reg;

    memset(state->msg, 0, 2 * sizeof(struct i2c_msg));
    state->msg[0].addr = state->cfg->i2c_address;
    state->msg[0].flags = 0;
    state->msg[0].buf = state->i2c_write_buffer;
    state->msg[0].len = 1;
    state->msg[1].addr = state->cfg->i2c_address;
    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, state->msg, 2) != 2) {
        printk(KERN_WARNING "DiB0070 I2C read failed\n");
        ret = 0;
    } else
        ret = (state->i2c_read_buffer[0] << 8)
            | state->i2c_read_buffer[1];

    mutex_unlock(&state->i2c_buffer_lock);
    return ret;
}

static int dib0070_write_reg(struct dib0070_state *state, u8 reg, u16 val)
{
    int ret;

    if (mutex_lock_interruptible(&state->i2c_buffer_lock) < 0) {
        dprintk("could not acquire lock");
        return -EINVAL;
    }
    state->i2c_write_buffer[0] = reg;
    state->i2c_write_buffer[1] = val >> 8;
    state->i2c_write_buffer[2] = val & 0xff;

    memset(state->msg, 0, sizeof(struct i2c_msg));
    state->msg[0].addr = state->cfg->i2c_address;
    state->msg[0].flags = 0;
    state->msg[0].buf = state->i2c_write_buffer;
    state->msg[0].len = 3;

    if (i2c_transfer(state->i2c, state->msg, 1) != 1) {
        printk(KERN_WARNING "DiB0070 I2C write failed\n");
        ret = -EREMOTEIO;
    } else
        ret = 0;

    mutex_unlock(&state->i2c_buffer_lock);
    return ret;
}

#define HARD_RESET(state) do { \
    state->cfg->sleep(state->fe, 0); \
    if (state->cfg->reset) { \
    state->cfg->reset(state->fe,1); msleep(10); \
    state->cfg->reset(state->fe,0); msleep(10); \
    } \
} while (0)

static int dib0070_set_bandwidth(struct dvb_frontend *fe)
{
    struct dib0070_state *state = fe->tuner_priv;
    u16 tmp = dib0070_read_reg(state, 0x02) & 0x3fff;

    if (state->fe->dtv_property_cache.bandwidth_hz/1000 > 7000)
    tmp |= (0 << 14);
    else if (state->fe->dtv_property_cache.bandwidth_hz/1000 > 6000)
    tmp |= (1 << 14);
    else if (state->fe->dtv_property_cache.bandwidth_hz/1000 > 5000)
    tmp |= (2 << 14);
    else
    tmp |= (3 << 14);

    dib0070_write_reg(state, 0x02, tmp);

    /* sharpen the BB filter in ISDB-T to have higher immunity to adjacent channels */
    if (state->fe->dtv_property_cache.delivery_system == SYS_ISDBT) {
    u16 value = dib0070_read_reg(state, 0x17);

    dib0070_write_reg(state, 0x17, value & 0xfffc);
    tmp = dib0070_read_reg(state, 0x01) & 0x01ff;
    dib0070_write_reg(state, 0x01, tmp | (60 << 9));

    dib0070_write_reg(state, 0x17, value);
    }
    return 0;
}

static int dib0070_captrim(struct dib0070_state *state, enum frontend_tune_state *tune_state)
{
    int8_t step_sign;
    u16 adc;
    int ret = 0;

    if (*tune_state == CT_TUNER_STEP_0) {

        dib0070_write_reg(state, 0x0f, 0xed10);
        dib0070_write_reg(state, 0x17,    0x0034);

        dib0070_write_reg(state, 0x18, 0x0032);
        state->step = state->captrim = state->fcaptrim = 64;
        state->adc_diff = 3000;
        ret = 20;

    *tune_state = CT_TUNER_STEP_1;
    } else if (*tune_state == CT_TUNER_STEP_1) {
        state->step /= 2;
        dib0070_write_reg(state, 0x14, state->lo4 | state->captrim);
        ret = 15;

        *tune_state = CT_TUNER_STEP_2;
    } else if (*tune_state == CT_TUNER_STEP_2) {

        adc = dib0070_read_reg(state, 0x19);

        dprintk("CAPTRIM=%hd; ADC = %hd (ADC) & %dmV", state->captrim, adc, (u32) adc*(u32)1800/(u32)1024);

        if (adc >= 400) {
            adc -= 400;
            step_sign = -1;
        } else {
            adc = 400 - adc;
            step_sign = 1;
        }

        if (adc < state->adc_diff) {
            dprintk("CAPTRIM=%hd is closer to target (%hd/%hd)", state->captrim, adc, state->adc_diff);
            state->adc_diff = adc;
            state->fcaptrim = state->captrim;



        }
        state->captrim += (step_sign * state->step);

        if (state->step >= 1)
            *tune_state = CT_TUNER_STEP_1;
        else
            *tune_state = CT_TUNER_STEP_3;

    } else if (*tune_state == CT_TUNER_STEP_3) {
        dib0070_write_reg(state, 0x14, state->lo4 | state->fcaptrim);
        dib0070_write_reg(state, 0x18, 0x07ff);
        *tune_state = CT_TUNER_STEP_4;
    }

    return ret;
}

static int dib0070_set_ctrl_lo5(struct dvb_frontend *fe, u8 vco_bias_trim, u8 hf_div_trim, u8 cp_current, u8 third_order_filt)
{
    struct dib0070_state *state = fe->tuner_priv;
    u16 lo5 = (third_order_filt << 14) | (0 << 13) | (1 << 12) | (3 << 9) | (cp_current << 6) | (hf_div_trim << 3) | (vco_bias_trim << 0);
    dprintk("CTRL_LO5: 0x%x", lo5);
    return dib0070_write_reg(state, 0x15, lo5);
}

void dib0070_ctrl_agc_filter(struct dvb_frontend *fe, u8 open)
{
    struct dib0070_state *state = fe->tuner_priv;

    if (open) {
        dib0070_write_reg(state, 0x1b, 0xff00);
        dib0070_write_reg(state, 0x1a, 0x0000);
    } else {
        dib0070_write_reg(state, 0x1b, 0x4112);
    if (state->cfg->vga_filter != 0) {
        dib0070_write_reg(state, 0x1a, state->cfg->vga_filter);
        dprintk("vga filter register is set to %x", state->cfg->vga_filter);
    } else
        dib0070_write_reg(state, 0x1a, 0x0009);
    }
}

EXPORT_SYMBOL(dib0070_ctrl_agc_filter);
struct dib0070_tuning {
    u32 max_freq; /* for every frequency less than or equal to that field: this information is correct */
    u8 switch_trim;
    u8 vco_band;
    u8 hfdiv;
    u8 vco_multi;
    u8 presc;
    u8 wbdmux;
    u16 tuner_enable;
};

struct dib0070_lna_match {
    u32 max_freq; /* for every frequency less than or equal to that field: this information is correct */
    u8 lna_band;
};

static const struct dib0070_tuning dib0070s_tuning_table[] = {
    {     570000, 2, 1, 3, 6, 6, 2, 0x4000 | 0x0800 }, /* UHF */
    {     700000, 2, 0, 2, 4, 2, 2, 0x4000 | 0x0800 },
    {     863999, 2, 1, 2, 4, 2, 2, 0x4000 | 0x0800 },
    {    1500000, 0, 1, 1, 2, 2, 4, 0x2000 | 0x0400 }, /* LBAND */
    {    1600000, 0, 1, 1, 2, 2, 4, 0x2000 | 0x0400 },
    {    2000000, 0, 1, 1, 2, 2, 4, 0x2000 | 0x0400 },
    { 0xffffffff, 0, 0, 8, 1, 2, 1, 0x8000 | 0x1000 }, /* SBAND */
};

static const struct dib0070_tuning dib0070_tuning_table[] = {
    {     115000, 1, 0, 7, 24, 2, 1, 0x8000 | 0x1000 }, /* FM below 92MHz cannot be tuned */
    {     179500, 1, 0, 3, 16, 2, 1, 0x8000 | 0x1000 }, /* VHF */
    {     189999, 1, 1, 3, 16, 2, 1, 0x8000 | 0x1000 },
    {     250000, 1, 0, 6, 12, 2, 1, 0x8000 | 0x1000 },
    {     569999, 2, 1, 5,  6, 2, 2, 0x4000 | 0x0800 }, /* UHF */
    {     699999, 2, 0, 1,  4, 2, 2, 0x4000 | 0x0800 },
    {     863999, 2, 1, 1,  4, 2, 2, 0x4000 | 0x0800 },
    { 0xffffffff, 0, 1, 0,  2, 2, 4, 0x2000 | 0x0400 }, /* LBAND or everything higher than UHF */
};

static const struct dib0070_lna_match dib0070_lna_flip_chip[] = {
    {     180000, 0 }, /* VHF */
    {     188000, 1 },
    {     196400, 2 },
    {     250000, 3 },
    {     550000, 0 }, /* UHF */
    {     590000, 1 },
    {     666000, 3 },
    {     864000, 5 },
    {    1500000, 0 }, /* LBAND or everything higher than UHF */
    {    1600000, 1 },
    {    2000000, 3 },
    { 0xffffffff, 7 },
};

static const struct dib0070_lna_match dib0070_lna[] = {
    {     180000, 0 }, /* VHF */
    {     188000, 1 },
    {     196400, 2 },
    {     250000, 3 },
    {     550000, 2 }, /* UHF */
    {     650000, 3 },
    {     750000, 5 },
    {     850000, 6 },
    {     864000, 7 },
    {    1500000, 0 }, /* LBAND or everything higher than UHF */
    {    1600000, 1 },
    {    2000000, 3 },
    { 0xffffffff, 7 },
};

#define LPF 100
static int dib0070_tune_digital(struct dvb_frontend *fe)
{
    struct dib0070_state *state = fe->tuner_priv;

    const struct dib0070_tuning *tune;
    const struct dib0070_lna_match *lna_match;

    enum frontend_tune_state *tune_state = &state->tune_state;
    int ret = 10; /* 1ms is the default delay most of the time */

    u8  band = (u8)BAND_OF_FREQUENCY(fe->dtv_property_cache.frequency/1000);
    u32 freq = fe->dtv_property_cache.frequency/1000 + (band == BAND_VHF ? state->cfg->freq_offset_khz_vhf : state->cfg->freq_offset_khz_uhf);

#ifdef CONFIG_SYS_ISDBT
    if (state->fe->dtv_property_cache.delivery_system == SYS_ISDBT && state->fe->dtv_property_cache.isdbt_sb_mode == 1)
        if (((state->fe->dtv_property_cache.isdbt_sb_segment_count % 2)
             && (state->fe->dtv_property_cache.isdbt_sb_segment_idx == ((state->fe->dtv_property_cache.isdbt_sb_segment_count / 2) + 1)))
            || (((state->fe->dtv_property_cache.isdbt_sb_segment_count % 2) == 0)
            && (state->fe->dtv_property_cache.isdbt_sb_segment_idx == (state->fe->dtv_property_cache.isdbt_sb_segment_count / 2)))
            || (((state->fe->dtv_property_cache.isdbt_sb_segment_count % 2) == 0)
            && (state->fe->dtv_property_cache.isdbt_sb_segment_idx == ((state->fe->dtv_property_cache.isdbt_sb_segment_count / 2) + 1))))
            freq += 850;
#endif
    if (state->current_rf != freq) {

    switch (state->revision) {
    case DIB0070S_P1A:
        tune = dib0070s_tuning_table;
        lna_match = dib0070_lna;
        break;
    default:
        tune = dib0070_tuning_table;
        if (state->cfg->flip_chip)
        lna_match = dib0070_lna_flip_chip;
        else
        lna_match = dib0070_lna;
        break;
    }
    while (freq > tune->max_freq) /* find the right one */
        tune++;
    while (freq > lna_match->max_freq) /* find the right one */
        lna_match++;

    state->current_tune_table_index = tune;
    state->lna_match = lna_match;
    }

    if (*tune_state == CT_TUNER_START) {
    dprintk("Tuning for Band: %hd (%d kHz)", band, freq);
    if (state->current_rf != freq) {
        u8 REFDIV;
        u32 FBDiv, Rest, FREF, VCOF_kHz;
        u8 Den;

        state->current_rf = freq;
        state->lo4 = (state->current_tune_table_index->vco_band << 11) | (state->current_tune_table_index->hfdiv << 7);


        dib0070_write_reg(state, 0x17, 0x30);


        VCOF_kHz = state->current_tune_table_index->vco_multi * freq * 2;

        switch (band) {
        case BAND_VHF:
            REFDIV = (u8) ((state->cfg->clock_khz + 9999) / 10000);
            break;
        case BAND_FM:
            REFDIV = (u8) ((state->cfg->clock_khz) / 1000);
            break;
        default:
            REFDIV = (u8) (state->cfg->clock_khz  / 10000);
            break;
        }
        FREF = state->cfg->clock_khz / REFDIV;



        switch (state->revision) {
        case DIB0070S_P1A:
            FBDiv = (VCOF_kHz / state->current_tune_table_index->presc / FREF);
            Rest  = (VCOF_kHz / state->current_tune_table_index->presc) - FBDiv * FREF;
            break;

        case DIB0070_P1G:
        case DIB0070_P1F:
        default:
            FBDiv = (freq / (FREF / 2));
            Rest  = 2 * freq - FBDiv * FREF;
            break;
        }

        if (Rest < LPF)
            Rest = 0;
        else if (Rest < 2 * LPF)
            Rest = 2 * LPF;
        else if (Rest > (FREF - LPF)) {
            Rest = 0;
            FBDiv += 1;
        } else if (Rest > (FREF - 2 * LPF))
            Rest = FREF - 2 * LPF;
        Rest = (Rest * 6528) / (FREF / 10);

        Den = 1;
        if (Rest > 0) {
            state->lo4 |= (1 << 14) | (1 << 12);
            Den = 255;
        }


        dib0070_write_reg(state, 0x11, (u16)FBDiv);
        dib0070_write_reg(state, 0x12, (Den << 8) | REFDIV);
        dib0070_write_reg(state, 0x13, (u16) Rest);

        if (state->revision == DIB0070S_P1A) {

            if (band == BAND_SBAND) {
                dib0070_set_ctrl_lo5(fe, 2, 4, 3, 0);
                dib0070_write_reg(state, 0x1d, 0xFFFF);
            } else
                dib0070_set_ctrl_lo5(fe, 5, 4, 3, 1);
        }

        dib0070_write_reg(state, 0x20,
            0x0040 | 0x0020 | 0x0010 | 0x0008 | 0x0002 | 0x0001 | state->current_tune_table_index->tuner_enable);

        dprintk("REFDIV: %hd, FREF: %d", REFDIV, FREF);
        dprintk("FBDIV: %d, Rest: %d", FBDiv, Rest);
        dprintk("Num: %hd, Den: %hd, SD: %hd", (u16) Rest, Den, (state->lo4 >> 12) & 0x1);
        dprintk("HFDIV code: %hd", state->current_tune_table_index->hfdiv);
        dprintk("VCO = %hd", state->current_tune_table_index->vco_band);
        dprintk("VCOF: ((%hd*%d) << 1))", state->current_tune_table_index->vco_multi, freq);

        *tune_state = CT_TUNER_STEP_0;
    } else { /* we are already tuned to this frequency - the configuration is correct  */
        ret = 50; /* wakeup time */
        *tune_state = CT_TUNER_STEP_5;
    }
    } else if ((*tune_state > CT_TUNER_START) && (*tune_state < CT_TUNER_STEP_4)) {

    ret = dib0070_captrim(state, tune_state);

    } else if (*tune_state == CT_TUNER_STEP_4) {
    const struct dib0070_wbd_gain_cfg *tmp = state->cfg->wbd_gain;
    if (tmp != NULL) {
        while (freq/1000 > tmp->freq) /* find the right one */
            tmp++;
        dib0070_write_reg(state, 0x0f,
            (0 << 15) | (1 << 14) | (3 << 12)
            | (tmp->wbd_gain_val << 9) | (0 << 8) | (1 << 7)
            | (state->current_tune_table_index->wbdmux << 0));
        state->wbd_gain_current = tmp->wbd_gain_val;
    } else {
            dib0070_write_reg(state, 0x0f,
                      (0 << 15) | (1 << 14) | (3 << 12) | (6 << 9) | (0 << 8) | (1 << 7) | (state->current_tune_table_index->
                                                        wbdmux << 0));
        state->wbd_gain_current = 6;
    }

    dib0070_write_reg(state, 0x06, 0x3fff);
        dib0070_write_reg(state, 0x07,
                  (state->current_tune_table_index->switch_trim << 11) | (7 << 8) | (state->lna_match->lna_band << 3) | (3 << 0));
    dib0070_write_reg(state, 0x08, (state->lna_match->lna_band << 10) | (3 << 7) | (127));
    dib0070_write_reg(state, 0x0d, 0x0d80);


    dib0070_write_reg(state, 0x18,   0x07ff);
    dib0070_write_reg(state, 0x17, 0x0033);


    *tune_state = CT_TUNER_STEP_5;
    } else if (*tune_state == CT_TUNER_STEP_5) {
    dib0070_set_bandwidth(fe);
    *tune_state = CT_TUNER_STOP;
    } else {
    ret = FE_CALLBACK_TIME_NEVER; /* tuner finished, time to call again infinite */
    }
    return ret;
}


static int dib0070_tune(struct dvb_frontend *fe)
{
    struct dib0070_state *state = fe->tuner_priv;
    uint32_t ret;

    state->tune_state = CT_TUNER_START;

    do {
    ret = dib0070_tune_digital(fe);
    if (ret != FE_CALLBACK_TIME_NEVER)
        msleep(ret/10);
    else
        break;
    } while (state->tune_state != CT_TUNER_STOP);

    return 0;
}

static int dib0070_wakeup(struct dvb_frontend *fe)
{
    struct dib0070_state *state = fe->tuner_priv;
    if (state->cfg->sleep)
        state->cfg->sleep(fe, 0);
    return 0;
}

static int dib0070_sleep(struct dvb_frontend *fe)
{
    struct dib0070_state *state = fe->tuner_priv;
    if (state->cfg->sleep)
        state->cfg->sleep(fe, 1);
    return 0;
}

u8 dib0070_get_rf_output(struct dvb_frontend *fe)
{
    struct dib0070_state *state = fe->tuner_priv;
    return (dib0070_read_reg(state, 0x07) >> 11) & 0x3;
}
EXPORT_SYMBOL(dib0070_get_rf_output);

int dib0070_set_rf_output(struct dvb_frontend *fe, u8 no)
{
    struct dib0070_state *state = fe->tuner_priv;
    u16 rxrf2 = dib0070_read_reg(state, 0x07) & 0xfe7ff;
    if (no > 3)
        no = 3;
    if (no < 1)
        no = 1;
    return dib0070_write_reg(state, 0x07, rxrf2 | (no << 11));
}
EXPORT_SYMBOL(dib0070_set_rf_output);

static const u16 dib0070_p1f_defaults[] =

{
    7, 0x02,
        0x0008,
        0x0000,
        0x0000,
        0x0000,
        0x0000,
        0x0002,
        0x0100,

    3, 0x0d,
        0x0d80,
        0x0001,
        0x0000,

    4, 0x11,
        0x0000,
        0x0103,
        0x0000,
        0x0000,

    3, 0x16,
        0x0004 | 0x0040,
        0x0030,
        0x07ff,

    6, 0x1b,
        0x4112,
        0xff00,
        0xc07f,
        0x0000,
        0x0180,
        0x4000 | 0x0800 | 0x0040 | 0x0020 | 0x0010 | 0x0008 | 0x0002 | 0x0001,

    0,
};

static u16 dib0070_read_wbd_offset(struct dib0070_state *state, u8 gain)
{
    u16 tuner_en = dib0070_read_reg(state, 0x20);
    u16 offset;

    dib0070_write_reg(state, 0x18, 0x07ff);
    dib0070_write_reg(state, 0x20, 0x0800 | 0x4000 | 0x0040 | 0x0020 | 0x0010 | 0x0008 | 0x0002 | 0x0001);
    dib0070_write_reg(state, 0x0f, (1 << 14) | (2 << 12) | (gain << 9) | (1 << 8) | (1 << 7) | (0 << 0));
    msleep(9);
    offset = dib0070_read_reg(state, 0x19);
    dib0070_write_reg(state, 0x20, tuner_en);
    return offset;
}

static void dib0070_wbd_offset_calibration(struct dib0070_state *state)
{
    u8 gain;
    for (gain = 6; gain < 8; gain++) {
    state->wbd_offset_3_3[gain - 6] = ((dib0070_read_wbd_offset(state, gain) * 8 * 18 / 33 + 1) / 2);
    dprintk("Gain: %d, WBDOffset (3.3V) = %hd", gain, state->wbd_offset_3_3[gain-6]);
    }
}

u16 dib0070_wbd_offset(struct dvb_frontend *fe)
{
    struct dib0070_state *state = fe->tuner_priv;
    const struct dib0070_wbd_gain_cfg *tmp = state->cfg->wbd_gain;
    u32 freq = fe->dtv_property_cache.frequency/1000;

    if (tmp != NULL) {
    while (freq/1000 > tmp->freq) /* find the right one */
        tmp++;
    state->wbd_gain_current = tmp->wbd_gain_val;
    } else
    state->wbd_gain_current = 6;

    return state->wbd_offset_3_3[state->wbd_gain_current - 6];
}
EXPORT_SYMBOL(dib0070_wbd_offset);

#define pgm_read_word(w) (*w)
static int dib0070_reset(struct dvb_frontend *fe)
{
    struct dib0070_state *state = fe->tuner_priv;
    u16 l, r, *n;

    HARD_RESET(state);


#ifndef FORCE_SBAND_TUNER
    if ((dib0070_read_reg(state, 0x22) >> 9) & 0x1)
        state->revision = (dib0070_read_reg(state, 0x1f) >> 8) & 0xff;
    else
#else
#warning forcing SBAND
#endif
        state->revision = DIB0070S_P1A;

    /* P1F or not */
    dprintk("Revision: %x", state->revision);

    if (state->revision == DIB0070_P1D) {
        dprintk("Error: this driver is not to be used meant for P1D or earlier");
        return -EINVAL;
    }

    n = (u16 *) dib0070_p1f_defaults;
    l = pgm_read_word(n++);
    while (l) {
        r = pgm_read_word(n++);
        do {
            dib0070_write_reg(state, (u8)r, pgm_read_word(n++));
            r++;
        } while (--l);
        l = pgm_read_word(n++);
    }

    if (state->cfg->force_crystal_mode != 0)
        r = state->cfg->force_crystal_mode;
    else if (state->cfg->clock_khz >= 24000)
        r = 1;
    else
        r = 2;


    r |= state->cfg->osc_buffer_state << 3;

    dib0070_write_reg(state, 0x10, r);
    dib0070_write_reg(state, 0x1f, (1 << 8) | ((state->cfg->clock_pad_drive & 0xf) << 5));

    if (state->cfg->invert_iq) {
        r = dib0070_read_reg(state, 0x02) & 0xffdf;
        dib0070_write_reg(state, 0x02, r | (1 << 5));
    }

    if (state->revision == DIB0070S_P1A)
    dib0070_set_ctrl_lo5(fe, 2, 4, 3, 0);
    else
        dib0070_set_ctrl_lo5(fe, 5, 4, state->cfg->charge_pump, state->cfg->enable_third_order_filter);

    dib0070_write_reg(state, 0x01, (54 << 9) | 0xc8);

    dib0070_wbd_offset_calibration(state);

    return 0;
}

static int dib0070_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
    struct dib0070_state *state = fe->tuner_priv;

    *frequency = 1000 * state->current_rf;
    return 0;
}

static int dib0070_release(struct dvb_frontend *fe)
{
    kfree(fe->tuner_priv);
    fe->tuner_priv = NULL;
    return 0;
}

static const struct dvb_tuner_ops dib0070_ops = {
    .info = {
        .name           = "DiBcom DiB0070",
        .frequency_min  =  45000000,
        .frequency_max  = 860000000,
        .frequency_step =      1000,
    },
    .release       = dib0070_release,

    .init          = dib0070_wakeup,
    .sleep         = dib0070_sleep,
    .set_params    = dib0070_tune,

    .get_frequency = dib0070_get_frequency,
//      .get_bandwidth = dib0070_get_bandwidth
};

struct dvb_frontend *dib0070_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct dib0070_config *cfg)
{
    struct dib0070_state *state = kzalloc(sizeof(struct dib0070_state), GFP_KERNEL);
    if (state == NULL)
        return NULL;

    state->cfg = cfg;
    state->i2c = i2c;
    state->fe  = fe;
    mutex_init(&state->i2c_buffer_lock);
    fe->tuner_priv = state;

    if (dib0070_reset(fe) != 0)
        goto free_mem;

    printk(KERN_INFO "DiB0070: successfully identified\n");
    memcpy(&fe->ops.tuner_ops, &dib0070_ops, sizeof(struct dvb_tuner_ops));

    fe->tuner_priv = state;
    return fe;

free_mem:
    kfree(state);
    fe->tuner_priv = NULL;
    return NULL;
}
EXPORT_SYMBOL(dib0070_attach);

MODULE_AUTHOR("Patrick Boettcher <[email protected]>");
MODULE_DESCRIPTION("Driver for the DiBcom 0070 base-band RF Tuner");
MODULE_LICENSE("GPL");