drivers/media/dvb/frontends/dib0070.c

/*
 * 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/i2c.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

enum frontend_tune_state {
    CT_TUNER_START = 10,
    CT_TUNER_STEP_0,
    CT_TUNER_STEP_1,
    CT_TUNER_STEP_2,
    CT_TUNER_STEP_3,
    CT_TUNER_STEP_4,
    CT_TUNER_STEP_5,
    CT_TUNER_STEP_6,
    CT_TUNER_STEP_7,
    CT_TUNER_STOP,
};

#define FE_CALLBACK_TIME_NEVER 0xffffffff

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];
};

static uint16_t dib0070_read_reg(struct dib0070_state *state, u8 reg)
{
	u8 b[2];
	struct i2c_msg msg[2] = {
		{ .addr = state->cfg->i2c_address, .flags = 0,        .buf = &reg, .len = 1 },
		{ .addr = state->cfg->i2c_address, .flags = I2C_M_RD, .buf = b,  .len = 2 },
	};
	if (i2c_transfer(state->i2c, msg, 2) != 2) {
		printk(KERN_WARNING "DiB0070 I2C read failed\n");
		return 0;
	}
	return (b[0] << 8) | b[1];
}

static int dib0070_write_reg(struct dib0070_state *state, u8 reg, u16 val)
{
	u8 b[3] = { reg, val >> 8, val & 0xff };
	struct i2c_msg msg = { .addr = state->cfg->i2c_address, .flags = 0, .buf = b, .len = 3 };
	if (i2c_transfer(state->i2c, &msg, 1) != 1) {
		printk(KERN_WARNING "DiB0070 I2C write failed\n");
		return -EREMOTEIO;
	}
	return 0;
}

#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 dvb_frontend_parameters *ch)
{
    struct dib0070_state *st = fe->tuner_priv;
    u16 tmp = dib0070_read_reg(st, 0x02) & 0x3fff;

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

    dib0070_write_reg(st, 0x02, tmp);

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

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

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

static int dib0070_captrim(struct dib0070_state *st, 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(st, 0x0f, 0xed10);
		dib0070_write_reg(st, 0x17,    0x0034);

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

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

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

		adc = dib0070_read_reg(st, 0x19);

		dprintk( "CAPTRIM=%hd; ADC = %hd (ADC) & %dmV", st->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 < st->adc_diff) {
			dprintk( "CAPTRIM=%hd is closer to target (%hd/%hd)", st->captrim, adc, st->adc_diff);
			st->adc_diff = adc;
			st->fcaptrim = st->captrim;



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

		if (st->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(st, 0x14, st->lo4 | st->fcaptrim);
		dib0070_write_reg(st, 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);
}

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                       // define for the loop filter 100kHz by default 16-07-06
static int dib0070_tune_digital(struct dvb_frontend *fe, struct dvb_frontend_parameters *ch)
{
    struct dib0070_state *st = fe->tuner_priv;

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

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

    u8  band = (u8)BAND_OF_FREQUENCY(ch->frequency/1000);
    u32 freq = ch->frequency/1000 + (band == BAND_VHF ? st->cfg->freq_offset_khz_vhf : st->cfg->freq_offset_khz_uhf);





#ifdef CONFIG_STANDARD_ISDBT
    if (fe->dtv_property_cache.delivery_system == SYS_ISDBT && ch->u.isdbt.sb_mode == 1)
	if ( ( (ch->u.isdbt.sb_conn_total_seg % 2)       && (ch->u.isdbt.sb_wanted_seg == ((ch->u.isdbt.sb_conn_total_seg/2) + 1) ) ) ||
	   ( ( (ch->u.isdbt.sb_conn_total_seg % 2) == 0) && (ch->u.isdbt.sb_wanted_seg ==  (ch->u.isdbt.sb_conn_total_seg/2)      ) ) ||
	   ( ( (ch->u.isdbt.sb_conn_total_seg % 2) == 0) && (ch->u.isdbt.sb_wanted_seg == ((ch->u.isdbt.sb_conn_total_seg/2)+1))) )
	    freq += 850;
#endif
    if (st->current_rf != freq) {

	switch (st->revision) {
	case DIB0070S_P1A:
	    tune = dib0070s_tuning_table;
	    lna_match = dib0070_lna;
	    break;
	default:
	    tune = dib0070_tuning_table;
	    if (st->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++;

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

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

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


	    dib0070_write_reg(st, 0x17, 0x30);


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

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



	    switch (st->revision) {
	    case DIB0070S_P1A:
		FBDiv = (VCOF_kHz / st->current_tune_table_index->presc / FREF);
		Rest  = (VCOF_kHz / st->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) {
		st->lo4 |= (1 << 14) | (1 << 12);
		Den = 255;
	    }


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

	    if (st->revision == DIB0070S_P1A) {

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


	    dib0070_write_reg(st, 0x20, 0x0040 | 0x0020 | 0x0010 | 0x0008 | 0x0002 | 0x0001 | st->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, (st->lo4 >> 12) & 0x1);
	    dprintk( "HFDIV code: %hd", st->current_tune_table_index->hfdiv);
	    dprintk( "VCO = %hd", st->current_tune_table_index->vco_band);
	    dprintk( "VCOF: ((%hd*%d) << 1))", st->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(st, tune_state);

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

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


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


	*tune_state = CT_TUNER_STEP_5;
    } else if (*tune_state == CT_TUNER_STEP_5) {
	dib0070_set_bandwidth(fe, ch);
	*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 dvb_frontend_parameters *p)
{
    struct dib0070_state *state = fe->tuner_priv;
    uint32_t ret;

    state->tune_state = CT_TUNER_START;

    do {
	ret = dib0070_tune_digital(fe, p);
	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 *st = fe->tuner_priv;
	if (st->cfg->sleep)
		st->cfg->sleep(fe, 0);
	return 0;
}

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

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 *st = fe->tuner_priv;
	return st->wbd_offset_3_3[st->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_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;
	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 <pboettcher@dibcom.fr>");
MODULE_DESCRIPTION("Driver for the DiBcom 0070 base-band RF Tuner");
MODULE_LICENSE("GPL");