drivers/media/dvb/pt1/va1j5jf8007s.c - kernel/msm - Gitiles

 /*
  * ISDB-S driver for VA1J5JF8007
  *
  * Copyright (C) 2009 HIRANO Takahito <hiranotaka@zng.info>
  *
  * based on pt1dvr - http://pt1dvr.sourceforge.jp/
  * 	by Tomoaki Ishikawa <tomy@users.sourceforge.jp>
  *
  * 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 "va1j5jf8007s.h"

 enum va1j5jf8007s_tune_state {
 	VA1J5JF8007S_IDLE,
 	VA1J5JF8007S_SET_FREQUENCY_1,
 	VA1J5JF8007S_SET_FREQUENCY_2,
 	VA1J5JF8007S_SET_FREQUENCY_3,
 	VA1J5JF8007S_CHECK_FREQUENCY,
 	VA1J5JF8007S_SET_MODULATION,
 	VA1J5JF8007S_CHECK_MODULATION,
 	VA1J5JF8007S_SET_TS_ID,
 	VA1J5JF8007S_CHECK_TS_ID,
 	VA1J5JF8007S_TRACK,
 };

 struct va1j5jf8007s_state {
 	const struct va1j5jf8007s_config *config;
 	struct i2c_adapter *adap;
 	struct dvb_frontend fe;
 	enum va1j5jf8007s_tune_state tune_state;
 };

 static int va1j5jf8007s_read_snr(struct dvb_frontend *fe, u16 *snr)
 {
 	struct va1j5jf8007s_state *state;
 	u8 addr;
 	int i;
 	u8 write_buf[1], read_buf[1];
 	struct i2c_msg msgs[2];
 	s32 word, x1, x2, x3, x4, x5, y;

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

 	word = 0;
 	for (i = 0; i < 2; i++) {
 		write_buf[0] = 0xbc + 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];
 	}

 	word -= 3000;
 	if (word < 0)
 		word = 0;

 	x1 = int_sqrt(word << 16) * ((15625ll << 21) / 1000000);
 	x2 = (s64)x1 * x1 >> 31;
 	x3 = (s64)x2 * x1 >> 31;
 	x4 = (s64)x2 * x2 >> 31;
 	x5 = (s64)x4 * x1 >> 31;

 	y = (58857ll << 23) / 1000;
 	y -= (s64)x1 * ((89565ll << 24) / 1000) >> 30;
 	y += (s64)x2 * ((88977ll << 24) / 1000) >> 28;
 	y -= (s64)x3 * ((50259ll << 25) / 1000) >> 27;
 	y += (s64)x4 * ((14341ll << 27) / 1000) >> 27;
 	y -= (s64)x5 * ((16346ll << 30) / 10000) >> 28;

 	*snr = y < 0 ? 0 : y >> 15;
 	return 0;
 }

 static int va1j5jf8007s_get_frontend_algo(struct dvb_frontend *fe)
 {
 	return DVBFE_ALGO_HW;
 }

 static int
 va1j5jf8007s_read_status(struct dvb_frontend *fe, fe_status_t *status)
 {
 	struct va1j5jf8007s_state *state;

 	state = fe->demodulator_priv;

 	switch (state->tune_state) {
 	case VA1J5JF8007S_IDLE:
 	case VA1J5JF8007S_SET_FREQUENCY_1:
 	case VA1J5JF8007S_SET_FREQUENCY_2:
 	case VA1J5JF8007S_SET_FREQUENCY_3:
 	case VA1J5JF8007S_CHECK_FREQUENCY:
 		*status = 0;
 		return 0;


 	case VA1J5JF8007S_SET_MODULATION:
 	case VA1J5JF8007S_CHECK_MODULATION:
 		*status |= FE_HAS_SIGNAL;
 		return 0;

 	case VA1J5JF8007S_SET_TS_ID:
 	case VA1J5JF8007S_CHECK_TS_ID:
 		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
 		return 0;

 	case VA1J5JF8007S_TRACK:
 		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
 		return 0;
 	}

 	BUG();
 }

 struct va1j5jf8007s_cb_map {
 	u32 frequency;
 	u8 cb;
 };

 static const struct va1j5jf8007s_cb_map va1j5jf8007s_cb_maps[] = {
 	{  986000, 0xb2 },
 	{ 1072000, 0xd2 },
 	{ 1154000, 0xe2 },
 	{ 1291000, 0x20 },
 	{ 1447000, 0x40 },
 	{ 1615000, 0x60 },
 	{ 1791000, 0x80 },
 	{ 1972000, 0xa0 },
 };

 static u8 va1j5jf8007s_lookup_cb(u32 frequency)
 {
 	int i;
 	const struct va1j5jf8007s_cb_map *map;

 	for (i = 0; i < ARRAY_SIZE(va1j5jf8007s_cb_maps); i++) {
 		map = &va1j5jf8007s_cb_maps[i];
 		if (frequency < map->frequency)
 			return map->cb;
 	}
 	return 0xc0;
 }

 static int va1j5jf8007s_set_frequency_1(struct va1j5jf8007s_state *state)
 {
 	u32 frequency;
 	u16 word;
 	u8 buf[6];
 	struct i2c_msg msg;

 	frequency = state->fe.dtv_property_cache.frequency;

 	word = (frequency + 500) / 1000;
 	if (frequency < 1072000)
 		word = (word << 1 & ~0x1f) | (word & 0x0f);

 	buf[0] = 0xfe;
 	buf[1] = 0xc0;
 	buf[2] = 0x40 | word >> 8;
 	buf[3] = word;
 	buf[4] = 0xe0;
 	buf[5] = va1j5jf8007s_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 va1j5jf8007s_set_frequency_2(struct va1j5jf8007s_state *state)
 {
 	u8 buf[3];
 	struct i2c_msg msg;

 	buf[0] = 0xfe;
 	buf[1] = 0xc0;
 	buf[2] = 0xe4;

 	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 va1j5jf8007s_set_frequency_3(struct va1j5jf8007s_state *state)
 {
 	u32 frequency;
 	u8 buf[4];
 	struct i2c_msg msg;

 	frequency = state->fe.dtv_property_cache.frequency;

 	buf[0] = 0xfe;
 	buf[1] = 0xc0;
 	buf[2] = 0xf4;
 	buf[3] = va1j5jf8007s_lookup_cb(frequency) | 0x4;

 	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
 va1j5jf8007s_check_frequency(struct va1j5jf8007s_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] = 0xc1;

 	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 va1j5jf8007s_set_modulation(struct va1j5jf8007s_state *state)
 {
 	u8 buf[2];
 	struct i2c_msg msg;

 	buf[0] = 0x03;
 	buf[1] = 0x01;

 	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
 va1j5jf8007s_check_modulation(struct va1j5jf8007s_state *state, int *lock)
 {
 	u8 addr;
 	u8 write_buf[1], read_buf[1];
 	struct i2c_msg msgs[2];

 	addr = state->config->demod_address;

 	write_buf[0] = 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] & 0x10);
 	return 0;
 }

 static int
 va1j5jf8007s_set_ts_id(struct va1j5jf8007s_state *state)
 {
 	u32 ts_id;
 	u8 buf[3];
 	struct i2c_msg msg;

 	ts_id = state->fe.dtv_property_cache.isdbs_ts_id;
 	if (!ts_id)
 		return 0;

 	buf[0] = 0x8f;
 	buf[1] = ts_id >> 8;
 	buf[2] = ts_id;

 	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
 va1j5jf8007s_check_ts_id(struct va1j5jf8007s_state *state, int *lock)
 {
 	u8 addr;
 	u8 write_buf[1], read_buf[2];
 	struct i2c_msg msgs[2];
 	u32 ts_id;

 	ts_id = state->fe.dtv_property_cache.isdbs_ts_id;
 	if (!ts_id) {
 		*lock = 1;
 		return 0;
 	}

 	addr = state->config->demod_address;

 	write_buf[0] = 0xe6;

 	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] << 8 | read_buf[1]) == ts_id;
 	return 0;
 }

 static int
 va1j5jf8007s_tune(struct dvb_frontend *fe,
 		  struct dvb_frontend_parameters *params,
 		  unsigned int mode_flags,  unsigned int *delay,
 		  fe_status_t *status)
 {
 	struct va1j5jf8007s_state *state;
 	int ret;
 	int lock = 0;

 	state = fe->demodulator_priv;

 	if (params != NULL)
 		state->tune_state = VA1J5JF8007S_SET_FREQUENCY_1;

 	switch (state->tune_state) {
 	case VA1J5JF8007S_IDLE:
 		*delay = 3 * HZ;
 		*status = 0;
 		return 0;

 	case VA1J5JF8007S_SET_FREQUENCY_1:
 		ret = va1j5jf8007s_set_frequency_1(state);
 		if (ret < 0)
 			return ret;

 		state->tune_state = VA1J5JF8007S_SET_FREQUENCY_2;
 		*delay = 0;
 		*status = 0;
 		return 0;

 	case VA1J5JF8007S_SET_FREQUENCY_2:
 		ret = va1j5jf8007s_set_frequency_2(state);
 		if (ret < 0)
 			return ret;

 		state->tune_state = VA1J5JF8007S_SET_FREQUENCY_3;
 		*delay = (HZ + 99) / 100;
 		*status = 0;
 		return 0;

 	case VA1J5JF8007S_SET_FREQUENCY_3:
 		ret = va1j5jf8007s_set_frequency_3(state);
 		if (ret < 0)
 			return ret;

 		state->tune_state = VA1J5JF8007S_CHECK_FREQUENCY;
 		*delay = 0;
 		*status = 0;
 		return 0;

 	case VA1J5JF8007S_CHECK_FREQUENCY:
 		ret = va1j5jf8007s_check_frequency(state, &lock);
 		if (ret < 0)
 			return ret;

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

 		state->tune_state = VA1J5JF8007S_SET_MODULATION;
 		*delay = 0;
 		*status = FE_HAS_SIGNAL;
 		return 0;

 	case VA1J5JF8007S_SET_MODULATION:
 		ret = va1j5jf8007s_set_modulation(state);
 		if (ret < 0)
 			return ret;

 		state->tune_state = VA1J5JF8007S_CHECK_MODULATION;
 		*delay = 0;
 		*status = FE_HAS_SIGNAL;
 		return 0;

 	case VA1J5JF8007S_CHECK_MODULATION:
 		ret = va1j5jf8007s_check_modulation(state, &lock);
 		if (ret < 0)
 			return ret;

 		if (!lock)  {
 			*delay = (HZ + 49) / 50;
 			*status = FE_HAS_SIGNAL;
 			return 0;
 		}

 		state->tune_state = VA1J5JF8007S_SET_TS_ID;
 		*delay = 0;
 		*status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
 		return 0;

 	case VA1J5JF8007S_SET_TS_ID:
 		ret = va1j5jf8007s_set_ts_id(state);
 		if (ret < 0)
 			return ret;

 		state->tune_state = VA1J5JF8007S_CHECK_TS_ID;
 		return 0;

 	case VA1J5JF8007S_CHECK_TS_ID:
 		ret = va1j5jf8007s_check_ts_id(state, &lock);
 		if (ret < 0)
 			return ret;

 		if (!lock)  {
 			*delay = (HZ + 99) / 100;
 			*status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
 			return 0;
 		}

 		state->tune_state = VA1J5JF8007S_TRACK;
 		/* fall through */

 	case VA1J5JF8007S_TRACK:
 		*delay = 3 * HZ;
 		*status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
 		return 0;
 	}

 	BUG();
 }

 static int va1j5jf8007s_init_frequency(struct va1j5jf8007s_state *state)
 {
 	u8 buf[4];
 	struct i2c_msg msg;

 	buf[0] = 0xfe;
 	buf[1] = 0xc0;
 	buf[2] = 0xf0;
 	buf[3] = 0x04;

 	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 va1j5jf8007s_set_sleep(struct va1j5jf8007s_state *state, int sleep)
 {
 	u8 buf[2];
 	struct i2c_msg msg;

 	buf[0] = 0x17;
 	buf[1] = sleep ? 0x01 : 0x00;

 	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 va1j5jf8007s_sleep(struct dvb_frontend *fe)
 {
 	struct va1j5jf8007s_state *state;
 	int ret;

 	state = fe->demodulator_priv;

 	ret = va1j5jf8007s_init_frequency(state);
 	if (ret < 0)
 		return ret;

 	return va1j5jf8007s_set_sleep(state, 1);
 }

 static int va1j5jf8007s_init(struct dvb_frontend *fe)
 {
 	struct va1j5jf8007s_state *state;

 	state = fe->demodulator_priv;
 	state->tune_state = VA1J5JF8007S_IDLE;

 	return va1j5jf8007s_set_sleep(state, 0);
 }

 static void va1j5jf8007s_release(struct dvb_frontend *fe)
 {
 	struct va1j5jf8007s_state *state;
 	state = fe->demodulator_priv;
 	kfree(state);
 }

 static struct dvb_frontend_ops va1j5jf8007s_ops = {
 	.info = {
 		.name = "VA1J5JF8007 ISDB-S",
 		.type = FE_QPSK,
 		.frequency_min = 950000,
 		.frequency_max = 2150000,
 		.frequency_stepsize = 1000,
 		.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 = va1j5jf8007s_read_snr,
 	.get_frontend_algo = va1j5jf8007s_get_frontend_algo,
 	.read_status = va1j5jf8007s_read_status,
 	.tune = va1j5jf8007s_tune,
 	.sleep = va1j5jf8007s_sleep,
 	.init = va1j5jf8007s_init,
 	.release = va1j5jf8007s_release,
 };

 static int va1j5jf8007s_prepare_1(struct va1j5jf8007s_state *state)
 {
 	u8 addr;
 	u8 write_buf[1], read_buf[1];
 	struct i2c_msg msgs[2];

 	addr = state->config->demod_address;

 	write_buf[0] = 0x07;

 	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;

 	if (read_buf[0] != 0x41)
 		return -EIO;

 	return 0;
 }

 static const u8 va1j5jf8007s_prepare_bufs[][2] = {
 	{0x04, 0x02}, {0x0d, 0x55}, {0x11, 0x40}, {0x13, 0x80}, {0x17, 0x01},
 	{0x1c, 0x0a}, {0x1d, 0xaa}, {0x1e, 0x20}, {0x1f, 0x88}, {0x51, 0xb0},
 	{0x52, 0x89}, {0x53, 0xb3}, {0x5a, 0x2d}, {0x5b, 0xd3}, {0x85, 0x69},
 	{0x87, 0x04}, {0x8e, 0x02}, {0xa3, 0xf7}, {0xa5, 0xc0},
 };

 static int va1j5jf8007s_prepare_2(struct va1j5jf8007s_state *state)
 {
 	u8 addr;
 	u8 buf[2];
 	struct i2c_msg msg;
 	int i;

 	addr = state->config->demod_address;

 	msg.addr = addr;
 	msg.flags = 0;
 	msg.len = 2;
 	msg.buf = buf;
 	for (i = 0; i < ARRAY_SIZE(va1j5jf8007s_prepare_bufs); i++) {
 		memcpy(buf, va1j5jf8007s_prepare_bufs[i], sizeof(buf));
 		if (i2c_transfer(state->adap, &msg, 1) != 1)
 			return -EREMOTEIO;
 	}

 	return 0;
 }

 /* must be called after va1j5jf8007t_attach */
 int va1j5jf8007s_prepare(struct dvb_frontend *fe)
 {
 	struct va1j5jf8007s_state *state;
 	int ret;

 	state = fe->demodulator_priv;

 	ret = va1j5jf8007s_prepare_1(state);
 	if (ret < 0)
 		return ret;

 	ret = va1j5jf8007s_prepare_2(state);
 	if (ret < 0)
 		return ret;

 	return va1j5jf8007s_init_frequency(state);
 }

 struct dvb_frontend *
 va1j5jf8007s_attach(const struct va1j5jf8007s_config *config,
 		    struct i2c_adapter *adap)
 {
 	struct va1j5jf8007s_state *state;
 	struct dvb_frontend *fe;
 	u8 buf[2];
 	struct i2c_msg msg;

 	state = kzalloc(sizeof(struct va1j5jf8007s_state), GFP_KERNEL);
 	if (!state)
 		return NULL;

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

 	fe = &state->fe;
 	memcpy(&fe->ops, &va1j5jf8007s_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;
 }
	/*
	* ISDB-S driver for VA1J5JF8007
	*
	* Copyright (C) 2009 HIRANO Takahito <hiranotaka@zng.info>
	*
	* based on pt1dvr - http://pt1dvr.sourceforge.jp/
	* by Tomoaki Ishikawa <tomy@users.sourceforge.jp>
	*
	* 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 "va1j5jf8007s.h"

	enum va1j5jf8007s_tune_state {
	VA1J5JF8007S_IDLE,
	VA1J5JF8007S_SET_FREQUENCY_1,
	VA1J5JF8007S_SET_FREQUENCY_2,
	VA1J5JF8007S_SET_FREQUENCY_3,
	VA1J5JF8007S_CHECK_FREQUENCY,
	VA1J5JF8007S_SET_MODULATION,
	VA1J5JF8007S_CHECK_MODULATION,
	VA1J5JF8007S_SET_TS_ID,
	VA1J5JF8007S_CHECK_TS_ID,
	VA1J5JF8007S_TRACK,
	};

	struct va1j5jf8007s_state {
	const struct va1j5jf8007s_config *config;
	struct i2c_adapter *adap;
	struct dvb_frontend fe;
	enum va1j5jf8007s_tune_state tune_state;
	};

	static int va1j5jf8007s_read_snr(struct dvb_frontend fe, u16 snr)
	{
	struct va1j5jf8007s_state *state;
	u8 addr;
	int i;
	u8 write_buf[1], read_buf[1];
	struct i2c_msg msgs[2];
	s32 word, x1, x2, x3, x4, x5, y;

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

	word = 0;
	for (i = 0; i < 2; i++) {
	write_buf[0] = 0xbc + 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];
	}

	word -= 3000;
	if (word < 0)
	word = 0;

	x1 = int_sqrt(word << 16) * ((15625ll << 21) / 1000000);
	x2 = (s64)x1 * x1 >> 31;
	x3 = (s64)x2 * x1 >> 31;
	x4 = (s64)x2 * x2 >> 31;
	x5 = (s64)x4 * x1 >> 31;

	y = (58857ll << 23) / 1000;
	y -= (s64)x1 * ((89565ll << 24) / 1000) >> 30;
	y += (s64)x2 * ((88977ll << 24) / 1000) >> 28;
	y -= (s64)x3 * ((50259ll << 25) / 1000) >> 27;
	y += (s64)x4 * ((14341ll << 27) / 1000) >> 27;
	y -= (s64)x5 * ((16346ll << 30) / 10000) >> 28;

	*snr = y < 0 ? 0 : y >> 15;
	return 0;
	}

	static int va1j5jf8007s_get_frontend_algo(struct dvb_frontend *fe)
	{
	return DVBFE_ALGO_HW;
	}

	static int
	va1j5jf8007s_read_status(struct dvb_frontend fe, fe_status_t status)
	{
	struct va1j5jf8007s_state *state;

	state = fe->demodulator_priv;

	switch (state->tune_state) {
	case VA1J5JF8007S_IDLE:
	case VA1J5JF8007S_SET_FREQUENCY_1:
	case VA1J5JF8007S_SET_FREQUENCY_2:
	case VA1J5JF8007S_SET_FREQUENCY_3:
	case VA1J5JF8007S_CHECK_FREQUENCY:
	*status = 0;
	return 0;


	case VA1J5JF8007S_SET_MODULATION:
	case VA1J5JF8007S_CHECK_MODULATION:
	*status \|= FE_HAS_SIGNAL;
	return 0;

	case VA1J5JF8007S_SET_TS_ID:
	case VA1J5JF8007S_CHECK_TS_ID:
	*status \|= FE_HAS_SIGNAL \| FE_HAS_CARRIER;
	return 0;

	case VA1J5JF8007S_TRACK:
	*status \|= FE_HAS_SIGNAL \| FE_HAS_CARRIER \| FE_HAS_LOCK;
	return 0;
	}

	BUG();
	}

	struct va1j5jf8007s_cb_map {
	u32 frequency;
	u8 cb;
	};

	static const struct va1j5jf8007s_cb_map va1j5jf8007s_cb_maps[] = {
	{ 986000, 0xb2 },
	{ 1072000, 0xd2 },
	{ 1154000, 0xe2 },
	{ 1291000, 0x20 },
	{ 1447000, 0x40 },
	{ 1615000, 0x60 },
	{ 1791000, 0x80 },
	{ 1972000, 0xa0 },
	};

	static u8 va1j5jf8007s_lookup_cb(u32 frequency)
	{
	int i;
	const struct va1j5jf8007s_cb_map *map;

	for (i = 0; i < ARRAY_SIZE(va1j5jf8007s_cb_maps); i++) {
	map = &va1j5jf8007s_cb_maps[i];
	if (frequency < map->frequency)
	return map->cb;
	}
	return 0xc0;
	}

	static int va1j5jf8007s_set_frequency_1(struct va1j5jf8007s_state *state)
	{
	u32 frequency;
	u16 word;
	u8 buf[6];
	struct i2c_msg msg;

	frequency = state->fe.dtv_property_cache.frequency;

	word = (frequency + 500) / 1000;
	if (frequency < 1072000)
	word = (word << 1 & ~0x1f) \| (word & 0x0f);

	buf[0] = 0xfe;
	buf[1] = 0xc0;
	buf[2] = 0x40 \| word >> 8;
	buf[3] = word;
	buf[4] = 0xe0;
	buf[5] = va1j5jf8007s_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 va1j5jf8007s_set_frequency_2(struct va1j5jf8007s_state *state)
	{
	u8 buf[3];
	struct i2c_msg msg;

	buf[0] = 0xfe;
	buf[1] = 0xc0;
	buf[2] = 0xe4;

	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 va1j5jf8007s_set_frequency_3(struct va1j5jf8007s_state *state)
	{
	u32 frequency;
	u8 buf[4];
	struct i2c_msg msg;

	frequency = state->fe.dtv_property_cache.frequency;

	buf[0] = 0xfe;
	buf[1] = 0xc0;
	buf[2] = 0xf4;
	buf[3] = va1j5jf8007s_lookup_cb(frequency) \| 0x4;

	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
	va1j5jf8007s_check_frequency(struct va1j5jf8007s_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] = 0xc1;

	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 va1j5jf8007s_set_modulation(struct va1j5jf8007s_state *state)
	{
	u8 buf[2];
	struct i2c_msg msg;

	buf[0] = 0x03;
	buf[1] = 0x01;

	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
	va1j5jf8007s_check_modulation(struct va1j5jf8007s_state state, int lock)
	{
	u8 addr;
	u8 write_buf[1], read_buf[1];
	struct i2c_msg msgs[2];

	addr = state->config->demod_address;

	write_buf[0] = 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] & 0x10);
	return 0;
	}

	static int
	va1j5jf8007s_set_ts_id(struct va1j5jf8007s_state *state)
	{
	u32 ts_id;
	u8 buf[3];
	struct i2c_msg msg;

	ts_id = state->fe.dtv_property_cache.isdbs_ts_id;
	if (!ts_id)
	return 0;

	buf[0] = 0x8f;
	buf[1] = ts_id >> 8;
	buf[2] = ts_id;

	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
	va1j5jf8007s_check_ts_id(struct va1j5jf8007s_state state, int lock)
	{
	u8 addr;
	u8 write_buf[1], read_buf[2];
	struct i2c_msg msgs[2];
	u32 ts_id;

	ts_id = state->fe.dtv_property_cache.isdbs_ts_id;
	if (!ts_id) {
	*lock = 1;
	return 0;
	}

	addr = state->config->demod_address;

	write_buf[0] = 0xe6;

	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] << 8 \| read_buf[1]) == ts_id;
	return 0;
	}

	static int
	va1j5jf8007s_tune(struct dvb_frontend *fe,
	struct dvb_frontend_parameters *params,
	unsigned int mode_flags, unsigned int *delay,
	fe_status_t *status)
	{
	struct va1j5jf8007s_state *state;
	int ret;
	int lock = 0;

	state = fe->demodulator_priv;

	if (params != NULL)
	state->tune_state = VA1J5JF8007S_SET_FREQUENCY_1;

	switch (state->tune_state) {
	case VA1J5JF8007S_IDLE:
	delay = 3 HZ;
	*status = 0;
	return 0;

	case VA1J5JF8007S_SET_FREQUENCY_1:
	ret = va1j5jf8007s_set_frequency_1(state);
	if (ret < 0)
	return ret;

	state->tune_state = VA1J5JF8007S_SET_FREQUENCY_2;
	*delay = 0;
	*status = 0;
	return 0;

	case VA1J5JF8007S_SET_FREQUENCY_2:
	ret = va1j5jf8007s_set_frequency_2(state);
	if (ret < 0)
	return ret;

	state->tune_state = VA1J5JF8007S_SET_FREQUENCY_3;
	*delay = (HZ + 99) / 100;
	*status = 0;
	return 0;

	case VA1J5JF8007S_SET_FREQUENCY_3:
	ret = va1j5jf8007s_set_frequency_3(state);
	if (ret < 0)
	return ret;

	state->tune_state = VA1J5JF8007S_CHECK_FREQUENCY;
	*delay = 0;
	*status = 0;
	return 0;

	case VA1J5JF8007S_CHECK_FREQUENCY:
	ret = va1j5jf8007s_check_frequency(state, &lock);
	if (ret < 0)
	return ret;

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

	state->tune_state = VA1J5JF8007S_SET_MODULATION;
	*delay = 0;
	*status = FE_HAS_SIGNAL;
	return 0;

	case VA1J5JF8007S_SET_MODULATION:
	ret = va1j5jf8007s_set_modulation(state);
	if (ret < 0)
	return ret;

	state->tune_state = VA1J5JF8007S_CHECK_MODULATION;
	*delay = 0;
	*status = FE_HAS_SIGNAL;
	return 0;

	case VA1J5JF8007S_CHECK_MODULATION:
	ret = va1j5jf8007s_check_modulation(state, &lock);
	if (ret < 0)
	return ret;

	if (!lock) {
	*delay = (HZ + 49) / 50;
	*status = FE_HAS_SIGNAL;
	return 0;
	}

	state->tune_state = VA1J5JF8007S_SET_TS_ID;
	*delay = 0;
	*status = FE_HAS_SIGNAL \| FE_HAS_CARRIER;
	return 0;

	case VA1J5JF8007S_SET_TS_ID:
	ret = va1j5jf8007s_set_ts_id(state);
	if (ret < 0)
	return ret;

	state->tune_state = VA1J5JF8007S_CHECK_TS_ID;
	return 0;

	case VA1J5JF8007S_CHECK_TS_ID:
	ret = va1j5jf8007s_check_ts_id(state, &lock);
	if (ret < 0)
	return ret;

	if (!lock) {
	*delay = (HZ + 99) / 100;
	*status = FE_HAS_SIGNAL \| FE_HAS_CARRIER;
	return 0;
	}

	state->tune_state = VA1J5JF8007S_TRACK;
	/* fall through */

	case VA1J5JF8007S_TRACK:
	delay = 3 HZ;
	*status = FE_HAS_SIGNAL \| FE_HAS_CARRIER \| FE_HAS_LOCK;
	return 0;
	}

	BUG();
	}

	static int va1j5jf8007s_init_frequency(struct va1j5jf8007s_state *state)
	{
	u8 buf[4];
	struct i2c_msg msg;

	buf[0] = 0xfe;
	buf[1] = 0xc0;
	buf[2] = 0xf0;
	buf[3] = 0x04;

	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 va1j5jf8007s_set_sleep(struct va1j5jf8007s_state *state, int sleep)
	{
	u8 buf[2];
	struct i2c_msg msg;

	buf[0] = 0x17;
	buf[1] = sleep ? 0x01 : 0x00;

	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 va1j5jf8007s_sleep(struct dvb_frontend *fe)
	{
	struct va1j5jf8007s_state *state;
	int ret;

	state = fe->demodulator_priv;

	ret = va1j5jf8007s_init_frequency(state);
	if (ret < 0)
	return ret;

	return va1j5jf8007s_set_sleep(state, 1);
	}

	static int va1j5jf8007s_init(struct dvb_frontend *fe)
	{
	struct va1j5jf8007s_state *state;

	state = fe->demodulator_priv;
	state->tune_state = VA1J5JF8007S_IDLE;

	return va1j5jf8007s_set_sleep(state, 0);
	}

	static void va1j5jf8007s_release(struct dvb_frontend *fe)
	{
	struct va1j5jf8007s_state *state;
	state = fe->demodulator_priv;
	kfree(state);
	}

	static struct dvb_frontend_ops va1j5jf8007s_ops = {
	.info = {
	.name = "VA1J5JF8007 ISDB-S",
	.type = FE_QPSK,
	.frequency_min = 950000,
	.frequency_max = 2150000,
	.frequency_stepsize = 1000,
	.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 = va1j5jf8007s_read_snr,
	.get_frontend_algo = va1j5jf8007s_get_frontend_algo,
	.read_status = va1j5jf8007s_read_status,
	.tune = va1j5jf8007s_tune,
	.sleep = va1j5jf8007s_sleep,
	.init = va1j5jf8007s_init,
	.release = va1j5jf8007s_release,
	};

	static int va1j5jf8007s_prepare_1(struct va1j5jf8007s_state *state)
	{
	u8 addr;
	u8 write_buf[1], read_buf[1];
	struct i2c_msg msgs[2];

	addr = state->config->demod_address;

	write_buf[0] = 0x07;

	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;

	if (read_buf[0] != 0x41)
	return -EIO;

	return 0;
	}

	static const u8 va1j5jf8007s_prepare_bufs[][2] = {
	{0x04, 0x02}, {0x0d, 0x55}, {0x11, 0x40}, {0x13, 0x80}, {0x17, 0x01},
	{0x1c, 0x0a}, {0x1d, 0xaa}, {0x1e, 0x20}, {0x1f, 0x88}, {0x51, 0xb0},
	{0x52, 0x89}, {0x53, 0xb3}, {0x5a, 0x2d}, {0x5b, 0xd3}, {0x85, 0x69},
	{0x87, 0x04}, {0x8e, 0x02}, {0xa3, 0xf7}, {0xa5, 0xc0},
	};

	static int va1j5jf8007s_prepare_2(struct va1j5jf8007s_state *state)
	{
	u8 addr;
	u8 buf[2];
	struct i2c_msg msg;
	int i;

	addr = state->config->demod_address;

	msg.addr = addr;
	msg.flags = 0;
	msg.len = 2;
	msg.buf = buf;
	for (i = 0; i < ARRAY_SIZE(va1j5jf8007s_prepare_bufs); i++) {
	memcpy(buf, va1j5jf8007s_prepare_bufs[i], sizeof(buf));
	if (i2c_transfer(state->adap, &msg, 1) != 1)
	return -EREMOTEIO;
	}

	return 0;
	}

	/* must be called after va1j5jf8007t_attach */
	int va1j5jf8007s_prepare(struct dvb_frontend *fe)
	{
	struct va1j5jf8007s_state *state;
	int ret;

	state = fe->demodulator_priv;

	ret = va1j5jf8007s_prepare_1(state);
	if (ret < 0)
	return ret;

	ret = va1j5jf8007s_prepare_2(state);
	if (ret < 0)
	return ret;

	return va1j5jf8007s_init_frequency(state);
	}

	struct dvb_frontend *
	va1j5jf8007s_attach(const struct va1j5jf8007s_config *config,
	struct i2c_adapter *adap)
	{
	struct va1j5jf8007s_state *state;
	struct dvb_frontend *fe;
	u8 buf[2];
	struct i2c_msg msg;

	state = kzalloc(sizeof(struct va1j5jf8007s_state), GFP_KERNEL);
	if (!state)
	return NULL;

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

	fe = &state->fe;
	memcpy(&fe->ops, &va1j5jf8007s_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;
	}