drivers/media/tuners/tuner_it913x.c - linux - Git at Google

 /*
  * ITE Tech IT9137 silicon tuner driver
  *
  *  Copyright (C) 2011 Malcolm Priestley (tvboxspy@gmail.com)
  *  IT9137 Copyright (C) ITE Tech Inc.
  *
  *  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 "tuner_it913x_priv.h"

 struct it913x_state {
 	struct i2c_adapter *i2c_adap;
 	u8 i2c_addr;
 	u8 chip_ver;
 	u8 tuner_type;
 	u8 firmware_ver;
 	u16 tun_xtal;
 	u8 tun_fdiv;
 	u8 tun_clk_mode;
 	u32 tun_fn_min;
 };

 /* read multiple registers */
 static int it913x_rd_regs(struct it913x_state *state,
 		u32 reg, u8 *data, u8 count)
 {
 	int ret;
 	u8 b[3];
 	struct i2c_msg msg[2] = {
 		{ .addr = state->i2c_addr, .flags = 0,
 			.buf = b, .len = sizeof(b) },
 		{ .addr = state->i2c_addr, .flags = I2C_M_RD,
 			.buf = data, .len = count }
 	};
 	b[0] = (u8)(reg >> 16) & 0xff;
 	b[1] = (u8)(reg >> 8) & 0xff;
 	b[2] = (u8) reg & 0xff;
 	b[0] |= 0x80; /* All reads from demodulator */

 	ret = i2c_transfer(state->i2c_adap, msg, 2);

 	return ret;
 }

 /* read single register */
 static int it913x_rd_reg(struct it913x_state *state, u32 reg)
 {
 	int ret;
 	u8 b[1];
 	ret = it913x_rd_regs(state, reg, &b[0], sizeof(b));
 	return (ret < 0) ? -ENODEV : b[0];
 }

 /* write multiple registers */
 static int it913x_wr_regs(struct it913x_state *state,
 		u8 pro, u32 reg, u8 buf[], u8 count)
 {
 	u8 b[256];
 	struct i2c_msg msg[1] = {
 		{ .addr = state->i2c_addr, .flags = 0,
 		  .buf = b, .len = 3 + count }
 	};
 	int ret;
 	b[0] = (u8)(reg >> 16) & 0xff;
 	b[1] = (u8)(reg >> 8) & 0xff;
 	b[2] = (u8) reg & 0xff;
 	memcpy(&b[3], buf, count);

 	if (pro == PRO_DMOD)
 		b[0] |= 0x80;

 	ret = i2c_transfer(state->i2c_adap, msg, 1);

 	if (ret < 0)
 		return -EIO;

 	return 0;
 }

 /* write single register */
 static int it913x_wr_reg(struct it913x_state *state,
 		u8 pro, u32 reg, u32 data)
 {
 	int ret;
 	u8 b[4];
 	u8 s;

 	b[0] = data >> 24;
 	b[1] = (data >> 16) & 0xff;
 	b[2] = (data >> 8) & 0xff;
 	b[3] = data & 0xff;
 	/* expand write as needed */
 	if (data < 0x100)
 		s = 3;
 	else if (data < 0x1000)
 		s = 2;
 	else if (data < 0x100000)
 		s = 1;
 	else
 		s = 0;

 	ret = it913x_wr_regs(state, pro, reg, &b[s], sizeof(b) - s);

 	return ret;
 }

 static int it913x_script_loader(struct it913x_state *state,
 		struct it913xset *loadscript)
 {
 	int ret, i;
 	if (loadscript == NULL)
 		return -EINVAL;

 	for (i = 0; i < 1000; ++i) {
 		if (loadscript[i].pro == 0xff)
 			break;
 		ret = it913x_wr_regs(state, loadscript[i].pro,
 			loadscript[i].address,
 			loadscript[i].reg, loadscript[i].count);
 		if (ret < 0)
 			return -ENODEV;
 	}
 	return 0;
 }

 static int it913x_init(struct dvb_frontend *fe)
 {
 	struct it913x_state *state = fe->tuner_priv;
 	int ret, i, reg;
 	u8 val, nv_val;
 	u8 nv[] = {48, 32, 24, 16, 12, 8, 6, 4, 2};
 	u8 b[2];

 	reg = it913x_rd_reg(state, 0xec86);
 	switch (reg) {
 	case 0:
 		state->tun_clk_mode = reg;
 		state->tun_xtal = 2000;
 		state->tun_fdiv = 3;
 		val = 16;
 		break;
 	case -ENODEV:
 		return -ENODEV;
 	case 1:
 	default:
 		state->tun_clk_mode = reg;
 		state->tun_xtal = 640;
 		state->tun_fdiv = 1;
 		val = 6;
 		break;
 	}

 	reg = it913x_rd_reg(state, 0xed03);

 	if (reg < 0)
 		return -ENODEV;
 	else if (reg < ARRAY_SIZE(nv))
 		nv_val = nv[reg];
 	else
 		nv_val = 2;

 	for (i = 0; i < 50; i++) {
 		ret = it913x_rd_regs(state, 0xed23, &b[0], sizeof(b));
 		reg = (b[1] << 8) + b[0];
 		if (reg > 0)
 			break;
 		if (ret < 0)
 			return -ENODEV;
 		udelay(2000);
 	}
 	state->tun_fn_min = state->tun_xtal * reg;
 	state->tun_fn_min /= (state->tun_fdiv * nv_val);
 	dev_dbg(&state->i2c_adap->dev, "%s: Tuner fn_min %d\n", __func__,
 			state->tun_fn_min);

 	if (state->chip_ver > 1)
 		msleep(50);
 	else {
 		for (i = 0; i < 50; i++) {
 			reg = it913x_rd_reg(state, 0xec82);
 			if (reg > 0)
 				break;
 			if (reg < 0)
 				return -ENODEV;
 			udelay(2000);
 		}
 	}

 	/* Power Up Tuner - common all versions */
 	ret = it913x_wr_reg(state, PRO_DMOD, 0xec40, 0x1);
 	ret |= it913x_wr_reg(state, PRO_DMOD, 0xfba8, 0x0);
 	ret |= it913x_wr_reg(state, PRO_DMOD, 0xec57, 0x0);
 	ret |= it913x_wr_reg(state, PRO_DMOD, 0xec58, 0x0);

 	return it913x_wr_reg(state, PRO_DMOD, 0xed81, val);
 }

 static int it9137_set_params(struct dvb_frontend *fe)
 {
 	struct it913x_state *state = fe->tuner_priv;
 	struct it913xset *set_tuner = set_it9137_template;
 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 	u32 bandwidth = p->bandwidth_hz;
 	u32 frequency_m = p->frequency;
 	int ret, reg;
 	u32 frequency = frequency_m / 1000;
 	u32 freq, temp_f, tmp;
 	u16 iqik_m_cal;
 	u16 n_div;
 	u8 n;
 	u8 l_band;
 	u8 lna_band;
 	u8 bw;

 	if (state->firmware_ver == 1)
 		set_tuner = set_it9135_template;
 	else
 		set_tuner = set_it9137_template;

 	dev_dbg(&state->i2c_adap->dev, "%s: Tuner Frequency %d Bandwidth %d\n",
 			__func__, frequency, bandwidth);

 	if (frequency >= 51000 && frequency <= 440000) {
 		l_band = 0;
 		lna_band = 0;
 	} else if (frequency > 440000 && frequency <= 484000) {
 		l_band = 1;
 		lna_band = 1;
 	} else if (frequency > 484000 && frequency <= 533000) {
 		l_band = 1;
 		lna_band = 2;
 	} else if (frequency > 533000 && frequency <= 587000) {
 		l_band = 1;
 		lna_band = 3;
 	} else if (frequency > 587000 && frequency <= 645000) {
 		l_band = 1;
 		lna_band = 4;
 	} else if (frequency > 645000 && frequency <= 710000) {
 		l_band = 1;
 		lna_band = 5;
 	} else if (frequency > 710000 && frequency <= 782000) {
 		l_band = 1;
 		lna_band = 6;
 	} else if (frequency > 782000 && frequency <= 860000) {
 		l_band = 1;
 		lna_band = 7;
 	} else if (frequency > 1450000 && frequency <= 1492000) {
 		l_band = 1;
 		lna_band = 0;
 	} else if (frequency > 1660000 && frequency <= 1685000) {
 		l_band = 1;
 		lna_band = 1;
 	} else
 		return -EINVAL;
 	set_tuner[0].reg[0] = lna_band;

 	switch (bandwidth) {
 	case 5000000:
 		bw = 0;
 		break;
 	case 6000000:
 		bw = 2;
 		break;
 	case 7000000:
 		bw = 4;
 		break;
 	default:
 	case 8000000:
 		bw = 6;
 		break;
 	}

 	set_tuner[1].reg[0] = bw;
 	set_tuner[2].reg[0] = 0xa0 | (l_band << 3);

 	if (frequency > 53000 && frequency <= 74000) {
 		n_div = 48;
 		n = 0;
 	} else if (frequency > 74000 && frequency <= 111000) {
 		n_div = 32;
 		n = 1;
 	} else if (frequency > 111000 && frequency <= 148000) {
 		n_div = 24;
 		n = 2;
 	} else if (frequency > 148000 && frequency <= 222000) {
 		n_div = 16;
 		n = 3;
 	} else if (frequency > 222000 && frequency <= 296000) {
 		n_div = 12;
 		n = 4;
 	} else if (frequency > 296000 && frequency <= 445000) {
 		n_div = 8;
 		n = 5;
 	} else if (frequency > 445000 && frequency <= state->tun_fn_min) {
 		n_div = 6;
 		n = 6;
 	} else if (frequency > state->tun_fn_min && frequency <= 950000) {
 		n_div = 4;
 		n = 7;
 	} else if (frequency > 1450000 && frequency <= 1680000) {
 		n_div = 2;
 		n = 0;
 	} else
 		return -EINVAL;

 	reg = it913x_rd_reg(state, 0xed81);
 	iqik_m_cal = (u16)reg * n_div;

 	if (reg < 0x20) {
 		if (state->tun_clk_mode == 0)
 			iqik_m_cal = (iqik_m_cal * 9) >> 5;
 		else
 			iqik_m_cal >>= 1;
 	} else {
 		iqik_m_cal = 0x40 - iqik_m_cal;
 		if (state->tun_clk_mode == 0)
 			iqik_m_cal = ~((iqik_m_cal * 9) >> 5);
 		else
 			iqik_m_cal = ~(iqik_m_cal >> 1);
 	}

 	temp_f = frequency * (u32)n_div * (u32)state->tun_fdiv;
 	freq = temp_f / state->tun_xtal;
 	tmp = freq * state->tun_xtal;

 	if ((temp_f - tmp) >= (state->tun_xtal >> 1))
 		freq++;

 	freq += (u32) n << 13;
 	/* Frequency OMEGA_IQIK_M_CAL_MID*/
 	temp_f = freq + (u32)iqik_m_cal;

 	set_tuner[3].reg[0] =  temp_f & 0xff;
 	set_tuner[4].reg[0] =  (temp_f >> 8) & 0xff;

 	dev_dbg(&state->i2c_adap->dev, "%s: High Frequency = %04x\n",
 			__func__, temp_f);

 	/* Lower frequency */
 	set_tuner[5].reg[0] =  freq & 0xff;
 	set_tuner[6].reg[0] =  (freq >> 8) & 0xff;

 	dev_dbg(&state->i2c_adap->dev, "%s: low Frequency = %04x\n",
 			__func__, freq);

 	ret = it913x_script_loader(state, set_tuner);

 	return (ret < 0) ? -ENODEV : 0;
 }

 /* Power sequence */
 /* Power Up	Tuner on -> Frontend suspend off -> Tuner clk on */
 /* Power Down	Frontend suspend on -> Tuner clk off -> Tuner off */

 static int it913x_sleep(struct dvb_frontend *fe)
 {
 	struct it913x_state *state = fe->tuner_priv;
 	return it913x_script_loader(state, it9137_tuner_off);
 }

 static int it913x_release(struct dvb_frontend *fe)
 {
 	kfree(fe->tuner_priv);
 	return 0;
 }

 static const struct dvb_tuner_ops it913x_tuner_ops = {
 	.info = {
 		.name           = "ITE Tech IT913X",
 		.frequency_min  = 174000000,
 		.frequency_max  = 862000000,
 	},

 	.release = it913x_release,

 	.init = it913x_init,
 	.sleep = it913x_sleep,
 	.set_params = it9137_set_params,
 };

 struct dvb_frontend *it913x_attach(struct dvb_frontend *fe,
 		struct i2c_adapter *i2c_adap, u8 i2c_addr, u8 config)
 {
 	struct it913x_state *state = NULL;

 	/* allocate memory for the internal state */
 	state = kzalloc(sizeof(struct it913x_state), GFP_KERNEL);
 	if (state == NULL)
 		return NULL;

 	state->i2c_adap = i2c_adap;
 	state->i2c_addr = i2c_addr;

 	switch (config) {
 	case AF9033_TUNER_IT9135_38:
 	case AF9033_TUNER_IT9135_51:
 	case AF9033_TUNER_IT9135_52:
 		state->chip_ver = 0x01;
 		break;
 	case AF9033_TUNER_IT9135_60:
 	case AF9033_TUNER_IT9135_61:
 	case AF9033_TUNER_IT9135_62:
 		state->chip_ver = 0x02;
 		break;
 	default:
 		dev_dbg(&i2c_adap->dev,
 				"%s: invalid config=%02x\n", __func__, config);
 		goto error;
 	}

 	state->tuner_type = config;
 	state->firmware_ver = 1;

 	fe->tuner_priv = state;
 	memcpy(&fe->ops.tuner_ops, &it913x_tuner_ops,
 			sizeof(struct dvb_tuner_ops));

 	dev_info(&i2c_adap->dev,
 			"%s: ITE Tech IT913X successfully attached\n",
 			KBUILD_MODNAME);
 	dev_dbg(&i2c_adap->dev, "%s: config=%02x chip_ver=%02x\n",
 			__func__, config, state->chip_ver);

 	return fe;
 error:
 	kfree(state);
 	return NULL;
 }
 EXPORT_SYMBOL(it913x_attach);

 MODULE_DESCRIPTION("ITE Tech IT913X silicon tuner driver");
 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 MODULE_LICENSE("GPL");
	/*
	* ITE Tech IT9137 silicon tuner driver
	*
	* Copyright (C) 2011 Malcolm Priestley (tvboxspy@gmail.com)
	* IT9137 Copyright (C) ITE Tech Inc.
	*
	* 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 "tuner_it913x_priv.h"

	struct it913x_state {
	struct i2c_adapter *i2c_adap;
	u8 i2c_addr;
	u8 chip_ver;
	u8 tuner_type;
	u8 firmware_ver;
	u16 tun_xtal;
	u8 tun_fdiv;
	u8 tun_clk_mode;
	u32 tun_fn_min;
	};

	/* read multiple registers */
	static int it913x_rd_regs(struct it913x_state *state,
	u32 reg, u8 *data, u8 count)
	{
	int ret;
	u8 b[3];
	struct i2c_msg msg[2] = {
	{ .addr = state->i2c_addr, .flags = 0,
	.buf = b, .len = sizeof(b) },
	{ .addr = state->i2c_addr, .flags = I2C_M_RD,
	.buf = data, .len = count }
	};
	b[0] = (u8)(reg >> 16) & 0xff;
	b[1] = (u8)(reg >> 8) & 0xff;
	b[2] = (u8) reg & 0xff;
	b[0] \|= 0x80; /* All reads from demodulator */

	ret = i2c_transfer(state->i2c_adap, msg, 2);

	return ret;
	}

	/* read single register */
	static int it913x_rd_reg(struct it913x_state *state, u32 reg)
	{
	int ret;
	u8 b[1];
	ret = it913x_rd_regs(state, reg, &b[0], sizeof(b));
	return (ret < 0) ? -ENODEV : b[0];
	}

	/* write multiple registers */
	static int it913x_wr_regs(struct it913x_state *state,
	u8 pro, u32 reg, u8 buf[], u8 count)
	{
	u8 b[256];
	struct i2c_msg msg[1] = {
	{ .addr = state->i2c_addr, .flags = 0,
	.buf = b, .len = 3 + count }
	};
	int ret;
	b[0] = (u8)(reg >> 16) & 0xff;
	b[1] = (u8)(reg >> 8) & 0xff;
	b[2] = (u8) reg & 0xff;
	memcpy(&b[3], buf, count);

	if (pro == PRO_DMOD)
	b[0] \|= 0x80;

	ret = i2c_transfer(state->i2c_adap, msg, 1);

	if (ret < 0)
	return -EIO;

	return 0;
	}

	/* write single register */
	static int it913x_wr_reg(struct it913x_state *state,
	u8 pro, u32 reg, u32 data)
	{
	int ret;
	u8 b[4];
	u8 s;

	b[0] = data >> 24;
	b[1] = (data >> 16) & 0xff;
	b[2] = (data >> 8) & 0xff;
	b[3] = data & 0xff;
	/* expand write as needed */
	if (data < 0x100)
	s = 3;
	else if (data < 0x1000)
	s = 2;
	else if (data < 0x100000)
	s = 1;
	else
	s = 0;

	ret = it913x_wr_regs(state, pro, reg, &b[s], sizeof(b) - s);

	return ret;
	}

	static int it913x_script_loader(struct it913x_state *state,
	struct it913xset *loadscript)
	{
	int ret, i;
	if (loadscript == NULL)
	return -EINVAL;

	for (i = 0; i < 1000; ++i) {
	if (loadscript[i].pro == 0xff)
	break;
	ret = it913x_wr_regs(state, loadscript[i].pro,
	loadscript[i].address,
	loadscript[i].reg, loadscript[i].count);
	if (ret < 0)
	return -ENODEV;
	}
	return 0;
	}

	static int it913x_init(struct dvb_frontend *fe)
	{
	struct it913x_state *state = fe->tuner_priv;
	int ret, i, reg;
	u8 val, nv_val;
	u8 nv[] = {48, 32, 24, 16, 12, 8, 6, 4, 2};
	u8 b[2];

	reg = it913x_rd_reg(state, 0xec86);
	switch (reg) {
	case 0:
	state->tun_clk_mode = reg;
	state->tun_xtal = 2000;
	state->tun_fdiv = 3;
	val = 16;
	break;
	case -ENODEV:
	return -ENODEV;
	case 1:
	default:
	state->tun_clk_mode = reg;
	state->tun_xtal = 640;
	state->tun_fdiv = 1;
	val = 6;
	break;
	}

	reg = it913x_rd_reg(state, 0xed03);

	if (reg < 0)
	return -ENODEV;
	else if (reg < ARRAY_SIZE(nv))
	nv_val = nv[reg];
	else
	nv_val = 2;

	for (i = 0; i < 50; i++) {
	ret = it913x_rd_regs(state, 0xed23, &b[0], sizeof(b));
	reg = (b[1] << 8) + b[0];
	if (reg > 0)
	break;
	if (ret < 0)
	return -ENODEV;
	udelay(2000);
	}
	state->tun_fn_min = state->tun_xtal * reg;
	state->tun_fn_min /= (state->tun_fdiv * nv_val);
	dev_dbg(&state->i2c_adap->dev, "%s: Tuner fn_min %d\n", __func__,
	state->tun_fn_min);

	if (state->chip_ver > 1)
	msleep(50);
	else {
	for (i = 0; i < 50; i++) {
	reg = it913x_rd_reg(state, 0xec82);
	if (reg > 0)
	break;
	if (reg < 0)
	return -ENODEV;
	udelay(2000);
	}
	}

	/* Power Up Tuner - common all versions */
	ret = it913x_wr_reg(state, PRO_DMOD, 0xec40, 0x1);
	ret \|= it913x_wr_reg(state, PRO_DMOD, 0xfba8, 0x0);
	ret \|= it913x_wr_reg(state, PRO_DMOD, 0xec57, 0x0);
	ret \|= it913x_wr_reg(state, PRO_DMOD, 0xec58, 0x0);

	return it913x_wr_reg(state, PRO_DMOD, 0xed81, val);
	}

	static int it9137_set_params(struct dvb_frontend *fe)
	{
	struct it913x_state *state = fe->tuner_priv;
	struct it913xset *set_tuner = set_it9137_template;
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	u32 bandwidth = p->bandwidth_hz;
	u32 frequency_m = p->frequency;
	int ret, reg;
	u32 frequency = frequency_m / 1000;
	u32 freq, temp_f, tmp;
	u16 iqik_m_cal;
	u16 n_div;
	u8 n;
	u8 l_band;
	u8 lna_band;
	u8 bw;

	if (state->firmware_ver == 1)
	set_tuner = set_it9135_template;
	else
	set_tuner = set_it9137_template;

	dev_dbg(&state->i2c_adap->dev, "%s: Tuner Frequency %d Bandwidth %d\n",
	__func__, frequency, bandwidth);

	if (frequency >= 51000 && frequency <= 440000) {
	l_band = 0;
	lna_band = 0;
	} else if (frequency > 440000 && frequency <= 484000) {
	l_band = 1;
	lna_band = 1;
	} else if (frequency > 484000 && frequency <= 533000) {
	l_band = 1;
	lna_band = 2;
	} else if (frequency > 533000 && frequency <= 587000) {
	l_band = 1;
	lna_band = 3;
	} else if (frequency > 587000 && frequency <= 645000) {
	l_band = 1;
	lna_band = 4;
	} else if (frequency > 645000 && frequency <= 710000) {
	l_band = 1;
	lna_band = 5;
	} else if (frequency > 710000 && frequency <= 782000) {
	l_band = 1;
	lna_band = 6;
	} else if (frequency > 782000 && frequency <= 860000) {
	l_band = 1;
	lna_band = 7;
	} else if (frequency > 1450000 && frequency <= 1492000) {
	l_band = 1;
	lna_band = 0;
	} else if (frequency > 1660000 && frequency <= 1685000) {
	l_band = 1;
	lna_band = 1;
	} else
	return -EINVAL;
	set_tuner[0].reg[0] = lna_band;

	switch (bandwidth) {
	case 5000000:
	bw = 0;
	break;
	case 6000000:
	bw = 2;
	break;
	case 7000000:
	bw = 4;
	break;
	default:
	case 8000000:
	bw = 6;
	break;
	}

	set_tuner[1].reg[0] = bw;
	set_tuner[2].reg[0] = 0xa0 \| (l_band << 3);

	if (frequency > 53000 && frequency <= 74000) {
	n_div = 48;
	n = 0;
	} else if (frequency > 74000 && frequency <= 111000) {
	n_div = 32;
	n = 1;
	} else if (frequency > 111000 && frequency <= 148000) {
	n_div = 24;
	n = 2;
	} else if (frequency > 148000 && frequency <= 222000) {
	n_div = 16;
	n = 3;
	} else if (frequency > 222000 && frequency <= 296000) {
	n_div = 12;
	n = 4;
	} else if (frequency > 296000 && frequency <= 445000) {
	n_div = 8;
	n = 5;
	} else if (frequency > 445000 && frequency <= state->tun_fn_min) {
	n_div = 6;
	n = 6;
	} else if (frequency > state->tun_fn_min && frequency <= 950000) {
	n_div = 4;
	n = 7;
	} else if (frequency > 1450000 && frequency <= 1680000) {
	n_div = 2;
	n = 0;
	} else
	return -EINVAL;

	reg = it913x_rd_reg(state, 0xed81);
	iqik_m_cal = (u16)reg * n_div;

	if (reg < 0x20) {
	if (state->tun_clk_mode == 0)
	iqik_m_cal = (iqik_m_cal * 9) >> 5;
	else
	iqik_m_cal >>= 1;
	} else {
	iqik_m_cal = 0x40 - iqik_m_cal;
	if (state->tun_clk_mode == 0)
	iqik_m_cal = ~((iqik_m_cal * 9) >> 5);
	else
	iqik_m_cal = ~(iqik_m_cal >> 1);
	}

	temp_f = frequency * (u32)n_div * (u32)state->tun_fdiv;
	freq = temp_f / state->tun_xtal;
	tmp = freq * state->tun_xtal;

	if ((temp_f - tmp) >= (state->tun_xtal >> 1))
	freq++;

	freq += (u32) n << 13;
	/* Frequency OMEGA_IQIK_M_CAL_MID*/
	temp_f = freq + (u32)iqik_m_cal;

	set_tuner[3].reg[0] = temp_f & 0xff;
	set_tuner[4].reg[0] = (temp_f >> 8) & 0xff;

	dev_dbg(&state->i2c_adap->dev, "%s: High Frequency = %04x\n",
	__func__, temp_f);

	/* Lower frequency */
	set_tuner[5].reg[0] = freq & 0xff;
	set_tuner[6].reg[0] = (freq >> 8) & 0xff;

	dev_dbg(&state->i2c_adap->dev, "%s: low Frequency = %04x\n",
	__func__, freq);

	ret = it913x_script_loader(state, set_tuner);

	return (ret < 0) ? -ENODEV : 0;
	}

	/* Power sequence */
	/* Power Up Tuner on -> Frontend suspend off -> Tuner clk on */
	/* Power Down Frontend suspend on -> Tuner clk off -> Tuner off */

	static int it913x_sleep(struct dvb_frontend *fe)
	{
	struct it913x_state *state = fe->tuner_priv;
	return it913x_script_loader(state, it9137_tuner_off);
	}

	static int it913x_release(struct dvb_frontend *fe)
	{
	kfree(fe->tuner_priv);
	return 0;
	}

	static const struct dvb_tuner_ops it913x_tuner_ops = {
	.info = {
	.name = "ITE Tech IT913X",
	.frequency_min = 174000000,
	.frequency_max = 862000000,
	},

	.release = it913x_release,

	.init = it913x_init,
	.sleep = it913x_sleep,
	.set_params = it9137_set_params,
	};

	struct dvb_frontend it913x_attach(struct dvb_frontend fe,
	struct i2c_adapter *i2c_adap, u8 i2c_addr, u8 config)
	{
	struct it913x_state *state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct it913x_state), GFP_KERNEL);
	if (state == NULL)
	return NULL;

	state->i2c_adap = i2c_adap;
	state->i2c_addr = i2c_addr;

	switch (config) {
	case AF9033_TUNER_IT9135_38:
	case AF9033_TUNER_IT9135_51:
	case AF9033_TUNER_IT9135_52:
	state->chip_ver = 0x01;
	break;
	case AF9033_TUNER_IT9135_60:
	case AF9033_TUNER_IT9135_61:
	case AF9033_TUNER_IT9135_62:
	state->chip_ver = 0x02;
	break;
	default:
	dev_dbg(&i2c_adap->dev,
	"%s: invalid config=%02x\n", __func__, config);
	goto error;
	}

	state->tuner_type = config;
	state->firmware_ver = 1;

	fe->tuner_priv = state;
	memcpy(&fe->ops.tuner_ops, &it913x_tuner_ops,
	sizeof(struct dvb_tuner_ops));

	dev_info(&i2c_adap->dev,
	"%s: ITE Tech IT913X successfully attached\n",
	KBUILD_MODNAME);
	dev_dbg(&i2c_adap->dev, "%s: config=%02x chip_ver=%02x\n",
	__func__, config, state->chip_ver);

	return fe;
	error:
	kfree(state);
	return NULL;
	}
	EXPORT_SYMBOL(it913x_attach);

	MODULE_DESCRIPTION("ITE Tech IT913X silicon tuner driver");
	MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
	MODULE_LICENSE("GPL");