drivers/media/common/tuners/mt2266.c - maze/linux - Git at Google

 /*
  *  Driver for Microtune MT2266 "Direct conversion low power broadband tuner"
  *
  *  Copyright (c) 2007 Olivier DANET <odanet@caramail.com>
  *
  *  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.
  */

 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/dvb/frontend.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>

 #include "dvb_frontend.h"
 #include "mt2266.h"

 #define I2C_ADDRESS 0x60

 #define REG_PART_REV   0
 #define REG_TUNE       1
 #define REG_BAND       6
 #define REG_BANDWIDTH  8
 #define REG_LOCK       0x12

 #define PART_REV 0x85

 struct mt2266_priv {
 	struct mt2266_config *cfg;
 	struct i2c_adapter   *i2c;

 	u32 frequency;
 	u32 bandwidth;
 	u8 band;
 };

 #define MT2266_VHF 1
 #define MT2266_UHF 0

 /* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */

 static int debug;
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");

 #define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0)

 // Reads a single register
 static int mt2266_readreg(struct mt2266_priv *priv, u8 reg, u8 *val)
 {
 	struct i2c_msg msg[2] = {
 		{ .addr = priv->cfg->i2c_address, .flags = 0,        .buf = &reg, .len = 1 },
 		{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val,  .len = 1 },
 	};
 	if (i2c_transfer(priv->i2c, msg, 2) != 2) {
 		printk(KERN_WARNING "MT2266 I2C read failed\n");
 		return -EREMOTEIO;
 	}
 	return 0;
 }

 // Writes a single register
 static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val)
 {
 	u8 buf[2] = { reg, val };
 	struct i2c_msg msg = {
 		.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
 	};
 	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
 		printk(KERN_WARNING "MT2266 I2C write failed\n");
 		return -EREMOTEIO;
 	}
 	return 0;
 }

 // Writes a set of consecutive registers
 static int mt2266_writeregs(struct mt2266_priv *priv,u8 *buf, u8 len)
 {
 	struct i2c_msg msg = {
 		.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len
 	};
 	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
 		printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len);
 		return -EREMOTEIO;
 	}
 	return 0;
 }

 // Initialisation sequences
 static u8 mt2266_init1[] = { REG_TUNE, 0x00, 0x00, 0x28,
 				 0x00, 0x52, 0x99, 0x3f };

 static u8 mt2266_init2[] = {
     0x17, 0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a, 0xd4,
     0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14,
     0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff,
     0xff, 0x00, 0x77, 0x0f, 0x2d
 };

 static u8 mt2266_init_8mhz[] = { REG_BANDWIDTH, 0x22, 0x22, 0x22, 0x22,
 						0x22, 0x22, 0x22, 0x22 };

 static u8 mt2266_init_7mhz[] = { REG_BANDWIDTH, 0x32, 0x32, 0x32, 0x32,
 						0x32, 0x32, 0x32, 0x32 };

 static u8 mt2266_init_6mhz[] = { REG_BANDWIDTH, 0xa7, 0xa7, 0xa7, 0xa7,
 						0xa7, 0xa7, 0xa7, 0xa7 };

 static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64,
 			   0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 };

 static u8 mt2266_vhf[] = { 0x1d, 0xfe, 0x00, 0x00, 0xb4, 0x03, 0xa5, 0xa5,
 			   0xa5, 0xa5, 0x82, 0xaa, 0xf1, 0x17, 0x80, 0x1f };

 #define FREF 30000       // Quartz oscillator 30 MHz

 static int mt2266_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
 {
 	struct mt2266_priv *priv;
 	int ret=0;
 	u32 freq;
 	u32 tune;
 	u8  lnaband;
 	u8  b[10];
 	int i;
 	u8 band;

 	priv = fe->tuner_priv;

 	freq = params->frequency / 1000; // Hz -> kHz
 	if (freq < 470000 && freq > 230000)
 		return -EINVAL; /* Gap between VHF and UHF bands */
 	priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;
 	priv->frequency = freq * 1000;

 	tune = 2 * freq * (8192/16) / (FREF/16);
 	band = (freq < 300000) ? MT2266_VHF : MT2266_UHF;
 	if (band == MT2266_VHF)
 		tune *= 2;

 	switch (params->u.ofdm.bandwidth) {
 	case BANDWIDTH_6_MHZ:
 		mt2266_writeregs(priv, mt2266_init_6mhz,
 				 sizeof(mt2266_init_6mhz));
 		break;
 	case BANDWIDTH_7_MHZ:
 		mt2266_writeregs(priv, mt2266_init_7mhz,
 				 sizeof(mt2266_init_7mhz));
 		break;
 	case BANDWIDTH_8_MHZ:
 	default:
 		mt2266_writeregs(priv, mt2266_init_8mhz,
 				 sizeof(mt2266_init_8mhz));
 		break;
 	}

 	if (band == MT2266_VHF && priv->band == MT2266_UHF) {
 		dprintk("Switch from UHF to VHF");
 		mt2266_writereg(priv, 0x05, 0x04);
 		mt2266_writereg(priv, 0x19, 0x61);
 		mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf));
 	} else if (band == MT2266_UHF && priv->band == MT2266_VHF) {
 		dprintk("Switch from VHF to UHF");
 		mt2266_writereg(priv, 0x05, 0x52);
 		mt2266_writereg(priv, 0x19, 0x61);
 		mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf));
 	}
 	msleep(10);

 	if (freq <= 495000)
 		lnaband = 0xEE;
 	else if (freq <= 525000)
 		lnaband = 0xDD;
 	else if (freq <= 550000)
 		lnaband = 0xCC;
 	else if (freq <= 580000)
 		lnaband = 0xBB;
 	else if (freq <= 605000)
 		lnaband = 0xAA;
 	else if (freq <= 630000)
 		lnaband = 0x99;
 	else if (freq <= 655000)
 		lnaband = 0x88;
 	else if (freq <= 685000)
 		lnaband = 0x77;
 	else if (freq <= 710000)
 		lnaband = 0x66;
 	else if (freq <= 735000)
 		lnaband = 0x55;
 	else if (freq <= 765000)
 		lnaband = 0x44;
 	else if (freq <= 802000)
 		lnaband = 0x33;
 	else if (freq <= 840000)
 		lnaband = 0x22;
 	else
 		lnaband = 0x11;

 	b[0] = REG_TUNE;
 	b[1] = (tune >> 8) & 0x1F;
 	b[2] = tune & 0xFF;
 	b[3] = tune >> 13;
 	mt2266_writeregs(priv,b,4);

 	dprintk("set_parms: tune=%d band=%d %s",
 		(int) tune, (int) lnaband,
 		(band == MT2266_UHF) ? "UHF" : "VHF");
 	dprintk("set_parms: [1..3]: %2x %2x %2x",
 		(int) b[1], (int) b[2], (int)b[3]);

 	if (band == MT2266_UHF) {
 		b[0] = 0x05;
 		b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62;
 		b[2] = lnaband;
 		mt2266_writeregs(priv, b, 3);
 	}

 	/* Wait for pll lock or timeout */
 	i = 0;
 	do {
 		mt2266_readreg(priv,REG_LOCK,b);
 		if (b[0] & 0x40)
 			break;
 		msleep(10);
 		i++;
 	} while (i<10);
 	dprintk("Lock when i=%i",(int)i);

 	if (band == MT2266_UHF && priv->band == MT2266_VHF)
 		mt2266_writereg(priv, 0x05, 0x62);

 	priv->band = band;

 	return ret;
 }

 static void mt2266_calibrate(struct mt2266_priv *priv)
 {
 	mt2266_writereg(priv, 0x11, 0x03);
 	mt2266_writereg(priv, 0x11, 0x01);
 	mt2266_writeregs(priv, mt2266_init1, sizeof(mt2266_init1));
 	mt2266_writeregs(priv, mt2266_init2, sizeof(mt2266_init2));
 	mt2266_writereg(priv, 0x33, 0x5e);
 	mt2266_writereg(priv, 0x10, 0x10);
 	mt2266_writereg(priv, 0x10, 0x00);
 	mt2266_writeregs(priv, mt2266_init_8mhz, sizeof(mt2266_init_8mhz));
 	msleep(25);
 	mt2266_writereg(priv, 0x17, 0x6d);
 	mt2266_writereg(priv, 0x1c, 0x00);
 	msleep(75);
 	mt2266_writereg(priv, 0x17, 0x6d);
 	mt2266_writereg(priv, 0x1c, 0xff);
 }

 static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 {
 	struct mt2266_priv *priv = fe->tuner_priv;
 	*frequency = priv->frequency;
 	return 0;
 }

 static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 {
 	struct mt2266_priv *priv = fe->tuner_priv;
 	*bandwidth = priv->bandwidth;
 	return 0;
 }

 static int mt2266_init(struct dvb_frontend *fe)
 {
 	int ret;
 	struct mt2266_priv *priv = fe->tuner_priv;
 	ret = mt2266_writereg(priv, 0x17, 0x6d);
 	if (ret < 0)
 		return ret;
 	ret = mt2266_writereg(priv, 0x1c, 0xff);
 	if (ret < 0)
 		return ret;
 	return 0;
 }

 static int mt2266_sleep(struct dvb_frontend *fe)
 {
 	struct mt2266_priv *priv = fe->tuner_priv;
 	mt2266_writereg(priv, 0x17, 0x6d);
 	mt2266_writereg(priv, 0x1c, 0x00);
 	return 0;
 }

 static int mt2266_release(struct dvb_frontend *fe)
 {
 	kfree(fe->tuner_priv);
 	fe->tuner_priv = NULL;
 	return 0;
 }

 static const struct dvb_tuner_ops mt2266_tuner_ops = {
 	.info = {
 		.name           = "Microtune MT2266",
 		.frequency_min  = 174000000,
 		.frequency_max  = 862000000,
 		.frequency_step =     50000,
 	},
 	.release       = mt2266_release,
 	.init          = mt2266_init,
 	.sleep         = mt2266_sleep,
 	.set_params    = mt2266_set_params,
 	.get_frequency = mt2266_get_frequency,
 	.get_bandwidth = mt2266_get_bandwidth
 };

 struct dvb_frontend * mt2266_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2266_config *cfg)
 {
 	struct mt2266_priv *priv = NULL;
 	u8 id = 0;

 	priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL);
 	if (priv == NULL)
 		return NULL;

 	priv->cfg      = cfg;
 	priv->i2c      = i2c;
 	priv->band     = MT2266_UHF;

 	if (mt2266_readreg(priv, 0, &id)) {
 		kfree(priv);
 		return NULL;
 	}
 	if (id != PART_REV) {
 		kfree(priv);
 		return NULL;
 	}
 	printk(KERN_INFO "MT2266: successfully identified\n");
 	memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops));

 	fe->tuner_priv = priv;
 	mt2266_calibrate(priv);
 	return fe;
 }
 EXPORT_SYMBOL(mt2266_attach);

 MODULE_AUTHOR("Olivier DANET");
 MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");
 MODULE_LICENSE("GPL");
	/*
	* Driver for Microtune MT2266 "Direct conversion low power broadband tuner"
	*
	* Copyright (c) 2007 Olivier DANET <odanet@caramail.com>
	*
	* 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.
	*/

	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/dvb/frontend.h>
	#include <linux/i2c.h>
	#include <linux/slab.h>

	#include "dvb_frontend.h"
	#include "mt2266.h"

	#define I2C_ADDRESS 0x60

	#define REG_PART_REV 0
	#define REG_TUNE 1
	#define REG_BAND 6
	#define REG_BANDWIDTH 8
	#define REG_LOCK 0x12

	#define PART_REV 0x85

	struct mt2266_priv {
	struct mt2266_config *cfg;
	struct i2c_adapter *i2c;

	u32 frequency;
	u32 bandwidth;
	u8 band;
	};

	#define MT2266_VHF 1
	#define MT2266_UHF 0

	/* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */

	static int debug;
	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");

	#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0)

	// Reads a single register
	static int mt2266_readreg(struct mt2266_priv priv, u8 reg, u8 val)
	{
	struct i2c_msg msg[2] = {
	{ .addr = priv->cfg->i2c_address, .flags = 0, .buf = &reg, .len = 1 },
	{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val, .len = 1 },
	};
	if (i2c_transfer(priv->i2c, msg, 2) != 2) {
	printk(KERN_WARNING "MT2266 I2C read failed\n");
	return -EREMOTEIO;
	}
	return 0;
	}

	// Writes a single register
	static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val)
	{
	u8 buf[2] = { reg, val };
	struct i2c_msg msg = {
	.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
	};
	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
	printk(KERN_WARNING "MT2266 I2C write failed\n");
	return -EREMOTEIO;
	}
	return 0;
	}

	// Writes a set of consecutive registers
	static int mt2266_writeregs(struct mt2266_priv priv,u8 buf, u8 len)
	{
	struct i2c_msg msg = {
	.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len
	};
	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
	printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len);
	return -EREMOTEIO;
	}
	return 0;
	}

	// Initialisation sequences
	static u8 mt2266_init1[] = { REG_TUNE, 0x00, 0x00, 0x28,
	0x00, 0x52, 0x99, 0x3f };

	static u8 mt2266_init2[] = {
	0x17, 0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a, 0xd4,
	0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff,
	0xff, 0x00, 0x77, 0x0f, 0x2d
	};

	static u8 mt2266_init_8mhz[] = { REG_BANDWIDTH, 0x22, 0x22, 0x22, 0x22,
	0x22, 0x22, 0x22, 0x22 };

	static u8 mt2266_init_7mhz[] = { REG_BANDWIDTH, 0x32, 0x32, 0x32, 0x32,
	0x32, 0x32, 0x32, 0x32 };

	static u8 mt2266_init_6mhz[] = { REG_BANDWIDTH, 0xa7, 0xa7, 0xa7, 0xa7,
	0xa7, 0xa7, 0xa7, 0xa7 };

	static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64,
	0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 };

	static u8 mt2266_vhf[] = { 0x1d, 0xfe, 0x00, 0x00, 0xb4, 0x03, 0xa5, 0xa5,
	0xa5, 0xa5, 0x82, 0xaa, 0xf1, 0x17, 0x80, 0x1f };

	#define FREF 30000 // Quartz oscillator 30 MHz

	static int mt2266_set_params(struct dvb_frontend fe, struct dvb_frontend_parameters params)
	{
	struct mt2266_priv *priv;
	int ret=0;
	u32 freq;
	u32 tune;
	u8 lnaband;
	u8 b[10];
	int i;
	u8 band;

	priv = fe->tuner_priv;

	freq = params->frequency / 1000; // Hz -> kHz
	if (freq < 470000 && freq > 230000)
	return -EINVAL; /* Gap between VHF and UHF bands */
	priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;
	priv->frequency = freq * 1000;

	tune = 2 * freq * (8192/16) / (FREF/16);
	band = (freq < 300000) ? MT2266_VHF : MT2266_UHF;
	if (band == MT2266_VHF)
	tune *= 2;

	switch (params->u.ofdm.bandwidth) {
	case BANDWIDTH_6_MHZ:
	mt2266_writeregs(priv, mt2266_init_6mhz,
	sizeof(mt2266_init_6mhz));
	break;
	case BANDWIDTH_7_MHZ:
	mt2266_writeregs(priv, mt2266_init_7mhz,
	sizeof(mt2266_init_7mhz));
	break;
	case BANDWIDTH_8_MHZ:
	default:
	mt2266_writeregs(priv, mt2266_init_8mhz,
	sizeof(mt2266_init_8mhz));
	break;
	}

	if (band == MT2266_VHF && priv->band == MT2266_UHF) {
	dprintk("Switch from UHF to VHF");
	mt2266_writereg(priv, 0x05, 0x04);
	mt2266_writereg(priv, 0x19, 0x61);
	mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf));
	} else if (band == MT2266_UHF && priv->band == MT2266_VHF) {
	dprintk("Switch from VHF to UHF");
	mt2266_writereg(priv, 0x05, 0x52);
	mt2266_writereg(priv, 0x19, 0x61);
	mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf));
	}
	msleep(10);

	if (freq <= 495000)
	lnaband = 0xEE;
	else if (freq <= 525000)
	lnaband = 0xDD;
	else if (freq <= 550000)
	lnaband = 0xCC;
	else if (freq <= 580000)
	lnaband = 0xBB;
	else if (freq <= 605000)
	lnaband = 0xAA;
	else if (freq <= 630000)
	lnaband = 0x99;
	else if (freq <= 655000)
	lnaband = 0x88;
	else if (freq <= 685000)
	lnaband = 0x77;
	else if (freq <= 710000)
	lnaband = 0x66;
	else if (freq <= 735000)
	lnaband = 0x55;
	else if (freq <= 765000)
	lnaband = 0x44;
	else if (freq <= 802000)
	lnaband = 0x33;
	else if (freq <= 840000)
	lnaband = 0x22;
	else
	lnaband = 0x11;

	b[0] = REG_TUNE;
	b[1] = (tune >> 8) & 0x1F;
	b[2] = tune & 0xFF;
	b[3] = tune >> 13;
	mt2266_writeregs(priv,b,4);

	dprintk("set_parms: tune=%d band=%d %s",
	(int) tune, (int) lnaband,
	(band == MT2266_UHF) ? "UHF" : "VHF");
	dprintk("set_parms: [1..3]: %2x %2x %2x",
	(int) b[1], (int) b[2], (int)b[3]);

	if (band == MT2266_UHF) {
	b[0] = 0x05;
	b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62;
	b[2] = lnaband;
	mt2266_writeregs(priv, b, 3);
	}

	/* Wait for pll lock or timeout */
	i = 0;
	do {
	mt2266_readreg(priv,REG_LOCK,b);
	if (b[0] & 0x40)
	break;
	msleep(10);
	i++;
	} while (i<10);
	dprintk("Lock when i=%i",(int)i);

	if (band == MT2266_UHF && priv->band == MT2266_VHF)
	mt2266_writereg(priv, 0x05, 0x62);

	priv->band = band;

	return ret;
	}

	static void mt2266_calibrate(struct mt2266_priv *priv)
	{
	mt2266_writereg(priv, 0x11, 0x03);
	mt2266_writereg(priv, 0x11, 0x01);
	mt2266_writeregs(priv, mt2266_init1, sizeof(mt2266_init1));
	mt2266_writeregs(priv, mt2266_init2, sizeof(mt2266_init2));
	mt2266_writereg(priv, 0x33, 0x5e);
	mt2266_writereg(priv, 0x10, 0x10);
	mt2266_writereg(priv, 0x10, 0x00);
	mt2266_writeregs(priv, mt2266_init_8mhz, sizeof(mt2266_init_8mhz));
	msleep(25);
	mt2266_writereg(priv, 0x17, 0x6d);
	mt2266_writereg(priv, 0x1c, 0x00);
	msleep(75);
	mt2266_writereg(priv, 0x17, 0x6d);
	mt2266_writereg(priv, 0x1c, 0xff);
	}

	static int mt2266_get_frequency(struct dvb_frontend fe, u32 frequency)
	{
	struct mt2266_priv *priv = fe->tuner_priv;
	*frequency = priv->frequency;
	return 0;
	}

	static int mt2266_get_bandwidth(struct dvb_frontend fe, u32 bandwidth)
	{
	struct mt2266_priv *priv = fe->tuner_priv;
	*bandwidth = priv->bandwidth;
	return 0;
	}

	static int mt2266_init(struct dvb_frontend *fe)
	{
	int ret;
	struct mt2266_priv *priv = fe->tuner_priv;
	ret = mt2266_writereg(priv, 0x17, 0x6d);
	if (ret < 0)
	return ret;
	ret = mt2266_writereg(priv, 0x1c, 0xff);
	if (ret < 0)
	return ret;
	return 0;
	}

	static int mt2266_sleep(struct dvb_frontend *fe)
	{
	struct mt2266_priv *priv = fe->tuner_priv;
	mt2266_writereg(priv, 0x17, 0x6d);
	mt2266_writereg(priv, 0x1c, 0x00);
	return 0;
	}

	static int mt2266_release(struct dvb_frontend *fe)
	{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
	return 0;
	}

	static const struct dvb_tuner_ops mt2266_tuner_ops = {
	.info = {
	.name = "Microtune MT2266",
	.frequency_min = 174000000,
	.frequency_max = 862000000,
	.frequency_step = 50000,
	},
	.release = mt2266_release,
	.init = mt2266_init,
	.sleep = mt2266_sleep,
	.set_params = mt2266_set_params,
	.get_frequency = mt2266_get_frequency,
	.get_bandwidth = mt2266_get_bandwidth
	};

	struct dvb_frontend * mt2266_attach(struct dvb_frontend fe, struct i2c_adapter i2c, struct mt2266_config *cfg)
	{
	struct mt2266_priv *priv = NULL;
	u8 id = 0;

	priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL);
	if (priv == NULL)
	return NULL;

	priv->cfg = cfg;
	priv->i2c = i2c;
	priv->band = MT2266_UHF;

	if (mt2266_readreg(priv, 0, &id)) {
	kfree(priv);
	return NULL;
	}
	if (id != PART_REV) {
	kfree(priv);
	return NULL;
	}
	printk(KERN_INFO "MT2266: successfully identified\n");
	memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops));

	fe->tuner_priv = priv;
	mt2266_calibrate(priv);
	return fe;
	}
	EXPORT_SYMBOL(mt2266_attach);

	MODULE_AUTHOR("Olivier DANET");
	MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");
	MODULE_LICENSE("GPL");