/* *  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 "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 0x85struct mt2266_priv {	struct mt2266_config *cfg;	struct i2c_adapter   *i2c;	u32 frequency;	u32 bandwidth;};/* 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 registerstatic 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 registerstatic 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 registersstatic 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 sequencesstatic 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 };#define FREF 30000       // Quartz oscillator 30 MHzstatic 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;	priv = fe->tuner_priv;	mt2266_writereg(priv,0x17,0x6d);	mt2266_writereg(priv,0x1c,0xff);	freq = params->frequency / 1000; // Hz -> kHz	priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;	priv->frequency = freq * 1000;	tune=2 * freq * (8192/16) / (FREF/16);	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;	msleep(100);	mt2266_writeregs(priv,(params->u.ofdm.bandwidth==BANDWIDTH_6_MHZ)?mt2266_init_6mhz:				(params->u.ofdm.bandwidth==BANDWIDTH_7_MHZ)?mt2266_init_7mhz:				mt2266_init_8mhz,sizeof(mt2266_init_8mhz));	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",(int)tune,(int)lnaband);	dprintk("set_parms: [1..3]: %2x %2x %2x",(int)b[1],(int)b[2],(int)b[3]);	b[0] = 0x05;	b[1] = 0x62;	b[2] = lnaband;	mt2266_writeregs(priv,b,3);	//Waits for pll lock or timeout	i = 0;	do {		mt2266_readreg(priv,REG_LOCK,b);		if ((b[0] & 0x40)==0x40)			break;		msleep(10);		i++;	} while (i<10);	dprintk("Lock when i=%i",(int)i);	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){	struct mt2266_priv *priv = fe->tuner_priv;	mt2266_writereg(priv,0x17,0x6d);	mt2266_writereg(priv,0x1c,0xff);	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  = 470000000,		.frequency_max  = 860000000,		.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;	if (mt2266_readreg(priv,0,&id) != 0) {		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");