/* * 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/moduleparam.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 0x85 struct 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 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 = ®, .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 }; #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; 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\n",(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\n",(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");