1/* 2 * Driver for Microtune MT2266 "Direct conversion low power broadband tuner" 3 * 4 * Copyright (c) 2007 Olivier DANET <odanet@caramail.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17#include <linux/module.h> 18#include <linux/delay.h> 19#include <linux/dvb/frontend.h> 20#include <linux/i2c.h> 21#include <linux/slab.h> 22 23#include "dvb_frontend.h" 24#include "mt2266.h" 25 26#define I2C_ADDRESS 0x60 27 28#define REG_PART_REV 0 29#define REG_TUNE 1 30#define REG_BAND 6 31#define REG_BANDWIDTH 8 32#define REG_LOCK 0x12 33 34#define PART_REV 0x85 35 36struct mt2266_priv { 37 struct mt2266_config *cfg; 38 struct i2c_adapter *i2c; 39 40 u32 frequency; 41 u32 bandwidth; 42 u8 band; 43}; 44 45#define MT2266_VHF 1 46#define MT2266_UHF 0 47 48/* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */ 49 50static int debug; 51module_param(debug, int, 0644); 52MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); 53 54#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0) 55 56// Reads a single register 57static int mt2266_readreg(struct mt2266_priv *priv, u8 reg, u8 *val) 58{ 59 struct i2c_msg msg[2] = { 60 { .addr = priv->cfg->i2c_address, .flags = 0, .buf = ®, .len = 1 }, 61 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val, .len = 1 }, 62 }; 63 if (i2c_transfer(priv->i2c, msg, 2) != 2) { 64 printk(KERN_WARNING "MT2266 I2C read failed\n"); 65 return -EREMOTEIO; 66 } 67 return 0; 68} 69 70// Writes a single register 71static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val) 72{ 73 u8 buf[2] = { reg, val }; 74 struct i2c_msg msg = { 75 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2 76 }; 77 if (i2c_transfer(priv->i2c, &msg, 1) != 1) { 78 printk(KERN_WARNING "MT2266 I2C write failed\n"); 79 return -EREMOTEIO; 80 } 81 return 0; 82} 83 84// Writes a set of consecutive registers 85static int mt2266_writeregs(struct mt2266_priv *priv,u8 *buf, u8 len) 86{ 87 struct i2c_msg msg = { 88 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len 89 }; 90 if (i2c_transfer(priv->i2c, &msg, 1) != 1) { 91 printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len); 92 return -EREMOTEIO; 93 } 94 return 0; 95} 96 97// Initialisation sequences 98static u8 mt2266_init1[] = { REG_TUNE, 0x00, 0x00, 0x28, 99 0x00, 0x52, 0x99, 0x3f }; 100 101static u8 mt2266_init2[] = { 102 0x17, 0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a, 0xd4, 103 0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14, 104 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff, 105 0xff, 0x00, 0x77, 0x0f, 0x2d 106}; 107 108static u8 mt2266_init_8mhz[] = { REG_BANDWIDTH, 0x22, 0x22, 0x22, 0x22, 109 0x22, 0x22, 0x22, 0x22 }; 110 111static u8 mt2266_init_7mhz[] = { REG_BANDWIDTH, 0x32, 0x32, 0x32, 0x32, 112 0x32, 0x32, 0x32, 0x32 }; 113 114static u8 mt2266_init_6mhz[] = { REG_BANDWIDTH, 0xa7, 0xa7, 0xa7, 0xa7, 115 0xa7, 0xa7, 0xa7, 0xa7 }; 116 117static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64, 118 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 }; 119 120static u8 mt2266_vhf[] = { 0x1d, 0xfe, 0x00, 0x00, 0xb4, 0x03, 0xa5, 0xa5, 121 0xa5, 0xa5, 0x82, 0xaa, 0xf1, 0x17, 0x80, 0x1f }; 122 123#define FREF 30000 // Quartz oscillator 30 MHz 124 125static int mt2266_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params) 126{ 127 struct mt2266_priv *priv; 128 int ret=0; 129 u32 freq; 130 u32 tune; 131 u8 lnaband; 132 u8 b[10]; 133 int i; 134 u8 band; 135 136 priv = fe->tuner_priv; 137 138 freq = params->frequency / 1000; // Hz -> kHz 139 if (freq < 470000 && freq > 230000) 140 return -EINVAL; /* Gap between VHF and UHF bands */ 141 priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0; 142 priv->frequency = freq * 1000; 143 144 tune = 2 * freq * (8192/16) / (FREF/16); 145 band = (freq < 300000) ? MT2266_VHF : MT2266_UHF; 146 if (band == MT2266_VHF) 147 tune *= 2; 148 149 switch (params->u.ofdm.bandwidth) { 150 case BANDWIDTH_6_MHZ: 151 mt2266_writeregs(priv, mt2266_init_6mhz, 152 sizeof(mt2266_init_6mhz)); 153 break; 154 case BANDWIDTH_7_MHZ: 155 mt2266_writeregs(priv, mt2266_init_7mhz, 156 sizeof(mt2266_init_7mhz)); 157 break; 158 case BANDWIDTH_8_MHZ: 159 default: 160 mt2266_writeregs(priv, mt2266_init_8mhz, 161 sizeof(mt2266_init_8mhz)); 162 break; 163 } 164 165 if (band == MT2266_VHF && priv->band == MT2266_UHF) { 166 dprintk("Switch from UHF to VHF"); 167 mt2266_writereg(priv, 0x05, 0x04); 168 mt2266_writereg(priv, 0x19, 0x61); 169 mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf)); 170 } else if (band == MT2266_UHF && priv->band == MT2266_VHF) { 171 dprintk("Switch from VHF to UHF"); 172 mt2266_writereg(priv, 0x05, 0x52); 173 mt2266_writereg(priv, 0x19, 0x61); 174 mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf)); 175 } 176 msleep(10); 177 178 if (freq <= 495000) 179 lnaband = 0xEE; 180 else if (freq <= 525000) 181 lnaband = 0xDD; 182 else if (freq <= 550000) 183 lnaband = 0xCC; 184 else if (freq <= 580000) 185 lnaband = 0xBB; 186 else if (freq <= 605000) 187 lnaband = 0xAA; 188 else if (freq <= 630000) 189 lnaband = 0x99; 190 else if (freq <= 655000) 191 lnaband = 0x88; 192 else if (freq <= 685000) 193 lnaband = 0x77; 194 else if (freq <= 710000) 195 lnaband = 0x66; 196 else if (freq <= 735000) 197 lnaband = 0x55; 198 else if (freq <= 765000) 199 lnaband = 0x44; 200 else if (freq <= 802000) 201 lnaband = 0x33; 202 else if (freq <= 840000) 203 lnaband = 0x22; 204 else 205 lnaband = 0x11; 206 207 b[0] = REG_TUNE; 208 b[1] = (tune >> 8) & 0x1F; 209 b[2] = tune & 0xFF; 210 b[3] = tune >> 13; 211 mt2266_writeregs(priv,b,4); 212 213 dprintk("set_parms: tune=%d band=%d %s", 214 (int) tune, (int) lnaband, 215 (band == MT2266_UHF) ? "UHF" : "VHF"); 216 dprintk("set_parms: [1..3]: %2x %2x %2x", 217 (int) b[1], (int) b[2], (int)b[3]); 218 219 if (band == MT2266_UHF) { 220 b[0] = 0x05; 221 b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62; 222 b[2] = lnaband; 223 mt2266_writeregs(priv, b, 3); 224 } 225 226 /* Wait for pll lock or timeout */ 227 i = 0; 228 do { 229 mt2266_readreg(priv,REG_LOCK,b); 230 if (b[0] & 0x40) 231 break; 232 msleep(10); 233 i++; 234 } while (i<10); 235 dprintk("Lock when i=%i",(int)i); 236 237 if (band == MT2266_UHF && priv->band == MT2266_VHF) 238 mt2266_writereg(priv, 0x05, 0x62); 239 240 priv->band = band; 241 242 return ret; 243} 244 245static void mt2266_calibrate(struct mt2266_priv *priv) 246{ 247 mt2266_writereg(priv, 0x11, 0x03); 248 mt2266_writereg(priv, 0x11, 0x01); 249 mt2266_writeregs(priv, mt2266_init1, sizeof(mt2266_init1)); 250 mt2266_writeregs(priv, mt2266_init2, sizeof(mt2266_init2)); 251 mt2266_writereg(priv, 0x33, 0x5e); 252 mt2266_writereg(priv, 0x10, 0x10); 253 mt2266_writereg(priv, 0x10, 0x00); 254 mt2266_writeregs(priv, mt2266_init_8mhz, sizeof(mt2266_init_8mhz)); 255 msleep(25); 256 mt2266_writereg(priv, 0x17, 0x6d); 257 mt2266_writereg(priv, 0x1c, 0x00); 258 msleep(75); 259 mt2266_writereg(priv, 0x17, 0x6d); 260 mt2266_writereg(priv, 0x1c, 0xff); 261} 262 263static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency) 264{ 265 struct mt2266_priv *priv = fe->tuner_priv; 266 *frequency = priv->frequency; 267 return 0; 268} 269 270static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth) 271{ 272 struct mt2266_priv *priv = fe->tuner_priv; 273 *bandwidth = priv->bandwidth; 274 return 0; 275} 276 277static int mt2266_init(struct dvb_frontend *fe) 278{ 279 int ret; 280 struct mt2266_priv *priv = fe->tuner_priv; 281 ret = mt2266_writereg(priv, 0x17, 0x6d); 282 if (ret < 0) 283 return ret; 284 ret = mt2266_writereg(priv, 0x1c, 0xff); 285 if (ret < 0) 286 return ret; 287 return 0; 288} 289 290static int mt2266_sleep(struct dvb_frontend *fe) 291{ 292 struct mt2266_priv *priv = fe->tuner_priv; 293 mt2266_writereg(priv, 0x17, 0x6d); 294 mt2266_writereg(priv, 0x1c, 0x00); 295 return 0; 296} 297 298static int mt2266_release(struct dvb_frontend *fe) 299{ 300 kfree(fe->tuner_priv); 301 fe->tuner_priv = NULL; 302 return 0; 303} 304 305static const struct dvb_tuner_ops mt2266_tuner_ops = { 306 .info = { 307 .name = "Microtune MT2266", 308 .frequency_min = 174000000, 309 .frequency_max = 862000000, 310 .frequency_step = 50000, 311 }, 312 .release = mt2266_release, 313 .init = mt2266_init, 314 .sleep = mt2266_sleep, 315 .set_params = mt2266_set_params, 316 .get_frequency = mt2266_get_frequency, 317 .get_bandwidth = mt2266_get_bandwidth 318}; 319 320struct dvb_frontend * mt2266_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2266_config *cfg) 321{ 322 struct mt2266_priv *priv = NULL; 323 u8 id = 0; 324 325 priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL); 326 if (priv == NULL) 327 return NULL; 328 329 priv->cfg = cfg; 330 priv->i2c = i2c; 331 priv->band = MT2266_UHF; 332 333 if (mt2266_readreg(priv, 0, &id)) { 334 kfree(priv); 335 return NULL; 336 } 337 if (id != PART_REV) { 338 kfree(priv); 339 return NULL; 340 } 341 printk(KERN_INFO "MT2266: successfully identified\n"); 342 memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops)); 343 344 fe->tuner_priv = priv; 345 mt2266_calibrate(priv); 346 return fe; 347} 348EXPORT_SYMBOL(mt2266_attach); 349 350MODULE_AUTHOR("Olivier DANET"); 351MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver"); 352MODULE_LICENSE("GPL"); 353