drivers/media/tuners/mt2266.c

   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 <media/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
  36 struct 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
  50 static int debug;
  51 module_param(debug, int, 0644);
  52 MODULE_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
  57 static 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 = &reg, .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
  71 static 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
  85 static 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
  98 static u8 mt2266_init1[] = { REG_TUNE, 0x00, 0x00, 0x28,
  99                                  0x00, 0x52, 0x99, 0x3f };
 100
 101 static 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
 108 static u8 mt2266_init_8mhz[] = { REG_BANDWIDTH, 0x22, 0x22, 0x22, 0x22,
 109                                                 0x22, 0x22, 0x22, 0x22 };
 110
 111 static u8 mt2266_init_7mhz[] = { REG_BANDWIDTH, 0x32, 0x32, 0x32, 0x32,
 112                                                 0x32, 0x32, 0x32, 0x32 };
 113
 114 static u8 mt2266_init_6mhz[] = { REG_BANDWIDTH, 0xa7, 0xa7, 0xa7, 0xa7,
 115                                                 0xa7, 0xa7, 0xa7, 0xa7 };
 116
 117 static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64,
 118                            0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 };
 119
 120 static 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
 125 static int mt2266_set_params(struct dvb_frontend *fe)
 126 {
 127         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 128         struct mt2266_priv *priv;
 129         int ret=0;
 130         u32 freq;
 131         u32 tune;
 132         u8  lnaband;
 133         u8  b[10];
 134         int i;
 135         u8 band;
 136
 137         priv = fe->tuner_priv;
 138
 139         freq = priv->frequency / 1000; /* Hz -> kHz */
 140         if (freq < 470000 && freq > 230000)
 141                 return -EINVAL; /* Gap between VHF and UHF bands */
 142
 143         priv->frequency = c->frequency;
 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 (c->bandwidth_hz) {
 150         case 6000000:
 151                 mt2266_writeregs(priv, mt2266_init_6mhz,
 152                                  sizeof(mt2266_init_6mhz));
 153                 break;
 154         case 8000000:
 155                 mt2266_writeregs(priv, mt2266_init_8mhz,
 156                                  sizeof(mt2266_init_8mhz));
 157                 break;
 158         case 7000000:
 159         default:
 160                 mt2266_writeregs(priv, mt2266_init_7mhz,
 161                                  sizeof(mt2266_init_7mhz));
 162                 break;
 163         }
 164         priv->bandwidth = c->bandwidth_hz;
 165
 166         if (band == MT2266_VHF && priv->band == MT2266_UHF) {
 167                 dprintk("Switch from UHF to VHF");
 168                 mt2266_writereg(priv, 0x05, 0x04);
 169                 mt2266_writereg(priv, 0x19, 0x61);
 170                 mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf));
 171         } else if (band == MT2266_UHF && priv->band == MT2266_VHF) {
 172                 dprintk("Switch from VHF to UHF");
 173                 mt2266_writereg(priv, 0x05, 0x52);
 174                 mt2266_writereg(priv, 0x19, 0x61);
 175                 mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf));
 176         }
 177         msleep(10);
 178
 179         if (freq <= 495000)
 180                 lnaband = 0xEE;
 181         else if (freq <= 525000)
 182                 lnaband = 0xDD;
 183         else if (freq <= 550000)
 184                 lnaband = 0xCC;
 185         else if (freq <= 580000)
 186                 lnaband = 0xBB;
 187         else if (freq <= 605000)
 188                 lnaband = 0xAA;
 189         else if (freq <= 630000)
 190                 lnaband = 0x99;
 191         else if (freq <= 655000)
 192                 lnaband = 0x88;
 193         else if (freq <= 685000)
 194                 lnaband = 0x77;
 195         else if (freq <= 710000)
 196                 lnaband = 0x66;
 197         else if (freq <= 735000)
 198                 lnaband = 0x55;
 199         else if (freq <= 765000)
 200                 lnaband = 0x44;
 201         else if (freq <= 802000)
 202                 lnaband = 0x33;
 203         else if (freq <= 840000)
 204                 lnaband = 0x22;
 205         else
 206                 lnaband = 0x11;
 207
 208         b[0] = REG_TUNE;
 209         b[1] = (tune >> 8) & 0x1F;
 210         b[2] = tune & 0xFF;
 211         b[3] = tune >> 13;
 212         mt2266_writeregs(priv,b,4);
 213
 214         dprintk("set_parms: tune=%d band=%d %s",
 215                 (int) tune, (int) lnaband,
 216                 (band == MT2266_UHF) ? "UHF" : "VHF");
 217         dprintk("set_parms: [1..3]: %2x %2x %2x",
 218                 (int) b[1], (int) b[2], (int)b[3]);
 219
 220         if (band == MT2266_UHF) {
 221                 b[0] = 0x05;
 222                 b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62;
 223                 b[2] = lnaband;
 224                 mt2266_writeregs(priv, b, 3);
 225         }
 226
 227         /* Wait for pll lock or timeout */
 228         i = 0;
 229         do {
 230                 mt2266_readreg(priv,REG_LOCK,b);
 231                 if (b[0] & 0x40)
 232                         break;
 233                 msleep(10);
 234                 i++;
 235         } while (i<10);
 236         dprintk("Lock when i=%i",(int)i);
 237
 238         if (band == MT2266_UHF && priv->band == MT2266_VHF)
 239                 mt2266_writereg(priv, 0x05, 0x62);
 240
 241         priv->band = band;
 242
 243         return ret;
 244 }
 245
 246 static void mt2266_calibrate(struct mt2266_priv *priv)
 247 {
 248         mt2266_writereg(priv, 0x11, 0x03);
 249         mt2266_writereg(priv, 0x11, 0x01);
 250         mt2266_writeregs(priv, mt2266_init1, sizeof(mt2266_init1));
 251         mt2266_writeregs(priv, mt2266_init2, sizeof(mt2266_init2));
 252         mt2266_writereg(priv, 0x33, 0x5e);
 253         mt2266_writereg(priv, 0x10, 0x10);
 254         mt2266_writereg(priv, 0x10, 0x00);
 255         mt2266_writeregs(priv, mt2266_init_8mhz, sizeof(mt2266_init_8mhz));
 256         msleep(25);
 257         mt2266_writereg(priv, 0x17, 0x6d);
 258         mt2266_writereg(priv, 0x1c, 0x00);
 259         msleep(75);
 260         mt2266_writereg(priv, 0x17, 0x6d);
 261         mt2266_writereg(priv, 0x1c, 0xff);
 262 }
 263
 264 static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 265 {
 266         struct mt2266_priv *priv = fe->tuner_priv;
 267         *frequency = priv->frequency;
 268         return 0;
 269 }
 270
 271 static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 272 {
 273         struct mt2266_priv *priv = fe->tuner_priv;
 274         *bandwidth = priv->bandwidth;
 275         return 0;
 276 }
 277
 278 static int mt2266_init(struct dvb_frontend *fe)
 279 {
 280         int ret;
 281         struct mt2266_priv *priv = fe->tuner_priv;
 282         ret = mt2266_writereg(priv, 0x17, 0x6d);
 283         if (ret < 0)
 284                 return ret;
 285         ret = mt2266_writereg(priv, 0x1c, 0xff);
 286         if (ret < 0)
 287                 return ret;
 288         return 0;
 289 }
 290
 291 static int mt2266_sleep(struct dvb_frontend *fe)
 292 {
 293         struct mt2266_priv *priv = fe->tuner_priv;
 294         mt2266_writereg(priv, 0x17, 0x6d);
 295         mt2266_writereg(priv, 0x1c, 0x00);
 296         return 0;
 297 }
 298
 299 static void mt2266_release(struct dvb_frontend *fe)
 300 {
 301         kfree(fe->tuner_priv);
 302         fe->tuner_priv = NULL;
 303 }
 304
 305 static const struct dvb_tuner_ops mt2266_tuner_ops = {
 306         .info = {
 307                 .name              = "Microtune MT2266",
 308                 .frequency_min_hz  = 174 * MHz,
 309                 .frequency_max_hz  = 862 * MHz,
 310                 .frequency_step_hz =  50 * kHz,
 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
 320 struct 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 }
 348 EXPORT_SYMBOL(mt2266_attach);
 349
 350 MODULE_AUTHOR("Olivier DANET");
 351 MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");
 352 MODULE_LICENSE("GPL");