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