drivers/media/tuners/tea5767.c

   1 /*
   2  * For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
   3  * I2C address is allways 0xC0.
   4  *
   5  *
   6  * Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@infradead.org)
   7  * This code is placed under the terms of the GNU General Public License
   8  *
   9  * tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa
  10  * from their contributions on DScaler.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/i2c.h>
  16 #include <linux/slab.h>
  17 #include <linux/delay.h>
  18 #include <linux/videodev2.h>
  19 #include "tuner-i2c.h"
  20 #include "tea5767.h"
  21
  22 static int debug;
  23 module_param(debug, int, 0644);
  24 MODULE_PARM_DESC(debug, "enable verbose debug messages");
  25
  26 /*****************************************************************************/
  27
  28 struct tea5767_priv {
  29         struct tuner_i2c_props  i2c_props;
  30         u32                     frequency;
  31         struct tea5767_ctrl     ctrl;
  32 };
  33
  34 /*****************************************************************************/
  35
  36 /******************************
  37  * Write mode register values *
  38  ******************************/
  39
  40 /* First register */
  41 #define TEA5767_MUTE            0x80    /* Mutes output */
  42 #define TEA5767_SEARCH          0x40    /* Activates station search */
  43 /* Bits 0-5 for divider MSB */
  44
  45 /* Second register */
  46 /* Bits 0-7 for divider LSB */
  47
  48 /* Third register */
  49
  50 /* Station search from botton to up */
  51 #define TEA5767_SEARCH_UP       0x80
  52
  53 /* Searches with ADC output = 10 */
  54 #define TEA5767_SRCH_HIGH_LVL   0x60
  55
  56 /* Searches with ADC output = 10 */
  57 #define TEA5767_SRCH_MID_LVL    0x40
  58
  59 /* Searches with ADC output = 5 */
  60 #define TEA5767_SRCH_LOW_LVL    0x20
  61
  62 /* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */
  63 #define TEA5767_HIGH_LO_INJECT  0x10
  64
  65 /* Disable stereo */
  66 #define TEA5767_MONO            0x08
  67
  68 /* Disable right channel and turns to mono */
  69 #define TEA5767_MUTE_RIGHT      0x04
  70
  71 /* Disable left channel and turns to mono */
  72 #define TEA5767_MUTE_LEFT       0x02
  73
  74 #define TEA5767_PORT1_HIGH      0x01
  75
  76 /* Fourth register */
  77 #define TEA5767_PORT2_HIGH      0x80
  78 /* Chips stops working. Only I2C bus remains on */
  79 #define TEA5767_STDBY           0x40
  80
  81 /* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */
  82 #define TEA5767_JAPAN_BAND      0x20
  83
  84 /* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */
  85 #define TEA5767_XTAL_32768      0x10
  86
  87 /* Cuts weak signals */
  88 #define TEA5767_SOFT_MUTE       0x08
  89
  90 /* Activates high cut control */
  91 #define TEA5767_HIGH_CUT_CTRL   0x04
  92
  93 /* Activates stereo noise control */
  94 #define TEA5767_ST_NOISE_CTL    0x02
  95
  96 /* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */
  97 #define TEA5767_SRCH_IND        0x01
  98
  99 /* Fifth register */
 100
 101 /* By activating, it will use Xtal at 13 MHz as reference for divider */
 102 #define TEA5767_PLLREF_ENABLE   0x80
 103
 104 /* By activating, deemphasis=50, or else, deemphasis of 50us */
 105 #define TEA5767_DEEMPH_75       0X40
 106
 107 /*****************************
 108  * Read mode register values *
 109  *****************************/
 110
 111 /* First register */
 112 #define TEA5767_READY_FLAG_MASK 0x80
 113 #define TEA5767_BAND_LIMIT_MASK 0X40
 114 /* Bits 0-5 for divider MSB after search or preset */
 115
 116 /* Second register */
 117 /* Bits 0-7 for divider LSB after search or preset */
 118
 119 /* Third register */
 120 #define TEA5767_STEREO_MASK     0x80
 121 #define TEA5767_IF_CNTR_MASK    0x7f
 122
 123 /* Fourth register */
 124 #define TEA5767_ADC_LEVEL_MASK  0xf0
 125
 126 /* should be 0 */
 127 #define TEA5767_CHIP_ID_MASK    0x0f
 128
 129 /* Fifth register */
 130 /* Reserved for future extensions */
 131 #define TEA5767_RESERVED_MASK   0xff
 132
 133 /*****************************************************************************/
 134
 135 static void tea5767_status_dump(struct tea5767_priv *priv,
 136                                 unsigned char *buffer)
 137 {
 138         unsigned int div, frq;
 139
 140         if (TEA5767_READY_FLAG_MASK & buffer[0])
 141                 tuner_info("Ready Flag ON\n");
 142         else
 143                 tuner_info("Ready Flag OFF\n");
 144
 145         if (TEA5767_BAND_LIMIT_MASK & buffer[0])
 146                 tuner_info("Tuner at band limit\n");
 147         else
 148                 tuner_info("Tuner not at band limit\n");
 149
 150         div = ((buffer[0] & 0x3f) << 8) | buffer[1];
 151
 152         switch (priv->ctrl.xtal_freq) {
 153         case TEA5767_HIGH_LO_13MHz:
 154                 frq = (div * 50000 - 700000 - 225000) / 4;      /* Freq in KHz */
 155                 break;
 156         case TEA5767_LOW_LO_13MHz:
 157                 frq = (div * 50000 + 700000 + 225000) / 4;      /* Freq in KHz */
 158                 break;
 159         case TEA5767_LOW_LO_32768:
 160                 frq = (div * 32768 + 700000 + 225000) / 4;      /* Freq in KHz */
 161                 break;
 162         case TEA5767_HIGH_LO_32768:
 163         default:
 164                 frq = (div * 32768 - 700000 - 225000) / 4;      /* Freq in KHz */
 165                 break;
 166         }
 167         buffer[0] = (div >> 8) & 0x3f;
 168         buffer[1] = div & 0xff;
 169
 170         tuner_info("Frequency %d.%03d KHz (divider = 0x%04x)\n",
 171                    frq / 1000, frq % 1000, div);
 172
 173         if (TEA5767_STEREO_MASK & buffer[2])
 174                 tuner_info("Stereo\n");
 175         else
 176                 tuner_info("Mono\n");
 177
 178         tuner_info("IF Counter = %d\n", buffer[2] & TEA5767_IF_CNTR_MASK);
 179
 180         tuner_info("ADC Level = %d\n",
 181                    (buffer[3] & TEA5767_ADC_LEVEL_MASK) >> 4);
 182
 183         tuner_info("Chip ID = %d\n", (buffer[3] & TEA5767_CHIP_ID_MASK));
 184
 185         tuner_info("Reserved = 0x%02x\n",
 186                    (buffer[4] & TEA5767_RESERVED_MASK));
 187 }
 188
 189 /* Freq should be specifyed at 62.5 Hz */
 190 static int set_radio_freq(struct dvb_frontend *fe,
 191                           struct analog_parameters *params)
 192 {
 193         struct tea5767_priv *priv = fe->tuner_priv;
 194         unsigned int frq = params->frequency;
 195         unsigned char buffer[5];
 196         unsigned div;
 197         int rc;
 198
 199         tuner_dbg("radio freq = %d.%03d MHz\n", frq/16000,(frq/16)%1000);
 200
 201         buffer[2] = 0;
 202
 203         if (priv->ctrl.port1)
 204                 buffer[2] |= TEA5767_PORT1_HIGH;
 205
 206         if (params->audmode == V4L2_TUNER_MODE_MONO) {
 207                 tuner_dbg("TEA5767 set to mono\n");
 208                 buffer[2] |= TEA5767_MONO;
 209         } else {
 210                 tuner_dbg("TEA5767 set to stereo\n");
 211         }
 212
 213
 214         buffer[3] = 0;
 215
 216         if (priv->ctrl.port2)
 217                 buffer[3] |= TEA5767_PORT2_HIGH;
 218
 219         if (priv->ctrl.high_cut)
 220                 buffer[3] |= TEA5767_HIGH_CUT_CTRL;
 221
 222         if (priv->ctrl.st_noise)
 223                 buffer[3] |= TEA5767_ST_NOISE_CTL;
 224
 225         if (priv->ctrl.soft_mute)
 226                 buffer[3] |= TEA5767_SOFT_MUTE;
 227
 228         if (priv->ctrl.japan_band)
 229                 buffer[3] |= TEA5767_JAPAN_BAND;
 230
 231         buffer[4] = 0;
 232
 233         if (priv->ctrl.deemph_75)
 234                 buffer[4] |= TEA5767_DEEMPH_75;
 235
 236         if (priv->ctrl.pllref)
 237                 buffer[4] |= TEA5767_PLLREF_ENABLE;
 238
 239
 240         /* Rounds freq to next decimal value - for 62.5 KHz step */
 241         /* frq = 20*(frq/16)+radio_frq[frq%16]; */
 242
 243         switch (priv->ctrl.xtal_freq) {
 244         case TEA5767_HIGH_LO_13MHz:
 245                 tuner_dbg("radio HIGH LO inject xtal @ 13 MHz\n");
 246                 buffer[2] |= TEA5767_HIGH_LO_INJECT;
 247                 div = (frq * (4000 / 16) + 700000 + 225000 + 25000) / 50000;
 248                 break;
 249         case TEA5767_LOW_LO_13MHz:
 250                 tuner_dbg("radio LOW LO inject xtal @ 13 MHz\n");
 251
 252                 div = (frq * (4000 / 16) - 700000 - 225000 + 25000) / 50000;
 253                 break;
 254         case TEA5767_LOW_LO_32768:
 255                 tuner_dbg("radio LOW LO inject xtal @ 32,768 MHz\n");
 256                 buffer[3] |= TEA5767_XTAL_32768;
 257                 /* const 700=4000*175 Khz - to adjust freq to right value */
 258                 div = ((frq * (4000 / 16) - 700000 - 225000) + 16384) >> 15;
 259                 break;
 260         case TEA5767_HIGH_LO_32768:
 261         default:
 262                 tuner_dbg("radio HIGH LO inject xtal @ 32,768 MHz\n");
 263
 264                 buffer[2] |= TEA5767_HIGH_LO_INJECT;
 265                 buffer[3] |= TEA5767_XTAL_32768;
 266                 div = ((frq * (4000 / 16) + 700000 + 225000) + 16384) >> 15;
 267                 break;
 268         }
 269         buffer[0] = (div >> 8) & 0x3f;
 270         buffer[1] = div & 0xff;
 271
 272         if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
 273                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 274
 275         if (debug) {
 276                 if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5)))
 277                         tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 278                 else
 279                         tea5767_status_dump(priv, buffer);
 280         }
 281
 282         priv->frequency = frq * 125 / 2;
 283
 284         return 0;
 285 }
 286
 287 static int tea5767_read_status(struct dvb_frontend *fe, char *buffer)
 288 {
 289         struct tea5767_priv *priv = fe->tuner_priv;
 290         int rc;
 291
 292         memset(buffer, 0, 5);
 293         if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5))) {
 294                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 295                 return -EREMOTEIO;
 296         }
 297
 298         return 0;
 299 }
 300
 301 static inline int tea5767_signal(struct dvb_frontend *fe, const char *buffer)
 302 {
 303         struct tea5767_priv *priv = fe->tuner_priv;
 304
 305         int signal = ((buffer[3] & TEA5767_ADC_LEVEL_MASK) << 8);
 306
 307         tuner_dbg("Signal strength: %d\n", signal);
 308
 309         return signal;
 310 }
 311
 312 static inline int tea5767_stereo(struct dvb_frontend *fe, const char *buffer)
 313 {
 314         struct tea5767_priv *priv = fe->tuner_priv;
 315
 316         int stereo = buffer[2] & TEA5767_STEREO_MASK;
 317
 318         tuner_dbg("Radio ST GET = %02x\n", stereo);
 319
 320         return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
 321 }
 322
 323 static int tea5767_get_status(struct dvb_frontend *fe, u32 *status)
 324 {
 325         unsigned char buffer[5];
 326
 327         *status = 0;
 328
 329         if (0 == tea5767_read_status(fe, buffer)) {
 330                 if (tea5767_signal(fe, buffer))
 331                         *status = TUNER_STATUS_LOCKED;
 332                 if (tea5767_stereo(fe, buffer))
 333                         *status |= TUNER_STATUS_STEREO;
 334         }
 335
 336         return 0;
 337 }
 338
 339 static int tea5767_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 340 {
 341         unsigned char buffer[5];
 342
 343         *strength = 0;
 344
 345         if (0 == tea5767_read_status(fe, buffer))
 346                 *strength = tea5767_signal(fe, buffer);
 347
 348         return 0;
 349 }
 350
 351 static int tea5767_standby(struct dvb_frontend *fe)
 352 {
 353         unsigned char buffer[5];
 354         struct tea5767_priv *priv = fe->tuner_priv;
 355         unsigned div, rc;
 356
 357         div = (87500 * 4 + 700 + 225 + 25) / 50; /* Set frequency to 87.5 MHz */
 358         buffer[0] = (div >> 8) & 0x3f;
 359         buffer[1] = div & 0xff;
 360         buffer[2] = TEA5767_PORT1_HIGH;
 361         buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL |
 362                     TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND | TEA5767_STDBY;
 363         buffer[4] = 0;
 364
 365         if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
 366                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 367
 368         return 0;
 369 }
 370
 371 int tea5767_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
 372 {
 373         struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
 374         unsigned char buffer[7] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 375
 376         int rc;
 377
 378         if ((rc = tuner_i2c_xfer_recv(&i2c, buffer, 7))< 5) {
 379                 pr_warn("It is not a TEA5767. Received %i bytes.\n", rc);
 380                 return -EINVAL;
 381         }
 382
 383         /* If all bytes are the same then it's a TV tuner and not a tea5767 */
 384         if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&
 385             buffer[0] == buffer[3] && buffer[0] == buffer[4]) {
 386                 pr_warn("All bytes are equal. It is not a TEA5767\n");
 387                 return -EINVAL;
 388         }
 389
 390         /*  Status bytes:
 391          *  Byte 4: bit 3:1 : CI (Chip Identification) == 0
 392          *          bit 0   : internally set to 0
 393          *  Byte 5: bit 7:0 : == 0
 394          */
 395         if (((buffer[3] & 0x0f) != 0x00) || (buffer[4] != 0x00)) {
 396                 pr_warn("Chip ID is not zero. It is not a TEA5767\n");
 397                 return -EINVAL;
 398         }
 399
 400
 401         return 0;
 402 }
 403
 404 static int tea5767_release(struct dvb_frontend *fe)
 405 {
 406         kfree(fe->tuner_priv);
 407         fe->tuner_priv = NULL;
 408
 409         return 0;
 410 }
 411
 412 static int tea5767_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 413 {
 414         struct tea5767_priv *priv = fe->tuner_priv;
 415         *frequency = priv->frequency;
 416
 417         return 0;
 418 }
 419
 420 static int tea5767_set_config (struct dvb_frontend *fe, void *priv_cfg)
 421 {
 422         struct tea5767_priv *priv = fe->tuner_priv;
 423
 424         memcpy(&priv->ctrl, priv_cfg, sizeof(priv->ctrl));
 425
 426         return 0;
 427 }
 428
 429 static struct dvb_tuner_ops tea5767_tuner_ops = {
 430         .info = {
 431                 .name           = "tea5767", // Philips TEA5767HN FM Radio
 432         },
 433
 434         .set_analog_params = set_radio_freq,
 435         .set_config        = tea5767_set_config,
 436         .sleep             = tea5767_standby,
 437         .release           = tea5767_release,
 438         .get_frequency     = tea5767_get_frequency,
 439         .get_status        = tea5767_get_status,
 440         .get_rf_strength   = tea5767_get_rf_strength,
 441 };
 442
 443 struct dvb_frontend *tea5767_attach(struct dvb_frontend *fe,
 444                                     struct i2c_adapter* i2c_adap,
 445                                     u8 i2c_addr)
 446 {
 447         struct tea5767_priv *priv = NULL;
 448
 449         priv = kzalloc(sizeof(struct tea5767_priv), GFP_KERNEL);
 450         if (priv == NULL)
 451                 return NULL;
 452         fe->tuner_priv = priv;
 453
 454         priv->i2c_props.addr  = i2c_addr;
 455         priv->i2c_props.adap  = i2c_adap;
 456         priv->i2c_props.name  = "tea5767";
 457
 458         priv->ctrl.xtal_freq  = TEA5767_HIGH_LO_32768;
 459         priv->ctrl.port1      = 1;
 460         priv->ctrl.port2      = 1;
 461         priv->ctrl.high_cut   = 1;
 462         priv->ctrl.st_noise   = 1;
 463         priv->ctrl.japan_band = 1;
 464
 465         memcpy(&fe->ops.tuner_ops, &tea5767_tuner_ops,
 466                sizeof(struct dvb_tuner_ops));
 467
 468         tuner_info("type set to %s\n", "Philips TEA5767HN FM Radio");
 469
 470         return fe;
 471 }
 472
 473 EXPORT_SYMBOL_GPL(tea5767_attach);
 474 EXPORT_SYMBOL_GPL(tea5767_autodetection);
 475
 476 MODULE_DESCRIPTION("Philips TEA5767 FM tuner driver");
 477 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 478 MODULE_LICENSE("GPL");