drivers/media/tuners/tea5767.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
   3 // I2C address is always 0xC0.
   4 //
   5 // Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@infradead.org)
   6 //
   7 // tea5767 autodetection thanks to Torsten Seeboth and Atsushi Nakagawa
   8 // from their contributions on DScaler.
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/i2c.h>
  13 #include <linux/slab.h>
  14 #include <linux/delay.h>
  15 #include <linux/videodev2.h>
  16 #include "tuner-i2c.h"
  17 #include "tea5767.h"
  18
  19 static int debug;
  20 module_param(debug, int, 0644);
  21 MODULE_PARM_DESC(debug, "enable verbose debug messages");
  22
  23 /*****************************************************************************/
  24
  25 struct tea5767_priv {
  26         struct tuner_i2c_props  i2c_props;
  27         u32                     frequency;
  28         struct tea5767_ctrl     ctrl;
  29 };
  30
  31 /*****************************************************************************/
  32
  33 /******************************
  34  * Write mode register values *
  35  ******************************/
  36
  37 /* First register */
  38 #define TEA5767_MUTE            0x80    /* Mutes output */
  39 #define TEA5767_SEARCH          0x40    /* Activates station search */
  40 /* Bits 0-5 for divider MSB */
  41
  42 /* Second register */
  43 /* Bits 0-7 for divider LSB */
  44
  45 /* Third register */
  46
  47 /* Station search from botton to up */
  48 #define TEA5767_SEARCH_UP       0x80
  49
  50 /* Searches with ADC output = 10 */
  51 #define TEA5767_SRCH_HIGH_LVL   0x60
  52
  53 /* Searches with ADC output = 10 */
  54 #define TEA5767_SRCH_MID_LVL    0x40
  55
  56 /* Searches with ADC output = 5 */
  57 #define TEA5767_SRCH_LOW_LVL    0x20
  58
  59 /* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */
  60 #define TEA5767_HIGH_LO_INJECT  0x10
  61
  62 /* Disable stereo */
  63 #define TEA5767_MONO            0x08
  64
  65 /* Disable right channel and turns to mono */
  66 #define TEA5767_MUTE_RIGHT      0x04
  67
  68 /* Disable left channel and turns to mono */
  69 #define TEA5767_MUTE_LEFT       0x02
  70
  71 #define TEA5767_PORT1_HIGH      0x01
  72
  73 /* Fourth register */
  74 #define TEA5767_PORT2_HIGH      0x80
  75 /* Chips stops working. Only I2C bus remains on */
  76 #define TEA5767_STDBY           0x40
  77
  78 /* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */
  79 #define TEA5767_JAPAN_BAND      0x20
  80
  81 /* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */
  82 #define TEA5767_XTAL_32768      0x10
  83
  84 /* Cuts weak signals */
  85 #define TEA5767_SOFT_MUTE       0x08
  86
  87 /* Activates high cut control */
  88 #define TEA5767_HIGH_CUT_CTRL   0x04
  89
  90 /* Activates stereo noise control */
  91 #define TEA5767_ST_NOISE_CTL    0x02
  92
  93 /* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */
  94 #define TEA5767_SRCH_IND        0x01
  95
  96 /* Fifth register */
  97
  98 /* By activating, it will use Xtal at 13 MHz as reference for divider */
  99 #define TEA5767_PLLREF_ENABLE   0x80
 100
 101 /* By activating, deemphasis=50, or else, deemphasis of 50us */
 102 #define TEA5767_DEEMPH_75       0X40
 103
 104 /*****************************
 105  * Read mode register values *
 106  *****************************/
 107
 108 /* First register */
 109 #define TEA5767_READY_FLAG_MASK 0x80
 110 #define TEA5767_BAND_LIMIT_MASK 0X40
 111 /* Bits 0-5 for divider MSB after search or preset */
 112
 113 /* Second register */
 114 /* Bits 0-7 for divider LSB after search or preset */
 115
 116 /* Third register */
 117 #define TEA5767_STEREO_MASK     0x80
 118 #define TEA5767_IF_CNTR_MASK    0x7f
 119
 120 /* Fourth register */
 121 #define TEA5767_ADC_LEVEL_MASK  0xf0
 122
 123 /* should be 0 */
 124 #define TEA5767_CHIP_ID_MASK    0x0f
 125
 126 /* Fifth register */
 127 /* Reserved for future extensions */
 128 #define TEA5767_RESERVED_MASK   0xff
 129
 130 /*****************************************************************************/
 131
 132 static void tea5767_status_dump(struct tea5767_priv *priv,
 133                                 unsigned char *buffer)
 134 {
 135         unsigned int div, frq;
 136
 137         if (TEA5767_READY_FLAG_MASK & buffer[0])
 138                 tuner_info("Ready Flag ON\n");
 139         else
 140                 tuner_info("Ready Flag OFF\n");
 141
 142         if (TEA5767_BAND_LIMIT_MASK & buffer[0])
 143                 tuner_info("Tuner at band limit\n");
 144         else
 145                 tuner_info("Tuner not at band limit\n");
 146
 147         div = ((buffer[0] & 0x3f) << 8) | buffer[1];
 148
 149         switch (priv->ctrl.xtal_freq) {
 150         case TEA5767_HIGH_LO_13MHz:
 151                 frq = (div * 50000 - 700000 - 225000) / 4;      /* Freq in KHz */
 152                 break;
 153         case TEA5767_LOW_LO_13MHz:
 154                 frq = (div * 50000 + 700000 + 225000) / 4;      /* Freq in KHz */
 155                 break;
 156         case TEA5767_LOW_LO_32768:
 157                 frq = (div * 32768 + 700000 + 225000) / 4;      /* Freq in KHz */
 158                 break;
 159         case TEA5767_HIGH_LO_32768:
 160         default:
 161                 frq = (div * 32768 - 700000 - 225000) / 4;      /* Freq in KHz */
 162                 break;
 163         }
 164         buffer[0] = (div >> 8) & 0x3f;
 165         buffer[1] = div & 0xff;
 166
 167         tuner_info("Frequency %d.%03d KHz (divider = 0x%04x)\n",
 168                    frq / 1000, frq % 1000, div);
 169
 170         if (TEA5767_STEREO_MASK & buffer[2])
 171                 tuner_info("Stereo\n");
 172         else
 173                 tuner_info("Mono\n");
 174
 175         tuner_info("IF Counter = %d\n", buffer[2] & TEA5767_IF_CNTR_MASK);
 176
 177         tuner_info("ADC Level = %d\n",
 178                    (buffer[3] & TEA5767_ADC_LEVEL_MASK) >> 4);
 179
 180         tuner_info("Chip ID = %d\n", (buffer[3] & TEA5767_CHIP_ID_MASK));
 181
 182         tuner_info("Reserved = 0x%02x\n",
 183                    (buffer[4] & TEA5767_RESERVED_MASK));
 184 }
 185
 186 /* Freq should be specifyed at 62.5 Hz */
 187 static int set_radio_freq(struct dvb_frontend *fe,
 188                           struct analog_parameters *params)
 189 {
 190         struct tea5767_priv *priv = fe->tuner_priv;
 191         unsigned int frq = params->frequency;
 192         unsigned char buffer[5];
 193         unsigned div;
 194         int rc;
 195
 196         tuner_dbg("radio freq = %d.%03d MHz\n", frq/16000,(frq/16)%1000);
 197
 198         buffer[2] = 0;
 199
 200         if (priv->ctrl.port1)
 201                 buffer[2] |= TEA5767_PORT1_HIGH;
 202
 203         if (params->audmode == V4L2_TUNER_MODE_MONO) {
 204                 tuner_dbg("TEA5767 set to mono\n");
 205                 buffer[2] |= TEA5767_MONO;
 206         } else {
 207                 tuner_dbg("TEA5767 set to stereo\n");
 208         }
 209
 210
 211         buffer[3] = 0;
 212
 213         if (priv->ctrl.port2)
 214                 buffer[3] |= TEA5767_PORT2_HIGH;
 215
 216         if (priv->ctrl.high_cut)
 217                 buffer[3] |= TEA5767_HIGH_CUT_CTRL;
 218
 219         if (priv->ctrl.st_noise)
 220                 buffer[3] |= TEA5767_ST_NOISE_CTL;
 221
 222         if (priv->ctrl.soft_mute)
 223                 buffer[3] |= TEA5767_SOFT_MUTE;
 224
 225         if (priv->ctrl.japan_band)
 226                 buffer[3] |= TEA5767_JAPAN_BAND;
 227
 228         buffer[4] = 0;
 229
 230         if (priv->ctrl.deemph_75)
 231                 buffer[4] |= TEA5767_DEEMPH_75;
 232
 233         if (priv->ctrl.pllref)
 234                 buffer[4] |= TEA5767_PLLREF_ENABLE;
 235
 236
 237         /* Rounds freq to next decimal value - for 62.5 KHz step */
 238         /* frq = 20*(frq/16)+radio_frq[frq%16]; */
 239
 240         switch (priv->ctrl.xtal_freq) {
 241         case TEA5767_HIGH_LO_13MHz:
 242                 tuner_dbg("radio HIGH LO inject xtal @ 13 MHz\n");
 243                 buffer[2] |= TEA5767_HIGH_LO_INJECT;
 244                 div = (frq * (4000 / 16) + 700000 + 225000 + 25000) / 50000;
 245                 break;
 246         case TEA5767_LOW_LO_13MHz:
 247                 tuner_dbg("radio LOW LO inject xtal @ 13 MHz\n");
 248
 249                 div = (frq * (4000 / 16) - 700000 - 225000 + 25000) / 50000;
 250                 break;
 251         case TEA5767_LOW_LO_32768:
 252                 tuner_dbg("radio LOW LO inject xtal @ 32,768 MHz\n");
 253                 buffer[3] |= TEA5767_XTAL_32768;
 254                 /* const 700=4000*175 Khz - to adjust freq to right value */
 255                 div = ((frq * (4000 / 16) - 700000 - 225000) + 16384) >> 15;
 256                 break;
 257         case TEA5767_HIGH_LO_32768:
 258         default:
 259                 tuner_dbg("radio HIGH LO inject xtal @ 32,768 MHz\n");
 260
 261                 buffer[2] |= TEA5767_HIGH_LO_INJECT;
 262                 buffer[3] |= TEA5767_XTAL_32768;
 263                 div = ((frq * (4000 / 16) + 700000 + 225000) + 16384) >> 15;
 264                 break;
 265         }
 266         buffer[0] = (div >> 8) & 0x3f;
 267         buffer[1] = div & 0xff;
 268
 269         if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
 270                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 271
 272         if (debug) {
 273                 if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5)))
 274                         tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 275                 else
 276                         tea5767_status_dump(priv, buffer);
 277         }
 278
 279         priv->frequency = frq * 125 / 2;
 280
 281         return 0;
 282 }
 283
 284 static int tea5767_read_status(struct dvb_frontend *fe, char *buffer)
 285 {
 286         struct tea5767_priv *priv = fe->tuner_priv;
 287         int rc;
 288
 289         memset(buffer, 0, 5);
 290         if (5 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 5))) {
 291                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 292                 return -EREMOTEIO;
 293         }
 294
 295         return 0;
 296 }
 297
 298 static inline int tea5767_signal(struct dvb_frontend *fe, const char *buffer)
 299 {
 300         struct tea5767_priv *priv = fe->tuner_priv;
 301
 302         int signal = ((buffer[3] & TEA5767_ADC_LEVEL_MASK) << 8);
 303
 304         tuner_dbg("Signal strength: %d\n", signal);
 305
 306         return signal;
 307 }
 308
 309 static inline int tea5767_stereo(struct dvb_frontend *fe, const char *buffer)
 310 {
 311         struct tea5767_priv *priv = fe->tuner_priv;
 312
 313         int stereo = buffer[2] & TEA5767_STEREO_MASK;
 314
 315         tuner_dbg("Radio ST GET = %02x\n", stereo);
 316
 317         return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
 318 }
 319
 320 static int tea5767_get_status(struct dvb_frontend *fe, u32 *status)
 321 {
 322         unsigned char buffer[5];
 323
 324         *status = 0;
 325
 326         if (0 == tea5767_read_status(fe, buffer)) {
 327                 if (tea5767_signal(fe, buffer))
 328                         *status = TUNER_STATUS_LOCKED;
 329                 if (tea5767_stereo(fe, buffer))
 330                         *status |= TUNER_STATUS_STEREO;
 331         }
 332
 333         return 0;
 334 }
 335
 336 static int tea5767_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 337 {
 338         unsigned char buffer[5];
 339
 340         *strength = 0;
 341
 342         if (0 == tea5767_read_status(fe, buffer))
 343                 *strength = tea5767_signal(fe, buffer);
 344
 345         return 0;
 346 }
 347
 348 static int tea5767_standby(struct dvb_frontend *fe)
 349 {
 350         unsigned char buffer[5];
 351         struct tea5767_priv *priv = fe->tuner_priv;
 352         unsigned div, rc;
 353
 354         div = (87500 * 4 + 700 + 225 + 25) / 50; /* Set frequency to 87.5 MHz */
 355         buffer[0] = (div >> 8) & 0x3f;
 356         buffer[1] = div & 0xff;
 357         buffer[2] = TEA5767_PORT1_HIGH;
 358         buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL |
 359                     TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND | TEA5767_STDBY;
 360         buffer[4] = 0;
 361
 362         if (5 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 5)))
 363                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 364
 365         return 0;
 366 }
 367
 368 int tea5767_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
 369 {
 370         struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
 371         unsigned char buffer[7] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 372
 373         int rc;
 374
 375         if ((rc = tuner_i2c_xfer_recv(&i2c, buffer, 7))< 5) {
 376                 pr_warn("It is not a TEA5767. Received %i bytes.\n", rc);
 377                 return -EINVAL;
 378         }
 379
 380         /* If all bytes are the same then it's a TV tuner and not a tea5767 */
 381         if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&
 382             buffer[0] == buffer[3] && buffer[0] == buffer[4]) {
 383                 pr_warn("All bytes are equal. It is not a TEA5767\n");
 384                 return -EINVAL;
 385         }
 386
 387         /*  Status bytes:
 388          *  Byte 4: bit 3:1 : CI (Chip Identification) == 0
 389          *          bit 0   : internally set to 0
 390          *  Byte 5: bit 7:0 : == 0
 391          */
 392         if (((buffer[3] & 0x0f) != 0x00) || (buffer[4] != 0x00)) {
 393                 pr_warn("Chip ID is not zero. It is not a TEA5767\n");
 394                 return -EINVAL;
 395         }
 396
 397
 398         return 0;
 399 }
 400
 401 static void tea5767_release(struct dvb_frontend *fe)
 402 {
 403         kfree(fe->tuner_priv);
 404         fe->tuner_priv = NULL;
 405 }
 406
 407 static int tea5767_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 408 {
 409         struct tea5767_priv *priv = fe->tuner_priv;
 410         *frequency = priv->frequency;
 411
 412         return 0;
 413 }
 414
 415 static int tea5767_set_config (struct dvb_frontend *fe, void *priv_cfg)
 416 {
 417         struct tea5767_priv *priv = fe->tuner_priv;
 418
 419         memcpy(&priv->ctrl, priv_cfg, sizeof(priv->ctrl));
 420
 421         return 0;
 422 }
 423
 424 static const struct dvb_tuner_ops tea5767_tuner_ops = {
 425         .info = {
 426                 .name           = "tea5767", // Philips TEA5767HN FM Radio
 427         },
 428
 429         .set_analog_params = set_radio_freq,
 430         .set_config        = tea5767_set_config,
 431         .sleep             = tea5767_standby,
 432         .release           = tea5767_release,
 433         .get_frequency     = tea5767_get_frequency,
 434         .get_status        = tea5767_get_status,
 435         .get_rf_strength   = tea5767_get_rf_strength,
 436 };
 437
 438 struct dvb_frontend *tea5767_attach(struct dvb_frontend *fe,
 439                                     struct i2c_adapter* i2c_adap,
 440                                     u8 i2c_addr)
 441 {
 442         struct tea5767_priv *priv = NULL;
 443
 444         priv = kzalloc(sizeof(struct tea5767_priv), GFP_KERNEL);
 445         if (priv == NULL)
 446                 return NULL;
 447         fe->tuner_priv = priv;
 448
 449         priv->i2c_props.addr  = i2c_addr;
 450         priv->i2c_props.adap  = i2c_adap;
 451         priv->i2c_props.name  = "tea5767";
 452
 453         priv->ctrl.xtal_freq  = TEA5767_HIGH_LO_32768;
 454         priv->ctrl.port1      = 1;
 455         priv->ctrl.port2      = 1;
 456         priv->ctrl.high_cut   = 1;
 457         priv->ctrl.st_noise   = 1;
 458         priv->ctrl.japan_band = 1;
 459
 460         memcpy(&fe->ops.tuner_ops, &tea5767_tuner_ops,
 461                sizeof(struct dvb_tuner_ops));
 462
 463         tuner_info("type set to %s\n", "Philips TEA5767HN FM Radio");
 464
 465         return fe;
 466 }
 467
 468 EXPORT_SYMBOL_GPL(tea5767_attach);
 469 EXPORT_SYMBOL_GPL(tea5767_autodetection);
 470
 471 MODULE_DESCRIPTION("Philips TEA5767 FM tuner driver");
 472 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 473 MODULE_LICENSE("GPL v2");