drivers/media/video/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@brturbo.com.br)
   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 #include <linux/i2c.h>
  14 #include <linux/videodev.h>
  15 #include <linux/delay.h>
  16 #include <media/tuner.h>
  17
  18 #define PREFIX "TEA5767 "
  19
  20 /* from tuner-core.c */
  21 extern int debug;
  22
  23 /*****************************************************************************/
  24
  25 /******************************
  26  * Write mode register values *
  27  ******************************/
  28
  29 /* First register */
  30 #define TEA5767_MUTE            0x80    /* Mutes output */
  31 #define TEA5767_SEARCH          0x40    /* Activates station search */
  32 /* Bits 0-5 for divider MSB */
  33
  34 /* Second register */
  35 /* Bits 0-7 for divider LSB */
  36
  37 /* Third register */
  38
  39 /* Station search from botton to up */
  40 #define TEA5767_SEARCH_UP       0x80
  41
  42 /* Searches with ADC output = 10 */
  43 #define TEA5767_SRCH_HIGH_LVL   0x60
  44
  45 /* Searches with ADC output = 10 */
  46 #define TEA5767_SRCH_MID_LVL    0x40
  47
  48 /* Searches with ADC output = 5 */
  49 #define TEA5767_SRCH_LOW_LVL    0x20
  50
  51 /* if on, div=4*(Frf+Fif)/Fref otherwise, div=4*(Frf-Fif)/Freq) */
  52 #define TEA5767_HIGH_LO_INJECT  0x10
  53
  54 /* Disable stereo */
  55 #define TEA5767_MONO            0x08
  56
  57 /* Disable right channel and turns to mono */
  58 #define TEA5767_MUTE_RIGHT      0x04
  59
  60 /* Disable left channel and turns to mono */
  61 #define TEA5767_MUTE_LEFT       0x02
  62
  63 #define TEA5767_PORT1_HIGH      0x01
  64
  65 /* Forth register */
  66 #define TEA5767_PORT2_HIGH      0x80
  67 /* Chips stops working. Only I2C bus remains on */
  68 #define TEA5767_STDBY           0x40
  69
  70 /* Japan freq (76-108 MHz. If disabled, 87.5-108 MHz */
  71 #define TEA5767_JAPAN_BAND      0x20
  72
  73 /* Unselected means 32.768 KHz freq as reference. Otherwise Xtal at 13 MHz */
  74 #define TEA5767_XTAL_32768      0x10
  75
  76 /* Cuts weak signals */
  77 #define TEA5767_SOFT_MUTE       0x08
  78
  79 /* Activates high cut control */
  80 #define TEA5767_HIGH_CUT_CTRL   0x04
  81
  82 /* Activates stereo noise control */
  83 #define TEA5767_ST_NOISE_CTL    0x02
  84
  85 /* If activate PORT 1 indicates SEARCH or else it is used as PORT1 */
  86 #define TEA5767_SRCH_IND        0x01
  87
  88 /* Fiveth register */
  89
  90 /* By activating, it will use Xtal at 13 MHz as reference for divider */
  91 #define TEA5767_PLLREF_ENABLE   0x80
  92
  93 /* By activating, deemphasis=50, or else, deemphasis of 50us */
  94 #define TEA5767_DEEMPH_75       0X40
  95
  96 /*****************************
  97  * Read mode register values *
  98  *****************************/
  99
 100 /* First register */
 101 #define TEA5767_READY_FLAG_MASK 0x80
 102 #define TEA5767_BAND_LIMIT_MASK 0X40
 103 /* Bits 0-5 for divider MSB after search or preset */
 104
 105 /* Second register */
 106 /* Bits 0-7 for divider LSB after search or preset */
 107
 108 /* Third register */
 109 #define TEA5767_STEREO_MASK     0x80
 110 #define TEA5767_IF_CNTR_MASK    0x7f
 111
 112 /* Four register */
 113 #define TEA5767_ADC_LEVEL_MASK  0xf0
 114
 115 /* should be 0 */
 116 #define TEA5767_CHIP_ID_MASK    0x0f
 117
 118 /* Fiveth register */
 119 /* Reserved for future extensions */
 120 #define TEA5767_RESERVED_MASK   0xff
 121
 122 enum tea5767_xtal_freq {
 123         TEA5767_LOW_LO_32768    = 0,
 124         TEA5767_HIGH_LO_32768   = 1,
 125         TEA5767_LOW_LO_13MHz    = 2,
 126         TEA5767_HIGH_LO_13MHz   = 3,
 127 };
 128
 129
 130 /*****************************************************************************/
 131
 132 static void set_tv_freq(struct i2c_client *c, unsigned int freq)
 133 {
 134         struct tuner *t = i2c_get_clientdata(c);
 135
 136         tuner_warn("This tuner doesn't support TV freq.\n");
 137 }
 138
 139 static void tea5767_status_dump(unsigned char *buffer)
 140 {
 141         unsigned int div, frq;
 142
 143         if (TEA5767_READY_FLAG_MASK & buffer[0])
 144                 printk(PREFIX "Ready Flag ON\n");
 145         else
 146                 printk(PREFIX "Ready Flag OFF\n");
 147
 148         if (TEA5767_BAND_LIMIT_MASK & buffer[0])
 149                 printk(PREFIX "Tuner at band limit\n");
 150         else
 151                 printk(PREFIX "Tuner not at band limit\n");
 152
 153         div = ((buffer[0] & 0x3f) << 8) | buffer[1];
 154
 155         switch (TEA5767_HIGH_LO_32768) {
 156         case TEA5767_HIGH_LO_13MHz:
 157                 frq = (div * 50000 - 700000 - 225000) / 4;      /* Freq in KHz */
 158                 break;
 159         case TEA5767_LOW_LO_13MHz:
 160                 frq = (div * 50000 + 700000 + 225000) / 4;      /* Freq in KHz */
 161                 break;
 162         case TEA5767_LOW_LO_32768:
 163                 frq = (div * 32768 + 700000 + 225000) / 4;      /* Freq in KHz */
 164                 break;
 165         case TEA5767_HIGH_LO_32768:
 166         default:
 167                 frq = (div * 32768 - 700000 - 225000) / 4;      /* Freq in KHz */
 168                 break;
 169         }
 170         buffer[0] = (div >> 8) & 0x3f;
 171         buffer[1] = div & 0xff;
 172
 173         printk(PREFIX "Frequency %d.%03d KHz (divider = 0x%04x)\n",
 174                frq / 1000, frq % 1000, div);
 175
 176         if (TEA5767_STEREO_MASK & buffer[2])
 177                 printk(PREFIX "Stereo\n");
 178         else
 179                 printk(PREFIX "Mono\n");
 180
 181         printk(PREFIX "IF Counter = %d\n", buffer[2] & TEA5767_IF_CNTR_MASK);
 182
 183         printk(PREFIX "ADC Level = %d\n",
 184                (buffer[3] & TEA5767_ADC_LEVEL_MASK) >> 4);
 185
 186         printk(PREFIX "Chip ID = %d\n", (buffer[3] & TEA5767_CHIP_ID_MASK));
 187
 188         printk(PREFIX "Reserved = 0x%02x\n",
 189                (buffer[4] & TEA5767_RESERVED_MASK));
 190 }
 191
 192 /* Freq should be specifyed at 62.5 Hz */
 193 static void set_radio_freq(struct i2c_client *c, unsigned int frq)
 194 {
 195         struct tuner *t = i2c_get_clientdata(c);
 196         unsigned char buffer[5];
 197         unsigned div;
 198         int rc;
 199
 200         tuner_dbg (PREFIX "radio freq = %d.%03d MHz\n", frq/16000,(frq/16)%1000);
 201
 202         /* Rounds freq to next decimal value - for 62.5 KHz step */
 203         /* frq = 20*(frq/16)+radio_frq[frq%16]; */
 204
 205         buffer[2] = TEA5767_PORT1_HIGH;
 206         buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL |
 207                     TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND;
 208         buffer[4] = 0;
 209
 210         if (t->audmode == V4L2_TUNER_MODE_MONO) {
 211                 tuner_dbg("TEA5767 set to mono\n");
 212                 buffer[2] |= TEA5767_MONO;
 213         } else {
 214                 tuner_dbg("TEA5767 set to stereo\n");
 215         }
 216
 217         /* Should be replaced */
 218         switch (TEA5767_HIGH_LO_32768) {
 219         case TEA5767_HIGH_LO_13MHz:
 220                 tuner_dbg ("TEA5767 radio HIGH LO inject xtal @ 13 MHz\n");
 221                 buffer[2] |= TEA5767_HIGH_LO_INJECT;
 222                 buffer[4] |= TEA5767_PLLREF_ENABLE;
 223                 div = (frq * 4000 / 16 + 700000 + 225000 + 25000) / 50000;
 224                 break;
 225         case TEA5767_LOW_LO_13MHz:
 226                 tuner_dbg ("TEA5767 radio LOW LO inject xtal @ 13 MHz\n");
 227
 228                 buffer[4] |= TEA5767_PLLREF_ENABLE;
 229                 div = (frq * 4000 / 16 - 700000 - 225000 + 25000) / 50000;
 230                 break;
 231         case TEA5767_LOW_LO_32768:
 232                 tuner_dbg ("TEA5767 radio LOW LO inject xtal @ 32,768 MHz\n");
 233                 buffer[3] |= TEA5767_XTAL_32768;
 234                 /* const 700=4000*175 Khz - to adjust freq to right value */
 235                 div = ((frq * 4000 / 16 - 700000 - 225000) + 16384) >> 15;
 236                 break;
 237         case TEA5767_HIGH_LO_32768:
 238         default:
 239                 tuner_dbg ("TEA5767 radio HIGH LO inject xtal @ 32,768 MHz\n");
 240
 241                 buffer[2] |= TEA5767_HIGH_LO_INJECT;
 242                 buffer[3] |= TEA5767_XTAL_32768;
 243                 div = ((frq * (4000 / 16) + 700000 + 225000) + 16384) >> 15;
 244                 break;
 245         }
 246         buffer[0] = (div >> 8) & 0x3f;
 247         buffer[1] = div & 0xff;
 248
 249         if (5 != (rc = i2c_master_send(c, buffer, 5)))
 250                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 251
 252         if (debug) {
 253                 if (5 != (rc = i2c_master_recv(c, buffer, 5)))
 254                         tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 255                 else
 256                         tea5767_status_dump(buffer);
 257         }
 258 }
 259
 260 static int tea5767_signal(struct i2c_client *c)
 261 {
 262         unsigned char buffer[5];
 263         int rc;
 264         struct tuner *t = i2c_get_clientdata(c);
 265
 266         memset(buffer, 0, sizeof(buffer));
 267         if (5 != (rc = i2c_master_recv(c, buffer, 5)))
 268                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 269
 270         return ((buffer[3] & TEA5767_ADC_LEVEL_MASK) << 8);
 271 }
 272
 273 static int tea5767_stereo(struct i2c_client *c)
 274 {
 275         unsigned char buffer[5];
 276         int rc;
 277         struct tuner *t = i2c_get_clientdata(c);
 278
 279         memset(buffer, 0, sizeof(buffer));
 280         if (5 != (rc = i2c_master_recv(c, buffer, 5)))
 281                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 282
 283         rc = buffer[2] & TEA5767_STEREO_MASK;
 284
 285         tuner_dbg("TEA5767 radio ST GET = %02x\n", rc);
 286
 287         return ((buffer[2] & TEA5767_STEREO_MASK) ? V4L2_TUNER_SUB_STEREO : 0);
 288 }
 289
 290 static void tea5767_standby(struct i2c_client *c)
 291 {
 292         unsigned char buffer[5];
 293         struct tuner *t = i2c_get_clientdata(c);
 294         unsigned div, rc;
 295
 296         div = (87500 * 4 + 700 + 225 + 25) / 50; /* Set frequency to 87.5 MHz */
 297         buffer[0] = (div >> 8) & 0x3f;
 298         buffer[1] = div & 0xff;
 299         buffer[2] = TEA5767_PORT1_HIGH;
 300         buffer[3] = TEA5767_PORT2_HIGH | TEA5767_HIGH_CUT_CTRL |
 301                     TEA5767_ST_NOISE_CTL | TEA5767_JAPAN_BAND | TEA5767_STDBY;
 302         buffer[4] = 0;
 303
 304         if (5 != (rc = i2c_master_send(c, buffer, 5)))
 305                 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
 306 }
 307
 308 int tea5767_autodetection(struct i2c_client *c)
 309 {
 310         unsigned char buffer[7] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 311         int rc;
 312         struct tuner *t = i2c_get_clientdata(c);
 313
 314         if ((rc = i2c_master_recv(c, buffer, 7))< 5) {
 315                 tuner_warn("It is not a TEA5767. Received %i bytes.\n", rc);
 316                 return EINVAL;
 317         }
 318
 319         /* If all bytes are the same then it's a TV tuner and not a tea5767 */
 320         if (buffer[0] == buffer[1] && buffer[0] == buffer[2] &&
 321             buffer[0] == buffer[3] && buffer[0] == buffer[4]) {
 322                 tuner_warn("All bytes are equal. It is not a TEA5767\n");
 323                 return EINVAL;
 324         }
 325
 326         /*  Status bytes:
 327          *  Byte 4: bit 3:1 : CI (Chip Identification) == 0
 328          *          bit 0   : internally set to 0
 329          *  Byte 5: bit 7:0 : == 0
 330          */
 331         if (((buffer[3] & 0x0f) != 0x00) || (buffer[4] != 0x00)) {
 332                 tuner_warn("Chip ID is not zero. It is not a TEA5767\n");
 333                 return EINVAL;
 334         }
 335
 336         /* It seems that tea5767 returns 0xff after the 5th byte */
 337         if ((buffer[5] != 0xff) || (buffer[6] != 0xff)) {
 338                 tuner_warn("Returned more than 5 bytes. It is not a TEA5767\n");
 339                 return EINVAL;
 340         }
 341
 342         tuner_warn("TEA5767 detected.\n");
 343         return 0;
 344 }
 345
 346 int tea5767_tuner_init(struct i2c_client *c)
 347 {
 348         struct tuner *t = i2c_get_clientdata(c);
 349
 350         tuner_info("type set to %d (%s)\n", t->type, "Philips TEA5767HN FM Radio");
 351         strlcpy(c->name, "tea5767", sizeof(c->name));
 352
 353         t->tv_freq = set_tv_freq;
 354         t->radio_freq = set_radio_freq;
 355         t->has_signal = tea5767_signal;
 356         t->is_stereo = tea5767_stereo;
 357         t->standby = tea5767_standby;
 358
 359         return (0);
 360 }