drivers/media/video/tda7432.c

   1 /*
   2  * For the STS-Thompson TDA7432 audio processor chip
   3  *
   4  * Handles audio functions: volume, balance, tone, loudness
   5  * This driver will not complain if used with any
   6  * other i2c device with the same address.
   7  *
   8  * Muting and tone control by Jonathan Isom <jisom@ematic.com>
   9  *
  10  * Copyright (c) 2000 Eric Sandeen <eric_sandeen@bigfoot.com>
  11  * Copyright (c) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
  12  * This code is placed under the terms of the GNU General Public License
  13  * Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
  14  * Which was based on tda8425.c by Greg Alexander (c) 1998
  15  *
  16  * OPTIONS:
  17  * debug    - set to 1 if you'd like to see debug messages
  18  *            set to 2 if you'd like to be inundated with debug messages
  19  *
  20  * loudness - set between 0 and 15 for varying degrees of loudness effect
  21  *
  22  * maxvol   - set maximium volume to +20db (1), default is 0db(0)
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/string.h>
  29 #include <linux/timer.h>
  30 #include <linux/delay.h>
  31 #include <linux/errno.h>
  32 #include <linux/slab.h>
  33 #include <linux/videodev2.h>
  34 #include <linux/i2c.h>
  35
  36 #include <media/v4l2-device.h>
  37 #include <media/v4l2-ioctl.h>
  38 #include <media/i2c-addr.h>
  39
  40 #ifndef VIDEO_AUDIO_BALANCE
  41 # define VIDEO_AUDIO_BALANCE 32
  42 #endif
  43
  44 MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
  45 MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
  46 MODULE_LICENSE("GPL");
  47
  48 static int maxvol;
  49 static int loudness; /* disable loudness by default */
  50 static int debug;        /* insmod parameter */
  51 module_param(debug, int, S_IRUGO | S_IWUSR);
  52 module_param(loudness, int, S_IRUGO);
  53 MODULE_PARM_DESC(maxvol,"Set maximium volume to +20db (0), default is 0db(1)");
  54 module_param(maxvol, int, S_IRUGO | S_IWUSR);
  55
  56
  57
  58 /* Structure of address and subaddresses for the tda7432 */
  59
  60 struct tda7432 {
  61         struct v4l2_subdev sd;
  62         int addr;
  63         int input;
  64         int volume;
  65         int muted;
  66         int bass, treble;
  67         int lf, lr, rf, rr;
  68         int loud;
  69 };
  70
  71 static inline struct tda7432 *to_state(struct v4l2_subdev *sd)
  72 {
  73         return container_of(sd, struct tda7432, sd);
  74 }
  75
  76 /* The TDA7432 is made by STS-Thompson
  77  * http://www.st.com
  78  * http://us.st.com/stonline/books/pdf/docs/4056.pdf
  79  *
  80  * TDA7432: I2C-bus controlled basic audio processor
  81  *
  82  * The TDA7432 controls basic audio functions like volume, balance,
  83  * and tone control (including loudness).  It also has four channel
  84  * output (for front and rear).  Since most vidcap cards probably
  85  * don't have 4 channel output, this driver will set front & rear
  86  * together (no independent control).
  87  */
  88
  89                 /* Subaddresses for TDA7432 */
  90
  91 #define TDA7432_IN      0x00 /* Input select                 */
  92 #define TDA7432_VL      0x01 /* Volume                       */
  93 #define TDA7432_TN      0x02 /* Bass, Treble (Tone)          */
  94 #define TDA7432_LF      0x03 /* Attenuation LF (Left Front)  */
  95 #define TDA7432_LR      0x04 /* Attenuation LR (Left Rear)   */
  96 #define TDA7432_RF      0x05 /* Attenuation RF (Right Front) */
  97 #define TDA7432_RR      0x06 /* Attenuation RR (Right Rear)  */
  98 #define TDA7432_LD      0x07 /* Loudness                     */
  99
 100
 101                 /* Masks for bits in TDA7432 subaddresses */
 102
 103 /* Many of these not used - just for documentation */
 104
 105 /* Subaddress 0x00 - Input selection and bass control */
 106
 107 /* Bits 0,1,2 control input:
 108  * 0x00 - Stereo input
 109  * 0x02 - Mono input
 110  * 0x03 - Mute  (Using Attenuators Plays better with modules)
 111  * Mono probably isn't used - I'm guessing only the stereo
 112  * input is connected on most cards, so we'll set it to stereo.
 113  *
 114  * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
 115  * Bit 4 controls bass range: 0/1 is extended/standard bass range
 116  *
 117  * Highest 3 bits not used
 118  */
 119
 120 #define TDA7432_STEREO_IN       0
 121 #define TDA7432_MONO_IN         2       /* Probably won't be used */
 122 #define TDA7432_BASS_SYM        1 << 3
 123 #define TDA7432_BASS_NORM       1 << 4
 124
 125 /* Subaddress 0x01 - Volume */
 126
 127 /* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
 128  * Recommended maximum is +20 dB
 129  *
 130  * +32dB: 0x00
 131  * +20dB: 0x0c
 132  *   0dB: 0x20
 133  * -79dB: 0x6f
 134  *
 135  * MSB (bit 7) controls loudness: 1/0 is loudness on/off
 136  */
 137
 138 #define TDA7432_VOL_0DB         0x20
 139 #define TDA7432_LD_ON           1 << 7
 140
 141
 142 /* Subaddress 0x02 - Tone control */
 143
 144 /* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
 145  * 0x0 is 14dB, 0x7 is 0dB
 146  *
 147  * Bit 3 controls treble attenuation/gain (sign)
 148  * 1 = gain (+)
 149  * 0 = attenuation (-)
 150  *
 151  * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
 152  * (This is only true for normal base range, set in 0x00)
 153  * 0x0 << 4 is 14dB, 0x7 is 0dB
 154  *
 155  * Bit 7 controls bass attenuation/gain (sign)
 156  * 1 << 7 = gain (+)
 157  * 0 << 7 = attenuation (-)
 158  *
 159  * Example:
 160  * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
 161  */
 162
 163 #define TDA7432_TREBLE_0DB              0xf
 164 #define TDA7432_TREBLE                  7
 165 #define TDA7432_TREBLE_GAIN             1 << 3
 166 #define TDA7432_BASS_0DB                0xf
 167 #define TDA7432_BASS                    7 << 4
 168 #define TDA7432_BASS_GAIN               1 << 7
 169
 170
 171 /* Subaddress 0x03 - Left  Front attenuation */
 172 /* Subaddress 0x04 - Left  Rear  attenuation */
 173 /* Subaddress 0x05 - Right Front attenuation */
 174 /* Subaddress 0x06 - Right Rear  attenuation */
 175
 176 /* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
 177  * in 1.5dB steps.
 178  *
 179  * 0x00 is     0dB
 180  * 0x1f is -37.5dB
 181  *
 182  * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
 183  * We'll use the mute on the input, though (above)
 184  * Bits 6,7 unused
 185  */
 186
 187 #define TDA7432_ATTEN_0DB       0x00
 188 #define TDA7432_MUTE        0x1 << 5
 189
 190
 191 /* Subaddress 0x07 - Loudness Control */
 192
 193 /* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
 194  * when bit 4 is NOT set
 195  *
 196  * 0x0 is   0dB
 197  * 0xf is -15dB
 198  *
 199  * If bit 4 is set, then there is a flat attenuation according to
 200  * the lower 4 bits, as above.
 201  *
 202  * Bits 5,6,7 unused
 203  */
 204
 205
 206
 207 /* Begin code */
 208
 209 static int tda7432_write(struct v4l2_subdev *sd, int subaddr, int val)
 210 {
 211         struct i2c_client *client = v4l2_get_subdevdata(sd);
 212         unsigned char buffer[2];
 213
 214         v4l2_dbg(2, debug, sd, "In tda7432_write\n");
 215         v4l2_dbg(1, debug, sd, "Writing %d 0x%x\n", subaddr, val);
 216         buffer[0] = subaddr;
 217         buffer[1] = val;
 218         if (2 != i2c_master_send(client, buffer, 2)) {
 219                 v4l2_err(sd, "I/O error, trying (write %d 0x%x)\n",
 220                        subaddr, val);
 221                 return -1;
 222         }
 223         return 0;
 224 }
 225
 226 static int tda7432_set(struct v4l2_subdev *sd)
 227 {
 228         struct i2c_client *client = v4l2_get_subdevdata(sd);
 229         struct tda7432 *t = to_state(sd);
 230         unsigned char buf[16];
 231
 232         v4l2_dbg(1, debug, sd,
 233                 "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
 234                 t->input, t->volume, t->bass, t->treble, t->lf, t->lr,
 235                 t->rf, t->rr, t->loud);
 236         buf[0]  = TDA7432_IN;
 237         buf[1]  = t->input;
 238         buf[2]  = t->volume;
 239         buf[3]  = t->bass;
 240         buf[4]  = t->treble;
 241         buf[5]  = t->lf;
 242         buf[6]  = t->lr;
 243         buf[7]  = t->rf;
 244         buf[8]  = t->rr;
 245         buf[9]  = t->loud;
 246         if (10 != i2c_master_send(client, buf, 10)) {
 247                 v4l2_err(sd, "I/O error, trying tda7432_set\n");
 248                 return -1;
 249         }
 250
 251         return 0;
 252 }
 253
 254 static void do_tda7432_init(struct v4l2_subdev *sd)
 255 {
 256         struct tda7432 *t = to_state(sd);
 257
 258         v4l2_dbg(2, debug, sd, "In tda7432_init\n");
 259
 260         t->input  = TDA7432_STEREO_IN |  /* Main (stereo) input   */
 261                     TDA7432_BASS_SYM  |  /* Symmetric bass cut    */
 262                     TDA7432_BASS_NORM;   /* Normal bass range     */
 263         t->volume =  0x3b ;                              /* -27dB Volume            */
 264         if (loudness)                    /* Turn loudness on?     */
 265                 t->volume |= TDA7432_LD_ON;
 266         t->muted    = 1;
 267         t->treble   = TDA7432_TREBLE_0DB; /* 0dB Treble            */
 268         t->bass         = TDA7432_BASS_0DB;      /* 0dB Bass              */
 269         t->lf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 270         t->lr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 271         t->rf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 272         t->rr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 273         t->loud   = loudness;            /* insmod parameter      */
 274
 275         tda7432_set(sd);
 276 }
 277
 278 static int tda7432_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 279 {
 280         struct tda7432 *t = to_state(sd);
 281
 282         switch (ctrl->id) {
 283         case V4L2_CID_AUDIO_MUTE:
 284                 ctrl->value=t->muted;
 285                 return 0;
 286         case V4L2_CID_AUDIO_VOLUME:
 287                 if (!maxvol){  /* max +20db */
 288                         ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 630;
 289                 } else {       /* max 0db   */
 290                         ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 829;
 291                 }
 292                 return 0;
 293         case V4L2_CID_AUDIO_BALANCE:
 294         {
 295                 if ( (t->lf) < (t->rf) )
 296                         /* right is attenuated, balance shifted left */
 297                         ctrl->value = (32768 - 1057*(t->rf));
 298                 else
 299                         /* left is attenuated, balance shifted right */
 300                         ctrl->value = (32768 + 1057*(t->lf));
 301                 return 0;
 302         }
 303         case V4L2_CID_AUDIO_BASS:
 304         {
 305                 /* Bass/treble 4 bits each */
 306                 int bass=t->bass;
 307                 if(bass >= 0x8)
 308                         bass = ~(bass - 0x8) & 0xf;
 309                 ctrl->value = (bass << 12)+(bass << 8)+(bass << 4)+(bass);
 310                 return 0;
 311         }
 312         case V4L2_CID_AUDIO_TREBLE:
 313         {
 314                 int treble=t->treble;
 315                 if(treble >= 0x8)
 316                         treble = ~(treble - 0x8) & 0xf;
 317                 ctrl->value = (treble << 12)+(treble << 8)+(treble << 4)+(treble);
 318                 return 0;
 319         }
 320         }
 321         return -EINVAL;
 322 }
 323
 324 static int tda7432_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 325 {
 326         struct tda7432 *t = to_state(sd);
 327
 328         switch (ctrl->id) {
 329         case V4L2_CID_AUDIO_MUTE:
 330                 t->muted=ctrl->value;
 331                 break;
 332         case V4L2_CID_AUDIO_VOLUME:
 333                 if(!maxvol){ /* max +20db */
 334                         t->volume = 0x6f - ((ctrl->value)/630);
 335                 } else {    /* max 0db   */
 336                         t->volume = 0x6f - ((ctrl->value)/829);
 337                 }
 338                 if (loudness)           /* Turn on the loudness bit */
 339                         t->volume |= TDA7432_LD_ON;
 340
 341                 tda7432_write(sd, TDA7432_VL, t->volume);
 342                 return 0;
 343         case V4L2_CID_AUDIO_BALANCE:
 344                 if (ctrl->value < 32768) {
 345                         /* shifted to left, attenuate right */
 346                         t->rr = (32768 - ctrl->value)/1057;
 347                         t->rf = t->rr;
 348                         t->lr = TDA7432_ATTEN_0DB;
 349                         t->lf = TDA7432_ATTEN_0DB;
 350                 } else if(ctrl->value > 32769) {
 351                         /* shifted to right, attenuate left */
 352                         t->lf = (ctrl->value - 32768)/1057;
 353                         t->lr = t->lf;
 354                         t->rr = TDA7432_ATTEN_0DB;
 355                         t->rf = TDA7432_ATTEN_0DB;
 356                 } else {
 357                         /* centered */
 358                         t->rr = TDA7432_ATTEN_0DB;
 359                         t->rf = TDA7432_ATTEN_0DB;
 360                         t->lf = TDA7432_ATTEN_0DB;
 361                         t->lr = TDA7432_ATTEN_0DB;
 362                 }
 363                 break;
 364         case V4L2_CID_AUDIO_BASS:
 365                 t->bass = ctrl->value >> 12;
 366                 if(t->bass>= 0x8)
 367                                 t->bass = (~t->bass & 0xf) + 0x8 ;
 368
 369                 tda7432_write(sd, TDA7432_TN, 0x10 | (t->bass << 4) | t->treble);
 370                 return 0;
 371         case V4L2_CID_AUDIO_TREBLE:
 372                 t->treble= ctrl->value >> 12;
 373                 if(t->treble>= 0x8)
 374                                 t->treble = (~t->treble & 0xf) + 0x8 ;
 375
 376                 tda7432_write(sd, TDA7432_TN, 0x10 | (t->bass << 4) | t->treble);
 377                 return 0;
 378         default:
 379                 return -EINVAL;
 380         }
 381
 382         /* Used for both mute and balance changes */
 383         if (t->muted)
 384         {
 385                 /* Mute & update balance*/
 386                 tda7432_write(sd, TDA7432_LF, t->lf | TDA7432_MUTE);
 387                 tda7432_write(sd, TDA7432_LR, t->lr | TDA7432_MUTE);
 388                 tda7432_write(sd, TDA7432_RF, t->rf | TDA7432_MUTE);
 389                 tda7432_write(sd, TDA7432_RR, t->rr | TDA7432_MUTE);
 390         } else {
 391                 tda7432_write(sd, TDA7432_LF, t->lf);
 392                 tda7432_write(sd, TDA7432_LR, t->lr);
 393                 tda7432_write(sd, TDA7432_RF, t->rf);
 394                 tda7432_write(sd, TDA7432_RR, t->rr);
 395         }
 396         return 0;
 397 }
 398
 399 static int tda7432_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 400 {
 401         switch (qc->id) {
 402         case V4L2_CID_AUDIO_VOLUME:
 403                 return v4l2_ctrl_query_fill(qc, 0, 65535, 65535 / 100, 58880);
 404         case V4L2_CID_AUDIO_MUTE:
 405                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
 406         case V4L2_CID_AUDIO_BALANCE:
 407         case V4L2_CID_AUDIO_BASS:
 408         case V4L2_CID_AUDIO_TREBLE:
 409                 return v4l2_ctrl_query_fill(qc, 0, 65535, 65535 / 100, 32768);
 410         }
 411         return -EINVAL;
 412 }
 413
 414 /* ----------------------------------------------------------------------- */
 415
 416 static const struct v4l2_subdev_core_ops tda7432_core_ops = {
 417         .queryctrl = tda7432_queryctrl,
 418         .g_ctrl = tda7432_g_ctrl,
 419         .s_ctrl = tda7432_s_ctrl,
 420 };
 421
 422 static const struct v4l2_subdev_ops tda7432_ops = {
 423         .core = &tda7432_core_ops,
 424 };
 425
 426 /* ----------------------------------------------------------------------- */
 427
 428 /* *********************** *
 429  * i2c interface functions *
 430  * *********************** */
 431
 432 static int tda7432_probe(struct i2c_client *client,
 433                         const struct i2c_device_id *id)
 434 {
 435         struct tda7432 *t;
 436         struct v4l2_subdev *sd;
 437
 438         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 439                         client->addr << 1, client->adapter->name);
 440
 441         t = kzalloc(sizeof(*t), GFP_KERNEL);
 442         if (!t)
 443                 return -ENOMEM;
 444         sd = &t->sd;
 445         v4l2_i2c_subdev_init(sd, client, &tda7432_ops);
 446         if (loudness < 0 || loudness > 15) {
 447                 v4l2_warn(sd, "loudness parameter must be between 0 and 15\n");
 448                 if (loudness < 0)
 449                         loudness = 0;
 450                 if (loudness > 15)
 451                         loudness = 15;
 452         }
 453
 454         do_tda7432_init(sd);
 455         return 0;
 456 }
 457
 458 static int tda7432_remove(struct i2c_client *client)
 459 {
 460         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 461
 462         do_tda7432_init(sd);
 463         v4l2_device_unregister_subdev(sd);
 464         kfree(to_state(sd));
 465         return 0;
 466 }
 467
 468 static const struct i2c_device_id tda7432_id[] = {
 469         { "tda7432", 0 },
 470         { }
 471 };
 472 MODULE_DEVICE_TABLE(i2c, tda7432_id);
 473
 474 static struct i2c_driver tda7432_driver = {
 475         .driver = {
 476                 .owner  = THIS_MODULE,
 477                 .name   = "tda7432",
 478         },
 479         .probe          = tda7432_probe,
 480         .remove         = tda7432_remove,
 481         .id_table       = tda7432_id,
 482 };
 483
 484 static __init int init_tda7432(void)
 485 {
 486         return i2c_add_driver(&tda7432_driver);
 487 }
 488
 489 static __exit void exit_tda7432(void)
 490 {
 491         i2c_del_driver(&tda7432_driver);
 492 }
 493
 494 module_init(init_tda7432);
 495 module_exit(exit_tda7432);