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  * This code is placed under the terms of the GNU General Public License
  12  * Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
  13  * Which was based on tda8425.c by Greg Alexander (c) 1998
  14  *
  15  * OPTIONS:
  16  * debug    - set to 1 if you'd like to see debug messages
  17  *            set to 2 if you'd like to be inundated with debug messages
  18  *
  19  * loudness - set between 0 and 15 for varying degrees of loudness effect
  20  *
  21  * maxvol   - set maximium volume to +20db (1), default is 0db(0)
  22  *
  23  *
  24  *  Revision: 0.7 - maxvol module parm to set maximium volume 0db or +20db
  25  *                              store if muted so we can return it
  26  *                              change balance only if flaged to
  27  *  Revision: 0.6 - added tone controls
  28  *  Revision: 0.5 - Fixed odd balance problem
  29  *  Revision: 0.4 - added muting
  30  *  Revision: 0.3 - Fixed silly reversed volume controls.  :)
  31  *  Revision: 0.2 - Cleaned up #defines
  32  *                      fixed volume control
  33  *          Added I2C_DRIVERID_TDA7432
  34  *                      added loudness insmod control
  35  *  Revision: 0.1 - initial version
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/kernel.h>
  41 #include <linux/string.h>
  42 #include <linux/timer.h>
  43 #include <linux/delay.h>
  44 #include <linux/errno.h>
  45 #include <linux/slab.h>
  46 #include <linux/videodev.h>
  47 #include <linux/i2c.h>
  48 #include <linux/i2c-algo-bit.h>
  49
  50 #include <media/v4l2-common.h>
  51 #include <media/i2c-addr.h>
  52
  53 #ifndef VIDEO_AUDIO_BALANCE
  54 # define VIDEO_AUDIO_BALANCE 32
  55 #endif
  56
  57 MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
  58 MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
  59 MODULE_LICENSE("GPL");
  60
  61 static int maxvol;
  62 static int loudness; /* disable loudness by default */
  63 static int debug;        /* insmod parameter */
  64 module_param(debug, int, S_IRUGO | S_IWUSR);
  65 module_param(loudness, int, S_IRUGO);
  66 MODULE_PARM_DESC(maxvol,"Set maximium volume to +20db (0), default is 0db(1)");
  67 module_param(maxvol, int, S_IRUGO | S_IWUSR);
  68
  69
  70 /* Address to scan (I2C address of this chip) */
  71 static unsigned short normal_i2c[] = {
  72         I2C_ADDR_TDA7432 >> 1,
  73         I2C_CLIENT_END,
  74 };
  75 I2C_CLIENT_INSMOD;
  76
  77 /* Structure of address and subaddresses for the tda7432 */
  78
  79 struct tda7432 {
  80         int addr;
  81         int input;
  82         int volume;
  83         int muted;
  84         int bass, treble;
  85         int lf, lr, rf, rr;
  86         int loud;
  87         struct i2c_client c;
  88 };
  89 static struct i2c_driver driver;
  90 static struct i2c_client client_template;
  91
  92 /* The TDA7432 is made by STS-Thompson
  93  * http://www.st.com
  94  * http://us.st.com/stonline/books/pdf/docs/4056.pdf
  95  *
  96  * TDA7432: I2C-bus controlled basic audio processor
  97  *
  98  * The TDA7432 controls basic audio functions like volume, balance,
  99  * and tone control (including loudness).  It also has four channel
 100  * output (for front and rear).  Since most vidcap cards probably
 101  * don't have 4 channel output, this driver will set front & rear
 102  * together (no independent control).
 103  */
 104
 105                 /* Subaddresses for TDA7432 */
 106
 107 #define TDA7432_IN      0x00 /* Input select                 */
 108 #define TDA7432_VL      0x01 /* Volume                       */
 109 #define TDA7432_TN      0x02 /* Bass, Treble (Tone)          */
 110 #define TDA7432_LF      0x03 /* Attenuation LF (Left Front)  */
 111 #define TDA7432_LR      0x04 /* Attenuation LR (Left Rear)   */
 112 #define TDA7432_RF      0x05 /* Attenuation RF (Right Front) */
 113 #define TDA7432_RR      0x06 /* Attenuation RR (Right Rear)  */
 114 #define TDA7432_LD      0x07 /* Loudness                     */
 115
 116
 117                 /* Masks for bits in TDA7432 subaddresses */
 118
 119 /* Many of these not used - just for documentation */
 120
 121 /* Subaddress 0x00 - Input selection and bass control */
 122
 123 /* Bits 0,1,2 control input:
 124  * 0x00 - Stereo input
 125  * 0x02 - Mono input
 126  * 0x03 - Mute  (Using Attenuators Plays better with modules)
 127  * Mono probably isn't used - I'm guessing only the stereo
 128  * input is connected on most cards, so we'll set it to stereo.
 129  *
 130  * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
 131  * Bit 4 controls bass range: 0/1 is extended/standard bass range
 132  *
 133  * Highest 3 bits not used
 134  */
 135
 136 #define TDA7432_STEREO_IN       0
 137 #define TDA7432_MONO_IN         2       /* Probably won't be used */
 138 #define TDA7432_BASS_SYM        1 << 3
 139 #define TDA7432_BASS_NORM       1 << 4
 140
 141 /* Subaddress 0x01 - Volume */
 142
 143 /* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
 144  * Recommended maximum is +20 dB
 145  *
 146  * +32dB: 0x00
 147  * +20dB: 0x0c
 148  *   0dB: 0x20
 149  * -79dB: 0x6f
 150  *
 151  * MSB (bit 7) controls loudness: 1/0 is loudness on/off
 152  */
 153
 154 #define TDA7432_VOL_0DB         0x20
 155 #define TDA7432_LD_ON           1 << 7
 156
 157
 158 /* Subaddress 0x02 - Tone control */
 159
 160 /* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
 161  * 0x0 is 14dB, 0x7 is 0dB
 162  *
 163  * Bit 3 controls treble attenuation/gain (sign)
 164  * 1 = gain (+)
 165  * 0 = attenuation (-)
 166  *
 167  * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
 168  * (This is only true for normal base range, set in 0x00)
 169  * 0x0 << 4 is 14dB, 0x7 is 0dB
 170  *
 171  * Bit 7 controls bass attenuation/gain (sign)
 172  * 1 << 7 = gain (+)
 173  * 0 << 7 = attenuation (-)
 174  *
 175  * Example:
 176  * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
 177  */
 178
 179 #define TDA7432_TREBLE_0DB              0xf
 180 #define TDA7432_TREBLE                  7
 181 #define TDA7432_TREBLE_GAIN             1 << 3
 182 #define TDA7432_BASS_0DB                0xf
 183 #define TDA7432_BASS                    7 << 4
 184 #define TDA7432_BASS_GAIN               1 << 7
 185
 186
 187 /* Subaddress 0x03 - Left  Front attenuation */
 188 /* Subaddress 0x04 - Left  Rear  attenuation */
 189 /* Subaddress 0x05 - Right Front attenuation */
 190 /* Subaddress 0x06 - Right Rear  attenuation */
 191
 192 /* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
 193  * in 1.5dB steps.
 194  *
 195  * 0x00 is     0dB
 196  * 0x1f is -37.5dB
 197  *
 198  * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
 199  * We'll use the mute on the input, though (above)
 200  * Bits 6,7 unused
 201  */
 202
 203 #define TDA7432_ATTEN_0DB       0x00
 204 #define TDA7432_MUTE        0x1 << 5
 205
 206
 207 /* Subaddress 0x07 - Loudness Control */
 208
 209 /* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
 210  * when bit 4 is NOT set
 211  *
 212  * 0x0 is   0dB
 213  * 0xf is -15dB
 214  *
 215  * If bit 4 is set, then there is a flat attenuation according to
 216  * the lower 4 bits, as above.
 217  *
 218  * Bits 5,6,7 unused
 219  */
 220
 221
 222
 223 /* Begin code */
 224
 225 static int tda7432_write(struct i2c_client *client, int subaddr, int val)
 226 {
 227         unsigned char buffer[2];
 228         v4l_dbg(2, debug,client,"In tda7432_write\n");
 229         v4l_dbg(1, debug,client,"Writing %d 0x%x\n", subaddr, val);
 230         buffer[0] = subaddr;
 231         buffer[1] = val;
 232         if (2 != i2c_master_send(client,buffer,2)) {
 233                 v4l_err(client,"I/O error, trying (write %d 0x%x)\n",
 234                        subaddr, val);
 235                 return -1;
 236         }
 237         return 0;
 238 }
 239
 240 /* I don't think we ever actually _read_ the chip... */
 241
 242 static int tda7432_set(struct i2c_client *client)
 243 {
 244         struct tda7432 *t = i2c_get_clientdata(client);
 245         unsigned char buf[16];
 246         v4l_dbg(2, debug,client,"In tda7432_set\n");
 247
 248         v4l_dbg(1, debug,client,
 249                 "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
 250                 t->input,t->volume,t->bass,t->treble,t->lf,t->lr,t->rf,t->rr,t->loud);
 251         buf[0]  = TDA7432_IN;
 252         buf[1]  = t->input;
 253         buf[2]  = t->volume;
 254         buf[3]  = t->bass;
 255         buf[4]  = t->treble;
 256         buf[5]  = t->lf;
 257         buf[6]  = t->lr;
 258         buf[7]  = t->rf;
 259         buf[8]  = t->rr;
 260         buf[9]  = t->loud;
 261         if (10 != i2c_master_send(client,buf,10)) {
 262                 v4l_err(client,"I/O error, trying tda7432_set\n");
 263                 return -1;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static void do_tda7432_init(struct i2c_client *client)
 270 {
 271         struct tda7432 *t = i2c_get_clientdata(client);
 272         v4l_dbg(2, debug,client,"In tda7432_init\n");
 273
 274         t->input  = TDA7432_STEREO_IN |  /* Main (stereo) input   */
 275                     TDA7432_BASS_SYM  |  /* Symmetric bass cut    */
 276                     TDA7432_BASS_NORM;   /* Normal bass range     */
 277         t->volume =  0x3b ;                              /* -27dB Volume            */
 278         if (loudness)                    /* Turn loudness on?     */
 279                 t->volume |= TDA7432_LD_ON;
 280         t->muted    = VIDEO_AUDIO_MUTE;
 281         t->treble   = TDA7432_TREBLE_0DB; /* 0dB Treble            */
 282         t->bass         = TDA7432_BASS_0DB;      /* 0dB Bass              */
 283         t->lf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 284         t->lr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 285         t->rf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 286         t->rr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 287         t->loud   = loudness;            /* insmod parameter      */
 288
 289         tda7432_set(client);
 290 }
 291
 292 /* *********************** *
 293  * i2c interface functions *
 294  * *********************** */
 295
 296 static int tda7432_attach(struct i2c_adapter *adap, int addr, int kind)
 297 {
 298         struct tda7432 *t;
 299         struct i2c_client *client;
 300
 301         t = kzalloc(sizeof *t,GFP_KERNEL);
 302         if (!t)
 303                 return -ENOMEM;
 304
 305         client = &t->c;
 306         memcpy(client,&client_template,sizeof(struct i2c_client));
 307         client->adapter = adap;
 308         client->addr = addr;
 309         i2c_set_clientdata(client, t);
 310
 311         do_tda7432_init(client);
 312         i2c_attach_client(client);
 313
 314         v4l_info(client, "chip found @ 0x%x (%s)\n", addr << 1, adap->name);
 315         return 0;
 316 }
 317
 318 static int tda7432_probe(struct i2c_adapter *adap)
 319 {
 320         if (adap->class & I2C_CLASS_TV_ANALOG)
 321                 return i2c_probe(adap, &addr_data, tda7432_attach);
 322         return 0;
 323 }
 324
 325 static int tda7432_detach(struct i2c_client *client)
 326 {
 327         struct tda7432 *t  = i2c_get_clientdata(client);
 328
 329         do_tda7432_init(client);
 330         i2c_detach_client(client);
 331
 332         kfree(t);
 333         return 0;
 334 }
 335
 336 static int tda7432_command(struct i2c_client *client,
 337                            unsigned int cmd, void *arg)
 338 {
 339         struct tda7432 *t = i2c_get_clientdata(client);
 340         v4l_dbg(2, debug,client,"In tda7432_command\n");
 341         if (debug>1)
 342                 v4l_i2c_print_ioctl(client,cmd);
 343
 344         switch (cmd) {
 345         /* --- v4l ioctls --- */
 346         /* take care: bttv does userspace copying, we'll get a
 347            kernel pointer here... */
 348
 349         /* Query card - scale from TDA7432 settings to V4L settings */
 350         case VIDIOCGAUDIO:
 351         {
 352                 struct video_audio *va = arg;
 353
 354                 va->flags |= VIDEO_AUDIO_VOLUME |
 355                         VIDEO_AUDIO_BASS |
 356                         VIDEO_AUDIO_TREBLE |
 357                         VIDEO_AUDIO_MUTABLE;
 358                 if (t->muted)
 359                         va->flags |= VIDEO_AUDIO_MUTE;
 360                 va->mode |= VIDEO_SOUND_STEREO;
 361                 /* Master volume control
 362                  * V4L volume is min 0, max 65535
 363                  * TDA7432 Volume:
 364                  * Min (-79dB) is 0x6f
 365                  * Max (+20dB) is 0x07 (630)
 366                  * Max (0dB) is 0x20 (829)
 367                  * (Mask out bit 7 of vol - it's for the loudness setting)
 368                  */
 369                 if (!maxvol){  /* max +20db */
 370                         va->volume = ( 0x6f - (t->volume & 0x7F) ) * 630;
 371                 } else {       /* max 0db   */
 372                         va->volume = ( 0x6f - (t->volume & 0x7F) ) * 829;
 373                 }
 374
 375                 /* Balance depends on L,R attenuation
 376                  * V4L balance is 0 to 65535, middle is 32768
 377                  * TDA7432 attenuation: min (0dB) is 0, max (-37.5dB) is 0x1f
 378                  * to scale up to V4L numbers, mult by 1057
 379                  * attenuation exists for lf, lr, rf, rr
 380                  * we use only lf and rf (front channels)
 381                  */
 382
 383                 if ( (t->lf) < (t->rf) )
 384                         /* right is attenuated, balance shifted left */
 385                         va->balance = (32768 - 1057*(t->rf));
 386                 else
 387                         /* left is attenuated, balance shifted right */
 388                         va->balance = (32768 + 1057*(t->lf));
 389
 390                 /* Bass/treble 4 bits each */
 391                 va->bass=t->bass;
 392                 if(va->bass >= 0x8)
 393                         va->bass = ~(va->bass - 0x8) & 0xf;
 394                 va->bass = (va->bass << 12)+(va->bass << 8)+(va->bass << 4)+(va->bass);
 395                 va->treble=t->treble;
 396                 if(va->treble >= 0x8)
 397                         va->treble = ~(va->treble - 0x8) & 0xf;
 398                 va->treble = (va->treble << 12)+(va->treble << 8)+(va->treble << 4)+(va->treble);
 399
 400                 break; /* VIDIOCGAUDIO case */
 401         }
 402
 403         /* Set card - scale from V4L settings to TDA7432 settings */
 404         case VIDIOCSAUDIO:
 405         {
 406                 struct video_audio *va = arg;
 407
 408                 if(va->flags & VIDEO_AUDIO_VOLUME){
 409                         if(!maxvol){ /* max +20db */
 410                                 t->volume = 0x6f - ((va->volume)/630);
 411                         } else {    /* max 0db   */
 412                                 t->volume = 0x6f - ((va->volume)/829);
 413                         }
 414
 415                 if (loudness)           /* Turn on the loudness bit */
 416                         t->volume |= TDA7432_LD_ON;
 417
 418                         tda7432_write(client,TDA7432_VL, t->volume);
 419                 }
 420
 421                 if(va->flags & VIDEO_AUDIO_BASS)
 422                 {
 423                         t->bass = va->bass >> 12;
 424                         if(t->bass>= 0x8)
 425                                         t->bass = (~t->bass & 0xf) + 0x8 ;
 426                 }
 427                 if(va->flags & VIDEO_AUDIO_TREBLE)
 428                 {
 429                         t->treble= va->treble >> 12;
 430                         if(t->treble>= 0x8)
 431                                         t->treble = (~t->treble & 0xf) + 0x8 ;
 432                 }
 433                 if(va->flags & (VIDEO_AUDIO_TREBLE| VIDEO_AUDIO_BASS))
 434                         tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble );
 435
 436                 if(va->flags & VIDEO_AUDIO_BALANCE)     {
 437                 if (va->balance < 32768)
 438                 {
 439                         /* shifted to left, attenuate right */
 440                         t->rr = (32768 - va->balance)/1057;
 441                         t->rf = t->rr;
 442                         t->lr = TDA7432_ATTEN_0DB;
 443                         t->lf = TDA7432_ATTEN_0DB;
 444                 }
 445                 else if(va->balance > 32769)
 446                 {
 447                         /* shifted to right, attenuate left */
 448                         t->lf = (va->balance - 32768)/1057;
 449                         t->lr = t->lf;
 450                         t->rr = TDA7432_ATTEN_0DB;
 451                         t->rf = TDA7432_ATTEN_0DB;
 452                 }
 453                 else
 454                 {
 455                         /* centered */
 456                         t->rr = TDA7432_ATTEN_0DB;
 457                         t->rf = TDA7432_ATTEN_0DB;
 458                         t->lf = TDA7432_ATTEN_0DB;
 459                         t->lr = TDA7432_ATTEN_0DB;
 460                 }
 461                 }
 462
 463                 t->muted=(va->flags & VIDEO_AUDIO_MUTE);
 464                 if (t->muted)
 465                 {
 466                         /* Mute & update balance*/
 467                         tda7432_write(client,TDA7432_LF, t->lf | TDA7432_MUTE);
 468                         tda7432_write(client,TDA7432_LR, t->lr | TDA7432_MUTE);
 469                         tda7432_write(client,TDA7432_RF, t->rf | TDA7432_MUTE);
 470                         tda7432_write(client,TDA7432_RR, t->rr | TDA7432_MUTE);
 471                 } else {
 472                         tda7432_write(client,TDA7432_LF, t->lf);
 473                         tda7432_write(client,TDA7432_LR, t->lr);
 474                         tda7432_write(client,TDA7432_RF, t->rf);
 475                         tda7432_write(client,TDA7432_RR, t->rr);
 476                 }
 477
 478                 break;
 479
 480         } /* end of VIDEOCSAUDIO case */
 481
 482         } /* end of (cmd) switch */
 483
 484         return 0;
 485 }
 486
 487 static struct i2c_driver driver = {
 488         .driver = {
 489                 .name    = "tda7432",
 490         },
 491         .id              = I2C_DRIVERID_TDA7432,
 492         .attach_adapter  = tda7432_probe,
 493         .detach_client   = tda7432_detach,
 494         .command         = tda7432_command,
 495 };
 496
 497 static struct i2c_client client_template =
 498 {
 499         .name       = "tda7432",
 500         .driver     = &driver,
 501 };
 502
 503 static int __init tda7432_init(void)
 504 {
 505         if ( (loudness < 0) || (loudness > 15) ) {
 506                 printk(KERN_ERR "loudness parameter must be between 0 and 15\n");
 507                 return -EINVAL;
 508         }
 509
 510         return i2c_add_driver(&driver);
 511 }
 512
 513 static void __exit tda7432_fini(void)
 514 {
 515         i2c_del_driver(&driver);
 516 }
 517
 518 module_init(tda7432_init);
 519 module_exit(tda7432_fini);
 520
 521 /*
 522  * Local variables:
 523  * c-basic-offset: 8
 524  * End:
 525  */