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/sched.h>
  42 #include <linux/string.h>
  43 #include <linux/timer.h>
  44 #include <linux/delay.h>
  45 #include <linux/errno.h>
  46 #include <linux/slab.h>
  47 #include <linux/videodev.h>
  48 #include <linux/i2c.h>
  49 #include <linux/i2c-algo-bit.h>
  50
  51 #include <media/audiochip.h>
  52 #include <media/v4l2-common.h>
  53 #include <media/i2c-addr.h>
  54
  55 #ifndef VIDEO_AUDIO_BALANCE
  56 # define VIDEO_AUDIO_BALANCE 32
  57 #endif
  58
  59 MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
  60 MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
  61 MODULE_LICENSE("GPL");
  62
  63 static int maxvol;
  64 static int loudness; /* disable loudness by default */
  65 static int debug;        /* insmod parameter */
  66 module_param(debug, int, S_IRUGO | S_IWUSR);
  67 module_param(loudness, int, S_IRUGO);
  68 MODULE_PARM_DESC(maxvol,"Set maximium volume to +20db (0), default is 0db(1)");
  69 module_param(maxvol, int, S_IRUGO | S_IWUSR);
  70
  71
  72 /* Address to scan (I2C address of this chip) */
  73 static unsigned short normal_i2c[] = {
  74         I2C_ADDR_TDA7432 >> 1,
  75         I2C_CLIENT_END,
  76 };
  77 I2C_CLIENT_INSMOD;
  78
  79 /* Structure of address and subaddresses for the tda7432 */
  80
  81 struct tda7432 {
  82         int addr;
  83         int input;
  84         int volume;
  85         int muted;
  86         int bass, treble;
  87         int lf, lr, rf, rr;
  88         int loud;
  89         struct i2c_client c;
  90 };
  91 static struct i2c_driver driver;
  92 static struct i2c_client client_template;
  93
  94 /* The TDA7432 is made by STS-Thompson
  95  * http://www.st.com
  96  * http://us.st.com/stonline/books/pdf/docs/4056.pdf
  97  *
  98  * TDA7432: I2C-bus controlled basic audio processor
  99  *
 100  * The TDA7432 controls basic audio functions like volume, balance,
 101  * and tone control (including loudness).  It also has four channel
 102  * output (for front and rear).  Since most vidcap cards probably
 103  * don't have 4 channel output, this driver will set front & rear
 104  * together (no independent control).
 105  */
 106
 107                 /* Subaddresses for TDA7432 */
 108
 109 #define TDA7432_IN      0x00 /* Input select                 */
 110 #define TDA7432_VL      0x01 /* Volume                       */
 111 #define TDA7432_TN      0x02 /* Bass, Treble (Tone)          */
 112 #define TDA7432_LF      0x03 /* Attenuation LF (Left Front)  */
 113 #define TDA7432_LR      0x04 /* Attenuation LR (Left Rear)   */
 114 #define TDA7432_RF      0x05 /* Attenuation RF (Right Front) */
 115 #define TDA7432_RR      0x06 /* Attenuation RR (Right Rear)  */
 116 #define TDA7432_LD      0x07 /* Loudness                     */
 117
 118
 119                 /* Masks for bits in TDA7432 subaddresses */
 120
 121 /* Many of these not used - just for documentation */
 122
 123 /* Subaddress 0x00 - Input selection and bass control */
 124
 125 /* Bits 0,1,2 control input:
 126  * 0x00 - Stereo input
 127  * 0x02 - Mono input
 128  * 0x03 - Mute  (Using Attenuators Plays better with modules)
 129  * Mono probably isn't used - I'm guessing only the stereo
 130  * input is connected on most cards, so we'll set it to stereo.
 131  *
 132  * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
 133  * Bit 4 controls bass range: 0/1 is extended/standard bass range
 134  *
 135  * Highest 3 bits not used
 136  */
 137
 138 #define TDA7432_STEREO_IN       0
 139 #define TDA7432_MONO_IN         2       /* Probably won't be used */
 140 #define TDA7432_BASS_SYM        1 << 3
 141 #define TDA7432_BASS_NORM       1 << 4
 142
 143 /* Subaddress 0x01 - Volume */
 144
 145 /* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
 146  * Recommended maximum is +20 dB
 147  *
 148  * +32dB: 0x00
 149  * +20dB: 0x0c
 150  *   0dB: 0x20
 151  * -79dB: 0x6f
 152  *
 153  * MSB (bit 7) controls loudness: 1/0 is loudness on/off
 154  */
 155
 156 #define TDA7432_VOL_0DB         0x20
 157 #define TDA7432_LD_ON           1 << 7
 158
 159
 160 /* Subaddress 0x02 - Tone control */
 161
 162 /* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
 163  * 0x0 is 14dB, 0x7 is 0dB
 164  *
 165  * Bit 3 controls treble attenuation/gain (sign)
 166  * 1 = gain (+)
 167  * 0 = attenuation (-)
 168  *
 169  * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
 170  * (This is only true for normal base range, set in 0x00)
 171  * 0x0 << 4 is 14dB, 0x7 is 0dB
 172  *
 173  * Bit 7 controls bass attenuation/gain (sign)
 174  * 1 << 7 = gain (+)
 175  * 0 << 7 = attenuation (-)
 176  *
 177  * Example:
 178  * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
 179  */
 180
 181 #define TDA7432_TREBLE_0DB              0xf
 182 #define TDA7432_TREBLE                  7
 183 #define TDA7432_TREBLE_GAIN             1 << 3
 184 #define TDA7432_BASS_0DB                0xf
 185 #define TDA7432_BASS                    7 << 4
 186 #define TDA7432_BASS_GAIN               1 << 7
 187
 188
 189 /* Subaddress 0x03 - Left  Front attenuation */
 190 /* Subaddress 0x04 - Left  Rear  attenuation */
 191 /* Subaddress 0x05 - Right Front attenuation */
 192 /* Subaddress 0x06 - Right Rear  attenuation */
 193
 194 /* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
 195  * in 1.5dB steps.
 196  *
 197  * 0x00 is     0dB
 198  * 0x1f is -37.5dB
 199  *
 200  * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
 201  * We'll use the mute on the input, though (above)
 202  * Bits 6,7 unused
 203  */
 204
 205 #define TDA7432_ATTEN_0DB       0x00
 206 #define TDA7432_MUTE        0x1 << 5
 207
 208
 209 /* Subaddress 0x07 - Loudness Control */
 210
 211 /* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
 212  * when bit 4 is NOT set
 213  *
 214  * 0x0 is   0dB
 215  * 0xf is -15dB
 216  *
 217  * If bit 4 is set, then there is a flat attenuation according to
 218  * the lower 4 bits, as above.
 219  *
 220  * Bits 5,6,7 unused
 221  */
 222
 223
 224
 225 /* Begin code */
 226
 227 static int tda7432_write(struct i2c_client *client, int subaddr, int val)
 228 {
 229         unsigned char buffer[2];
 230         v4l_dbg(2, debug,client,"In tda7432_write\n");
 231         v4l_dbg(1, debug,client,"Writing %d 0x%x\n", subaddr, val);
 232         buffer[0] = subaddr;
 233         buffer[1] = val;
 234         if (2 != i2c_master_send(client,buffer,2)) {
 235                 v4l_err(client,"I/O error, trying (write %d 0x%x)\n",
 236                        subaddr, val);
 237                 return -1;
 238         }
 239         return 0;
 240 }
 241
 242 /* I don't think we ever actually _read_ the chip... */
 243
 244 static int tda7432_set(struct i2c_client *client)
 245 {
 246         struct tda7432 *t = i2c_get_clientdata(client);
 247         unsigned char buf[16];
 248         v4l_dbg(2, debug,client,"In tda7432_set\n");
 249
 250         v4l_dbg(1, debug,client,
 251                 "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
 252                 t->input,t->volume,t->bass,t->treble,t->lf,t->lr,t->rf,t->rr,t->loud);
 253         buf[0]  = TDA7432_IN;
 254         buf[1]  = t->input;
 255         buf[2]  = t->volume;
 256         buf[3]  = t->bass;
 257         buf[4]  = t->treble;
 258         buf[5]  = t->lf;
 259         buf[6]  = t->lr;
 260         buf[7]  = t->rf;
 261         buf[8]  = t->rr;
 262         buf[9]  = t->loud;
 263         if (10 != i2c_master_send(client,buf,10)) {
 264                 v4l_err(client,"I/O error, trying tda7432_set\n");
 265                 return -1;
 266         }
 267
 268         return 0;
 269 }
 270
 271 static void do_tda7432_init(struct i2c_client *client)
 272 {
 273         struct tda7432 *t = i2c_get_clientdata(client);
 274         v4l_dbg(2, debug,client,"In tda7432_init\n");
 275
 276         t->input  = TDA7432_STEREO_IN |  /* Main (stereo) input   */
 277                     TDA7432_BASS_SYM  |  /* Symmetric bass cut    */
 278                     TDA7432_BASS_NORM;   /* Normal bass range     */
 279         t->volume =  0x3b ;                              /* -27dB Volume            */
 280         if (loudness)                    /* Turn loudness on?     */
 281                 t->volume |= TDA7432_LD_ON;
 282         t->muted    = VIDEO_AUDIO_MUTE;
 283         t->treble   = TDA7432_TREBLE_0DB; /* 0dB Treble            */
 284         t->bass         = TDA7432_BASS_0DB;      /* 0dB Bass              */
 285         t->lf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 286         t->lr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 287         t->rf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 288         t->rr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 289         t->loud   = loudness;            /* insmod parameter      */
 290
 291         tda7432_set(client);
 292 }
 293
 294 /* *********************** *
 295  * i2c interface functions *
 296  * *********************** */
 297
 298 static int tda7432_attach(struct i2c_adapter *adap, int addr, int kind)
 299 {
 300         struct tda7432 *t;
 301         struct i2c_client *client;
 302
 303         t = kzalloc(sizeof *t,GFP_KERNEL);
 304         if (!t)
 305                 return -ENOMEM;
 306
 307         client = &t->c;
 308         memcpy(client,&client_template,sizeof(struct i2c_client));
 309         client->adapter = adap;
 310         client->addr = addr;
 311         i2c_set_clientdata(client, t);
 312
 313         do_tda7432_init(client);
 314         i2c_attach_client(client);
 315
 316         v4l_info(client, "chip found @ 0x%x (%s)\n", addr << 1, adap->name);
 317         return 0;
 318 }
 319
 320 static int tda7432_probe(struct i2c_adapter *adap)
 321 {
 322         if (adap->class & I2C_CLASS_TV_ANALOG)
 323                 return i2c_probe(adap, &addr_data, tda7432_attach);
 324         return 0;
 325 }
 326
 327 static int tda7432_detach(struct i2c_client *client)
 328 {
 329         struct tda7432 *t  = i2c_get_clientdata(client);
 330
 331         do_tda7432_init(client);
 332         i2c_detach_client(client);
 333
 334         kfree(t);
 335         return 0;
 336 }
 337
 338 static int tda7432_command(struct i2c_client *client,
 339                            unsigned int cmd, void *arg)
 340 {
 341         struct tda7432 *t = i2c_get_clientdata(client);
 342         v4l_dbg(2, debug,client,"In tda7432_command\n");
 343         if (debug>1)
 344                 v4l_i2c_print_ioctl(client,cmd);
 345
 346         switch (cmd) {
 347         /* --- v4l ioctls --- */
 348         /* take care: bttv does userspace copying, we'll get a
 349            kernel pointer here... */
 350
 351         /* Query card - scale from TDA7432 settings to V4L settings */
 352         case VIDIOCGAUDIO:
 353         {
 354                 struct video_audio *va = arg;
 355
 356                 va->flags |= VIDEO_AUDIO_VOLUME |
 357                         VIDEO_AUDIO_BASS |
 358                         VIDEO_AUDIO_TREBLE |
 359                         VIDEO_AUDIO_MUTABLE;
 360                 if (t->muted)
 361                         va->flags |= VIDEO_AUDIO_MUTE;
 362                 va->mode |= VIDEO_SOUND_STEREO;
 363                 /* Master volume control
 364                  * V4L volume is min 0, max 65535
 365                  * TDA7432 Volume:
 366                  * Min (-79dB) is 0x6f
 367                  * Max (+20dB) is 0x07 (630)
 368                  * Max (0dB) is 0x20 (829)
 369                  * (Mask out bit 7 of vol - it's for the loudness setting)
 370                  */
 371                 if (!maxvol){  /* max +20db */
 372                         va->volume = ( 0x6f - (t->volume & 0x7F) ) * 630;
 373                 } else {       /* max 0db   */
 374                         va->volume = ( 0x6f - (t->volume & 0x7F) ) * 829;
 375                 }
 376
 377                 /* Balance depends on L,R attenuation
 378                  * V4L balance is 0 to 65535, middle is 32768
 379                  * TDA7432 attenuation: min (0dB) is 0, max (-37.5dB) is 0x1f
 380                  * to scale up to V4L numbers, mult by 1057
 381                  * attenuation exists for lf, lr, rf, rr
 382                  * we use only lf and rf (front channels)
 383                  */
 384
 385                 if ( (t->lf) < (t->rf) )
 386                         /* right is attenuated, balance shifted left */
 387                         va->balance = (32768 - 1057*(t->rf));
 388                 else
 389                         /* left is attenuated, balance shifted right */
 390                         va->balance = (32768 + 1057*(t->lf));
 391
 392                 /* Bass/treble 4 bits each */
 393                 va->bass=t->bass;
 394                 if(va->bass >= 0x8)
 395                         va->bass = ~(va->bass - 0x8) & 0xf;
 396                 va->bass = (va->bass << 12)+(va->bass << 8)+(va->bass << 4)+(va->bass);
 397                 va->treble=t->treble;
 398                 if(va->treble >= 0x8)
 399                         va->treble = ~(va->treble - 0x8) & 0xf;
 400                 va->treble = (va->treble << 12)+(va->treble << 8)+(va->treble << 4)+(va->treble);
 401
 402                 break; /* VIDIOCGAUDIO case */
 403         }
 404
 405         /* Set card - scale from V4L settings to TDA7432 settings */
 406         case VIDIOCSAUDIO:
 407         {
 408                 struct video_audio *va = arg;
 409
 410                 if(va->flags & VIDEO_AUDIO_VOLUME){
 411                         if(!maxvol){ /* max +20db */
 412                                 t->volume = 0x6f - ((va->volume)/630);
 413                         } else {    /* max 0db   */
 414                                 t->volume = 0x6f - ((va->volume)/829);
 415                         }
 416
 417                 if (loudness)           /* Turn on the loudness bit */
 418                         t->volume |= TDA7432_LD_ON;
 419
 420                         tda7432_write(client,TDA7432_VL, t->volume);
 421                 }
 422
 423                 if(va->flags & VIDEO_AUDIO_BASS)
 424                 {
 425                         t->bass = va->bass >> 12;
 426                         if(t->bass>= 0x8)
 427                                         t->bass = (~t->bass & 0xf) + 0x8 ;
 428                 }
 429                 if(va->flags & VIDEO_AUDIO_TREBLE)
 430                 {
 431                         t->treble= va->treble >> 12;
 432                         if(t->treble>= 0x8)
 433                                         t->treble = (~t->treble & 0xf) + 0x8 ;
 434                 }
 435                 if(va->flags & (VIDEO_AUDIO_TREBLE| VIDEO_AUDIO_BASS))
 436                         tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble );
 437
 438                 if(va->flags & VIDEO_AUDIO_BALANCE)     {
 439                 if (va->balance < 32768)
 440                 {
 441                         /* shifted to left, attenuate right */
 442                         t->rr = (32768 - va->balance)/1057;
 443                         t->rf = t->rr;
 444                         t->lr = TDA7432_ATTEN_0DB;
 445                         t->lf = TDA7432_ATTEN_0DB;
 446                 }
 447                 else if(va->balance > 32769)
 448                 {
 449                         /* shifted to right, attenuate left */
 450                         t->lf = (va->balance - 32768)/1057;
 451                         t->lr = t->lf;
 452                         t->rr = TDA7432_ATTEN_0DB;
 453                         t->rf = TDA7432_ATTEN_0DB;
 454                 }
 455                 else
 456                 {
 457                         /* centered */
 458                         t->rr = TDA7432_ATTEN_0DB;
 459                         t->rf = TDA7432_ATTEN_0DB;
 460                         t->lf = TDA7432_ATTEN_0DB;
 461                         t->lr = TDA7432_ATTEN_0DB;
 462                 }
 463                 }
 464
 465                 t->muted=(va->flags & VIDEO_AUDIO_MUTE);
 466                 if (t->muted)
 467                 {
 468                         /* Mute & update balance*/
 469                         tda7432_write(client,TDA7432_LF, t->lf | TDA7432_MUTE);
 470                         tda7432_write(client,TDA7432_LR, t->lr | TDA7432_MUTE);
 471                         tda7432_write(client,TDA7432_RF, t->rf | TDA7432_MUTE);
 472                         tda7432_write(client,TDA7432_RR, t->rr | TDA7432_MUTE);
 473                 } else {
 474                         tda7432_write(client,TDA7432_LF, t->lf);
 475                         tda7432_write(client,TDA7432_LR, t->lr);
 476                         tda7432_write(client,TDA7432_RF, t->rf);
 477                         tda7432_write(client,TDA7432_RR, t->rr);
 478                 }
 479
 480                 break;
 481
 482         } /* end of VIDEOCSAUDIO case */
 483
 484         } /* end of (cmd) switch */
 485
 486         return 0;
 487 }
 488
 489 static struct i2c_driver driver = {
 490         .driver = {
 491                 .name    = "tda7432",
 492         },
 493         .id              = I2C_DRIVERID_TDA7432,
 494         .attach_adapter  = tda7432_probe,
 495         .detach_client   = tda7432_detach,
 496         .command         = tda7432_command,
 497 };
 498
 499 static struct i2c_client client_template =
 500 {
 501         .name       = "tda7432",
 502         .driver     = &driver,
 503 };
 504
 505 static int __init tda7432_init(void)
 506 {
 507         if ( (loudness < 0) || (loudness > 15) ) {
 508                 printk(KERN_ERR "loudness parameter must be between 0 and 15\n");
 509                 return -EINVAL;
 510         }
 511
 512         return i2c_add_driver(&driver);
 513 }
 514
 515 static void __exit tda7432_fini(void)
 516 {
 517         i2c_del_driver(&driver);
 518 }
 519
 520 module_init(tda7432_init);
 521 module_exit(tda7432_fini);
 522
 523 /*
 524  * Local variables:
 525  * c-basic-offset: 8
 526  * End:
 527  */