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 "bttv.h"
  52 #include <media/audiochip.h>
  53 #include <media/id.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_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 #define dprintk  if (debug) printk
  95 #define d2printk if (debug > 1) printk
  96
  97 /* The TDA7432 is made by STS-Thompson
  98  * http://www.st.com
  99  * http://us.st.com/stonline/books/pdf/docs/4056.pdf
 100  *
 101  * TDA7432: I2C-bus controlled basic audio processor
 102  *
 103  * The TDA7432 controls basic audio functions like volume, balance,
 104  * and tone control (including loudness).  It also has four channel
 105  * output (for front and rear).  Since most vidcap cards probably
 106  * don't have 4 channel output, this driver will set front & rear
 107  * together (no independent control).
 108  */
 109
 110                 /* Subaddresses for TDA7432 */
 111
 112 #define TDA7432_IN      0x00 /* Input select                 */
 113 #define TDA7432_VL      0x01 /* Volume                       */
 114 #define TDA7432_TN      0x02 /* Bass, Treble (Tone)          */
 115 #define TDA7432_LF      0x03 /* Attenuation LF (Left Front)  */
 116 #define TDA7432_LR      0x04 /* Attenuation LR (Left Rear)   */
 117 #define TDA7432_RF      0x05 /* Attenuation RF (Right Front) */
 118 #define TDA7432_RR      0x06 /* Attenuation RR (Right Rear)  */
 119 #define TDA7432_LD      0x07 /* Loudness                     */
 120
 121
 122                 /* Masks for bits in TDA7432 subaddresses */
 123
 124 /* Many of these not used - just for documentation */
 125
 126 /* Subaddress 0x00 - Input selection and bass control */
 127
 128 /* Bits 0,1,2 control input:
 129  * 0x00 - Stereo input
 130  * 0x02 - Mono input
 131  * 0x03 - Mute  (Using Attenuators Plays better with modules)
 132  * Mono probably isn't used - I'm guessing only the stereo
 133  * input is connected on most cards, so we'll set it to stereo.
 134  *
 135  * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
 136  * Bit 4 controls bass range: 0/1 is extended/standard bass range
 137  *
 138  * Highest 3 bits not used
 139  */
 140
 141 #define TDA7432_STEREO_IN       0
 142 #define TDA7432_MONO_IN         2       /* Probably won't be used */
 143 #define TDA7432_BASS_SYM        1 << 3
 144 #define TDA7432_BASS_NORM       1 << 4
 145
 146 /* Subaddress 0x01 - Volume */
 147
 148 /* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
 149  * Recommended maximum is +20 dB
 150  *
 151  * +32dB: 0x00
 152  * +20dB: 0x0c
 153  *   0dB: 0x20
 154  * -79dB: 0x6f
 155  *
 156  * MSB (bit 7) controls loudness: 1/0 is loudness on/off
 157  */
 158
 159 #define TDA7432_VOL_0DB         0x20
 160 #define TDA7432_LD_ON           1 << 7
 161
 162
 163 /* Subaddress 0x02 - Tone control */
 164
 165 /* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
 166  * 0x0 is 14dB, 0x7 is 0dB
 167  *
 168  * Bit 3 controls treble attenuation/gain (sign)
 169  * 1 = gain (+)
 170  * 0 = attenuation (-)
 171  *
 172  * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
 173  * (This is only true for normal base range, set in 0x00)
 174  * 0x0 << 4 is 14dB, 0x7 is 0dB
 175  *
 176  * Bit 7 controls bass attenuation/gain (sign)
 177  * 1 << 7 = gain (+)
 178  * 0 << 7 = attenuation (-)
 179  *
 180  * Example:
 181  * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
 182  */
 183
 184 #define TDA7432_TREBLE_0DB              0xf
 185 #define TDA7432_TREBLE                  7
 186 #define TDA7432_TREBLE_GAIN             1 << 3
 187 #define TDA7432_BASS_0DB                0xf
 188 #define TDA7432_BASS                    7 << 4
 189 #define TDA7432_BASS_GAIN               1 << 7
 190
 191
 192 /* Subaddress 0x03 - Left  Front attenuation */
 193 /* Subaddress 0x04 - Left  Rear  attenuation */
 194 /* Subaddress 0x05 - Right Front attenuation */
 195 /* Subaddress 0x06 - Right Rear  attenuation */
 196
 197 /* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
 198  * in 1.5dB steps.
 199  *
 200  * 0x00 is     0dB
 201  * 0x1f is -37.5dB
 202  *
 203  * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
 204  * We'll use the mute on the input, though (above)
 205  * Bits 6,7 unused
 206  */
 207
 208 #define TDA7432_ATTEN_0DB       0x00
 209 #define TDA7432_MUTE        0x1 << 5
 210
 211
 212 /* Subaddress 0x07 - Loudness Control */
 213
 214 /* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
 215  * when bit 4 is NOT set
 216  *
 217  * 0x0 is   0dB
 218  * 0xf is -15dB
 219  *
 220  * If bit 4 is set, then there is a flat attenuation according to
 221  * the lower 4 bits, as above.
 222  *
 223  * Bits 5,6,7 unused
 224  */
 225
 226
 227
 228 /* Begin code */
 229
 230 static int tda7432_write(struct i2c_client *client, int subaddr, int val)
 231 {
 232         unsigned char buffer[2];
 233         d2printk("tda7432: In tda7432_write\n");
 234         dprintk("tda7432: Writing %d 0x%x\n", subaddr, val);
 235         buffer[0] = subaddr;
 236         buffer[1] = val;
 237         if (2 != i2c_master_send(client,buffer,2)) {
 238                 printk(KERN_WARNING "tda7432: I/O error, trying (write %d 0x%x)\n",
 239                        subaddr, val);
 240                 return -1;
 241         }
 242         return 0;
 243 }
 244
 245 /* I don't think we ever actually _read_ the chip... */
 246
 247 static int tda7432_set(struct i2c_client *client)
 248 {
 249         struct tda7432 *t = i2c_get_clientdata(client);
 250         unsigned char buf[16];
 251         d2printk("tda7432: In tda7432_set\n");
 252
 253         dprintk(KERN_INFO
 254                 "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
 255                 t->input,t->volume,t->bass,t->treble,t->lf,t->lr,t->rf,t->rr,t->loud);
 256         buf[0]  = TDA7432_IN;
 257         buf[1]  = t->input;
 258         buf[2]  = t->volume;
 259         buf[3]  = t->bass;
 260         buf[4]  = t->treble;
 261         buf[5]  = t->lf;
 262         buf[6]  = t->lr;
 263         buf[7]  = t->rf;
 264         buf[8]  = t->rr;
 265         buf[9]  = t->loud;
 266         if (10 != i2c_master_send(client,buf,10)) {
 267                 printk(KERN_WARNING "tda7432: I/O error, trying tda7432_set\n");
 268                 return -1;
 269         }
 270
 271         return 0;
 272 }
 273
 274 static void do_tda7432_init(struct i2c_client *client)
 275 {
 276         struct tda7432 *t = i2c_get_clientdata(client);
 277         d2printk("tda7432: In tda7432_init\n");
 278
 279         t->input  = TDA7432_STEREO_IN |  /* Main (stereo) input   */
 280                     TDA7432_BASS_SYM  |  /* Symmetric bass cut    */
 281                     TDA7432_BASS_NORM;   /* Normal bass range     */
 282         t->volume =  0x3b ;                              /* -27dB Volume            */
 283         if (loudness)                    /* Turn loudness on?     */
 284                 t->volume |= TDA7432_LD_ON;
 285         t->muted    = VIDEO_AUDIO_MUTE;
 286         t->treble   = TDA7432_TREBLE_0DB; /* 0dB Treble            */
 287         t->bass         = TDA7432_BASS_0DB;      /* 0dB Bass              */
 288         t->lf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 289         t->lr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 290         t->rf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 291         t->rr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 292         t->loud   = loudness;            /* insmod parameter      */
 293
 294         tda7432_set(client);
 295 }
 296
 297 /* *********************** *
 298  * i2c interface functions *
 299  * *********************** */
 300
 301 static int tda7432_attach(struct i2c_adapter *adap, int addr, int kind)
 302 {
 303         struct tda7432 *t;
 304         struct i2c_client *client;
 305         d2printk("tda7432: In tda7432_attach\n");
 306
 307         t = kmalloc(sizeof *t,GFP_KERNEL);
 308         if (!t)
 309                 return -ENOMEM;
 310         memset(t,0,sizeof *t);
 311
 312         client = &t->c;
 313         memcpy(client,&client_template,sizeof(struct i2c_client));
 314         client->adapter = adap;
 315         client->addr = addr;
 316         i2c_set_clientdata(client, t);
 317
 318         do_tda7432_init(client);
 319         printk(KERN_INFO "tda7432: init\n");
 320
 321         i2c_attach_client(client);
 322         return 0;
 323 }
 324
 325 static int tda7432_probe(struct i2c_adapter *adap)
 326 {
 327 #ifdef I2C_CLASS_TV_ANALOG
 328         if (adap->class & I2C_CLASS_TV_ANALOG)
 329                 return i2c_probe(adap, &addr_data, tda7432_attach);
 330 #else
 331         if (adap->id == I2C_HW_B_BT848)
 332                 return i2c_probe(adap, &addr_data, tda7432_attach);
 333 #endif
 334         return 0;
 335 }
 336
 337 static int tda7432_detach(struct i2c_client *client)
 338 {
 339         struct tda7432 *t  = i2c_get_clientdata(client);
 340
 341         do_tda7432_init(client);
 342         i2c_detach_client(client);
 343
 344         kfree(t);
 345         return 0;
 346 }
 347
 348 static int tda7432_command(struct i2c_client *client,
 349                            unsigned int cmd, void *arg)
 350 {
 351         struct tda7432 *t = i2c_get_clientdata(client);
 352         d2printk("tda7432: In tda7432_command\n");
 353
 354         switch (cmd) {
 355         /* --- v4l ioctls --- */
 356         /* take care: bttv does userspace copying, we'll get a
 357            kernel pointer here... */
 358
 359         /* Query card - scale from TDA7432 settings to V4L settings */
 360         case VIDIOCGAUDIO:
 361         {
 362                 struct video_audio *va = arg;
 363                 dprintk("tda7432: VIDIOCGAUDIO\n");
 364
 365                 va->flags |= VIDEO_AUDIO_VOLUME |
 366                         VIDEO_AUDIO_BASS |
 367                         VIDEO_AUDIO_TREBLE |
 368                         VIDEO_AUDIO_MUTABLE;
 369                 if (t->muted)
 370                         va->flags |= VIDEO_AUDIO_MUTE;
 371                 va->mode |= VIDEO_SOUND_STEREO;
 372                 /* Master volume control
 373                  * V4L volume is min 0, max 65535
 374                  * TDA7432 Volume:
 375                  * Min (-79dB) is 0x6f
 376                  * Max (+20dB) is 0x07 (630)
 377                  * Max (0dB) is 0x20 (829)
 378                  * (Mask out bit 7 of vol - it's for the loudness setting)
 379                  */
 380                 if (!maxvol){  /* max +20db */
 381                         va->volume = ( 0x6f - (t->volume & 0x7F) ) * 630;
 382                 } else {       /* max 0db   */
 383                         va->volume = ( 0x6f - (t->volume & 0x7F) ) * 829;
 384                 }
 385
 386                 /* Balance depends on L,R attenuation
 387                  * V4L balance is 0 to 65535, middle is 32768
 388                  * TDA7432 attenuation: min (0dB) is 0, max (-37.5dB) is 0x1f
 389                  * to scale up to V4L numbers, mult by 1057
 390                  * attenuation exists for lf, lr, rf, rr
 391                  * we use only lf and rf (front channels)
 392                  */
 393
 394                 if ( (t->lf) < (t->rf) )
 395                         /* right is attenuated, balance shifted left */
 396                         va->balance = (32768 - 1057*(t->rf));
 397                 else
 398                         /* left is attenuated, balance shifted right */
 399                         va->balance = (32768 + 1057*(t->lf));
 400
 401                 /* Bass/treble 4 bits each */
 402                 va->bass=t->bass;
 403                 if(va->bass >= 0x8)
 404                         va->bass = ~(va->bass - 0x8) & 0xf;
 405                 va->bass = (va->bass << 12)+(va->bass << 8)+(va->bass << 4)+(va->bass);
 406                 va->treble=t->treble;
 407                 if(va->treble >= 0x8)
 408                         va->treble = ~(va->treble - 0x8) & 0xf;
 409                 va->treble = (va->treble << 12)+(va->treble << 8)+(va->treble << 4)+(va->treble);
 410
 411                 break; /* VIDIOCGAUDIO case */
 412         }
 413
 414         /* Set card - scale from V4L settings to TDA7432 settings */
 415         case VIDIOCSAUDIO:
 416         {
 417                 struct video_audio *va = arg;
 418                 dprintk("tda7432: VIDEOCSAUDIO\n");
 419
 420                 if(va->flags & VIDEO_AUDIO_VOLUME){
 421                         if(!maxvol){ /* max +20db */
 422                                 t->volume = 0x6f - ((va->volume)/630);
 423                         } else {    /* max 0db   */
 424                                 t->volume = 0x6f - ((va->volume)/829);
 425                         }
 426
 427                 if (loudness)           /* Turn on the loudness bit */
 428                         t->volume |= TDA7432_LD_ON;
 429
 430                         tda7432_write(client,TDA7432_VL, t->volume);
 431                 }
 432
 433                 if(va->flags & VIDEO_AUDIO_BASS)
 434                 {
 435                         t->bass = va->bass >> 12;
 436                         if(t->bass>= 0x8)
 437                                         t->bass = (~t->bass & 0xf) + 0x8 ;
 438                 }
 439                 if(va->flags & VIDEO_AUDIO_TREBLE)
 440                 {
 441                         t->treble= va->treble >> 12;
 442                         if(t->treble>= 0x8)
 443                                         t->treble = (~t->treble & 0xf) + 0x8 ;
 444                 }
 445                 if(va->flags & (VIDEO_AUDIO_TREBLE| VIDEO_AUDIO_BASS))
 446                         tda7432_write(client,TDA7432_TN, 0x10 | (t->bass << 4) | t->treble );
 447
 448                 if(va->flags & VIDEO_AUDIO_BALANCE)     {
 449                 if (va->balance < 32768)
 450                 {
 451                         /* shifted to left, attenuate right */
 452                         t->rr = (32768 - va->balance)/1057;
 453                         t->rf = t->rr;
 454                         t->lr = TDA7432_ATTEN_0DB;
 455                         t->lf = TDA7432_ATTEN_0DB;
 456                 }
 457                 else if(va->balance > 32769)
 458                 {
 459                         /* shifted to right, attenuate left */
 460                         t->lf = (va->balance - 32768)/1057;
 461                         t->lr = t->lf;
 462                         t->rr = TDA7432_ATTEN_0DB;
 463                         t->rf = TDA7432_ATTEN_0DB;
 464                 }
 465                 else
 466                 {
 467                         /* centered */
 468                         t->rr = TDA7432_ATTEN_0DB;
 469                         t->rf = TDA7432_ATTEN_0DB;
 470                         t->lf = TDA7432_ATTEN_0DB;
 471                         t->lr = TDA7432_ATTEN_0DB;
 472                 }
 473                 }
 474
 475                 t->muted=(va->flags & VIDEO_AUDIO_MUTE);
 476                 if (t->muted)
 477                 {
 478                         /* Mute & update balance*/
 479                         tda7432_write(client,TDA7432_LF, t->lf | TDA7432_MUTE);
 480                         tda7432_write(client,TDA7432_LR, t->lr | TDA7432_MUTE);
 481                         tda7432_write(client,TDA7432_RF, t->rf | TDA7432_MUTE);
 482                         tda7432_write(client,TDA7432_RR, t->rr | TDA7432_MUTE);
 483                 } else {
 484                         tda7432_write(client,TDA7432_LF, t->lf);
 485                         tda7432_write(client,TDA7432_LR, t->lr);
 486                         tda7432_write(client,TDA7432_RF, t->rf);
 487                         tda7432_write(client,TDA7432_RR, t->rr);
 488                 }
 489
 490                 break;
 491
 492         } /* end of VIDEOCSAUDIO case */
 493
 494         default: /* Not VIDEOCGAUDIO or VIDEOCSAUDIO */
 495
 496                 /* nothing */
 497                 d2printk("tda7432: Default\n");
 498
 499         } /* end of (cmd) switch */
 500
 501         return 0;
 502 }
 503
 504 static struct i2c_driver driver = {
 505         .owner           = THIS_MODULE,
 506         .name            = "i2c tda7432 driver",
 507         .id              = I2C_DRIVERID_TDA7432,
 508         .flags           = I2C_DF_NOTIFY,
 509         .attach_adapter  = tda7432_probe,
 510         .detach_client   = tda7432_detach,
 511         .command         = tda7432_command,
 512 };
 513
 514 static struct i2c_client client_template =
 515 {
 516         .name       = "tda7432",
 517         .driver     = &driver,
 518 };
 519
 520 static int __init tda7432_init(void)
 521 {
 522         if ( (loudness < 0) || (loudness > 15) ) {
 523                 printk(KERN_ERR "tda7432: loudness parameter must be between 0 and 15\n");
 524                 return -EINVAL;
 525         }
 526
 527         return i2c_add_driver(&driver);
 528 }
 529
 530 static void __exit tda7432_fini(void)
 531 {
 532         i2c_del_driver(&driver);
 533 }
 534
 535 module_init(tda7432_init);
 536 module_exit(tda7432_fini);
 537
 538 /*
 539  * Local variables:
 540  * c-basic-offset: 8
 541  * End:
 542  */