linux/drivers/media/i2c/tda7432.c
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   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
  44MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
  45MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
  46MODULE_LICENSE("GPL");
  47
  48static int maxvol;
  49static int loudness; /* disable loudness by default */
  50static int debug;        /* insmod parameter */
  51module_param(debug, int, S_IRUGO | S_IWUSR);
  52MODULE_PARM_DESC(debug, "Set debugging level from 0 to 3. Default is off(0).");
  53module_param(loudness, int, S_IRUGO);
  54MODULE_PARM_DESC(loudness, "Turn loudness on(1) else off(0). Default is off(0).");
  55module_param(maxvol, int, S_IRUGO | S_IWUSR);
  56MODULE_PARM_DESC(maxvol, "Set maximium volume to +20dB(0) else +0dB(1). Default is +20dB(0).");
  57
  58
  59/* Structure of address and subaddresses for the tda7432 */
  60
  61struct tda7432 {
  62        struct v4l2_subdev sd;
  63        int addr;
  64        int input;
  65        int volume;
  66        int muted;
  67        int bass, treble;
  68        int lf, lr, rf, rr;
  69        int loud;
  70};
  71
  72static inline struct tda7432 *to_state(struct v4l2_subdev *sd)
  73{
  74        return container_of(sd, struct tda7432, sd);
  75}
  76
  77/* The TDA7432 is made by STS-Thompson
  78 * http://www.st.com
  79 * http://us.st.com/stonline/books/pdf/docs/4056.pdf
  80 *
  81 * TDA7432: I2C-bus controlled basic audio processor
  82 *
  83 * The TDA7432 controls basic audio functions like volume, balance,
  84 * and tone control (including loudness).  It also has four channel
  85 * output (for front and rear).  Since most vidcap cards probably
  86 * don't have 4 channel output, this driver will set front & rear
  87 * together (no independent control).
  88 */
  89
  90                /* Subaddresses for TDA7432 */
  91
  92#define TDA7432_IN      0x00 /* Input select                 */
  93#define TDA7432_VL      0x01 /* Volume                       */
  94#define TDA7432_TN      0x02 /* Bass, Treble (Tone)          */
  95#define TDA7432_LF      0x03 /* Attenuation LF (Left Front)  */
  96#define TDA7432_LR      0x04 /* Attenuation LR (Left Rear)   */
  97#define TDA7432_RF      0x05 /* Attenuation RF (Right Front) */
  98#define TDA7432_RR      0x06 /* Attenuation RR (Right Rear)  */
  99#define TDA7432_LD      0x07 /* Loudness                     */
 100
 101
 102                /* Masks for bits in TDA7432 subaddresses */
 103
 104/* Many of these not used - just for documentation */
 105
 106/* Subaddress 0x00 - Input selection and bass control */
 107
 108/* Bits 0,1,2 control input:
 109 * 0x00 - Stereo input
 110 * 0x02 - Mono input
 111 * 0x03 - Mute  (Using Attenuators Plays better with modules)
 112 * Mono probably isn't used - I'm guessing only the stereo
 113 * input is connected on most cards, so we'll set it to stereo.
 114 *
 115 * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
 116 * Bit 4 controls bass range: 0/1 is extended/standard bass range
 117 *
 118 * Highest 3 bits not used
 119 */
 120
 121#define TDA7432_STEREO_IN       0
 122#define TDA7432_MONO_IN         2       /* Probably won't be used */
 123#define TDA7432_BASS_SYM        1 << 3
 124#define TDA7432_BASS_NORM       1 << 4
 125
 126/* Subaddress 0x01 - Volume */
 127
 128/* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
 129 * Recommended maximum is +20 dB
 130 *
 131 * +32dB: 0x00
 132 * +20dB: 0x0c
 133 *   0dB: 0x20
 134 * -79dB: 0x6f
 135 *
 136 * MSB (bit 7) controls loudness: 1/0 is loudness on/off
 137 */
 138
 139#define TDA7432_VOL_0DB         0x20
 140#define TDA7432_LD_ON           1 << 7
 141
 142
 143/* Subaddress 0x02 - Tone control */
 144
 145/* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
 146 * 0x0 is 14dB, 0x7 is 0dB
 147 *
 148 * Bit 3 controls treble attenuation/gain (sign)
 149 * 1 = gain (+)
 150 * 0 = attenuation (-)
 151 *
 152 * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
 153 * (This is only true for normal base range, set in 0x00)
 154 * 0x0 << 4 is 14dB, 0x7 is 0dB
 155 *
 156 * Bit 7 controls bass attenuation/gain (sign)
 157 * 1 << 7 = gain (+)
 158 * 0 << 7 = attenuation (-)
 159 *
 160 * Example:
 161 * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
 162 */
 163
 164#define TDA7432_TREBLE_0DB              0xf
 165#define TDA7432_TREBLE                  7
 166#define TDA7432_TREBLE_GAIN             1 << 3
 167#define TDA7432_BASS_0DB                0xf
 168#define TDA7432_BASS                    7 << 4
 169#define TDA7432_BASS_GAIN               1 << 7
 170
 171
 172/* Subaddress 0x03 - Left  Front attenuation */
 173/* Subaddress 0x04 - Left  Rear  attenuation */
 174/* Subaddress 0x05 - Right Front attenuation */
 175/* Subaddress 0x06 - Right Rear  attenuation */
 176
 177/* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
 178 * in 1.5dB steps.
 179 *
 180 * 0x00 is     0dB
 181 * 0x1f is -37.5dB
 182 *
 183 * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
 184 * We'll use the mute on the input, though (above)
 185 * Bits 6,7 unused
 186 */
 187
 188#define TDA7432_ATTEN_0DB       0x00
 189#define TDA7432_MUTE        0x1 << 5
 190
 191
 192/* Subaddress 0x07 - Loudness Control */
 193
 194/* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
 195 * when bit 4 is NOT set
 196 *
 197 * 0x0 is   0dB
 198 * 0xf is -15dB
 199 *
 200 * If bit 4 is set, then there is a flat attenuation according to
 201 * the lower 4 bits, as above.
 202 *
 203 * Bits 5,6,7 unused
 204 */
 205
 206
 207
 208/* Begin code */
 209
 210static int tda7432_write(struct v4l2_subdev *sd, int subaddr, int val)
 211{
 212        struct i2c_client *client = v4l2_get_subdevdata(sd);
 213        unsigned char buffer[2];
 214
 215        v4l2_dbg(2, debug, sd, "In tda7432_write\n");
 216        v4l2_dbg(1, debug, sd, "Writing %d 0x%x\n", subaddr, val);
 217        buffer[0] = subaddr;
 218        buffer[1] = val;
 219        if (2 != i2c_master_send(client, buffer, 2)) {
 220                v4l2_err(sd, "I/O error, trying (write %d 0x%x)\n",
 221                       subaddr, val);
 222                return -1;
 223        }
 224        return 0;
 225}
 226
 227static int tda7432_set(struct v4l2_subdev *sd)
 228{
 229        struct i2c_client *client = v4l2_get_subdevdata(sd);
 230        struct tda7432 *t = to_state(sd);
 231        unsigned char buf[16];
 232
 233        v4l2_dbg(1, debug, sd,
 234                "tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
 235                t->input, t->volume, t->bass, t->treble, t->lf, t->lr,
 236                t->rf, t->rr, t->loud);
 237        buf[0]  = TDA7432_IN;
 238        buf[1]  = t->input;
 239        buf[2]  = t->volume;
 240        buf[3]  = t->bass;
 241        buf[4]  = t->treble;
 242        buf[5]  = t->lf;
 243        buf[6]  = t->lr;
 244        buf[7]  = t->rf;
 245        buf[8]  = t->rr;
 246        buf[9]  = t->loud;
 247        if (10 != i2c_master_send(client, buf, 10)) {
 248                v4l2_err(sd, "I/O error, trying tda7432_set\n");
 249                return -1;
 250        }
 251
 252        return 0;
 253}
 254
 255static void do_tda7432_init(struct v4l2_subdev *sd)
 256{
 257        struct tda7432 *t = to_state(sd);
 258
 259        v4l2_dbg(2, debug, sd, "In tda7432_init\n");
 260
 261        t->input  = TDA7432_STEREO_IN |  /* Main (stereo) input   */
 262                    TDA7432_BASS_SYM  |  /* Symmetric bass cut    */
 263                    TDA7432_BASS_NORM;   /* Normal bass range     */
 264        t->volume =  0x3b ;                              /* -27dB Volume            */
 265        if (loudness)                    /* Turn loudness on?     */
 266                t->volume |= TDA7432_LD_ON;
 267        t->muted    = 1;
 268        t->treble   = TDA7432_TREBLE_0DB; /* 0dB Treble            */
 269        t->bass         = TDA7432_BASS_0DB;      /* 0dB Bass              */
 270        t->lf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 271        t->lr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 272        t->rf     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 273        t->rr     = TDA7432_ATTEN_0DB;   /* 0dB attenuation       */
 274        t->loud   = loudness;            /* insmod parameter      */
 275
 276        tda7432_set(sd);
 277}
 278
 279static int tda7432_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 280{
 281        struct tda7432 *t = to_state(sd);
 282
 283        switch (ctrl->id) {
 284        case V4L2_CID_AUDIO_MUTE:
 285                ctrl->value=t->muted;
 286                return 0;
 287        case V4L2_CID_AUDIO_VOLUME:
 288                if (!maxvol){  /* max +20db */
 289                        ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 630;
 290                } else {       /* max 0db   */
 291                        ctrl->value = ( 0x6f - (t->volume & 0x7F) ) * 829;
 292                }
 293                return 0;
 294        case V4L2_CID_AUDIO_BALANCE:
 295        {
 296                if ( (t->lf) < (t->rf) )
 297                        /* right is attenuated, balance shifted left */
 298                        ctrl->value = (32768 - 1057*(t->rf));
 299                else
 300                        /* left is attenuated, balance shifted right */
 301                        ctrl->value = (32768 + 1057*(t->lf));
 302                return 0;
 303        }
 304        case V4L2_CID_AUDIO_BASS:
 305        {
 306                /* Bass/treble 4 bits each */
 307                int bass=t->bass;
 308                if(bass >= 0x8)
 309                        bass = ~(bass - 0x8) & 0xf;
 310                ctrl->value = (bass << 12)+(bass << 8)+(bass << 4)+(bass);
 311                return 0;
 312        }
 313        case V4L2_CID_AUDIO_TREBLE:
 314        {
 315                int treble=t->treble;
 316                if(treble >= 0x8)
 317                        treble = ~(treble - 0x8) & 0xf;
 318                ctrl->value = (treble << 12)+(treble << 8)+(treble << 4)+(treble);
 319                return 0;
 320        }
 321        }
 322        return -EINVAL;
 323}
 324
 325static int tda7432_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 326{
 327        struct tda7432 *t = to_state(sd);
 328
 329        switch (ctrl->id) {
 330        case V4L2_CID_AUDIO_MUTE:
 331                t->muted=ctrl->value;
 332                break;
 333        case V4L2_CID_AUDIO_VOLUME:
 334                if(!maxvol){ /* max +20db */
 335                        t->volume = 0x6f - ((ctrl->value)/630);
 336                } else {    /* max 0db   */
 337                        t->volume = 0x6f - ((ctrl->value)/829);
 338                }
 339                if (loudness)           /* Turn on the loudness bit */
 340                        t->volume |= TDA7432_LD_ON;
 341
 342                tda7432_write(sd, TDA7432_VL, t->volume);
 343                return 0;
 344        case V4L2_CID_AUDIO_BALANCE:
 345                if (ctrl->value < 32768) {
 346                        /* shifted to left, attenuate right */
 347                        t->rr = (32768 - ctrl->value)/1057;
 348                        t->rf = t->rr;
 349                        t->lr = TDA7432_ATTEN_0DB;
 350                        t->lf = TDA7432_ATTEN_0DB;
 351                } else if(ctrl->value > 32769) {
 352                        /* shifted to right, attenuate left */
 353                        t->lf = (ctrl->value - 32768)/1057;
 354                        t->lr = t->lf;
 355                        t->rr = TDA7432_ATTEN_0DB;
 356                        t->rf = TDA7432_ATTEN_0DB;
 357                } else {
 358                        /* centered */
 359                        t->rr = TDA7432_ATTEN_0DB;
 360                        t->rf = TDA7432_ATTEN_0DB;
 361                        t->lf = TDA7432_ATTEN_0DB;
 362                        t->lr = TDA7432_ATTEN_0DB;
 363                }
 364                break;
 365        case V4L2_CID_AUDIO_BASS:
 366                t->bass = ctrl->value >> 12;
 367                if(t->bass>= 0x8)
 368                                t->bass = (~t->bass & 0xf) + 0x8 ;
 369
 370                tda7432_write(sd, TDA7432_TN, 0x10 | (t->bass << 4) | t->treble);
 371                return 0;
 372        case V4L2_CID_AUDIO_TREBLE:
 373                t->treble= ctrl->value >> 12;
 374                if(t->treble>= 0x8)
 375                                t->treble = (~t->treble & 0xf) + 0x8 ;
 376
 377                tda7432_write(sd, TDA7432_TN, 0x10 | (t->bass << 4) | t->treble);
 378                return 0;
 379        default:
 380                return -EINVAL;
 381        }
 382
 383        /* Used for both mute and balance changes */
 384        if (t->muted)
 385        {
 386                /* Mute & update balance*/
 387                tda7432_write(sd, TDA7432_LF, t->lf | TDA7432_MUTE);
 388                tda7432_write(sd, TDA7432_LR, t->lr | TDA7432_MUTE);
 389                tda7432_write(sd, TDA7432_RF, t->rf | TDA7432_MUTE);
 390                tda7432_write(sd, TDA7432_RR, t->rr | TDA7432_MUTE);
 391        } else {
 392                tda7432_write(sd, TDA7432_LF, t->lf);
 393                tda7432_write(sd, TDA7432_LR, t->lr);
 394                tda7432_write(sd, TDA7432_RF, t->rf);
 395                tda7432_write(sd, TDA7432_RR, t->rr);
 396        }
 397        return 0;
 398}
 399
 400static int tda7432_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 401{
 402        switch (qc->id) {
 403        case V4L2_CID_AUDIO_VOLUME:
 404                return v4l2_ctrl_query_fill(qc, 0, 65535, 65535 / 100, 58880);
 405        case V4L2_CID_AUDIO_MUTE:
 406                return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
 407        case V4L2_CID_AUDIO_BALANCE:
 408        case V4L2_CID_AUDIO_BASS:
 409        case V4L2_CID_AUDIO_TREBLE:
 410                return v4l2_ctrl_query_fill(qc, 0, 65535, 65535 / 100, 32768);
 411        }
 412        return -EINVAL;
 413}
 414
 415/* ----------------------------------------------------------------------- */
 416
 417static const struct v4l2_subdev_core_ops tda7432_core_ops = {
 418        .queryctrl = tda7432_queryctrl,
 419        .g_ctrl = tda7432_g_ctrl,
 420        .s_ctrl = tda7432_s_ctrl,
 421};
 422
 423static const struct v4l2_subdev_ops tda7432_ops = {
 424        .core = &tda7432_core_ops,
 425};
 426
 427/* ----------------------------------------------------------------------- */
 428
 429/* *********************** *
 430 * i2c interface functions *
 431 * *********************** */
 432
 433static int tda7432_probe(struct i2c_client *client,
 434                        const struct i2c_device_id *id)
 435{
 436        struct tda7432 *t;
 437        struct v4l2_subdev *sd;
 438
 439        v4l_info(client, "chip found @ 0x%02x (%s)\n",
 440                        client->addr << 1, client->adapter->name);
 441
 442        t = kzalloc(sizeof(*t), GFP_KERNEL);
 443        if (!t)
 444                return -ENOMEM;
 445        sd = &t->sd;
 446        v4l2_i2c_subdev_init(sd, client, &tda7432_ops);
 447        if (loudness < 0 || loudness > 15) {
 448                v4l2_warn(sd, "loudness parameter must be between 0 and 15\n");
 449                if (loudness < 0)
 450                        loudness = 0;
 451                if (loudness > 15)
 452                        loudness = 15;
 453        }
 454
 455        do_tda7432_init(sd);
 456        return 0;
 457}
 458
 459static int tda7432_remove(struct i2c_client *client)
 460{
 461        struct v4l2_subdev *sd = i2c_get_clientdata(client);
 462
 463        do_tda7432_init(sd);
 464        v4l2_device_unregister_subdev(sd);
 465        kfree(to_state(sd));
 466        return 0;
 467}
 468
 469static const struct i2c_device_id tda7432_id[] = {
 470        { "tda7432", 0 },
 471        { }
 472};
 473MODULE_DEVICE_TABLE(i2c, tda7432_id);
 474
 475static struct i2c_driver tda7432_driver = {
 476        .driver = {
 477                .owner  = THIS_MODULE,
 478                .name   = "tda7432",
 479        },
 480        .probe          = tda7432_probe,
 481        .remove         = tda7432_remove,
 482        .id_table       = tda7432_id,
 483};
 484
 485module_i2c_driver(tda7432_driver);
 486