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#include <media/v4l2-i2c-drv.h> 40 41#ifndef VIDEO_AUDIO_BALANCE 42# define VIDEO_AUDIO_BALANCE 32 43#endif 44 45MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>"); 46MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip"); 47MODULE_LICENSE("GPL"); 48 49static int maxvol; 50static int loudness; /* disable loudness by default */ 51static int debug; /* insmod parameter */ 52module_param(debug, int, S_IRUGO | S_IWUSR); 53module_param(loudness, int, S_IRUGO); 54MODULE_PARM_DESC(maxvol,"Set maximium volume to +20db (0), default is 0db(1)"); 55module_param(maxvol, int, S_IRUGO | S_IWUSR); 56 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 v4l2_i2c_driver_data v4l2_i2c_data = { 476 .name = "tda7432", 477 .probe = tda7432_probe, 478 .remove = tda7432_remove, 479 .id_table = tda7432_id, 480}; 481