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/v4l2-ctrls.h> 39#include <media/i2c-addr.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_PARM_DESC(debug, "Set debugging level from 0 to 3. Default is off(0)."); 54module_param(loudness, int, S_IRUGO); 55MODULE_PARM_DESC(loudness, "Turn loudness on(1) else off(0). Default is off(0)."); 56module_param(maxvol, int, S_IRUGO | S_IWUSR); 57MODULE_PARM_DESC(maxvol, "Set maximium volume to +20dB(0) else +0dB(1). Default is +20dB(0)."); 58 59 60/* Structure of address and subaddresses for the tda7432 */ 61 62struct tda7432 { 63 struct v4l2_subdev sd; 64 struct v4l2_ctrl_handler hdl; 65 struct { 66 /* bass/treble cluster */ 67 struct v4l2_ctrl *bass; 68 struct v4l2_ctrl *treble; 69 }; 70 struct { 71 /* mute/balance cluster */ 72 struct v4l2_ctrl *mute; 73 struct v4l2_ctrl *balance; 74 }; 75}; 76 77static inline struct tda7432 *to_state(struct v4l2_subdev *sd) 78{ 79 return container_of(sd, struct tda7432, sd); 80} 81 82static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 83{ 84 return &container_of(ctrl->handler, struct tda7432, hdl)->sd; 85} 86 87/* The TDA7432 is made by STS-Thompson 88 * http://www.st.com 89 * http://us.st.com/stonline/books/pdf/docs/4056.pdf 90 * 91 * TDA7432: I2C-bus controlled basic audio processor 92 * 93 * The TDA7432 controls basic audio functions like volume, balance, 94 * and tone control (including loudness). It also has four channel 95 * output (for front and rear). Since most vidcap cards probably 96 * don't have 4 channel output, this driver will set front & rear 97 * together (no independent control). 98 */ 99 100 /* Subaddresses for TDA7432 */ 101 102#define TDA7432_IN 0x00 /* Input select */ 103#define TDA7432_VL 0x01 /* Volume */ 104#define TDA7432_TN 0x02 /* Bass, Treble (Tone) */ 105#define TDA7432_LF 0x03 /* Attenuation LF (Left Front) */ 106#define TDA7432_LR 0x04 /* Attenuation LR (Left Rear) */ 107#define TDA7432_RF 0x05 /* Attenuation RF (Right Front) */ 108#define TDA7432_RR 0x06 /* Attenuation RR (Right Rear) */ 109#define TDA7432_LD 0x07 /* Loudness */ 110 111 112 /* Masks for bits in TDA7432 subaddresses */ 113 114/* Many of these not used - just for documentation */ 115 116/* Subaddress 0x00 - Input selection and bass control */ 117 118/* Bits 0,1,2 control input: 119 * 0x00 - Stereo input 120 * 0x02 - Mono input 121 * 0x03 - Mute (Using Attenuators Plays better with modules) 122 * Mono probably isn't used - I'm guessing only the stereo 123 * input is connected on most cards, so we'll set it to stereo. 124 * 125 * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut 126 * Bit 4 controls bass range: 0/1 is extended/standard bass range 127 * 128 * Highest 3 bits not used 129 */ 130 131#define TDA7432_STEREO_IN 0 132#define TDA7432_MONO_IN 2 /* Probably won't be used */ 133#define TDA7432_BASS_SYM 1 << 3 134#define TDA7432_BASS_NORM 1 << 4 135 136/* Subaddress 0x01 - Volume */ 137 138/* Lower 7 bits control volume from -79dB to +32dB in 1dB steps 139 * Recommended maximum is +20 dB 140 * 141 * +32dB: 0x00 142 * +20dB: 0x0c 143 * 0dB: 0x20 144 * -79dB: 0x6f 145 * 146 * MSB (bit 7) controls loudness: 1/0 is loudness on/off 147 */ 148 149#define TDA7432_VOL_0DB 0x20 150#define TDA7432_LD_ON 1 << 7 151 152 153/* Subaddress 0x02 - Tone control */ 154 155/* Bits 0,1,2 control absolute treble gain from 0dB to 14dB 156 * 0x0 is 14dB, 0x7 is 0dB 157 * 158 * Bit 3 controls treble attenuation/gain (sign) 159 * 1 = gain (+) 160 * 0 = attenuation (-) 161 * 162 * Bits 4,5,6 control absolute bass gain from 0dB to 14dB 163 * (This is only true for normal base range, set in 0x00) 164 * 0x0 << 4 is 14dB, 0x7 is 0dB 165 * 166 * Bit 7 controls bass attenuation/gain (sign) 167 * 1 << 7 = gain (+) 168 * 0 << 7 = attenuation (-) 169 * 170 * Example: 171 * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble 172 */ 173 174#define TDA7432_TREBLE_0DB 0xf 175#define TDA7432_TREBLE 7 176#define TDA7432_TREBLE_GAIN 1 << 3 177#define TDA7432_BASS_0DB 0xf 178#define TDA7432_BASS 7 << 4 179#define TDA7432_BASS_GAIN 1 << 7 180 181 182/* Subaddress 0x03 - Left Front attenuation */ 183/* Subaddress 0x04 - Left Rear attenuation */ 184/* Subaddress 0x05 - Right Front attenuation */ 185/* Subaddress 0x06 - Right Rear attenuation */ 186 187/* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB 188 * in 1.5dB steps. 189 * 190 * 0x00 is 0dB 191 * 0x1f is -37.5dB 192 * 193 * Bit 5 mutes that channel when set (1 = mute, 0 = unmute) 194 * We'll use the mute on the input, though (above) 195 * Bits 6,7 unused 196 */ 197 198#define TDA7432_ATTEN_0DB 0x00 199#define TDA7432_MUTE 0x1 << 5 200 201 202/* Subaddress 0x07 - Loudness Control */ 203 204/* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps 205 * when bit 4 is NOT set 206 * 207 * 0x0 is 0dB 208 * 0xf is -15dB 209 * 210 * If bit 4 is set, then there is a flat attenuation according to 211 * the lower 4 bits, as above. 212 * 213 * Bits 5,6,7 unused 214 */ 215 216 217 218/* Begin code */ 219 220static int tda7432_write(struct v4l2_subdev *sd, int subaddr, int val) 221{ 222 struct i2c_client *client = v4l2_get_subdevdata(sd); 223 unsigned char buffer[2]; 224 225 v4l2_dbg(2, debug, sd, "In tda7432_write\n"); 226 v4l2_dbg(1, debug, sd, "Writing %d 0x%x\n", subaddr, val); 227 buffer[0] = subaddr; 228 buffer[1] = val; 229 if (2 != i2c_master_send(client, buffer, 2)) { 230 v4l2_err(sd, "I/O error, trying (write %d 0x%x)\n", 231 subaddr, val); 232 return -1; 233 } 234 return 0; 235} 236 237static int tda7432_set(struct v4l2_subdev *sd) 238{ 239 struct i2c_client *client = v4l2_get_subdevdata(sd); 240 unsigned char buf[16]; 241 242 buf[0] = TDA7432_IN; 243 buf[1] = TDA7432_STEREO_IN | /* Main (stereo) input */ 244 TDA7432_BASS_SYM | /* Symmetric bass cut */ 245 TDA7432_BASS_NORM; /* Normal bass range */ 246 buf[2] = 0x3b; 247 if (loudness) /* Turn loudness on? */ 248 buf[2] |= TDA7432_LD_ON; 249 buf[3] = TDA7432_TREBLE_0DB | (TDA7432_BASS_0DB << 4); 250 buf[4] = TDA7432_ATTEN_0DB; 251 buf[5] = TDA7432_ATTEN_0DB; 252 buf[6] = TDA7432_ATTEN_0DB; 253 buf[7] = TDA7432_ATTEN_0DB; 254 buf[8] = loudness; 255 if (9 != i2c_master_send(client, buf, 9)) { 256 v4l2_err(sd, "I/O error, trying tda7432_set\n"); 257 return -1; 258 } 259 260 return 0; 261} 262 263static int tda7432_log_status(struct v4l2_subdev *sd) 264{ 265 struct tda7432 *state = to_state(sd); 266 267 v4l2_ctrl_handler_log_status(&state->hdl, sd->name); 268 return 0; 269} 270 271static int tda7432_s_ctrl(struct v4l2_ctrl *ctrl) 272{ 273 struct v4l2_subdev *sd = to_sd(ctrl); 274 struct tda7432 *t = to_state(sd); 275 u8 bass, treble, volume; 276 u8 lf, lr, rf, rr; 277 278 switch (ctrl->id) { 279 case V4L2_CID_AUDIO_MUTE: 280 if (t->balance->val < 0) { 281 /* shifted to left, attenuate right */ 282 rr = rf = -t->balance->val; 283 lr = lf = TDA7432_ATTEN_0DB; 284 } else if (t->balance->val > 0) { 285 /* shifted to right, attenuate left */ 286 rr = rf = TDA7432_ATTEN_0DB; 287 lr = lf = t->balance->val; 288 } else { 289 /* centered */ 290 rr = rf = TDA7432_ATTEN_0DB; 291 lr = lf = TDA7432_ATTEN_0DB; 292 } 293 if (t->mute->val) { 294 lf |= TDA7432_MUTE; 295 lr |= TDA7432_MUTE; 296 rf |= TDA7432_MUTE; 297 rr |= TDA7432_MUTE; 298 } 299 /* Mute & update balance*/ 300 tda7432_write(sd, TDA7432_LF, lf); 301 tda7432_write(sd, TDA7432_LR, lr); 302 tda7432_write(sd, TDA7432_RF, rf); 303 tda7432_write(sd, TDA7432_RR, rr); 304 return 0; 305 case V4L2_CID_AUDIO_VOLUME: 306 volume = 0x6f - ctrl->val; 307 if (loudness) /* Turn on the loudness bit */ 308 volume |= TDA7432_LD_ON; 309 310 tda7432_write(sd, TDA7432_VL, volume); 311 return 0; 312 case V4L2_CID_AUDIO_BASS: 313 bass = t->bass->val; 314 treble = t->treble->val; 315 if (bass >= 0x8) 316 bass = 14 - (bass - 8); 317 if (treble >= 0x8) 318 treble = 14 - (treble - 8); 319 320 tda7432_write(sd, TDA7432_TN, 0x10 | (bass << 4) | treble); 321 return 0; 322 } 323 return -EINVAL; 324} 325 326/* ----------------------------------------------------------------------- */ 327 328static const struct v4l2_ctrl_ops tda7432_ctrl_ops = { 329 .s_ctrl = tda7432_s_ctrl, 330}; 331 332static const struct v4l2_subdev_core_ops tda7432_core_ops = { 333 .log_status = tda7432_log_status, 334}; 335 336static const struct v4l2_subdev_ops tda7432_ops = { 337 .core = &tda7432_core_ops, 338}; 339 340/* ----------------------------------------------------------------------- */ 341 342/* *********************** * 343 * i2c interface functions * 344 * *********************** */ 345 346static int tda7432_probe(struct i2c_client *client, 347 const struct i2c_device_id *id) 348{ 349 struct tda7432 *t; 350 struct v4l2_subdev *sd; 351 352 v4l_info(client, "chip found @ 0x%02x (%s)\n", 353 client->addr << 1, client->adapter->name); 354 355 t = devm_kzalloc(&client->dev, sizeof(*t), GFP_KERNEL); 356 if (!t) 357 return -ENOMEM; 358 sd = &t->sd; 359 v4l2_i2c_subdev_init(sd, client, &tda7432_ops); 360 v4l2_ctrl_handler_init(&t->hdl, 5); 361 v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 362 V4L2_CID_AUDIO_VOLUME, 0, maxvol ? 0x68 : 0x4f, 1, maxvol ? 0x5d : 0x47); 363 t->mute = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 364 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 365 t->balance = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 366 V4L2_CID_AUDIO_BALANCE, -31, 31, 1, 0); 367 t->bass = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 368 V4L2_CID_AUDIO_BASS, 0, 14, 1, 7); 369 t->treble = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 370 V4L2_CID_AUDIO_TREBLE, 0, 14, 1, 7); 371 sd->ctrl_handler = &t->hdl; 372 if (t->hdl.error) { 373 int err = t->hdl.error; 374 375 v4l2_ctrl_handler_free(&t->hdl); 376 return err; 377 } 378 v4l2_ctrl_cluster(2, &t->bass); 379 v4l2_ctrl_cluster(2, &t->mute); 380 v4l2_ctrl_handler_setup(&t->hdl); 381 if (loudness < 0 || loudness > 15) { 382 v4l2_warn(sd, "loudness parameter must be between 0 and 15\n"); 383 if (loudness < 0) 384 loudness = 0; 385 if (loudness > 15) 386 loudness = 15; 387 } 388 389 tda7432_set(sd); 390 return 0; 391} 392 393static int tda7432_remove(struct i2c_client *client) 394{ 395 struct v4l2_subdev *sd = i2c_get_clientdata(client); 396 struct tda7432 *t = to_state(sd); 397 398 tda7432_set(sd); 399 v4l2_device_unregister_subdev(sd); 400 v4l2_ctrl_handler_free(&t->hdl); 401 return 0; 402} 403 404static const struct i2c_device_id tda7432_id[] = { 405 { "tda7432", 0 }, 406 { } 407}; 408MODULE_DEVICE_TABLE(i2c, tda7432_id); 409 410static struct i2c_driver tda7432_driver = { 411 .driver = { 412 .name = "tda7432", 413 }, 414 .probe = tda7432_probe, 415 .remove = tda7432_remove, 416 .id_table = tda7432_id, 417}; 418 419module_i2c_driver(tda7432_driver); 420