1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * For the STS-Thompson TDA7432 audio processor chip 4 * 5 * Handles audio functions: volume, balance, tone, loudness 6 * This driver will not complain if used with any 7 * other i2c device with the same address. 8 * 9 * Muting and tone control by Jonathan Isom <jisom@ematic.com> 10 * 11 * Copyright (c) 2000 Eric Sandeen <eric_sandeen@bigfoot.com> 12 * Copyright (c) 2006 Mauro Carvalho Chehab <mchehab@kernel.org> 13 * 14 * Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu) 15 * Which was based on tda8425.c by Greg Alexander (c) 1998 16 * 17 * OPTIONS: 18 * debug - set to 1 if you'd like to see debug messages 19 * set to 2 if you'd like to be inundated with debug messages 20 * 21 * loudness - set between 0 and 15 for varying degrees of loudness effect 22 * 23 * maxvol - set maximum volume to +20db (1), default is 0db(0) 24 */ 25 26 #include <linux/module.h> 27 #include <linux/init.h> 28 #include <linux/kernel.h> 29 #include <linux/string.h> 30 #include <linux/timer.h> 31 #include <linux/delay.h> 32 #include <linux/errno.h> 33 #include <linux/slab.h> 34 #include <linux/videodev2.h> 35 #include <linux/i2c.h> 36 37 #include <media/v4l2-device.h> 38 #include <media/v4l2-ioctl.h> 39 #include <media/v4l2-ctrls.h> 40 41 #ifndef VIDEO_AUDIO_BALANCE 42 # define VIDEO_AUDIO_BALANCE 32 43 #endif 44 45 MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>"); 46 MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip"); 47 MODULE_LICENSE("GPL"); 48 49 static int maxvol; 50 static int loudness; /* disable loudness by default */ 51 static int debug; /* insmod parameter */ 52 module_param(debug, int, S_IRUGO | S_IWUSR); 53 MODULE_PARM_DESC(debug, "Set debugging level from 0 to 3. Default is off(0)."); 54 module_param(loudness, int, S_IRUGO); 55 MODULE_PARM_DESC(loudness, "Turn loudness on(1) else off(0). Default is off(0)."); 56 module_param(maxvol, int, S_IRUGO | S_IWUSR); 57 MODULE_PARM_DESC(maxvol, "Set maximum volume to +20dB(0) else +0dB(1). Default is +20dB(0)."); 58 59 60 /* Structure of address and subaddresses for the tda7432 */ 61 62 struct 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 77 static inline struct tda7432 *to_state(struct v4l2_subdev *sd) 78 { 79 return container_of(sd, struct tda7432, sd); 80 } 81 82 static 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 */ 219 220 static 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 } 236 237 static 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 } 262 263 static 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 } 270 271 static 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 /* ----------------------------------------------------------------------- */ 327 328 static const struct v4l2_ctrl_ops tda7432_ctrl_ops = { 329 .s_ctrl = tda7432_s_ctrl, 330 }; 331 332 static const struct v4l2_subdev_core_ops tda7432_core_ops = { 333 .log_status = tda7432_log_status, 334 }; 335 336 static const struct v4l2_subdev_ops tda7432_ops = { 337 .core = &tda7432_core_ops, 338 }; 339 340 /* ----------------------------------------------------------------------- */ 341 342 /* *********************** * 343 * i2c interface functions * 344 * *********************** */ 345 346 static int tda7432_probe(struct i2c_client *client) 347 { 348 struct tda7432 *t; 349 struct v4l2_subdev *sd; 350 351 v4l_info(client, "chip found @ 0x%02x (%s)\n", 352 client->addr << 1, client->adapter->name); 353 354 t = devm_kzalloc(&client->dev, sizeof(*t), GFP_KERNEL); 355 if (!t) 356 return -ENOMEM; 357 sd = &t->sd; 358 v4l2_i2c_subdev_init(sd, client, &tda7432_ops); 359 v4l2_ctrl_handler_init(&t->hdl, 5); 360 v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 361 V4L2_CID_AUDIO_VOLUME, 0, maxvol ? 0x68 : 0x4f, 1, maxvol ? 0x5d : 0x47); 362 t->mute = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 363 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 364 t->balance = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 365 V4L2_CID_AUDIO_BALANCE, -31, 31, 1, 0); 366 t->bass = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 367 V4L2_CID_AUDIO_BASS, 0, 14, 1, 7); 368 t->treble = v4l2_ctrl_new_std(&t->hdl, &tda7432_ctrl_ops, 369 V4L2_CID_AUDIO_TREBLE, 0, 14, 1, 7); 370 sd->ctrl_handler = &t->hdl; 371 if (t->hdl.error) { 372 int err = t->hdl.error; 373 374 v4l2_ctrl_handler_free(&t->hdl); 375 return err; 376 } 377 v4l2_ctrl_cluster(2, &t->bass); 378 v4l2_ctrl_cluster(2, &t->mute); 379 v4l2_ctrl_handler_setup(&t->hdl); 380 if (loudness < 0 || loudness > 15) { 381 v4l2_warn(sd, "loudness parameter must be between 0 and 15\n"); 382 if (loudness < 0) 383 loudness = 0; 384 if (loudness > 15) 385 loudness = 15; 386 } 387 388 tda7432_set(sd); 389 return 0; 390 } 391 392 static void tda7432_remove(struct i2c_client *client) 393 { 394 struct v4l2_subdev *sd = i2c_get_clientdata(client); 395 struct tda7432 *t = to_state(sd); 396 397 tda7432_set(sd); 398 v4l2_device_unregister_subdev(sd); 399 v4l2_ctrl_handler_free(&t->hdl); 400 } 401 402 static const struct i2c_device_id tda7432_id[] = { 403 { "tda7432", 0 }, 404 { } 405 }; 406 MODULE_DEVICE_TABLE(i2c, tda7432_id); 407 408 static struct i2c_driver tda7432_driver = { 409 .driver = { 410 .name = "tda7432", 411 }, 412 .probe = tda7432_probe, 413 .remove = tda7432_remove, 414 .id_table = tda7432_id, 415 }; 416 417 module_i2c_driver(tda7432_driver); 418