1 /* 2 * CS4270 ALSA SoC (ASoC) codec driver 3 * 4 * Author: Timur Tabi <timur@freescale.com> 5 * 6 * Copyright 2007-2009 Freescale Semiconductor, Inc. This file is licensed 7 * under the terms of the GNU General Public License version 2. This 8 * program is licensed "as is" without any warranty of any kind, whether 9 * express or implied. 10 * 11 * This is an ASoC device driver for the Cirrus Logic CS4270 codec. 12 * 13 * Current features/limitations: 14 * 15 * - Software mode is supported. Stand-alone mode is not supported. 16 * - Only I2C is supported, not SPI 17 * - Support for master and slave mode 18 * - The machine driver's 'startup' function must call 19 * cs4270_set_dai_sysclk() with the value of MCLK. 20 * - Only I2S and left-justified modes are supported 21 * - Power management is supported 22 */ 23 24 #include <linux/module.h> 25 #include <linux/platform_device.h> 26 #include <sound/core.h> 27 #include <sound/soc.h> 28 #include <sound/initval.h> 29 #include <linux/i2c.h> 30 #include <linux/delay.h> 31 #include <linux/regulator/consumer.h> 32 33 #include "cs4270.h" 34 35 /* 36 * The codec isn't really big-endian or little-endian, since the I2S 37 * interface requires data to be sent serially with the MSbit first. 38 * However, to support BE and LE I2S devices, we specify both here. That 39 * way, ALSA will always match the bit patterns. 40 */ 41 #define CS4270_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ 42 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \ 43 SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \ 44 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \ 45 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \ 46 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE) 47 48 /* CS4270 registers addresses */ 49 #define CS4270_CHIPID 0x01 /* Chip ID */ 50 #define CS4270_PWRCTL 0x02 /* Power Control */ 51 #define CS4270_MODE 0x03 /* Mode Control */ 52 #define CS4270_FORMAT 0x04 /* Serial Format, ADC/DAC Control */ 53 #define CS4270_TRANS 0x05 /* Transition Control */ 54 #define CS4270_MUTE 0x06 /* Mute Control */ 55 #define CS4270_VOLA 0x07 /* DAC Channel A Volume Control */ 56 #define CS4270_VOLB 0x08 /* DAC Channel B Volume Control */ 57 58 #define CS4270_FIRSTREG 0x01 59 #define CS4270_LASTREG 0x08 60 #define CS4270_NUMREGS (CS4270_LASTREG - CS4270_FIRSTREG + 1) 61 #define CS4270_I2C_INCR 0x80 62 63 /* Bit masks for the CS4270 registers */ 64 #define CS4270_CHIPID_ID 0xF0 65 #define CS4270_CHIPID_REV 0x0F 66 #define CS4270_PWRCTL_FREEZE 0x80 67 #define CS4270_PWRCTL_PDN_ADC 0x20 68 #define CS4270_PWRCTL_PDN_DAC 0x02 69 #define CS4270_PWRCTL_PDN 0x01 70 #define CS4270_PWRCTL_PDN_ALL \ 71 (CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC | CS4270_PWRCTL_PDN) 72 #define CS4270_MODE_SPEED_MASK 0x30 73 #define CS4270_MODE_1X 0x00 74 #define CS4270_MODE_2X 0x10 75 #define CS4270_MODE_4X 0x20 76 #define CS4270_MODE_SLAVE 0x30 77 #define CS4270_MODE_DIV_MASK 0x0E 78 #define CS4270_MODE_DIV1 0x00 79 #define CS4270_MODE_DIV15 0x02 80 #define CS4270_MODE_DIV2 0x04 81 #define CS4270_MODE_DIV3 0x06 82 #define CS4270_MODE_DIV4 0x08 83 #define CS4270_MODE_POPGUARD 0x01 84 #define CS4270_FORMAT_FREEZE_A 0x80 85 #define CS4270_FORMAT_FREEZE_B 0x40 86 #define CS4270_FORMAT_LOOPBACK 0x20 87 #define CS4270_FORMAT_DAC_MASK 0x18 88 #define CS4270_FORMAT_DAC_LJ 0x00 89 #define CS4270_FORMAT_DAC_I2S 0x08 90 #define CS4270_FORMAT_DAC_RJ16 0x18 91 #define CS4270_FORMAT_DAC_RJ24 0x10 92 #define CS4270_FORMAT_ADC_MASK 0x01 93 #define CS4270_FORMAT_ADC_LJ 0x00 94 #define CS4270_FORMAT_ADC_I2S 0x01 95 #define CS4270_TRANS_ONE_VOL 0x80 96 #define CS4270_TRANS_SOFT 0x40 97 #define CS4270_TRANS_ZERO 0x20 98 #define CS4270_TRANS_INV_ADC_A 0x08 99 #define CS4270_TRANS_INV_ADC_B 0x10 100 #define CS4270_TRANS_INV_DAC_A 0x02 101 #define CS4270_TRANS_INV_DAC_B 0x04 102 #define CS4270_TRANS_DEEMPH 0x01 103 #define CS4270_MUTE_AUTO 0x20 104 #define CS4270_MUTE_ADC_A 0x08 105 #define CS4270_MUTE_ADC_B 0x10 106 #define CS4270_MUTE_POLARITY 0x04 107 #define CS4270_MUTE_DAC_A 0x01 108 #define CS4270_MUTE_DAC_B 0x02 109 110 static const char *supply_names[] = { 111 "va", "vd", "vlc" 112 }; 113 114 /* Private data for the CS4270 */ 115 struct cs4270_private { 116 struct snd_soc_codec codec; 117 u8 reg_cache[CS4270_NUMREGS]; 118 unsigned int mclk; /* Input frequency of the MCLK pin */ 119 unsigned int mode; /* The mode (I2S or left-justified) */ 120 unsigned int slave_mode; 121 unsigned int manual_mute; 122 123 /* power domain regulators */ 124 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; 125 }; 126 127 /** 128 * struct cs4270_mode_ratios - clock ratio tables 129 * @ratio: the ratio of MCLK to the sample rate 130 * @speed_mode: the Speed Mode bits to set in the Mode Control register for 131 * this ratio 132 * @mclk: the Ratio Select bits to set in the Mode Control register for this 133 * ratio 134 * 135 * The data for this chart is taken from Table 5 of the CS4270 reference 136 * manual. 137 * 138 * This table is used to determine how to program the Mode Control register. 139 * It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling 140 * rates the CS4270 currently supports. 141 * 142 * @speed_mode is the corresponding bit pattern to be written to the 143 * MODE bits of the Mode Control Register 144 * 145 * @mclk is the corresponding bit pattern to be wirten to the MCLK bits of 146 * the Mode Control Register. 147 * 148 * In situations where a single ratio is represented by multiple speed 149 * modes, we favor the slowest speed. E.g, for a ratio of 128, we pick 150 * double-speed instead of quad-speed. However, the CS4270 errata states 151 * that divide-By-1.5 can cause failures, so we avoid that mode where 152 * possible. 153 * 154 * Errata: There is an errata for the CS4270 where divide-by-1.5 does not 155 * work if Vd is 3.3V. If this effects you, select the 156 * CONFIG_SND_SOC_CS4270_VD33_ERRATA Kconfig option, and the driver will 157 * never select any sample rates that require divide-by-1.5. 158 */ 159 struct cs4270_mode_ratios { 160 unsigned int ratio; 161 u8 speed_mode; 162 u8 mclk; 163 }; 164 165 static struct cs4270_mode_ratios cs4270_mode_ratios[] = { 166 {64, CS4270_MODE_4X, CS4270_MODE_DIV1}, 167 #ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA 168 {96, CS4270_MODE_4X, CS4270_MODE_DIV15}, 169 #endif 170 {128, CS4270_MODE_2X, CS4270_MODE_DIV1}, 171 {192, CS4270_MODE_4X, CS4270_MODE_DIV3}, 172 {256, CS4270_MODE_1X, CS4270_MODE_DIV1}, 173 {384, CS4270_MODE_2X, CS4270_MODE_DIV3}, 174 {512, CS4270_MODE_1X, CS4270_MODE_DIV2}, 175 {768, CS4270_MODE_1X, CS4270_MODE_DIV3}, 176 {1024, CS4270_MODE_1X, CS4270_MODE_DIV4} 177 }; 178 179 /* The number of MCLK/LRCK ratios supported by the CS4270 */ 180 #define NUM_MCLK_RATIOS ARRAY_SIZE(cs4270_mode_ratios) 181 182 /** 183 * cs4270_set_dai_sysclk - determine the CS4270 samples rates. 184 * @codec_dai: the codec DAI 185 * @clk_id: the clock ID (ignored) 186 * @freq: the MCLK input frequency 187 * @dir: the clock direction (ignored) 188 * 189 * This function is used to tell the codec driver what the input MCLK 190 * frequency is. 191 * 192 * The value of MCLK is used to determine which sample rates are supported 193 * by the CS4270. The ratio of MCLK / Fs must be equal to one of nine 194 * supported values - 64, 96, 128, 192, 256, 384, 512, 768, and 1024. 195 * 196 * This function calculates the nine ratios and determines which ones match 197 * a standard sample rate. If there's a match, then it is added to the list 198 * of supported sample rates. 199 * 200 * This function must be called by the machine driver's 'startup' function, 201 * otherwise the list of supported sample rates will not be available in 202 * time for ALSA. 203 * 204 * For setups with variable MCLKs, pass 0 as 'freq' argument. This will cause 205 * theoretically possible sample rates to be enabled. Call it again with a 206 * proper value set one the external clock is set (most probably you would do 207 * that from a machine's driver 'hw_param' hook. 208 */ 209 static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai, 210 int clk_id, unsigned int freq, int dir) 211 { 212 struct snd_soc_codec *codec = codec_dai->codec; 213 struct cs4270_private *cs4270 = codec->private_data; 214 unsigned int rates = 0; 215 unsigned int rate_min = -1; 216 unsigned int rate_max = 0; 217 unsigned int i; 218 219 cs4270->mclk = freq; 220 221 if (cs4270->mclk) { 222 for (i = 0; i < NUM_MCLK_RATIOS; i++) { 223 unsigned int rate = freq / cs4270_mode_ratios[i].ratio; 224 rates |= snd_pcm_rate_to_rate_bit(rate); 225 if (rate < rate_min) 226 rate_min = rate; 227 if (rate > rate_max) 228 rate_max = rate; 229 } 230 /* FIXME: soc should support a rate list */ 231 rates &= ~SNDRV_PCM_RATE_KNOT; 232 233 if (!rates) { 234 dev_err(codec->dev, "could not find a valid sample rate\n"); 235 return -EINVAL; 236 } 237 } else { 238 /* enable all possible rates */ 239 rates = SNDRV_PCM_RATE_8000_192000; 240 rate_min = 8000; 241 rate_max = 192000; 242 } 243 244 codec_dai->playback.rates = rates; 245 codec_dai->playback.rate_min = rate_min; 246 codec_dai->playback.rate_max = rate_max; 247 248 codec_dai->capture.rates = rates; 249 codec_dai->capture.rate_min = rate_min; 250 codec_dai->capture.rate_max = rate_max; 251 252 return 0; 253 } 254 255 /** 256 * cs4270_set_dai_fmt - configure the codec for the selected audio format 257 * @codec_dai: the codec DAI 258 * @format: a SND_SOC_DAIFMT_x value indicating the data format 259 * 260 * This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the 261 * codec accordingly. 262 * 263 * Currently, this function only supports SND_SOC_DAIFMT_I2S and 264 * SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified 265 * data for playback only, but ASoC currently does not support different 266 * formats for playback vs. record. 267 */ 268 static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai, 269 unsigned int format) 270 { 271 struct snd_soc_codec *codec = codec_dai->codec; 272 struct cs4270_private *cs4270 = codec->private_data; 273 int ret = 0; 274 275 /* set DAI format */ 276 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 277 case SND_SOC_DAIFMT_I2S: 278 case SND_SOC_DAIFMT_LEFT_J: 279 cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK; 280 break; 281 default: 282 dev_err(codec->dev, "invalid dai format\n"); 283 ret = -EINVAL; 284 } 285 286 /* set master/slave audio interface */ 287 switch (format & SND_SOC_DAIFMT_MASTER_MASK) { 288 case SND_SOC_DAIFMT_CBS_CFS: 289 cs4270->slave_mode = 1; 290 break; 291 case SND_SOC_DAIFMT_CBM_CFM: 292 cs4270->slave_mode = 0; 293 break; 294 default: 295 /* all other modes are unsupported by the hardware */ 296 ret = -EINVAL; 297 } 298 299 return ret; 300 } 301 302 /** 303 * cs4270_fill_cache - pre-fill the CS4270 register cache. 304 * @codec: the codec for this CS4270 305 * 306 * This function fills in the CS4270 register cache by reading the register 307 * values from the hardware. 308 * 309 * This CS4270 registers are cached to avoid excessive I2C I/O operations. 310 * After the initial read to pre-fill the cache, the CS4270 never updates 311 * the register values, so we won't have a cache coherency problem. 312 * 313 * We use the auto-increment feature of the CS4270 to read all registers in 314 * one shot. 315 */ 316 static int cs4270_fill_cache(struct snd_soc_codec *codec) 317 { 318 u8 *cache = codec->reg_cache; 319 struct i2c_client *i2c_client = codec->control_data; 320 s32 length; 321 322 length = i2c_smbus_read_i2c_block_data(i2c_client, 323 CS4270_FIRSTREG | CS4270_I2C_INCR, CS4270_NUMREGS, cache); 324 325 if (length != CS4270_NUMREGS) { 326 dev_err(codec->dev, "i2c read failure, addr=0x%x\n", 327 i2c_client->addr); 328 return -EIO; 329 } 330 331 return 0; 332 } 333 334 /** 335 * cs4270_read_reg_cache - read from the CS4270 register cache. 336 * @codec: the codec for this CS4270 337 * @reg: the register to read 338 * 339 * This function returns the value for a given register. It reads only from 340 * the register cache, not the hardware itself. 341 * 342 * This CS4270 registers are cached to avoid excessive I2C I/O operations. 343 * After the initial read to pre-fill the cache, the CS4270 never updates 344 * the register values, so we won't have a cache coherency problem. 345 */ 346 static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec, 347 unsigned int reg) 348 { 349 u8 *cache = codec->reg_cache; 350 351 if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) 352 return -EIO; 353 354 return cache[reg - CS4270_FIRSTREG]; 355 } 356 357 /** 358 * cs4270_i2c_write - write to a CS4270 register via the I2C bus. 359 * @codec: the codec for this CS4270 360 * @reg: the register to write 361 * @value: the value to write to the register 362 * 363 * This function writes the given value to the given CS4270 register, and 364 * also updates the register cache. 365 * 366 * Note that we don't use the hw_write function pointer of snd_soc_codec. 367 * That's because it's too clunky: the hw_write_t prototype does not match 368 * i2c_smbus_write_byte_data(), and it's just another layer of overhead. 369 */ 370 static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg, 371 unsigned int value) 372 { 373 u8 *cache = codec->reg_cache; 374 375 if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) 376 return -EIO; 377 378 /* Only perform an I2C operation if the new value is different */ 379 if (cache[reg - CS4270_FIRSTREG] != value) { 380 struct i2c_client *client = codec->control_data; 381 if (i2c_smbus_write_byte_data(client, reg, value)) { 382 dev_err(codec->dev, "i2c write failed\n"); 383 return -EIO; 384 } 385 386 /* We've written to the hardware, so update the cache */ 387 cache[reg - CS4270_FIRSTREG] = value; 388 } 389 390 return 0; 391 } 392 393 /** 394 * cs4270_hw_params - program the CS4270 with the given hardware parameters. 395 * @substream: the audio stream 396 * @params: the hardware parameters to set 397 * @dai: the SOC DAI (ignored) 398 * 399 * This function programs the hardware with the values provided. 400 * Specifically, the sample rate and the data format. 401 * 402 * The .ops functions are used to provide board-specific data, like input 403 * frequencies, to this driver. This function takes that information, 404 * combines it with the hardware parameters provided, and programs the 405 * hardware accordingly. 406 */ 407 static int cs4270_hw_params(struct snd_pcm_substream *substream, 408 struct snd_pcm_hw_params *params, 409 struct snd_soc_dai *dai) 410 { 411 struct snd_soc_pcm_runtime *rtd = substream->private_data; 412 struct snd_soc_device *socdev = rtd->socdev; 413 struct snd_soc_codec *codec = socdev->card->codec; 414 struct cs4270_private *cs4270 = codec->private_data; 415 int ret; 416 unsigned int i; 417 unsigned int rate; 418 unsigned int ratio; 419 int reg; 420 421 /* Figure out which MCLK/LRCK ratio to use */ 422 423 rate = params_rate(params); /* Sampling rate, in Hz */ 424 ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */ 425 426 for (i = 0; i < NUM_MCLK_RATIOS; i++) { 427 if (cs4270_mode_ratios[i].ratio == ratio) 428 break; 429 } 430 431 if (i == NUM_MCLK_RATIOS) { 432 /* We did not find a matching ratio */ 433 dev_err(codec->dev, "could not find matching ratio\n"); 434 return -EINVAL; 435 } 436 437 /* Set the sample rate */ 438 439 reg = snd_soc_read(codec, CS4270_MODE); 440 reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK); 441 reg |= cs4270_mode_ratios[i].mclk; 442 443 if (cs4270->slave_mode) 444 reg |= CS4270_MODE_SLAVE; 445 else 446 reg |= cs4270_mode_ratios[i].speed_mode; 447 448 ret = snd_soc_write(codec, CS4270_MODE, reg); 449 if (ret < 0) { 450 dev_err(codec->dev, "i2c write failed\n"); 451 return ret; 452 } 453 454 /* Set the DAI format */ 455 456 reg = snd_soc_read(codec, CS4270_FORMAT); 457 reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK); 458 459 switch (cs4270->mode) { 460 case SND_SOC_DAIFMT_I2S: 461 reg |= CS4270_FORMAT_DAC_I2S | CS4270_FORMAT_ADC_I2S; 462 break; 463 case SND_SOC_DAIFMT_LEFT_J: 464 reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ; 465 break; 466 default: 467 dev_err(codec->dev, "unknown dai format\n"); 468 return -EINVAL; 469 } 470 471 ret = snd_soc_write(codec, CS4270_FORMAT, reg); 472 if (ret < 0) { 473 dev_err(codec->dev, "i2c write failed\n"); 474 return ret; 475 } 476 477 return ret; 478 } 479 480 /** 481 * cs4270_dai_mute - enable/disable the CS4270 external mute 482 * @dai: the SOC DAI 483 * @mute: 0 = disable mute, 1 = enable mute 484 * 485 * This function toggles the mute bits in the MUTE register. The CS4270's 486 * mute capability is intended for external muting circuitry, so if the 487 * board does not have the MUTEA or MUTEB pins connected to such circuitry, 488 * then this function will do nothing. 489 */ 490 static int cs4270_dai_mute(struct snd_soc_dai *dai, int mute) 491 { 492 struct snd_soc_codec *codec = dai->codec; 493 struct cs4270_private *cs4270 = codec->private_data; 494 int reg6; 495 496 reg6 = snd_soc_read(codec, CS4270_MUTE); 497 498 if (mute) 499 reg6 |= CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B; 500 else { 501 reg6 &= ~(CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B); 502 reg6 |= cs4270->manual_mute; 503 } 504 505 return snd_soc_write(codec, CS4270_MUTE, reg6); 506 } 507 508 /** 509 * cs4270_soc_put_mute - put callback for the 'Master Playback switch' 510 * alsa control. 511 * @kcontrol: mixer control 512 * @ucontrol: control element information 513 * 514 * This function basically passes the arguments on to the generic 515 * snd_soc_put_volsw() function and saves the mute information in 516 * our private data structure. This is because we want to prevent 517 * cs4270_dai_mute() neglecting the user's decision to manually 518 * mute the codec's output. 519 * 520 * Returns 0 for success. 521 */ 522 static int cs4270_soc_put_mute(struct snd_kcontrol *kcontrol, 523 struct snd_ctl_elem_value *ucontrol) 524 { 525 struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol); 526 struct cs4270_private *cs4270 = codec->private_data; 527 int left = !ucontrol->value.integer.value[0]; 528 int right = !ucontrol->value.integer.value[1]; 529 530 cs4270->manual_mute = (left ? CS4270_MUTE_DAC_A : 0) | 531 (right ? CS4270_MUTE_DAC_B : 0); 532 533 return snd_soc_put_volsw(kcontrol, ucontrol); 534 } 535 536 /* A list of non-DAPM controls that the CS4270 supports */ 537 static const struct snd_kcontrol_new cs4270_snd_controls[] = { 538 SOC_DOUBLE_R("Master Playback Volume", 539 CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 1), 540 SOC_SINGLE("Digital Sidetone Switch", CS4270_FORMAT, 5, 1, 0), 541 SOC_SINGLE("Soft Ramp Switch", CS4270_TRANS, 6, 1, 0), 542 SOC_SINGLE("Zero Cross Switch", CS4270_TRANS, 5, 1, 0), 543 SOC_SINGLE("De-emphasis filter", CS4270_TRANS, 0, 1, 0), 544 SOC_SINGLE("Popguard Switch", CS4270_MODE, 0, 1, 1), 545 SOC_SINGLE("Auto-Mute Switch", CS4270_MUTE, 5, 1, 0), 546 SOC_DOUBLE("Master Capture Switch", CS4270_MUTE, 3, 4, 1, 1), 547 SOC_DOUBLE_EXT("Master Playback Switch", CS4270_MUTE, 0, 1, 1, 1, 548 snd_soc_get_volsw, cs4270_soc_put_mute), 549 }; 550 551 /* 552 * cs4270_codec - global variable to store codec for the ASoC probe function 553 * 554 * If struct i2c_driver had a private_data field, we wouldn't need to use 555 * cs4270_codec. This is the only way to pass the codec structure from 556 * cs4270_i2c_probe() to cs4270_probe(). Unfortunately, there is no good 557 * way to synchronize these two functions. cs4270_i2c_probe() can be called 558 * multiple times before cs4270_probe() is called even once. So for now, we 559 * also only allow cs4270_i2c_probe() to be run once. That means that we do 560 * not support more than one cs4270 device in the system, at least for now. 561 */ 562 static struct snd_soc_codec *cs4270_codec; 563 564 static struct snd_soc_dai_ops cs4270_dai_ops = { 565 .hw_params = cs4270_hw_params, 566 .set_sysclk = cs4270_set_dai_sysclk, 567 .set_fmt = cs4270_set_dai_fmt, 568 .digital_mute = cs4270_dai_mute, 569 }; 570 571 struct snd_soc_dai cs4270_dai = { 572 .name = "cs4270", 573 .playback = { 574 .stream_name = "Playback", 575 .channels_min = 1, 576 .channels_max = 2, 577 .rates = 0, 578 .formats = CS4270_FORMATS, 579 }, 580 .capture = { 581 .stream_name = "Capture", 582 .channels_min = 1, 583 .channels_max = 2, 584 .rates = 0, 585 .formats = CS4270_FORMATS, 586 }, 587 .ops = &cs4270_dai_ops, 588 }; 589 EXPORT_SYMBOL_GPL(cs4270_dai); 590 591 /** 592 * cs4270_probe - ASoC probe function 593 * @pdev: platform device 594 * 595 * This function is called when ASoC has all the pieces it needs to 596 * instantiate a sound driver. 597 */ 598 static int cs4270_probe(struct platform_device *pdev) 599 { 600 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 601 struct snd_soc_codec *codec = cs4270_codec; 602 struct cs4270_private *cs4270 = codec->private_data; 603 int i, ret; 604 605 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */ 606 socdev->card->codec = codec; 607 608 /* Register PCMs */ 609 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 610 if (ret < 0) { 611 dev_err(codec->dev, "failed to create pcms\n"); 612 return ret; 613 } 614 615 /* Add the non-DAPM controls */ 616 ret = snd_soc_add_controls(codec, cs4270_snd_controls, 617 ARRAY_SIZE(cs4270_snd_controls)); 618 if (ret < 0) { 619 dev_err(codec->dev, "failed to add controls\n"); 620 goto error_free_pcms; 621 } 622 623 /* get the power supply regulators */ 624 for (i = 0; i < ARRAY_SIZE(supply_names); i++) 625 cs4270->supplies[i].supply = supply_names[i]; 626 627 ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(cs4270->supplies), 628 cs4270->supplies); 629 if (ret < 0) 630 goto error_free_pcms; 631 632 ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), 633 cs4270->supplies); 634 if (ret < 0) 635 goto error_free_regulators; 636 637 return 0; 638 639 error_free_regulators: 640 regulator_bulk_free(ARRAY_SIZE(cs4270->supplies), 641 cs4270->supplies); 642 643 error_free_pcms: 644 snd_soc_free_pcms(socdev); 645 646 return ret; 647 } 648 649 /** 650 * cs4270_remove - ASoC remove function 651 * @pdev: platform device 652 * 653 * This function is the counterpart to cs4270_probe(). 654 */ 655 static int cs4270_remove(struct platform_device *pdev) 656 { 657 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 658 struct snd_soc_codec *codec = cs4270_codec; 659 struct cs4270_private *cs4270 = codec->private_data; 660 661 snd_soc_free_pcms(socdev); 662 regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), cs4270->supplies); 663 regulator_bulk_free(ARRAY_SIZE(cs4270->supplies), cs4270->supplies); 664 665 return 0; 666 }; 667 668 /** 669 * cs4270_i2c_probe - initialize the I2C interface of the CS4270 670 * @i2c_client: the I2C client object 671 * @id: the I2C device ID (ignored) 672 * 673 * This function is called whenever the I2C subsystem finds a device that 674 * matches the device ID given via a prior call to i2c_add_driver(). 675 */ 676 static int cs4270_i2c_probe(struct i2c_client *i2c_client, 677 const struct i2c_device_id *id) 678 { 679 struct snd_soc_codec *codec; 680 struct cs4270_private *cs4270; 681 unsigned int reg; 682 int ret; 683 684 /* For now, we only support one cs4270 device in the system. See the 685 * comment for cs4270_codec. 686 */ 687 if (cs4270_codec) { 688 dev_err(&i2c_client->dev, "ignoring CS4270 at addr %X\n", 689 i2c_client->addr); 690 dev_err(&i2c_client->dev, "only one per board allowed\n"); 691 /* Should we return something other than ENODEV here? */ 692 return -ENODEV; 693 } 694 695 /* Verify that we have a CS4270 */ 696 697 ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID); 698 if (ret < 0) { 699 dev_err(&i2c_client->dev, "failed to read i2c at addr %X\n", 700 i2c_client->addr); 701 return ret; 702 } 703 /* The top four bits of the chip ID should be 1100. */ 704 if ((ret & 0xF0) != 0xC0) { 705 dev_err(&i2c_client->dev, "device at addr %X is not a CS4270\n", 706 i2c_client->addr); 707 return -ENODEV; 708 } 709 710 dev_info(&i2c_client->dev, "found device at i2c address %X\n", 711 i2c_client->addr); 712 dev_info(&i2c_client->dev, "hardware revision %X\n", ret & 0xF); 713 714 /* Allocate enough space for the snd_soc_codec structure 715 and our private data together. */ 716 cs4270 = kzalloc(sizeof(struct cs4270_private), GFP_KERNEL); 717 if (!cs4270) { 718 dev_err(&i2c_client->dev, "could not allocate codec\n"); 719 return -ENOMEM; 720 } 721 codec = &cs4270->codec; 722 723 mutex_init(&codec->mutex); 724 INIT_LIST_HEAD(&codec->dapm_widgets); 725 INIT_LIST_HEAD(&codec->dapm_paths); 726 727 codec->dev = &i2c_client->dev; 728 codec->name = "CS4270"; 729 codec->owner = THIS_MODULE; 730 codec->dai = &cs4270_dai; 731 codec->num_dai = 1; 732 codec->private_data = cs4270; 733 codec->control_data = i2c_client; 734 codec->read = cs4270_read_reg_cache; 735 codec->write = cs4270_i2c_write; 736 codec->reg_cache = cs4270->reg_cache; 737 codec->reg_cache_size = CS4270_NUMREGS; 738 739 /* The I2C interface is set up, so pre-fill our register cache */ 740 741 ret = cs4270_fill_cache(codec); 742 if (ret < 0) { 743 dev_err(&i2c_client->dev, "failed to fill register cache\n"); 744 goto error_free_codec; 745 } 746 747 /* Disable auto-mute. This feature appears to be buggy. In some 748 * situations, auto-mute will not deactivate when it should, so we want 749 * this feature disabled by default. An application (e.g. alsactl) can 750 * re-enabled it by using the controls. 751 */ 752 753 reg = cs4270_read_reg_cache(codec, CS4270_MUTE); 754 reg &= ~CS4270_MUTE_AUTO; 755 ret = cs4270_i2c_write(codec, CS4270_MUTE, reg); 756 if (ret < 0) { 757 dev_err(&i2c_client->dev, "i2c write failed\n"); 758 return ret; 759 } 760 761 /* Disable automatic volume control. The hardware enables, and it 762 * causes volume change commands to be delayed, sometimes until after 763 * playback has started. An application (e.g. alsactl) can 764 * re-enabled it by using the controls. 765 */ 766 767 reg = cs4270_read_reg_cache(codec, CS4270_TRANS); 768 reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO); 769 ret = cs4270_i2c_write(codec, CS4270_TRANS, reg); 770 if (ret < 0) { 771 dev_err(&i2c_client->dev, "i2c write failed\n"); 772 return ret; 773 } 774 775 /* Initialize the DAI. Normally, we'd prefer to have a kmalloc'd DAI 776 * structure for each CS4270 device, but the machine driver needs to 777 * have a pointer to the DAI structure, so for now it must be a global 778 * variable. 779 */ 780 cs4270_dai.dev = &i2c_client->dev; 781 782 /* Register the DAI. If all the other ASoC driver have already 783 * registered, then this will call our probe function, so 784 * cs4270_codec needs to be ready. 785 */ 786 cs4270_codec = codec; 787 ret = snd_soc_register_dai(&cs4270_dai); 788 if (ret < 0) { 789 dev_err(&i2c_client->dev, "failed to register DAIe\n"); 790 goto error_free_codec; 791 } 792 793 i2c_set_clientdata(i2c_client, cs4270); 794 795 return 0; 796 797 error_free_codec: 798 kfree(cs4270); 799 cs4270_codec = NULL; 800 cs4270_dai.dev = NULL; 801 802 return ret; 803 } 804 805 /** 806 * cs4270_i2c_remove - remove an I2C device 807 * @i2c_client: the I2C client object 808 * 809 * This function is the counterpart to cs4270_i2c_probe(). 810 */ 811 static int cs4270_i2c_remove(struct i2c_client *i2c_client) 812 { 813 struct cs4270_private *cs4270 = i2c_get_clientdata(i2c_client); 814 815 kfree(cs4270); 816 cs4270_codec = NULL; 817 cs4270_dai.dev = NULL; 818 819 return 0; 820 } 821 822 /* 823 * cs4270_id - I2C device IDs supported by this driver 824 */ 825 static struct i2c_device_id cs4270_id[] = { 826 {"cs4270", 0}, 827 {} 828 }; 829 MODULE_DEVICE_TABLE(i2c, cs4270_id); 830 831 #ifdef CONFIG_PM 832 833 /* This suspend/resume implementation can handle both - a simple standby 834 * where the codec remains powered, and a full suspend, where the voltage 835 * domain the codec is connected to is teared down and/or any other hardware 836 * reset condition is asserted. 837 * 838 * The codec's own power saving features are enabled in the suspend callback, 839 * and all registers are written back to the hardware when resuming. 840 */ 841 842 static int cs4270_soc_suspend(struct platform_device *pdev, pm_message_t mesg) 843 { 844 struct snd_soc_codec *codec = cs4270_codec; 845 struct cs4270_private *cs4270 = codec->private_data; 846 int reg, ret; 847 848 reg = snd_soc_read(codec, CS4270_PWRCTL) | CS4270_PWRCTL_PDN_ALL; 849 if (reg < 0) 850 return reg; 851 852 ret = snd_soc_write(codec, CS4270_PWRCTL, reg); 853 if (ret < 0) 854 return ret; 855 856 regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), 857 cs4270->supplies); 858 859 return 0; 860 } 861 862 static int cs4270_soc_resume(struct platform_device *pdev) 863 { 864 struct snd_soc_codec *codec = cs4270_codec; 865 struct cs4270_private *cs4270 = codec->private_data; 866 struct i2c_client *i2c_client = codec->control_data; 867 int reg; 868 869 regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), 870 cs4270->supplies); 871 872 /* In case the device was put to hard reset during sleep, we need to 873 * wait 500ns here before any I2C communication. */ 874 ndelay(500); 875 876 /* first restore the entire register cache ... */ 877 for (reg = CS4270_FIRSTREG; reg <= CS4270_LASTREG; reg++) { 878 u8 val = snd_soc_read(codec, reg); 879 880 if (i2c_smbus_write_byte_data(i2c_client, reg, val)) { 881 dev_err(codec->dev, "i2c write failed\n"); 882 return -EIO; 883 } 884 } 885 886 /* ... then disable the power-down bits */ 887 reg = snd_soc_read(codec, CS4270_PWRCTL); 888 reg &= ~CS4270_PWRCTL_PDN_ALL; 889 890 return snd_soc_write(codec, CS4270_PWRCTL, reg); 891 } 892 #else 893 #define cs4270_soc_suspend NULL 894 #define cs4270_soc_resume NULL 895 #endif /* CONFIG_PM */ 896 897 /* 898 * cs4270_i2c_driver - I2C device identification 899 * 900 * This structure tells the I2C subsystem how to identify and support a 901 * given I2C device type. 902 */ 903 static struct i2c_driver cs4270_i2c_driver = { 904 .driver = { 905 .name = "cs4270", 906 .owner = THIS_MODULE, 907 }, 908 .id_table = cs4270_id, 909 .probe = cs4270_i2c_probe, 910 .remove = cs4270_i2c_remove, 911 }; 912 913 /* 914 * ASoC codec device structure 915 * 916 * Assign this variable to the codec_dev field of the machine driver's 917 * snd_soc_device structure. 918 */ 919 struct snd_soc_codec_device soc_codec_device_cs4270 = { 920 .probe = cs4270_probe, 921 .remove = cs4270_remove, 922 .suspend = cs4270_soc_suspend, 923 .resume = cs4270_soc_resume, 924 }; 925 EXPORT_SYMBOL_GPL(soc_codec_device_cs4270); 926 927 static int __init cs4270_init(void) 928 { 929 pr_info("Cirrus Logic CS4270 ALSA SoC Codec Driver\n"); 930 931 return i2c_add_driver(&cs4270_i2c_driver); 932 } 933 module_init(cs4270_init); 934 935 static void __exit cs4270_exit(void) 936 { 937 i2c_del_driver(&cs4270_i2c_driver); 938 } 939 module_exit(cs4270_exit); 940 941 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); 942 MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver"); 943 MODULE_LICENSE("GPL"); 944