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/slab.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 #include <linux/gpio/consumer.h> 33 #include <linux/of_device.h> 34 35 #define CS4270_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \ 36 SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S20_3LE | \ 37 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE) 38 39 /* CS4270 registers addresses */ 40 #define CS4270_CHIPID 0x01 /* Chip ID */ 41 #define CS4270_PWRCTL 0x02 /* Power Control */ 42 #define CS4270_MODE 0x03 /* Mode Control */ 43 #define CS4270_FORMAT 0x04 /* Serial Format, ADC/DAC Control */ 44 #define CS4270_TRANS 0x05 /* Transition Control */ 45 #define CS4270_MUTE 0x06 /* Mute Control */ 46 #define CS4270_VOLA 0x07 /* DAC Channel A Volume Control */ 47 #define CS4270_VOLB 0x08 /* DAC Channel B Volume Control */ 48 49 #define CS4270_FIRSTREG 0x01 50 #define CS4270_LASTREG 0x08 51 #define CS4270_NUMREGS (CS4270_LASTREG - CS4270_FIRSTREG + 1) 52 #define CS4270_I2C_INCR 0x80 53 54 /* Bit masks for the CS4270 registers */ 55 #define CS4270_CHIPID_ID 0xF0 56 #define CS4270_CHIPID_REV 0x0F 57 #define CS4270_PWRCTL_FREEZE 0x80 58 #define CS4270_PWRCTL_PDN_ADC 0x20 59 #define CS4270_PWRCTL_PDN_DAC 0x02 60 #define CS4270_PWRCTL_PDN 0x01 61 #define CS4270_PWRCTL_PDN_ALL \ 62 (CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC | CS4270_PWRCTL_PDN) 63 #define CS4270_MODE_SPEED_MASK 0x30 64 #define CS4270_MODE_1X 0x00 65 #define CS4270_MODE_2X 0x10 66 #define CS4270_MODE_4X 0x20 67 #define CS4270_MODE_SLAVE 0x30 68 #define CS4270_MODE_DIV_MASK 0x0E 69 #define CS4270_MODE_DIV1 0x00 70 #define CS4270_MODE_DIV15 0x02 71 #define CS4270_MODE_DIV2 0x04 72 #define CS4270_MODE_DIV3 0x06 73 #define CS4270_MODE_DIV4 0x08 74 #define CS4270_MODE_POPGUARD 0x01 75 #define CS4270_FORMAT_FREEZE_A 0x80 76 #define CS4270_FORMAT_FREEZE_B 0x40 77 #define CS4270_FORMAT_LOOPBACK 0x20 78 #define CS4270_FORMAT_DAC_MASK 0x18 79 #define CS4270_FORMAT_DAC_LJ 0x00 80 #define CS4270_FORMAT_DAC_I2S 0x08 81 #define CS4270_FORMAT_DAC_RJ16 0x18 82 #define CS4270_FORMAT_DAC_RJ24 0x10 83 #define CS4270_FORMAT_ADC_MASK 0x01 84 #define CS4270_FORMAT_ADC_LJ 0x00 85 #define CS4270_FORMAT_ADC_I2S 0x01 86 #define CS4270_TRANS_ONE_VOL 0x80 87 #define CS4270_TRANS_SOFT 0x40 88 #define CS4270_TRANS_ZERO 0x20 89 #define CS4270_TRANS_INV_ADC_A 0x08 90 #define CS4270_TRANS_INV_ADC_B 0x10 91 #define CS4270_TRANS_INV_DAC_A 0x02 92 #define CS4270_TRANS_INV_DAC_B 0x04 93 #define CS4270_TRANS_DEEMPH 0x01 94 #define CS4270_MUTE_AUTO 0x20 95 #define CS4270_MUTE_ADC_A 0x08 96 #define CS4270_MUTE_ADC_B 0x10 97 #define CS4270_MUTE_POLARITY 0x04 98 #define CS4270_MUTE_DAC_A 0x01 99 #define CS4270_MUTE_DAC_B 0x02 100 101 /* Power-on default values for the registers 102 * 103 * This array contains the power-on default values of the registers, with the 104 * exception of the "CHIPID" register (01h). The lower four bits of that 105 * register contain the hardware revision, so it is treated as volatile. 106 */ 107 static const struct reg_default cs4270_reg_defaults[] = { 108 { 2, 0x00 }, 109 { 3, 0x30 }, 110 { 4, 0x00 }, 111 { 5, 0x60 }, 112 { 6, 0x20 }, 113 { 7, 0x00 }, 114 { 8, 0x00 }, 115 }; 116 117 static const char *supply_names[] = { 118 "va", "vd", "vlc" 119 }; 120 121 /* Private data for the CS4270 */ 122 struct cs4270_private { 123 struct regmap *regmap; 124 unsigned int mclk; /* Input frequency of the MCLK pin */ 125 unsigned int mode; /* The mode (I2S or left-justified) */ 126 unsigned int slave_mode; 127 unsigned int manual_mute; 128 129 /* power domain regulators */ 130 struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; 131 132 /* reset gpio */ 133 struct gpio_desc *reset_gpio; 134 }; 135 136 static const struct snd_soc_dapm_widget cs4270_dapm_widgets[] = { 137 SND_SOC_DAPM_INPUT("AINL"), 138 SND_SOC_DAPM_INPUT("AINR"), 139 140 SND_SOC_DAPM_OUTPUT("AOUTL"), 141 SND_SOC_DAPM_OUTPUT("AOUTR"), 142 }; 143 144 static const struct snd_soc_dapm_route cs4270_dapm_routes[] = { 145 { "Capture", NULL, "AINL" }, 146 { "Capture", NULL, "AINR" }, 147 148 { "AOUTL", NULL, "Playback" }, 149 { "AOUTR", NULL, "Playback" }, 150 }; 151 152 /** 153 * struct cs4270_mode_ratios - clock ratio tables 154 * @ratio: the ratio of MCLK to the sample rate 155 * @speed_mode: the Speed Mode bits to set in the Mode Control register for 156 * this ratio 157 * @mclk: the Ratio Select bits to set in the Mode Control register for this 158 * ratio 159 * 160 * The data for this chart is taken from Table 5 of the CS4270 reference 161 * manual. 162 * 163 * This table is used to determine how to program the Mode Control register. 164 * It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling 165 * rates the CS4270 currently supports. 166 * 167 * @speed_mode is the corresponding bit pattern to be written to the 168 * MODE bits of the Mode Control Register 169 * 170 * @mclk is the corresponding bit pattern to be wirten to the MCLK bits of 171 * the Mode Control Register. 172 * 173 * In situations where a single ratio is represented by multiple speed 174 * modes, we favor the slowest speed. E.g, for a ratio of 128, we pick 175 * double-speed instead of quad-speed. However, the CS4270 errata states 176 * that divide-By-1.5 can cause failures, so we avoid that mode where 177 * possible. 178 * 179 * Errata: There is an errata for the CS4270 where divide-by-1.5 does not 180 * work if Vd is 3.3V. If this effects you, select the 181 * CONFIG_SND_SOC_CS4270_VD33_ERRATA Kconfig option, and the driver will 182 * never select any sample rates that require divide-by-1.5. 183 */ 184 struct cs4270_mode_ratios { 185 unsigned int ratio; 186 u8 speed_mode; 187 u8 mclk; 188 }; 189 190 static struct cs4270_mode_ratios cs4270_mode_ratios[] = { 191 {64, CS4270_MODE_4X, CS4270_MODE_DIV1}, 192 #ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA 193 {96, CS4270_MODE_4X, CS4270_MODE_DIV15}, 194 #endif 195 {128, CS4270_MODE_2X, CS4270_MODE_DIV1}, 196 {192, CS4270_MODE_4X, CS4270_MODE_DIV3}, 197 {256, CS4270_MODE_1X, CS4270_MODE_DIV1}, 198 {384, CS4270_MODE_2X, CS4270_MODE_DIV3}, 199 {512, CS4270_MODE_1X, CS4270_MODE_DIV2}, 200 {768, CS4270_MODE_1X, CS4270_MODE_DIV3}, 201 {1024, CS4270_MODE_1X, CS4270_MODE_DIV4} 202 }; 203 204 /* The number of MCLK/LRCK ratios supported by the CS4270 */ 205 #define NUM_MCLK_RATIOS ARRAY_SIZE(cs4270_mode_ratios) 206 207 static bool cs4270_reg_is_readable(struct device *dev, unsigned int reg) 208 { 209 return (reg >= CS4270_FIRSTREG) && (reg <= CS4270_LASTREG); 210 } 211 212 static bool cs4270_reg_is_volatile(struct device *dev, unsigned int reg) 213 { 214 /* Unreadable registers are considered volatile */ 215 if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) 216 return true; 217 218 return reg == CS4270_CHIPID; 219 } 220 221 /** 222 * cs4270_set_dai_sysclk - determine the CS4270 samples rates. 223 * @codec_dai: the codec DAI 224 * @clk_id: the clock ID (ignored) 225 * @freq: the MCLK input frequency 226 * @dir: the clock direction (ignored) 227 * 228 * This function is used to tell the codec driver what the input MCLK 229 * frequency is. 230 * 231 * The value of MCLK is used to determine which sample rates are supported 232 * by the CS4270. The ratio of MCLK / Fs must be equal to one of nine 233 * supported values - 64, 96, 128, 192, 256, 384, 512, 768, and 1024. 234 * 235 * This function calculates the nine ratios and determines which ones match 236 * a standard sample rate. If there's a match, then it is added to the list 237 * of supported sample rates. 238 * 239 * This function must be called by the machine driver's 'startup' function, 240 * otherwise the list of supported sample rates will not be available in 241 * time for ALSA. 242 * 243 * For setups with variable MCLKs, pass 0 as 'freq' argument. This will cause 244 * theoretically possible sample rates to be enabled. Call it again with a 245 * proper value set one the external clock is set (most probably you would do 246 * that from a machine's driver 'hw_param' hook. 247 */ 248 static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai, 249 int clk_id, unsigned int freq, int dir) 250 { 251 struct snd_soc_component *component = codec_dai->component; 252 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 253 254 cs4270->mclk = freq; 255 return 0; 256 } 257 258 /** 259 * cs4270_set_dai_fmt - configure the codec for the selected audio format 260 * @codec_dai: the codec DAI 261 * @format: a SND_SOC_DAIFMT_x value indicating the data format 262 * 263 * This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the 264 * codec accordingly. 265 * 266 * Currently, this function only supports SND_SOC_DAIFMT_I2S and 267 * SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified 268 * data for playback only, but ASoC currently does not support different 269 * formats for playback vs. record. 270 */ 271 static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai, 272 unsigned int format) 273 { 274 struct snd_soc_component *component = codec_dai->component; 275 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 276 277 /* set DAI format */ 278 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 279 case SND_SOC_DAIFMT_I2S: 280 case SND_SOC_DAIFMT_LEFT_J: 281 cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK; 282 break; 283 default: 284 dev_err(component->dev, "invalid dai format\n"); 285 return -EINVAL; 286 } 287 288 /* set master/slave audio interface */ 289 switch (format & SND_SOC_DAIFMT_MASTER_MASK) { 290 case SND_SOC_DAIFMT_CBS_CFS: 291 cs4270->slave_mode = 1; 292 break; 293 case SND_SOC_DAIFMT_CBM_CFM: 294 cs4270->slave_mode = 0; 295 break; 296 default: 297 /* all other modes are unsupported by the hardware */ 298 dev_err(component->dev, "Unknown master/slave configuration\n"); 299 return -EINVAL; 300 } 301 302 return 0; 303 } 304 305 /** 306 * cs4270_hw_params - program the CS4270 with the given hardware parameters. 307 * @substream: the audio stream 308 * @params: the hardware parameters to set 309 * @dai: the SOC DAI (ignored) 310 * 311 * This function programs the hardware with the values provided. 312 * Specifically, the sample rate and the data format. 313 * 314 * The .ops functions are used to provide board-specific data, like input 315 * frequencies, to this driver. This function takes that information, 316 * combines it with the hardware parameters provided, and programs the 317 * hardware accordingly. 318 */ 319 static int cs4270_hw_params(struct snd_pcm_substream *substream, 320 struct snd_pcm_hw_params *params, 321 struct snd_soc_dai *dai) 322 { 323 struct snd_soc_component *component = dai->component; 324 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 325 int ret; 326 unsigned int i; 327 unsigned int rate; 328 unsigned int ratio; 329 int reg; 330 331 /* Figure out which MCLK/LRCK ratio to use */ 332 333 rate = params_rate(params); /* Sampling rate, in Hz */ 334 ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */ 335 336 for (i = 0; i < NUM_MCLK_RATIOS; i++) { 337 if (cs4270_mode_ratios[i].ratio == ratio) 338 break; 339 } 340 341 if (i == NUM_MCLK_RATIOS) { 342 /* We did not find a matching ratio */ 343 dev_err(component->dev, "could not find matching ratio\n"); 344 return -EINVAL; 345 } 346 347 /* Set the sample rate */ 348 349 reg = snd_soc_component_read(component, CS4270_MODE); 350 reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK); 351 reg |= cs4270_mode_ratios[i].mclk; 352 353 if (cs4270->slave_mode) 354 reg |= CS4270_MODE_SLAVE; 355 else 356 reg |= cs4270_mode_ratios[i].speed_mode; 357 358 ret = snd_soc_component_write(component, CS4270_MODE, reg); 359 if (ret < 0) { 360 dev_err(component->dev, "i2c write failed\n"); 361 return ret; 362 } 363 364 /* Set the DAI format */ 365 366 reg = snd_soc_component_read(component, CS4270_FORMAT); 367 reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK); 368 369 switch (cs4270->mode) { 370 case SND_SOC_DAIFMT_I2S: 371 reg |= CS4270_FORMAT_DAC_I2S | CS4270_FORMAT_ADC_I2S; 372 break; 373 case SND_SOC_DAIFMT_LEFT_J: 374 reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ; 375 break; 376 default: 377 dev_err(component->dev, "unknown dai format\n"); 378 return -EINVAL; 379 } 380 381 ret = snd_soc_component_write(component, CS4270_FORMAT, reg); 382 if (ret < 0) { 383 dev_err(component->dev, "i2c write failed\n"); 384 return ret; 385 } 386 387 return ret; 388 } 389 390 /** 391 * cs4270_dai_mute - enable/disable the CS4270 external mute 392 * @dai: the SOC DAI 393 * @mute: 0 = disable mute, 1 = enable mute 394 * @direction: (ignored) 395 * 396 * This function toggles the mute bits in the MUTE register. The CS4270's 397 * mute capability is intended for external muting circuitry, so if the 398 * board does not have the MUTEA or MUTEB pins connected to such circuitry, 399 * then this function will do nothing. 400 */ 401 static int cs4270_dai_mute(struct snd_soc_dai *dai, int mute, int direction) 402 { 403 struct snd_soc_component *component = dai->component; 404 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 405 int reg6; 406 407 reg6 = snd_soc_component_read(component, CS4270_MUTE); 408 409 if (mute) 410 reg6 |= CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B; 411 else { 412 reg6 &= ~(CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B); 413 reg6 |= cs4270->manual_mute; 414 } 415 416 return snd_soc_component_write(component, CS4270_MUTE, reg6); 417 } 418 419 /** 420 * cs4270_soc_put_mute - put callback for the 'Master Playback switch' 421 * alsa control. 422 * @kcontrol: mixer control 423 * @ucontrol: control element information 424 * 425 * This function basically passes the arguments on to the generic 426 * snd_soc_put_volsw() function and saves the mute information in 427 * our private data structure. This is because we want to prevent 428 * cs4270_dai_mute() neglecting the user's decision to manually 429 * mute the codec's output. 430 * 431 * Returns 0 for success. 432 */ 433 static int cs4270_soc_put_mute(struct snd_kcontrol *kcontrol, 434 struct snd_ctl_elem_value *ucontrol) 435 { 436 struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); 437 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 438 int left = !ucontrol->value.integer.value[0]; 439 int right = !ucontrol->value.integer.value[1]; 440 441 cs4270->manual_mute = (left ? CS4270_MUTE_DAC_A : 0) | 442 (right ? CS4270_MUTE_DAC_B : 0); 443 444 return snd_soc_put_volsw(kcontrol, ucontrol); 445 } 446 447 /* A list of non-DAPM controls that the CS4270 supports */ 448 static const struct snd_kcontrol_new cs4270_snd_controls[] = { 449 SOC_DOUBLE_R("Master Playback Volume", 450 CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 1), 451 SOC_SINGLE("Digital Sidetone Switch", CS4270_FORMAT, 5, 1, 0), 452 SOC_SINGLE("Soft Ramp Switch", CS4270_TRANS, 6, 1, 0), 453 SOC_SINGLE("Zero Cross Switch", CS4270_TRANS, 5, 1, 0), 454 SOC_SINGLE("De-emphasis filter", CS4270_TRANS, 0, 1, 0), 455 SOC_SINGLE("Popguard Switch", CS4270_MODE, 0, 1, 1), 456 SOC_SINGLE("Auto-Mute Switch", CS4270_MUTE, 5, 1, 0), 457 SOC_DOUBLE("Master Capture Switch", CS4270_MUTE, 3, 4, 1, 1), 458 SOC_DOUBLE_EXT("Master Playback Switch", CS4270_MUTE, 0, 1, 1, 1, 459 snd_soc_get_volsw, cs4270_soc_put_mute), 460 }; 461 462 static const struct snd_soc_dai_ops cs4270_dai_ops = { 463 .hw_params = cs4270_hw_params, 464 .set_sysclk = cs4270_set_dai_sysclk, 465 .set_fmt = cs4270_set_dai_fmt, 466 .mute_stream = cs4270_dai_mute, 467 .no_capture_mute = 1, 468 }; 469 470 static struct snd_soc_dai_driver cs4270_dai = { 471 .name = "cs4270-hifi", 472 .playback = { 473 .stream_name = "Playback", 474 .channels_min = 2, 475 .channels_max = 2, 476 .rates = SNDRV_PCM_RATE_CONTINUOUS, 477 .rate_min = 4000, 478 .rate_max = 216000, 479 .formats = CS4270_FORMATS, 480 }, 481 .capture = { 482 .stream_name = "Capture", 483 .channels_min = 2, 484 .channels_max = 2, 485 .rates = SNDRV_PCM_RATE_CONTINUOUS, 486 .rate_min = 4000, 487 .rate_max = 216000, 488 .formats = CS4270_FORMATS, 489 }, 490 .ops = &cs4270_dai_ops, 491 }; 492 493 /** 494 * cs4270_probe - ASoC probe function 495 * @component: ASoC component 496 * 497 * This function is called when ASoC has all the pieces it needs to 498 * instantiate a sound driver. 499 */ 500 static int cs4270_probe(struct snd_soc_component *component) 501 { 502 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 503 int ret; 504 505 /* Disable auto-mute. This feature appears to be buggy. In some 506 * situations, auto-mute will not deactivate when it should, so we want 507 * this feature disabled by default. An application (e.g. alsactl) can 508 * re-enabled it by using the controls. 509 */ 510 ret = snd_soc_component_update_bits(component, CS4270_MUTE, CS4270_MUTE_AUTO, 0); 511 if (ret < 0) { 512 dev_err(component->dev, "i2c write failed\n"); 513 return ret; 514 } 515 516 /* Disable automatic volume control. The hardware enables, and it 517 * causes volume change commands to be delayed, sometimes until after 518 * playback has started. An application (e.g. alsactl) can 519 * re-enabled it by using the controls. 520 */ 521 ret = snd_soc_component_update_bits(component, CS4270_TRANS, 522 CS4270_TRANS_SOFT | CS4270_TRANS_ZERO, 0); 523 if (ret < 0) { 524 dev_err(component->dev, "i2c write failed\n"); 525 return ret; 526 } 527 528 ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), 529 cs4270->supplies); 530 531 return ret; 532 } 533 534 /** 535 * cs4270_remove - ASoC remove function 536 * @component: ASoC component 537 * 538 * This function is the counterpart to cs4270_probe(). 539 */ 540 static void cs4270_remove(struct snd_soc_component *component) 541 { 542 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 543 544 regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), cs4270->supplies); 545 }; 546 547 #ifdef CONFIG_PM 548 549 /* This suspend/resume implementation can handle both - a simple standby 550 * where the codec remains powered, and a full suspend, where the voltage 551 * domain the codec is connected to is teared down and/or any other hardware 552 * reset condition is asserted. 553 * 554 * The codec's own power saving features are enabled in the suspend callback, 555 * and all registers are written back to the hardware when resuming. 556 */ 557 558 static int cs4270_soc_suspend(struct snd_soc_component *component) 559 { 560 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 561 int reg, ret; 562 563 reg = snd_soc_component_read(component, CS4270_PWRCTL) | CS4270_PWRCTL_PDN_ALL; 564 if (reg < 0) 565 return reg; 566 567 ret = snd_soc_component_write(component, CS4270_PWRCTL, reg); 568 if (ret < 0) 569 return ret; 570 571 regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), 572 cs4270->supplies); 573 574 return 0; 575 } 576 577 static int cs4270_soc_resume(struct snd_soc_component *component) 578 { 579 struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); 580 int reg, ret; 581 582 ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), 583 cs4270->supplies); 584 if (ret != 0) 585 return ret; 586 587 /* In case the device was put to hard reset during sleep, we need to 588 * wait 500ns here before any I2C communication. */ 589 ndelay(500); 590 591 /* first restore the entire register cache ... */ 592 regcache_sync(cs4270->regmap); 593 594 /* ... then disable the power-down bits */ 595 reg = snd_soc_component_read(component, CS4270_PWRCTL); 596 reg &= ~CS4270_PWRCTL_PDN_ALL; 597 598 return snd_soc_component_write(component, CS4270_PWRCTL, reg); 599 } 600 #else 601 #define cs4270_soc_suspend NULL 602 #define cs4270_soc_resume NULL 603 #endif /* CONFIG_PM */ 604 605 /* 606 * ASoC codec driver structure 607 */ 608 static const struct snd_soc_component_driver soc_component_device_cs4270 = { 609 .probe = cs4270_probe, 610 .remove = cs4270_remove, 611 .suspend = cs4270_soc_suspend, 612 .resume = cs4270_soc_resume, 613 .controls = cs4270_snd_controls, 614 .num_controls = ARRAY_SIZE(cs4270_snd_controls), 615 .dapm_widgets = cs4270_dapm_widgets, 616 .num_dapm_widgets = ARRAY_SIZE(cs4270_dapm_widgets), 617 .dapm_routes = cs4270_dapm_routes, 618 .num_dapm_routes = ARRAY_SIZE(cs4270_dapm_routes), 619 .idle_bias_on = 1, 620 .use_pmdown_time = 1, 621 .endianness = 1, 622 }; 623 624 /* 625 * cs4270_of_match - the device tree bindings 626 */ 627 static const struct of_device_id cs4270_of_match[] = { 628 { .compatible = "cirrus,cs4270", }, 629 { } 630 }; 631 MODULE_DEVICE_TABLE(of, cs4270_of_match); 632 633 static const struct regmap_config cs4270_regmap = { 634 .reg_bits = 8, 635 .val_bits = 8, 636 .max_register = CS4270_LASTREG, 637 .reg_defaults = cs4270_reg_defaults, 638 .num_reg_defaults = ARRAY_SIZE(cs4270_reg_defaults), 639 .cache_type = REGCACHE_MAPLE, 640 .write_flag_mask = CS4270_I2C_INCR, 641 642 .readable_reg = cs4270_reg_is_readable, 643 .volatile_reg = cs4270_reg_is_volatile, 644 }; 645 646 /** 647 * cs4270_i2c_remove - deinitialize the I2C interface of the CS4270 648 * @i2c_client: the I2C client object 649 * 650 * This function puts the chip into low power mode when the i2c device 651 * is removed. 652 */ 653 static void cs4270_i2c_remove(struct i2c_client *i2c_client) 654 { 655 struct cs4270_private *cs4270 = i2c_get_clientdata(i2c_client); 656 657 gpiod_set_value_cansleep(cs4270->reset_gpio, 0); 658 } 659 660 /** 661 * cs4270_i2c_probe - initialize the I2C interface of the CS4270 662 * @i2c_client: the I2C client object 663 * 664 * This function is called whenever the I2C subsystem finds a device that 665 * matches the device ID given via a prior call to i2c_add_driver(). 666 */ 667 static int cs4270_i2c_probe(struct i2c_client *i2c_client) 668 { 669 struct cs4270_private *cs4270; 670 unsigned int val; 671 int ret, i; 672 673 cs4270 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs4270_private), 674 GFP_KERNEL); 675 if (!cs4270) 676 return -ENOMEM; 677 678 /* get the power supply regulators */ 679 for (i = 0; i < ARRAY_SIZE(supply_names); i++) 680 cs4270->supplies[i].supply = supply_names[i]; 681 682 ret = devm_regulator_bulk_get(&i2c_client->dev, 683 ARRAY_SIZE(cs4270->supplies), 684 cs4270->supplies); 685 if (ret < 0) 686 return ret; 687 688 /* reset the device */ 689 cs4270->reset_gpio = devm_gpiod_get_optional(&i2c_client->dev, "reset", 690 GPIOD_OUT_LOW); 691 if (IS_ERR(cs4270->reset_gpio)) { 692 dev_dbg(&i2c_client->dev, "Error getting CS4270 reset GPIO\n"); 693 return PTR_ERR(cs4270->reset_gpio); 694 } 695 696 if (cs4270->reset_gpio) { 697 dev_dbg(&i2c_client->dev, "Found reset GPIO\n"); 698 gpiod_set_value_cansleep(cs4270->reset_gpio, 1); 699 } 700 701 /* Sleep 500ns before i2c communications */ 702 ndelay(500); 703 704 cs4270->regmap = devm_regmap_init_i2c(i2c_client, &cs4270_regmap); 705 if (IS_ERR(cs4270->regmap)) 706 return PTR_ERR(cs4270->regmap); 707 708 /* Verify that we have a CS4270 */ 709 ret = regmap_read(cs4270->regmap, CS4270_CHIPID, &val); 710 if (ret < 0) { 711 dev_err(&i2c_client->dev, "failed to read i2c at addr %X\n", 712 i2c_client->addr); 713 return ret; 714 } 715 /* The top four bits of the chip ID should be 1100. */ 716 if ((val & 0xF0) != 0xC0) { 717 dev_err(&i2c_client->dev, "device at addr %X is not a CS4270\n", 718 i2c_client->addr); 719 return -ENODEV; 720 } 721 722 dev_info(&i2c_client->dev, "found device at i2c address %X\n", 723 i2c_client->addr); 724 dev_info(&i2c_client->dev, "hardware revision %X\n", val & 0xF); 725 726 i2c_set_clientdata(i2c_client, cs4270); 727 728 ret = devm_snd_soc_register_component(&i2c_client->dev, 729 &soc_component_device_cs4270, &cs4270_dai, 1); 730 return ret; 731 } 732 733 /* 734 * cs4270_id - I2C device IDs supported by this driver 735 */ 736 static const struct i2c_device_id cs4270_id[] = { 737 {"cs4270", 0}, 738 {} 739 }; 740 MODULE_DEVICE_TABLE(i2c, cs4270_id); 741 742 /* 743 * cs4270_i2c_driver - I2C device identification 744 * 745 * This structure tells the I2C subsystem how to identify and support a 746 * given I2C device type. 747 */ 748 static struct i2c_driver cs4270_i2c_driver = { 749 .driver = { 750 .name = "cs4270", 751 .of_match_table = cs4270_of_match, 752 }, 753 .id_table = cs4270_id, 754 .probe = cs4270_i2c_probe, 755 .remove = cs4270_i2c_remove, 756 }; 757 758 module_i2c_driver(cs4270_i2c_driver); 759 760 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); 761 MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver"); 762 MODULE_LICENSE("GPL"); 763