1 /* 2 * File: sound/soc/codecs/ad1836.c 3 * Author: Barry Song <Barry.Song@analog.com> 4 * 5 * Created: Aug 04 2009 6 * Description: Driver for AD1836 sound chip 7 * 8 * Modified: 9 * Copyright 2009 Analog Devices Inc. 10 * 11 * Bugs: Enter bugs at http://blackfin.uclinux.org/ 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 */ 18 19 #include <linux/init.h> 20 #include <linux/module.h> 21 #include <linux/kernel.h> 22 #include <linux/device.h> 23 #include <sound/core.h> 24 #include <sound/pcm.h> 25 #include <sound/pcm_params.h> 26 #include <sound/initval.h> 27 #include <sound/soc.h> 28 #include <sound/tlv.h> 29 #include <sound/soc-dapm.h> 30 #include <linux/spi/spi.h> 31 #include "ad1836.h" 32 33 /* codec private data */ 34 struct ad1836_priv { 35 struct snd_soc_codec codec; 36 u16 reg_cache[AD1836_NUM_REGS]; 37 }; 38 39 static struct snd_soc_codec *ad1836_codec; 40 struct snd_soc_codec_device soc_codec_dev_ad1836; 41 static int ad1836_register(struct ad1836_priv *ad1836); 42 static void ad1836_unregister(struct ad1836_priv *ad1836); 43 44 /* 45 * AD1836 volume/mute/de-emphasis etc. controls 46 */ 47 static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"}; 48 49 static const struct soc_enum ad1836_deemp_enum = 50 SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp); 51 52 static const struct snd_kcontrol_new ad1836_snd_controls[] = { 53 /* DAC volume control */ 54 SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL, 55 AD1836_DAC_R1_VOL, 0, 0x3FF, 0), 56 SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL, 57 AD1836_DAC_R2_VOL, 0, 0x3FF, 0), 58 SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL, 59 AD1836_DAC_R3_VOL, 0, 0x3FF, 0), 60 61 /* ADC switch control */ 62 SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE, 63 AD1836_ADCR1_MUTE, 1, 1), 64 SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE, 65 AD1836_ADCR2_MUTE, 1, 1), 66 67 /* DAC switch control */ 68 SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE, 69 AD1836_DACR1_MUTE, 1, 1), 70 SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE, 71 AD1836_DACR2_MUTE, 1, 1), 72 SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE, 73 AD1836_DACR3_MUTE, 1, 1), 74 75 /* ADC high-pass filter */ 76 SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1, 77 AD1836_ADC_HIGHPASS_FILTER, 1, 0), 78 79 /* DAC de-emphasis */ 80 SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum), 81 }; 82 83 static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = { 84 SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1, 85 AD1836_DAC_POWERDOWN, 1), 86 SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0), 87 SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1, 88 AD1836_ADC_POWERDOWN, 1, NULL, 0), 89 SND_SOC_DAPM_OUTPUT("DAC1OUT"), 90 SND_SOC_DAPM_OUTPUT("DAC2OUT"), 91 SND_SOC_DAPM_OUTPUT("DAC3OUT"), 92 SND_SOC_DAPM_INPUT("ADC1IN"), 93 SND_SOC_DAPM_INPUT("ADC2IN"), 94 }; 95 96 static const struct snd_soc_dapm_route audio_paths[] = { 97 { "DAC", NULL, "ADC_PWR" }, 98 { "ADC", NULL, "ADC_PWR" }, 99 { "DAC1OUT", "DAC1 Switch", "DAC" }, 100 { "DAC2OUT", "DAC2 Switch", "DAC" }, 101 { "DAC3OUT", "DAC3 Switch", "DAC" }, 102 { "ADC", "ADC1 Switch", "ADC1IN" }, 103 { "ADC", "ADC2 Switch", "ADC2IN" }, 104 }; 105 106 /* 107 * DAI ops entries 108 */ 109 110 static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai, 111 unsigned int fmt) 112 { 113 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 114 /* at present, we support adc aux mode to interface with 115 * blackfin sport tdm mode 116 */ 117 case SND_SOC_DAIFMT_DSP_A: 118 break; 119 default: 120 return -EINVAL; 121 } 122 123 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 124 case SND_SOC_DAIFMT_IB_IF: 125 break; 126 default: 127 return -EINVAL; 128 } 129 130 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 131 /* ALCLK,ABCLK are both output, AD1836 can only be master */ 132 case SND_SOC_DAIFMT_CBM_CFM: 133 break; 134 default: 135 return -EINVAL; 136 } 137 138 return 0; 139 } 140 141 static int ad1836_hw_params(struct snd_pcm_substream *substream, 142 struct snd_pcm_hw_params *params, 143 struct snd_soc_dai *dai) 144 { 145 int word_len = 0; 146 147 struct snd_soc_pcm_runtime *rtd = substream->private_data; 148 struct snd_soc_device *socdev = rtd->socdev; 149 struct snd_soc_codec *codec = socdev->card->codec; 150 151 /* bit size */ 152 switch (params_format(params)) { 153 case SNDRV_PCM_FORMAT_S16_LE: 154 word_len = 3; 155 break; 156 case SNDRV_PCM_FORMAT_S20_3LE: 157 word_len = 1; 158 break; 159 case SNDRV_PCM_FORMAT_S24_LE: 160 case SNDRV_PCM_FORMAT_S32_LE: 161 word_len = 0; 162 break; 163 } 164 165 snd_soc_update_bits(codec, AD1836_DAC_CTRL1, 166 AD1836_DAC_WORD_LEN_MASK, word_len); 167 168 snd_soc_update_bits(codec, AD1836_ADC_CTRL2, 169 AD1836_ADC_WORD_LEN_MASK, word_len); 170 171 return 0; 172 } 173 174 175 /* 176 * interface to read/write ad1836 register 177 */ 178 #define AD1836_SPI_REG_SHFT 12 179 #define AD1836_SPI_READ (1 << 11) 180 #define AD1836_SPI_VAL_MSK 0x3FF 181 182 /* 183 * write to the ad1836 register space 184 */ 185 186 static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg, 187 unsigned int value) 188 { 189 u16 *reg_cache = codec->reg_cache; 190 int ret = 0; 191 192 if (value != reg_cache[reg]) { 193 unsigned short buf; 194 struct spi_transfer t = { 195 .tx_buf = &buf, 196 .len = 2, 197 }; 198 struct spi_message m; 199 200 buf = (reg << AD1836_SPI_REG_SHFT) | 201 (value & AD1836_SPI_VAL_MSK); 202 spi_message_init(&m); 203 spi_message_add_tail(&t, &m); 204 ret = spi_sync(codec->control_data, &m); 205 if (ret == 0) 206 reg_cache[reg] = value; 207 } 208 209 return ret; 210 } 211 212 /* 213 * read from the ad1836 register space cache 214 */ 215 static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec, 216 unsigned int reg) 217 { 218 u16 *reg_cache = codec->reg_cache; 219 220 if (reg >= codec->reg_cache_size) 221 return -EINVAL; 222 223 return reg_cache[reg]; 224 } 225 226 static int __devinit ad1836_spi_probe(struct spi_device *spi) 227 { 228 struct snd_soc_codec *codec; 229 struct ad1836_priv *ad1836; 230 231 ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL); 232 if (ad1836 == NULL) 233 return -ENOMEM; 234 235 codec = &ad1836->codec; 236 codec->control_data = spi; 237 codec->dev = &spi->dev; 238 239 dev_set_drvdata(&spi->dev, ad1836); 240 241 return ad1836_register(ad1836); 242 } 243 244 static int __devexit ad1836_spi_remove(struct spi_device *spi) 245 { 246 struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev); 247 248 ad1836_unregister(ad1836); 249 return 0; 250 } 251 252 static struct spi_driver ad1836_spi_driver = { 253 .driver = { 254 .name = "ad1836", 255 .owner = THIS_MODULE, 256 }, 257 .probe = ad1836_spi_probe, 258 .remove = __devexit_p(ad1836_spi_remove), 259 }; 260 261 static struct snd_soc_dai_ops ad1836_dai_ops = { 262 .hw_params = ad1836_hw_params, 263 .set_fmt = ad1836_set_dai_fmt, 264 }; 265 266 /* codec DAI instance */ 267 struct snd_soc_dai ad1836_dai = { 268 .name = "AD1836", 269 .playback = { 270 .stream_name = "Playback", 271 .channels_min = 2, 272 .channels_max = 6, 273 .rates = SNDRV_PCM_RATE_48000, 274 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE | 275 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE, 276 }, 277 .capture = { 278 .stream_name = "Capture", 279 .channels_min = 2, 280 .channels_max = 4, 281 .rates = SNDRV_PCM_RATE_48000, 282 .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE | 283 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE, 284 }, 285 .ops = &ad1836_dai_ops, 286 }; 287 EXPORT_SYMBOL_GPL(ad1836_dai); 288 289 static int ad1836_register(struct ad1836_priv *ad1836) 290 { 291 int ret; 292 struct snd_soc_codec *codec = &ad1836->codec; 293 294 if (ad1836_codec) { 295 dev_err(codec->dev, "Another ad1836 is registered\n"); 296 return -EINVAL; 297 } 298 299 mutex_init(&codec->mutex); 300 INIT_LIST_HEAD(&codec->dapm_widgets); 301 INIT_LIST_HEAD(&codec->dapm_paths); 302 codec->private_data = ad1836; 303 codec->reg_cache = ad1836->reg_cache; 304 codec->reg_cache_size = AD1836_NUM_REGS; 305 codec->name = "AD1836"; 306 codec->owner = THIS_MODULE; 307 codec->dai = &ad1836_dai; 308 codec->num_dai = 1; 309 codec->write = ad1836_write_reg; 310 codec->read = ad1836_read_reg_cache; 311 INIT_LIST_HEAD(&codec->dapm_widgets); 312 INIT_LIST_HEAD(&codec->dapm_paths); 313 314 ad1836_dai.dev = codec->dev; 315 ad1836_codec = codec; 316 317 /* default setting for ad1836 */ 318 /* de-emphasis: 48kHz, power-on dac */ 319 codec->write(codec, AD1836_DAC_CTRL1, 0x300); 320 /* unmute dac channels */ 321 codec->write(codec, AD1836_DAC_CTRL2, 0x0); 322 /* high-pass filter enable, power-on adc */ 323 codec->write(codec, AD1836_ADC_CTRL1, 0x100); 324 /* unmute adc channles, adc aux mode */ 325 codec->write(codec, AD1836_ADC_CTRL2, 0x180); 326 /* left/right diff:PGA/MUX */ 327 codec->write(codec, AD1836_ADC_CTRL3, 0x3A); 328 /* volume */ 329 codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF); 330 codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF); 331 codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF); 332 codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF); 333 codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF); 334 codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF); 335 336 ret = snd_soc_register_codec(codec); 337 if (ret != 0) { 338 dev_err(codec->dev, "Failed to register codec: %d\n", ret); 339 kfree(ad1836); 340 return ret; 341 } 342 343 ret = snd_soc_register_dai(&ad1836_dai); 344 if (ret != 0) { 345 dev_err(codec->dev, "Failed to register DAI: %d\n", ret); 346 snd_soc_unregister_codec(codec); 347 kfree(ad1836); 348 return ret; 349 } 350 351 return 0; 352 } 353 354 static void ad1836_unregister(struct ad1836_priv *ad1836) 355 { 356 snd_soc_unregister_dai(&ad1836_dai); 357 snd_soc_unregister_codec(&ad1836->codec); 358 kfree(ad1836); 359 ad1836_codec = NULL; 360 } 361 362 static int ad1836_probe(struct platform_device *pdev) 363 { 364 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 365 struct snd_soc_codec *codec; 366 int ret = 0; 367 368 if (ad1836_codec == NULL) { 369 dev_err(&pdev->dev, "Codec device not registered\n"); 370 return -ENODEV; 371 } 372 373 socdev->card->codec = ad1836_codec; 374 codec = ad1836_codec; 375 376 /* register pcms */ 377 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 378 if (ret < 0) { 379 dev_err(codec->dev, "failed to create pcms: %d\n", ret); 380 goto pcm_err; 381 } 382 383 snd_soc_add_controls(codec, ad1836_snd_controls, 384 ARRAY_SIZE(ad1836_snd_controls)); 385 snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets, 386 ARRAY_SIZE(ad1836_dapm_widgets)); 387 snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths)); 388 389 pcm_err: 390 return ret; 391 } 392 393 /* power down chip */ 394 static int ad1836_remove(struct platform_device *pdev) 395 { 396 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 397 398 snd_soc_free_pcms(socdev); 399 snd_soc_dapm_free(socdev); 400 401 return 0; 402 } 403 404 struct snd_soc_codec_device soc_codec_dev_ad1836 = { 405 .probe = ad1836_probe, 406 .remove = ad1836_remove, 407 }; 408 EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836); 409 410 static int __init ad1836_init(void) 411 { 412 int ret; 413 414 ret = spi_register_driver(&ad1836_spi_driver); 415 if (ret != 0) { 416 printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n", 417 ret); 418 } 419 420 return ret; 421 } 422 module_init(ad1836_init); 423 424 static void __exit ad1836_exit(void) 425 { 426 spi_unregister_driver(&ad1836_spi_driver); 427 } 428 module_exit(ad1836_exit); 429 430 MODULE_DESCRIPTION("ASoC ad1836 driver"); 431 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); 432 MODULE_LICENSE("GPL"); 433