1 /* 2 * Texas Instruments TLV320AIC26 low power audio CODEC 3 * ALSA SoC CODEC driver 4 * 5 * Copyright (C) 2008 Secret Lab Technologies Ltd. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/moduleparam.h> 10 #include <linux/init.h> 11 #include <linux/delay.h> 12 #include <linux/pm.h> 13 #include <linux/device.h> 14 #include <linux/sysfs.h> 15 #include <linux/spi/spi.h> 16 #include <linux/slab.h> 17 #include <sound/core.h> 18 #include <sound/pcm.h> 19 #include <sound/pcm_params.h> 20 #include <sound/soc.h> 21 #include <sound/initval.h> 22 23 #include "tlv320aic26.h" 24 25 MODULE_DESCRIPTION("ASoC TLV320AIC26 codec driver"); 26 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); 27 MODULE_LICENSE("GPL"); 28 29 /* AIC26 driver private data */ 30 struct aic26 { 31 struct spi_device *spi; 32 struct regmap *regmap; 33 struct snd_soc_codec *codec; 34 int master; 35 int datfm; 36 int mclk; 37 38 /* Keyclick parameters */ 39 int keyclick_amplitude; 40 int keyclick_freq; 41 int keyclick_len; 42 }; 43 44 static const struct snd_soc_dapm_widget tlv320aic26_dapm_widgets[] = { 45 SND_SOC_DAPM_INPUT("MICIN"), 46 SND_SOC_DAPM_INPUT("AUX"), 47 48 SND_SOC_DAPM_OUTPUT("HPL"), 49 SND_SOC_DAPM_OUTPUT("HPR"), 50 }; 51 52 static const struct snd_soc_dapm_route tlv320aic26_dapm_routes[] = { 53 { "Capture", NULL, "MICIN" }, 54 { "Capture", NULL, "AUX" }, 55 56 { "HPL", NULL, "Playback" }, 57 { "HPR", NULL, "Playback" }, 58 }; 59 60 /* --------------------------------------------------------------------- 61 * Digital Audio Interface Operations 62 */ 63 static int aic26_hw_params(struct snd_pcm_substream *substream, 64 struct snd_pcm_hw_params *params, 65 struct snd_soc_dai *dai) 66 { 67 struct snd_soc_codec *codec = dai->codec; 68 struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec); 69 int fsref, divisor, wlen, pval, jval, dval, qval; 70 u16 reg; 71 72 dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n", 73 substream, params); 74 dev_dbg(&aic26->spi->dev, "rate=%i width=%d\n", params_rate(params), 75 params_width(params)); 76 77 switch (params_rate(params)) { 78 case 8000: fsref = 48000; divisor = AIC26_DIV_6; break; 79 case 11025: fsref = 44100; divisor = AIC26_DIV_4; break; 80 case 12000: fsref = 48000; divisor = AIC26_DIV_4; break; 81 case 16000: fsref = 48000; divisor = AIC26_DIV_3; break; 82 case 22050: fsref = 44100; divisor = AIC26_DIV_2; break; 83 case 24000: fsref = 48000; divisor = AIC26_DIV_2; break; 84 case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break; 85 case 44100: fsref = 44100; divisor = AIC26_DIV_1; break; 86 case 48000: fsref = 48000; divisor = AIC26_DIV_1; break; 87 default: 88 dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL; 89 } 90 91 /* select data word length */ 92 switch (params_width(params)) { 93 case 8: wlen = AIC26_WLEN_16; break; 94 case 16: wlen = AIC26_WLEN_16; break; 95 case 24: wlen = AIC26_WLEN_24; break; 96 case 32: wlen = AIC26_WLEN_32; break; 97 default: 98 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL; 99 } 100 101 /** 102 * Configure PLL 103 * fsref = (mclk * PLLM) / 2048 104 * where PLLM = J.DDDD (DDDD register ranges from 0 to 9999, decimal) 105 */ 106 pval = 1; 107 /* compute J portion of multiplier */ 108 jval = fsref / (aic26->mclk / 2048); 109 /* compute fractional DDDD component of multiplier */ 110 dval = fsref - (jval * (aic26->mclk / 2048)); 111 dval = (10000 * dval) / (aic26->mclk / 2048); 112 dev_dbg(&aic26->spi->dev, "Setting PLLM to %d.%04d\n", jval, dval); 113 qval = 0; 114 reg = 0x8000 | qval << 11 | pval << 8 | jval << 2; 115 snd_soc_write(codec, AIC26_REG_PLL_PROG1, reg); 116 reg = dval << 2; 117 snd_soc_write(codec, AIC26_REG_PLL_PROG2, reg); 118 119 /* Audio Control 3 (master mode, fsref rate) */ 120 if (aic26->master) 121 reg = 0x0800; 122 if (fsref == 48000) 123 reg = 0x2000; 124 snd_soc_update_bits(codec, AIC26_REG_AUDIO_CTRL3, 0xf800, reg); 125 126 /* Audio Control 1 (FSref divisor) */ 127 reg = wlen | aic26->datfm | (divisor << 3) | divisor; 128 snd_soc_update_bits(codec, AIC26_REG_AUDIO_CTRL1, 0xfff, reg); 129 130 return 0; 131 } 132 133 /** 134 * aic26_mute - Mute control to reduce noise when changing audio format 135 */ 136 static int aic26_mute(struct snd_soc_dai *dai, int mute) 137 { 138 struct snd_soc_codec *codec = dai->codec; 139 struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec); 140 u16 reg; 141 142 dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n", 143 dai, mute); 144 145 if (mute) 146 reg = 0x8080; 147 else 148 reg = 0; 149 snd_soc_update_bits(codec, AIC26_REG_DAC_GAIN, 0x8000, reg); 150 151 return 0; 152 } 153 154 static int aic26_set_sysclk(struct snd_soc_dai *codec_dai, 155 int clk_id, unsigned int freq, int dir) 156 { 157 struct snd_soc_codec *codec = codec_dai->codec; 158 struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec); 159 160 dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i," 161 " freq=%i, dir=%i)\n", 162 codec_dai, clk_id, freq, dir); 163 164 /* MCLK needs to fall between 2MHz and 50 MHz */ 165 if ((freq < 2000000) || (freq > 50000000)) 166 return -EINVAL; 167 168 aic26->mclk = freq; 169 return 0; 170 } 171 172 static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) 173 { 174 struct snd_soc_codec *codec = codec_dai->codec; 175 struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec); 176 177 dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n", 178 codec_dai, fmt); 179 180 /* set master/slave audio interface */ 181 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 182 case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break; 183 case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break; 184 default: 185 dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL; 186 } 187 188 /* interface format */ 189 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 190 case SND_SOC_DAIFMT_I2S: aic26->datfm = AIC26_DATFM_I2S; break; 191 case SND_SOC_DAIFMT_DSP_A: aic26->datfm = AIC26_DATFM_DSP; break; 192 case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break; 193 case SND_SOC_DAIFMT_LEFT_J: aic26->datfm = AIC26_DATFM_LEFTJ; break; 194 default: 195 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL; 196 } 197 198 return 0; 199 } 200 201 /* --------------------------------------------------------------------- 202 * Digital Audio Interface Definition 203 */ 204 #define AIC26_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 205 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\ 206 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\ 207 SNDRV_PCM_RATE_48000) 208 #define AIC26_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |\ 209 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE) 210 211 static const struct snd_soc_dai_ops aic26_dai_ops = { 212 .hw_params = aic26_hw_params, 213 .digital_mute = aic26_mute, 214 .set_sysclk = aic26_set_sysclk, 215 .set_fmt = aic26_set_fmt, 216 }; 217 218 static struct snd_soc_dai_driver aic26_dai = { 219 .name = "tlv320aic26-hifi", 220 .playback = { 221 .stream_name = "Playback", 222 .channels_min = 2, 223 .channels_max = 2, 224 .rates = AIC26_RATES, 225 .formats = AIC26_FORMATS, 226 }, 227 .capture = { 228 .stream_name = "Capture", 229 .channels_min = 2, 230 .channels_max = 2, 231 .rates = AIC26_RATES, 232 .formats = AIC26_FORMATS, 233 }, 234 .ops = &aic26_dai_ops, 235 }; 236 237 /* --------------------------------------------------------------------- 238 * ALSA controls 239 */ 240 static const char *aic26_capture_src_text[] = {"Mic", "Aux"}; 241 static SOC_ENUM_SINGLE_DECL(aic26_capture_src_enum, 242 AIC26_REG_AUDIO_CTRL1, 12, 243 aic26_capture_src_text); 244 245 static const struct snd_kcontrol_new aic26_snd_controls[] = { 246 /* Output */ 247 SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1), 248 SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1), 249 SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0), 250 SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1), 251 SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0), 252 SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0), 253 SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0), 254 SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0), 255 SOC_ENUM("Capture Source", aic26_capture_src_enum), 256 }; 257 258 /* --------------------------------------------------------------------- 259 * SPI device portion of driver: sysfs files for debugging 260 */ 261 262 static ssize_t aic26_keyclick_show(struct device *dev, 263 struct device_attribute *attr, char *buf) 264 { 265 struct aic26 *aic26 = dev_get_drvdata(dev); 266 int val, amp, freq, len; 267 268 val = snd_soc_read(aic26->codec, AIC26_REG_AUDIO_CTRL2); 269 amp = (val >> 12) & 0x7; 270 freq = (125 << ((val >> 8) & 0x7)) >> 1; 271 len = 2 * (1 + ((val >> 4) & 0xf)); 272 273 return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len); 274 } 275 276 /* Any write to the keyclick attribute will trigger the keyclick event */ 277 static ssize_t aic26_keyclick_set(struct device *dev, 278 struct device_attribute *attr, 279 const char *buf, size_t count) 280 { 281 struct aic26 *aic26 = dev_get_drvdata(dev); 282 283 snd_soc_update_bits(aic26->codec, AIC26_REG_AUDIO_CTRL2, 284 0x8000, 0x800); 285 286 return count; 287 } 288 289 static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set); 290 291 /* --------------------------------------------------------------------- 292 * SoC CODEC portion of driver: probe and release routines 293 */ 294 static int aic26_probe(struct snd_soc_codec *codec) 295 { 296 struct aic26 *aic26 = dev_get_drvdata(codec->dev); 297 int ret, reg; 298 299 aic26->codec = codec; 300 301 /* Reset the codec to power on defaults */ 302 snd_soc_write(codec, AIC26_REG_RESET, 0xBB00); 303 304 /* Power up CODEC */ 305 snd_soc_write(codec, AIC26_REG_POWER_CTRL, 0); 306 307 /* Audio Control 3 (master mode, fsref rate) */ 308 reg = snd_soc_read(codec, AIC26_REG_AUDIO_CTRL3); 309 reg &= ~0xf800; 310 reg |= 0x0800; /* set master mode */ 311 snd_soc_write(codec, AIC26_REG_AUDIO_CTRL3, reg); 312 313 /* Register the sysfs files for debugging */ 314 /* Create SysFS files */ 315 ret = device_create_file(codec->dev, &dev_attr_keyclick); 316 if (ret) 317 dev_info(codec->dev, "error creating sysfs files\n"); 318 319 return 0; 320 } 321 322 static struct snd_soc_codec_driver aic26_soc_codec_dev = { 323 .probe = aic26_probe, 324 .controls = aic26_snd_controls, 325 .num_controls = ARRAY_SIZE(aic26_snd_controls), 326 .dapm_widgets = tlv320aic26_dapm_widgets, 327 .num_dapm_widgets = ARRAY_SIZE(tlv320aic26_dapm_widgets), 328 .dapm_routes = tlv320aic26_dapm_routes, 329 .num_dapm_routes = ARRAY_SIZE(tlv320aic26_dapm_routes), 330 }; 331 332 static const struct regmap_config aic26_regmap = { 333 .reg_bits = 16, 334 .val_bits = 16, 335 }; 336 337 /* --------------------------------------------------------------------- 338 * SPI device portion of driver: probe and release routines and SPI 339 * driver registration. 340 */ 341 static int aic26_spi_probe(struct spi_device *spi) 342 { 343 struct aic26 *aic26; 344 int ret; 345 346 dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n"); 347 348 /* Allocate driver data */ 349 aic26 = devm_kzalloc(&spi->dev, sizeof *aic26, GFP_KERNEL); 350 if (!aic26) 351 return -ENOMEM; 352 353 aic26->regmap = devm_regmap_init_spi(spi, &aic26_regmap); 354 if (IS_ERR(aic26->regmap)) 355 return PTR_ERR(aic26->regmap); 356 357 /* Initialize the driver data */ 358 aic26->spi = spi; 359 dev_set_drvdata(&spi->dev, aic26); 360 aic26->master = 1; 361 362 ret = snd_soc_register_codec(&spi->dev, 363 &aic26_soc_codec_dev, &aic26_dai, 1); 364 return ret; 365 } 366 367 static int aic26_spi_remove(struct spi_device *spi) 368 { 369 snd_soc_unregister_codec(&spi->dev); 370 return 0; 371 } 372 373 static struct spi_driver aic26_spi = { 374 .driver = { 375 .name = "tlv320aic26-codec", 376 .owner = THIS_MODULE, 377 }, 378 .probe = aic26_spi_probe, 379 .remove = aic26_spi_remove, 380 }; 381 382 module_spi_driver(aic26_spi); 383