1 /* 2 * AK4104 ALSA SoC (ASoC) driver 3 * 4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12 #include <linux/module.h> 13 #include <sound/core.h> 14 #include <sound/soc.h> 15 #include <sound/initval.h> 16 #include <linux/spi/spi.h> 17 #include <sound/asoundef.h> 18 19 #include "ak4104.h" 20 21 /* AK4104 registers addresses */ 22 #define AK4104_REG_CONTROL1 0x00 23 #define AK4104_REG_RESERVED 0x01 24 #define AK4104_REG_CONTROL2 0x02 25 #define AK4104_REG_TX 0x03 26 #define AK4104_REG_CHN_STATUS(x) ((x) + 0x04) 27 #define AK4104_NUM_REGS 10 28 29 #define AK4104_REG_MASK 0x1f 30 #define AK4104_READ 0xc0 31 #define AK4104_WRITE 0xe0 32 #define AK4104_RESERVED_VAL 0x5b 33 34 /* Bit masks for AK4104 registers */ 35 #define AK4104_CONTROL1_RSTN (1 << 0) 36 #define AK4104_CONTROL1_PW (1 << 1) 37 #define AK4104_CONTROL1_DIF0 (1 << 2) 38 #define AK4104_CONTROL1_DIF1 (1 << 3) 39 40 #define AK4104_CONTROL2_SEL0 (1 << 0) 41 #define AK4104_CONTROL2_SEL1 (1 << 1) 42 #define AK4104_CONTROL2_MODE (1 << 2) 43 44 #define AK4104_TX_TXE (1 << 0) 45 #define AK4104_TX_V (1 << 1) 46 47 #define DRV_NAME "ak4104" 48 49 struct ak4104_private { 50 struct snd_soc_codec codec; 51 u8 reg_cache[AK4104_NUM_REGS]; 52 }; 53 54 static int ak4104_fill_cache(struct snd_soc_codec *codec) 55 { 56 int i; 57 u8 *reg_cache = codec->reg_cache; 58 struct spi_device *spi = codec->control_data; 59 60 for (i = 0; i < codec->reg_cache_size; i++) { 61 int ret = spi_w8r8(spi, i | AK4104_READ); 62 if (ret < 0) { 63 dev_err(&spi->dev, "SPI write failure\n"); 64 return ret; 65 } 66 67 reg_cache[i] = ret; 68 } 69 70 return 0; 71 } 72 73 static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec, 74 unsigned int reg) 75 { 76 u8 *reg_cache = codec->reg_cache; 77 78 if (reg >= codec->reg_cache_size) 79 return -EINVAL; 80 81 return reg_cache[reg]; 82 } 83 84 static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg, 85 unsigned int value) 86 { 87 u8 *cache = codec->reg_cache; 88 struct spi_device *spi = codec->control_data; 89 90 if (reg >= codec->reg_cache_size) 91 return -EINVAL; 92 93 reg &= AK4104_REG_MASK; 94 reg |= AK4104_WRITE; 95 96 /* only write to the hardware if value has changed */ 97 if (cache[reg] != value) { 98 u8 tmp[2] = { reg, value }; 99 if (spi_write(spi, tmp, sizeof(tmp))) { 100 dev_err(&spi->dev, "SPI write failed\n"); 101 return -EIO; 102 } 103 104 cache[reg] = value; 105 } 106 107 return 0; 108 } 109 110 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, 111 unsigned int format) 112 { 113 struct snd_soc_codec *codec = codec_dai->codec; 114 int val = 0; 115 116 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); 117 if (val < 0) 118 return val; 119 120 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1); 121 122 /* set DAI format */ 123 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 124 case SND_SOC_DAIFMT_RIGHT_J: 125 break; 126 case SND_SOC_DAIFMT_LEFT_J: 127 val |= AK4104_CONTROL1_DIF0; 128 break; 129 case SND_SOC_DAIFMT_I2S: 130 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; 131 break; 132 default: 133 dev_err(codec->dev, "invalid dai format\n"); 134 return -EINVAL; 135 } 136 137 /* This device can only be slave */ 138 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) 139 return -EINVAL; 140 141 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); 142 } 143 144 static int ak4104_hw_params(struct snd_pcm_substream *substream, 145 struct snd_pcm_hw_params *params, 146 struct snd_soc_dai *dai) 147 { 148 struct snd_soc_pcm_runtime *rtd = substream->private_data; 149 struct snd_soc_device *socdev = rtd->socdev; 150 struct snd_soc_codec *codec = socdev->card->codec; 151 int val = 0; 152 153 /* set the IEC958 bits: consumer mode, no copyright bit */ 154 val |= IEC958_AES0_CON_NOT_COPYRIGHT; 155 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val); 156 157 val = 0; 158 159 switch (params_rate(params)) { 160 case 44100: 161 val |= IEC958_AES3_CON_FS_44100; 162 break; 163 case 48000: 164 val |= IEC958_AES3_CON_FS_48000; 165 break; 166 case 32000: 167 val |= IEC958_AES3_CON_FS_32000; 168 break; 169 default: 170 dev_err(codec->dev, "unsupported sampling rate\n"); 171 return -EINVAL; 172 } 173 174 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val); 175 } 176 177 static struct snd_soc_dai_ops ak4101_dai_ops = { 178 .hw_params = ak4104_hw_params, 179 .set_fmt = ak4104_set_dai_fmt, 180 }; 181 182 struct snd_soc_dai ak4104_dai = { 183 .name = DRV_NAME, 184 .playback = { 185 .stream_name = "Playback", 186 .channels_min = 2, 187 .channels_max = 2, 188 .rates = SNDRV_PCM_RATE_44100 | 189 SNDRV_PCM_RATE_48000 | 190 SNDRV_PCM_RATE_32000, 191 .formats = SNDRV_PCM_FMTBIT_S16_LE | 192 SNDRV_PCM_FMTBIT_S24_3LE | 193 SNDRV_PCM_FMTBIT_S24_LE 194 }, 195 .ops = &ak4101_dai_ops, 196 }; 197 198 static struct snd_soc_codec *ak4104_codec; 199 200 static int ak4104_spi_probe(struct spi_device *spi) 201 { 202 struct snd_soc_codec *codec; 203 struct ak4104_private *ak4104; 204 int ret, val; 205 206 spi->bits_per_word = 8; 207 spi->mode = SPI_MODE_0; 208 ret = spi_setup(spi); 209 if (ret < 0) 210 return ret; 211 212 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL); 213 if (!ak4104) { 214 dev_err(&spi->dev, "could not allocate codec\n"); 215 return -ENOMEM; 216 } 217 218 codec = &ak4104->codec; 219 mutex_init(&codec->mutex); 220 INIT_LIST_HEAD(&codec->dapm_widgets); 221 INIT_LIST_HEAD(&codec->dapm_paths); 222 223 codec->dev = &spi->dev; 224 codec->name = DRV_NAME; 225 codec->owner = THIS_MODULE; 226 codec->dai = &ak4104_dai; 227 codec->num_dai = 1; 228 codec->private_data = ak4104; 229 codec->control_data = spi; 230 codec->reg_cache = ak4104->reg_cache; 231 codec->reg_cache_size = AK4104_NUM_REGS; 232 233 /* read all regs and fill the cache */ 234 ret = ak4104_fill_cache(codec); 235 if (ret < 0) { 236 dev_err(&spi->dev, "failed to fill register cache\n"); 237 return ret; 238 } 239 240 /* read the 'reserved' register - according to the datasheet, it 241 * should contain 0x5b. Not a good way to verify the presence of 242 * the device, but there is no hardware ID register. */ 243 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) != 244 AK4104_RESERVED_VAL) { 245 ret = -ENODEV; 246 goto error_free_codec; 247 } 248 249 /* set power-up and non-reset bits */ 250 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); 251 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN; 252 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); 253 if (ret < 0) 254 goto error_free_codec; 255 256 /* enable transmitter */ 257 val = ak4104_read_reg_cache(codec, AK4104_REG_TX); 258 val |= AK4104_TX_TXE; 259 ret = ak4104_spi_write(codec, AK4104_REG_TX, val); 260 if (ret < 0) 261 goto error_free_codec; 262 263 ak4104_codec = codec; 264 ret = snd_soc_register_dai(&ak4104_dai); 265 if (ret < 0) { 266 dev_err(&spi->dev, "failed to register DAI\n"); 267 goto error_free_codec; 268 } 269 270 spi_set_drvdata(spi, ak4104); 271 dev_info(&spi->dev, "SPI device initialized\n"); 272 return 0; 273 274 error_free_codec: 275 kfree(ak4104); 276 ak4104_dai.dev = NULL; 277 return ret; 278 } 279 280 static int __devexit ak4104_spi_remove(struct spi_device *spi) 281 { 282 int ret, val; 283 struct ak4104_private *ak4104 = spi_get_drvdata(spi); 284 285 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1); 286 if (val < 0) 287 return val; 288 289 /* clear power-up and non-reset bits */ 290 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 291 ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val); 292 if (ret < 0) 293 return ret; 294 295 ak4104_codec = NULL; 296 kfree(ak4104); 297 return 0; 298 } 299 300 static int ak4104_probe(struct platform_device *pdev) 301 { 302 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 303 struct snd_soc_codec *codec = ak4104_codec; 304 int ret; 305 306 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */ 307 socdev->card->codec = codec; 308 309 /* Register PCMs */ 310 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 311 if (ret < 0) { 312 dev_err(codec->dev, "failed to create pcms\n"); 313 return ret; 314 } 315 316 /* Register the socdev */ 317 ret = snd_soc_init_card(socdev); 318 if (ret < 0) { 319 dev_err(codec->dev, "failed to register card\n"); 320 snd_soc_free_pcms(socdev); 321 return ret; 322 } 323 324 return 0; 325 } 326 327 static int ak4104_remove(struct platform_device *pdev) 328 { 329 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 330 snd_soc_free_pcms(socdev); 331 return 0; 332 }; 333 334 struct snd_soc_codec_device soc_codec_device_ak4104 = { 335 .probe = ak4104_probe, 336 .remove = ak4104_remove 337 }; 338 EXPORT_SYMBOL_GPL(soc_codec_device_ak4104); 339 340 static struct spi_driver ak4104_spi_driver = { 341 .driver = { 342 .name = DRV_NAME, 343 .owner = THIS_MODULE, 344 }, 345 .probe = ak4104_spi_probe, 346 .remove = __devexit_p(ak4104_spi_remove), 347 }; 348 349 static int __init ak4104_init(void) 350 { 351 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n"); 352 return spi_register_driver(&ak4104_spi_driver); 353 } 354 module_init(ak4104_init); 355 356 static void __exit ak4104_exit(void) 357 { 358 spi_unregister_driver(&ak4104_spi_driver); 359 } 360 module_exit(ak4104_exit); 361 362 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 363 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 364 MODULE_LICENSE("GPL"); 365 366