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 /* only write to the hardware if value has changed */ 94 if (cache[reg] != value) { 95 u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value }; 96 97 if (spi_write(spi, tmp, sizeof(tmp))) { 98 dev_err(&spi->dev, "SPI write failed\n"); 99 return -EIO; 100 } 101 102 cache[reg] = value; 103 } 104 105 return 0; 106 } 107 108 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, 109 unsigned int format) 110 { 111 struct snd_soc_codec *codec = codec_dai->codec; 112 int val = 0; 113 114 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); 115 if (val < 0) 116 return val; 117 118 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1); 119 120 /* set DAI format */ 121 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 122 case SND_SOC_DAIFMT_RIGHT_J: 123 break; 124 case SND_SOC_DAIFMT_LEFT_J: 125 val |= AK4104_CONTROL1_DIF0; 126 break; 127 case SND_SOC_DAIFMT_I2S: 128 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; 129 break; 130 default: 131 dev_err(codec->dev, "invalid dai format\n"); 132 return -EINVAL; 133 } 134 135 /* This device can only be slave */ 136 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) 137 return -EINVAL; 138 139 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); 140 } 141 142 static int ak4104_hw_params(struct snd_pcm_substream *substream, 143 struct snd_pcm_hw_params *params, 144 struct snd_soc_dai *dai) 145 { 146 struct snd_soc_pcm_runtime *rtd = substream->private_data; 147 struct snd_soc_device *socdev = rtd->socdev; 148 struct snd_soc_codec *codec = socdev->card->codec; 149 int val = 0; 150 151 /* set the IEC958 bits: consumer mode, no copyright bit */ 152 val |= IEC958_AES0_CON_NOT_COPYRIGHT; 153 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val); 154 155 val = 0; 156 157 switch (params_rate(params)) { 158 case 44100: 159 val |= IEC958_AES3_CON_FS_44100; 160 break; 161 case 48000: 162 val |= IEC958_AES3_CON_FS_48000; 163 break; 164 case 32000: 165 val |= IEC958_AES3_CON_FS_32000; 166 break; 167 default: 168 dev_err(codec->dev, "unsupported sampling rate\n"); 169 return -EINVAL; 170 } 171 172 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val); 173 } 174 175 static struct snd_soc_dai_ops ak4101_dai_ops = { 176 .hw_params = ak4104_hw_params, 177 .set_fmt = ak4104_set_dai_fmt, 178 }; 179 180 struct snd_soc_dai ak4104_dai = { 181 .name = DRV_NAME, 182 .playback = { 183 .stream_name = "Playback", 184 .channels_min = 2, 185 .channels_max = 2, 186 .rates = SNDRV_PCM_RATE_8000_192000, 187 .formats = SNDRV_PCM_FMTBIT_S16_LE | 188 SNDRV_PCM_FMTBIT_S24_3LE | 189 SNDRV_PCM_FMTBIT_S24_LE 190 }, 191 .ops = &ak4101_dai_ops, 192 }; 193 194 static struct snd_soc_codec *ak4104_codec; 195 196 static int ak4104_spi_probe(struct spi_device *spi) 197 { 198 struct snd_soc_codec *codec; 199 struct ak4104_private *ak4104; 200 int ret, val; 201 202 spi->bits_per_word = 8; 203 spi->mode = SPI_MODE_0; 204 ret = spi_setup(spi); 205 if (ret < 0) 206 return ret; 207 208 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL); 209 if (!ak4104) { 210 dev_err(&spi->dev, "could not allocate codec\n"); 211 return -ENOMEM; 212 } 213 214 codec = &ak4104->codec; 215 mutex_init(&codec->mutex); 216 INIT_LIST_HEAD(&codec->dapm_widgets); 217 INIT_LIST_HEAD(&codec->dapm_paths); 218 219 codec->dev = &spi->dev; 220 codec->name = DRV_NAME; 221 codec->owner = THIS_MODULE; 222 codec->dai = &ak4104_dai; 223 codec->num_dai = 1; 224 snd_soc_codec_set_drvdata(codec, ak4104); 225 codec->control_data = spi; 226 codec->reg_cache = ak4104->reg_cache; 227 codec->reg_cache_size = AK4104_NUM_REGS; 228 229 /* read all regs and fill the cache */ 230 ret = ak4104_fill_cache(codec); 231 if (ret < 0) { 232 dev_err(&spi->dev, "failed to fill register cache\n"); 233 return ret; 234 } 235 236 /* read the 'reserved' register - according to the datasheet, it 237 * should contain 0x5b. Not a good way to verify the presence of 238 * the device, but there is no hardware ID register. */ 239 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) != 240 AK4104_RESERVED_VAL) { 241 ret = -ENODEV; 242 goto error_free_codec; 243 } 244 245 /* set power-up and non-reset bits */ 246 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); 247 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN; 248 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); 249 if (ret < 0) 250 goto error_free_codec; 251 252 /* enable transmitter */ 253 val = ak4104_read_reg_cache(codec, AK4104_REG_TX); 254 val |= AK4104_TX_TXE; 255 ret = ak4104_spi_write(codec, AK4104_REG_TX, val); 256 if (ret < 0) 257 goto error_free_codec; 258 259 ak4104_codec = codec; 260 ret = snd_soc_register_dai(&ak4104_dai); 261 if (ret < 0) { 262 dev_err(&spi->dev, "failed to register DAI\n"); 263 goto error_free_codec; 264 } 265 266 spi_set_drvdata(spi, ak4104); 267 dev_info(&spi->dev, "SPI device initialized\n"); 268 return 0; 269 270 error_free_codec: 271 kfree(ak4104); 272 ak4104_dai.dev = NULL; 273 return ret; 274 } 275 276 static int __devexit ak4104_spi_remove(struct spi_device *spi) 277 { 278 int ret, val; 279 struct ak4104_private *ak4104 = spi_get_drvdata(spi); 280 281 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1); 282 if (val < 0) 283 return val; 284 285 /* clear power-up and non-reset bits */ 286 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 287 ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val); 288 if (ret < 0) 289 return ret; 290 291 ak4104_codec = NULL; 292 kfree(ak4104); 293 return 0; 294 } 295 296 static int ak4104_probe(struct platform_device *pdev) 297 { 298 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 299 struct snd_soc_codec *codec = ak4104_codec; 300 int ret; 301 302 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */ 303 socdev->card->codec = codec; 304 305 /* Register PCMs */ 306 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 307 if (ret < 0) { 308 dev_err(codec->dev, "failed to create pcms\n"); 309 return ret; 310 } 311 312 return 0; 313 } 314 315 static int ak4104_remove(struct platform_device *pdev) 316 { 317 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 318 snd_soc_free_pcms(socdev); 319 return 0; 320 }; 321 322 struct snd_soc_codec_device soc_codec_device_ak4104 = { 323 .probe = ak4104_probe, 324 .remove = ak4104_remove 325 }; 326 EXPORT_SYMBOL_GPL(soc_codec_device_ak4104); 327 328 static struct spi_driver ak4104_spi_driver = { 329 .driver = { 330 .name = DRV_NAME, 331 .owner = THIS_MODULE, 332 }, 333 .probe = ak4104_spi_probe, 334 .remove = __devexit_p(ak4104_spi_remove), 335 }; 336 337 static int __init ak4104_init(void) 338 { 339 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n"); 340 return spi_register_driver(&ak4104_spi_driver); 341 } 342 module_init(ak4104_init); 343 344 static void __exit ak4104_exit(void) 345 { 346 spi_unregister_driver(&ak4104_spi_driver); 347 } 348 module_exit(ak4104_exit); 349 350 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 351 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 352 MODULE_LICENSE("GPL"); 353 354