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 <linux/slab.h> 14#include <sound/core.h> 15#include <sound/soc.h> 16#include <sound/initval.h> 17#include <linux/spi/spi.h> 18#include <sound/asoundef.h> 19 20#include "ak4104.h" 21 22/* AK4104 registers addresses */ 23#define AK4104_REG_CONTROL1 0x00 24#define AK4104_REG_RESERVED 0x01 25#define AK4104_REG_CONTROL2 0x02 26#define AK4104_REG_TX 0x03 27#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04) 28#define AK4104_NUM_REGS 10 29 30#define AK4104_REG_MASK 0x1f 31#define AK4104_READ 0xc0 32#define AK4104_WRITE 0xe0 33#define AK4104_RESERVED_VAL 0x5b 34 35/* Bit masks for AK4104 registers */ 36#define AK4104_CONTROL1_RSTN (1 << 0) 37#define AK4104_CONTROL1_PW (1 << 1) 38#define AK4104_CONTROL1_DIF0 (1 << 2) 39#define AK4104_CONTROL1_DIF1 (1 << 3) 40 41#define AK4104_CONTROL2_SEL0 (1 << 0) 42#define AK4104_CONTROL2_SEL1 (1 << 1) 43#define AK4104_CONTROL2_MODE (1 << 2) 44 45#define AK4104_TX_TXE (1 << 0) 46#define AK4104_TX_V (1 << 1) 47 48#define DRV_NAME "ak4104" 49 50struct ak4104_private { 51 struct snd_soc_codec codec; 52 u8 reg_cache[AK4104_NUM_REGS]; 53}; 54 55static int ak4104_fill_cache(struct snd_soc_codec *codec) 56{ 57 int i; 58 u8 *reg_cache = codec->reg_cache; 59 struct spi_device *spi = codec->control_data; 60 61 for (i = 0; i < codec->reg_cache_size; i++) { 62 int ret = spi_w8r8(spi, i | AK4104_READ); 63 if (ret < 0) { 64 dev_err(&spi->dev, "SPI write failure\n"); 65 return ret; 66 } 67 68 reg_cache[i] = ret; 69 } 70 71 return 0; 72} 73 74static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec, 75 unsigned int reg) 76{ 77 u8 *reg_cache = codec->reg_cache; 78 79 if (reg >= codec->reg_cache_size) 80 return -EINVAL; 81 82 return reg_cache[reg]; 83} 84 85static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg, 86 unsigned int value) 87{ 88 u8 *cache = codec->reg_cache; 89 struct spi_device *spi = codec->control_data; 90 91 if (reg >= codec->reg_cache_size) 92 return -EINVAL; 93 94 /* only write to the hardware if value has changed */ 95 if (cache[reg] != value) { 96 u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value }; 97 98 if (spi_write(spi, tmp, sizeof(tmp))) { 99 dev_err(&spi->dev, "SPI write failed\n"); 100 return -EIO; 101 } 102 103 cache[reg] = value; 104 } 105 106 return 0; 107} 108 109static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, 110 unsigned int format) 111{ 112 struct snd_soc_codec *codec = codec_dai->codec; 113 int val = 0; 114 115 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); 116 if (val < 0) 117 return val; 118 119 val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1); 120 121 /* set DAI format */ 122 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 123 case SND_SOC_DAIFMT_RIGHT_J: 124 break; 125 case SND_SOC_DAIFMT_LEFT_J: 126 val |= AK4104_CONTROL1_DIF0; 127 break; 128 case SND_SOC_DAIFMT_I2S: 129 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; 130 break; 131 default: 132 dev_err(codec->dev, "invalid dai format\n"); 133 return -EINVAL; 134 } 135 136 /* This device can only be slave */ 137 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) 138 return -EINVAL; 139 140 return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); 141} 142 143static int ak4104_hw_params(struct snd_pcm_substream *substream, 144 struct snd_pcm_hw_params *params, 145 struct snd_soc_dai *dai) 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 int val = 0; 151 152 /* set the IEC958 bits: consumer mode, no copyright bit */ 153 val |= IEC958_AES0_CON_NOT_COPYRIGHT; 154 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val); 155 156 val = 0; 157 158 switch (params_rate(params)) { 159 case 44100: 160 val |= IEC958_AES3_CON_FS_44100; 161 break; 162 case 48000: 163 val |= IEC958_AES3_CON_FS_48000; 164 break; 165 case 32000: 166 val |= IEC958_AES3_CON_FS_32000; 167 break; 168 default: 169 dev_err(codec->dev, "unsupported sampling rate\n"); 170 return -EINVAL; 171 } 172 173 return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val); 174} 175 176static struct snd_soc_dai_ops ak4101_dai_ops = { 177 .hw_params = ak4104_hw_params, 178 .set_fmt = ak4104_set_dai_fmt, 179}; 180 181struct snd_soc_dai ak4104_dai = { 182 .name = DRV_NAME, 183 .playback = { 184 .stream_name = "Playback", 185 .channels_min = 2, 186 .channels_max = 2, 187 .rates = SNDRV_PCM_RATE_8000_192000, 188 .formats = SNDRV_PCM_FMTBIT_S16_LE | 189 SNDRV_PCM_FMTBIT_S24_3LE | 190 SNDRV_PCM_FMTBIT_S24_LE 191 }, 192 .ops = &ak4101_dai_ops, 193}; 194 195static struct snd_soc_codec *ak4104_codec; 196 197static int ak4104_spi_probe(struct spi_device *spi) 198{ 199 struct snd_soc_codec *codec; 200 struct ak4104_private *ak4104; 201 int ret, val; 202 203 spi->bits_per_word = 8; 204 spi->mode = SPI_MODE_0; 205 ret = spi_setup(spi); 206 if (ret < 0) 207 return ret; 208 209 ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL); 210 if (!ak4104) { 211 dev_err(&spi->dev, "could not allocate codec\n"); 212 return -ENOMEM; 213 } 214 215 codec = &ak4104->codec; 216 mutex_init(&codec->mutex); 217 INIT_LIST_HEAD(&codec->dapm_widgets); 218 INIT_LIST_HEAD(&codec->dapm_paths); 219 220 codec->dev = &spi->dev; 221 codec->name = DRV_NAME; 222 codec->owner = THIS_MODULE; 223 codec->dai = &ak4104_dai; 224 codec->num_dai = 1; 225 snd_soc_codec_set_drvdata(codec, ak4104); 226 codec->control_data = spi; 227 codec->reg_cache = ak4104->reg_cache; 228 codec->reg_cache_size = AK4104_NUM_REGS; 229 230 /* read all regs and fill the cache */ 231 ret = ak4104_fill_cache(codec); 232 if (ret < 0) { 233 dev_err(&spi->dev, "failed to fill register cache\n"); 234 return ret; 235 } 236 237 /* read the 'reserved' register - according to the datasheet, it 238 * should contain 0x5b. Not a good way to verify the presence of 239 * the device, but there is no hardware ID register. */ 240 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) != 241 AK4104_RESERVED_VAL) { 242 ret = -ENODEV; 243 goto error_free_codec; 244 } 245 246 /* set power-up and non-reset bits */ 247 val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); 248 val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN; 249 ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); 250 if (ret < 0) 251 goto error_free_codec; 252 253 /* enable transmitter */ 254 val = ak4104_read_reg_cache(codec, AK4104_REG_TX); 255 val |= AK4104_TX_TXE; 256 ret = ak4104_spi_write(codec, AK4104_REG_TX, val); 257 if (ret < 0) 258 goto error_free_codec; 259 260 ak4104_codec = codec; 261 ret = snd_soc_register_dai(&ak4104_dai); 262 if (ret < 0) { 263 dev_err(&spi->dev, "failed to register DAI\n"); 264 goto error_free_codec; 265 } 266 267 spi_set_drvdata(spi, ak4104); 268 dev_info(&spi->dev, "SPI device initialized\n"); 269 return 0; 270 271error_free_codec: 272 kfree(ak4104); 273 ak4104_dai.dev = NULL; 274 return ret; 275} 276 277static int __devexit ak4104_spi_remove(struct spi_device *spi) 278{ 279 int ret, val; 280 struct ak4104_private *ak4104 = spi_get_drvdata(spi); 281 282 val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1); 283 if (val < 0) 284 return val; 285 286 /* clear power-up and non-reset bits */ 287 val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 288 ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val); 289 if (ret < 0) 290 return ret; 291 292 ak4104_codec = NULL; 293 kfree(ak4104); 294 return 0; 295} 296 297static int ak4104_probe(struct platform_device *pdev) 298{ 299 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 300 struct snd_soc_codec *codec = ak4104_codec; 301 int ret; 302 303 /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */ 304 socdev->card->codec = codec; 305 306 /* Register PCMs */ 307 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); 308 if (ret < 0) { 309 dev_err(codec->dev, "failed to create pcms\n"); 310 return ret; 311 } 312 313 return 0; 314} 315 316static int ak4104_remove(struct platform_device *pdev) 317{ 318 struct snd_soc_device *socdev = platform_get_drvdata(pdev); 319 snd_soc_free_pcms(socdev); 320 return 0; 321}; 322 323struct snd_soc_codec_device soc_codec_device_ak4104 = { 324 .probe = ak4104_probe, 325 .remove = ak4104_remove 326}; 327EXPORT_SYMBOL_GPL(soc_codec_device_ak4104); 328 329static struct spi_driver ak4104_spi_driver = { 330 .driver = { 331 .name = DRV_NAME, 332 .owner = THIS_MODULE, 333 }, 334 .probe = ak4104_spi_probe, 335 .remove = __devexit_p(ak4104_spi_remove), 336}; 337 338static int __init ak4104_init(void) 339{ 340 pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n"); 341 return spi_register_driver(&ak4104_spi_driver); 342} 343module_init(ak4104_init); 344 345static void __exit ak4104_exit(void) 346{ 347 spi_unregister_driver(&ak4104_spi_driver); 348} 349module_exit(ak4104_exit); 350 351MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 352MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 353MODULE_LICENSE("GPL"); 354