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 /* AK4104 registers addresses */ 21 #define AK4104_REG_CONTROL1 0x00 22 #define AK4104_REG_RESERVED 0x01 23 #define AK4104_REG_CONTROL2 0x02 24 #define AK4104_REG_TX 0x03 25 #define AK4104_REG_CHN_STATUS(x) ((x) + 0x04) 26 #define AK4104_NUM_REGS 10 27 28 #define AK4104_REG_MASK 0x1f 29 #define AK4104_READ 0xc0 30 #define AK4104_WRITE 0xe0 31 #define AK4104_RESERVED_VAL 0x5b 32 33 /* Bit masks for AK4104 registers */ 34 #define AK4104_CONTROL1_RSTN (1 << 0) 35 #define AK4104_CONTROL1_PW (1 << 1) 36 #define AK4104_CONTROL1_DIF0 (1 << 2) 37 #define AK4104_CONTROL1_DIF1 (1 << 3) 38 39 #define AK4104_CONTROL2_SEL0 (1 << 0) 40 #define AK4104_CONTROL2_SEL1 (1 << 1) 41 #define AK4104_CONTROL2_MODE (1 << 2) 42 43 #define AK4104_TX_TXE (1 << 0) 44 #define AK4104_TX_V (1 << 1) 45 46 #define DRV_NAME "ak4104-codec" 47 48 struct ak4104_private { 49 enum snd_soc_control_type control_type; 50 void *control_data; 51 }; 52 53 static int ak4104_fill_cache(struct snd_soc_codec *codec) 54 { 55 int i; 56 u8 *reg_cache = codec->reg_cache; 57 struct spi_device *spi = codec->control_data; 58 59 for (i = 0; i < codec->driver->reg_cache_size; i++) { 60 int ret = spi_w8r8(spi, i | AK4104_READ); 61 if (ret < 0) { 62 dev_err(&spi->dev, "SPI write failure\n"); 63 return ret; 64 } 65 66 reg_cache[i] = ret; 67 } 68 69 return 0; 70 } 71 72 static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec, 73 unsigned int reg) 74 { 75 u8 *reg_cache = codec->reg_cache; 76 77 if (reg >= codec->driver->reg_cache_size) 78 return -EINVAL; 79 80 return reg_cache[reg]; 81 } 82 83 static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg, 84 unsigned int value) 85 { 86 u8 *cache = codec->reg_cache; 87 struct spi_device *spi = codec->control_data; 88 89 if (reg >= codec->driver->reg_cache_size) 90 return -EINVAL; 91 92 /* only write to the hardware if value has changed */ 93 if (cache[reg] != value) { 94 u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value }; 95 96 if (spi_write(spi, tmp, sizeof(tmp))) { 97 dev_err(&spi->dev, "SPI write failed\n"); 98 return -EIO; 99 } 100 101 cache[reg] = value; 102 } 103 104 return 0; 105 } 106 107 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, 108 unsigned int format) 109 { 110 struct snd_soc_codec *codec = codec_dai->codec; 111 int val = 0; 112 113 /* set DAI format */ 114 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 115 case SND_SOC_DAIFMT_RIGHT_J: 116 break; 117 case SND_SOC_DAIFMT_LEFT_J: 118 val |= AK4104_CONTROL1_DIF0; 119 break; 120 case SND_SOC_DAIFMT_I2S: 121 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; 122 break; 123 default: 124 dev_err(codec->dev, "invalid dai format\n"); 125 return -EINVAL; 126 } 127 128 /* This device can only be slave */ 129 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) 130 return -EINVAL; 131 132 ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1, 133 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1, 134 val); 135 if (ret < 0) 136 return ret; 137 138 return 0; 139 } 140 141 static int ak4104_hw_params(struct snd_pcm_substream *substream, 142 struct snd_pcm_hw_params *params, 143 struct snd_soc_dai *dai) 144 { 145 struct snd_soc_pcm_runtime *rtd = substream->private_data; 146 struct snd_soc_codec *codec = rtd->codec; 147 int val = 0; 148 149 /* set the IEC958 bits: consumer mode, no copyright bit */ 150 val |= IEC958_AES0_CON_NOT_COPYRIGHT; 151 snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val); 152 153 val = 0; 154 155 switch (params_rate(params)) { 156 case 44100: 157 val |= IEC958_AES3_CON_FS_44100; 158 break; 159 case 48000: 160 val |= IEC958_AES3_CON_FS_48000; 161 break; 162 case 32000: 163 val |= IEC958_AES3_CON_FS_32000; 164 break; 165 default: 166 dev_err(codec->dev, "unsupported sampling rate\n"); 167 return -EINVAL; 168 } 169 170 return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val); 171 } 172 173 static const struct snd_soc_dai_ops ak4101_dai_ops = { 174 .hw_params = ak4104_hw_params, 175 .set_fmt = ak4104_set_dai_fmt, 176 }; 177 178 static struct snd_soc_dai_driver ak4104_dai = { 179 .name = "ak4104-hifi", 180 .playback = { 181 .stream_name = "Playback", 182 .channels_min = 2, 183 .channels_max = 2, 184 .rates = SNDRV_PCM_RATE_8000_192000, 185 .formats = SNDRV_PCM_FMTBIT_S16_LE | 186 SNDRV_PCM_FMTBIT_S24_3LE | 187 SNDRV_PCM_FMTBIT_S24_LE 188 }, 189 .ops = &ak4101_dai_ops, 190 }; 191 192 static int ak4104_probe(struct snd_soc_codec *codec) 193 { 194 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 195 int ret, val; 196 197 codec->control_data = ak4104->control_data; 198 199 /* read all regs and fill the cache */ 200 ret = ak4104_fill_cache(codec); 201 if (ret < 0) { 202 dev_err(codec->dev, "failed to fill register cache\n"); 203 return ret; 204 } 205 206 /* read the 'reserved' register - according to the datasheet, it 207 * should contain 0x5b. Not a good way to verify the presence of 208 * the device, but there is no hardware ID register. */ 209 if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) != 210 AK4104_RESERVED_VAL) 211 return -ENODEV; 212 213 /* set power-up and non-reset bits */ 214 ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1, 215 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 216 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 217 if (ret < 0) 218 return ret; 219 220 /* enable transmitter */ 221 ret = snd_soc_update_bits(codec, AK4104_REG_TX, 222 AK4104_TX_TXE, AK4104_TX_TXE); 223 if (ret < 0) 224 return ret; 225 226 return 0; 227 } 228 229 static int ak4104_remove(struct snd_soc_codec *codec) 230 { 231 snd_soc_update_bits(codec, AK4104_REG_CONTROL1, 232 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); 233 234 return 0; 235 } 236 237 static struct snd_soc_codec_driver soc_codec_device_ak4104 = { 238 .probe = ak4104_probe, 239 .remove = ak4104_remove, 240 .reg_cache_size = AK4104_NUM_REGS, 241 .reg_word_size = sizeof(u8), 242 }; 243 244 static int ak4104_spi_probe(struct spi_device *spi) 245 { 246 struct ak4104_private *ak4104; 247 int ret; 248 249 spi->bits_per_word = 8; 250 spi->mode = SPI_MODE_0; 251 ret = spi_setup(spi); 252 if (ret < 0) 253 return ret; 254 255 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), 256 GFP_KERNEL); 257 if (ak4104 == NULL) 258 return -ENOMEM; 259 260 ak4104->control_data = spi; 261 ak4104->control_type = SND_SOC_SPI; 262 spi_set_drvdata(spi, ak4104); 263 264 ret = snd_soc_register_codec(&spi->dev, 265 &soc_codec_device_ak4104, &ak4104_dai, 1); 266 return ret; 267 } 268 269 static int __devexit ak4104_spi_remove(struct spi_device *spi) 270 { 271 snd_soc_unregister_codec(&spi->dev); 272 return 0; 273 } 274 275 static struct spi_driver ak4104_spi_driver = { 276 .driver = { 277 .name = DRV_NAME, 278 .owner = THIS_MODULE, 279 }, 280 .probe = ak4104_spi_probe, 281 .remove = __devexit_p(ak4104_spi_remove), 282 }; 283 284 module_spi_driver(ak4104_spi_driver); 285 286 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 287 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 288 MODULE_LICENSE("GPL"); 289 290