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 struct regmap *regmap; 50 }; 51 52 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, 53 unsigned int format) 54 { 55 struct snd_soc_codec *codec = codec_dai->codec; 56 int val = 0; 57 int ret; 58 59 /* set DAI format */ 60 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 61 case SND_SOC_DAIFMT_RIGHT_J: 62 break; 63 case SND_SOC_DAIFMT_LEFT_J: 64 val |= AK4104_CONTROL1_DIF0; 65 break; 66 case SND_SOC_DAIFMT_I2S: 67 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; 68 break; 69 default: 70 dev_err(codec->dev, "invalid dai format\n"); 71 return -EINVAL; 72 } 73 74 /* This device can only be slave */ 75 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) 76 return -EINVAL; 77 78 ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1, 79 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1, 80 val); 81 if (ret < 0) 82 return ret; 83 84 return 0; 85 } 86 87 static int ak4104_hw_params(struct snd_pcm_substream *substream, 88 struct snd_pcm_hw_params *params, 89 struct snd_soc_dai *dai) 90 { 91 struct snd_soc_codec *codec = dai->codec; 92 int val = 0; 93 94 /* set the IEC958 bits: consumer mode, no copyright bit */ 95 val |= IEC958_AES0_CON_NOT_COPYRIGHT; 96 snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val); 97 98 val = 0; 99 100 switch (params_rate(params)) { 101 case 44100: 102 val |= IEC958_AES3_CON_FS_44100; 103 break; 104 case 48000: 105 val |= IEC958_AES3_CON_FS_48000; 106 break; 107 case 32000: 108 val |= IEC958_AES3_CON_FS_32000; 109 break; 110 default: 111 dev_err(codec->dev, "unsupported sampling rate\n"); 112 return -EINVAL; 113 } 114 115 return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val); 116 } 117 118 static const struct snd_soc_dai_ops ak4101_dai_ops = { 119 .hw_params = ak4104_hw_params, 120 .set_fmt = ak4104_set_dai_fmt, 121 }; 122 123 static struct snd_soc_dai_driver ak4104_dai = { 124 .name = "ak4104-hifi", 125 .playback = { 126 .stream_name = "Playback", 127 .channels_min = 2, 128 .channels_max = 2, 129 .rates = SNDRV_PCM_RATE_8000_192000, 130 .formats = SNDRV_PCM_FMTBIT_S16_LE | 131 SNDRV_PCM_FMTBIT_S24_3LE | 132 SNDRV_PCM_FMTBIT_S24_LE 133 }, 134 .ops = &ak4101_dai_ops, 135 }; 136 137 static int ak4104_probe(struct snd_soc_codec *codec) 138 { 139 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 140 int ret; 141 142 codec->control_data = ak4104->regmap; 143 ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP); 144 if (ret != 0) 145 return ret; 146 147 /* set power-up and non-reset bits */ 148 ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1, 149 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 150 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 151 if (ret < 0) 152 return ret; 153 154 /* enable transmitter */ 155 ret = snd_soc_update_bits(codec, AK4104_REG_TX, 156 AK4104_TX_TXE, AK4104_TX_TXE); 157 if (ret < 0) 158 return ret; 159 160 return 0; 161 } 162 163 static int ak4104_remove(struct snd_soc_codec *codec) 164 { 165 snd_soc_update_bits(codec, AK4104_REG_CONTROL1, 166 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); 167 168 return 0; 169 } 170 171 static struct snd_soc_codec_driver soc_codec_device_ak4104 = { 172 .probe = ak4104_probe, 173 .remove = ak4104_remove, 174 }; 175 176 static const struct regmap_config ak4104_regmap = { 177 .reg_bits = 8, 178 .val_bits = 8, 179 180 .max_register = AK4104_NUM_REGS - 1, 181 .read_flag_mask = AK4104_READ, 182 .write_flag_mask = AK4104_WRITE, 183 184 .cache_type = REGCACHE_RBTREE, 185 }; 186 187 static int ak4104_spi_probe(struct spi_device *spi) 188 { 189 struct ak4104_private *ak4104; 190 unsigned int val; 191 int ret; 192 193 spi->bits_per_word = 8; 194 spi->mode = SPI_MODE_0; 195 ret = spi_setup(spi); 196 if (ret < 0) 197 return ret; 198 199 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), 200 GFP_KERNEL); 201 if (ak4104 == NULL) 202 return -ENOMEM; 203 204 ak4104->regmap = regmap_init_spi(spi, &ak4104_regmap); 205 if (IS_ERR(ak4104->regmap)) { 206 ret = PTR_ERR(ak4104->regmap); 207 return ret; 208 } 209 210 /* read the 'reserved' register - according to the datasheet, it 211 * should contain 0x5b. Not a good way to verify the presence of 212 * the device, but there is no hardware ID register. */ 213 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val); 214 if (ret != 0) 215 goto err; 216 if (val != AK4104_RESERVED_VAL) { 217 ret = -ENODEV; 218 goto err; 219 } 220 221 spi_set_drvdata(spi, ak4104); 222 223 ret = snd_soc_register_codec(&spi->dev, 224 &soc_codec_device_ak4104, &ak4104_dai, 1); 225 if (ret != 0) 226 goto err; 227 228 return 0; 229 230 err: 231 regmap_exit(ak4104->regmap); 232 return ret; 233 } 234 235 static int __devexit ak4104_spi_remove(struct spi_device *spi) 236 { 237 struct ak4104_private *ak4101 = spi_get_drvdata(spi); 238 regmap_exit(ak4101->regmap); 239 snd_soc_unregister_codec(&spi->dev); 240 return 0; 241 } 242 243 static struct spi_driver ak4104_spi_driver = { 244 .driver = { 245 .name = DRV_NAME, 246 .owner = THIS_MODULE, 247 }, 248 .probe = ak4104_spi_probe, 249 .remove = __devexit_p(ak4104_spi_remove), 250 }; 251 252 module_spi_driver(ak4104_spi_driver); 253 254 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 255 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 256 MODULE_LICENSE("GPL"); 257 258