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 <linux/of_device.h> 19 #include <linux/of_gpio.h> 20 #include <sound/asoundef.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-codec" 49 50 struct ak4104_private { 51 struct regmap *regmap; 52 }; 53 54 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, 55 unsigned int format) 56 { 57 struct snd_soc_codec *codec = codec_dai->codec; 58 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 59 int val = 0; 60 int ret; 61 62 /* set DAI format */ 63 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 64 case SND_SOC_DAIFMT_RIGHT_J: 65 break; 66 case SND_SOC_DAIFMT_LEFT_J: 67 val |= AK4104_CONTROL1_DIF0; 68 break; 69 case SND_SOC_DAIFMT_I2S: 70 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; 71 break; 72 default: 73 dev_err(codec->dev, "invalid dai format\n"); 74 return -EINVAL; 75 } 76 77 /* This device can only be slave */ 78 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) 79 return -EINVAL; 80 81 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 82 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1, 83 val); 84 if (ret < 0) 85 return ret; 86 87 return 0; 88 } 89 90 static int ak4104_hw_params(struct snd_pcm_substream *substream, 91 struct snd_pcm_hw_params *params, 92 struct snd_soc_dai *dai) 93 { 94 struct snd_soc_codec *codec = dai->codec; 95 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 96 int val = 0; 97 98 /* set the IEC958 bits: consumer mode, no copyright bit */ 99 val |= IEC958_AES0_CON_NOT_COPYRIGHT; 100 regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val); 101 102 val = 0; 103 104 switch (params_rate(params)) { 105 case 22050: 106 val |= IEC958_AES3_CON_FS_22050; 107 break; 108 case 24000: 109 val |= IEC958_AES3_CON_FS_24000; 110 break; 111 case 32000: 112 val |= IEC958_AES3_CON_FS_32000; 113 break; 114 case 44100: 115 val |= IEC958_AES3_CON_FS_44100; 116 break; 117 case 48000: 118 val |= IEC958_AES3_CON_FS_48000; 119 break; 120 case 88200: 121 val |= IEC958_AES3_CON_FS_88200; 122 break; 123 case 96000: 124 val |= IEC958_AES3_CON_FS_96000; 125 break; 126 case 176400: 127 val |= IEC958_AES3_CON_FS_176400; 128 break; 129 case 192000: 130 val |= IEC958_AES3_CON_FS_192000; 131 break; 132 default: 133 dev_err(codec->dev, "unsupported sampling rate\n"); 134 return -EINVAL; 135 } 136 137 return regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val); 138 } 139 140 static const struct snd_soc_dai_ops ak4101_dai_ops = { 141 .hw_params = ak4104_hw_params, 142 .set_fmt = ak4104_set_dai_fmt, 143 }; 144 145 static struct snd_soc_dai_driver ak4104_dai = { 146 .name = "ak4104-hifi", 147 .playback = { 148 .stream_name = "Playback", 149 .channels_min = 2, 150 .channels_max = 2, 151 .rates = SNDRV_PCM_RATE_8000_192000, 152 .formats = SNDRV_PCM_FMTBIT_S16_LE | 153 SNDRV_PCM_FMTBIT_S24_3LE | 154 SNDRV_PCM_FMTBIT_S24_LE 155 }, 156 .ops = &ak4101_dai_ops, 157 }; 158 159 static int ak4104_probe(struct snd_soc_codec *codec) 160 { 161 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 162 int ret; 163 164 codec->control_data = ak4104->regmap; 165 166 /* set power-up and non-reset bits */ 167 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 168 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 169 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 170 if (ret < 0) 171 return ret; 172 173 /* enable transmitter */ 174 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX, 175 AK4104_TX_TXE, AK4104_TX_TXE); 176 if (ret < 0) 177 return ret; 178 179 return 0; 180 } 181 182 static int ak4104_remove(struct snd_soc_codec *codec) 183 { 184 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 185 186 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 187 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); 188 189 return 0; 190 } 191 192 static struct snd_soc_codec_driver soc_codec_device_ak4104 = { 193 .probe = ak4104_probe, 194 .remove = ak4104_remove, 195 }; 196 197 static const struct regmap_config ak4104_regmap = { 198 .reg_bits = 8, 199 .val_bits = 8, 200 201 .max_register = AK4104_NUM_REGS - 1, 202 .read_flag_mask = AK4104_READ, 203 .write_flag_mask = AK4104_WRITE, 204 205 .cache_type = REGCACHE_RBTREE, 206 }; 207 208 static int ak4104_spi_probe(struct spi_device *spi) 209 { 210 struct device_node *np = spi->dev.of_node; 211 struct ak4104_private *ak4104; 212 unsigned int val; 213 int ret; 214 215 spi->bits_per_word = 8; 216 spi->mode = SPI_MODE_0; 217 ret = spi_setup(spi); 218 if (ret < 0) 219 return ret; 220 221 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), 222 GFP_KERNEL); 223 if (ak4104 == NULL) 224 return -ENOMEM; 225 226 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap); 227 if (IS_ERR(ak4104->regmap)) { 228 ret = PTR_ERR(ak4104->regmap); 229 return ret; 230 } 231 232 if (np) { 233 enum of_gpio_flags flags; 234 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags); 235 236 if (gpio_is_valid(gpio)) { 237 ret = devm_gpio_request_one(&spi->dev, gpio, 238 flags & OF_GPIO_ACTIVE_LOW ? 239 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, 240 "ak4104 reset"); 241 if (ret < 0) 242 return ret; 243 } 244 } 245 246 /* read the 'reserved' register - according to the datasheet, it 247 * should contain 0x5b. Not a good way to verify the presence of 248 * the device, but there is no hardware ID register. */ 249 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val); 250 if (ret != 0) 251 return ret; 252 if (val != AK4104_RESERVED_VAL) 253 return -ENODEV; 254 255 spi_set_drvdata(spi, ak4104); 256 257 ret = snd_soc_register_codec(&spi->dev, 258 &soc_codec_device_ak4104, &ak4104_dai, 1); 259 return ret; 260 } 261 262 static int ak4104_spi_remove(struct spi_device *spi) 263 { 264 snd_soc_unregister_codec(&spi->dev); 265 return 0; 266 } 267 268 static const struct of_device_id ak4104_of_match[] = { 269 { .compatible = "asahi-kasei,ak4104", }, 270 { } 271 }; 272 MODULE_DEVICE_TABLE(of, ak4104_of_match); 273 274 static struct spi_driver ak4104_spi_driver = { 275 .driver = { 276 .name = DRV_NAME, 277 .owner = THIS_MODULE, 278 .of_match_table = ak4104_of_match, 279 }, 280 .probe = ak4104_spi_probe, 281 .remove = 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