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 ret, 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 ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val); 138 if (ret < 0) 139 return ret; 140 141 /* enable transmitter */ 142 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX, 143 AK4104_TX_TXE, AK4104_TX_TXE); 144 if (ret < 0) 145 return ret; 146 147 return 0; 148 } 149 150 static int ak4104_hw_free(struct snd_pcm_substream *substream, 151 struct snd_soc_dai *dai) 152 { 153 struct snd_soc_codec *codec = dai->codec; 154 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 155 156 /* disable transmitter */ 157 return regmap_update_bits(ak4104->regmap, AK4104_REG_TX, 158 AK4104_TX_TXE, 0); 159 } 160 161 static const struct snd_soc_dai_ops ak4101_dai_ops = { 162 .hw_params = ak4104_hw_params, 163 .hw_free = ak4104_hw_free, 164 .set_fmt = ak4104_set_dai_fmt, 165 }; 166 167 static struct snd_soc_dai_driver ak4104_dai = { 168 .name = "ak4104-hifi", 169 .playback = { 170 .stream_name = "Playback", 171 .channels_min = 2, 172 .channels_max = 2, 173 .rates = SNDRV_PCM_RATE_8000_192000, 174 .formats = SNDRV_PCM_FMTBIT_S16_LE | 175 SNDRV_PCM_FMTBIT_S24_3LE | 176 SNDRV_PCM_FMTBIT_S24_LE 177 }, 178 .ops = &ak4101_dai_ops, 179 }; 180 181 static int ak4104_probe(struct snd_soc_codec *codec) 182 { 183 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 184 int ret; 185 186 codec->control_data = ak4104->regmap; 187 188 /* set power-up and non-reset bits */ 189 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 190 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 191 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 192 if (ret < 0) 193 return ret; 194 195 /* enable transmitter */ 196 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX, 197 AK4104_TX_TXE, AK4104_TX_TXE); 198 if (ret < 0) 199 return ret; 200 201 return 0; 202 } 203 204 static int ak4104_remove(struct snd_soc_codec *codec) 205 { 206 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 207 208 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 209 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); 210 211 return 0; 212 } 213 214 static struct snd_soc_codec_driver soc_codec_device_ak4104 = { 215 .probe = ak4104_probe, 216 .remove = ak4104_remove, 217 }; 218 219 static const struct regmap_config ak4104_regmap = { 220 .reg_bits = 8, 221 .val_bits = 8, 222 223 .max_register = AK4104_NUM_REGS - 1, 224 .read_flag_mask = AK4104_READ, 225 .write_flag_mask = AK4104_WRITE, 226 227 .cache_type = REGCACHE_RBTREE, 228 }; 229 230 static int ak4104_spi_probe(struct spi_device *spi) 231 { 232 struct device_node *np = spi->dev.of_node; 233 struct ak4104_private *ak4104; 234 unsigned int val; 235 int ret; 236 237 spi->bits_per_word = 8; 238 spi->mode = SPI_MODE_0; 239 ret = spi_setup(spi); 240 if (ret < 0) 241 return ret; 242 243 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), 244 GFP_KERNEL); 245 if (ak4104 == NULL) 246 return -ENOMEM; 247 248 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap); 249 if (IS_ERR(ak4104->regmap)) { 250 ret = PTR_ERR(ak4104->regmap); 251 return ret; 252 } 253 254 if (np) { 255 enum of_gpio_flags flags; 256 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags); 257 258 if (gpio_is_valid(gpio)) { 259 ret = devm_gpio_request_one(&spi->dev, gpio, 260 flags & OF_GPIO_ACTIVE_LOW ? 261 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, 262 "ak4104 reset"); 263 if (ret < 0) 264 return ret; 265 } 266 } 267 268 /* read the 'reserved' register - according to the datasheet, it 269 * should contain 0x5b. Not a good way to verify the presence of 270 * the device, but there is no hardware ID register. */ 271 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val); 272 if (ret != 0) 273 return ret; 274 if (val != AK4104_RESERVED_VAL) 275 return -ENODEV; 276 277 spi_set_drvdata(spi, ak4104); 278 279 ret = snd_soc_register_codec(&spi->dev, 280 &soc_codec_device_ak4104, &ak4104_dai, 1); 281 return ret; 282 } 283 284 static int ak4104_spi_remove(struct spi_device *spi) 285 { 286 snd_soc_unregister_codec(&spi->dev); 287 return 0; 288 } 289 290 static const struct of_device_id ak4104_of_match[] = { 291 { .compatible = "asahi-kasei,ak4104", }, 292 { } 293 }; 294 MODULE_DEVICE_TABLE(of, ak4104_of_match); 295 296 static struct spi_driver ak4104_spi_driver = { 297 .driver = { 298 .name = DRV_NAME, 299 .owner = THIS_MODULE, 300 .of_match_table = ak4104_of_match, 301 }, 302 .probe = ak4104_spi_probe, 303 .remove = ak4104_spi_remove, 304 }; 305 306 module_spi_driver(ak4104_spi_driver); 307 308 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 309 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 310 MODULE_LICENSE("GPL"); 311 312