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 <linux/spi/spi.h> 15 #include <linux/of_device.h> 16 #include <linux/of_gpio.h> 17 #include <linux/regulator/consumer.h> 18 #include <sound/asoundef.h> 19 #include <sound/core.h> 20 #include <sound/soc.h> 21 #include <sound/initval.h> 22 23 /* AK4104 registers addresses */ 24 #define AK4104_REG_CONTROL1 0x00 25 #define AK4104_REG_RESERVED 0x01 26 #define AK4104_REG_CONTROL2 0x02 27 #define AK4104_REG_TX 0x03 28 #define AK4104_REG_CHN_STATUS(x) ((x) + 0x04) 29 #define AK4104_NUM_REGS 10 30 31 #define AK4104_REG_MASK 0x1f 32 #define AK4104_READ 0xc0 33 #define AK4104_WRITE 0xe0 34 #define AK4104_RESERVED_VAL 0x5b 35 36 /* Bit masks for AK4104 registers */ 37 #define AK4104_CONTROL1_RSTN (1 << 0) 38 #define AK4104_CONTROL1_PW (1 << 1) 39 #define AK4104_CONTROL1_DIF0 (1 << 2) 40 #define AK4104_CONTROL1_DIF1 (1 << 3) 41 42 #define AK4104_CONTROL2_SEL0 (1 << 0) 43 #define AK4104_CONTROL2_SEL1 (1 << 1) 44 #define AK4104_CONTROL2_MODE (1 << 2) 45 46 #define AK4104_TX_TXE (1 << 0) 47 #define AK4104_TX_V (1 << 1) 48 49 struct ak4104_private { 50 struct regmap *regmap; 51 struct regulator *regulator; 52 }; 53 54 static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = { 55 SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0), 56 57 SND_SOC_DAPM_OUTPUT("TX"), 58 }; 59 60 static const struct snd_soc_dapm_route ak4104_dapm_routes[] = { 61 { "TXE", NULL, "Playback" }, 62 { "TX", NULL, "TXE" }, 63 }; 64 65 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, 66 unsigned int format) 67 { 68 struct snd_soc_codec *codec = codec_dai->codec; 69 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 70 int val = 0; 71 int ret; 72 73 /* set DAI format */ 74 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 75 case SND_SOC_DAIFMT_RIGHT_J: 76 break; 77 case SND_SOC_DAIFMT_LEFT_J: 78 val |= AK4104_CONTROL1_DIF0; 79 break; 80 case SND_SOC_DAIFMT_I2S: 81 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; 82 break; 83 default: 84 dev_err(codec->dev, "invalid dai format\n"); 85 return -EINVAL; 86 } 87 88 /* This device can only be slave */ 89 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) 90 return -EINVAL; 91 92 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 93 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1, 94 val); 95 if (ret < 0) 96 return ret; 97 98 return 0; 99 } 100 101 static int ak4104_hw_params(struct snd_pcm_substream *substream, 102 struct snd_pcm_hw_params *params, 103 struct snd_soc_dai *dai) 104 { 105 struct snd_soc_codec *codec = dai->codec; 106 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 107 int ret, val = 0; 108 109 /* set the IEC958 bits: consumer mode, no copyright bit */ 110 val |= IEC958_AES0_CON_NOT_COPYRIGHT; 111 regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val); 112 113 val = 0; 114 115 switch (params_rate(params)) { 116 case 22050: 117 val |= IEC958_AES3_CON_FS_22050; 118 break; 119 case 24000: 120 val |= IEC958_AES3_CON_FS_24000; 121 break; 122 case 32000: 123 val |= IEC958_AES3_CON_FS_32000; 124 break; 125 case 44100: 126 val |= IEC958_AES3_CON_FS_44100; 127 break; 128 case 48000: 129 val |= IEC958_AES3_CON_FS_48000; 130 break; 131 case 88200: 132 val |= IEC958_AES3_CON_FS_88200; 133 break; 134 case 96000: 135 val |= IEC958_AES3_CON_FS_96000; 136 break; 137 case 176400: 138 val |= IEC958_AES3_CON_FS_176400; 139 break; 140 case 192000: 141 val |= IEC958_AES3_CON_FS_192000; 142 break; 143 default: 144 dev_err(codec->dev, "unsupported sampling rate\n"); 145 return -EINVAL; 146 } 147 148 ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val); 149 if (ret < 0) 150 return ret; 151 152 return 0; 153 } 154 155 static const struct snd_soc_dai_ops ak4101_dai_ops = { 156 .hw_params = ak4104_hw_params, 157 .set_fmt = ak4104_set_dai_fmt, 158 }; 159 160 static struct snd_soc_dai_driver ak4104_dai = { 161 .name = "ak4104-hifi", 162 .playback = { 163 .stream_name = "Playback", 164 .channels_min = 2, 165 .channels_max = 2, 166 .rates = SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | 167 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | 168 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | 169 SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000, 170 .formats = SNDRV_PCM_FMTBIT_S16_LE | 171 SNDRV_PCM_FMTBIT_S24_3LE | 172 SNDRV_PCM_FMTBIT_S24_LE 173 }, 174 .ops = &ak4101_dai_ops, 175 }; 176 177 static int ak4104_probe(struct snd_soc_codec *codec) 178 { 179 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 180 int ret; 181 182 ret = regulator_enable(ak4104->regulator); 183 if (ret < 0) { 184 dev_err(codec->dev, "Unable to enable regulator: %d\n", ret); 185 return ret; 186 } 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 goto exit_disable_regulator; 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 goto exit_disable_regulator; 200 201 return 0; 202 203 exit_disable_regulator: 204 regulator_disable(ak4104->regulator); 205 return ret; 206 } 207 208 static int ak4104_remove(struct snd_soc_codec *codec) 209 { 210 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 211 212 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 213 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); 214 regulator_disable(ak4104->regulator); 215 216 return 0; 217 } 218 219 #ifdef CONFIG_PM 220 static int ak4104_soc_suspend(struct snd_soc_codec *codec) 221 { 222 struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec); 223 224 regulator_disable(priv->regulator); 225 226 return 0; 227 } 228 229 static int ak4104_soc_resume(struct snd_soc_codec *codec) 230 { 231 struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec); 232 int ret; 233 234 ret = regulator_enable(priv->regulator); 235 if (ret < 0) 236 return ret; 237 238 return 0; 239 } 240 #else 241 #define ak4104_soc_suspend NULL 242 #define ak4104_soc_resume NULL 243 #endif /* CONFIG_PM */ 244 245 static const struct snd_soc_codec_driver soc_codec_device_ak4104 = { 246 .probe = ak4104_probe, 247 .remove = ak4104_remove, 248 .suspend = ak4104_soc_suspend, 249 .resume = ak4104_soc_resume, 250 251 .component_driver = { 252 .dapm_widgets = ak4104_dapm_widgets, 253 .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets), 254 .dapm_routes = ak4104_dapm_routes, 255 .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes), 256 } 257 }; 258 259 static const struct regmap_config ak4104_regmap = { 260 .reg_bits = 8, 261 .val_bits = 8, 262 263 .max_register = AK4104_NUM_REGS - 1, 264 .read_flag_mask = AK4104_READ, 265 .write_flag_mask = AK4104_WRITE, 266 267 .cache_type = REGCACHE_RBTREE, 268 }; 269 270 static int ak4104_spi_probe(struct spi_device *spi) 271 { 272 struct device_node *np = spi->dev.of_node; 273 struct ak4104_private *ak4104; 274 unsigned int val; 275 int ret; 276 277 spi->bits_per_word = 8; 278 spi->mode = SPI_MODE_0; 279 ret = spi_setup(spi); 280 if (ret < 0) 281 return ret; 282 283 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), 284 GFP_KERNEL); 285 if (ak4104 == NULL) 286 return -ENOMEM; 287 288 ak4104->regulator = devm_regulator_get(&spi->dev, "vdd"); 289 if (IS_ERR(ak4104->regulator)) { 290 ret = PTR_ERR(ak4104->regulator); 291 dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret); 292 return ret; 293 } 294 295 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap); 296 if (IS_ERR(ak4104->regmap)) { 297 ret = PTR_ERR(ak4104->regmap); 298 return ret; 299 } 300 301 if (np) { 302 enum of_gpio_flags flags; 303 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags); 304 305 if (gpio_is_valid(gpio)) { 306 ret = devm_gpio_request_one(&spi->dev, gpio, 307 flags & OF_GPIO_ACTIVE_LOW ? 308 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, 309 "ak4104 reset"); 310 if (ret < 0) 311 return ret; 312 } 313 } 314 315 /* read the 'reserved' register - according to the datasheet, it 316 * should contain 0x5b. Not a good way to verify the presence of 317 * the device, but there is no hardware ID register. */ 318 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val); 319 if (ret != 0) 320 return ret; 321 if (val != AK4104_RESERVED_VAL) 322 return -ENODEV; 323 324 spi_set_drvdata(spi, ak4104); 325 326 ret = snd_soc_register_codec(&spi->dev, 327 &soc_codec_device_ak4104, &ak4104_dai, 1); 328 return ret; 329 } 330 331 static int ak4104_spi_remove(struct spi_device *spi) 332 { 333 snd_soc_unregister_codec(&spi->dev); 334 return 0; 335 } 336 337 static const struct of_device_id ak4104_of_match[] = { 338 { .compatible = "asahi-kasei,ak4104", }, 339 { } 340 }; 341 MODULE_DEVICE_TABLE(of, ak4104_of_match); 342 343 static const struct spi_device_id ak4104_id_table[] = { 344 { "ak4104", 0 }, 345 { } 346 }; 347 MODULE_DEVICE_TABLE(spi, ak4104_id_table); 348 349 static struct spi_driver ak4104_spi_driver = { 350 .driver = { 351 .name = "ak4104", 352 .of_match_table = ak4104_of_match, 353 }, 354 .id_table = ak4104_id_table, 355 .probe = ak4104_spi_probe, 356 .remove = ak4104_spi_remove, 357 }; 358 359 module_spi_driver(ak4104_spi_driver); 360 361 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 362 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 363 MODULE_LICENSE("GPL"); 364 365