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/gpio/consumer.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_component *component = codec_dai->component; 69 struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component); 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(component->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_component *component = dai->component; 106 struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component); 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(component->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_component *component) 178 { 179 struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component); 180 int ret; 181 182 ret = regulator_enable(ak4104->regulator); 183 if (ret < 0) { 184 dev_err(component->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 void ak4104_remove(struct snd_soc_component *component) 209 { 210 struct ak4104_private *ak4104 = snd_soc_component_get_drvdata(component); 211 212 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 213 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); 214 regulator_disable(ak4104->regulator); 215 } 216 217 #ifdef CONFIG_PM 218 static int ak4104_soc_suspend(struct snd_soc_component *component) 219 { 220 struct ak4104_private *priv = snd_soc_component_get_drvdata(component); 221 222 regulator_disable(priv->regulator); 223 224 return 0; 225 } 226 227 static int ak4104_soc_resume(struct snd_soc_component *component) 228 { 229 struct ak4104_private *priv = snd_soc_component_get_drvdata(component); 230 int ret; 231 232 ret = regulator_enable(priv->regulator); 233 if (ret < 0) 234 return ret; 235 236 return 0; 237 } 238 #else 239 #define ak4104_soc_suspend NULL 240 #define ak4104_soc_resume NULL 241 #endif /* CONFIG_PM */ 242 243 static const struct snd_soc_component_driver soc_component_device_ak4104 = { 244 .probe = ak4104_probe, 245 .remove = ak4104_remove, 246 .suspend = ak4104_soc_suspend, 247 .resume = ak4104_soc_resume, 248 .dapm_widgets = ak4104_dapm_widgets, 249 .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets), 250 .dapm_routes = ak4104_dapm_routes, 251 .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes), 252 .idle_bias_on = 1, 253 .use_pmdown_time = 1, 254 .endianness = 1, 255 .non_legacy_dai_naming = 1, 256 }; 257 258 static const struct regmap_config ak4104_regmap = { 259 .reg_bits = 8, 260 .val_bits = 8, 261 262 .max_register = AK4104_NUM_REGS - 1, 263 .read_flag_mask = AK4104_READ, 264 .write_flag_mask = AK4104_WRITE, 265 266 .cache_type = REGCACHE_RBTREE, 267 }; 268 269 static int ak4104_spi_probe(struct spi_device *spi) 270 { 271 struct ak4104_private *ak4104; 272 struct gpio_desc *reset_gpiod; 273 unsigned int val; 274 int ret; 275 276 spi->bits_per_word = 8; 277 spi->mode = SPI_MODE_0; 278 ret = spi_setup(spi); 279 if (ret < 0) 280 return ret; 281 282 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), 283 GFP_KERNEL); 284 if (ak4104 == NULL) 285 return -ENOMEM; 286 287 ak4104->regulator = devm_regulator_get(&spi->dev, "vdd"); 288 if (IS_ERR(ak4104->regulator)) { 289 ret = PTR_ERR(ak4104->regulator); 290 dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret); 291 return ret; 292 } 293 294 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap); 295 if (IS_ERR(ak4104->regmap)) { 296 ret = PTR_ERR(ak4104->regmap); 297 return ret; 298 } 299 300 reset_gpiod = devm_gpiod_get_optional(&spi->dev, "reset", 301 GPIOD_OUT_HIGH); 302 if (IS_ERR(reset_gpiod) && 303 PTR_ERR(reset_gpiod) == -EPROBE_DEFER) 304 return -EPROBE_DEFER; 305 306 /* read the 'reserved' register - according to the datasheet, it 307 * should contain 0x5b. Not a good way to verify the presence of 308 * the device, but there is no hardware ID register. */ 309 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val); 310 if (ret != 0) 311 return ret; 312 if (val != AK4104_RESERVED_VAL) 313 return -ENODEV; 314 315 spi_set_drvdata(spi, ak4104); 316 317 ret = devm_snd_soc_register_component(&spi->dev, 318 &soc_component_device_ak4104, &ak4104_dai, 1); 319 return ret; 320 } 321 322 static const struct of_device_id ak4104_of_match[] = { 323 { .compatible = "asahi-kasei,ak4104", }, 324 { } 325 }; 326 MODULE_DEVICE_TABLE(of, ak4104_of_match); 327 328 static const struct spi_device_id ak4104_id_table[] = { 329 { "ak4104", 0 }, 330 { } 331 }; 332 MODULE_DEVICE_TABLE(spi, ak4104_id_table); 333 334 static struct spi_driver ak4104_spi_driver = { 335 .driver = { 336 .name = "ak4104", 337 .of_match_table = ak4104_of_match, 338 }, 339 .id_table = ak4104_id_table, 340 .probe = ak4104_spi_probe, 341 }; 342 343 module_spi_driver(ak4104_spi_driver); 344 345 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 346 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 347 MODULE_LICENSE("GPL"); 348 349