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 struct ak4104_private { 49 struct regmap *regmap; 50 }; 51 52 static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = { 53 SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0), 54 55 SND_SOC_DAPM_OUTPUT("TX"), 56 }; 57 58 static const struct snd_soc_dapm_route ak4104_dapm_routes[] = { 59 { "TXE", NULL, "Playback" }, 60 { "TX", NULL, "TXE" }, 61 }; 62 63 static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, 64 unsigned int format) 65 { 66 struct snd_soc_codec *codec = codec_dai->codec; 67 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 68 int val = 0; 69 int ret; 70 71 /* set DAI format */ 72 switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { 73 case SND_SOC_DAIFMT_RIGHT_J: 74 break; 75 case SND_SOC_DAIFMT_LEFT_J: 76 val |= AK4104_CONTROL1_DIF0; 77 break; 78 case SND_SOC_DAIFMT_I2S: 79 val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; 80 break; 81 default: 82 dev_err(codec->dev, "invalid dai format\n"); 83 return -EINVAL; 84 } 85 86 /* This device can only be slave */ 87 if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) 88 return -EINVAL; 89 90 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 91 AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1, 92 val); 93 if (ret < 0) 94 return ret; 95 96 return 0; 97 } 98 99 static int ak4104_hw_params(struct snd_pcm_substream *substream, 100 struct snd_pcm_hw_params *params, 101 struct snd_soc_dai *dai) 102 { 103 struct snd_soc_codec *codec = dai->codec; 104 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 105 int ret, val = 0; 106 107 /* set the IEC958 bits: consumer mode, no copyright bit */ 108 val |= IEC958_AES0_CON_NOT_COPYRIGHT; 109 regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val); 110 111 val = 0; 112 113 switch (params_rate(params)) { 114 case 22050: 115 val |= IEC958_AES3_CON_FS_22050; 116 break; 117 case 24000: 118 val |= IEC958_AES3_CON_FS_24000; 119 break; 120 case 32000: 121 val |= IEC958_AES3_CON_FS_32000; 122 break; 123 case 44100: 124 val |= IEC958_AES3_CON_FS_44100; 125 break; 126 case 48000: 127 val |= IEC958_AES3_CON_FS_48000; 128 break; 129 case 88200: 130 val |= IEC958_AES3_CON_FS_88200; 131 break; 132 case 96000: 133 val |= IEC958_AES3_CON_FS_96000; 134 break; 135 case 176400: 136 val |= IEC958_AES3_CON_FS_176400; 137 break; 138 case 192000: 139 val |= IEC958_AES3_CON_FS_192000; 140 break; 141 default: 142 dev_err(codec->dev, "unsupported sampling rate\n"); 143 return -EINVAL; 144 } 145 146 ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val); 147 if (ret < 0) 148 return ret; 149 150 return 0; 151 } 152 153 static const struct snd_soc_dai_ops ak4101_dai_ops = { 154 .hw_params = ak4104_hw_params, 155 .set_fmt = ak4104_set_dai_fmt, 156 }; 157 158 static struct snd_soc_dai_driver ak4104_dai = { 159 .name = "ak4104-hifi", 160 .playback = { 161 .stream_name = "Playback", 162 .channels_min = 2, 163 .channels_max = 2, 164 .rates = SNDRV_PCM_RATE_8000_192000, 165 .formats = SNDRV_PCM_FMTBIT_S16_LE | 166 SNDRV_PCM_FMTBIT_S24_3LE | 167 SNDRV_PCM_FMTBIT_S24_LE 168 }, 169 .ops = &ak4101_dai_ops, 170 }; 171 172 static int ak4104_probe(struct snd_soc_codec *codec) 173 { 174 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 175 int ret; 176 177 /* set power-up and non-reset bits */ 178 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 179 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 180 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 181 if (ret < 0) 182 return ret; 183 184 /* enable transmitter */ 185 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX, 186 AK4104_TX_TXE, AK4104_TX_TXE); 187 if (ret < 0) 188 return ret; 189 190 return 0; 191 } 192 193 static int ak4104_remove(struct snd_soc_codec *codec) 194 { 195 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 196 197 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 198 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); 199 200 return 0; 201 } 202 203 static struct snd_soc_codec_driver soc_codec_device_ak4104 = { 204 .probe = ak4104_probe, 205 .remove = ak4104_remove, 206 207 .dapm_widgets = ak4104_dapm_widgets, 208 .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets), 209 .dapm_routes = ak4104_dapm_routes, 210 .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes), 211 }; 212 213 static const struct regmap_config ak4104_regmap = { 214 .reg_bits = 8, 215 .val_bits = 8, 216 217 .max_register = AK4104_NUM_REGS - 1, 218 .read_flag_mask = AK4104_READ, 219 .write_flag_mask = AK4104_WRITE, 220 221 .cache_type = REGCACHE_RBTREE, 222 }; 223 224 static int ak4104_spi_probe(struct spi_device *spi) 225 { 226 struct device_node *np = spi->dev.of_node; 227 struct ak4104_private *ak4104; 228 unsigned int val; 229 int ret; 230 231 spi->bits_per_word = 8; 232 spi->mode = SPI_MODE_0; 233 ret = spi_setup(spi); 234 if (ret < 0) 235 return ret; 236 237 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), 238 GFP_KERNEL); 239 if (ak4104 == NULL) 240 return -ENOMEM; 241 242 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap); 243 if (IS_ERR(ak4104->regmap)) { 244 ret = PTR_ERR(ak4104->regmap); 245 return ret; 246 } 247 248 if (np) { 249 enum of_gpio_flags flags; 250 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags); 251 252 if (gpio_is_valid(gpio)) { 253 ret = devm_gpio_request_one(&spi->dev, gpio, 254 flags & OF_GPIO_ACTIVE_LOW ? 255 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, 256 "ak4104 reset"); 257 if (ret < 0) 258 return ret; 259 } 260 } 261 262 /* read the 'reserved' register - according to the datasheet, it 263 * should contain 0x5b. Not a good way to verify the presence of 264 * the device, but there is no hardware ID register. */ 265 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val); 266 if (ret != 0) 267 return ret; 268 if (val != AK4104_RESERVED_VAL) 269 return -ENODEV; 270 271 spi_set_drvdata(spi, ak4104); 272 273 ret = snd_soc_register_codec(&spi->dev, 274 &soc_codec_device_ak4104, &ak4104_dai, 1); 275 return ret; 276 } 277 278 static int ak4104_spi_remove(struct spi_device *spi) 279 { 280 snd_soc_unregister_codec(&spi->dev); 281 return 0; 282 } 283 284 static const struct of_device_id ak4104_of_match[] = { 285 { .compatible = "asahi-kasei,ak4104", }, 286 { } 287 }; 288 MODULE_DEVICE_TABLE(of, ak4104_of_match); 289 290 static const struct spi_device_id ak4104_id_table[] = { 291 { "ak4104", 0 }, 292 { } 293 }; 294 MODULE_DEVICE_TABLE(spi, ak4104_id_table); 295 296 static struct spi_driver ak4104_spi_driver = { 297 .driver = { 298 .name = "ak4104", 299 .owner = THIS_MODULE, 300 .of_match_table = ak4104_of_match, 301 }, 302 .id_table = ak4104_id_table, 303 .probe = ak4104_spi_probe, 304 .remove = ak4104_spi_remove, 305 }; 306 307 module_spi_driver(ak4104_spi_driver); 308 309 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 310 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 311 MODULE_LICENSE("GPL"); 312 313