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 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_8000_192000, 167 .formats = SNDRV_PCM_FMTBIT_S16_LE | 168 SNDRV_PCM_FMTBIT_S24_3LE | 169 SNDRV_PCM_FMTBIT_S24_LE 170 }, 171 .ops = &ak4101_dai_ops, 172 }; 173 174 static int ak4104_probe(struct snd_soc_codec *codec) 175 { 176 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 177 int ret; 178 179 codec->control_data = ak4104->regmap; 180 181 /* set power-up and non-reset bits */ 182 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 183 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 184 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); 185 if (ret < 0) 186 return ret; 187 188 /* enable transmitter */ 189 ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX, 190 AK4104_TX_TXE, AK4104_TX_TXE); 191 if (ret < 0) 192 return ret; 193 194 return 0; 195 } 196 197 static int ak4104_remove(struct snd_soc_codec *codec) 198 { 199 struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); 200 201 regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, 202 AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); 203 204 return 0; 205 } 206 207 static struct snd_soc_codec_driver soc_codec_device_ak4104 = { 208 .probe = ak4104_probe, 209 .remove = ak4104_remove, 210 211 .dapm_widgets = ak4104_dapm_widgets, 212 .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets), 213 .dapm_routes = ak4104_dapm_routes, 214 .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes), 215 }; 216 217 static const struct regmap_config ak4104_regmap = { 218 .reg_bits = 8, 219 .val_bits = 8, 220 221 .max_register = AK4104_NUM_REGS - 1, 222 .read_flag_mask = AK4104_READ, 223 .write_flag_mask = AK4104_WRITE, 224 225 .cache_type = REGCACHE_RBTREE, 226 }; 227 228 static int ak4104_spi_probe(struct spi_device *spi) 229 { 230 struct device_node *np = spi->dev.of_node; 231 struct ak4104_private *ak4104; 232 unsigned int val; 233 int ret; 234 235 spi->bits_per_word = 8; 236 spi->mode = SPI_MODE_0; 237 ret = spi_setup(spi); 238 if (ret < 0) 239 return ret; 240 241 ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), 242 GFP_KERNEL); 243 if (ak4104 == NULL) 244 return -ENOMEM; 245 246 ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap); 247 if (IS_ERR(ak4104->regmap)) { 248 ret = PTR_ERR(ak4104->regmap); 249 return ret; 250 } 251 252 if (np) { 253 enum of_gpio_flags flags; 254 int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags); 255 256 if (gpio_is_valid(gpio)) { 257 ret = devm_gpio_request_one(&spi->dev, gpio, 258 flags & OF_GPIO_ACTIVE_LOW ? 259 GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, 260 "ak4104 reset"); 261 if (ret < 0) 262 return ret; 263 } 264 } 265 266 /* read the 'reserved' register - according to the datasheet, it 267 * should contain 0x5b. Not a good way to verify the presence of 268 * the device, but there is no hardware ID register. */ 269 ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val); 270 if (ret != 0) 271 return ret; 272 if (val != AK4104_RESERVED_VAL) 273 return -ENODEV; 274 275 spi_set_drvdata(spi, ak4104); 276 277 ret = snd_soc_register_codec(&spi->dev, 278 &soc_codec_device_ak4104, &ak4104_dai, 1); 279 return ret; 280 } 281 282 static int ak4104_spi_remove(struct spi_device *spi) 283 { 284 snd_soc_unregister_codec(&spi->dev); 285 return 0; 286 } 287 288 static const struct of_device_id ak4104_of_match[] = { 289 { .compatible = "asahi-kasei,ak4104", }, 290 { } 291 }; 292 MODULE_DEVICE_TABLE(of, ak4104_of_match); 293 294 static struct spi_driver ak4104_spi_driver = { 295 .driver = { 296 .name = DRV_NAME, 297 .owner = THIS_MODULE, 298 .of_match_table = ak4104_of_match, 299 }, 300 .probe = ak4104_spi_probe, 301 .remove = ak4104_spi_remove, 302 }; 303 304 module_spi_driver(ak4104_spi_driver); 305 306 MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); 307 MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); 308 MODULE_LICENSE("GPL"); 309 310