diff options
Diffstat (limited to 'sound/soc/codecs/ak4104.c')
| -rw-r--r-- | sound/soc/codecs/ak4104.c | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/sound/soc/codecs/ak4104.c b/sound/soc/codecs/ak4104.c new file mode 100644 index 00000000..ceb96ecf --- /dev/null +++ b/sound/soc/codecs/ak4104.c @@ -0,0 +1,258 @@ +/* + * AK4104 ALSA SoC (ASoC) driver + * + * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <sound/core.h> +#include <sound/soc.h> +#include <sound/initval.h> +#include <linux/spi/spi.h> +#include <sound/asoundef.h> + +/* AK4104 registers addresses */ +#define AK4104_REG_CONTROL1 0x00 +#define AK4104_REG_RESERVED 0x01 +#define AK4104_REG_CONTROL2 0x02 +#define AK4104_REG_TX 0x03 +#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04) +#define AK4104_NUM_REGS 10 + +#define AK4104_REG_MASK 0x1f +#define AK4104_READ 0xc0 +#define AK4104_WRITE 0xe0 +#define AK4104_RESERVED_VAL 0x5b + +/* Bit masks for AK4104 registers */ +#define AK4104_CONTROL1_RSTN (1 << 0) +#define AK4104_CONTROL1_PW (1 << 1) +#define AK4104_CONTROL1_DIF0 (1 << 2) +#define AK4104_CONTROL1_DIF1 (1 << 3) + +#define AK4104_CONTROL2_SEL0 (1 << 0) +#define AK4104_CONTROL2_SEL1 (1 << 1) +#define AK4104_CONTROL2_MODE (1 << 2) + +#define AK4104_TX_TXE (1 << 0) +#define AK4104_TX_V (1 << 1) + +#define DRV_NAME "ak4104-codec" + +struct ak4104_private { + struct regmap *regmap; +}; + +static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, + unsigned int format) +{ + struct snd_soc_codec *codec = codec_dai->codec; + int val = 0; + int ret; + + /* set DAI format */ + switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_RIGHT_J: + break; + case SND_SOC_DAIFMT_LEFT_J: + val |= AK4104_CONTROL1_DIF0; + break; + case SND_SOC_DAIFMT_I2S: + val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1; + break; + default: + dev_err(codec->dev, "invalid dai format\n"); + return -EINVAL; + } + + /* This device can only be slave */ + if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) + return -EINVAL; + + ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1, + AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1, + val); + if (ret < 0) + return ret; + + return 0; +} + +static int ak4104_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_codec *codec = rtd->codec; + int val = 0; + + /* set the IEC958 bits: consumer mode, no copyright bit */ + val |= IEC958_AES0_CON_NOT_COPYRIGHT; + snd_soc_write(codec, AK4104_REG_CHN_STATUS(0), val); + + val = 0; + + switch (params_rate(params)) { + case 44100: + val |= IEC958_AES3_CON_FS_44100; + break; + case 48000: + val |= IEC958_AES3_CON_FS_48000; + break; + case 32000: + val |= IEC958_AES3_CON_FS_32000; + break; + default: + dev_err(codec->dev, "unsupported sampling rate\n"); + return -EINVAL; + } + + return snd_soc_write(codec, AK4104_REG_CHN_STATUS(3), val); +} + +static const struct snd_soc_dai_ops ak4101_dai_ops = { + .hw_params = ak4104_hw_params, + .set_fmt = ak4104_set_dai_fmt, +}; + +static struct snd_soc_dai_driver ak4104_dai = { + .name = "ak4104-hifi", + .playback = { + .stream_name = "Playback", + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_8000_192000, + .formats = SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S24_3LE | + SNDRV_PCM_FMTBIT_S24_LE + }, + .ops = &ak4101_dai_ops, +}; + +static int ak4104_probe(struct snd_soc_codec *codec) +{ + struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); + int ret; + + codec->control_data = ak4104->regmap; + ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP); + if (ret != 0) + return ret; + + /* set power-up and non-reset bits */ + ret = snd_soc_update_bits(codec, AK4104_REG_CONTROL1, + AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, + AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); + if (ret < 0) + return ret; + + /* enable transmitter */ + ret = snd_soc_update_bits(codec, AK4104_REG_TX, + AK4104_TX_TXE, AK4104_TX_TXE); + if (ret < 0) + return ret; + + return 0; +} + +static int ak4104_remove(struct snd_soc_codec *codec) +{ + snd_soc_update_bits(codec, AK4104_REG_CONTROL1, + AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); + + return 0; +} + +static struct snd_soc_codec_driver soc_codec_device_ak4104 = { + .probe = ak4104_probe, + .remove = ak4104_remove, +}; + +static const struct regmap_config ak4104_regmap = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = AK4104_NUM_REGS - 1, + .read_flag_mask = AK4104_READ, + .write_flag_mask = AK4104_WRITE, + + .cache_type = REGCACHE_RBTREE, +}; + +static int ak4104_spi_probe(struct spi_device *spi) +{ + struct ak4104_private *ak4104; + unsigned int val; + int ret; + + spi->bits_per_word = 8; + spi->mode = SPI_MODE_0; + ret = spi_setup(spi); + if (ret < 0) + return ret; + + ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private), + GFP_KERNEL); + if (ak4104 == NULL) + return -ENOMEM; + + ak4104->regmap = regmap_init_spi(spi, &ak4104_regmap); + if (IS_ERR(ak4104->regmap)) { + ret = PTR_ERR(ak4104->regmap); + return ret; + } + + /* read the 'reserved' register - according to the datasheet, it + * should contain 0x5b. Not a good way to verify the presence of + * the device, but there is no hardware ID register. */ + ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val); + if (ret != 0) + goto err; + if (val != AK4104_RESERVED_VAL) { + ret = -ENODEV; + goto err; + } + + spi_set_drvdata(spi, ak4104); + + ret = snd_soc_register_codec(&spi->dev, + &soc_codec_device_ak4104, &ak4104_dai, 1); + if (ret != 0) + goto err; + + return 0; + +err: + regmap_exit(ak4104->regmap); + return ret; +} + +static int __devexit ak4104_spi_remove(struct spi_device *spi) +{ + struct ak4104_private *ak4101 = spi_get_drvdata(spi); + regmap_exit(ak4101->regmap); + snd_soc_unregister_codec(&spi->dev); + return 0; +} + +static struct spi_driver ak4104_spi_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, + .probe = ak4104_spi_probe, + .remove = __devexit_p(ak4104_spi_remove), +}; + +module_spi_driver(ak4104_spi_driver); + +MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); +MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); +MODULE_LICENSE("GPL"); + |