diff options
Diffstat (limited to 'sound/soc/codecs/ak4104.c')
| -rw-r--r-- | sound/soc/codecs/ak4104.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/sound/soc/codecs/ak4104.c b/sound/soc/codecs/ak4104.c new file mode 100644 index 000000000000..338381f4fe1e --- /dev/null +++ b/sound/soc/codecs/ak4104.c @@ -0,0 +1,363 @@ +/* + * 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 <sound/core.h> +#include <sound/soc.h> +#include <sound/initval.h> +#include <linux/spi/spi.h> +#include <sound/asoundef.h> + +#include "ak4104.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" + +struct ak4104_private { + struct snd_soc_codec codec; + u8 reg_cache[AK4104_NUM_REGS]; +}; + +static int ak4104_fill_cache(struct snd_soc_codec *codec) +{ + int i; + u8 *reg_cache = codec->reg_cache; + struct spi_device *spi = codec->control_data; + + for (i = 0; i < codec->reg_cache_size; i++) { + int ret = spi_w8r8(spi, i | AK4104_READ); + if (ret < 0) { + dev_err(&spi->dev, "SPI write failure\n"); + return ret; + } + + reg_cache[i] = ret; + } + + return 0; +} + +static unsigned int ak4104_read_reg_cache(struct snd_soc_codec *codec, + unsigned int reg) +{ + u8 *reg_cache = codec->reg_cache; + + if (reg >= codec->reg_cache_size) + return -EINVAL; + + return reg_cache[reg]; +} + +static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg, + unsigned int value) +{ + u8 *cache = codec->reg_cache; + struct spi_device *spi = codec->control_data; + + if (reg >= codec->reg_cache_size) + return -EINVAL; + + reg &= AK4104_REG_MASK; + reg |= AK4104_WRITE; + + /* only write to the hardware if value has changed */ + if (cache[reg] != value) { + u8 tmp[2] = { reg, value }; + if (spi_write(spi, tmp, sizeof(tmp))) { + dev_err(&spi->dev, "SPI write failed\n"); + return -EIO; + } + + cache[reg] = value; + } + + return 0; +} + +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; + + val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); + if (val < 0) + return val; + + val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1); + + /* 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; + + return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); +} + +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_device *socdev = rtd->socdev; + struct snd_soc_codec *codec = socdev->card->codec; + int val = 0; + + /* set the IEC958 bits: consumer mode, no copyright bit */ + val |= IEC958_AES0_CON_NOT_COPYRIGHT; + ak4104_spi_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 ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val); +} + +struct snd_soc_dai ak4104_dai = { + .name = DRV_NAME, + .playback = { + .stream_name = "Playback", + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_44100 | + SNDRV_PCM_RATE_48000 | + SNDRV_PCM_RATE_32000, + .formats = SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S24_3LE | + SNDRV_PCM_FMTBIT_S24_LE + }, + .ops = { + .hw_params = ak4104_hw_params, + .set_fmt = ak4104_set_dai_fmt, + } +}; + +static struct snd_soc_codec *ak4104_codec; + +static int ak4104_spi_probe(struct spi_device *spi) +{ + struct snd_soc_codec *codec; + struct ak4104_private *ak4104; + int ret, val; + + spi->bits_per_word = 8; + spi->mode = SPI_MODE_0; + ret = spi_setup(spi); + if (ret < 0) + return ret; + + ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL); + if (!ak4104) { + dev_err(&spi->dev, "could not allocate codec\n"); + return -ENOMEM; + } + + codec = &ak4104->codec; + mutex_init(&codec->mutex); + INIT_LIST_HEAD(&codec->dapm_widgets); + INIT_LIST_HEAD(&codec->dapm_paths); + + codec->dev = &spi->dev; + codec->name = DRV_NAME; + codec->owner = THIS_MODULE; + codec->dai = &ak4104_dai; + codec->num_dai = 1; + codec->private_data = ak4104; + codec->control_data = spi; + codec->reg_cache = ak4104->reg_cache; + codec->reg_cache_size = AK4104_NUM_REGS; + + /* read all regs and fill the cache */ + ret = ak4104_fill_cache(codec); + if (ret < 0) { + dev_err(&spi->dev, "failed to fill register cache\n"); + 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. */ + if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) != + AK4104_RESERVED_VAL) { + ret = -ENODEV; + goto error_free_codec; + } + + /* set power-up and non-reset bits */ + val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1); + val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN; + ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val); + if (ret < 0) + goto error_free_codec; + + /* enable transmitter */ + val = ak4104_read_reg_cache(codec, AK4104_REG_TX); + val |= AK4104_TX_TXE; + ret = ak4104_spi_write(codec, AK4104_REG_TX, val); + if (ret < 0) + goto error_free_codec; + + ak4104_codec = codec; + ret = snd_soc_register_dai(&ak4104_dai); + if (ret < 0) { + dev_err(&spi->dev, "failed to register DAI\n"); + goto error_free_codec; + } + + spi_set_drvdata(spi, ak4104); + dev_info(&spi->dev, "SPI device initialized\n"); + return 0; + +error_free_codec: + kfree(ak4104); + ak4104_dai.dev = NULL; + return ret; +} + +static int __devexit ak4104_spi_remove(struct spi_device *spi) +{ + int ret, val; + struct ak4104_private *ak4104 = spi_get_drvdata(spi); + + val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1); + if (val < 0) + return val; + + /* clear power-up and non-reset bits */ + val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); + ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val); + if (ret < 0) + return ret; + + ak4104_codec = NULL; + kfree(ak4104); + return 0; +} + +static int ak4104_probe(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec = ak4104_codec; + int ret; + + /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */ + socdev->card->codec = codec; + + /* Register PCMs */ + ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); + if (ret < 0) { + dev_err(codec->dev, "failed to create pcms\n"); + return ret; + } + + /* Register the socdev */ + ret = snd_soc_init_card(socdev); + if (ret < 0) { + dev_err(codec->dev, "failed to register card\n"); + snd_soc_free_pcms(socdev); + return ret; + } + + return 0; +} + +static int ak4104_remove(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + snd_soc_free_pcms(socdev); + return 0; +}; + +struct snd_soc_codec_device soc_codec_device_ak4104 = { + .probe = ak4104_probe, + .remove = ak4104_remove +}; +EXPORT_SYMBOL_GPL(soc_codec_device_ak4104); + +static struct spi_driver ak4104_spi_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, + .probe = ak4104_spi_probe, + .remove = __devexit_p(ak4104_spi_remove), +}; + +static int __init ak4104_init(void) +{ + pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n"); + return spi_register_driver(&ak4104_spi_driver); +} +module_init(ak4104_init); + +static void __exit ak4104_exit(void) +{ + spi_unregister_driver(&ak4104_spi_driver); +} +module_exit(ak4104_exit); + +MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>"); +MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); +MODULE_LICENSE("GPL"); + |
