diff options
Diffstat (limited to 'kernel/sound/soc/codecs/ak4104.c')
| -rw-r--r-- | kernel/sound/soc/codecs/ak4104.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/kernel/sound/soc/codecs/ak4104.c b/kernel/sound/soc/codecs/ak4104.c new file mode 100644 index 000000000..1fd7f72b2 --- /dev/null +++ b/kernel/sound/soc/codecs/ak4104.c @@ -0,0 +1,360 @@ +/* + * 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 <linux/spi/spi.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> +#include <linux/regulator/consumer.h> +#include <sound/asoundef.h> +#include <sound/core.h> +#include <sound/soc.h> +#include <sound/initval.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) + +struct ak4104_private { + struct regmap *regmap; + struct regulator *regulator; +}; + +static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = { +SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0), + +SND_SOC_DAPM_OUTPUT("TX"), +}; + +static const struct snd_soc_dapm_route ak4104_dapm_routes[] = { + { "TXE", NULL, "Playback" }, + { "TX", NULL, "TXE" }, +}; + +static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai, + unsigned int format) +{ + struct snd_soc_codec *codec = codec_dai->codec; + struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(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 = regmap_update_bits(ak4104->regmap, 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_codec *codec = dai->codec; + struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); + int ret, val = 0; + + /* set the IEC958 bits: consumer mode, no copyright bit */ + val |= IEC958_AES0_CON_NOT_COPYRIGHT; + regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val); + + val = 0; + + switch (params_rate(params)) { + case 22050: + val |= IEC958_AES3_CON_FS_22050; + break; + case 24000: + val |= IEC958_AES3_CON_FS_24000; + break; + case 32000: + val |= IEC958_AES3_CON_FS_32000; + break; + case 44100: + val |= IEC958_AES3_CON_FS_44100; + break; + case 48000: + val |= IEC958_AES3_CON_FS_48000; + break; + case 88200: + val |= IEC958_AES3_CON_FS_88200; + break; + case 96000: + val |= IEC958_AES3_CON_FS_96000; + break; + case 176400: + val |= IEC958_AES3_CON_FS_176400; + break; + case 192000: + val |= IEC958_AES3_CON_FS_192000; + break; + default: + dev_err(codec->dev, "unsupported sampling rate\n"); + return -EINVAL; + } + + ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val); + if (ret < 0) + return ret; + + return 0; +} + +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; + + ret = regulator_enable(ak4104->regulator); + if (ret < 0) { + dev_err(codec->dev, "Unable to enable regulator: %d\n", ret); + return ret; + } + + /* set power-up and non-reset bits */ + ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, + AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, + AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN); + if (ret < 0) + goto exit_disable_regulator; + + /* enable transmitter */ + ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX, + AK4104_TX_TXE, AK4104_TX_TXE); + if (ret < 0) + goto exit_disable_regulator; + + return 0; + +exit_disable_regulator: + regulator_disable(ak4104->regulator); + return ret; +} + +static int ak4104_remove(struct snd_soc_codec *codec) +{ + struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); + + regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1, + AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0); + regulator_disable(ak4104->regulator); + + return 0; +} + +#ifdef CONFIG_PM +static int ak4104_soc_suspend(struct snd_soc_codec *codec) +{ + struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec); + + regulator_disable(priv->regulator); + + return 0; +} + +static int ak4104_soc_resume(struct snd_soc_codec *codec) +{ + struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec); + int ret; + + ret = regulator_enable(priv->regulator); + if (ret < 0) + return ret; + + return 0; +} +#else +#define ak4104_soc_suspend NULL +#define ak4104_soc_resume NULL +#endif /* CONFIG_PM */ + +static struct snd_soc_codec_driver soc_codec_device_ak4104 = { + .probe = ak4104_probe, + .remove = ak4104_remove, + .suspend = ak4104_soc_suspend, + .resume = ak4104_soc_resume, + + .dapm_widgets = ak4104_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets), + .dapm_routes = ak4104_dapm_routes, + .num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes), +}; + +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 device_node *np = spi->dev.of_node; + 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->regulator = devm_regulator_get(&spi->dev, "vdd"); + if (IS_ERR(ak4104->regulator)) { + ret = PTR_ERR(ak4104->regulator); + dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret); + return ret; + } + + ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap); + if (IS_ERR(ak4104->regmap)) { + ret = PTR_ERR(ak4104->regmap); + return ret; + } + + if (np) { + enum of_gpio_flags flags; + int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags); + + if (gpio_is_valid(gpio)) { + ret = devm_gpio_request_one(&spi->dev, gpio, + flags & OF_GPIO_ACTIVE_LOW ? + GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, + "ak4104 reset"); + if (ret < 0) + 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) + return ret; + if (val != AK4104_RESERVED_VAL) + return -ENODEV; + + spi_set_drvdata(spi, ak4104); + + ret = snd_soc_register_codec(&spi->dev, + &soc_codec_device_ak4104, &ak4104_dai, 1); + return ret; +} + +static int ak4104_spi_remove(struct spi_device *spi) +{ + snd_soc_unregister_codec(&spi->dev); + return 0; +} + +static const struct of_device_id ak4104_of_match[] = { + { .compatible = "asahi-kasei,ak4104", }, + { } +}; +MODULE_DEVICE_TABLE(of, ak4104_of_match); + +static const struct spi_device_id ak4104_id_table[] = { + { "ak4104", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, ak4104_id_table); + +static struct spi_driver ak4104_spi_driver = { + .driver = { + .name = "ak4104", + .owner = THIS_MODULE, + .of_match_table = ak4104_of_match, + }, + .id_table = ak4104_id_table, + .probe = ak4104_spi_probe, + .remove = 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"); + |