This patch introduces a (spi) codec driver for the Texas Instruments DSD1791 24 bit audio stereo DAC.
Testing for basic operation using 16 and 24 bit I2S mode has been performed.
http://www.ti.com/product/dsd1791
Signed-off-by: Michael Williamson michael.williamson@criticallink.com --- sound/soc/codecs/Kconfig | 4 + sound/soc/codecs/Makefile | 2 + sound/soc/codecs/dsd1791.c | 282 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 288 insertions(+), 0 deletions(-) create mode 100644 sound/soc/codecs/dsd1791.c
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig index 4584514..95b7969 100644 --- a/sound/soc/codecs/Kconfig +++ b/sound/soc/codecs/Kconfig @@ -33,6 +33,7 @@ config SND_SOC_ALL_CODECS select SND_SOC_CX20442 select SND_SOC_DA7210 if I2C select SND_SOC_DFBMCS320 + select SND_SOC_DSD1791 if SPI_MASTER select SND_SOC_JZ4740_CODEC if SOC_JZ4740 select SND_SOC_LM4857 if I2C select SND_SOC_MAX98088 if I2C @@ -205,6 +206,9 @@ config SND_SOC_DA7210 config SND_SOC_DFBMCS320 tristate
+config SND_SOC_DSD1791 + tristate + config SND_SOC_DMIC tristate
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile index a2c7842..d6b5f6a 100644 --- a/sound/soc/codecs/Makefile +++ b/sound/soc/codecs/Makefile @@ -21,6 +21,7 @@ snd-soc-cx20442-objs := cx20442.o snd-soc-da7210-objs := da7210.o snd-soc-dfbmcs320-objs := dfbmcs320.o snd-soc-dmic-objs := dmic.o +snd-soc-dsd1791-objs := dsd1791.o snd-soc-l3-objs := l3.o snd-soc-max98088-objs := max98088.o snd-soc-max98095-objs := max98095.o @@ -120,6 +121,7 @@ obj-$(CONFIG_SND_SOC_CS4271) += snd-soc-cs4271.o obj-$(CONFIG_SND_SOC_CX20442) += snd-soc-cx20442.o obj-$(CONFIG_SND_SOC_DA7210) += snd-soc-da7210.o obj-$(CONFIG_SND_SOC_DFBMCS320) += snd-soc-dfbmcs320.o +obj-$(CONFIG_SND_SOC_DSD1791) += snd-soc-dsd1791.o obj-$(CONFIG_SND_SOC_DMIC) += snd-soc-dmic.o obj-$(CONFIG_SND_SOC_L3) += snd-soc-l3.o obj-$(CONFIG_SND_SOC_JZ4740_CODEC) += snd-soc-jz4740-codec.o diff --git a/sound/soc/codecs/dsd1791.c b/sound/soc/codecs/dsd1791.c new file mode 100644 index 0000000..dbba71b --- /dev/null +++ b/sound/soc/codecs/dsd1791.c @@ -0,0 +1,282 @@ +/* + * ALSA SoC codec driver for Texas Instruments DSD1791. + * + * Author: (C) Michael Williamson michael.williamson@criticallink.com + * Copyright: (C) 2011 Critical Link, LLC + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/pm.h> +#include <linux/spi/spi.h> +#include <linux/platform_device.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> +#include <sound/soc-dapm.h> +#include <sound/initval.h> +#include <sound/tlv.h> + +#define DSD1791_REG_DIGATT_L 16 +#define DSD1791_REG_DIGATT_R 17 +#define DSD1791_REG_AUDFMT 18 + +#define DSD1791_FMT_16RJ (0<<4) +#define DSD1791_FMT_20RJ (1<<4) +#define DSD1791_FMT_24RJ (2<<4) +#define DSD1791_FMT_24LJ (3<<4) +#define DSD1791_FMT_16I2S (4<<4) +#define DSD1791_FMT_24I2S (5<<4) + +#define DSD1971_FORMAT_S16_LE 0 +#define DSD1971_FORMAT_S24_LE 1 + +#define DSD1791_DAIFMT_I2S 0 +#define DSD1791_DAIFMT_RIGHT_J 1 +#define DSD1791_DAIFMT_LEFT_J 2 + +struct dsd1791 { + struct spi_device *spi; + struct snd_soc_codec codec; + int mclk; + int dai_fmt; + int pcm_fmt; +}; + +/* + * write to the dsd1791 register space + */ +static int dsd1791_write(struct snd_soc_codec *codec, unsigned int reg, + unsigned int value) +{ + struct dsd1791 *dsd1791 = snd_soc_codec_get_drvdata(codec); + u8 buffer[2]; + int rc; + + buffer[0] = (reg & 0x7F); + buffer[1] = value & 0xFF; + rc = spi_write(dsd1791->spi, buffer, 2); + if (rc) { + dev_err(&dsd1791->spi->dev, "DSD1791 reg write error (%d)\n", + rc); + return -EIO; + } + return 0; +} + +/* + * read from the dsd1791 register space + */ +static unsigned int dsd1791_read(struct snd_soc_codec *codec, + unsigned int reg) +{ + /* + * DSD1791 read capablity requires multipurposing the ZEROL signal + * from the codec. This is a non-standard mode and is not supported + * on any available hardware for testing. For now, don't allow it. + */ + return -EIO; +} + +static int dsd1791_set_format_word(struct dsd1791 *dsd1791, + struct snd_soc_codec *codec) +{ + u8 fmt = 0; + switch (dsd1791->dai_fmt) { + + case DSD1791_DAIFMT_I2S: + if (dsd1791->pcm_fmt == DSD1971_FORMAT_S16_LE) + fmt = DSD1791_FMT_16I2S; + else if (dsd1791->pcm_fmt == DSD1971_FORMAT_S24_LE) + fmt = DSD1791_FMT_24I2S; + else + return -EINVAL; + break; + + case DSD1791_DAIFMT_RIGHT_J: + if (dsd1791->pcm_fmt == DSD1971_FORMAT_S16_LE) + fmt = DSD1791_FMT_16RJ; + else if (dsd1791->pcm_fmt == DSD1971_FORMAT_S24_LE) + fmt = DSD1791_FMT_24RJ; + else + return -EINVAL; + break; + + case DSD1791_DAIFMT_LEFT_J: + if (dsd1791->pcm_fmt == DSD1971_FORMAT_S24_LE) + fmt = DSD1791_FMT_24LJ; + else + return -EINVAL; + break; + + default: + return -EINVAL; + } + return dsd1791_write(codec, DSD1791_REG_AUDFMT, fmt); +} + +static int dsd1791_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; + struct dsd1791 *dsd1791 = snd_soc_codec_get_drvdata(codec); + + switch (params_format(params)) { + + case SNDRV_PCM_FORMAT_S16_LE: + dsd1791->pcm_fmt = DSD1971_FORMAT_S16_LE; + break; + + case SNDRV_PCM_FORMAT_S24_LE: + dsd1791->pcm_fmt = DSD1971_FORMAT_S24_LE; + break; + default: + dev_dbg(&dsd1791->spi->dev, "bad format\n"); + return -EINVAL; + } + + return dsd1791_set_format_word(dsd1791, codec); +} + +static int dsd1791_set_sysclk(struct snd_soc_dai *codec_dai, + int clk_id, unsigned int freq, int dir) +{ + struct snd_soc_codec *codec = codec_dai->codec; + struct dsd1791 *dsd1791 = snd_soc_codec_get_drvdata(codec); + dsd1791->mclk = freq; + return 0; +} + +static int dsd1791_set_fmt(struct snd_soc_dai *codec_dai, + unsigned int fmt) +{ + struct snd_soc_codec *codec = codec_dai->codec; + struct dsd1791 *dsd1791 = snd_soc_codec_get_drvdata(codec); + + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + dsd1791->dai_fmt = DSD1791_DAIFMT_I2S; + break; + case SND_SOC_DAIFMT_RIGHT_J: + dsd1791->dai_fmt = DSD1791_DAIFMT_RIGHT_J; + break; + case SND_SOC_DAIFMT_LEFT_J: + dsd1791->dai_fmt = DSD1791_DAIFMT_LEFT_J; + break; + default: + dev_dbg(&dsd1791->spi->dev, "bad format\n"); + return -EINVAL; + } + + return dsd1791_set_format_word(dsd1791, codec); +} + +#define DSD1791_RATES SNDRV_PCM_RATE_8000_192000 +#define DSD1791_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\ + SNDRV_PCM_FMTBIT_S24_LE) + +static struct snd_soc_dai_ops dsd1791_dai_ops = { + .hw_params = dsd1791_hw_params, + .set_sysclk = dsd1791_set_sysclk, + .set_fmt = dsd1791_set_fmt, +}; + +struct snd_soc_dai_driver dsd1791_dai = { + .name = "dsd1791", + .playback = { + .stream_name = "Playback", + .channels_min = 2, + .channels_max = 2, + .rates = DSD1791_RATES, + .formats = DSD1791_FORMATS, + }, + .ops = &dsd1791_dai_ops, +}; + +static const struct snd_kcontrol_new dsd1791_snd_controls[] = { +}; + +static int dsd1791_probe(struct snd_soc_codec *codec) +{ + int err; + + err = snd_soc_add_controls(codec, dsd1791_snd_controls, + ARRAY_SIZE(dsd1791_snd_controls)); + WARN_ON(err < 0); + + return 0; +} + +struct snd_soc_codec_driver dsd1791_soc_codec_dev = { + .probe = dsd1791_probe, + .read = dsd1791_read, + .write = dsd1791_write, + .reg_word_size = sizeof(u8), +}; + +static int dsd1791_spi_probe(struct spi_device *spi) +{ + struct dsd1791 *dsd1791; + int ret; + + dev_info(&spi->dev, "probing dsd1791 spi device\n"); + + dsd1791 = kzalloc(sizeof *dsd1791, GFP_KERNEL); + if (!dsd1791) + return -ENOMEM; + + dsd1791->spi = spi; + dev_set_drvdata(&spi->dev, dsd1791); + + ret = snd_soc_register_codec(&spi->dev, + &dsd1791_soc_codec_dev, &dsd1791_dai, 1); + + if (ret < 0) { + kfree(dsd1791); + dev_warn(&spi->dev, "Unable to register codec (%d)\n", ret); + } else + dev_info(&spi->dev, "SPI device initialized\n"); + return 0; +}; + +static int dsd1791_spi_remove(struct spi_device *spi) +{ + snd_soc_unregister_codec(&spi->dev); + kfree(spi_get_drvdata(spi)); + return 0; +} + +static struct spi_driver dsd1791_spi = { + .driver = { + .name = "dsd1791-codec", + .owner = THIS_MODULE, + }, + .probe = dsd1791_spi_probe, + .remove = dsd1791_spi_remove, +}; + +static int __init dsd1791_init(void) +{ + spi_register_driver(&dsd1791_spi); + + return 0; +} +module_init(dsd1791_init); + +static void __exit dsd1791_exit(void) +{ + spi_unregister_driver(&dsd1791_spi); +} +module_exit(dsd1791_exit); + +MODULE_DESCRIPTION("ASoC DSD1791 codec driver"); +MODULE_AUTHOR("Michael Williamson"); +MODULE_LICENSE("GPL");