[alsa-devel] [RFC PATCH 1/1] ASoC: dsd1791: Introduce driver for TI DSD1791 stereo codec
Michael Williamson
michael.williamson at criticallink.com
Thu Dec 15 00:40:43 CET 2011
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 at 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 at 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");
--
1.7.5.4
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