[RFC][PATCH 20/26] alsa: ASoC: Add JZ4740 codec driver

Lars-Peter Clausen
2010-06-02T19:14:34Z

This patch adds support for the JZ4740 internal codec.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: alsa-devel@alsa-project.org
---
sound/soc/codecs/Kconfig | 4 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/jz4740-codec.c | 502 +++++++++++++++++++++++++++++++++++++++
sound/soc/codecs/jz4740-codec.h | 20 ++
4 files changed, 528 insertions(+), 0 deletions(-)
create mode 100644 sound/soc/codecs/jz4740-codec.c
create mode 100644 sound/soc/codecs/jz4740-codec.h

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 31ac553..b8008df 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -23,6 +23,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_AK4671 if I2C
select SND_SOC_CQ0093VC if MFD_DAVINCI_VOICECODEC
select SND_SOC_CS4270 if I2C
+ select SND_SOC_JZ4740 if SOC_JZ4740
select SND_SOC_MAX9877 if I2C
select SND_SOC_DA7210 if I2C
select SND_SOC_PCM3008
@@ -269,6 +270,9 @@ config SND_SOC_WM9712
config SND_SOC_WM9713
tristate

+config SND_SOC_JZ4740_CODEC
+ tristate
+
# Amp
config SND_SOC_MAX9877
tristate
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 91429ea..4c7ee31 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -56,6 +56,7 @@ snd-soc-wm9705-objs := wm9705.o
snd-soc-wm9712-objs := wm9712.o
snd-soc-wm9713-objs := wm9713.o
snd-soc-wm-hubs-objs := wm_hubs.o
+snd-soc-jz4740-codec-objs := jz4740-codec.o

# Amp
snd-soc-max9877-objs := max9877.o
@@ -121,6 +122,7 @@ obj-$(CONFIG_SND_SOC_WM9705) += snd-soc-wm9705.o
obj-$(CONFIG_SND_SOC_WM9712) += snd-soc-wm9712.o
obj-$(CONFIG_SND_SOC_WM9713) += snd-soc-wm9713.o
obj-$(CONFIG_SND_SOC_WM_HUBS) += snd-soc-wm-hubs.o
+obj-$(CONFIG_SND_SOC_JZ4740_CODEC) += snd-soc-jz4740-codec.o

# Amp
obj-$(CONFIG_SND_SOC_MAX9877) += snd-soc-max9877.o
diff --git a/sound/soc/codecs/jz4740-codec.c b/sound/soc/codecs/jz4740-codec.c
new file mode 100644
index 0000000..6e4b741
--- /dev/null
+++ b/sound/soc/codecs/jz4740-codec.c
@@ -0,0 +1,502 @@
+/*
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/delay.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc-dapm.h>
+#include <sound/soc.h>
+
+#define JZ4740_REG_CODEC_1 0x0
+#define JZ4740_REG_CODEC_2 0x1
+
+#define JZ4740_CODEC_1_LINE_ENABLE BIT(29)
+#define JZ4740_CODEC_1_MIC_ENABLE BIT(28)
+#define JZ4740_CODEC_1_SW1_ENABLE BIT(27)
+#define JZ4740_CODEC_1_ADC_ENABLE BIT(26)
+#define JZ4740_CODEC_1_SW2_ENABLE BIT(25)
+#define JZ4740_CODEC_1_DAC_ENABLE BIT(24)
+#define JZ4740_CODEC_1_VREF_DISABLE BIT(20)
+#define JZ4740_CODEC_1_VREF_AMP_DISABLE BIT(19)
+#define JZ4740_CODEC_1_VREF_PULL_DOWN BIT(18)
+#define JZ4740_CODEC_1_VREF_LOW_CURRENT BIT(17)
+#define JZ4740_CODEC_1_VREF_HIGH_CURRENT BIT(16)
+#define JZ4740_CODEC_1_HEADPHONE_DISABLE BIT(14)
+#define JZ4740_CODEC_1_HEADPHONE_AMP_CHANGE_ANY BIT(13)
+#define JZ4740_CODEC_1_HEADPHONE_CHANGE BIT(12)
+#define JZ4740_CODEC_1_HEADPHONE_PULL_DOWN_M BIT(11)
+#define JZ4740_CODEC_1_HEADPHONE_PULL_DOWN_R BIT(10)
+#define JZ4740_CODEC_1_HEADPHONE_POWER_DOWN_M BIT(9)
+#define JZ4740_CODEC_1_HEADPHONE_POWER_DOWN BIT(8)
+#define JZ4740_CODEC_1_SUSPEND BIT(1)
+#define JZ4740_CODEC_1_RESET BIT(0)
+
+#define JZ4740_CODEC_1_LINE_ENABLE_OFFSET 29
+#define JZ4740_CODEC_1_MIC_ENABLE_OFFSET 28
+#define JZ4740_CODEC_1_SW1_ENABLE_OFFSET 27
+#define JZ4740_CODEC_1_ADC_ENABLE_OFFSET 26
+#define JZ4740_CODEC_1_SW2_ENABLE_OFFSET 25
+#define JZ4740_CODEC_1_DAC_ENABLE_OFFSET 24
+#define JZ4740_CODEC_1_HEADPHONE_DISABLE_OFFSET 14
+#define JZ4740_CODEC_1_HEADPHONE_POWER_DOWN_OFFSET 8
+
+#define JZ4740_CODEC_2_INPUT_VOLUME_MASK 0x1f0000
+#define JZ4740_CODEC_2_SAMPLE_RATE_MASK 0x000f00
+#define JZ4740_CODEC_2_MIC_BOOST_GAIN_MASK 0x000030
+#define JZ4740_CODEC_2_HEADPHONE_VOLUME_MASK 0x000003
+
+#define JZ4740_CODEC_2_INPUT_VOLUME_OFFSET 16
+#define JZ4740_CODEC_2_SAMPLE_RATE_OFFSET 8
+#define JZ4740_CODEC_2_MIC_BOOST_GAIN_OFFSET 4
+#define JZ4740_CODEC_2_HEADPHONE_VOLUME_OFFSET 0
+
+struct jz4740_codec {
+ void __iomem *base;
+ struct resource *mem;
+
+ uint32_t reg_cache[2];
+ struct snd_soc_codec codec;
+};
+
+static inline struct jz4740_codec *codec_to_jz4740(struct snd_soc_codec *codec)
+{
+ return container_of(codec, struct jz4740_codec, codec);
+}
+
+static unsigned int jz4740_codec_read(struct snd_soc_codec *codec, unsigned int reg)
+{
+ struct jz4740_codec *jz4740_codec = codec_to_jz4740(codec);
+ return readl(jz4740_codec->base + (reg << 2));
+}
+
+static int jz4740_codec_write(struct snd_soc_codec *codec, unsigned int reg,
+ unsigned int val)
+{
+ struct jz4740_codec *jz4740_codec = codec_to_jz4740(codec);
+ jz4740_codec->reg_cache[reg] = val;
+
+ writel(val, jz4740_codec->base + (reg << 2));
+ return 0;
+}
+
+static const struct snd_kcontrol_new jz4740_codec_controls[] = {
+ SOC_SINGLE("Master Playback Volume", JZ4740_REG_CODEC_2,
+ JZ4740_CODEC_2_HEADPHONE_VOLUME_OFFSET, 3, 0),
+ SOC_SINGLE("Capture Volume", JZ4740_REG_CODEC_2,
+ JZ4740_CODEC_2_INPUT_VOLUME_OFFSET, 31, 0),
+ SOC_SINGLE("Master Playback Switch", JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_HEADPHONE_DISABLE_OFFSET, 1, 1),
+ SOC_SINGLE("Mic Capture Volume", JZ4740_REG_CODEC_2,
+ JZ4740_CODEC_2_MIC_BOOST_GAIN_OFFSET, 3, 0),
+};
+
+static const struct snd_kcontrol_new jz4740_codec_output_controls[] = {
+ SOC_DAPM_SINGLE("Bypass Switch", JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_SW1_ENABLE_OFFSET, 1, 0),
+ SOC_DAPM_SINGLE("DAC Switch", JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_SW2_ENABLE_OFFSET, 1, 0),
+};
+
+static const struct snd_kcontrol_new jz4740_codec_input_controls[] = {
+ SOC_DAPM_SINGLE("Line Capture Switch", JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_LINE_ENABLE_OFFSET, 1, 0),
+ SOC_DAPM_SINGLE("Mic Capture Switch", JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_MIC_ENABLE_OFFSET, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget jz4740_codec_dapm_widgets[] = {
+ SND_SOC_DAPM_ADC("ADC", "Capture", JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_ADC_ENABLE_OFFSET, 0),
+ SND_SOC_DAPM_DAC("DAC", "Playback", JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_DAC_ENABLE_OFFSET, 0),
+
+ SND_SOC_DAPM_MIXER("Output Mixer", JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_HEADPHONE_POWER_DOWN_OFFSET, 1,
+ jz4740_codec_output_controls,
+ ARRAY_SIZE(jz4740_codec_output_controls)),
+
+ SND_SOC_DAPM_MIXER_NAMED_CTL("Input Mixer", SND_SOC_NOPM, 0, 0,
+ jz4740_codec_input_controls,
+ ARRAY_SIZE(jz4740_codec_input_controls)),
+ SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
+
+ SND_SOC_DAPM_OUTPUT("LOUT"),
+ SND_SOC_DAPM_OUTPUT("ROUT"),
+
+ SND_SOC_DAPM_INPUT("MIC"),
+ SND_SOC_DAPM_INPUT("LIN"),
+ SND_SOC_DAPM_INPUT("RIN"),
+};
+
+static const struct snd_soc_dapm_route jz4740_codec_dapm_routes[] = {
+
+ {"Line Input", NULL, "LIN"},
+ {"Line Input", NULL, "RIN"},
+
+ {"Input Mixer", "Line Capture Switch", "Line Input"},
+ {"Input Mixer", "Mic Capture Switch", "MIC"},
+
+ {"ADC", NULL, "Input Mixer"},
+
+ {"Output Mixer", "Bypass Switch", "Input Mixer"},
+ {"Output Mixer", "DAC Switch", "DAC"},
+
+ {"LOUT", NULL, "Output Mixer"},
+ {"ROUT", NULL, "Output Mixer"},
+};
+
+static int jz4740_codec_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+ uint32_t val;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_device *socdev = rtd->socdev;
+ struct snd_soc_codec *codec = socdev->card->codec;
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S8:
+ case SNDRV_PCM_FORMAT_S16_LE:
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ break;
+ default:
+ return -EINVAL;
+ break;
+ }
+
+ switch (params_rate(params)) {
+ case 8000:
+ val = 0;
+ break;
+ case 11025:
+ val = 1;
+ break;
+ case 12000:
+ val = 2;
+ break;
+ case 16000:
+ val = 3;
+ break;
+ case 22050:
+ val = 4;
+ break;
+ case 24000:
+ val = 5;
+ break;
+ case 32000:
+ val = 6;
+ break;
+ case 44100:
+ val = 7;
+ break;
+ case 48000:
+ val = 8;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ val <<= JZ4740_CODEC_2_SAMPLE_RATE_OFFSET;
+
+ snd_soc_update_bits(codec, JZ4740_REG_CODEC_2,
+ JZ4740_CODEC_2_SAMPLE_RATE_MASK, val);
+
+ return 0;
+}
+
+static int jz4740_codec_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct snd_soc_dai_ops jz4740_codec_dai_ops = {
+ .hw_params = jz4740_codec_hw_params,
+ .set_fmt = jz4740_codec_set_fmt,
+};
+
+struct snd_soc_dai jz4740_codec_dai = {
+ .name = "jz-codec",
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
+ },
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
+ },
+ .ops = &jz4740_codec_dai_ops,
+ .symmetric_rates = 1,
+};
+EXPORT_SYMBOL_GPL(jz4740_codec_dai);
+
+static int jz4740_codec_set_bias_level(struct snd_soc_codec *codec,
+ enum snd_soc_bias_level level)
+{
+
+ if (codec->bias_level == SND_SOC_BIAS_OFF && level != SND_SOC_BIAS_OFF) {
+ snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_RESET, JZ4740_CODEC_1_RESET);
+ udelay(2);
+
+ snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_SUSPEND | JZ4740_CODEC_1_RESET, 0);
+ }
+ switch (level) {
+ case SND_SOC_BIAS_ON:
+ snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_VREF_DISABLE |
+ JZ4740_CODEC_1_VREF_AMP_DISABLE |
+ JZ4740_CODEC_1_HEADPHONE_POWER_DOWN_M |
+ JZ4740_CODEC_1_VREF_LOW_CURRENT |
+ JZ4740_CODEC_1_VREF_HIGH_CURRENT,
+ 0);
+ break;
+ case SND_SOC_BIAS_PREPARE:
+ snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_VREF_LOW_CURRENT |
+ JZ4740_CODEC_1_VREF_HIGH_CURRENT,
+ JZ4740_CODEC_1_VREF_LOW_CURRENT |
+ JZ4740_CODEC_1_VREF_HIGH_CURRENT);
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_VREF_DISABLE | JZ4740_CODEC_1_VREF_AMP_DISABLE,
+ JZ4740_CODEC_1_VREF_DISABLE | JZ4740_CODEC_1_VREF_AMP_DISABLE);
+ break;
+ case SND_SOC_BIAS_OFF:
+ snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_SUSPEND, JZ4740_CODEC_1_SUSPEND);
+ break;
+ }
+ codec->bias_level = level;
+
+ return 0;
+}
+
+
+static struct snd_soc_codec *jz4740_codec_codec;
+
+static int jz4740_codec_dev_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = jz4740_codec_codec;
+
+ BUG_ON(!codec);
+
+ socdev->card->codec = codec;
+
+ ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to create pcms: %d\n", ret);
+ return ret;
+ }
+
+ snd_soc_add_controls(codec, jz4740_codec_controls,
+ ARRAY_SIZE(jz4740_codec_controls));
+
+ snd_soc_dapm_new_controls(codec, jz4740_codec_dapm_widgets,
+ ARRAY_SIZE(jz4740_codec_dapm_widgets));
+
+ snd_soc_dapm_add_routes(codec, jz4740_codec_dapm_routes,
+ ARRAY_SIZE(jz4740_codec_dapm_routes));
+
+ snd_soc_dapm_new_widgets(codec);
+
+ return 0;
+}
+
+static int jz4740_codec_dev_remove(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ snd_soc_free_pcms(socdev);
+ snd_soc_dapm_free(socdev);
+
+ return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_jz4740_codec = {
+ .probe = jz4740_codec_dev_probe,
+ .remove = jz4740_codec_dev_remove,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_jz4740_codec);
+
+static int __devinit jz4740_codec_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct jz4740_codec *jz4740_codec;
+ struct snd_soc_codec *codec;
+
+ jz4740_codec = kzalloc(sizeof(*jz4740_codec), GFP_KERNEL);
+
+ if (!jz4740_codec)
+ return -ENOMEM;
+
+ jz4740_codec->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ if (!jz4740_codec->mem) {
+ dev_err(&pdev->dev, "Failed to get mmio memory resource\n");
+ ret = -ENOENT;
+ goto err_free_codec;
+ }
+
+ jz4740_codec->mem = request_mem_region(jz4740_codec->mem->start,
+ resource_size(jz4740_codec->mem), pdev->name);
+
+ if (!jz4740_codec->mem) {
+ dev_err(&pdev->dev, "Failed to request mmio memory region\n");
+ ret = -EBUSY;
+ goto err_free_codec;
+ }
+
+ jz4740_codec->base = ioremap(jz4740_codec->mem->start, resource_size(jz4740_codec->mem));
+
+ if (!jz4740_codec->base) {
+ dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
+ ret = -EBUSY;
+ goto err_release_mem_region;
+ }
+
+ jz4740_codec_dai.dev = &pdev->dev;
+
+ codec = &jz4740_codec->codec;
+
+ codec->dev = &pdev->dev;
+ codec->name = "jz-codec";
+ codec->owner = THIS_MODULE;
+
+ codec->read = jz4740_codec_read;
+ codec->write = jz4740_codec_write;
+ codec->set_bias_level = jz4740_codec_set_bias_level;
+ codec->bias_level = SND_SOC_BIAS_OFF;
+
+ codec->dai = &jz4740_codec_dai;
+ codec->num_dai = 1;
+
+ codec->reg_cache = jz4740_codec->reg_cache;
+ codec->reg_cache_size = 2;
+
+ mutex_init(&codec->mutex);
+ INIT_LIST_HEAD(&codec->dapm_widgets);
+ INIT_LIST_HEAD(&codec->dapm_paths);
+
+ jz4740_codec_codec = codec;
+
+ snd_soc_update_bits(codec, JZ4740_REG_CODEC_1,
+ JZ4740_CODEC_1_SW2_ENABLE, JZ4740_CODEC_1_SW2_ENABLE);
+
+
+ platform_set_drvdata(pdev, jz4740_codec);
+ ret = snd_soc_register_codec(codec);
+
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register codec\n");
+ goto err_iounmap;
+ }
+
+ ret = snd_soc_register_dai(&jz4740_codec_dai);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register codec dai\n");
+ goto err_unregister_codec;
+ }
+
+ jz4740_codec_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+ return 0;
+err_unregister_codec:
+ snd_soc_unregister_codec(codec);
+err_iounmap:
+ iounmap(jz4740_codec->base);
+err_release_mem_region:
+ release_mem_region(jz4740_codec->mem->start, resource_size(jz4740_codec->mem));
+err_free_codec:
+ kfree(jz4740_codec);
+
+ return ret;
+}
+
+static int __devexit jz4740_codec_remove(struct platform_device *pdev)
+{
+ struct jz4740_codec *jz4740_codec = platform_get_drvdata(pdev);
+
+ snd_soc_unregister_dai(&jz4740_codec_dai);
+ snd_soc_unregister_codec(&jz4740_codec->codec);
+
+ iounmap(jz4740_codec->base);
+ release_mem_region(jz4740_codec->mem->start, resource_size(jz4740_codec->mem));
+
+ platform_set_drvdata(pdev, NULL);
+ kfree(jz4740_codec);
+
+ return 0;
+}
+
+static struct platform_driver jz4740_codec_driver = {
+ .probe = jz4740_codec_probe,
+ .remove = __devexit_p(jz4740_codec_remove),
+ .driver = {
+ .name = "jz4740-codec",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init jz4740_codec_init(void)
+{
+ return platform_driver_register(&jz4740_codec_driver);
+}
+module_init(jz4740_codec_init);
+
+static void __exit jz4740_codec_exit(void)
+{
+ platform_driver_unregister(&jz4740_codec_driver);
+}
+module_exit(jz4740_codec_exit);
+
+MODULE_DESCRIPTION("JZ4740 SoC internal codec driver");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:jz-codec");
diff --git a/sound/soc/codecs/jz4740-codec.h b/sound/soc/codecs/jz4740-codec.h
new file mode 100644
index 0000000..b5a0691
--- /dev/null
+++ b/sound/soc/codecs/jz4740-codec.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef __SND_SOC_CODECS_JZ4740_CODEC_H__
+#define __SND_SOC_CODECS_JZ4740_CODEC_H__
+
+extern struct snd_soc_dai jz4740_codec_dai;
+extern struct snd_soc_codec_device soc_codec_dev_jz4740_codec;
+
+#endif
--
1.5.6.5