Message-Id: <1277160391-14737-1-git-send-email-lars@metafoo.de>
Date:	Tue, 22 Jun 2010 00:46:31 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Lars-Peter Clausen <lars@...afoo.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	alsa-devel@...a-project.org
Subject: [PATCH v4] alsa: ASoC: Add JZ4740 codec driver

This patch adds support for the JZ4740 internal codec.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@...mlogic.co.uk>
Cc: alsa-devel@...a-project.org

---
Changes since v1
- Put Kconfig entry in alphabetic order
- Drop codec_set_fmt since the codec supports only one format
- Rename "Capture Volume" control to "Master Capture Volume"
- Drop unnecessary format checks
- Add suspend/resume
- Cleanup jz4740_codec_set_bias_level

Changes since v2
- Drop codec prefix from the filename. Note that I keeped it for the object
  name, because otherwise when build as a module it will clash with the ASoC
  JZ4740 platform support.

Changes since v3
- Hook up suspend/resume callbacks to the codec instead of the platform device
---
 sound/soc/codecs/Kconfig  |    4 +
 sound/soc/codecs/Makefile |    2 +
 sound/soc/codecs/jz4740.c |  511 +++++++++++++++++++++++++++++++++++++++++++++
 sound/soc/codecs/jz4740.h |   20 ++
 4 files changed, 537 insertions(+), 0 deletions(-)
 create mode 100644 sound/soc/codecs/jz4740.c
 create mode 100644 sound/soc/codecs/jz4740.h

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index c37c844..00d347d 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -24,6 +24,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_CQ0093VC if MFD_DAVINCI_VOICECODEC
 	select SND_SOC_CS42L51 if I2C
 	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
@@ -142,6 +143,9 @@ config SND_SOC_CS4270_VD33_ERRATA
 config SND_SOC_CX20442
 	tristate
 
+config SND_SOC_JZ4740_CODEC
+	tristate
+
 config SND_SOC_L3
        tristate
 
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 4a9c205..d8d9eeb 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -57,6 +57,7 @@ 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.o
 
 # Amp
 snd-soc-max9877-objs := max9877.o
@@ -80,6 +81,7 @@ obj-$(CONFIG_SND_SOC_CS4270)	+= snd-soc-cs4270.o
 obj-$(CONFIG_SND_SOC_CX20442)	+= snd-soc-cx20442.o
 obj-$(CONFIG_SND_SOC_DA7210)	+= snd-soc-da7210.o
 obj-$(CONFIG_SND_SOC_L3)	+= snd-soc-l3.o
+obj-$(CONFIG_SND_SOC_JZ4740_CODEC)	+= snd-soc-jz4740-codec.o
 obj-$(CONFIG_SND_SOC_PCM3008)	+= snd-soc-pcm3008.o
 obj-$(CONFIG_SND_SOC_SPDIF)	+= snd-soc-spdif.o
 obj-$(CONFIG_SND_SOC_SSM2602)	+= snd-soc-ssm2602.o
diff --git a/sound/soc/codecs/jz4740.c b/sound/soc/codecs/jz4740.c
new file mode 100644
index 0000000..66557de
--- /dev/null
+++ b/sound/soc/codecs/jz4740.c
@@ -0,0 +1,511 @@
+/*
+ * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@...afoo.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_PULLDOWN 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_CHARGE BIT(12)
+#define JZ4740_CODEC_1_HEADPHONE_PULLDOWN (BIT(11) | BIT(10))
+#define JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M BIT(9)
+#define JZ4740_CODEC_1_HEADPHONE_POWERDOWN 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_POWERDOWN_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
+
+static const uint32_t jz4740_codec_regs[] = {
+	0x021b2302, 0x00170803,
+};
+
+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("Master 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_POWERDOWN_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_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 struct snd_soc_dai_ops jz4740_codec_dai_ops = {
+	.hw_params = jz4740_codec_hw_params,
+};
+
+struct snd_soc_dai jz4740_codec_dai = {
+	.name = "jz4740",
+	.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 void jz4740_codec_wakeup(struct snd_soc_codec *codec)
+{
+	int i;
+	uint32_t *cache = codec->reg_cache;
+
+	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);
+
+	for (i = 0; i < ARRAY_SIZE(jz4740_codec_regs); ++i)
+		jz4740_codec_write(codec, i, cache[i]);
+}
+
+static int jz4740_codec_set_bias_level(struct snd_soc_codec *codec,
+	enum snd_soc_bias_level level)
+{
+	unsigned int mask;
+	unsigned int value;
+
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+		break;
+	case SND_SOC_BIAS_PREPARE:
+		mask = JZ4740_CODEC_1_VREF_DISABLE |
+				JZ4740_CODEC_1_VREF_AMP_DISABLE |
+				JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
+		value = 0;
+
+		snd_soc_update_bits(codec, JZ4740_REG_CODEC_1, mask, value);
+		break;
+	case SND_SOC_BIAS_STANDBY:
+		/* The only way to clear the suspend flag is to reset the codec */
+		if (codec->bias_level == SND_SOC_BIAS_OFF)
+			jz4740_codec_wakeup(codec);
+
+		mask = JZ4740_CODEC_1_VREF_DISABLE |
+			JZ4740_CODEC_1_VREF_AMP_DISABLE |
+			JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
+		value = JZ4740_CODEC_1_VREF_DISABLE |
+			JZ4740_CODEC_1_VREF_AMP_DISABLE |
+			JZ4740_CODEC_1_HEADPHONE_POWERDOWN_M;
+
+		snd_soc_update_bits(codec, JZ4740_REG_CODEC_1, mask, value);
+		break;
+	case SND_SOC_BIAS_OFF:
+		mask = JZ4740_CODEC_1_SUSPEND;
+		value = JZ4740_CODEC_1_SUSPEND;
+
+		snd_soc_update_bits(codec, JZ4740_REG_CODEC_1, mask, value);
+		break;
+	default:
+		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;
+}
+
+#ifdef CONFIG_PM_SLEEP
+
+static int jz4740_codec_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	return jz4740_codec_set_bias_level(codec, SND_SOC_BIAS_OFF);
+}
+
+static int jz4740_codec_resume(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	return jz4740_codec_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+}
+
+#else
+#define jz4740_codec_suspend NULL
+#define jz4740_codec_resume NULL
+#endif
+
+struct snd_soc_codec_device soc_codec_dev_jz4740_codec = {
+	.probe = jz4740_codec_dev_probe,
+	.remove = jz4740_codec_dev_remove,
+	.suspend = jz4740_codec_suspend,
+	.resume = jz4740_codec_resume,
+};
+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;
+	struct resource *mem;
+
+	jz4740_codec = kzalloc(sizeof(*jz4740_codec), GFP_KERNEL);
+	if (!jz4740_codec)
+		return -ENOMEM;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		dev_err(&pdev->dev, "Failed to get mmio memory resource\n");
+		ret = -ENOENT;
+		goto err_free_codec;
+	}
+
+	mem = request_mem_region(mem->start, resource_size(mem), pdev->name);
+	if (!mem) {
+		dev_err(&pdev->dev, "Failed to request mmio memory region\n");
+		ret = -EBUSY;
+		goto err_free_codec;
+	}
+
+	jz4740_codec->base = ioremap(mem->start, resource_size(mem));
+	if (!jz4740_codec->base) {
+		dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
+		ret = -EBUSY;
+		goto err_release_mem_region;
+	}
+	jz4740_codec->mem = mem;
+
+	jz4740_codec_dai.dev = &pdev->dev;
+
+	codec = &jz4740_codec->codec;
+
+	codec->dev		= &pdev->dev;
+	codec->name		= "jz4740";
+	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;
+	memcpy(codec->reg_cache, jz4740_codec_regs, sizeof(jz4740_codec_regs));
+
+	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(mem->start, resource_size(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);
+	struct resource *mem = jz4740_codec->mem;
+
+	snd_soc_unregister_dai(&jz4740_codec_dai);
+	snd_soc_unregister_codec(&jz4740_codec->codec);
+
+	iounmap(jz4740_codec->base);
+	release_mem_region(mem->start, resource_size(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@...afoo.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:jz4740-codec");
diff --git a/sound/soc/codecs/jz4740.h b/sound/soc/codecs/jz4740.h
new file mode 100644
index 0000000..b5a0691
--- /dev/null
+++ b/sound/soc/codecs/jz4740.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2009, Lars-Peter Clausen <lars@...afoo.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

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