1 files changed, 520 insertions, 0 deletions
diff --git a/sound/soc/codecs/si47xx.c b/sound/soc/codecs/si47xx.c
new file mode 100644
index 0000000..1012a3c
--- /dev/null
+++ b/sound/soc/codecs/si47xx.c
@@ -0,0 +1,520 @@
+/*
+ * FIXME: this is a blueprint for a Si47xx I2C driver
+ * it is based on the WM8728 driver and
+ * needs to be adapted for GTA04
+ *
+ * si47xx.c  --  Si47xx ALSA SoC Audio driver 
+ *
+ * Copyright 2008 Wolfson Microelectronics plc
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * 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/i2c.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.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>
+
+#include "si47xx.h"
+
+struct snd_soc_codec_device soc_codec_dev_si47xx;
+
+/*
+ * We can't read the WM8728 register space so we cache them instead.
+ * Note that the defaults here aren't the physical defaults, we latch
+ * the volume update bits, mute the output and enable infinite zero
+ * detect.
+ */
+static const u16 si47xx_reg_defaults[] = {
+	0x1ff,
+	0x1ff,
+	0x001,
+	0x100,
+};
+
+static const DECLARE_TLV_DB_SCALE(si47xx_tlv, -12750, 50, 1);
+
+static const struct snd_kcontrol_new si47xx_snd_controls[] = {
+
+SOC_DOUBLE_R_TLV("Digital Playback Volume", SI47XX_DACLVOL, SI47XX_DACRVOL,
+		 0, 255, 0, si47xx_tlv),
+
+SOC_SINGLE("Deemphasis", SI47XX_DACCTL, 1, 1, 0),
+};
+
+/*
+ * DAPM controls.
+ */
+static const struct snd_soc_dapm_widget si47xx_dapm_widgets[] = {
+SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
+SND_SOC_DAPM_OUTPUT("VOUTL"),
+SND_SOC_DAPM_OUTPUT("VOUTR"),
+};
+
+static const struct snd_soc_dapm_route intercon[] = {
+	{"VOUTL", NULL, "DAC"},
+	{"VOUTR", NULL, "DAC"},
+};
+
+static int si47xx_add_widgets(struct snd_soc_codec *codec)
+{
+	struct snd_soc_dapm_context *dapm = &codec->dapm;
+	snd_soc_dapm_new_controls(dapm, si47xx_dapm_widgets,
+				  ARRAY_SIZE(si47xx_dapm_widgets));
+
+	snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
+
+	return 0;
+}
+
+static int si47xx_mute(struct snd_soc_dai *dai, int mute)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	u16 mute_reg = snd_soc_read(codec, SI47XX_DACCTL);
+
+	if (mute)
+		snd_soc_write(codec, SI47XX_DACCTL, mute_reg | 1);
+	else
+		snd_soc_write(codec, SI47XX_DACCTL, mute_reg & ~1);
+
+	return 0;
+}
+
+static int si47xx_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_device *socdev = rtd->socdev;
+	struct snd_soc_codec *codec = socdev->card->codec;
+	u16 dac = snd_soc_read(codec, SI47XX_DACCTL);
+
+	dac &= ~0x18;
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		dac |= 0x10;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		dac |= 0x08;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	snd_soc_write(codec, SI47XX_DACCTL, dac);
+
+	return 0;
+}
+
+static int si47xx_set_dai_fmt(struct snd_soc_dai *codec_dai,
+		unsigned int fmt)
+{
+	struct snd_soc_codec *codec = codec_dai->codec;
+	u16 iface = snd_soc_read(codec, SI47XX_IFCTL);
+
+	/* Currently only I2S is supported by the driver, though the
+	 * hardware is more flexible.
+	 */
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		iface |= 1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* The hardware only support full slave mode */
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		iface &= ~0x22;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		iface |=  0x20;
+		iface &= ~0x02;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		iface |= 0x02;
+		iface &= ~0x20;
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		iface |= 0x22;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	snd_soc_write(codec, SI47XX_IFCTL, iface);
+	return 0;
+}
+
+static int si47xx_set_bias_level(struct snd_soc_codec *codec,
+				 enum snd_soc_bias_level level)
+{
+	u16 reg;
+	int i;
+
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+	case SND_SOC_BIAS_PREPARE:
+	case SND_SOC_BIAS_STANDBY:
+		if (codec->bias_level == SND_SOC_BIAS_OFF) {
+			/* Power everything up... */
+			reg = snd_soc_read(codec, SI47XX_DACCTL);
+			snd_soc_write(codec, SI47XX_DACCTL, reg & ~0x4);
+
+			/* ..then sync in the register cache. */
+			for (i = 0; i < ARRAY_SIZE(si47xx_reg_defaults); i++)
+				snd_soc_write(codec, i,
+					     snd_soc_read(codec, i));
+		}
+		break;
+
+	case SND_SOC_BIAS_OFF:
+		reg = snd_soc_read(codec, SI47XX_DACCTL);
+		snd_soc_write(codec, SI47XX_DACCTL, reg | 0x4);
+		break;
+	}
+	codec->bias_level = level;
+	return 0;
+}
+
+// FIXME: adjust what the Si47xx chip needs...
+
+#define SI47XX_RATES (SNDRV_PCM_RATE_8000_192000)
+
+#define SI47XX_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
+	SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_ops si47xx_dai_ops = {
+	.hw_params	= si47xx_hw_params,
+	.digital_mute	= si47xx_mute,
+	.set_fmt	= si47xx_set_dai_fmt,
+};
+
+struct snd_soc_dai si47xx_dai = {
+	.name = "Si47xx",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SI47XX_RATES,
+		.formats = SI47XX_FORMATS,
+	},
+	.playback = {
+		.stream_name = "Capture",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SI47XX_RATES,
+		.formats = SI47XX_FORMATS,
+	},
+	.ops = &si47xx_dai_ops,
+};
+EXPORT_SYMBOL_GPL(si47xx_dai);
+
+static int si47xx_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;
+
+	si47xx_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+	return 0;
+}
+
+static int si47xx_resume(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	si47xx_set_bias_level(codec, codec->suspend_bias_level);
+
+	return 0;
+}
+
+/*
+ * initialise the Si47xx driver
+ * register the mixer and dsp interfaces with the kernel
+ */
+static int si47xx_init(struct snd_soc_device *socdev,
+		       enum snd_soc_control_type control)
+{
+	struct snd_soc_codec *codec = socdev->card->codec;
+	int ret = 0;
+
+	codec->name = "Si47xx";
+	codec->owner = THIS_MODULE;
+	codec->set_bias_level = si47xx_set_bias_level;
+	codec->dai = &si47xx_dai;
+	codec->num_dai = 1;
+	codec->bias_level = SND_SOC_BIAS_OFF;
+	codec->reg_cache_size = ARRAY_SIZE(si47xx_reg_defaults);
+	codec->reg_cache = kmemdup(si47xx_reg_defaults,
+				   sizeof(si47xx_reg_defaults),
+				   GFP_KERNEL);
+	if (codec->reg_cache == NULL)
+		return -ENOMEM;
+
+	ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
+	if (ret < 0) {
+		printk(KERN_ERR "si47xx: failed to configure cache I/O: %d\n",
+		       ret);
+		goto err;
+	}
+
+	/* register pcms */
+	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+	if (ret < 0) {
+		printk(KERN_ERR "si47xx: failed to create pcms\n");
+		goto err;
+	}
+
+	/* power on device */
+	si47xx_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	snd_soc_add_controls(codec, si47xx_snd_controls,
+				ARRAY_SIZE(si47xx_snd_controls));
+	si47xx_add_widgets(codec);
+
+	return ret;
+
+err:
+	kfree(codec->reg_cache);
+	return ret;
+}
+
+static struct snd_soc_device *si47xx_socdev;
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+
+/*
+ * Si47xx 2 wire address is determined by GPIO5
+ * state during powerup.
+ *    low  = 0x1a
+ *    high = 0x1b
+ */
+
+static int si47xx_i2c_probe(struct i2c_client *i2c,
+			    const struct i2c_device_id *id)
+{
+	struct snd_soc_device *socdev = si47xx_socdev;
+	struct snd_soc_codec *codec = socdev->card->codec;
+	int ret;
+
+	i2c_set_clientdata(i2c, codec);
+	codec->control_data = i2c;
+
+	ret = si47xx_init(socdev, SND_SOC_I2C);
+	if (ret < 0)
+		pr_err("failed to initialise Si47xx\n");
+
+	return ret;
+}
+
+static int si47xx_i2c_remove(struct i2c_client *client)
+{
+	struct snd_soc_codec *codec = i2c_get_clientdata(client);
+	kfree(codec->reg_cache);
+	return 0;
+}
+
+static const struct i2c_device_id si47xx_i2c_id[] = {
+	{ "si47xx", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, si47xx_i2c_id);
+
+static struct i2c_driver si47xx_i2c_driver = {
+	.driver = {
+		.name = "Si47xx I2C Codec",
+		.owner = THIS_MODULE,
+	},
+	.probe =    si47xx_i2c_probe,
+	.remove =   si47xx_i2c_remove,
+	.id_table = si47xx_i2c_id,
+};
+
+static int si47xx_add_i2c_device(struct platform_device *pdev,
+				 const struct si47xx_setup_data *setup)
+{
+	struct i2c_board_info info;
+	struct i2c_adapter *adapter;
+	struct i2c_client *client;
+	int ret;
+
+	ret = i2c_add_driver(&si47xx_i2c_driver);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "can't add i2c driver\n");
+		return ret;
+	}
+
+	memset(&info, 0, sizeof(struct i2c_board_info));
+	info.addr = setup->i2c_address;
+	strlcpy(info.type, "si47xx", I2C_NAME_SIZE);
+
+	adapter = i2c_get_adapter(setup->i2c_bus);
+	if (!adapter) {
+		dev_err(&pdev->dev, "can't get i2c adapter %d\n",
+			setup->i2c_bus);
+		goto err_driver;
+	}
+
+	client = i2c_new_device(adapter, &info);
+	i2c_put_adapter(adapter);
+	if (!client) {
+		dev_err(&pdev->dev, "can't add i2c device at 0x%x\n",
+			(unsigned int)info.addr);
+		goto err_driver;
+	}
+
+	return 0;
+
+err_driver:
+	i2c_del_driver(&si47xx_i2c_driver);
+	return -ENODEV;
+}
+#endif
+
+#if defined(CONFIG_SPI_MASTER)
+static int __devinit si47xx_spi_probe(struct spi_device *spi)
+{
+	struct snd_soc_device *socdev = si47xx_socdev;
+	struct snd_soc_codec *codec = socdev->card->codec;
+	int ret;
+
+	codec->control_data = spi;
+
+	ret = si47xx_init(socdev, SND_SOC_SPI);
+	if (ret < 0)
+		dev_err(&spi->dev, "failed to initialise Si47xx\n");
+
+	return ret;
+}
+
+static int __devexit si47xx_spi_remove(struct spi_device *spi)
+{
+	return 0;
+}
+
+MODULE_ALIAS("platform:si47xx_codec_audio");
+
+static struct spi_driver si47xx_spi_driver = {
+	.driver = {
+		.name	= "si47xx_codec_audio",
+		.bus	= &spi_bus_type,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= si47xx_spi_probe,
+	.remove		= __devexit_p(si47xx_spi_remove),
+};
+#endif /* CONFIG_SPI_MASTER */
+
+static int si47xx_probe(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct si47xx_setup_data *setup;
+	struct snd_soc_codec *codec;
+	int ret = 0;
+
+	setup = socdev->codec_data;
+	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+	if (codec == NULL)
+		return -ENOMEM;
+
+	socdev->card->codec = codec;
+	mutex_init(&codec->mutex);
+	INIT_LIST_HEAD(&codec->dapm_widgets);
+	INIT_LIST_HEAD(&codec->dapm_paths);
+
+	si47xx_socdev = socdev;
+	ret = -ENODEV;
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	if (setup->i2c_address) {
+		ret = si47xx_add_i2c_device(pdev, setup);
+	}
+#endif
+#if defined(CONFIG_SPI_MASTER)
+	if (setup->spi) {
+		ret = spi_register_driver(&si47xx_spi_driver);
+		if (ret != 0)
+			printk(KERN_ERR "can't add spi driver");
+	}
+#endif
+
+	if (ret != 0)
+		kfree(codec);
+
+	return ret;
+}
+
+/* power down chip */
+static int si47xx_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	if (codec->control_data)
+		si47xx_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+	i2c_unregister_device(codec->control_data);
+	i2c_del_driver(&si47xx_i2c_driver);
+#endif
+#if defined(CONFIG_SPI_MASTER)
+	spi_unregister_driver(&si47xx_spi_driver);
+#endif
+	kfree(codec);
+
+	return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_si47xx = {
+	.probe = 	si47xx_probe,
+	.remove = 	si47xx_remove,
+	.suspend = 	si47xx_suspend,
+	.resume =	si47xx_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_si47xx);
+
+static int __init si47xx_modinit(void)
+{
+	return snd_soc_register_dai(&si47xx_dai);
+}
+module_init(si47xx_modinit);
+
+static void __exit si47xx_exit(void)
+{
+	snd_soc_unregister_dai(&si47xx_dai);
+}
+module_exit(si47xx_exit);
+
+MODULE_DESCRIPTION("ASoC Si47xx driver");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_LICENSE("GPL");