drivers/mfd/twl4030-codec.c - kernel/msm-4.9 - Gitiles

 /*
  * MFD driver for twl4030 codec submodule
  *
  * Author:	Peter Ujfalusi <peter.ujfalusi@nokia.com>
  *
  * Copyright:   (C) 2009 Nokia Corporation
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * 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., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/fs.h>
 #include <linux/platform_device.h>
 #include <linux/i2c/twl.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/twl4030-codec.h>

 #define TWL4030_CODEC_CELLS	2

 static struct platform_device *twl4030_codec_dev;

 struct twl4030_codec_resource {
 	int request_count;
 	u8 reg;
 	u8 mask;
 };

 struct twl4030_codec {
 	unsigned int audio_mclk;
 	struct mutex mutex;
 	struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
 	struct mfd_cell cells[TWL4030_CODEC_CELLS];
 };

 /*
  * Modify the resource, the function returns the content of the register
  * after the modification.
  */
 static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
 {
 	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
 	u8 val;

 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
 			codec->resource[id].reg);

 	if (enable)
 		val |= codec->resource[id].mask;
 	else
 		val &= ~codec->resource[id].mask;

 	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 					val, codec->resource[id].reg);

 	return val;
 }

 static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
 {
 	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
 	u8 val;

 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
 			codec->resource[id].reg);

 	return val;
 }

 /*
  * Enable the resource.
  * The function returns with error or the content of the register
  */
 int twl4030_codec_enable_resource(enum twl4030_codec_res id)
 {
 	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
 	int val;

 	if (id >= TWL4030_CODEC_RES_MAX) {
 		dev_err(&twl4030_codec_dev->dev,
 				"Invalid resource ID (%u)\n", id);
 		return -EINVAL;
 	}

 	mutex_lock(&codec->mutex);
 	if (!codec->resource[id].request_count)
 		/* Resource was disabled, enable it */
 		val = twl4030_codec_set_resource(id, 1);
 	else
 		val = twl4030_codec_get_resource(id);

 	codec->resource[id].request_count++;
 	mutex_unlock(&codec->mutex);

 	return val;
 }
 EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);

 /*
  * Disable the resource.
  * The function returns with error or the content of the register
  */
 int twl4030_codec_disable_resource(unsigned id)
 {
 	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
 	int val;

 	if (id >= TWL4030_CODEC_RES_MAX) {
 		dev_err(&twl4030_codec_dev->dev,
 				"Invalid resource ID (%u)\n", id);
 		return -EINVAL;
 	}

 	mutex_lock(&codec->mutex);
 	if (!codec->resource[id].request_count) {
 		dev_err(&twl4030_codec_dev->dev,
 			"Resource has been disabled already (%u)\n", id);
 		mutex_unlock(&codec->mutex);
 		return -EPERM;
 	}
 	codec->resource[id].request_count--;

 	if (!codec->resource[id].request_count)
 		/* Resource can be disabled now */
 		val = twl4030_codec_set_resource(id, 0);
 	else
 		val = twl4030_codec_get_resource(id);

 	mutex_unlock(&codec->mutex);

 	return val;
 }
 EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);

 unsigned int twl4030_codec_get_mclk(void)
 {
 	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);

 	return codec->audio_mclk;
 }
 EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);

 static int __devinit twl4030_codec_probe(struct platform_device *pdev)
 {
 	struct twl4030_codec *codec;
 	struct twl4030_codec_data *pdata = pdev->dev.platform_data;
 	struct mfd_cell *cell = NULL;
 	int ret, childs = 0;
 	u8 val;

 	if (!pdata) {
 		dev_err(&pdev->dev, "Platform data is missing\n");
 		return -EINVAL;
 	}

 	/* Configure APLL_INFREQ and disable APLL if enabled */
 	val = 0;
 	switch (pdata->audio_mclk) {
 	case 19200000:
 		val |= TWL4030_APLL_INFREQ_19200KHZ;
 		break;
 	case 26000000:
 		val |= TWL4030_APLL_INFREQ_26000KHZ;
 		break;
 	case 38400000:
 		val |= TWL4030_APLL_INFREQ_38400KHZ;
 		break;
 	default:
 		dev_err(&pdev->dev, "Invalid audio_mclk\n");
 		return -EINVAL;
 	}
 	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
 					val, TWL4030_REG_APLL_CTL);

 	codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
 	if (!codec)
 		return -ENOMEM;

 	platform_set_drvdata(pdev, codec);

 	twl4030_codec_dev = pdev;
 	mutex_init(&codec->mutex);
 	codec->audio_mclk = pdata->audio_mclk;

 	/* Codec power */
 	codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
 	codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;

 	/* PLL */
 	codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
 	codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;

 	if (pdata->audio) {
 		cell = &codec->cells[childs];
 		cell->name = "twl4030-codec";
 		cell->platform_data = pdata->audio;
 		cell->data_size = sizeof(*pdata->audio);
 		childs++;
 	}
 	if (pdata->vibra) {
 		cell = &codec->cells[childs];
 		cell->name = "twl4030-vibra";
 		cell->platform_data = pdata->vibra;
 		cell->data_size = sizeof(*pdata->vibra);
 		childs++;
 	}

 	if (childs)
 		ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
 				      childs, NULL, 0);
 	else {
 		dev_err(&pdev->dev, "No platform data found for childs\n");
 		ret = -ENODEV;
 	}

 	if (!ret)
 		return 0;

 	platform_set_drvdata(pdev, NULL);
 	kfree(codec);
 	twl4030_codec_dev = NULL;
 	return ret;
 }

 static int __devexit twl4030_codec_remove(struct platform_device *pdev)
 {
 	struct twl4030_codec *codec = platform_get_drvdata(pdev);

 	mfd_remove_devices(&pdev->dev);
 	platform_set_drvdata(pdev, NULL);
 	kfree(codec);
 	twl4030_codec_dev = NULL;

 	return 0;
 }

 MODULE_ALIAS("platform:twl4030-audio");

 static struct platform_driver twl4030_codec_driver = {
 	.probe		= twl4030_codec_probe,
 	.remove		= __devexit_p(twl4030_codec_remove),
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= "twl4030-audio",
 	},
 };

 static int __devinit twl4030_codec_init(void)
 {
 	return platform_driver_register(&twl4030_codec_driver);
 }
 module_init(twl4030_codec_init);

 static void __devexit twl4030_codec_exit(void)
 {
 	platform_driver_unregister(&twl4030_codec_driver);
 }
 module_exit(twl4030_codec_exit);

 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
 MODULE_LICENSE("GPL");
	/*
	* MFD driver for twl4030 codec submodule
	*
	* Author: Peter Ujfalusi <peter.ujfalusi@nokia.com>
	*
	* Copyright: (C) 2009 Nokia Corporation
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* 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., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/slab.h>
	#include <linux/kernel.h>
	#include <linux/fs.h>
	#include <linux/platform_device.h>
	#include <linux/i2c/twl.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/twl4030-codec.h>

	#define TWL4030_CODEC_CELLS 2

	static struct platform_device *twl4030_codec_dev;

	struct twl4030_codec_resource {
	int request_count;
	u8 reg;
	u8 mask;
	};

	struct twl4030_codec {
	unsigned int audio_mclk;
	struct mutex mutex;
	struct twl4030_codec_resource resource[TWL4030_CODEC_RES_MAX];
	struct mfd_cell cells[TWL4030_CODEC_CELLS];
	};

	/*
	* Modify the resource, the function returns the content of the register
	* after the modification.
	*/
	static int twl4030_codec_set_resource(enum twl4030_codec_res id, int enable)
	{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
	u8 val;

	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
	codec->resource[id].reg);

	if (enable)
	val \|= codec->resource[id].mask;
	else
	val &= ~codec->resource[id].mask;

	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
	val, codec->resource[id].reg);

	return val;
	}

	static inline int twl4030_codec_get_resource(enum twl4030_codec_res id)
	{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
	u8 val;

	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
	codec->resource[id].reg);

	return val;
	}

	/*
	* Enable the resource.
	* The function returns with error or the content of the register
	*/
	int twl4030_codec_enable_resource(enum twl4030_codec_res id)
	{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
	int val;

	if (id >= TWL4030_CODEC_RES_MAX) {
	dev_err(&twl4030_codec_dev->dev,
	"Invalid resource ID (%u)\n", id);
	return -EINVAL;
	}

	mutex_lock(&codec->mutex);
	if (!codec->resource[id].request_count)
	/* Resource was disabled, enable it */
	val = twl4030_codec_set_resource(id, 1);
	else
	val = twl4030_codec_get_resource(id);

	codec->resource[id].request_count++;
	mutex_unlock(&codec->mutex);

	return val;
	}
	EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);

	/*
	* Disable the resource.
	* The function returns with error or the content of the register
	*/
	int twl4030_codec_disable_resource(unsigned id)
	{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);
	int val;

	if (id >= TWL4030_CODEC_RES_MAX) {
	dev_err(&twl4030_codec_dev->dev,
	"Invalid resource ID (%u)\n", id);
	return -EINVAL;
	}

	mutex_lock(&codec->mutex);
	if (!codec->resource[id].request_count) {
	dev_err(&twl4030_codec_dev->dev,
	"Resource has been disabled already (%u)\n", id);
	mutex_unlock(&codec->mutex);
	return -EPERM;
	}
	codec->resource[id].request_count--;

	if (!codec->resource[id].request_count)
	/* Resource can be disabled now */
	val = twl4030_codec_set_resource(id, 0);
	else
	val = twl4030_codec_get_resource(id);

	mutex_unlock(&codec->mutex);

	return val;
	}
	EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);

	unsigned int twl4030_codec_get_mclk(void)
	{
	struct twl4030_codec *codec = platform_get_drvdata(twl4030_codec_dev);

	return codec->audio_mclk;
	}
	EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);

	static int __devinit twl4030_codec_probe(struct platform_device *pdev)
	{
	struct twl4030_codec *codec;
	struct twl4030_codec_data *pdata = pdev->dev.platform_data;
	struct mfd_cell *cell = NULL;
	int ret, childs = 0;
	u8 val;

	if (!pdata) {
	dev_err(&pdev->dev, "Platform data is missing\n");
	return -EINVAL;
	}

	/* Configure APLL_INFREQ and disable APLL if enabled */
	val = 0;
	switch (pdata->audio_mclk) {
	case 19200000:
	val \|= TWL4030_APLL_INFREQ_19200KHZ;
	break;
	case 26000000:
	val \|= TWL4030_APLL_INFREQ_26000KHZ;
	break;
	case 38400000:
	val \|= TWL4030_APLL_INFREQ_38400KHZ;
	break;
	default:
	dev_err(&pdev->dev, "Invalid audio_mclk\n");
	return -EINVAL;
	}
	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
	val, TWL4030_REG_APLL_CTL);

	codec = kzalloc(sizeof(struct twl4030_codec), GFP_KERNEL);
	if (!codec)
	return -ENOMEM;

	platform_set_drvdata(pdev, codec);

	twl4030_codec_dev = pdev;
	mutex_init(&codec->mutex);
	codec->audio_mclk = pdata->audio_mclk;

	/* Codec power */
	codec->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
	codec->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;

	/* PLL */
	codec->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
	codec->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;

	if (pdata->audio) {
	cell = &codec->cells[childs];
	cell->name = "twl4030-codec";
	cell->platform_data = pdata->audio;
	cell->data_size = sizeof(*pdata->audio);
	childs++;
	}
	if (pdata->vibra) {
	cell = &codec->cells[childs];
	cell->name = "twl4030-vibra";
	cell->platform_data = pdata->vibra;
	cell->data_size = sizeof(*pdata->vibra);
	childs++;
	}

	if (childs)
	ret = mfd_add_devices(&pdev->dev, pdev->id, codec->cells,
	childs, NULL, 0);
	else {
	dev_err(&pdev->dev, "No platform data found for childs\n");
	ret = -ENODEV;
	}

	if (!ret)
	return 0;

	platform_set_drvdata(pdev, NULL);
	kfree(codec);
	twl4030_codec_dev = NULL;
	return ret;
	}

	static int __devexit twl4030_codec_remove(struct platform_device *pdev)
	{
	struct twl4030_codec *codec = platform_get_drvdata(pdev);

	mfd_remove_devices(&pdev->dev);
	platform_set_drvdata(pdev, NULL);
	kfree(codec);
	twl4030_codec_dev = NULL;

	return 0;
	}

	MODULE_ALIAS("platform:twl4030-audio");

	static struct platform_driver twl4030_codec_driver = {
	.probe = twl4030_codec_probe,
	.remove = __devexit_p(twl4030_codec_remove),
	.driver = {
	.owner = THIS_MODULE,
	.name = "twl4030-audio",
	},
	};

	static int __devinit twl4030_codec_init(void)
	{
	return platform_driver_register(&twl4030_codec_driver);
	}
	module_init(twl4030_codec_init);

	static void __devexit twl4030_codec_exit(void)
	{
	platform_driver_unregister(&twl4030_codec_driver);
	}
	module_exit(twl4030_codec_exit);

	MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
	MODULE_LICENSE("GPL");