drivers/mfd/twl4030-audio.c - maze/linux - Git at Google

 /*
  * MFD driver for twl4030 audio submodule, which contains an audio codec, and
  * the vibra control.
  *
  * Author: Peter Ujfalusi <peter.ujfalusi@ti.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/of.h>
 #include <linux/of_platform.h>
 #include <linux/i2c/twl.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/twl4030-audio.h>

 #define TWL4030_AUDIO_CELLS	2

 static struct platform_device *twl4030_audio_dev;

 struct twl4030_audio_resource {
 	int request_count;
 	u8 reg;
 	u8 mask;
 };

 struct twl4030_audio {
 	unsigned int audio_mclk;
 	struct mutex mutex;
 	struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
 	struct mfd_cell cells[TWL4030_AUDIO_CELLS];
 };

 /*
  * Modify the resource, the function returns the content of the register
  * after the modification.
  */
 static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable)
 {
 	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
 	u8 val;

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

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

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

 	return val;
 }

 static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
 {
 	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
 	u8 val;

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

 	return val;
 }

 /*
  * Enable the resource.
  * The function returns with error or the content of the register
  */
 int twl4030_audio_enable_resource(enum twl4030_audio_res id)
 {
 	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
 	int val;

 	if (id >= TWL4030_AUDIO_RES_MAX) {
 		dev_err(&twl4030_audio_dev->dev,
 				"Invalid resource ID (%u)\n", id);
 		return -EINVAL;
 	}

 	mutex_lock(&audio->mutex);
 	if (!audio->resource[id].request_count)
 		/* Resource was disabled, enable it */
 		val = twl4030_audio_set_resource(id, 1);
 	else
 		val = twl4030_audio_get_resource(id);

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

 	return val;
 }
 EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource);

 /*
  * Disable the resource.
  * The function returns with error or the content of the register
  */
 int twl4030_audio_disable_resource(enum twl4030_audio_res id)
 {
 	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
 	int val;

 	if (id >= TWL4030_AUDIO_RES_MAX) {
 		dev_err(&twl4030_audio_dev->dev,
 				"Invalid resource ID (%u)\n", id);
 		return -EINVAL;
 	}

 	mutex_lock(&audio->mutex);
 	if (!audio->resource[id].request_count) {
 		dev_err(&twl4030_audio_dev->dev,
 			"Resource has been disabled already (%u)\n", id);
 		mutex_unlock(&audio->mutex);
 		return -EPERM;
 	}
 	audio->resource[id].request_count--;

 	if (!audio->resource[id].request_count)
 		/* Resource can be disabled now */
 		val = twl4030_audio_set_resource(id, 0);
 	else
 		val = twl4030_audio_get_resource(id);

 	mutex_unlock(&audio->mutex);

 	return val;
 }
 EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);

 unsigned int twl4030_audio_get_mclk(void)
 {
 	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);

 	return audio->audio_mclk;
 }
 EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);

 static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
 			      struct device_node *node)
 {
 	if (pdata && pdata->codec)
 		return true;

 	if (of_find_node_by_name(node, "codec"))
 		return true;

 	return false;
 }

 static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
 			      struct device_node *node)
 {
 	int vibra;

 	if (pdata && pdata->vibra)
 		return true;

 	if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
 		return true;

 	return false;
 }

 static int twl4030_audio_probe(struct platform_device *pdev)
 {
 	struct twl4030_audio *audio;
 	struct twl4030_audio_data *pdata = pdev->dev.platform_data;
 	struct device_node *node = pdev->dev.of_node;
 	struct mfd_cell *cell = NULL;
 	int ret, childs = 0;
 	u8 val;

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

 	audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
 			     GFP_KERNEL);
 	if (!audio)
 		return -ENOMEM;

 	mutex_init(&audio->mutex);
 	audio->audio_mclk = twl_get_hfclk_rate();

 	/* Configure APLL_INFREQ and disable APLL if enabled */
 	switch (audio->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 power */
 	audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
 	audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;

 	/* PLL */
 	audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
 	audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;

 	if (twl4030_audio_has_codec(pdata, node)) {
 		cell = &audio->cells[childs];
 		cell->name = "twl4030-codec";
 		if (pdata) {
 			cell->platform_data = pdata->codec;
 			cell->pdata_size = sizeof(*pdata->codec);
 		}
 		childs++;
 	}
 	if (twl4030_audio_has_vibra(pdata, node)) {
 		cell = &audio->cells[childs];
 		cell->name = "twl4030-vibra";
 		if (pdata) {
 			cell->platform_data = pdata->vibra;
 			cell->pdata_size = sizeof(*pdata->vibra);
 		}
 		childs++;
 	}

 	platform_set_drvdata(pdev, audio);
 	twl4030_audio_dev = pdev;

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

 	if (ret) {
 		platform_set_drvdata(pdev, NULL);
 		twl4030_audio_dev = NULL;
 	}

 	return ret;
 }

 static int twl4030_audio_remove(struct platform_device *pdev)
 {
 	mfd_remove_devices(&pdev->dev);
 	platform_set_drvdata(pdev, NULL);
 	twl4030_audio_dev = NULL;

 	return 0;
 }

 static const struct of_device_id twl4030_audio_of_match[] = {
 	{.compatible = "ti,twl4030-audio", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);

 static struct platform_driver twl4030_audio_driver = {
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= "twl4030-audio",
 		.of_match_table = twl4030_audio_of_match,
 	},
 	.probe		= twl4030_audio_probe,
 	.remove		= twl4030_audio_remove,
 };

 module_platform_driver(twl4030_audio_driver);

 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:twl4030-audio");
	/*
	* MFD driver for twl4030 audio submodule, which contains an audio codec, and
	* the vibra control.
	*
	* Author: Peter Ujfalusi <peter.ujfalusi@ti.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/of.h>
	#include <linux/of_platform.h>
	#include <linux/i2c/twl.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/twl4030-audio.h>

	#define TWL4030_AUDIO_CELLS 2

	static struct platform_device *twl4030_audio_dev;

	struct twl4030_audio_resource {
	int request_count;
	u8 reg;
	u8 mask;
	};

	struct twl4030_audio {
	unsigned int audio_mclk;
	struct mutex mutex;
	struct twl4030_audio_resource resource[TWL4030_AUDIO_RES_MAX];
	struct mfd_cell cells[TWL4030_AUDIO_CELLS];
	};

	/*
	* Modify the resource, the function returns the content of the register
	* after the modification.
	*/
	static int twl4030_audio_set_resource(enum twl4030_audio_res id, int enable)
	{
	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
	u8 val;

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

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

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

	return val;
	}

	static inline int twl4030_audio_get_resource(enum twl4030_audio_res id)
	{
	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
	u8 val;

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

	return val;
	}

	/*
	* Enable the resource.
	* The function returns with error or the content of the register
	*/
	int twl4030_audio_enable_resource(enum twl4030_audio_res id)
	{
	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
	int val;

	if (id >= TWL4030_AUDIO_RES_MAX) {
	dev_err(&twl4030_audio_dev->dev,
	"Invalid resource ID (%u)\n", id);
	return -EINVAL;
	}

	mutex_lock(&audio->mutex);
	if (!audio->resource[id].request_count)
	/* Resource was disabled, enable it */
	val = twl4030_audio_set_resource(id, 1);
	else
	val = twl4030_audio_get_resource(id);

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

	return val;
	}
	EXPORT_SYMBOL_GPL(twl4030_audio_enable_resource);

	/*
	* Disable the resource.
	* The function returns with error or the content of the register
	*/
	int twl4030_audio_disable_resource(enum twl4030_audio_res id)
	{
	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
	int val;

	if (id >= TWL4030_AUDIO_RES_MAX) {
	dev_err(&twl4030_audio_dev->dev,
	"Invalid resource ID (%u)\n", id);
	return -EINVAL;
	}

	mutex_lock(&audio->mutex);
	if (!audio->resource[id].request_count) {
	dev_err(&twl4030_audio_dev->dev,
	"Resource has been disabled already (%u)\n", id);
	mutex_unlock(&audio->mutex);
	return -EPERM;
	}
	audio->resource[id].request_count--;

	if (!audio->resource[id].request_count)
	/* Resource can be disabled now */
	val = twl4030_audio_set_resource(id, 0);
	else
	val = twl4030_audio_get_resource(id);

	mutex_unlock(&audio->mutex);

	return val;
	}
	EXPORT_SYMBOL_GPL(twl4030_audio_disable_resource);

	unsigned int twl4030_audio_get_mclk(void)
	{
	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);

	return audio->audio_mclk;
	}
	EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk);

	static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata,
	struct device_node *node)
	{
	if (pdata && pdata->codec)
	return true;

	if (of_find_node_by_name(node, "codec"))
	return true;

	return false;
	}

	static bool twl4030_audio_has_vibra(struct twl4030_audio_data *pdata,
	struct device_node *node)
	{
	int vibra;

	if (pdata && pdata->vibra)
	return true;

	if (!of_property_read_u32(node, "ti,enable-vibra", &vibra) && vibra)
	return true;

	return false;
	}

	static int twl4030_audio_probe(struct platform_device *pdev)
	{
	struct twl4030_audio *audio;
	struct twl4030_audio_data *pdata = pdev->dev.platform_data;
	struct device_node *node = pdev->dev.of_node;
	struct mfd_cell *cell = NULL;
	int ret, childs = 0;
	u8 val;

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

	audio = devm_kzalloc(&pdev->dev, sizeof(struct twl4030_audio),
	GFP_KERNEL);
	if (!audio)
	return -ENOMEM;

	mutex_init(&audio->mutex);
	audio->audio_mclk = twl_get_hfclk_rate();

	/* Configure APLL_INFREQ and disable APLL if enabled */
	switch (audio->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 power */
	audio->resource[TWL4030_AUDIO_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
	audio->resource[TWL4030_AUDIO_RES_POWER].mask = TWL4030_CODECPDZ;

	/* PLL */
	audio->resource[TWL4030_AUDIO_RES_APLL].reg = TWL4030_REG_APLL_CTL;
	audio->resource[TWL4030_AUDIO_RES_APLL].mask = TWL4030_APLL_EN;

	if (twl4030_audio_has_codec(pdata, node)) {
	cell = &audio->cells[childs];
	cell->name = "twl4030-codec";
	if (pdata) {
	cell->platform_data = pdata->codec;
	cell->pdata_size = sizeof(*pdata->codec);
	}
	childs++;
	}
	if (twl4030_audio_has_vibra(pdata, node)) {
	cell = &audio->cells[childs];
	cell->name = "twl4030-vibra";
	if (pdata) {
	cell->platform_data = pdata->vibra;
	cell->pdata_size = sizeof(*pdata->vibra);
	}
	childs++;
	}

	platform_set_drvdata(pdev, audio);
	twl4030_audio_dev = pdev;

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

	if (ret) {
	platform_set_drvdata(pdev, NULL);
	twl4030_audio_dev = NULL;
	}

	return ret;
	}

	static int twl4030_audio_remove(struct platform_device *pdev)
	{
	mfd_remove_devices(&pdev->dev);
	platform_set_drvdata(pdev, NULL);
	twl4030_audio_dev = NULL;

	return 0;
	}

	static const struct of_device_id twl4030_audio_of_match[] = {
	{.compatible = "ti,twl4030-audio", },
	{ },
	};
	MODULE_DEVICE_TABLE(of, twl4030_audio_of_match);

	static struct platform_driver twl4030_audio_driver = {
	.driver = {
	.owner = THIS_MODULE,
	.name = "twl4030-audio",
	.of_match_table = twl4030_audio_of_match,
	},
	.probe = twl4030_audio_probe,
	.remove = twl4030_audio_remove,
	};

	module_platform_driver(twl4030_audio_driver);

	MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
	MODULE_DESCRIPTION("TWL4030 audio block MFD driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:twl4030-audio");