[linux.git] / drivers / mfd / twl4030-codec.c

/*
 * MFD driver for twl4030 audio submodule, which contains an audio codec, and
 * the vibra control.
 *
 * Author: Peter Ujfalusi <[email protected]>
 *
 * 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_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_CODEC_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_codec_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_codec_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_codec_enable_resource(enum twl4030_codec_res id)
{
	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
	int val;

	if (id >= TWL4030_CODEC_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_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_audio *audio = platform_get_drvdata(twl4030_audio_dev);
	int val;

	if (id >= TWL4030_CODEC_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_codec_disable_resource);

unsigned int twl4030_codec_get_mclk(void)
{
	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);

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

static int __devinit twl4030_audio_probe(struct platform_device *pdev)
{
	struct twl4030_audio *audio;
	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);

	audio = kzalloc(sizeof(struct twl4030_audio), GFP_KERNEL);
	if (!audio)
		return -ENOMEM;

	platform_set_drvdata(pdev, audio);

	twl4030_audio_dev = pdev;
	mutex_init(&audio->mutex);
	audio->audio_mclk = pdata->audio_mclk;

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

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

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

	if (childs)
		ret = mfd_add_devices(&pdev->dev, pdev->id, audio->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(audio);
	twl4030_audio_dev = NULL;
	return ret;
}

static int __devexit twl4030_audio_remove(struct platform_device *pdev)
{
	struct twl4030_audio *audio = platform_get_drvdata(pdev);

	mfd_remove_devices(&pdev->dev);
	platform_set_drvdata(pdev, NULL);
	kfree(audio);
	twl4030_audio_dev = NULL;

	return 0;
}

MODULE_ALIAS("platform:twl4030-audio");

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

static int __devinit twl4030_audio_init(void)
{
	return platform_driver_register(&twl4030_audio_driver);
}
module_init(twl4030_audio_init);

static void __devexit twl4030_audio_exit(void)
{
	platform_driver_unregister(&twl4030_audio_driver);
}
module_exit(twl4030_audio_exit);

MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
MODULE_LICENSE("GPL");
Commit	Line	Data
0b83ddeb	1	/*
4fe5668b PU	2	* MFD driver for twl4030 audio submodule, which contains an audio codec, and
4fe5668b PU	3	* the vibra control.
0b83ddeb	4	*
4a7c00cd	5	* Author: Peter Ujfalusi <[email protected]>
0b83ddeb PU	6	*
	7	* Copyright: (C) 2009 Nokia Corporation
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	21	* 02110-1301 USA
	22	*
	23	*/
	24
	25	#include <linux/module.h>
	26	#include <linux/types.h>
5a0e3ad6	27	#include <linux/slab.h>
0b83ddeb PU	28	#include <linux/kernel.h>
	29	#include <linux/fs.h>
	30	#include <linux/platform_device.h>
8bea8672	31	#include <linux/i2c/twl.h>
0b83ddeb PU	32	#include <linux/mfd/core.h>
	33	#include <linux/mfd/twl4030-codec.h>
	34
4fe5668b	35	#define TWL4030_AUDIO_CELLS 2
0b83ddeb	36
4fe5668b	37	static struct platform_device *twl4030_audio_dev;
0b83ddeb	38
4fe5668b	39	struct twl4030_audio_resource {
0b83ddeb PU	40	int request_count;
	41	u8 reg;
	42	u8 mask;
	43	};
	44
4fe5668b	45	struct twl4030_audio {
f9b4639e	46	unsigned int audio_mclk;
0b83ddeb	47	struct mutex mutex;
4fe5668b PU	48	struct twl4030_audio_resource resource[TWL4030_CODEC_RES_MAX];
4fe5668b PU	49	struct mfd_cell cells[TWL4030_AUDIO_CELLS];
0b83ddeb PU	50	};
	51
	52	/*
	53	* Modify the resource, the function returns the content of the register
	54	* after the modification.
	55	*/
4fe5668b	56	static int twl4030_audio_set_resource(enum twl4030_codec_res id, int enable)
0b83ddeb	57	{
4fe5668b	58	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
0b83ddeb PU	59	u8 val;
0b83ddeb PU	60
8bea8672	61	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
4fe5668b	62	audio->resource[id].reg);
0b83ddeb PU	63
0b83ddeb PU	64	if (enable)
4fe5668b	65	val \|= audio->resource[id].mask;
0b83ddeb	66	else
4fe5668b	67	val &= ~audio->resource[id].mask;
0b83ddeb	68
8bea8672	69	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
4fe5668b	70	val, audio->resource[id].reg);
0b83ddeb PU	71
	72	return val;
	73	}
	74
4fe5668b	75	static inline int twl4030_audio_get_resource(enum twl4030_codec_res id)
0b83ddeb	76	{
4fe5668b	77	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
0b83ddeb PU	78	u8 val;
0b83ddeb PU	79
8bea8672	80	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &val,
4fe5668b	81	audio->resource[id].reg);
0b83ddeb PU	82
	83	return val;
	84	}
	85
	86	/*
	87	* Enable the resource.
	88	* The function returns with error or the content of the register
	89	*/
	90	int twl4030_codec_enable_resource(enum twl4030_codec_res id)
	91	{
4fe5668b	92	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
0b83ddeb PU	93	int val;
	94
	95	if (id >= TWL4030_CODEC_RES_MAX) {
4fe5668b	96	dev_err(&twl4030_audio_dev->dev,
0b83ddeb PU	97	"Invalid resource ID (%u)\n", id);
	98	return -EINVAL;
	99	}
	100
4fe5668b PU	101	mutex_lock(&audio->mutex);
4fe5668b PU	102	if (!audio->resource[id].request_count)
0b83ddeb	103	/* Resource was disabled, enable it */
4fe5668b	104	val = twl4030_audio_set_resource(id, 1);
0b83ddeb	105	else
4fe5668b	106	val = twl4030_audio_get_resource(id);
0b83ddeb	107
4fe5668b PU	108	audio->resource[id].request_count++;
4fe5668b PU	109	mutex_unlock(&audio->mutex);
0b83ddeb PU	110
	111	return val;
	112	}
	113	EXPORT_SYMBOL_GPL(twl4030_codec_enable_resource);
	114
	115	/*
	116	* Disable the resource.
	117	* The function returns with error or the content of the register
	118	*/
	119	int twl4030_codec_disable_resource(unsigned id)
	120	{
4fe5668b	121	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
0b83ddeb PU	122	int val;
	123
	124	if (id >= TWL4030_CODEC_RES_MAX) {
4fe5668b	125	dev_err(&twl4030_audio_dev->dev,
0b83ddeb PU	126	"Invalid resource ID (%u)\n", id);
	127	return -EINVAL;
	128	}
	129
4fe5668b PU	130	mutex_lock(&audio->mutex);
	131	if (!audio->resource[id].request_count) {
	132	dev_err(&twl4030_audio_dev->dev,
0b83ddeb	133	"Resource has been disabled already (%u)\n", id);
4fe5668b	134	mutex_unlock(&audio->mutex);
0b83ddeb PU	135	return -EPERM;
0b83ddeb PU	136	}
4fe5668b	137	audio->resource[id].request_count--;
0b83ddeb	138
4fe5668b	139	if (!audio->resource[id].request_count)
0b83ddeb	140	/* Resource can be disabled now */
4fe5668b	141	val = twl4030_audio_set_resource(id, 0);
0b83ddeb	142	else
4fe5668b	143	val = twl4030_audio_get_resource(id);
0b83ddeb	144
4fe5668b	145	mutex_unlock(&audio->mutex);
0b83ddeb PU	146
	147	return val;
	148	}
	149	EXPORT_SYMBOL_GPL(twl4030_codec_disable_resource);
	150
f9b4639e PU	151	unsigned int twl4030_codec_get_mclk(void)
f9b4639e PU	152	{
4fe5668b	153	struct twl4030_audio *audio = platform_get_drvdata(twl4030_audio_dev);
f9b4639e	154
4fe5668b	155	return audio->audio_mclk;
f9b4639e PU	156	}
	157	EXPORT_SYMBOL_GPL(twl4030_codec_get_mclk);
	158
4fe5668b	159	static int __devinit twl4030_audio_probe(struct platform_device *pdev)
0b83ddeb	160	{
4fe5668b	161	struct twl4030_audio *audio;
0b83ddeb PU	162	struct twl4030_codec_data *pdata = pdev->dev.platform_data;
	163	struct mfd_cell *cell = NULL;
	164	int ret, childs = 0;
f9b4639e PU	165	u8 val;
	166
	167	if (!pdata) {
	168	dev_err(&pdev->dev, "Platform data is missing\n");
	169	return -EINVAL;
	170	}
	171
	172	/* Configure APLL_INFREQ and disable APLL if enabled */
	173	val = 0;
	174	switch (pdata->audio_mclk) {
	175	case 19200000:
	176	val \|= TWL4030_APLL_INFREQ_19200KHZ;
	177	break;
	178	case 26000000:
	179	val \|= TWL4030_APLL_INFREQ_26000KHZ;
	180	break;
	181	case 38400000:
	182	val \|= TWL4030_APLL_INFREQ_38400KHZ;
	183	break;
	184	default:
	185	dev_err(&pdev->dev, "Invalid audio_mclk\n");
	186	return -EINVAL;
	187	}
8bea8672	188	twl_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE,
f9b4639e	189	val, TWL4030_REG_APLL_CTL);
0b83ddeb	190
4fe5668b PU	191	audio = kzalloc(sizeof(struct twl4030_audio), GFP_KERNEL);
4fe5668b PU	192	if (!audio)
0b83ddeb PU	193	return -ENOMEM;
0b83ddeb PU	194
4fe5668b	195	platform_set_drvdata(pdev, audio);
0b83ddeb	196
4fe5668b PU	197	twl4030_audio_dev = pdev;
	198	mutex_init(&audio->mutex);
	199	audio->audio_mclk = pdata->audio_mclk;
0b83ddeb PU	200
0b83ddeb PU	201	/* Codec power */
4fe5668b PU	202	audio->resource[TWL4030_CODEC_RES_POWER].reg = TWL4030_REG_CODEC_MODE;
4fe5668b PU	203	audio->resource[TWL4030_CODEC_RES_POWER].mask = TWL4030_CODECPDZ;
0b83ddeb PU	204
0b83ddeb PU	205	/* PLL */
4fe5668b PU	206	audio->resource[TWL4030_CODEC_RES_APLL].reg = TWL4030_REG_APLL_CTL;
4fe5668b PU	207	audio->resource[TWL4030_CODEC_RES_APLL].mask = TWL4030_APLL_EN;
0b83ddeb PU	208
0b83ddeb PU	209	if (pdata->audio) {
4fe5668b	210	cell = &audio->cells[childs];
f0fba2ad	211	cell->name = "twl4030-codec";
a4579ad2 SO	212	cell->platform_data = pdata->audio;
a4579ad2 SO	213	cell->pdata_size = sizeof(*pdata->audio);
0b83ddeb PU	214	childs++;
	215	}
	216	if (pdata->vibra) {
4fe5668b	217	cell = &audio->cells[childs];
f0fba2ad	218	cell->name = "twl4030-vibra";
a4579ad2 SO	219	cell->platform_data = pdata->vibra;
a4579ad2 SO	220	cell->pdata_size = sizeof(*pdata->vibra);
0b83ddeb PU	221	childs++;
	222	}
	223
	224	if (childs)
4fe5668b	225	ret = mfd_add_devices(&pdev->dev, pdev->id, audio->cells,
0b83ddeb PU	226	childs, NULL, 0);
	227	else {
	228	dev_err(&pdev->dev, "No platform data found for childs\n");
	229	ret = -ENODEV;
	230	}
	231
	232	if (!ret)
	233	return 0;
	234
	235	platform_set_drvdata(pdev, NULL);
4fe5668b PU	236	kfree(audio);
4fe5668b PU	237	twl4030_audio_dev = NULL;
0b83ddeb PU	238	return ret;
	239	}
	240
4fe5668b	241	static int __devexit twl4030_audio_remove(struct platform_device *pdev)
0b83ddeb	242	{
4fe5668b	243	struct twl4030_audio *audio = platform_get_drvdata(pdev);
0b83ddeb PU	244
	245	mfd_remove_devices(&pdev->dev);
	246	platform_set_drvdata(pdev, NULL);
4fe5668b PU	247	kfree(audio);
4fe5668b PU	248	twl4030_audio_dev = NULL;
0b83ddeb PU	249
	250	return 0;
	251	}
	252
f0fba2ad	253	MODULE_ALIAS("platform:twl4030-audio");
0b83ddeb	254
4fe5668b PU	255	static struct platform_driver twl4030_audio_driver = {
	256	.probe = twl4030_audio_probe,
	257	.remove = __devexit_p(twl4030_audio_remove),
0b83ddeb PU	258	.driver = {
0b83ddeb PU	259	.owner = THIS_MODULE,
f0fba2ad	260	.name = "twl4030-audio",
0b83ddeb PU	261	},
	262	};
	263
4fe5668b	264	static int __devinit twl4030_audio_init(void)
0b83ddeb	265	{
4fe5668b	266	return platform_driver_register(&twl4030_audio_driver);
0b83ddeb	267	}
4fe5668b	268	module_init(twl4030_audio_init);
0b83ddeb	269
4fe5668b	270	static void __devexit twl4030_audio_exit(void)
0b83ddeb	271	{
4fe5668b	272	platform_driver_unregister(&twl4030_audio_driver);
0b83ddeb	273	}
4fe5668b	274	module_exit(twl4030_audio_exit);
0b83ddeb	275
4a7c00cd	276	MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
0b83ddeb PU	277	MODULE_LICENSE("GPL");
0b83ddeb PU	278