/*
* 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/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_audio";
cell->platform_data = pdata->audio;
cell->data_size = sizeof(*pdata->audio);
childs++;
}
if (pdata->vibra) {
cell = &codec->cells[childs];
cell->name = "twl4030_codec_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_codec");
static struct platform_driver twl4030_codec_driver = {
.probe = twl4030_codec_probe,
.remove = __devexit_p(twl4030_codec_remove),
.driver = {
.owner = THIS_MODULE,
.name = "twl4030_codec",
},
};
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");
