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linux/drivers/mfd/twl4030-audio.c
Peter Ujfalusi 019a7e6b7b mfd: twl4030-audio: Add DT support 
Support for loading the twl4030 audio module via devicetree.
Sub devices for codec and vibra will be created as mfd devices once the
core MFD driver is loaded when the kernel is booted with a DT blob.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-09-18 15:45:05 +02:00

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/*
* 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(unsigned 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 __devinit 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 __devexit 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 = __devexit_p(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");
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