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linux/drivers/mfd/twl4030-audio.c
Uwe Kleine-König e0191f305f mfd: twl4030-audio: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20231123165627.492259-19-u.kleine-koenig@pengutronix.de
Signed-off-by: Lee Jones <lee@kernel.org>
2023-12-07 13:50:28 +00:00

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6.6 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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
*/
#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/mfd/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 *parent)
{
struct device_node *node;
if (pdata && pdata->codec)
return true;
node = of_get_child_by_name(parent, "codec");
if (node) {
of_node_put(node);
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 = dev_get_platdata(&pdev->dev);
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)
twl4030_audio_dev = NULL;
return ret;
}
static void twl4030_audio_remove(struct platform_device *pdev)
{
mfd_remove_devices(&pdev->dev);
twl4030_audio_dev = NULL;
}
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 = {
.name = "twl4030-audio",
.of_match_table = twl4030_audio_of_match,
},
.probe = twl4030_audio_probe,
.remove_new = 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_ALIAS("platform:twl4030-audio");
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