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ASoC: ac97: Add support for resetting device before registration

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AC97 devices need to be initially reset before they can be used. Currently
each driver does this on its own.

Add support for resetting the device to core in snd_soc_new_ac97_codec().
If the caller supplies a device ID and device ID mask the function will
reset the device and verify that it has the correct ID, if it does not a
error is returned.

This will allow to remove custom code with similar functionality from
individual drivers.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2015-07-21 21:53:01 +02:00 committed by Mark Brown
parent 5f1d980ee9
commit 7361fbeaea
4 changed files with 29 additions and 8 deletions
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3
include/sound/soc.h
View File

@ -526,7 +526,8 @@ int snd_soc_test_bits(struct snd_soc_codec *codec, unsigned int reg,
#ifdef CONFIG_SND_SOC_AC97_BUS
struct snd_ac97 *snd_soc_alloc_ac97_codec(struct snd_soc_codec *codec);
struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec);
struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
unsigned int id, unsigned int id_mask);
void snd_soc_free_ac97_codec(struct snd_ac97 *ac97);
int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops);

2
sound/soc/codecs/ad1980.c
View File

@ -240,7 +240,7 @@ static int ad1980_soc_probe(struct snd_soc_codec *codec)
u16 vendor_id2;
u16 ext_status;
ac97 = snd_soc_new_ac97_codec(codec);
ac97 = snd_soc_new_ac97_codec(codec, 0, 0);
if (IS_ERR(ac97)) {
ret = PTR_ERR(ac97);
dev_err(codec->dev, "Failed to register AC97 codec: %d\n", ret);

2
sound/soc/codecs/stac9766.c
View File

@ -332,7 +332,7 @@ static int stac9766_codec_probe(struct snd_soc_codec *codec)
struct snd_ac97 *ac97;
int ret = 0;
ac97 = snd_soc_new_ac97_codec(codec);
ac97 = snd_soc_new_ac97_codec(codec, 0, 0);
if (IS_ERR(ac97))
return PTR_ERR(ac97);

30
sound/soc/soc-ac97.c
View File

@ -85,10 +85,19 @@ EXPORT_SYMBOL(snd_soc_alloc_ac97_codec);
/**
* snd_soc_new_ac97_codec - initailise AC97 device
* @codec: audio codec
* @id: The expected device ID
* @id_mask: Mask that is applied to the device ID before comparing with @id
*
* Initialises AC97 codec resources for use by ad-hoc devices only.
*
* If @id is not 0 this function will reset the device, then read the ID from
* the device and check if it matches the expected ID. If it doesn't match an
* error will be returned and device will not be registered.
*
* Returns: A PTR_ERR() on failure or a valid snd_ac97 struct on success.
*/
struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec)
struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec,
unsigned int id, unsigned int id_mask)
{
struct snd_ac97 *ac97;
int ret;
@ -97,13 +106,24 @@ struct snd_ac97 *snd_soc_new_ac97_codec(struct snd_soc_codec *codec)
if (IS_ERR(ac97))
return ac97;
ret = device_add(&ac97->dev);
if (ret) {
put_device(&ac97->dev);
return ERR_PTR(ret);
if (id) {
ret = snd_ac97_reset(ac97, false, id, id_mask);
if (ret < 0) {
dev_err(codec->dev, "Failed to reset AC97 device: %d\n",
ret);
goto err_put_device;
}
}
ret = device_add(&ac97->dev);
if (ret)
goto err_put_device;
return ac97;
err_put_device:
put_device(&ac97->dev);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(snd_soc_new_ac97_codec);