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ASoC: Add utility to set a card's name from device tree 

Implement snd_soc_of_parse_card_name(), a utility function that sets a
card's name from device tree. The machine driver specifies the DT
property to use, since this is binding-specific.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Stephen Warren 2011-12-12 15:55:34 -07:00 committed by Mark Brown
parent 6048ef768e
commit bec4fa05e2
2 changed files with 28 additions and 0 deletions
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3
include/sound/soc.h
View File

@ -961,6 +961,9 @@ static inline bool snd_soc_volsw_is_stereo(struct soc_mixer_control *mc)
int snd_soc_util_init(void); int snd_soc_util_init(void);
void snd_soc_util_exit(void); void snd_soc_util_exit(void);
int snd_soc_of_parse_card_name(struct snd_soc_card *card,
const char *propname);
#include <sound/soc-dai.h> #include <sound/soc-dai.h>
#ifdef CONFIG_DEBUG_FS #ifdef CONFIG_DEBUG_FS

25
sound/soc/soc-core.c
View File

@ -32,6 +32,7 @@
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/ctype.h> #include <linux/ctype.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/of.h>
#include <sound/ac97_codec.h> #include <sound/ac97_codec.h>
#include <sound/core.h> #include <sound/core.h>
#include <sound/jack.h> #include <sound/jack.h>
@ -3317,6 +3318,30 @@ found:
} }
EXPORT_SYMBOL_GPL(snd_soc_unregister_codec); EXPORT_SYMBOL_GPL(snd_soc_unregister_codec);
/* Retrieve a card's name from device tree */
int snd_soc_of_parse_card_name(struct snd_soc_card *card,
const char *propname)
{
struct device_node *np = card->dev->of_node;
int ret;
ret = of_property_read_string_index(np, propname, 0, &card->name);
/*
* EINVAL means the property does not exist. This is fine providing
* card->name was previously set, which is checked later in
* snd_soc_register_card.
*/
if (ret < 0 && ret != -EINVAL) {
dev_err(card->dev,
"Property '%s' could not be read: %d\n",
propname, ret);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_of_parse_card_name);
static int __init snd_soc_init(void) static int __init snd_soc_init(void)
{ {
#ifdef CONFIG_DEBUG_FS #ifdef CONFIG_DEBUG_FS