diff options
| author | Stephen Warren <swarren@nvidia.com> | 2011-12-12 15:55:34 -0700 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-12-20 01:05:34 +0000 |
| commit | bec4fa05e25f7e78ec67df389539acc6bb352a2a (patch) | |
| tree | ddde93b4ca9604bf586bde2381cdb8c0dffd3f07 | |
| parent | 6048ef768e7bec7e1e17f48fe8d5360021928b4a (diff) | |
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>
| -rw-r--r-- | include/sound/soc.h | 3 | ||||
| -rw-r--r-- | sound/soc/soc-core.c | 25 |
2 files changed, 28 insertions, 0 deletions
diff --git a/include/sound/soc.h b/include/sound/soc.h index a35cf14a8eb..278f3b892ca 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -961,6 +961,9 @@ static inline bool snd_soc_volsw_is_stereo(struct soc_mixer_control *mc) int snd_soc_util_init(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> #ifdef CONFIG_DEBUG_FS diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 1252ab1ebf6..51eef9b7b53 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -32,6 +32,7 @@ #include <linux/platform_device.h> #include <linux/ctype.h> #include <linux/slab.h> +#include <linux/of.h> #include <sound/ac97_codec.h> #include <sound/core.h> #include <sound/jack.h> @@ -3317,6 +3318,30 @@ found: } 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) { #ifdef CONFIG_DEBUG_FS |