diff options
| author | Stephen Warren <swarren@nvidia.com> | 2011-12-12 15:55:35 -0700 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-12-20 01:05:34 +0000 |
| commit | a4a54dd5bb1bb01010f46147d6d8b452255957bf (patch) | |
| tree | f4f101cd8ceb909c32ebc0c6112446d2f483327d /sound/soc/soc-core.c | |
| parent | bec4fa05e25f7e78ec67df389539acc6bb352a2a (diff) | |
ASoC: Add utility to parse DAPM routes from device tree
Implement snd_soc_of_parse_audio_routing(), a utility function that can
parses a simple DAPM route table 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>
Diffstat (limited to 'sound/soc/soc-core.c')
| -rw-r--r-- | sound/soc/soc-core.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 51eef9b7b53..42ad2db8f08 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -3342,6 +3342,63 @@ int snd_soc_of_parse_card_name(struct snd_soc_card *card, } EXPORT_SYMBOL_GPL(snd_soc_of_parse_card_name); +int snd_soc_of_parse_audio_routing(struct snd_soc_card *card, + const char *propname) +{ + struct device_node *np = card->dev->of_node; + int num_routes; + struct snd_soc_dapm_route *routes; + int i, ret; + + num_routes = of_property_count_strings(np, propname); + if (num_routes & 1) { + dev_err(card->dev, + "Property '%s's length is not even\n", + propname); + return -EINVAL; + } + num_routes /= 2; + if (!num_routes) { + dev_err(card->dev, + "Property '%s's length is zero\n", + propname); + return -EINVAL; + } + + routes = devm_kzalloc(card->dev, num_routes * sizeof(*routes), + GFP_KERNEL); + if (!routes) { + dev_err(card->dev, + "Could not allocate DAPM route table\n"); + return -EINVAL; + } + + for (i = 0; i < num_routes; i++) { + ret = of_property_read_string_index(np, propname, + 2 * i, &routes[i].sink); + if (ret) { + dev_err(card->dev, + "Property '%s' index %d could not be read: %d\n", + propname, 2 * i, ret); + return -EINVAL; + } + ret = of_property_read_string_index(np, propname, + (2 * i) + 1, &routes[i].source); + if (ret) { + dev_err(card->dev, + "Property '%s' index %d could not be read: %d\n", + propname, (2 * i) + 1, ret); + return -EINVAL; + } + } + + card->num_dapm_routes = num_routes; + card->dapm_routes = routes; + + return 0; +} +EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_routing); + static int __init snd_soc_init(void) { #ifdef CONFIG_DEBUG_FS |