Add a new function to look up PCM format codes by name. This can be used
by ASoC drivers to look up formats through device-tree properties, for
instance.
Signed-off-by: Daniel Mack <daniel@xxxxxxxxxx>
---
include/sound/pcm.h | 1 +
sound/core/pcm.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 8a89fa6fdd5e..1bfde6f2f180 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -1339,6 +1339,7 @@ static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
(IEC958_AES3_CON_FS_48000<<24))
const char *snd_pcm_format_name(snd_pcm_format_t format);
+int snd_pcm_format_by_name(const char *name, snd_pcm_format_t *format);
/**
* snd_pcm_stream_str - Get a string naming the direction of a stream
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 9a72d641743d..c02d8df4f92b 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -225,6 +225,29 @@ const char *snd_pcm_format_name(snd_pcm_format_t format)
}
EXPORT_SYMBOL_GPL(snd_pcm_format_name);
+/**
+ * snd_pcm_format_by_name - Return the PCM format code for the given name
+ * @name: PCM format name ('S16_LE', 'S24_3LE', ...)
+ * @format: Pointer to returned PCM format code
+ *
+ * The string comparison is done in a case-insensitive way.
+ *
+ * Return: 0 on success, or -ENOENT if the given format is not valid.
+ */
+int snd_pcm_format_by_name(const char *name, snd_pcm_format_t *format)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(snd_pcm_format_names); i++)
+ if (strcasecmp(name, snd_pcm_format_names[i]) == 0) {
+ *format = i;
+ return 0;
+ }
+
+ return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(snd_pcm_format_by_name);
+
#ifdef CONFIG_SND_VERBOSE_PROCFS
#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
--
2.23.0
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