Add error checking macros, and initial support for volume control

Signed-off-by: Mark Farrugia <mark.farrugia@fiberdyne.com.au>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/avirt/avirt.h b/include/avirt/avirt.h
index 92eb23c..f1c4060 100644
--- a/include/avirt/avirt.h
+++ b/include/avirt/avirt.h
@@ -71,4 +71,21 @@ int snd_avirt_pcm_info(const char *pcm_name, snd_pcm_info_t *pcm_info);
  * @return: The ALSA card index on success, negative ERRNO otherwise
  */
 int snd_avirt_card_index_get(int avirt_idx);
+
+/**
+ * snd_avirt_ctl_set_volume - Set an ALSA mixer volume value
+ * @name: The ALSA volume control name to set
+ * @volume: The volume to set
+ * @return: 0 on success, negative ERRNO otherwise
+ */
+int snd_avirt_ctl_set_volume(const char *name, long volume);
+
+/**
+ * snd_avirt_ctl_set_volume - Get an ALSA mixer volume value
+ * @name: The ALSA volume control name to get
+ * @volume: Populate this with the gotten value
+ * @return: 0 on success, negative ERRNO otherwise
+ */
+int snd_avirt_ctl_get_volume(const char *name, long *volume);
+
 #endif // _AVIRT_H_