ALSA: control: Provide a helper to look for the preferred subdevice
Instead of open-coding the search over the control file loop, provide
a helper function for the preferred subdevice assigned to the current
process.
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/control.h b/include/sound/control.h
index 0426139..75f3054 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -93,12 +93,17 @@
struct pid;
+enum {
+ SND_CTL_SUBDEV_PCM,
+ SND_CTL_SUBDEV_RAWMIDI,
+ SND_CTL_SUBDEV_ITEMS,
+};
+
struct snd_ctl_file {
struct list_head list; /* list of all control files */
struct snd_card *card;
struct pid *pid;
- int prefer_pcm_subdevice;
- int prefer_rawmidi_subdevice;
+ int preferred_subdevice[SND_CTL_SUBDEV_ITEMS];
wait_queue_head_t change_sleep;
spinlock_t read_lock;
struct fasync_struct *fasync;
@@ -138,6 +143,8 @@
#define snd_ctl_unregister_ioctl_compat(fcn)
#endif
+int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type);
+
static inline unsigned int snd_ctl_get_ioffnum(struct snd_kcontrol *kctl, struct snd_ctl_elem_id *id)
{
return id->numid - kctl->id.numid;