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-rw-r--r--sound/core/control.c33
1 files changed, 28 insertions, 5 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index 1f1ab9c1b66..4c3aa8e1037 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1,6 +1,6 @@
/*
* Routines for driver control interface
- * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
@@ -716,8 +716,6 @@ int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control)
return result;
}
-EXPORT_SYMBOL(snd_ctl_elem_read);
-
static int snd_ctl_elem_read_user(struct snd_card *card,
struct snd_ctl_elem_value __user *_control)
{
@@ -781,8 +779,6 @@ int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file,
return result;
}
-EXPORT_SYMBOL(snd_ctl_elem_write);
-
static int snd_ctl_elem_write_user(struct snd_ctl_file *file,
struct snd_ctl_elem_value __user *_control)
{
@@ -1486,3 +1482,30 @@ int snd_ctl_create(struct snd_card *card)
snd_assert(card != NULL, return -ENXIO);
return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops);
}
+
+/*
+ * Frequently used control callbacks
+ */
+int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+ uinfo->count = 1;
+ uinfo->value.integer.min = 0;
+ uinfo->value.integer.max = 1;
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_ctl_boolean_mono_info);
+
+int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+ uinfo->count = 2;
+ uinfo->value.integer.min = 0;
+ uinfo->value.integer.max = 1;
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_ctl_boolean_stereo_info);