ALSA: vmaster: Add snd_ctl_sync_vmaster() helper function
Introduce a new helper function, snd_ctl_sync_vmaster(), which updates
the slave put callbacks forcibly as well as calling the hook. This
will be used in the upcoming patch in HD-audio codec driver for
toggling the mute in vmaster slaves.
Along with the new function, the old snd_ctl_sync_vmaster_hook() is
replaced as a macro calling with the argument hook_only=true.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/control.h b/include/sound/control.h
index 34bc93d..5358892 100644
--- a/include/sound/control.h
+++ b/include/sound/control.h
@@ -233,7 +233,8 @@
int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kctl,
void (*hook)(void *private_data, int),
void *private_data);
-void snd_ctl_sync_vmaster_hook(struct snd_kcontrol *kctl);
+void snd_ctl_sync_vmaster(struct snd_kcontrol *kctl, bool hook_only);
+#define snd_ctl_sync_vmaster_hook(kctl) snd_ctl_sync_vmaster(kctl, true)
/*
* Helper functions for jack-detection controls
diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c
index 02f90b4..5df8dc2 100644
--- a/sound/core/vmaster.c
+++ b/sound/core/vmaster.c
@@ -310,20 +310,10 @@
return 0;
}
-static int master_put(struct snd_kcontrol *kcontrol,
- struct snd_ctl_elem_value *ucontrol)
+static int sync_slaves(struct link_master *master, int old_val, int new_val)
{
- struct link_master *master = snd_kcontrol_chip(kcontrol);
struct link_slave *slave;
struct snd_ctl_elem_value *uval;
- int err, old_val;
-
- err = master_init(master);
- if (err < 0)
- return err;
- old_val = master->val;
- if (ucontrol->value.integer.value[0] == old_val)
- return 0;
uval = kmalloc(sizeof(*uval), GFP_KERNEL);
if (!uval)
@@ -332,11 +322,33 @@
master->val = old_val;
uval->id = slave->slave.id;
slave_get_val(slave, uval);
- master->val = ucontrol->value.integer.value[0];
+ master->val = new_val;
slave_put_val(slave, uval);
}
kfree(uval);
- if (master->hook && !err)
+ return 0;
+}
+
+static int master_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct link_master *master = snd_kcontrol_chip(kcontrol);
+ int err, new_val, old_val;
+ bool first_init;
+
+ err = master_init(master);
+ if (err < 0)
+ return err;
+ first_init = err;
+ old_val = master->val;
+ new_val = ucontrol->value.integer.value[0];
+ if (new_val == old_val)
+ return 0;
+
+ err = sync_slaves(master, old_val, new_val);
+ if (err < 0)
+ return err;
+ if (master->hook && first_init)
master->hook(master->hook_private_data, master->val);
return 1;
}
@@ -442,20 +454,33 @@
EXPORT_SYMBOL_GPL(snd_ctl_add_vmaster_hook);
/**
- * snd_ctl_sync_vmaster_hook - Sync the vmaster hook
+ * snd_ctl_sync_vmaster - Sync the vmaster slaves and hook
* @kcontrol: vmaster kctl element
+ * @hook_only: sync only the hook
*
- * Call the hook function to synchronize with the current value of the given
- * vmaster element. NOP when NULL is passed to @kcontrol or the hook doesn't
- * exist.
+ * Forcibly call the put callback of each slave and call the hook function
+ * to synchronize with the current value of the given vmaster element.
+ * NOP when NULL is passed to @kcontrol.
*/
-void snd_ctl_sync_vmaster_hook(struct snd_kcontrol *kcontrol)
+void snd_ctl_sync_vmaster(struct snd_kcontrol *kcontrol, bool hook_only)
{
struct link_master *master;
+ bool first_init = false;
+
if (!kcontrol)
return;
master = snd_kcontrol_chip(kcontrol);
- if (master->hook)
+ if (!hook_only) {
+ int err = master_init(master);
+ if (err < 0)
+ return;
+ first_init = err;
+ err = sync_slaves(master, master->val, master->val);
+ if (err < 0)
+ return;
+ }
+
+ if (master->hook && !first_init)
master->hook(master->hook_private_data, master->val);
}
-EXPORT_SYMBOL_GPL(snd_ctl_sync_vmaster_hook);
+EXPORT_SYMBOL_GPL(snd_ctl_sync_vmaster);