From 2ad787e9aae8bfac14fa96748c0f2b034577be6a Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 12 Mar 2012 12:18:37 +0100 Subject: ALSA: Add a hook capability to vmaster controls This patch adds a hook to vmaster control to be called at each time when the master value is changed. It'd be handy for an additional mute LED control following the Master switch, for example. Signed-off-by: Takashi Iwai --- sound/core/vmaster.c | 46 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 45 insertions(+), 1 deletion(-) (limited to 'sound/core') diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c index 130cfe677d60..14a286a7bf2b 100644 --- a/sound/core/vmaster.c +++ b/sound/core/vmaster.c @@ -37,6 +37,8 @@ struct link_master { struct link_ctl_info info; int val; /* the master value */ unsigned int tlv[4]; + void (*hook)(void *private_data, int); + void *hook_private_data; }; /* @@ -126,7 +128,9 @@ static int master_init(struct link_master *master) master->info.count = 1; /* always mono */ /* set full volume as default (= no attenuation) */ master->val = master->info.max_val; - return 0; + if (master->hook) + master->hook(master->hook_private_data, master->val); + return 1; } return -ENOENT; } @@ -329,6 +333,8 @@ static int master_put(struct snd_kcontrol *kcontrol, slave_put_val(slave, uval); } kfree(uval); + if (master->hook && !err) + master->hook(master->hook_private_data, master->val); return 1; } @@ -408,3 +414,41 @@ struct snd_kcontrol *snd_ctl_make_virtual_master(char *name, return kctl; } EXPORT_SYMBOL(snd_ctl_make_virtual_master); + +/** + * snd_ctl_add_vmaster_hook - Add a hook to a vmaster control + * @kcontrol: vmaster kctl element + * @hook: the hook function + * + * Adds the given hook to the vmaster control element so that it's called + * at each time when the value is changed. + */ +int snd_ctl_add_vmaster_hook(struct snd_kcontrol *kcontrol, + void (*hook)(void *private_data, int), + void *private_data) +{ + struct link_master *master = snd_kcontrol_chip(kcontrol); + master->hook = hook; + master->hook_private_data = private_data; + return 0; +} +EXPORT_SYMBOL_GPL(snd_ctl_add_vmaster_hook); + +/** + * snd_ctl_sync_vmaster_hook - Sync the vmaster hook + * @kcontrol: vmaster kctl element + * + * 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. + */ +void snd_ctl_sync_vmaster_hook(struct snd_kcontrol *kcontrol) +{ + struct link_master *master; + if (!kcontrol) + return; + master = snd_kcontrol_chip(kcontrol); + if (master->hook) + master->hook(master->hook_private_data, master->val); +} +EXPORT_SYMBOL_GPL(snd_ctl_sync_vmaster_hook); -- cgit v1.2.3