sound/core/vmaster.c

3  * Virtual master and follower controls
24  * link master - this contains a list of follower controls that are
28  * The master control is so far only mono volume/switch for simplicity.
34 	int val;		/* the master value */
44  * master control.  A follower may have either one or two channels.
49 	struct link_master *master;
108 /* initialize master volume */
109 static int master_init(struct link_master *master)
113 	if (master->info.count)
116 	list_for_each_entry(follower, &master->followers, list) {
120 		master->info = follower->info;
121 		master->info.count = 1; /* always mono */
123 		master->val = master->info.max_val;
124 		if (master->hook)
125 			master->hook(master->hook_private_data, master->val);
149 	err = master_init(follower->master);
157 				!!follower->master->val;
161 			/* max master volume is supposed to be 0 dB */
163 			vol += follower->master->val - follower->master->info.max_val;
229 	if (follower->master)
235  * Add a follower control to the group with the given master control
244  * - master can only attenuate the volume, no gain
246 int _snd_ctl_add_follower(struct snd_kcontrol *master,
250 	struct link_master *master_link = snd_kcontrol_chip(master);
260 	srec->master = master_link;
280  * @master: the target vmaster kcontrol object
286 int snd_ctl_add_followers(struct snd_card *card, struct snd_kcontrol *master,
295 			err = snd_ctl_add_follower(master, follower);
306  * ctl callbacks for master controls
311 	struct link_master *master = snd_kcontrol_chip(kcontrol);
314 	ret = master_init(master);
317 	uinfo->type = master->info.type;
318 	uinfo->count = master->info.count;
319 	uinfo->value.integer.min = master->info.min_val;
320 	uinfo->value.integer.max = master->info.max_val;
327 	struct link_master *master = snd_kcontrol_chip(kcontrol);
328 	int err = master_init(master);
331 	ucontrol->value.integer.value[0] = master->val;
335 static int sync_followers(struct link_master *master, int old_val, int new_val)
343 	list_for_each_entry(follower, &master->followers, list) {
344 		master->val = old_val;
347 		master->val = new_val;
356 	struct link_master *master = snd_kcontrol_chip(kcontrol);
360 	err = master_init(master);
364 	old_val = master->val;
369 	err = sync_followers(master, old_val, new_val);
372 	if (master->hook && !first_init)
373 		master->hook(master->hook_private_data, master->val);
379 	struct link_master *master = snd_kcontrol_chip(kcontrol);
383 	list_for_each_entry_safe(follower, n, &master->followers, list) {
392 	kfree(master);
397  * snd_ctl_make_virtual_master - Create a virtual master control
401  * Creates a virtual master control with the given name string.
407  * for dB scale of the master control.  It should be a single element
416 	struct link_master *master;
425 	master = kzalloc(sizeof(*master), GFP_KERNEL);
426 	if (!master)
428 	INIT_LIST_HEAD(&master->followers);
430 	kctl = snd_ctl_new1(&knew, master);
432 		kfree(master);
448 			memcpy(master->tlv, tlv, sizeof(master->tlv));
449 			kctl->tlv.p = master->tlv;
472 	struct link_master *master = snd_kcontrol_chip(kcontrol);
473 	master->hook = hook;
474 	master->hook_private_data = private_data;
490 	struct link_master *master;
495 	master = snd_kcontrol_chip(kcontrol);
497 		int err = master_init(master);
501 		err = sync_followers(master, master->val, master->val);
506 	if (master->hook && !first_init)
507 		master->hook(master->hook_private_data, master->val);
527 	struct link_master *master;
531 	master = snd_kcontrol_chip(kctl);
532 	err = master_init(master);
535 	list_for_each_entry(follower, &master->followers, list) {