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;  member
108 /* initialize master volume */
109 static int master_init(struct link_master *master)  in master_init()  argument
113 	if (master->info.count)  in master_init()
116 	list_for_each_entry(follower, &master->followers, list) {  in master_init()
120 		master->info = follower->info;  in master_init()
121 		master->info.count = 1; /* always mono */  in master_init()
123 		master->val = master->info.max_val;  in master_init()
124 		if (master->hook)  in master_init()
125 			master->hook(master->hook_private_data, master->val);  in master_init()
149 	err = master_init(follower->master);  in follower_put_val()
157 				!!follower->master->val;  in follower_put_val()
161 			/* max master volume is supposed to be 0 dB */  in follower_put_val()
163 			vol += follower->master->val - follower->master->info.max_val;  in follower_put_val()
235 	if (follower->master)  in follower_free()
241  * Add a follower control to the group with the given master control
250  * - master can only attenuate the volume, no gain
252 int _snd_ctl_add_follower(struct snd_kcontrol *master,  in _snd_ctl_add_follower()  argument
256 	struct link_master *master_link = snd_kcontrol_chip(master);  in _snd_ctl_add_follower()
266 	srec->master = master_link;  in _snd_ctl_add_follower()
286  * @master: the target vmaster kcontrol object
292 int snd_ctl_add_followers(struct snd_card *card, struct snd_kcontrol *master,  in snd_ctl_add_followers()  argument
301 			err = snd_ctl_add_follower(master, follower);  in snd_ctl_add_followers()
312  * ctl callbacks for master controls
317 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_info()  local
320 	ret = master_init(master);  in master_info()
323 	uinfo->type = master->info.type;  in master_info()
324 	uinfo->count = master->info.count;  in master_info()
325 	uinfo->value.integer.min = master->info.min_val;  in master_info()
326 	uinfo->value.integer.max = master->info.max_val;  in master_info()
333 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_get()  local
334 	int err = master_init(master);  in master_get()
337 	ucontrol->value.integer.value[0] = master->val;  in master_get()
341 static int sync_followers(struct link_master *master, int old_val, int new_val)  in sync_followers()  argument
349 	list_for_each_entry(follower, &master->followers, list) {  in sync_followers()
350 		master->val = old_val;  in sync_followers()
353 		master->val = new_val;  in sync_followers()
362 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_put()  local
366 	err = master_init(master);  in master_put()
370 	old_val = master->val;  in master_put()
374 	if (new_val < master->info.min_val || new_val > master->info.max_val)  in master_put()
377 	err = sync_followers(master, old_val, new_val);  in master_put()
380 	if (master->hook && !first_init)  in master_put()
381 		master->hook(master->hook_private_data, master->val);  in master_put()
387 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_free()  local
391 	list_for_each_entry_safe(follower, n, &master->followers, list) {  in master_free()
400 	kfree(master);  in master_free()
405  * snd_ctl_make_virtual_master - Create a virtual master control
409  * Creates a virtual master control with the given name string.
415  * for dB scale of the master control.  It should be a single element
424 	struct link_master *master;  in snd_ctl_make_virtual_master()  local
433 	master = kzalloc(sizeof(*master), GFP_KERNEL);  in snd_ctl_make_virtual_master()
434 	if (!master)  in snd_ctl_make_virtual_master()
436 	INIT_LIST_HEAD(&master->followers);  in snd_ctl_make_virtual_master()
438 	kctl = snd_ctl_new1(&knew, master);  in snd_ctl_make_virtual_master()
440 		kfree(master);  in snd_ctl_make_virtual_master()
456 			memcpy(master->tlv, tlv, sizeof(master->tlv));  in snd_ctl_make_virtual_master()
457 			kctl->tlv.p = master->tlv;  in snd_ctl_make_virtual_master()
480 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in snd_ctl_add_vmaster_hook()  local
481 	master->hook = hook;  in snd_ctl_add_vmaster_hook()
482 	master->hook_private_data = private_data;  in snd_ctl_add_vmaster_hook()
498 	struct link_master *master;  in snd_ctl_sync_vmaster()  local
503 	master = snd_kcontrol_chip(kcontrol);  in snd_ctl_sync_vmaster()
505 		int err = master_init(master);  in snd_ctl_sync_vmaster()
509 		err = sync_followers(master, master->val, master->val);  in snd_ctl_sync_vmaster()
514 	if (master->hook && !first_init)  in snd_ctl_sync_vmaster()
515 		master->hook(master->hook_private_data, master->val);  in snd_ctl_sync_vmaster()
535 	struct link_master *master;  in snd_ctl_apply_vmaster_followers()  local
539 	master = snd_kcontrol_chip(kctl);  in snd_ctl_apply_vmaster_followers()
540 	err = master_init(master);  in snd_ctl_apply_vmaster_followers()
543 	list_for_each_entry(follower, &master->followers, list) {  in snd_ctl_apply_vmaster_followers()