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
114 /* initialize master volume */
115 static int master_init(struct link_master *master)  in master_init()  argument
119 	if (master->info.count)  in master_init()
122 	list_for_each_entry(follower, &master->followers, list) {  in master_init()
126 		master->info = follower->info;  in master_init()
127 		master->info.count = 1; /* always mono */  in master_init()
129 		master->val = master->info.max_val;  in master_init()
130 		if (master->hook)  in master_init()
131 			master->hook(master->hook_private_data, master->val);  in master_init()
155 	err = master_init(follower->master);  in follower_put_val()
163 				!!follower->master->val;  in follower_put_val()
167 			/* max master volume is supposed to be 0 dB */  in follower_put_val()
169 			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()
284  * ctl callbacks for master controls
289 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_info()  local
292 	ret = master_init(master);  in master_info()
295 	uinfo->type = master->info.type;  in master_info()
296 	uinfo->count = master->info.count;  in master_info()
297 	uinfo->value.integer.min = master->info.min_val;  in master_info()
298 	uinfo->value.integer.max = master->info.max_val;  in master_info()
305 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_get()  local
306 	int err = master_init(master);  in master_get()
309 	ucontrol->value.integer.value[0] = master->val;  in master_get()
313 static int sync_followers(struct link_master *master, int old_val, int new_val)  in sync_followers()  argument
321 	list_for_each_entry(follower, &master->followers, list) {  in sync_followers()
322 		master->val = old_val;  in sync_followers()
325 		master->val = new_val;  in sync_followers()
335 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_put()  local
339 	err = master_init(master);  in master_put()
343 	old_val = master->val;  in master_put()
348 	err = sync_followers(master, old_val, new_val);  in master_put()
351 	if (master->hook && !first_init)  in master_put()
352 		master->hook(master->hook_private_data, master->val);  in master_put()
358 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_free()  local
362 	list_for_each_entry_safe(follower, n, &master->followers, list) {  in master_free()
371 	kfree(master);  in master_free()
376  * snd_ctl_make_virtual_master - Create a virtual master control
380  * Creates a virtual master control with the given name string.
386  * for dB scale of the master control.  It should be a single element
395 	struct link_master *master;  in snd_ctl_make_virtual_master()  local
404 	master = kzalloc(sizeof(*master), GFP_KERNEL);  in snd_ctl_make_virtual_master()
405 	if (!master)  in snd_ctl_make_virtual_master()
407 	INIT_LIST_HEAD(&master->followers);  in snd_ctl_make_virtual_master()
409 	kctl = snd_ctl_new1(&knew, master);  in snd_ctl_make_virtual_master()
411 		kfree(master);  in snd_ctl_make_virtual_master()
427 			memcpy(master->tlv, tlv, sizeof(master->tlv));  in snd_ctl_make_virtual_master()
428 			kctl->tlv.p = master->tlv;  in snd_ctl_make_virtual_master()
451 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in snd_ctl_add_vmaster_hook()  local
452 	master->hook = hook;  in snd_ctl_add_vmaster_hook()
453 	master->hook_private_data = private_data;  in snd_ctl_add_vmaster_hook()
469 	struct link_master *master;  in snd_ctl_sync_vmaster()  local
474 	master = snd_kcontrol_chip(kcontrol);  in snd_ctl_sync_vmaster()
476 		int err = master_init(master);  in snd_ctl_sync_vmaster()
480 		err = sync_followers(master, master->val, master->val);  in snd_ctl_sync_vmaster()
485 	if (master->hook && !first_init)  in snd_ctl_sync_vmaster()
486 		master->hook(master->hook_private_data, master->val);  in snd_ctl_sync_vmaster()
505 	struct link_master *master;  in snd_ctl_apply_vmaster_followers()  local
509 	master = snd_kcontrol_chip(kctl);  in snd_ctl_apply_vmaster_followers()
510 	err = master_init(master);  in snd_ctl_apply_vmaster_followers()
513 	list_for_each_entry(follower, &master->followers, list) {  in snd_ctl_apply_vmaster_followers()