2  * Virtual master and slave controls
28  * link master - this contains a list of slave controls that are
32  * The master control is so far only mono volume/switch for simplicity.
38 	int val;		/* the master value */
48  * master control.  A slave may have either one or two channels.
53 	struct link_master *master;  member
118 /* initialize master volume */
119 static int master_init(struct link_master *master)  in master_init()  argument
123 	if (master->info.count)  in master_init()
126 	list_for_each_entry(slave, &master->slaves, list) {  in master_init()
130 		master->info = slave->info;  in master_init()
131 		master->info.count = 1; /* always mono */  in master_init()
133 		master->val = master->info.max_val;  in master_init()
134 		if (master->hook)  in master_init()
135 			master->hook(master->hook_private_data, master->val);  in master_init()
159 	err = master_init(slave->master);  in slave_put_val()
167 				!!slave->master->val;  in slave_put_val()
171 			/* max master volume is supposed to be 0 dB */  in slave_put_val()
173 			vol += slave->master->val - slave->master->info.max_val;  in slave_put_val()
239 	if (slave->master)  in slave_free()
245  * Add a slave control to the group with the given master control
254  * - master can only attenuate the volume, no gain
256 int _snd_ctl_add_slave(struct snd_kcontrol *master, struct snd_kcontrol *slave,  in _snd_ctl_add_slave()  argument
259 	struct link_master *master_link = snd_kcontrol_chip(master);  in _snd_ctl_add_slave()
269 	srec->master = master_link;  in _snd_ctl_add_slave()
287  * ctl callbacks for master controls
292 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_info()  local
295 	ret = master_init(master);  in master_info()
298 	uinfo->type = master->info.type;  in master_info()
299 	uinfo->count = master->info.count;  in master_info()
300 	uinfo->value.integer.min = master->info.min_val;  in master_info()
301 	uinfo->value.integer.max = master->info.max_val;  in master_info()
308 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_get()  local
309 	int err = master_init(master);  in master_get()
312 	ucontrol->value.integer.value[0] = master->val;  in master_get()
316 static int sync_slaves(struct link_master *master, int old_val, int new_val)  in sync_slaves()  argument
324 	list_for_each_entry(slave, &master->slaves, list) {  in sync_slaves()
325 		master->val = old_val;  in sync_slaves()
328 		master->val = new_val;  in sync_slaves()
338 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_put()  local
342 	err = master_init(master);  in master_put()
346 	old_val = master->val;  in master_put()
351 	err = sync_slaves(master, old_val, new_val);  in master_put()
354 	if (master->hook && !first_init)  in master_put()
355 		master->hook(master->hook_private_data, master->val);  in master_put()
361 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in master_free()  local
365 	list_for_each_entry_safe(slave, n, &master->slaves, list) {  in master_free()
374 	kfree(master);  in master_free()
379  * snd_ctl_make_virtual_master - Create a virtual master control
383  * Creates a virtual master control with the given name string.
389  * for dB scale of the master control.  It should be a single element
398 	struct link_master *master;  in snd_ctl_make_virtual_master()  local
407 	master = kzalloc(sizeof(*master), GFP_KERNEL);  in snd_ctl_make_virtual_master()
408 	if (!master)  in snd_ctl_make_virtual_master()
410 	INIT_LIST_HEAD(&master->slaves);  in snd_ctl_make_virtual_master()
412 	kctl = snd_ctl_new1(&knew, master);  in snd_ctl_make_virtual_master()
414 		kfree(master);  in snd_ctl_make_virtual_master()
430 			memcpy(master->tlv, tlv, sizeof(master->tlv));  in snd_ctl_make_virtual_master()
431 			kctl->tlv.p = master->tlv;  in snd_ctl_make_virtual_master()
454 	struct link_master *master = snd_kcontrol_chip(kcontrol);  in snd_ctl_add_vmaster_hook()  local
455 	master->hook = hook;  in snd_ctl_add_vmaster_hook()
456 	master->hook_private_data = private_data;  in snd_ctl_add_vmaster_hook()
472 	struct link_master *master;  in snd_ctl_sync_vmaster()  local
477 	master = snd_kcontrol_chip(kcontrol);  in snd_ctl_sync_vmaster()
479 		int err = master_init(master);  in snd_ctl_sync_vmaster()
483 		err = sync_slaves(master, master->val, master->val);  in snd_ctl_sync_vmaster()
488 	if (master->hook && !first_init)  in snd_ctl_sync_vmaster()
489 		master->hook(master->hook_private_data, master->val);  in snd_ctl_sync_vmaster()
508 	struct link_master *master;  in snd_ctl_apply_vmaster_slaves()  local
512 	master = snd_kcontrol_chip(kctl);  in snd_ctl_apply_vmaster_slaves()
513 	err = master_init(master);  in snd_ctl_apply_vmaster_slaves()
516 	list_for_each_entry(slave, &master->slaves, list) {  in snd_ctl_apply_vmaster_slaves()