1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  LED state routines for driver control interface
14 MODULE_DESCRIPTION("ALSA control interface to LED trigger code.");
17 #define MAX_LED (((SNDRV_CTL_ELEM_ACCESS_MIC_LED - SNDRV_CTL_ELEM_ACCESS_SPK_LED) \
33 	struct snd_ctl_led *led;  member
42 	enum snd_ctl_led_mode mode;  member
59 		.group = (SNDRV_CTL_ELEM_ACCESS_SPK_LED >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1,
61 		.mode = MODE_FOLLOW_MUTE,
65 		.group = (SNDRV_CTL_ELEM_ACCESS_MIC_LED >> SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1,
67 		.mode = MODE_FOLLOW_MUTE,
84 				SNDRV_CTL_ELEM_ACCESS_LED_SHIFT) - 1;  in access_to_group()
108 	struct snd_kcontrol *kctl = lctl->kctl;  in snd_ctl_led_get()
113 	info.id = kctl->id;  in snd_ctl_led_get()
114 	info.id.index += lctl->index_offset;  in snd_ctl_led_get()
115 	info.id.numid += lctl->index_offset;  in snd_ctl_led_get()
116 	result = kctl->info(kctl, &info);  in snd_ctl_led_get()
118 		return -1;  in snd_ctl_led_get()
121 	result = kctl->get(kctl, &value);  in snd_ctl_led_get()
123 		return -1;  in snd_ctl_led_get()
140 	struct snd_ctl_led *led;  in snd_ctl_led_set_state()  local
145 	led = snd_ctl_led_get_by_access(access);  in snd_ctl_led_set_state()
146 	if (!led)  in snd_ctl_led_set_state()
148 	route = -1;  in snd_ctl_led_set_state()
152 	if (card && !snd_ctl_led_card_valid[card->number]) {  in snd_ctl_led_set_state()
156 	list_for_each_entry(lctl, &led->controls, list) {  in snd_ctl_led_set_state()
157 		if (lctl->kctl == kctl && lctl->index_offset == ioff)  in snd_ctl_led_set_state()
164 			lctl->card = card;  in snd_ctl_led_set_state()
165 			lctl->access = access;  in snd_ctl_led_set_state()
166 			lctl->kctl = kctl;  in snd_ctl_led_set_state()
167 			lctl->index_offset = ioff;  in snd_ctl_led_set_state()
168 			list_add(&lctl->list, &led->controls);  in snd_ctl_led_set_state()
173 	switch (led->mode) {  in snd_ctl_led_set_state()
180 		ledtrig_audio_set(led->trigger_type, route ? LED_OFF : LED_ON);  in snd_ctl_led_set_state()
192 			if (lctl->kctl == kctl && lctl->index_offset == ioff)  in snd_ctl_led_find()
206 	if (lctl && (access == 0 || access != lctl->access)) {  in snd_ctl_led_remove()
207 		ret = lctl->access;  in snd_ctl_led_remove()
208 		list_del(&lctl->list);  in snd_ctl_led_remove()
226 		vd = &kctl->vd[ioff];  in snd_ctl_led_notify()
227 		access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;  in snd_ctl_led_notify()
235 		vd = &kctl->vd[ioff];  in snd_ctl_led_notify()
236 		access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;  in snd_ctl_led_notify()
253 		down_write(&card->controls_rwsem);  in snd_ctl_led_set_id()
257 			vd = &kctl->vd[ioff];  in snd_ctl_led_set_id()
258 			access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;  in snd_ctl_led_set_id()
260 				err = -EXDEV;  in snd_ctl_led_set_id()
263 			new_access = vd->access & ~SNDRV_CTL_ELEM_ACCESS_LED_MASK;  in snd_ctl_led_set_id()
266 			if (new_access != vd->access) {  in snd_ctl_led_set_id()
267 				vd->access = new_access;  in snd_ctl_led_set_id()
271 			err = -ENOENT;  in snd_ctl_led_set_id()
274 		up_write(&card->controls_rwsem);  in snd_ctl_led_set_id()
277 		err = -ENXIO;  in snd_ctl_led_set_id()
292 	list_del(&lctl->list);  in snd_ctl_led_ctl_destroy()
299 	struct snd_ctl_led *led;  in snd_ctl_led_clean()  local
303 		led = &snd_ctl_leds[group];  in snd_ctl_led_clean()
305 		list_for_each_entry(lctl, &led->controls, list)  in snd_ctl_led_clean()
306 			if (!card || lctl->card == card) {  in snd_ctl_led_clean()
316 	struct snd_ctl_led *led;  in snd_ctl_led_reset()  local
323 		return -ENXIO;  in snd_ctl_led_reset()
329 		return -ENXIO;  in snd_ctl_led_reset()
331 	led = &snd_ctl_leds[group];  in snd_ctl_led_reset()
333 	list_for_each_entry(lctl, &led->controls, list)  in snd_ctl_led_reset()
334 		if (lctl->card == card) {  in snd_ctl_led_reset()
335 			vd = &lctl->kctl->vd[lctl->index_offset];  in snd_ctl_led_reset()
336 			vd->access &= ~group_to_access(group);  in snd_ctl_led_reset()
353 	if (snd_BUG_ON(card->number < 0 ||  in snd_ctl_led_register()
354 		       card->number >= ARRAY_SIZE(snd_ctl_led_card_valid)))  in snd_ctl_led_register()
357 	snd_ctl_led_card_valid[card->number] = true;  in snd_ctl_led_register()
359 	/* the register callback is already called with held card->controls_rwsem */  in snd_ctl_led_register()
360 	list_for_each_entry(kctl, &card->controls, list)  in snd_ctl_led_register()
361 		for (ioff = 0; ioff < kctl->count; ioff++)  in snd_ctl_led_register()
371 	snd_ctl_led_card_valid[card->number] = false;  in snd_ctl_led_disconnect()
399 	struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);  in mode_show()  local
402 	switch (led->mode) {  in mode_show()
403 	case MODE_FOLLOW_MUTE:	str = "follow-mute"; break;  in mode_show()
404 	case MODE_FOLLOW_ROUTE:	str = "follow-route"; break;  in mode_show()
415 	struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);  in mode_store()  local
417 	size_t l = min(count, sizeof(_buf) - 1);  in mode_store()
418 	enum snd_ctl_led_mode mode;  in mode_store()  local
423 		mode = MODE_FOLLOW_MUTE;  in mode_store()
425 		mode = MODE_FOLLOW_ROUTE;  in mode_store()
427 		mode = MODE_OFF;  in mode_store()
429 		mode = MODE_ON;  in mode_store()
434 	led->mode = mode;  in mode_store()
437 	snd_ctl_led_set_state(NULL, group_to_access(led->group), NULL, 0);  in mode_store()
444 	struct snd_ctl_led *led = container_of(dev, struct snd_ctl_led, dev);  in brightness_show()  local
446 	return sysfs_emit(buf, "%u\n", ledtrig_audio_get(led->trigger_type));  in brightness_show()
449 static DEVICE_ATTR_RW(mode);
493 				val_size--;  in parse_string()
501 				val_size--;  in parse_string()
524  *   unsigned integer - numid (equivaled to numid=UINT)
525  *   string - basic mixer name (equivalent to iface=MIXER,name=STR)
537 		return -E2BIG;  in set_led_id()
576 	err = snd_ctl_led_set_id(led_card->number, &id, led_card->led->group, attach);  in set_led_id()
607 		err = snd_ctl_led_reset(led_card->number, led_card->led->group);  in reset_store()
622 	card = snd_card_ref(led_card->number);  in list_show()
624 		return -ENXIO;  in list_show()
625 	down_read(&card->controls_rwsem);  in list_show()
627 	if (snd_ctl_led_card_valid[led_card->number]) {  in list_show()
628 		list_for_each_entry(lctl, &led_card->led->controls, list) {  in list_show()
629 			if (lctl->card != card)  in list_show()
634 					   lctl->kctl->id.numid + lctl->index_offset);  in list_show()
638 	up_read(&card->controls_rwsem);  in list_show()
671 	struct snd_ctl_led *led;  in snd_ctl_led_sysfs_add()  local
675 		led = &snd_ctl_leds[group];  in snd_ctl_led_sysfs_add()
679 		led_card->number = card->number;  in snd_ctl_led_sysfs_add()
680 		led_card->led = led;  in snd_ctl_led_sysfs_add()
681 		device_initialize(&led_card->dev);  in snd_ctl_led_sysfs_add()
682 		led_card->dev.release = snd_ctl_led_card_release;  in snd_ctl_led_sysfs_add()
683 		if (dev_set_name(&led_card->dev, "card%d", card->number) < 0)  in snd_ctl_led_sysfs_add()
685 		led_card->dev.parent = &led->dev;  in snd_ctl_led_sysfs_add()
686 		led_card->dev.groups = snd_ctl_led_card_attr_groups;  in snd_ctl_led_sysfs_add()
687 		if (device_add(&led_card->dev))  in snd_ctl_led_sysfs_add()
689 		led->cards[card->number] = led_card;  in snd_ctl_led_sysfs_add()
690 		snprintf(link_name, sizeof(link_name), "led-%s", led->name);  in snd_ctl_led_sysfs_add()
691 		if (sysfs_create_link(&card->ctl_dev->kobj, &led_card->dev.kobj,  in snd_ctl_led_sysfs_add()
693 			dev_err(card->dev,  in snd_ctl_led_sysfs_add()
695 				 __func__, card->number);  in snd_ctl_led_sysfs_add()
696 		if (sysfs_create_link(&led_card->dev.kobj, &card->card_dev.kobj,  in snd_ctl_led_sysfs_add()
698 			dev_err(card->dev,  in snd_ctl_led_sysfs_add()
700 				__func__, card->number);  in snd_ctl_led_sysfs_add()
704 		put_device(&led_card->dev);  in snd_ctl_led_sysfs_add()
706 		printk(KERN_ERR "snd_ctl_led: unable to add card%d", card->number);  in snd_ctl_led_sysfs_add()
714 	struct snd_ctl_led *led;  in snd_ctl_led_sysfs_remove()  local
718 		led = &snd_ctl_leds[group];  in snd_ctl_led_sysfs_remove()
719 		led_card = led->cards[card->number];  in snd_ctl_led_sysfs_remove()
722 		snprintf(link_name, sizeof(link_name), "led-%s", led->name);  in snd_ctl_led_sysfs_remove()
723 		sysfs_remove_link(&card->ctl_dev->kobj, link_name);  in snd_ctl_led_sysfs_remove()
724 		sysfs_remove_link(&led_card->dev.kobj, "card");  in snd_ctl_led_sysfs_remove()
725 		device_unregister(&led_card->dev);  in snd_ctl_led_sysfs_remove()
726 		led->cards[card->number] = NULL;  in snd_ctl_led_sysfs_remove()
742 	struct snd_ctl_led *led;  in snd_ctl_led_init()  local
748 	dev_set_name(&snd_ctl_led_dev, "ctl-led");  in snd_ctl_led_init()
751 		return -ENOMEM;  in snd_ctl_led_init()
754 		led = &snd_ctl_leds[group];  in snd_ctl_led_init()
755 		INIT_LIST_HEAD(&led->controls);  in snd_ctl_led_init()
756 		device_initialize(&led->dev);  in snd_ctl_led_init()
757 		led->dev.parent = &snd_ctl_led_dev;  in snd_ctl_led_init()
758 		led->dev.release = snd_ctl_led_release;  in snd_ctl_led_init()
759 		led->dev.groups = snd_ctl_led_dev_attr_groups;  in snd_ctl_led_init()
760 		dev_set_name(&led->dev, led->name);  in snd_ctl_led_init()
761 		if (device_add(&led->dev)) {  in snd_ctl_led_init()
762 			put_device(&led->dev);  in snd_ctl_led_init()
763 			for (; group > 0; group--) {  in snd_ctl_led_init()
764 				led = &snd_ctl_leds[group - 1];  in snd_ctl_led_init()
765 				device_unregister(&led->dev);  in snd_ctl_led_init()
768 			return -ENOMEM;  in snd_ctl_led_init()
777 	struct snd_ctl_led *led;  in snd_ctl_led_exit()  local
792 		led = &snd_ctl_leds[group];  in snd_ctl_led_exit()
793 		device_unregister(&led->dev);  in snd_ctl_led_exit()