1 // SPDX-License-Identifier: GPL-2.0-only
6  * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
35 	return sprintf(buf, "%u\n", led_cdev->brightness);  in brightness_show()
42 	unsigned long state;  in brightness_store()  local
45 	mutex_lock(&led_cdev->led_access);  in brightness_store()
48 		ret = -EBUSY;  in brightness_store()
52 	ret = kstrtoul(buf, 10, &state);  in brightness_store()
56 	if (state == LED_OFF)  in brightness_store()
58 	led_set_brightness(led_cdev, state);  in brightness_store()
59 	flush_work(&led_cdev->set_brightness_work);  in brightness_store()
63 	mutex_unlock(&led_cdev->led_access);  in brightness_store()
73 	return sprintf(buf, "%u\n", led_cdev->max_brightness);  in max_brightness_show()
112 	if (led_cdev->brightness_hw_changed == -1)  in brightness_hw_changed_show()
113 		return -ENODATA;  in brightness_hw_changed_show()
115 	return sprintf(buf, "%u\n", led_cdev->brightness_hw_changed);  in brightness_hw_changed_show()
122 	struct device *dev = led_cdev->dev;  in led_add_brightness_hw_changed()
131 	led_cdev->brightness_hw_changed_kn =  in led_add_brightness_hw_changed()
132 		sysfs_get_dirent(dev->kobj.sd, "brightness_hw_changed");  in led_add_brightness_hw_changed()
133 	if (!led_cdev->brightness_hw_changed_kn) {  in led_add_brightness_hw_changed()
136 		return -ENXIO;  in led_add_brightness_hw_changed()
144 	sysfs_put(led_cdev->brightness_hw_changed_kn);  in led_remove_brightness_hw_changed()
145 	device_remove_file(led_cdev->dev, &dev_attr_brightness_hw_changed);  in led_remove_brightness_hw_changed()
150 	if (WARN_ON(!led_cdev->brightness_hw_changed_kn))  in led_classdev_notify_brightness_hw_changed()
153 	led_cdev->brightness_hw_changed = brightness;  in led_classdev_notify_brightness_hw_changed()
154 	sysfs_notify_dirent(led_cdev->brightness_hw_changed_kn);  in led_classdev_notify_brightness_hw_changed()
168  * led_classdev_suspend - suspend an led_classdev.
173 	led_cdev->flags |= LED_SUSPENDED;  in led_classdev_suspend()
175 	flush_work(&led_cdev->set_brightness_work);  in led_classdev_suspend()
180  * led_classdev_resume - resume an led_classdev.
185 	led_set_brightness_nopm(led_cdev, led_cdev->brightness);  in led_classdev_resume()
187 	if (led_cdev->flash_resume)  in led_classdev_resume()
188 		led_cdev->flash_resume(led_cdev);  in led_classdev_resume()
190 	led_cdev->flags &= ~LED_SUSPENDED;  in led_classdev_resume()
199 	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)  in led_suspend()
209 	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)  in led_resume()
219  * of_led_get() - request a LED device via the LED framework
224  * property of a device tree node or a negative error-code on failure.
234 		return ERR_PTR(-ENOENT);  in of_led_get()
240 		return ERR_PTR(-EPROBE_DEFER);  in of_led_get()
244 	if (!try_module_get(led_cdev->dev->parent->driver->owner))  in of_led_get()
245 		return ERR_PTR(-ENODEV);  in of_led_get()
252  * led_put() - release a LED device
257 	module_put(led_cdev->dev->parent->driver->owner);  in led_put()
269  * devm_of_led_get - Resource-managed request of a LED device
286 		return ERR_PTR(-EINVAL);  in devm_of_led_get()
288 	led = of_led_get(dev->of_node, index);  in devm_of_led_get()
296 		return ERR_PTR(-ENOMEM);  in devm_of_led_get()
322 		return -ENOMEM;  in led_classdev_next_name()
328  * led_classdev_register_ext - register a new object of led_classdev class
345 		if (init_data->devname_mandatory && !init_data->devicename) {  in led_classdev_register_ext()
347 			return -EINVAL;  in led_classdev_register_ext()
353 		if (init_data->fwnode) {  in led_classdev_register_ext()
354 			fwnode_property_read_string(init_data->fwnode,  in led_classdev_register_ext()
355 				"linux,default-trigger",  in led_classdev_register_ext()
356 				&led_cdev->default_trigger);  in led_classdev_register_ext()
358 			if (fwnode_property_present(init_data->fwnode,  in led_classdev_register_ext()
359 						    "retain-state-shutdown"))  in led_classdev_register_ext()
360 				led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;  in led_classdev_register_ext()
363 		proposed_name = led_cdev->name;  in led_classdev_register_ext()
370 	mutex_init(&led_cdev->led_access);  in led_classdev_register_ext()
371 	mutex_lock(&led_cdev->led_access);  in led_classdev_register_ext()
372 	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,  in led_classdev_register_ext()
373 				led_cdev, led_cdev->groups, "%s", final_name);  in led_classdev_register_ext()
374 	if (IS_ERR(led_cdev->dev)) {  in led_classdev_register_ext()
375 		mutex_unlock(&led_cdev->led_access);  in led_classdev_register_ext()
376 		return PTR_ERR(led_cdev->dev);  in led_classdev_register_ext()
378 	if (init_data && init_data->fwnode)  in led_classdev_register_ext()
379 		device_set_node(led_cdev->dev, init_data->fwnode);  in led_classdev_register_ext()
383 				proposed_name, dev_name(led_cdev->dev));  in led_classdev_register_ext()
385 	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED) {  in led_classdev_register_ext()
388 			device_unregister(led_cdev->dev);  in led_classdev_register_ext()
389 			led_cdev->dev = NULL;  in led_classdev_register_ext()
390 			mutex_unlock(&led_cdev->led_access);  in led_classdev_register_ext()
395 	led_cdev->work_flags = 0;  in led_classdev_register_ext()
397 	init_rwsem(&led_cdev->trigger_lock);  in led_classdev_register_ext()
400 	led_cdev->brightness_hw_changed = -1;  in led_classdev_register_ext()
404 	list_add_tail(&led_cdev->node, &leds_list);  in led_classdev_register_ext()
407 	if (!led_cdev->max_brightness)  in led_classdev_register_ext()
408 		led_cdev->max_brightness = LED_FULL;  in led_classdev_register_ext()
418 	mutex_unlock(&led_cdev->led_access);  in led_classdev_register_ext()
421 			led_cdev->name);  in led_classdev_register_ext()
428  * led_classdev_unregister - unregisters a object of led_properties class.
435 	if (IS_ERR_OR_NULL(led_cdev->dev))  in led_classdev_unregister()
439 	down_write(&led_cdev->trigger_lock);  in led_classdev_unregister()
440 	if (led_cdev->trigger)  in led_classdev_unregister()
442 	up_write(&led_cdev->trigger_lock);  in led_classdev_unregister()
445 	led_cdev->flags |= LED_UNREGISTERING;  in led_classdev_unregister()
450 	if (!(led_cdev->flags & LED_RETAIN_AT_SHUTDOWN))  in led_classdev_unregister()
453 	flush_work(&led_cdev->set_brightness_work);  in led_classdev_unregister()
455 	if (led_cdev->flags & LED_BRIGHT_HW_CHANGED)  in led_classdev_unregister()
458 	device_unregister(led_cdev->dev);  in led_classdev_unregister()
461 	list_del(&led_cdev->node);  in led_classdev_unregister()
464 	mutex_destroy(&led_cdev->led_access);  in led_classdev_unregister()
474  * devm_led_classdev_register_ext - resource managed led_classdev_register_ext()
489 		return -ENOMEM;  in devm_led_classdev_register_ext()
515  * devm_led_classdev_unregister() - resource managed led_classdev_unregister()
533 	leds_class->pm = &leds_class_dev_pm_ops;  in leds_init()
534 	leds_class->dev_groups = led_groups;  in leds_init()