video/backlight/backlight.c

80 void backlight_notify_blank(struct backlight_device *bd, struct device *display_dev,
83 	guard(mutex)(&bd->ops_lock);
85 	if (!bd->ops)
87 	if (bd->ops->controls_device && !bd->ops->controls_device(bd, display_dev))
90 	if (fb_on && (!prev_fb_on || !bd->use_count)) {
91 		if (!bd->use_count++) {
92 			bd->props.state &= ~BL_CORE_FBBLANK;
93 			backlight_update_status(bd);
95 	} else if (!fb_on && prev_fb_on && bd->use_count) {
96 		if (!(--bd->use_count)) {
97 			bd->props.state |= BL_CORE_FBBLANK;
98 			backlight_update_status(bd);
106 	struct backlight_device *bd;
110 	list_for_each_entry(bd, &backlight_dev_list, entry)
111 		backlight_notify_blank(bd, display_dev, fb_on, prev_fb_on);
115 static void backlight_generate_event(struct backlight_device *bd,
132 	kobject_uevent_env(&bd->dev.kobj, KOBJ_CHANGE, envp);
133 	sysfs_notify(&bd->dev.kobj, NULL, "actual_brightness");
139 	struct backlight_device *bd = to_backlight_device(dev);
141 	return sprintf(buf, "%d\n", bd->props.power);
148 	struct backlight_device *bd = to_backlight_device(dev);
156 	mutex_lock(&bd->ops_lock);
157 	if (bd->ops) {
159 		if (bd->props.power != power) {
160 			old_power = bd->props.power;
161 			bd->props.power = power;
162 			rc = backlight_update_status(bd);
164 				bd->props.power = old_power;
171 	mutex_unlock(&bd->ops_lock);
180 	struct backlight_device *bd = to_backlight_device(dev);
182 	return sprintf(buf, "%d\n", bd->props.brightness);
185 int backlight_device_set_brightness(struct backlight_device *bd,
190 	mutex_lock(&bd->ops_lock);
191 	if (bd->ops) {
192 		if (brightness > bd->props.max_brightness)
196 			bd->props.brightness = brightness;
197 			rc = backlight_update_status(bd);
200 	mutex_unlock(&bd->ops_lock);
202 	backlight_generate_event(bd, BACKLIGHT_UPDATE_SYSFS);
212 	struct backlight_device *bd = to_backlight_device(dev);
219 	rc = backlight_device_set_brightness(bd, brightness);
228 	struct backlight_device *bd = to_backlight_device(dev);
230 	return sprintf(buf, "%s\n", backlight_types[bd->props.type]);
237 	struct backlight_device *bd = to_backlight_device(dev);
239 	return sprintf(buf, "%d\n", bd->props.max_brightness);
247 	struct backlight_device *bd = to_backlight_device(dev);
249 	mutex_lock(&bd->ops_lock);
250 	if (bd->ops && bd->ops->get_brightness) {
251 		rc = bd->ops->get_brightness(bd);
255 		rc = sprintf(buf, "%d\n", bd->props.brightness);
257 	mutex_unlock(&bd->ops_lock);
266 	struct backlight_device *bd = to_backlight_device(dev);
268 	if (WARN_ON(bd->props.scale > BACKLIGHT_SCALE_NON_LINEAR))
271 	return sprintf(buf, "%s\n", backlight_scale_types[bd->props.scale]);
278 	struct backlight_device *bd = to_backlight_device(dev);
280 	mutex_lock(&bd->ops_lock);
281 	if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) {
282 		bd->props.state |= BL_CORE_SUSPENDED;
283 		backlight_update_status(bd);
285 	mutex_unlock(&bd->ops_lock);
292 	struct backlight_device *bd = to_backlight_device(dev);
294 	mutex_lock(&bd->ops_lock);
295 	if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) {
296 		bd->props.state &= ~BL_CORE_SUSPENDED;
297 		backlight_update_status(bd);
299 	mutex_unlock(&bd->ops_lock);
310 	struct backlight_device *bd = to_backlight_device(dev);
311 	kfree(bd);
334  * @bd: the backlight device to update
343 void backlight_force_update(struct backlight_device *bd,
348 	mutex_lock(&bd->ops_lock);
349 	if (bd->ops && bd->ops->get_brightness) {
350 		brightness = bd->ops->get_brightness(bd);
352 			bd->props.brightness = brightness;
354 			dev_err(&bd->dev,
358 	mutex_unlock(&bd->ops_lock);
359 	backlight_generate_event(bd, reason);
433 	struct backlight_device *bd;
436 	list_for_each_entry(bd, &backlight_dev_list, entry) {
437 		if (bd->props.type == type) {
444 	return found ? bd : NULL;
470 void backlight_device_unregister(struct backlight_device *bd)
472 	if (!bd)
476 	list_del(&bd->entry);
481 	if (pmac_backlight == bd)
486 	mutex_lock(&bd->ops_lock);
487 	bd->ops = NULL;
488 	mutex_unlock(&bd->ops_lock);
490 	device_unregister(&bd->dev);
554  * @bd: the backlight device to unregister
561 				struct backlight_device *bd)
566 				devm_backlight_device_match, bd);
602 	struct backlight_device *bd = NULL;
611 			bd = of_find_backlight_by_node(np);
613 			if (!bd)
618 	return bd;
623 	struct backlight_device *bd = data;
625 	put_device(&bd->dev);
645 	struct backlight_device *bd;
648 	bd = of_find_backlight(dev);
649 	if (IS_ERR_OR_NULL(bd))
650 		return bd;
651 	ret = devm_add_action_or_reset(dev, devm_backlight_release, bd);
655 	return bd;