1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2003,2004 Hewlett-Packard Company
25  * and if it is, we're switching lcd power as well ...
34 	if (!ld->ops)  in fb_notifier_callback()
37 	mutex_lock(&ld->ops_lock);  in fb_notifier_callback()
38 	if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info)) {  in fb_notifier_callback()
40 			if (ld->ops->set_power)  in fb_notifier_callback()
41 				ld->ops->set_power(ld, *(int *)evdata->data);  in fb_notifier_callback()
43 			if (ld->ops->set_mode)  in fb_notifier_callback()
44 				ld->ops->set_mode(ld, evdata->data);  in fb_notifier_callback()
47 	mutex_unlock(&ld->ops_lock);  in fb_notifier_callback()
53 	memset(&ld->fb_notif, 0, sizeof(ld->fb_notif));  in lcd_register_fb()
54 	ld->fb_notif.notifier_call = fb_notifier_callback;  in lcd_register_fb()
55 	return fb_register_client(&ld->fb_notif);  in lcd_register_fb()
60 	fb_unregister_client(&ld->fb_notif);  in lcd_unregister_fb()
79 	mutex_lock(&ld->ops_lock);  in lcd_power_show()
80 	if (ld->ops && ld->ops->get_power)  in lcd_power_show()
81 		rc = sprintf(buf, "%d\n", ld->ops->get_power(ld));  in lcd_power_show()
83 		rc = -ENXIO;  in lcd_power_show()
84 	mutex_unlock(&ld->ops_lock);  in lcd_power_show()
94 	unsigned long power;  in lcd_power_store()  local
96 	rc = kstrtoul(buf, 0, &power);  in lcd_power_store()
100 	rc = -ENXIO;  in lcd_power_store()
102 	mutex_lock(&ld->ops_lock);  in lcd_power_store()
103 	if (ld->ops && ld->ops->set_power) {  in lcd_power_store()
104 		pr_debug("set power to %lu\n", power);  in lcd_power_store()
105 		ld->ops->set_power(ld, power);  in lcd_power_store()
108 	mutex_unlock(&ld->ops_lock);  in lcd_power_store()
117 	int rc = -ENXIO;  in contrast_show()
120 	mutex_lock(&ld->ops_lock);  in contrast_show()
121 	if (ld->ops && ld->ops->get_contrast)  in contrast_show()
122 		rc = sprintf(buf, "%d\n", ld->ops->get_contrast(ld));  in contrast_show()
123 	mutex_unlock(&ld->ops_lock);  in contrast_show()
139 	rc = -ENXIO;  in contrast_store()
141 	mutex_lock(&ld->ops_lock);  in contrast_store()
142 	if (ld->ops && ld->ops->set_contrast) {  in contrast_store()
144 		ld->ops->set_contrast(ld, contrast);  in contrast_store()
147 	mutex_unlock(&ld->ops_lock);  in contrast_store()
158 	return sprintf(buf, "%d\n", ld->props.max_contrast);  in max_contrast_show()
182  * lcd_device_register - register a new object of lcd_device class.
203 		return ERR_PTR(-ENOMEM);  in lcd_device_register()
205 	mutex_init(&new_ld->ops_lock);  in lcd_device_register()
206 	mutex_init(&new_ld->update_lock);  in lcd_device_register()
208 	new_ld->dev.class = &lcd_class;  in lcd_device_register()
209 	new_ld->dev.parent = parent;  in lcd_device_register()
210 	new_ld->dev.release = lcd_device_release;  in lcd_device_register()
211 	dev_set_name(&new_ld->dev, "%s", name);  in lcd_device_register()
212 	dev_set_drvdata(&new_ld->dev, devdata);  in lcd_device_register()
214 	new_ld->ops = ops;  in lcd_device_register()
216 	rc = device_register(&new_ld->dev);  in lcd_device_register()
218 		put_device(&new_ld->dev);  in lcd_device_register()
224 		device_unregister(&new_ld->dev);  in lcd_device_register()
233  * lcd_device_unregister - unregisters a object of lcd_device class.
243 	mutex_lock(&ld->ops_lock);  in lcd_device_unregister()
244 	ld->ops = NULL;  in lcd_device_unregister()
245 	mutex_unlock(&ld->ops_lock);  in lcd_device_unregister()
248 	device_unregister(&ld->dev);  in lcd_device_unregister()
267  * devm_lcd_device_register - resource managed lcd_device_register()
276  * Managed lcd_device_register(). The lcd_device returned from this function
288 		return ERR_PTR(-ENOMEM);  in devm_lcd_device_register()
303  * devm_lcd_device_unregister - resource managed lcd_device_unregister()