1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2003,2004 Hewlett-Packard Company
43  * and if it is, we're switching lcd power as well ...
50 	struct fb_info *info = evdata->info;  in fb_notifier_callback()
53 	guard(mutex)(&ld->ops_lock);  in fb_notifier_callback()
55 	if (!ld->ops)  in fb_notifier_callback()
57 	if (ld->ops->controls_device && !ld->ops->controls_device(ld, info->device))  in fb_notifier_callback()
63 		int power = to_lcd_power(*(int *)evdata->data);  in fb_notifier_callback()  local
65 		if (ld->ops->set_power)  in fb_notifier_callback()
66 			ld->ops->set_power(ld, power);  in fb_notifier_callback()
68 		const struct fb_videomode *videomode = evdata->data;  in fb_notifier_callback()
70 		if (ld->ops->set_mode)  in fb_notifier_callback()
71 			ld->ops->set_mode(ld, videomode->xres, videomode->yres);  in fb_notifier_callback()
79 	memset(&ld->fb_notif, 0, sizeof(ld->fb_notif));  in lcd_register_fb()
80 	ld->fb_notif.notifier_call = fb_notifier_callback;  in lcd_register_fb()
81 	return fb_register_client(&ld->fb_notif);  in lcd_register_fb()
86 	fb_unregister_client(&ld->fb_notif);  in lcd_unregister_fb()
105 	mutex_lock(&ld->ops_lock);  in lcd_power_show()
106 	if (ld->ops && ld->ops->get_power)  in lcd_power_show()
107 		rc = sprintf(buf, "%d\n", ld->ops->get_power(ld));  in lcd_power_show()
109 		rc = -ENXIO;  in lcd_power_show()
110 	mutex_unlock(&ld->ops_lock);  in lcd_power_show()
120 	unsigned long power;  in lcd_power_store()  local
122 	rc = kstrtoul(buf, 0, &power);  in lcd_power_store()
126 	rc = -ENXIO;  in lcd_power_store()
128 	mutex_lock(&ld->ops_lock);  in lcd_power_store()
129 	if (ld->ops && ld->ops->set_power) {  in lcd_power_store()
130 		pr_debug("set power to %lu\n", power);  in lcd_power_store()
131 		ld->ops->set_power(ld, power);  in lcd_power_store()
134 	mutex_unlock(&ld->ops_lock);  in lcd_power_store()
143 	int rc = -ENXIO;  in contrast_show()
146 	mutex_lock(&ld->ops_lock);  in contrast_show()
147 	if (ld->ops && ld->ops->get_contrast)  in contrast_show()
148 		rc = sprintf(buf, "%d\n", ld->ops->get_contrast(ld));  in contrast_show()
149 	mutex_unlock(&ld->ops_lock);  in contrast_show()
165 	rc = -ENXIO;  in contrast_store()
167 	mutex_lock(&ld->ops_lock);  in contrast_store()
168 	if (ld->ops && ld->ops->set_contrast) {  in contrast_store()
170 		ld->ops->set_contrast(ld, contrast);  in contrast_store()
173 	mutex_unlock(&ld->ops_lock);  in contrast_store()
184 	return sprintf(buf, "%d\n", ld->props.max_contrast);  in max_contrast_show()
208  * lcd_device_register - register a new object of lcd_device class.
229 		return ERR_PTR(-ENOMEM);  in lcd_device_register()
231 	mutex_init(&new_ld->ops_lock);  in lcd_device_register()
232 	mutex_init(&new_ld->update_lock);  in lcd_device_register()
234 	new_ld->dev.class = &lcd_class;  in lcd_device_register()
235 	new_ld->dev.parent = parent;  in lcd_device_register()
236 	new_ld->dev.release = lcd_device_release;  in lcd_device_register()
237 	dev_set_name(&new_ld->dev, "%s", name);  in lcd_device_register()
238 	dev_set_drvdata(&new_ld->dev, devdata);  in lcd_device_register()
240 	new_ld->ops = ops;  in lcd_device_register()
242 	rc = device_register(&new_ld->dev);  in lcd_device_register()
244 		put_device(&new_ld->dev);  in lcd_device_register()
250 		device_unregister(&new_ld->dev);  in lcd_device_register()
259  * lcd_device_unregister - unregisters a object of lcd_device class.
269 	mutex_lock(&ld->ops_lock);  in lcd_device_unregister()
270 	ld->ops = NULL;  in lcd_device_unregister()
271 	mutex_unlock(&ld->ops_lock);  in lcd_device_unregister()
274 	device_unregister(&ld->dev);  in lcd_device_unregister()
293  * devm_lcd_device_register - resource managed lcd_device_register()
302  * Managed lcd_device_register(). The lcd_device returned from this function
314 		return ERR_PTR(-ENOMEM);  in devm_lcd_device_register()
329  * devm_lcd_device_unregister - resource managed lcd_device_unregister()