linux/include/linux/lcd.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * LCD Lowlevel Control Abstraction
 *
 * Copyright (C) 2003,2004 Hewlett-Packard Company
 *
 */

#ifndef _LINUX_LCD_H
#define _LINUX_LCD_H

#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/fb.h>

/* Notes on locking:
 *
 * lcd_device->ops_lock is an internal backlight lock protecting the ops
 * field and no code outside the core should need to touch it.
 *
 * Access to set_power() is serialised by the update_lock mutex since
 * most drivers seem to need this and historically get it wrong.
 *
 * Most drivers don't need locking on their get_power() method.
 * If yours does, you need to implement it in the driver. You can use the
 * update_lock mutex if appropriate.
 *
 * Any other use of the locks below is probably wrong.
 */

struct lcd_device;
struct fb_info;

struct lcd_properties { … };

struct lcd_ops { … };

struct lcd_device { … };

struct lcd_platform_data { … };

static inline void lcd_set_power(struct lcd_device *ld, int power)
{ … }

extern struct lcd_device *lcd_device_register(const char *name,
	struct device *parent, void *devdata, const struct lcd_ops *ops);
extern struct lcd_device *devm_lcd_device_register(struct device *dev,
	const char *name, struct device *parent,
	void *devdata, const struct lcd_ops *ops);
extern void lcd_device_unregister(struct lcd_device *ld);
extern void devm_lcd_device_unregister(struct device *dev,
	struct lcd_device *ld);

#define to_lcd_device(obj) …

static inline void * lcd_get_data(struct lcd_device *ld_dev)
{ … }


#endif