1/*-
2 * Copyright (c) 2020 The FreeBSD Foundation
3 *
4 * This software was developed by Emmanuel Vadot under sponsorship
5 * from the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#ifndef _LINUX_BACKLIGHT_H_
32#define _LINUX_BACKLIGHT_H_
33
34#include <linux/notifier.h>
35
36struct backlight_device;
37
38enum backlight_type {
39	BACKLIGHT_RAW = 0,
40};
41
42struct backlight_properties {
43	int type;
44	int max_brightness;
45	int brightness;
46	int power;
47};
48
49enum backlight_notification {
50	BACKLIGHT_REGISTERED,
51	BACKLIGHT_UNREGISTERED,
52};
53
54enum backlight_update_reason {
55	BACKLIGHT_UPDATE_HOTKEY = 0
56};
57
58struct backlight_ops {
59	int options;
60#define	BL_CORE_SUSPENDRESUME   1
61	int (*update_status)(struct backlight_device *);
62	int (*get_brightness)(struct backlight_device *);
63};
64
65struct backlight_device {
66	const struct backlight_ops *ops;
67	struct backlight_properties props;
68	void *data;
69	struct device *dev;
70	char *name;
71};
72
73#define bl_get_data(bd) (bd)->data
74
75struct backlight_device *linux_backlight_device_register(const char *name,
76    struct device *dev, void *data, const struct backlight_ops *ops, struct backlight_properties *props);
77void linux_backlight_device_unregister(struct backlight_device *bd);
78#define	backlight_device_register(name, dev, data, ops, props)	\
79	linux_backlight_device_register(name, dev, data, ops, props)
80#define	backlight_device_unregister(bd)	linux_backlight_device_unregister(bd)
81
82static inline void
83backlight_update_status(struct backlight_device *bd)
84{
85	bd->ops->update_status(bd);
86}
87
88static inline void
89backlight_force_update(struct backlight_device *bd, int reason)
90{
91	bd->props.brightness = bd->ops->get_brightness(bd);
92}
93
94#endif	/* _LINUX_BACKLIGHT_H_ */
95