1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*-
* Copyright (c) 2020 The FreeBSD Foundation
*
* This software was developed by Emmanuel Vadot under sponsorship
* from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_BACKLIGHT_H_
#define _LINUXKPI_LINUX_BACKLIGHT_H_
#include <linux/notifier.h>
struct backlight_device;
enum backlight_type {
BACKLIGHT_RAW = 0,
};
struct backlight_properties {
int type;
int max_brightness;
int brightness;
int power;
};
enum backlight_notification {
BACKLIGHT_REGISTERED,
BACKLIGHT_UNREGISTERED,
};
enum backlight_update_reason {
BACKLIGHT_UPDATE_HOTKEY = 0
};
struct backlight_ops {
int options;
#define BL_CORE_SUSPENDRESUME 1
int (*update_status)(struct backlight_device *);
int (*get_brightness)(struct backlight_device *);
};
struct backlight_device {
const struct backlight_ops *ops;
struct backlight_properties props;
void *data;
struct device *dev;
char *name;
};
#define bl_get_data(bd) (bd)->data
struct backlight_device *linux_backlight_device_register(const char *name,
struct device *dev, void *data, const struct backlight_ops *ops, struct backlight_properties *props);
void linux_backlight_device_unregister(struct backlight_device *bd);
#define backlight_device_register(name, dev, data, ops, props) \
linux_backlight_device_register(name, dev, data, ops, props)
#define backlight_device_unregister(bd) linux_backlight_device_unregister(bd)
static inline int
backlight_update_status(struct backlight_device *bd)
{
return (bd->ops->update_status(bd));
}
static inline void
backlight_force_update(struct backlight_device *bd, int reason)
{
bd->props.brightness = bd->ops->get_brightness(bd);
}
static inline int
backlight_get_brightness(struct backlight_device *bd)
{
return (bd->props.brightness);
}
static inline int
backlight_device_set_brightness(struct backlight_device *bd, int brightness)
{
if (brightness > bd->props.max_brightness)
return (EINVAL);
bd->props.brightness = brightness;
return (bd->ops->update_status(bd));
}
static inline int
backlight_enable(struct backlight_device *bd)
{
if (bd == NULL)
return (0);
bd->props.power = 0/* FB_BLANK_UNBLANK */;
return (backlight_update_status(bd));
}
static inline int
backlight_disable(struct backlight_device *bd)
{
if (bd == NULL)
return (0);
bd->props.power = 4/* FB_BLANK_POWERDOWN */;
return (backlight_update_status(bd));
}
static inline bool
backlight_is_blank(struct backlight_device *bd)
{
return (bd->props.power != 0/* FB_BLANK_UNBLANK */);
}
#endif /* _LINUXKPI_LINUX_BACKLIGHT_H_ */
|
