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
|
/*
* power-manager
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __PM_X_LCD_ONOFF_C__
#define __PM_X_LCD_ONOFF_C__
#include <string.h>
#include <sys/wait.h>
#include <errno.h>
#define CMD_ON "on"
#define CMD_OFF "off"
static int pm_x_set_lcd_backlight(struct _PMSys *p, int onoff)
{
pid_t pid;
char cmd_line[32];
int ret;
LOGINFO("Backlight onoff=%d", onoff);
if (onoff == STATUS_ON)
snprintf(cmd_line, sizeof(cmd_line), "%s", CMD_ON);
else
snprintf(cmd_line, sizeof(cmd_line), "%s", CMD_OFF);
signal(SIGCHLD, SIG_DFL);
pid = vfork();
if (pid < 0) {
LOGERR("[1] Failed to fork child process for LCD On/Off");
return -1;
}
if (pid == 0) {
LOGINFO("[1] Child proccess for LCD %s was created (%s)",
((onoff == STATUS_ON) ? "ON" : "OFF"), cmd_line);
execl("/usr/bin/xset", "/usr/bin/xset", "dpms", "force",
cmd_line, NULL);
_exit(0);
} else if (pid != (ret = waitpid(pid, NULL, 0))) {
LOGERR
("[1] Waiting failed for the child process pid: %d, ret: %d, errno: %d",
pid, ret, errno);
}
signal(SIGCHLD, SIG_IGN);
return 0;
}
#endif /*__PM_X_LCD_ONOFF_C__ */
|
