1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <stddef.h>
20 #include <string.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <unistd.h>
24
25 #define LOG_TAG "libsuspend"
26 #include <cutils/log.h>
27
28 #include "autosuspend_ops.h"
29
30 #define SYS_POWER_AUTOSLEEP "/sys/power/autosleep"
31
32 static int autosleep_fd;
33 static const char *sleep_state = "mem";
34 static const char *on_state = "off";
35
autosuspend_autosleep_enable(void)36 static int autosuspend_autosleep_enable(void)
37 {
38 char buf[80];
39 int ret;
40
41 ALOGV("autosuspend_autosleep_enable\n");
42
43 ret = write(autosleep_fd, sleep_state, strlen(sleep_state));
44 if (ret < 0) {
45 strerror_r(errno, buf, sizeof(buf));
46 ALOGE("Error writing to %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
47 goto err;
48 }
49
50 ALOGV("autosuspend_autosleep_enable done\n");
51
52 return 0;
53
54 err:
55 return ret;
56 }
57
autosuspend_autosleep_disable(void)58 static int autosuspend_autosleep_disable(void)
59 {
60 char buf[80];
61 int ret;
62
63 ALOGV("autosuspend_autosleep_disable\n");
64
65 ret = write(autosleep_fd, on_state, strlen(on_state));
66 if (ret < 0) {
67 strerror_r(errno, buf, sizeof(buf));
68 ALOGE("Error writing to %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
69 goto err;
70 }
71
72 ALOGV("autosuspend_autosleep_disable done\n");
73
74 return 0;
75
76 err:
77 return ret;
78 }
79
80 struct autosuspend_ops autosuspend_autosleep_ops = {
81 .enable = autosuspend_autosleep_enable,
82 .disable = autosuspend_autosleep_disable,
83 };
84
autosuspend_autosleep_init(void)85 struct autosuspend_ops *autosuspend_autosleep_init(void)
86 {
87 int ret;
88 char buf[80];
89
90 autosleep_fd = open(SYS_POWER_AUTOSLEEP, O_WRONLY);
91 if (autosleep_fd < 0) {
92 strerror_r(errno, buf, sizeof(buf));
93 ALOGE("Error opening %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
94 return NULL;
95 }
96
97 ALOGI("Selected autosleep\n");
98
99 autosuspend_autosleep_disable();
100
101 return &autosuspend_autosleep_ops;
102 }
103