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Diffstat (limited to 'libsuspend/autosuspend_autosleep.c')
-rw-r--r--libsuspend/autosuspend_autosleep.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/libsuspend/autosuspend_autosleep.c b/libsuspend/autosuspend_autosleep.c
new file mode 100644
index 000000000..dd0dfefe7
--- /dev/null
+++ b/libsuspend/autosuspend_autosleep.c
@@ -0,0 +1,99 @@
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
32static int autosleep_fd;
33static const char *sleep_state = "mem";
34static const char *on_state = "off";
35
36static 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
54err:
55 return ret;
56}
57
58static 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
76err:
77 return ret;
78}
79
80struct autosuspend_ops autosuspend_autosleep_ops = {
81 .enable = autosuspend_autosleep_enable,
82 .disable = autosuspend_autosleep_disable,
83};
84
85struct 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 return &autosuspend_autosleep_ops;
99}