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 #define LOG_TAG "libsuspend"
18 
19 #include <stdbool.h>
20 
21 #include <log/log.h>
22 
23 #include <suspend/autosuspend.h>
24 
25 #include "autosuspend_ops.h"
26 
27 static struct autosuspend_ops *autosuspend_ops;
28 static bool autosuspend_enabled;
29 static bool autosuspend_inited;
30 
autosuspend_init(void)31 static int autosuspend_init(void)
32 {
33     if (autosuspend_inited) {
34         return 0;
35     }
36 
37     autosuspend_ops = autosuspend_wakeup_count_init();
38     if (autosuspend_ops) {
39         goto out;
40     }
41 
42     if (!autosuspend_ops) {
43         ALOGE("failed to initialize autosuspend\n");
44         return -1;
45     }
46 
47 out:
48     autosuspend_inited = true;
49 
50     ALOGV("autosuspend initialized\n");
51     return 0;
52 }
53 
autosuspend_enable(void)54 int autosuspend_enable(void)
55 {
56     int ret;
57 
58     ret = autosuspend_init();
59     if (ret) {
60         return ret;
61     }
62 
63     ALOGV("autosuspend_enable\n");
64 
65     if (autosuspend_enabled) {
66         return 0;
67     }
68 
69     ret = autosuspend_ops->enable();
70     if (ret) {
71         return ret;
72     }
73 
74     autosuspend_enabled = true;
75     return 0;
76 }
77 
autosuspend_disable(void)78 int autosuspend_disable(void)
79 {
80     int ret;
81 
82     ret = autosuspend_init();
83     if (ret) {
84         return ret;
85     }
86 
87     ALOGV("autosuspend_disable\n");
88 
89     if (!autosuspend_enabled) {
90         return 0;
91     }
92 
93     ret = autosuspend_ops->disable();
94     if (ret) {
95         return ret;
96     }
97 
98     autosuspend_enabled = false;
99     return 0;
100 }
101