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      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 <stdbool.h>
     18 
     19 #define LOG_TAG "libsuspend"
     20 #include <cutils/log.h>
     21 
     22 #include <suspend/autosuspend.h>
     23 
     24 #include "autosuspend_ops.h"
     25 
     26 static struct autosuspend_ops *autosuspend_ops;
     27 static bool autosuspend_enabled;
     28 static bool autosuspend_inited;
     29 
     30 static int autosuspend_init(void)
     31 {
     32     if (autosuspend_inited) {
     33         return 0;
     34     }
     35 
     36     autosuspend_ops = autosuspend_earlysuspend_init();
     37     if (autosuspend_ops) {
     38         goto out;
     39     }
     40 
     41 /* Remove autosleep so userspace can manager suspend/resume and keep stats */
     42 #if 0
     43     autosuspend_ops = autosuspend_autosleep_init();
     44     if (autosuspend_ops) {
     45         goto out;
     46     }
     47 #endif
     48 
     49     autosuspend_ops = autosuspend_wakeup_count_init();
     50     if (autosuspend_ops) {
     51         goto out;
     52     }
     53 
     54     if (!autosuspend_ops) {
     55         ALOGE("failed to initialize autosuspend\n");
     56         return -1;
     57     }
     58 
     59 out:
     60     autosuspend_inited = true;
     61 
     62     ALOGV("autosuspend initialized\n");
     63     return 0;
     64 }
     65 
     66 int autosuspend_enable(void)
     67 {
     68     int ret;
     69 
     70     ret = autosuspend_init();
     71     if (ret) {
     72         return ret;
     73     }
     74 
     75     ALOGV("autosuspend_enable\n");
     76 
     77     if (autosuspend_enabled) {
     78         return 0;
     79     }
     80 
     81     ret = autosuspend_ops->enable();
     82     if (ret) {
     83         return ret;
     84     }
     85 
     86     autosuspend_enabled = true;
     87     return 0;
     88 }
     89 
     90 int autosuspend_disable(void)
     91 {
     92     int ret;
     93 
     94     ret = autosuspend_init();
     95     if (ret) {
     96         return ret;
     97     }
     98 
     99     ALOGV("autosuspend_disable\n");
    100 
    101     if (!autosuspend_enabled) {
    102         return 0;
    103     }
    104 
    105     ret = autosuspend_ops->disable();
    106     if (ret) {
    107         return ret;
    108     }
    109 
    110     autosuspend_enabled = false;
    111     return 0;
    112 }
    113