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 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 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 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
