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/types.h> 22 #include <sys/stat.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 EARLYSUSPEND_SYS_POWER_STATE "/sys/power/state" 31 #define EARLYSUSPEND_WAIT_FOR_FB_SLEEP "/sys/power/wait_for_fb_sleep" 32 #define EARLYSUSPEND_WAIT_FOR_FB_WAKE "/sys/power/wait_for_fb_wake" 33 34 35 static int sPowerStatefd; 36 static const char *pwr_state_mem = "mem"; 37 static const char *pwr_state_on = "on"; 38 39 static int autosuspend_earlysuspend_enable(void) 40 { 41 char buf[80]; 42 int ret; 43 44 ALOGV("autosuspend_earlysuspend_enable\n"); 45 46 ret = write(sPowerStatefd, pwr_state_mem, strlen(pwr_state_mem)); 47 if (ret < 0) { 48 strerror_r(errno, buf, sizeof(buf)); 49 ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); 50 goto err; 51 } 52 53 ALOGV("autosuspend_earlysuspend_enable done\n"); 54 55 return 0; 56 57 err: 58 return ret; 59 } 60 61 static int autosuspend_earlysuspend_disable(void) 62 { 63 char buf[80]; 64 int ret; 65 66 ALOGV("autosuspend_earlysuspend_disable\n"); 67 68 ret = write(sPowerStatefd, pwr_state_on, strlen(pwr_state_on)); 69 if (ret < 0) { 70 strerror_r(errno, buf, sizeof(buf)); 71 ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); 72 goto err; 73 } 74 75 ALOGV("autosuspend_earlysuspend_disable done\n"); 76 77 return 0; 78 79 err: 80 return ret; 81 } 82 83 struct autosuspend_ops autosuspend_earlysuspend_ops = { 84 .enable = autosuspend_earlysuspend_enable, 85 .disable = autosuspend_earlysuspend_disable, 86 }; 87 88 struct autosuspend_ops *autosuspend_earlysuspend_init(void) 89 { 90 char buf[80]; 91 int ret; 92 93 ret = access(EARLYSUSPEND_WAIT_FOR_FB_SLEEP, F_OK); 94 if (ret < 0) { 95 return NULL; 96 } 97 98 ret = access(EARLYSUSPEND_WAIT_FOR_FB_WAKE, F_OK); 99 if (ret < 0) { 100 return NULL; 101 } 102 103 sPowerStatefd = open(EARLYSUSPEND_SYS_POWER_STATE, O_RDWR); 104 105 if (sPowerStatefd < 0) { 106 strerror_r(errno, buf, sizeof(buf)); 107 ALOGE("Error opening %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf); 108 return NULL; 109 } 110 111 ALOGI("Selected early suspend\n"); 112 return &autosuspend_earlysuspend_ops; 113 } 114
