Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 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 <pthread.h> |
| 20 | #include <semaphore.h> |
| 21 | #include <stddef.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <unistd.h> |
| 26 | |
| 27 | #define LOG_TAG "libsuspend" |
Dianne Hackborn | 9552cdf | 2014-03-07 11:00:39 -0800 | [diff] [blame] | 28 | //#define LOG_NDEBUG 0 |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 29 | #include <cutils/log.h> |
| 30 | |
| 31 | #include "autosuspend_ops.h" |
| 32 | |
| 33 | #define SYS_POWER_STATE "/sys/power/state" |
| 34 | #define SYS_POWER_WAKEUP_COUNT "/sys/power/wakeup_count" |
| 35 | |
| 36 | static int state_fd; |
| 37 | static int wakeup_count_fd; |
| 38 | static pthread_t suspend_thread; |
| 39 | static sem_t suspend_lockout; |
| 40 | static const char *sleep_state = "mem"; |
Dianne Hackborn | 9552cdf | 2014-03-07 11:00:39 -0800 | [diff] [blame] | 41 | static void (*wakeup_func)(void) = NULL; |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 42 | |
Edwin Vane | 62f9ffa | 2012-07-26 15:26:46 -0400 | [diff] [blame] | 43 | static void *suspend_thread_func(void *arg __attribute__((unused))) |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 44 | { |
| 45 | char buf[80]; |
| 46 | char wakeup_count[20]; |
| 47 | int wakeup_count_len; |
| 48 | int ret; |
| 49 | |
| 50 | while (1) { |
| 51 | usleep(100000); |
| 52 | ALOGV("%s: read wakeup_count\n", __func__); |
| 53 | lseek(wakeup_count_fd, 0, SEEK_SET); |
| 54 | wakeup_count_len = read(wakeup_count_fd, wakeup_count, sizeof(wakeup_count)); |
| 55 | if (wakeup_count_len < 0) { |
| 56 | strerror_r(errno, buf, sizeof(buf)); |
| 57 | ALOGE("Error reading from %s: %s\n", SYS_POWER_WAKEUP_COUNT, buf); |
| 58 | wakeup_count_len = 0; |
| 59 | continue; |
| 60 | } |
| 61 | if (!wakeup_count_len) { |
| 62 | ALOGE("Empty wakeup count\n"); |
| 63 | continue; |
| 64 | } |
| 65 | |
| 66 | ALOGV("%s: wait\n", __func__); |
| 67 | ret = sem_wait(&suspend_lockout); |
| 68 | if (ret < 0) { |
| 69 | strerror_r(errno, buf, sizeof(buf)); |
| 70 | ALOGE("Error waiting on semaphore: %s\n", buf); |
| 71 | continue; |
| 72 | } |
| 73 | |
| 74 | ALOGV("%s: write %*s to wakeup_count\n", __func__, wakeup_count_len, wakeup_count); |
| 75 | ret = write(wakeup_count_fd, wakeup_count, wakeup_count_len); |
| 76 | if (ret < 0) { |
| 77 | strerror_r(errno, buf, sizeof(buf)); |
| 78 | ALOGE("Error writing to %s: %s\n", SYS_POWER_WAKEUP_COUNT, buf); |
| 79 | } else { |
| 80 | ALOGV("%s: write %s to %s\n", __func__, sleep_state, SYS_POWER_STATE); |
| 81 | ret = write(state_fd, sleep_state, strlen(sleep_state)); |
| 82 | if (ret < 0) { |
| 83 | strerror_r(errno, buf, sizeof(buf)); |
| 84 | ALOGE("Error writing to %s: %s\n", SYS_POWER_STATE, buf); |
Dianne Hackborn | 9552cdf | 2014-03-07 11:00:39 -0800 | [diff] [blame] | 85 | } else { |
| 86 | void (*func)(void) = wakeup_func; |
| 87 | if (func != NULL) { |
| 88 | (*func)(); |
| 89 | } |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 90 | } |
| 91 | } |
| 92 | |
| 93 | ALOGV("%s: release sem\n", __func__); |
| 94 | ret = sem_post(&suspend_lockout); |
| 95 | if (ret < 0) { |
| 96 | strerror_r(errno, buf, sizeof(buf)); |
| 97 | ALOGE("Error releasing semaphore: %s\n", buf); |
| 98 | } |
| 99 | } |
| 100 | return NULL; |
| 101 | } |
| 102 | |
| 103 | static int autosuspend_wakeup_count_enable(void) |
| 104 | { |
| 105 | char buf[80]; |
| 106 | int ret; |
| 107 | |
| 108 | ALOGV("autosuspend_wakeup_count_enable\n"); |
| 109 | |
| 110 | ret = sem_post(&suspend_lockout); |
| 111 | |
| 112 | if (ret < 0) { |
| 113 | strerror_r(errno, buf, sizeof(buf)); |
| 114 | ALOGE("Error changing semaphore: %s\n", buf); |
| 115 | } |
| 116 | |
| 117 | ALOGV("autosuspend_wakeup_count_enable done\n"); |
| 118 | |
| 119 | return ret; |
| 120 | } |
| 121 | |
| 122 | static int autosuspend_wakeup_count_disable(void) |
| 123 | { |
| 124 | char buf[80]; |
| 125 | int ret; |
| 126 | |
| 127 | ALOGV("autosuspend_wakeup_count_disable\n"); |
| 128 | |
| 129 | ret = sem_wait(&suspend_lockout); |
| 130 | |
| 131 | if (ret < 0) { |
| 132 | strerror_r(errno, buf, sizeof(buf)); |
| 133 | ALOGE("Error changing semaphore: %s\n", buf); |
| 134 | } |
| 135 | |
| 136 | ALOGV("autosuspend_wakeup_count_disable done\n"); |
| 137 | |
| 138 | return ret; |
| 139 | } |
| 140 | |
Dianne Hackborn | 9552cdf | 2014-03-07 11:00:39 -0800 | [diff] [blame] | 141 | void set_wakeup_callback(void (*func)(void)) |
| 142 | { |
| 143 | if (wakeup_func != NULL) { |
| 144 | ALOGE("Duplicate wakeup callback applied, keeping original"); |
| 145 | return; |
| 146 | } |
| 147 | wakeup_func = func; |
| 148 | } |
| 149 | |
Colin Cross | a2582c2 | 2012-05-03 17:30:16 -0700 | [diff] [blame] | 150 | struct autosuspend_ops autosuspend_wakeup_count_ops = { |
| 151 | .enable = autosuspend_wakeup_count_enable, |
| 152 | .disable = autosuspend_wakeup_count_disable, |
| 153 | }; |
| 154 | |
| 155 | struct autosuspend_ops *autosuspend_wakeup_count_init(void) |
| 156 | { |
| 157 | int ret; |
| 158 | char buf[80]; |
| 159 | |
| 160 | state_fd = open(SYS_POWER_STATE, O_RDWR); |
| 161 | if (state_fd < 0) { |
| 162 | strerror_r(errno, buf, sizeof(buf)); |
| 163 | ALOGE("Error opening %s: %s\n", SYS_POWER_STATE, buf); |
| 164 | goto err_open_state; |
| 165 | } |
| 166 | |
| 167 | wakeup_count_fd = open(SYS_POWER_WAKEUP_COUNT, O_RDWR); |
| 168 | if (wakeup_count_fd < 0) { |
| 169 | strerror_r(errno, buf, sizeof(buf)); |
| 170 | ALOGE("Error opening %s: %s\n", SYS_POWER_WAKEUP_COUNT, buf); |
| 171 | goto err_open_wakeup_count; |
| 172 | } |
| 173 | |
| 174 | ret = sem_init(&suspend_lockout, 0, 0); |
| 175 | if (ret < 0) { |
| 176 | strerror_r(errno, buf, sizeof(buf)); |
| 177 | ALOGE("Error creating semaphore: %s\n", buf); |
| 178 | goto err_sem_init; |
| 179 | } |
| 180 | ret = pthread_create(&suspend_thread, NULL, suspend_thread_func, NULL); |
| 181 | if (ret) { |
| 182 | strerror_r(ret, buf, sizeof(buf)); |
| 183 | ALOGE("Error creating thread: %s\n", buf); |
| 184 | goto err_pthread_create; |
| 185 | } |
| 186 | |
| 187 | ALOGI("Selected wakeup count\n"); |
| 188 | return &autosuspend_wakeup_count_ops; |
| 189 | |
| 190 | err_pthread_create: |
| 191 | sem_destroy(&suspend_lockout); |
| 192 | err_sem_init: |
| 193 | close(wakeup_count_fd); |
| 194 | err_open_wakeup_count: |
| 195 | close(state_fd); |
| 196 | err_open_state: |
| 197 | return NULL; |
| 198 | } |