| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #include <hardware_legacy/power.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <pthread.h> |
| |
| #define LOG_TAG "power" |
| #include <log/log.h> |
| |
| enum { |
| ACQUIRE_PARTIAL_WAKE_LOCK = 0, |
| RELEASE_WAKE_LOCK, |
| OUR_FD_COUNT |
| }; |
| |
| const char * const OLD_PATHS[] = { |
| "/sys/android_power/acquire_partial_wake_lock", |
| "/sys/android_power/release_wake_lock", |
| }; |
| |
| const char * const NEW_PATHS[] = { |
| "/sys/power/wake_lock", |
| "/sys/power/wake_unlock", |
| }; |
| |
| //XXX static pthread_once_t g_initialized = THREAD_ONCE_INIT; |
| static int g_initialized = 0; |
| static int g_fds[OUR_FD_COUNT]; |
| static int g_error = -1; |
| |
| static int |
| open_file_descriptors(const char * const paths[]) |
| { |
| int i; |
| for (i=0; i<OUR_FD_COUNT; i++) { |
| int fd = open(paths[i], O_RDWR | O_CLOEXEC); |
| if (fd < 0) { |
| g_error = -errno; |
| fprintf(stderr, "fatal error opening \"%s\": %s\n", paths[i], |
| strerror(errno)); |
| return -1; |
| } |
| g_fds[i] = fd; |
| } |
| |
| g_error = 0; |
| return 0; |
| } |
| |
| static inline void |
| initialize_fds(void) |
| { |
| // XXX: should be this: |
| //pthread_once(&g_initialized, open_file_descriptors); |
| // XXX: not this: |
| if (g_initialized == 0) { |
| if(open_file_descriptors(NEW_PATHS) < 0) |
| open_file_descriptors(OLD_PATHS); |
| g_initialized = 1; |
| } |
| } |
| |
| int |
| acquire_wake_lock(int lock, const char* id) |
| { |
| initialize_fds(); |
| |
| // ALOGI("acquire_wake_lock lock=%d id='%s'\n", lock, id); |
| |
| if (g_error) return g_error; |
| |
| int fd; |
| size_t len; |
| ssize_t ret; |
| |
| if (lock != PARTIAL_WAKE_LOCK) { |
| return -EINVAL; |
| } |
| |
| fd = g_fds[ACQUIRE_PARTIAL_WAKE_LOCK]; |
| |
| ret = write(fd, id, strlen(id)); |
| if (ret < 0) { |
| return -errno; |
| } |
| |
| return ret; |
| } |
| |
| int |
| release_wake_lock(const char* id) |
| { |
| initialize_fds(); |
| |
| // ALOGI("release_wake_lock id='%s'\n", id); |
| |
| if (g_error) return g_error; |
| |
| ssize_t len = write(g_fds[RELEASE_WAKE_LOCK], id, strlen(id)); |
| if (len < 0) { |
| return -errno; |
| } |
| return len; |
| } |