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/*
* 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 <utils/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;
}
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