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/*
* Copyright (C) 2012 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 <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#define LOG_TAG "libsuspend"
#include <cutils/log.h>
#include "autosuspend_ops.h"
#define SYS_POWER_AUTOSLEEP "/sys/power/autosleep"
static int autosleep_fd;
static const char *sleep_state = "mem";
static const char *on_state = "off";
static int autosuspend_autosleep_enable(void)
{
char buf[80];
int ret;
ALOGV("autosuspend_autosleep_enable\n");
ret = TEMP_FAILURE_RETRY(write(autosleep_fd, sleep_state, strlen(sleep_state)));
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
goto err;
}
ALOGV("autosuspend_autosleep_enable done\n");
return 0;
err:
return ret;
}
static int autosuspend_autosleep_disable(void)
{
char buf[80];
int ret;
ALOGV("autosuspend_autosleep_disable\n");
ret = TEMP_FAILURE_RETRY(write(autosleep_fd, on_state, strlen(on_state)));
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
goto err;
}
ALOGV("autosuspend_autosleep_disable done\n");
return 0;
err:
return ret;
}
struct autosuspend_ops autosuspend_autosleep_ops = {
.enable = autosuspend_autosleep_enable,
.disable = autosuspend_autosleep_disable,
};
struct autosuspend_ops *autosuspend_autosleep_init(void)
{
char buf[80];
autosleep_fd = TEMP_FAILURE_RETRY(open(SYS_POWER_AUTOSLEEP, O_WRONLY));
if (autosleep_fd < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
return NULL;
}
ALOGI("Selected autosleep\n");
autosuspend_autosleep_disable();
return &autosuspend_autosleep_ops;
}
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