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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/types.h>
#include <sys/stat.h>
#include <unistd.h>
#define LOG_TAG "libsuspend"
#include <cutils/log.h>
#include "autosuspend_ops.h"
#define EARLYSUSPEND_SYS_POWER_STATE "/sys/power/state"
#define EARLYSUSPEND_WAIT_FOR_FB_SLEEP "/sys/power/wait_for_fb_sleep"
#define EARLYSUSPEND_WAIT_FOR_FB_WAKE "/sys/power/wait_for_fb_wake"
static int sPowerStatefd;
static const char *pwr_state_mem = "mem";
static const char *pwr_state_on = "on";
static int autosuspend_earlysuspend_enable(void)
{
char buf[80];
int ret;
ALOGV("autosuspend_earlysuspend_enable\n");
ret = write(sPowerStatefd, pwr_state_mem, strlen(pwr_state_mem));
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
goto err;
}
ALOGV("autosuspend_earlysuspend_enable done\n");
return 0;
err:
return ret;
}
static int autosuspend_earlysuspend_disable(void)
{
char buf[80];
int ret;
ALOGV("autosuspend_earlysuspend_disable\n");
ret = write(sPowerStatefd, pwr_state_on, strlen(pwr_state_on));
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
goto err;
}
ALOGV("autosuspend_earlysuspend_disable done\n");
return 0;
err:
return ret;
}
struct autosuspend_ops autosuspend_earlysuspend_ops = {
.enable = autosuspend_earlysuspend_enable,
.disable = autosuspend_earlysuspend_disable,
};
struct autosuspend_ops *autosuspend_earlysuspend_init(void)
{
char buf[80];
int ret;
ret = access(EARLYSUSPEND_WAIT_FOR_FB_SLEEP, F_OK);
if (ret < 0) {
return NULL;
}
ret = access(EARLYSUSPEND_WAIT_FOR_FB_WAKE, F_OK);
if (ret < 0) {
return NULL;
}
sPowerStatefd = open(EARLYSUSPEND_SYS_POWER_STATE, O_RDWR);
if (sPowerStatefd < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
return NULL;
}
ALOGI("Selected early suspend\n");
return &autosuspend_earlysuspend_ops;
}
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