114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#define LOG_TAG "libsuspend"
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#include <cutils/log.h>
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#include "autosuspend_ops.h"
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#define EARLYSUSPEND_SYS_POWER_STATE "/sys/power/state"
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#define EARLYSUSPEND_WAIT_FOR_FB_SLEEP "/sys/power/wait_for_fb_sleep"
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#define EARLYSUSPEND_WAIT_FOR_FB_WAKE "/sys/power/wait_for_fb_wake"
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static int sPowerStatefd;
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static const char *pwr_state_mem = "mem";
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static const char *pwr_state_on = "on";
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static int autosuspend_earlysuspend_enable(void)
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{
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char buf[80];
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int ret;
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ALOGV("autosuspend_earlysuspend_enable\n");
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ret = write(sPowerStatefd, pwr_state_mem, strlen(pwr_state_mem));
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if (ret < 0) {
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strerror_r(errno, buf, sizeof(buf));
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ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
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goto err;
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}
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ALOGV("autosuspend_earlysuspend_enable done\n");
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return 0;
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err:
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return ret;
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}
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static int autosuspend_earlysuspend_disable(void)
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{
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char buf[80];
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int ret;
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ALOGV("autosuspend_earlysuspend_disable\n");
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ret = write(sPowerStatefd, pwr_state_on, strlen(pwr_state_on));
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if (ret < 0) {
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strerror_r(errno, buf, sizeof(buf));
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ALOGE("Error writing to %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
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goto err;
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}
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ALOGV("autosuspend_earlysuspend_disable done\n");
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return 0;
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err:
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return ret;
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}
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struct autosuspend_ops autosuspend_earlysuspend_ops = {
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.enable = autosuspend_earlysuspend_enable,
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.disable = autosuspend_earlysuspend_disable,
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};
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struct autosuspend_ops *autosuspend_earlysuspend_init(void)
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{
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char buf[80];
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int ret;
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ret = access(EARLYSUSPEND_WAIT_FOR_FB_SLEEP, F_OK);
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if (ret < 0) {
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return NULL;
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}
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ret = access(EARLYSUSPEND_WAIT_FOR_FB_WAKE, F_OK);
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if (ret < 0) {
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return NULL;
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}
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sPowerStatefd = open(EARLYSUSPEND_SYS_POWER_STATE, O_RDWR);
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if (sPowerStatefd < 0) {
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strerror_r(errno, buf, sizeof(buf));
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ALOGE("Error opening %s: %s\n", EARLYSUSPEND_SYS_POWER_STATE, buf);
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return NULL;
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}
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ALOGI("Selected early suspend\n");
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return &autosuspend_earlysuspend_ops;
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}
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