a2582c2c4d
libsuspend provides functions autosuspend_enable() and autosuspend_disable() to trigger suspend on a variety of different kernels. Change-Id: I5dc28fb51532fa7c514330f1cfde7698d31d734c
99 lines
2.4 KiB
C
99 lines
2.4 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/stat.h>
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#include <sys/types.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 SYS_POWER_AUTOSLEEP "/sys/power/autosleep"
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static int autosleep_fd;
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static const char *sleep_state = "mem";
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static const char *on_state = "off";
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static int autosuspend_autosleep_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_autosleep_enable\n");
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ret = write(autosleep_fd, sleep_state, strlen(sleep_state));
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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", SYS_POWER_AUTOSLEEP, buf);
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goto err;
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}
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ALOGV("autosuspend_autosleep_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_autosleep_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_autosleep_disable\n");
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ret = write(autosleep_fd, on_state, strlen(on_state));
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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", SYS_POWER_AUTOSLEEP, buf);
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goto err;
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}
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ALOGV("autosuspend_autosleep_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_autosleep_ops = {
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.enable = autosuspend_autosleep_enable,
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.disable = autosuspend_autosleep_disable,
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};
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struct autosuspend_ops *autosuspend_autosleep_init(void)
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{
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int ret;
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char buf[80];
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autosleep_fd = open(SYS_POWER_AUTOSLEEP, O_WRONLY);
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if (autosleep_fd < 0) {
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strerror_r(errno, buf, sizeof(buf));
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ALOGE("Error opening %s: %s\n", SYS_POWER_AUTOSLEEP, buf);
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return NULL;
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}
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ALOGI("Selected autosleep\n");
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return &autosuspend_autosleep_ops;
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}
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