Merge "libsuspend: create new library to handle triggering suspend" into jb-dev

This commit is contained in:
Colin Cross 2012-05-07 16:00:19 -07:00 committed by Android (Google) Code Review
commit 0e92b50f0f
7 changed files with 603 additions and 0 deletions

23
libsuspend/Android.mk Normal file
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# Copyright 2012 The Android Open Source Project
LOCAL_PATH:= $(call my-dir)
libsuspend_src_files := \
autosuspend.c \
autosuspend_autosleep.c \
autosuspend_earlysuspend.c \
autosuspend_wakeup_count.c \
libsuspend_libraries := \
liblog libcutils
include $(CLEAR_VARS)
LOCAL_SRC_FILES := $(libsuspend_src_files)
LOCAL_MODULE := libsuspend
LOCAL_MODULE_TAGS := optional
LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include
LOCAL_SHARED_LIBRARIES := $(libsuspend_libraries)
#LOCAL_CFLAGS += -DLOG_NDEBUG=0
include $(BUILD_SHARED_LIBRARY)

109
libsuspend/autosuspend.c Normal file
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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 <stdbool.h>
#define LOG_TAG "libsuspend"
#include <cutils/log.h>
#include <suspend/autosuspend.h>
#include "autosuspend_ops.h"
static struct autosuspend_ops *autosuspend_ops;
static bool autosuspend_enabled;
static bool autosuspend_inited;
static int autosuspend_init(void)
{
if (autosuspend_inited) {
return 0;
}
autosuspend_inited = true;
autosuspend_ops = autosuspend_earlysuspend_init();
if (autosuspend_ops) {
goto out;
}
autosuspend_ops = autosuspend_autosleep_init();
if (autosuspend_ops) {
goto out;
}
autosuspend_ops = autosuspend_wakeup_count_init();
if (autosuspend_ops) {
goto out;
}
if (!autosuspend_ops) {
ALOGE("failed to initialize autosuspend\n");
return -1;
}
out:
ALOGV("autosuspend initialized\n");
return 0;
}
int autosuspend_enable(void)
{
int ret;
ret = autosuspend_init();
if (ret) {
return ret;
}
ALOGV("autosuspend_enable\n");
if (autosuspend_enabled) {
return 0;
}
ret = autosuspend_ops->enable();
if (ret) {
return ret;
}
autosuspend_enabled = true;
return 0;
}
int autosuspend_disable(void)
{
int ret;
ret = autosuspend_init();
if (ret) {
return ret;
}
ALOGV("autosuspend_disable\n");
if (!autosuspend_enabled) {
return 0;
}
ret = autosuspend_ops->disable();
if (ret) {
return ret;
}
autosuspend_enabled = false;
return 0;
}

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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 = 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 = 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)
{
int ret;
char buf[80];
autosleep_fd = 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");
return &autosuspend_autosleep_ops;
}

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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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/*
* 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.
*/
#ifndef _LIBSUSPEND_AUTOSUSPEND_OPS_H_
#define _LIBSUSPEND_AUTOSUSPEND_OPS_H_
struct autosuspend_ops {
int (*enable)(void);
int (*disable)(void);
};
struct autosuspend_ops *autosuspend_autosleep_init(void);
struct autosuspend_ops *autosuspend_earlysuspend_init(void);
struct autosuspend_ops *autosuspend_wakeup_count_init(void);
#endif

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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 <pthread.h>
#include <semaphore.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_STATE "/sys/power/state"
#define SYS_POWER_WAKEUP_COUNT "/sys/power/wakeup_count"
static int state_fd;
static int wakeup_count_fd;
static pthread_t suspend_thread;
static sem_t suspend_lockout;
static const char *sleep_state = "mem";
static void *suspend_thread_func(void *arg)
{
char buf[80];
char wakeup_count[20];
int wakeup_count_len;
int ret;
while (1) {
usleep(100000);
ALOGV("%s: read wakeup_count\n", __func__);
lseek(wakeup_count_fd, 0, SEEK_SET);
wakeup_count_len = read(wakeup_count_fd, wakeup_count, sizeof(wakeup_count));
if (wakeup_count_len < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error reading from %s: %s\n", SYS_POWER_WAKEUP_COUNT, buf);
wakeup_count_len = 0;
continue;
}
if (!wakeup_count_len) {
ALOGE("Empty wakeup count\n");
continue;
}
ALOGV("%s: wait\n", __func__);
ret = sem_wait(&suspend_lockout);
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error waiting on semaphore: %s\n", buf);
continue;
}
ALOGV("%s: write %*s to wakeup_count\n", __func__, wakeup_count_len, wakeup_count);
ret = write(wakeup_count_fd, wakeup_count, wakeup_count_len);
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", SYS_POWER_WAKEUP_COUNT, buf);
} else {
ALOGV("%s: write %s to %s\n", __func__, sleep_state, SYS_POWER_STATE);
ret = write(state_fd, sleep_state, strlen(sleep_state));
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error writing to %s: %s\n", SYS_POWER_STATE, buf);
}
}
ALOGV("%s: release sem\n", __func__);
ret = sem_post(&suspend_lockout);
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error releasing semaphore: %s\n", buf);
}
}
return NULL;
}
static int autosuspend_wakeup_count_enable(void)
{
char buf[80];
int ret;
ALOGV("autosuspend_wakeup_count_enable\n");
ret = sem_post(&suspend_lockout);
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error changing semaphore: %s\n", buf);
}
ALOGV("autosuspend_wakeup_count_enable done\n");
return ret;
}
static int autosuspend_wakeup_count_disable(void)
{
char buf[80];
int ret;
ALOGV("autosuspend_wakeup_count_disable\n");
ret = sem_wait(&suspend_lockout);
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error changing semaphore: %s\n", buf);
}
ALOGV("autosuspend_wakeup_count_disable done\n");
return ret;
}
struct autosuspend_ops autosuspend_wakeup_count_ops = {
.enable = autosuspend_wakeup_count_enable,
.disable = autosuspend_wakeup_count_disable,
};
struct autosuspend_ops *autosuspend_wakeup_count_init(void)
{
int ret;
char buf[80];
state_fd = open(SYS_POWER_STATE, O_RDWR);
if (state_fd < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", SYS_POWER_STATE, buf);
goto err_open_state;
}
wakeup_count_fd = open(SYS_POWER_WAKEUP_COUNT, O_RDWR);
if (wakeup_count_fd < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error opening %s: %s\n", SYS_POWER_WAKEUP_COUNT, buf);
goto err_open_wakeup_count;
}
ret = sem_init(&suspend_lockout, 0, 0);
if (ret < 0) {
strerror_r(errno, buf, sizeof(buf));
ALOGE("Error creating semaphore: %s\n", buf);
goto err_sem_init;
}
ret = pthread_create(&suspend_thread, NULL, suspend_thread_func, NULL);
if (ret) {
strerror_r(ret, buf, sizeof(buf));
ALOGE("Error creating thread: %s\n", buf);
goto err_pthread_create;
}
ALOGI("Selected wakeup count\n");
return &autosuspend_wakeup_count_ops;
err_pthread_create:
sem_destroy(&suspend_lockout);
err_sem_init:
close(wakeup_count_fd);
err_open_wakeup_count:
close(state_fd);
err_open_state:
return NULL;
}

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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.
*/
#ifndef _LIBSUSPEND_AUTOSUSPEND_H_
#define _LIBSUSPEND_AUTOSUSPEND_H_
#include <sys/cdefs.h>
__BEGIN_DECLS
/*
* autosuspend_enable
*
* Turn on autosuspend in the kernel, allowing it to enter suspend if no
* wakelocks/wakeup_sources are held.
*
*
*
* Returns 0 on success, -1 if autosuspend was not enabled.
*/
int autosuspend_enable(void);
/*
* autosuspend_disable
*
* Turn off autosuspend in the kernel, preventing suspend and synchronizing
* with any in-progress resume.
*
* Returns 0 on success, -1 if autosuspend was not disabled.
*/
int autosuspend_disable(void);
__END_DECLS
#endif