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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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <utils/Log.h>
#include "DisplayHardware/DisplayHardwareBase.h"
#include "SurfaceFlinger.h"
// ----------------------------------------------------------------------------
namespace android {
static char const * const kSleepFileName = "/sys/power/wait_for_fb_sleep";
static char const * const kWakeFileName = "/sys/power/wait_for_fb_wake";
// ----------------------------------------------------------------------------
DisplayHardwareBase::DisplayEventThread::DisplayEventThread(
const sp<SurfaceFlinger>& flinger)
: Thread(false), mFlinger(flinger) {
}
DisplayHardwareBase::DisplayEventThread::~DisplayEventThread() {
}
status_t DisplayHardwareBase::DisplayEventThread::initCheck() const {
return ((access(kSleepFileName, R_OK) == 0 &&
access(kWakeFileName, R_OK) == 0)) ? NO_ERROR : NO_INIT;
}
bool DisplayHardwareBase::DisplayEventThread::threadLoop() {
if (waitForFbSleep() == NO_ERROR) {
sp<SurfaceFlinger> flinger = mFlinger.promote();
ALOGD("About to give-up screen, flinger = %p", flinger.get());
if (flinger != 0) {
flinger->screenReleased();
}
if (waitForFbWake() == NO_ERROR) {
ALOGD("Screen about to return, flinger = %p", flinger.get());
if (flinger != 0) {
flinger->screenAcquired();
}
return true;
}
}
// error, exit the thread
return false;
}
status_t DisplayHardwareBase::DisplayEventThread::waitForFbSleep() {
int err = 0;
char buf;
int fd = open(kSleepFileName, O_RDONLY, 0);
// if the file doesn't exist, the error will be caught in read() below
do {
err = read(fd, &buf, 1);
} while (err < 0 && errno == EINTR);
close(fd);
ALOGE_IF(err<0, "*** ANDROID_WAIT_FOR_FB_SLEEP failed (%s)", strerror(errno));
return err < 0 ? -errno : int(NO_ERROR);
}
status_t DisplayHardwareBase::DisplayEventThread::waitForFbWake() {
int err = 0;
char buf;
int fd = open(kWakeFileName, O_RDONLY, 0);
// if the file doesn't exist, the error will be caught in read() below
do {
err = read(fd, &buf, 1);
} while (err < 0 && errno == EINTR);
close(fd);
ALOGE_IF(err<0, "*** ANDROID_WAIT_FOR_FB_WAKE failed (%s)", strerror(errno));
return err < 0 ? -errno : int(NO_ERROR);
}
// ----------------------------------------------------------------------------
DisplayHardwareBase::DisplayHardwareBase(const sp<SurfaceFlinger>& flinger,
uint32_t displayIndex)
{
mScreenAcquired = true;
mDisplayEventThread = new DisplayEventThread(flinger);
}
void DisplayHardwareBase::startSleepManagement() const {
if (mDisplayEventThread->initCheck() == NO_ERROR) {
mDisplayEventThread->run("DisplayEventThread", PRIORITY_URGENT_DISPLAY);
} else {
ALOGW("/sys/power/wait_for_fb_{wake|sleep} don't exist");
}
}
DisplayHardwareBase::~DisplayHardwareBase() {
// request exit
mDisplayEventThread->requestExitAndWait();
}
bool DisplayHardwareBase::canDraw() const {
return mScreenAcquired;
}
void DisplayHardwareBase::releaseScreen() const {
mScreenAcquired = false;
}
void DisplayHardwareBase::acquireScreen() const {
mScreenAcquired = true;
}
bool DisplayHardwareBase::isScreenAcquired() const {
return mScreenAcquired;
}
}; // namespace android
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