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