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1 /*
2  * Copyright (C) 2007 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <assert.h>
18 #include <errno.h>
19 #include <stdlib.h>
20 #include <stdio.h>
21 #include <string.h>
22 
23 #include <unistd.h>
24 #include <fcntl.h>
25 #include <signal.h>
26 #include <termios.h>
27 #include <sys/ioctl.h>
28 #include <sys/mman.h>
29 #include <sys/time.h>
30 #include <sys/types.h>
31 #include <sys/resource.h>
32 
33 #include <linux/unistd.h>
34 
35 #include <utils/Log.h>
36 
37 #include "DisplayHardware/DisplayHardwareBase.h"
38 #include "SurfaceFlinger.h"
39 
40 // ----------------------------------------------------------------------------
41 namespace android {
42 
43 static char const * const kSleepFileName = "/sys/power/wait_for_fb_sleep";
44 static char const * const kWakeFileName  = "/sys/power/wait_for_fb_wake";
45 
46 // ----------------------------------------------------------------------------
47 
DisplayEventThreadBase(const sp<SurfaceFlinger> & flinger)48 DisplayHardwareBase::DisplayEventThreadBase::DisplayEventThreadBase(
49         const sp<SurfaceFlinger>& flinger)
50     : Thread(false), mFlinger(flinger) {
51 }
52 
~DisplayEventThreadBase()53 DisplayHardwareBase::DisplayEventThreadBase::~DisplayEventThreadBase() {
54 }
55 
56 // ----------------------------------------------------------------------------
57 
DisplayEventThread(const sp<SurfaceFlinger> & flinger)58 DisplayHardwareBase::DisplayEventThread::DisplayEventThread(
59         const sp<SurfaceFlinger>& flinger)
60     : DisplayEventThreadBase(flinger)
61 {
62 }
63 
~DisplayEventThread()64 DisplayHardwareBase::DisplayEventThread::~DisplayEventThread()
65 {
66 }
67 
threadLoop()68 bool DisplayHardwareBase::DisplayEventThread::threadLoop()
69 {
70     int err = 0;
71     char buf;
72     int fd;
73 
74     fd = open(kSleepFileName, O_RDONLY, 0);
75     do {
76       err = read(fd, &buf, 1);
77     } while (err < 0 && errno == EINTR);
78     close(fd);
79     LOGW_IF(err<0, "ANDROID_WAIT_FOR_FB_SLEEP failed (%s)", strerror(errno));
80     if (err >= 0) {
81         sp<SurfaceFlinger> flinger = mFlinger.promote();
82         LOGD("About to give-up screen, flinger = %p", flinger.get());
83         if (flinger != 0) {
84             mBarrier.close();
85             flinger->screenReleased(0);
86             mBarrier.wait();
87         }
88     }
89     fd = open(kWakeFileName, O_RDONLY, 0);
90     do {
91       err = read(fd, &buf, 1);
92     } while (err < 0 && errno == EINTR);
93     close(fd);
94     LOGW_IF(err<0, "ANDROID_WAIT_FOR_FB_WAKE failed (%s)", strerror(errno));
95     if (err >= 0) {
96         sp<SurfaceFlinger> flinger = mFlinger.promote();
97         LOGD("Screen about to return, flinger = %p", flinger.get());
98         if (flinger != 0)
99             flinger->screenAcquired(0);
100     }
101     return true;
102 }
103 
releaseScreen() const104 status_t DisplayHardwareBase::DisplayEventThread::releaseScreen() const
105 {
106     mBarrier.open();
107     return NO_ERROR;
108 }
109 
readyToRun()110 status_t DisplayHardwareBase::DisplayEventThread::readyToRun()
111 {
112     return NO_ERROR;
113 }
114 
initCheck() const115 status_t DisplayHardwareBase::DisplayEventThread::initCheck() const
116 {
117     return ((access(kSleepFileName, R_OK) == 0 &&
118             access(kWakeFileName, R_OK) == 0)) ? NO_ERROR : NO_INIT;
119 }
120 
121 // ----------------------------------------------------------------------------
122 
DisplayHardwareBase(const sp<SurfaceFlinger> & flinger,uint32_t displayIndex)123 DisplayHardwareBase::DisplayHardwareBase(const sp<SurfaceFlinger>& flinger,
124         uint32_t displayIndex)
125     : mScreenAcquired(true)
126 {
127     mDisplayEventThread = new DisplayEventThread(flinger);
128 }
129 
~DisplayHardwareBase()130 DisplayHardwareBase::~DisplayHardwareBase()
131 {
132     // request exit
133     mDisplayEventThread->requestExitAndWait();
134 }
135 
canDraw() const136 bool DisplayHardwareBase::canDraw() const
137 {
138     return mScreenAcquired;
139 }
140 
releaseScreen() const141 void DisplayHardwareBase::releaseScreen() const
142 {
143     status_t err = mDisplayEventThread->releaseScreen();
144     if (err >= 0) {
145         mScreenAcquired = false;
146     }
147 }
148 
acquireScreen() const149 void DisplayHardwareBase::acquireScreen() const
150 {
151     status_t err = mDisplayEventThread->acquireScreen();
152     if (err >= 0) {
153         mScreenAcquired = true;
154     }
155 }
156 
isScreenAcquired() const157 bool DisplayHardwareBase::isScreenAcquired() const
158 {
159     return mScreenAcquired;
160 }
161 
162 }; // namespace android
163