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