1
2 /*
3 * Copyright (C) 2010 The Android Open Source Project
4 * Copyright (C) 2012, The Linux Foundation. All rights reserved.
5 *
6 * Not a Contribution, Apache license notifications and license are
7 * retained for attribution purposes only.
8
9 * Licensed under the Apache License, Version 2.0 (the "License");
10 * you may not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21 #define UEVENT_DEBUG 0
22 #include <hardware_legacy/uevent.h>
23 #include <utils/Log.h>
24 #include <sys/resource.h>
25 #include <sys/prctl.h>
26 #include <string.h>
27 #include <stdlib.h>
28 #include "hwc_utils.h"
29 #include "hwc_fbupdate.h"
30 #include "hwc_mdpcomp.h"
31 #include "hwc_copybit.h"
32 #include "comptype.h"
33 #include "external.h"
34 #include "mdp_version.h"
35
36 namespace qhwc {
37
38 #define HWC_UEVENT_THREAD_NAME "hwcUeventThread"
39
40 /* External Display states */
41 enum {
42 EXTERNAL_OFFLINE = 0,
43 EXTERNAL_ONLINE,
44 EXTERNAL_PAUSE,
45 EXTERNAL_RESUME
46 };
47
isHDMI(const char * str)48 static bool isHDMI(const char* str)
49 {
50 if(strcasestr("change@/devices/virtual/switch/hdmi", str))
51 return true;
52 return false;
53 }
54
handle_uevent(hwc_context_t * ctx,const char * udata,int len)55 static void handle_uevent(hwc_context_t* ctx, const char* udata, int len)
56 {
57 const char *str = udata;
58
59 if(!strcasestr("change@/devices/virtual/switch/hdmi", str) &&
60 !strcasestr("change@/devices/virtual/switch/wfd", str)) {
61 ALOGD_IF(UEVENT_DEBUG, "%s: Not Ext Disp Event ", __FUNCTION__);
62 return;
63 }
64 int connected = -1; // initial value - will be set to 1/0 based on hotplug
65 int extDpyNum = HWC_DISPLAY_EXTERNAL;
66 char property[PROPERTY_VALUE_MAX];
67 if((property_get("persist.sys.wfd.virtual", property, NULL) > 0) &&
68 (!strncmp(property, "1", PROPERTY_VALUE_MAX ) ||
69 (!strncasecmp(property,"true", PROPERTY_VALUE_MAX )))) {
70 // This means we are using Google API to trigger WFD Display
71 extDpyNum = HWC_DISPLAY_VIRTUAL;
72
73 }
74
75 int dpy = isHDMI(str) ? HWC_DISPLAY_EXTERNAL : extDpyNum;
76
77 // update extDpyNum
78 ctx->mExtDisplay->setExtDpyNum(dpy);
79
80 // parse HDMI/WFD switch state for connect/disconnect
81 // for HDMI:
82 // The event will be of the form:
83 // change@/devices/virtual/switch/hdmi ACTION=change
84 // SWITCH_STATE=1 or SWITCH_STATE=0
85 while(*str) {
86 if (!strncmp(str, "SWITCH_STATE=", strlen("SWITCH_STATE="))) {
87 connected = atoi(str + strlen("SWITCH_STATE="));
88 //Disabled until SF calls unblank
89 ctx->dpyAttr[HWC_DISPLAY_EXTERNAL].isActive = false;
90 //Ignored for Virtual Displays
91 //ToDo: we can do this in a much better way
92 ctx->dpyAttr[HWC_DISPLAY_VIRTUAL].isActive = true;
93 break;
94 }
95 str += strlen(str) + 1;
96 if (str - udata >= len)
97 break;
98 }
99
100 switch(connected) {
101 case EXTERNAL_OFFLINE:
102 { // disconnect event
103 ctx->mExtDisplay->processUEventOffline(udata);
104 Locker::Autolock _l(ctx->mDrawLock);
105 clearSecondaryObjs(ctx, dpy);
106 ALOGD("%s sending hotplug: connected = %d and dpy:%d",
107 __FUNCTION__, connected, dpy);
108 ctx->dpyAttr[dpy].connected = false;
109 //hwc comp could be on
110 ctx->proc->hotplug(ctx->proc, dpy, connected);
111 break;
112 }
113 case EXTERNAL_ONLINE:
114 { // connect case
115 {
116 //Force composition to give up resources like pipes and
117 //close fb. For example if assertive display is going on,
118 //fb2 could be open, thus connecting Layer Mixer#0 to
119 //WriteBack module. If HDMI attempts to open fb1, the driver
120 //will try to attach Layer Mixer#0 to HDMI INT, which will
121 //fail, since Layer Mixer#0 is still connected to WriteBack.
122 //This block will force composition to close fb2 in above
123 //example.
124 Locker::Autolock _l(ctx->mDrawLock);
125 ctx->dpyAttr[dpy].isConfiguring = true;
126 ctx->dpyAttr[dpy].connected = false;
127 ctx->proc->invalidate(ctx->proc);
128 }
129 //2 cycles for slower content
130 usleep(ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period
131 * 2 / 1000);
132 ctx->mExtDisplay->processUEventOnline(udata);
133 {
134 Locker::Autolock _l(ctx->mDrawLock);
135 ctx->dpyAttr[dpy].isPause = false;
136 setupSecondaryObjs(ctx, dpy);
137 ALOGD("%s sending hotplug: connected = %d", __FUNCTION__,
138 connected);
139 ctx->dpyAttr[dpy].connected = true;
140 ctx->proc->hotplug(ctx->proc, dpy, connected);
141 }
142 break;
143 }
144 case EXTERNAL_PAUSE:
145 { // pause case
146 ALOGD("%s Received Pause event",__FUNCTION__);
147 Locker::Autolock _l(ctx->mDrawLock);
148 ctx->dpyAttr[dpy].isActive = true;
149 ctx->dpyAttr[dpy].isPause = true;
150 break;
151 }
152 case EXTERNAL_RESUME:
153 { // resume case
154 ALOGD("%s Received resume event",__FUNCTION__);
155 //Treat Resume as Online event
156 //Since external didnt have any pipes, force primary to give up
157 //its pipes; we don't allow inter-mixer pipe transfers.
158 {
159 Locker::Autolock _l(ctx->mDrawLock);
160 ctx->dpyAttr[dpy].isConfiguring = true;
161 ctx->dpyAttr[dpy].isActive = true;
162 ctx->proc->invalidate(ctx->proc);
163 }
164 usleep(ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period
165 * 2 / 1000);
166 //At this point external has all the pipes it would need.
167 {
168 Locker::Autolock _l(ctx->mDrawLock);
169 ctx->dpyAttr[dpy].isPause = false;
170 ctx->proc->invalidate(ctx->proc);
171 }
172 break;
173 }
174 default:
175 {
176 ALOGE("ignore event and connected:%d",connected);
177 break;
178 }
179 }
180 }
181
uevent_loop(void * param)182 static void *uevent_loop(void *param)
183 {
184 int len = 0;
185 static char udata[PAGE_SIZE];
186 hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param);
187 char thread_name[64] = HWC_UEVENT_THREAD_NAME;
188 prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0);
189 setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
190 uevent_init();
191
192 while(1) {
193 len = uevent_next_event(udata, sizeof(udata) - 2);
194 handle_uevent(ctx, udata, len);
195 }
196
197 return NULL;
198 }
199
init_uevent_thread(hwc_context_t * ctx)200 void init_uevent_thread(hwc_context_t* ctx)
201 {
202 pthread_t uevent_thread;
203 int ret;
204
205 ALOGI("Initializing UEVENT Thread");
206 ret = pthread_create(&uevent_thread, NULL, uevent_loop, (void*) ctx);
207 if (ret) {
208 ALOGE("%s: failed to create %s: %s", __FUNCTION__,
209 HWC_UEVENT_THREAD_NAME, strerror(ret));
210 }
211 }
212
213 }; //namespace
214