1 
2 /*
3  * Copyright (C) 2010 The Android Open Source Project
4  * Copyright (C) 2012-14, 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 "hdmi.h"
34 #include "hwc_virtual.h"
35 #include "mdp_version.h"
36 using namespace overlay;
37 namespace qhwc {
38 #define HWC_UEVENT_SWITCH_STR  "change@/devices/virtual/switch/"
39 #define HWC_UEVENT_THREAD_NAME "hwcUeventThread"
40 
41 /* Parse uevent data for devices which we are interested */
getConnectedDisplay(hwc_context_t * ctx,const char * strUdata)42 static int getConnectedDisplay(hwc_context_t* ctx, const char* strUdata)
43 {
44     int ret = -1;
45     // Switch node for HDMI as PRIMARY/EXTERNAL
46     if(strcasestr("change@/devices/virtual/switch/hdmi", strUdata)) {
47         if (ctx->mHDMIDisplay->isHDMIPrimaryDisplay()) {
48             ret = HWC_DISPLAY_PRIMARY;
49         } else {
50             ret = HWC_DISPLAY_EXTERNAL;
51         }
52     }
53     return ret;
54 }
55 
getPanelResetStatus(hwc_context_t * ctx,const char * strUdata,int len)56 static bool getPanelResetStatus(hwc_context_t* ctx, const char* strUdata, int len)
57 {
58     const char* iter_str = strUdata;
59     if (strcasestr("change@/devices/virtual/graphics/fb0", strUdata)) {
60         while(((iter_str - strUdata) <= len) && (*iter_str)) {
61             char* pstr = strstr(iter_str, "PANEL_ALIVE=0");
62             if (pstr != NULL) {
63                 ALOGI("%s: got change event in fb0 with PANEL_ALIVE=0",
64                                                            __FUNCTION__);
65                 ctx->mPanelResetStatus = true;
66                 return true;
67             }
68             iter_str += strlen(iter_str)+1;
69         }
70     }
71     return false;
72 }
73 
74 /* Parse uevent data for action requested for the display */
getConnectedState(const char * strUdata,int len)75 static int getConnectedState(const char* strUdata, int len)
76 {
77     const char* iter_str = strUdata;
78     while(((iter_str - strUdata) <= len) && (*iter_str)) {
79         char* pstr = strstr(iter_str, "SWITCH_STATE=");
80         if (pstr != NULL) {
81             return (atoi(pstr + strlen("SWITCH_STATE=")));
82         }
83         iter_str += strlen(iter_str)+1;
84     }
85     return -1;
86 }
87 
handle_uevent(hwc_context_t * ctx,const char * udata,int len)88 static void handle_uevent(hwc_context_t* ctx, const char* udata, int len)
89 {
90     bool bpanelReset = getPanelResetStatus(ctx, udata, len);
91     if (bpanelReset) {
92         ctx->proc->invalidate(ctx->proc);
93         return;
94     }
95 
96     int dpy = getConnectedDisplay(ctx, udata);
97     if(dpy < 0) {
98         ALOGD_IF(UEVENT_DEBUG, "%s: Not disp Event ", __FUNCTION__);
99         return;
100     }
101 
102     int switch_state = getConnectedState(udata, len);
103 
104     ALOGE_IF(UEVENT_DEBUG,"%s: uevent received: %s switch state: %d",
105              __FUNCTION__,udata, switch_state);
106 
107     switch(switch_state) {
108     case EXTERNAL_OFFLINE:
109         {
110             /* Display not connected */
111             if(!ctx->dpyAttr[dpy].connected){
112                 ALOGE_IF(UEVENT_DEBUG,"%s: Ignoring EXTERNAL_OFFLINE event"
113                          "for display: %d", __FUNCTION__, dpy);
114                 break;
115             }
116 
117             ctx->mDrawLock.lock();
118             handle_offline(ctx, dpy);
119             ctx->mDrawLock.unlock();
120 
121             /* We need to send hotplug to SF only when we are disconnecting
122              * HDMI as an external display. */
123             if(dpy == HWC_DISPLAY_EXTERNAL) {
124                 ALOGE_IF(UEVENT_DEBUG,"%s:Sending EXTERNAL OFFLINE hotplug"
125                         "event", __FUNCTION__);
126                 ctx->proc->hotplug(ctx->proc, dpy, EXTERNAL_OFFLINE);
127             }
128             break;
129         }
130     case EXTERNAL_ONLINE:
131         {
132             /* Display already connected */
133             if(ctx->dpyAttr[dpy].connected) {
134                 ALOGE_IF(UEVENT_DEBUG,"%s: Ignoring EXTERNAL_ONLINE event"
135                          "for display: %d", __FUNCTION__, dpy);
136                 break;
137             }
138 
139             if (ctx->mHDMIDisplay->isHDMIPrimaryDisplay()) {
140                 ctx->mDrawLock.lock();
141                 handle_online(ctx, dpy);
142                 ctx->mDrawLock.unlock();
143 
144                 ctx->proc->invalidate(ctx->proc);
145                 break;
146             } else {
147                 ctx->mDrawLock.lock();
148                 //Force composition to give up resources like pipes and
149                 //close fb. For example if assertive display is going on,
150                 //fb2 could be open, thus connecting Layer Mixer#0 to
151                 //WriteBack module. If HDMI attempts to open fb1, the driver
152                 //will try to attach Layer Mixer#0 to HDMI INT, which will
153                 //fail, since Layer Mixer#0 is still connected to WriteBack.
154                 //This block will force composition to close fb2 in above
155                 //example.
156                 ctx->dpyAttr[dpy].isConfiguring = true;
157                 ctx->mDrawLock.unlock();
158 
159                 ctx->proc->invalidate(ctx->proc);
160             }
161             //2 cycles for slower content
162             usleep(ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period
163                    * 2 / 1000);
164 
165             if(isVDConnected(ctx)) {
166                 // Do not initiate WFD teardown if WFD architecture is based
167                 // on VDS mechanism.
168                 // WFD Stack listens to HDMI intent and initiates virtual
169                 // display teardown.
170                 // ToDo: Currently non-WFD Virtual display clients do not
171                 // involve HWC. If there is a change, we need to come up
172                 // with mechanism of how to address non-WFD Virtual display
173                 // clients + HDMI
174                 ctx->mWfdSyncLock.lock();
175                 ALOGD_IF(HWC_WFDDISPSYNC_LOG,
176                         "%s: Waiting for wfd-teardown to be signalled",
177                         __FUNCTION__);
178                 ctx->mWfdSyncLock.wait();
179                 ALOGD_IF(HWC_WFDDISPSYNC_LOG,
180                         "%s: Teardown signalled. Completed waiting in"
181                         "uevent thread", __FUNCTION__);
182                 ctx->mWfdSyncLock.unlock();
183             }
184             ctx->mHDMIDisplay->configure();
185             ctx->mHDMIDisplay->activateDisplay();
186 
187             ctx->mDrawLock.lock();
188             updateDisplayInfo(ctx, dpy);
189             initCompositionResources(ctx, dpy);
190             ctx->dpyAttr[dpy].isPause = false;
191             ctx->dpyAttr[dpy].connected = true;
192             ctx->dpyAttr[dpy].isConfiguring = true;
193             ctx->mDrawLock.unlock();
194 
195             /* External display is HDMI */
196             ALOGE_IF(UEVENT_DEBUG, "%s: Sending EXTERNAL ONLINE"
197                     "hotplug event", __FUNCTION__);
198             ctx->proc->hotplug(ctx->proc, dpy, EXTERNAL_ONLINE);
199             break;
200         }
201     default:
202         {
203             ALOGE("%s: Invalid state to swtich:%d", __FUNCTION__, switch_state);
204             break;
205         }
206     }
207 }
208 
uevent_loop(void * param)209 static void *uevent_loop(void *param)
210 {
211     int len = 0;
212     static char udata[PAGE_SIZE];
213     hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param);
214     char thread_name[64] = HWC_UEVENT_THREAD_NAME;
215     prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0);
216     setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
217     if(!uevent_init()) {
218         ALOGE("%s: failed to init uevent ",__FUNCTION__);
219         return NULL;
220     }
221 
222     while(1) {
223         len = uevent_next_event(udata, (int)sizeof(udata) - 2);
224         handle_uevent(ctx, udata, len);
225     }
226 
227     return NULL;
228 }
229 
init_uevent_thread(hwc_context_t * ctx)230 void init_uevent_thread(hwc_context_t* ctx)
231 {
232     pthread_t uevent_thread;
233     int ret;
234 
235     ALOGI("Initializing UEVENT Thread");
236     ret = pthread_create(&uevent_thread, NULL, uevent_loop, (void*) ctx);
237     if (ret) {
238         ALOGE("%s: failed to create %s: %s", __FUNCTION__,
239             HWC_UEVENT_THREAD_NAME, strerror(ret));
240     }
241 }
242 
243 }; //namespace
244