1 /*
2 * Copyright (C) 2016 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
19 #define LOG_TAG "hwc-drm-event-listener"
20
21 #include "drmeventlistener.h"
22 #include "drmresources.h"
23
24 #include <linux/netlink.h>
25 #include <sys/socket.h>
26
27 #include <assert.h>
28 #include <cutils/log.h>
29 #include <xf86drm.h>
30
31 namespace android {
32
DrmEventListener(DrmResources * drm)33 DrmEventListener::DrmEventListener(DrmResources *drm)
34 : Worker("drm-event-listener", HAL_PRIORITY_URGENT_DISPLAY),
35 drm_(drm) {
36 }
37
Init()38 int DrmEventListener::Init() {
39 uevent_fd_.Set(socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT));
40 if (uevent_fd_.get() < 0) {
41 ALOGE("Failed to open uevent socket %d", uevent_fd_.get());
42 return uevent_fd_.get();
43 }
44
45 struct sockaddr_nl addr;
46 memset(&addr, 0, sizeof(addr));
47 addr.nl_family = AF_NETLINK;
48 addr.nl_pid = getpid();
49 addr.nl_groups = 0xFFFFFFFF;
50
51 int ret = bind(uevent_fd_.get(), (struct sockaddr *)&addr, sizeof(addr));
52 if (ret) {
53 ALOGE("Failed to bind uevent socket %d", -errno);
54 return -errno;
55 }
56
57 FD_ZERO(&fds_);
58 FD_SET(drm_->fd(), &fds_);
59 FD_SET(uevent_fd_.get(), &fds_);
60 max_fd_ = std::max(drm_->fd(), uevent_fd_.get());
61
62 return InitWorker();
63 }
64
RegisterHotplugHandler(DrmEventHandler * handler)65 void DrmEventListener::RegisterHotplugHandler(DrmEventHandler *handler) {
66 assert(!hotplug_handler_);
67 hotplug_handler_ = handler;
68 }
69
FlipHandler(int,unsigned int,unsigned int tv_sec,unsigned int tv_usec,void * user_data)70 void DrmEventListener::FlipHandler(int /* fd */, unsigned int /* sequence */,
71 unsigned int tv_sec, unsigned int tv_usec,
72 void *user_data) {
73 DrmEventHandler *handler = (DrmEventHandler *)user_data;
74 if (!handler)
75 return;
76
77 handler->HandleEvent((uint64_t)tv_sec * 1000 * 1000 + tv_usec);
78 delete handler;
79 }
80
UEventHandler()81 void DrmEventListener::UEventHandler() {
82 char buffer[1024];
83 int ret;
84
85 struct timespec ts;
86 uint64_t timestamp = 0;
87 ret = clock_gettime(CLOCK_MONOTONIC, &ts);
88 if (!ret)
89 timestamp = ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec;
90 else
91 ALOGE("Failed to get monotonic clock on hotplug %d", ret);
92
93 while (true) {
94 ret = read(uevent_fd_.get(), &buffer, sizeof(buffer));
95 if (ret == 0) {
96 return;
97 } else if (ret < 0) {
98 ALOGE("Got error reading uevent %d", ret);
99 return;
100 }
101
102 if (!hotplug_handler_)
103 continue;
104
105 bool drm_event = false, hotplug_event = false;
106 for (int i = 0; i < ret;) {
107 char *event = buffer + i;
108 if (strcmp(event, "DEVTYPE=drm_minor"))
109 drm_event = true;
110 else if (strcmp(event, "HOTPLUG=1"))
111 hotplug_event = true;
112
113 i += strlen(event) + 1;
114 }
115
116 if (drm_event && hotplug_event)
117 hotplug_handler_->HandleEvent(timestamp);
118 }
119 }
120
Routine()121 void DrmEventListener::Routine() {
122 int ret;
123 do {
124 ret = select(max_fd_ + 1, &fds_, NULL, NULL, NULL);
125 } while (ret == -1 && errno == EINTR);
126
127 if (FD_ISSET(drm_->fd(), &fds_)) {
128 drmEventContext event_context = {
129 .version = DRM_EVENT_CONTEXT_VERSION,
130 .vblank_handler = NULL,
131 .page_flip_handler = DrmEventListener::FlipHandler};
132 drmHandleEvent(drm_->fd(), &event_context);
133 }
134
135 if (FD_ISSET(uevent_fd_.get(), &fds_))
136 UEventHandler();
137 }
138 }
139