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 <dirent.h>
18 #include <fcntl.h>
19 #include <linux/input.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/epoll.h>
24 #include <sys/ioctl.h>
25 #include <unistd.h>
26
27 #include <functional>
28
29 #include "minui/minui.h"
30
31 #define MAX_DEVICES 16
32 #define MAX_MISC_FDS 16
33
34 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
35 #define BITS_TO_LONGS(x) (((x) + BITS_PER_LONG - 1) / BITS_PER_LONG)
36
37 struct fd_info {
38 int fd;
39 ev_callback cb;
40 };
41
42 static int g_epoll_fd;
43 static epoll_event polledevents[MAX_DEVICES + MAX_MISC_FDS];
44 static int npolledevents;
45
46 static fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
47
48 static unsigned ev_count = 0;
49 static unsigned ev_dev_count = 0;
50 static unsigned ev_misc_count = 0;
51
test_bit(size_t bit,unsigned long * array)52 static bool test_bit(size_t bit, unsigned long* array) { // NOLINT
53 return (array[bit/BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0;
54 }
55
ev_init(ev_callback input_cb,bool allow_touch_inputs)56 int ev_init(ev_callback input_cb, bool allow_touch_inputs) {
57 g_epoll_fd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
58 if (g_epoll_fd == -1) {
59 return -1;
60 }
61
62 bool epollctlfail = false;
63 DIR* dir = opendir("/dev/input");
64 if (dir != nullptr) {
65 dirent* de;
66 while ((de = readdir(dir))) {
67 if (strncmp(de->d_name, "event", 5)) continue;
68 int fd = openat(dirfd(dir), de->d_name, O_RDONLY);
69 if (fd == -1) continue;
70
71 // Use unsigned long to match ioctl's parameter type.
72 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
73
74 // Read the evbits of the input device.
75 if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
76 close(fd);
77 continue;
78 }
79
80 // We assume that only EV_KEY, EV_REL, and EV_SW event types are ever needed. EV_ABS is also
81 // allowed if allow_touch_inputs is set.
82 if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) {
83 if (!allow_touch_inputs || !test_bit(EV_ABS, ev_bits)) {
84 close(fd);
85 continue;
86 }
87 }
88
89 epoll_event ev;
90 ev.events = EPOLLIN | EPOLLWAKEUP;
91 ev.data.ptr = &ev_fdinfo[ev_count];
92 if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
93 close(fd);
94 epollctlfail = true;
95 continue;
96 }
97
98 ev_fdinfo[ev_count].fd = fd;
99 ev_fdinfo[ev_count].cb = std::move(input_cb);
100 ev_count++;
101 ev_dev_count++;
102 if (ev_dev_count == MAX_DEVICES) break;
103 }
104
105 closedir(dir);
106 }
107
108 if (epollctlfail && !ev_count) {
109 close(g_epoll_fd);
110 g_epoll_fd = -1;
111 return -1;
112 }
113
114 return 0;
115 }
116
ev_get_epollfd(void)117 int ev_get_epollfd(void) {
118 return g_epoll_fd;
119 }
120
ev_add_fd(int fd,ev_callback cb)121 int ev_add_fd(int fd, ev_callback cb) {
122 if (ev_misc_count == MAX_MISC_FDS || cb == NULL) {
123 return -1;
124 }
125
126 epoll_event ev;
127 ev.events = EPOLLIN | EPOLLWAKEUP;
128 ev.data.ptr = static_cast<void*>(&ev_fdinfo[ev_count]);
129 int ret = epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev);
130 if (!ret) {
131 ev_fdinfo[ev_count].fd = fd;
132 ev_fdinfo[ev_count].cb = std::move(cb);
133 ev_count++;
134 ev_misc_count++;
135 }
136
137 return ret;
138 }
139
ev_exit(void)140 void ev_exit(void) {
141 while (ev_count > 0) {
142 close(ev_fdinfo[--ev_count].fd);
143 }
144 ev_misc_count = 0;
145 ev_dev_count = 0;
146 close(g_epoll_fd);
147 }
148
ev_wait(int timeout)149 int ev_wait(int timeout) {
150 npolledevents = epoll_wait(g_epoll_fd, polledevents, ev_count, timeout);
151 if (npolledevents <= 0) {
152 return -1;
153 }
154 return 0;
155 }
156
ev_dispatch(void)157 void ev_dispatch(void) {
158 for (int n = 0; n < npolledevents; n++) {
159 fd_info* fdi = static_cast<fd_info*>(polledevents[n].data.ptr);
160 const ev_callback& cb = fdi->cb;
161 if (cb) {
162 cb(fdi->fd, polledevents[n].events);
163 }
164 }
165 }
166
ev_get_input(int fd,uint32_t epevents,input_event * ev)167 int ev_get_input(int fd, uint32_t epevents, input_event* ev) {
168 if (epevents & EPOLLIN) {
169 ssize_t r = TEMP_FAILURE_RETRY(read(fd, ev, sizeof(*ev)));
170 if (r == sizeof(*ev)) {
171 return 0;
172 }
173 }
174 return -1;
175 }
176
ev_sync_key_state(const ev_set_key_callback & set_key_cb)177 int ev_sync_key_state(const ev_set_key_callback& set_key_cb) {
178 // Use unsigned long to match ioctl's parameter type.
179 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
180 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT
181
182 for (size_t i = 0; i < ev_dev_count; ++i) {
183 memset(ev_bits, 0, sizeof(ev_bits));
184 memset(key_bits, 0, sizeof(key_bits));
185
186 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
187 continue;
188 }
189 if (!test_bit(EV_KEY, ev_bits)) {
190 continue;
191 }
192 if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) {
193 continue;
194 }
195
196 for (int code = 0; code <= KEY_MAX; code++) {
197 if (test_bit(code, key_bits)) {
198 set_key_cb(code, 1);
199 }
200 }
201 }
202
203 return 0;
204 }
205
ev_iterate_available_keys(const std::function<void (int)> & f)206 void ev_iterate_available_keys(const std::function<void(int)>& f) {
207 // Use unsigned long to match ioctl's parameter type.
208 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
209 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT
210
211 for (size_t i = 0; i < ev_dev_count; ++i) {
212 memset(ev_bits, 0, sizeof(ev_bits));
213 memset(key_bits, 0, sizeof(key_bits));
214
215 // Does this device even have keys?
216 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
217 continue;
218 }
219 if (!test_bit(EV_KEY, ev_bits)) {
220 continue;
221 }
222
223 int rc = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits);
224 if (rc == -1) {
225 continue;
226 }
227
228 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
229 if (test_bit(key_code, key_bits)) {
230 f(key_code);
231 }
232 }
233 }
234 }
235
ev_iterate_touch_inputs(const std::function<void (int)> & action)236 void ev_iterate_touch_inputs(const std::function<void(int)>& action) {
237 for (size_t i = 0; i < ev_dev_count; ++i) {
238 // Use unsigned long to match ioctl's parameter type.
239 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)] = {}; // NOLINT
240 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
241 continue;
242 }
243 if (!test_bit(EV_ABS, ev_bits)) {
244 continue;
245 }
246
247 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)] = {}; // NOLINT
248 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_ABS, KEY_MAX), key_bits) == -1) {
249 continue;
250 }
251
252 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
253 if (test_bit(key_code, key_bits)) {
254 action(key_code);
255 }
256 }
257 }
258 }
259