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)56 int ev_init(ev_callback input_cb) {
57 bool epollctlfail = false;
58
59 g_epoll_fd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
60 if (g_epoll_fd == -1) {
61 return -1;
62 }
63
64 DIR* dir = opendir("/dev/input");
65 if (dir != NULL) {
66 dirent* de;
67 while ((de = readdir(dir))) {
68 // Use unsigned long to match ioctl's parameter type.
69 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
70
71 // fprintf(stderr,"/dev/input/%s\n", de->d_name);
72 if (strncmp(de->d_name, "event", 5)) continue;
73 int fd = openat(dirfd(dir), de->d_name, O_RDONLY);
74 if (fd == -1) continue;
75
76 // Read the evbits of the input device.
77 if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
78 close(fd);
79 continue;
80 }
81
82 // We assume that only EV_KEY, EV_REL, and EV_SW event types are ever needed.
83 if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) {
84 close(fd);
85 continue;
86 }
87
88 epoll_event ev;
89 ev.events = EPOLLIN | EPOLLWAKEUP;
90 ev.data.ptr = &ev_fdinfo[ev_count];
91 if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
92 close(fd);
93 epollctlfail = true;
94 continue;
95 }
96
97 ev_fdinfo[ev_count].fd = fd;
98 ev_fdinfo[ev_count].cb = std::move(input_cb);
99 ev_count++;
100 ev_dev_count++;
101 if (ev_dev_count == MAX_DEVICES) break;
102 }
103
104 closedir(dir);
105 }
106
107 if (epollctlfail && !ev_count) {
108 close(g_epoll_fd);
109 g_epoll_fd = -1;
110 return -1;
111 }
112
113 return 0;
114 }
115
ev_get_epollfd(void)116 int ev_get_epollfd(void) {
117 return g_epoll_fd;
118 }
119
ev_add_fd(int fd,ev_callback cb)120 int ev_add_fd(int fd, ev_callback cb) {
121 if (ev_misc_count == MAX_MISC_FDS || cb == NULL) {
122 return -1;
123 }
124
125 epoll_event ev;
126 ev.events = EPOLLIN | EPOLLWAKEUP;
127 ev.data.ptr = static_cast<void*>(&ev_fdinfo[ev_count]);
128 int ret = epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev);
129 if (!ret) {
130 ev_fdinfo[ev_count].fd = fd;
131 ev_fdinfo[ev_count].cb = std::move(cb);
132 ev_count++;
133 ev_misc_count++;
134 }
135
136 return ret;
137 }
138
ev_exit(void)139 void ev_exit(void) {
140 while (ev_count > 0) {
141 close(ev_fdinfo[--ev_count].fd);
142 }
143 ev_misc_count = 0;
144 ev_dev_count = 0;
145 close(g_epoll_fd);
146 }
147
ev_wait(int timeout)148 int ev_wait(int timeout) {
149 npolledevents = epoll_wait(g_epoll_fd, polledevents, ev_count, timeout);
150 if (npolledevents <= 0) {
151 return -1;
152 }
153 return 0;
154 }
155
ev_dispatch(void)156 void ev_dispatch(void) {
157 for (int n = 0; n < npolledevents; n++) {
158 fd_info* fdi = static_cast<fd_info*>(polledevents[n].data.ptr);
159 const ev_callback& cb = fdi->cb;
160 if (cb) {
161 cb(fdi->fd, polledevents[n].events);
162 }
163 }
164 }
165
ev_get_input(int fd,uint32_t epevents,input_event * ev)166 int ev_get_input(int fd, uint32_t epevents, input_event* ev) {
167 if (epevents & EPOLLIN) {
168 ssize_t r = TEMP_FAILURE_RETRY(read(fd, ev, sizeof(*ev)));
169 if (r == sizeof(*ev)) {
170 return 0;
171 }
172 }
173 return -1;
174 }
175
ev_sync_key_state(const ev_set_key_callback & set_key_cb)176 int ev_sync_key_state(const ev_set_key_callback& set_key_cb) {
177 // Use unsigned long to match ioctl's parameter type.
178 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
179 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT
180
181 for (size_t i = 0; i < ev_dev_count; ++i) {
182 memset(ev_bits, 0, sizeof(ev_bits));
183 memset(key_bits, 0, sizeof(key_bits));
184
185 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
186 continue;
187 }
188 if (!test_bit(EV_KEY, ev_bits)) {
189 continue;
190 }
191 if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) {
192 continue;
193 }
194
195 for (int code = 0; code <= KEY_MAX; code++) {
196 if (test_bit(code, key_bits)) {
197 set_key_cb(code, 1);
198 }
199 }
200 }
201
202 return 0;
203 }
204
ev_iterate_available_keys(const std::function<void (int)> & f)205 void ev_iterate_available_keys(const std::function<void(int)>& f) {
206 // Use unsigned long to match ioctl's parameter type.
207 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT
208 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT
209
210 for (size_t i = 0; i < ev_dev_count; ++i) {
211 memset(ev_bits, 0, sizeof(ev_bits));
212 memset(key_bits, 0, sizeof(key_bits));
213
214 // Does this device even have keys?
215 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
216 continue;
217 }
218 if (!test_bit(EV_KEY, ev_bits)) {
219 continue;
220 }
221
222 int rc = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits);
223 if (rc == -1) {
224 continue;
225 }
226
227 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
228 if (test_bit(key_code, key_bits)) {
229 f(key_code);
230 }
231 }
232 }
233 }
234