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 <stdio.h>
18 #include <stdlib.h>
19 #include <fcntl.h>
20 #include <dirent.h>
21 #include <sys/epoll.h>
22 #include <unistd.h>
23 #include <string.h>
24
25 #include <linux/input.h>
26
27 #include "minui.h"
28
29 #define MAX_DEVICES 16
30 #define MAX_MISC_FDS 16
31
32 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
33 #define BITS_TO_LONGS(x) (((x) + BITS_PER_LONG - 1) / BITS_PER_LONG)
34
35 #define test_bit(bit, array) \
36 ((array)[(bit)/BITS_PER_LONG] & (1 << ((bit) % BITS_PER_LONG)))
37
38 struct fd_info {
39 int fd;
40 ev_callback cb;
41 void *data;
42 };
43
44 static int epollfd;
45 static struct epoll_event polledevents[MAX_DEVICES + MAX_MISC_FDS];
46 static int npolledevents;
47
48 static struct fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
49
50 static unsigned ev_count = 0;
51 static unsigned ev_dev_count = 0;
52 static unsigned ev_misc_count = 0;
53
ev_init(ev_callback input_cb,void * data)54 int ev_init(ev_callback input_cb, void *data)
55 {
56 DIR *dir;
57 struct dirent *de;
58 int fd;
59 struct epoll_event ev;
60 bool epollctlfail = false;
61
62 epollfd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
63 if (epollfd == -1)
64 return -1;
65
66 dir = opendir("/dev/input");
67 if (dir != 0) {
68 while ((de = readdir(dir))) {
69 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
70
71 // fprintf(stderr,"/dev/input/%s\n", de->d_name);
72 if (strncmp(de->d_name, "event", 5)) continue;
73 fd = openat(dirfd(dir), de->d_name, O_RDONLY);
74 if (fd < 0) continue;
75
76 /* read the evbits of the input device */
77 if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) < 0) {
78 close(fd);
79 continue;
80 }
81
82 /* TODO: add ability to specify event masks. For now, just assume
83 * that only EV_KEY and EV_REL event types are ever needed. */
84 if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits)) {
85 close(fd);
86 continue;
87 }
88
89 ev.events = EPOLLIN | EPOLLWAKEUP;
90 ev.data.ptr = (void *)&ev_fdinfo[ev_count];
91 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev)) {
92 close(fd);
93 epollctlfail = true;
94 continue;
95 }
96
97 ev_fdinfo[ev_count].fd = fd;
98 ev_fdinfo[ev_count].cb = input_cb;
99 ev_fdinfo[ev_count].data = data;
100 ev_count++;
101 ev_dev_count++;
102 if (ev_dev_count == MAX_DEVICES) break;
103 }
104 }
105
106 if (epollctlfail && !ev_count) {
107 close(epollfd);
108 epollfd = -1;
109 return -1;
110 }
111
112 return 0;
113 }
114
ev_add_fd(int fd,ev_callback cb,void * data)115 int ev_add_fd(int fd, ev_callback cb, void *data)
116 {
117 struct epoll_event ev;
118 int ret;
119
120 if (ev_misc_count == MAX_MISC_FDS || cb == NULL)
121 return -1;
122
123 ev.events = EPOLLIN | EPOLLWAKEUP;
124 ev.data.ptr = (void *)&ev_fdinfo[ev_count];
125 ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev);
126 if (!ret) {
127 ev_fdinfo[ev_count].fd = fd;
128 ev_fdinfo[ev_count].cb = cb;
129 ev_fdinfo[ev_count].data = data;
130 ev_count++;
131 ev_misc_count++;
132 }
133
134 return ret;
135 }
136
ev_get_epollfd(void)137 int ev_get_epollfd(void)
138 {
139 return epollfd;
140 }
141
ev_exit(void)142 void ev_exit(void)
143 {
144 while (ev_count > 0) {
145 close(ev_fdinfo[--ev_count].fd);
146 }
147 ev_misc_count = 0;
148 ev_dev_count = 0;
149 close(epollfd);
150 }
151
ev_wait(int timeout)152 int ev_wait(int timeout)
153 {
154 npolledevents = epoll_wait(epollfd, polledevents, ev_count, timeout);
155 if (npolledevents <= 0)
156 return -1;
157 return 0;
158 }
159
ev_dispatch(void)160 void ev_dispatch(void)
161 {
162 int n;
163 int ret;
164
165 for (n = 0; n < npolledevents; n++) {
166 struct fd_info *fdi = polledevents[n].data.ptr;
167 ev_callback cb = fdi->cb;
168 if (cb)
169 cb(fdi->fd, polledevents[n].events, fdi->data);
170 }
171 }
172
ev_get_input(int fd,uint32_t epevents,struct input_event * ev)173 int ev_get_input(int fd, uint32_t epevents, struct input_event *ev)
174 {
175 int r;
176
177 if (epevents & EPOLLIN) {
178 r = read(fd, ev, sizeof(*ev));
179 if (r == sizeof(*ev))
180 return 0;
181 }
182 return -1;
183 }
184
ev_sync_key_state(ev_set_key_callback set_key_cb,void * data)185 int ev_sync_key_state(ev_set_key_callback set_key_cb, void *data)
186 {
187 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];
188 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
189 unsigned i;
190 int ret;
191
192 for (i = 0; i < ev_dev_count; i++) {
193 int code;
194
195 memset(key_bits, 0, sizeof(key_bits));
196 memset(ev_bits, 0, sizeof(ev_bits));
197
198 ret = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
199 if (ret < 0 || !test_bit(EV_KEY, ev_bits))
200 continue;
201
202 ret = ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits);
203 if (ret < 0)
204 continue;
205
206 for (code = 0; code <= KEY_MAX; code++) {
207 if (test_bit(code, key_bits))
208 set_key_cb(code, 1, data);
209 }
210 }
211
212 return 0;
213 }
214