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