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/poll.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 ev_callback cb;
38 void *data;
39 };
40
41 static struct pollfd ev_fds[MAX_DEVICES + MAX_MISC_FDS];
42 static struct fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
43
44 static unsigned ev_count = 0;
45 static unsigned ev_dev_count = 0;
46 static unsigned ev_misc_count = 0;
47
ev_init(ev_callback input_cb,void * data)48 int ev_init(ev_callback input_cb, void *data)
49 {
50 DIR *dir;
51 struct dirent *de;
52 int fd;
53
54 dir = opendir("/dev/input");
55 if(dir != 0) {
56 while((de = readdir(dir))) {
57 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
58
59 // fprintf(stderr,"/dev/input/%s\n", de->d_name);
60 if(strncmp(de->d_name,"event",5)) continue;
61 fd = openat(dirfd(dir), de->d_name, O_RDONLY);
62 if(fd < 0) continue;
63
64 /* read the evbits of the input device */
65 if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) < 0) {
66 close(fd);
67 continue;
68 }
69
70 /* TODO: add ability to specify event masks. For now, just assume
71 * that only EV_KEY and EV_REL event types are ever needed. */
72 if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits)) {
73 close(fd);
74 continue;
75 }
76
77 ev_fds[ev_count].fd = fd;
78 ev_fds[ev_count].events = POLLIN;
79 ev_fdinfo[ev_count].cb = input_cb;
80 ev_fdinfo[ev_count].data = data;
81 ev_count++;
82 ev_dev_count++;
83 if(ev_dev_count == MAX_DEVICES) break;
84 }
85 }
86
87 return 0;
88 }
89
ev_add_fd(int fd,ev_callback cb,void * data)90 int ev_add_fd(int fd, ev_callback cb, void *data)
91 {
92 if (ev_misc_count == MAX_MISC_FDS || cb == NULL)
93 return -1;
94
95 ev_fds[ev_count].fd = fd;
96 ev_fds[ev_count].events = POLLIN;
97 ev_fdinfo[ev_count].cb = cb;
98 ev_fdinfo[ev_count].data = data;
99 ev_count++;
100 ev_misc_count++;
101 return 0;
102 }
103
ev_exit(void)104 void ev_exit(void)
105 {
106 while (ev_count > 0) {
107 close(ev_fds[--ev_count].fd);
108 }
109 ev_misc_count = 0;
110 ev_dev_count = 0;
111 }
112
ev_wait(int timeout)113 int ev_wait(int timeout)
114 {
115 int r;
116
117 r = poll(ev_fds, ev_count, timeout);
118 if (r <= 0)
119 return -1;
120 return 0;
121 }
122
ev_dispatch(void)123 void ev_dispatch(void)
124 {
125 unsigned n;
126 int ret;
127
128 for (n = 0; n < ev_count; n++) {
129 ev_callback cb = ev_fdinfo[n].cb;
130 if (cb && (ev_fds[n].revents & ev_fds[n].events))
131 cb(ev_fds[n].fd, ev_fds[n].revents, ev_fdinfo[n].data);
132 }
133 }
134
ev_get_input(int fd,short revents,struct input_event * ev)135 int ev_get_input(int fd, short revents, struct input_event *ev)
136 {
137 int r;
138
139 if (revents & POLLIN) {
140 r = read(fd, ev, sizeof(*ev));
141 if (r == sizeof(*ev))
142 return 0;
143 }
144 return -1;
145 }
146
ev_sync_key_state(ev_set_key_callback set_key_cb,void * data)147 int ev_sync_key_state(ev_set_key_callback set_key_cb, void *data)
148 {
149 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];
150 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
151 unsigned i;
152 int ret;
153
154 for (i = 0; i < ev_dev_count; i++) {
155 int code;
156
157 memset(key_bits, 0, sizeof(key_bits));
158 memset(ev_bits, 0, sizeof(ev_bits));
159
160 ret = ioctl(ev_fds[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
161 if (ret < 0 || !test_bit(EV_KEY, ev_bits))
162 continue;
163
164 ret = ioctl(ev_fds[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits);
165 if (ret < 0)
166 continue;
167
168 for (code = 0; code <= KEY_MAX; code++) {
169 if (test_bit(code, key_bits))
170 set_key_cb(code, 1, data);
171 }
172 }
173
174 return 0;
175 }
176