blob: 2d47a587fdd43e6414266f8ce8c1924dccb1989f [file] [log] [blame]
Elliott Hughes07138192015-04-10 09:40:53 -07001/*
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 <stdio.h>
20#include <stdlib.h>
21#include <string.h>
22#include <sys/epoll.h>
23#include <unistd.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
35struct fd_info {
36 int fd;
37 ev_callback cb;
38 void* data;
39};
40
41static int g_epoll_fd;
Elliott Hughes07cfb8f2015-04-10 13:12:05 -070042static epoll_event polledevents[MAX_DEVICES + MAX_MISC_FDS];
Elliott Hughes07138192015-04-10 09:40:53 -070043static int npolledevents;
44
Elliott Hughes07cfb8f2015-04-10 13:12:05 -070045static fd_info ev_fdinfo[MAX_DEVICES + MAX_MISC_FDS];
Elliott Hughes07138192015-04-10 09:40:53 -070046
47static unsigned ev_count = 0;
48static unsigned ev_dev_count = 0;
49static unsigned ev_misc_count = 0;
50
51static bool test_bit(size_t bit, unsigned long* array) {
52 return (array[bit/BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0;
53}
54
55int ev_init(ev_callback input_cb, void* data) {
56 bool epollctlfail = false;
57
58 g_epoll_fd = epoll_create(MAX_DEVICES + MAX_MISC_FDS);
59 if (g_epoll_fd == -1) {
60 return -1;
61 }
62
63 DIR* dir = opendir("/dev/input");
64 if (dir != NULL) {
Elliott Hughes07cfb8f2015-04-10 13:12:05 -070065 dirent* de;
Elliott Hughes07138192015-04-10 09:40:53 -070066 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 int fd = openat(dirfd(dir), de->d_name, O_RDONLY);
72 if (fd == -1) continue;
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.
81 if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) {
82 close(fd);
83 continue;
84 }
85
Elliott Hughes07cfb8f2015-04-10 13:12:05 -070086 epoll_event ev;
Elliott Hughes07138192015-04-10 09:40:53 -070087 ev.events = EPOLLIN | EPOLLWAKEUP;
88 ev.data.ptr = &ev_fdinfo[ev_count];
89 if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
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 closedir(dir);
104 }
105
106 if (epollctlfail && !ev_count) {
107 close(g_epoll_fd);
108 g_epoll_fd = -1;
109 return -1;
110 }
111
112 return 0;
113}
114
115int ev_get_epollfd(void) {
116 return g_epoll_fd;
117}
118
119int ev_add_fd(int fd, ev_callback cb, void* data) {
120 if (ev_misc_count == MAX_MISC_FDS || cb == NULL) {
121 return -1;
122 }
123
Elliott Hughes07cfb8f2015-04-10 13:12:05 -0700124 epoll_event ev;
Elliott Hughes07138192015-04-10 09:40:53 -0700125 ev.events = EPOLLIN | EPOLLWAKEUP;
126 ev.data.ptr = (void *)&ev_fdinfo[ev_count];
127 int ret = epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev);
128 if (!ret) {
129 ev_fdinfo[ev_count].fd = fd;
130 ev_fdinfo[ev_count].cb = cb;
131 ev_fdinfo[ev_count].data = data;
132 ev_count++;
133 ev_misc_count++;
134 }
135
136 return ret;
137}
138
139void 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
148int 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
156void ev_dispatch(void) {
157 for (int n = 0; n < npolledevents; n++) {
158 fd_info* fdi = reinterpret_cast<fd_info*>(polledevents[n].data.ptr);
159 ev_callback cb = fdi->cb;
160 if (cb) {
161 cb(fdi->fd, polledevents[n].events, fdi->data);
162 }
163 }
164}
165
Elliott Hughes07cfb8f2015-04-10 13:12:05 -0700166int ev_get_input(int fd, uint32_t epevents, input_event* ev) {
Elliott Hughes07138192015-04-10 09:40:53 -0700167 if (epevents & EPOLLIN) {
168 ssize_t r = read(fd, ev, sizeof(*ev));
169 if (r == sizeof(*ev)) {
170 return 0;
171 }
172 }
173 return -1;
174}
175
176int ev_sync_key_state(ev_set_key_callback set_key_cb, void* data) {
177 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
178 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];
179
180 for (size_t i = 0; i < ev_dev_count; ++i) {
181 memset(ev_bits, 0, sizeof(ev_bits));
182 memset(key_bits, 0, sizeof(key_bits));
183
184 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
185 continue;
186 }
187 if (!test_bit(EV_KEY, ev_bits)) {
188 continue;
189 }
190 if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) {
191 continue;
192 }
193
194 for (int code = 0; code <= KEY_MAX; code++) {
195 if (test_bit(code, key_bits)) {
196 set_key_cb(code, 1, data);
197 }
198 }
199 }
200
201 return 0;
202}
203
Elliott Hughes642aaa72015-04-10 12:47:46 -0700204void ev_iterate_available_keys(std::function<void(int)> f) {
Elliott Hughes07138192015-04-10 09:40:53 -0700205 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)];
206 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)];
207
208 for (size_t i = 0; i < ev_dev_count; ++i) {
209 memset(ev_bits, 0, sizeof(ev_bits));
210 memset(key_bits, 0, sizeof(key_bits));
211
212 // Does this device even have keys?
213 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) {
214 continue;
215 }
216 if (!test_bit(EV_KEY, ev_bits)) {
217 continue;
218 }
219
220 int rc = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits);
221 if (rc == -1) {
222 continue;
223 }
224
225 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) {
226 if (test_bit(key_code, key_bits)) {
Elliott Hughes642aaa72015-04-10 12:47:46 -0700227 f(key_code);
Elliott Hughes07138192015-04-10 09:40:53 -0700228 }
229 }
230 }
231}