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 <errno.h> 19 #include <fcntl.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <string.h> 23 #include <sys/epoll.h> 24 #include <unistd.h> 25 26 #include <linux/input.h> 27 28 #include "minui.h" 29 30 #define MAX_DEVICES 16 31 #define MAX_MISC_FDS 16 32 33 #define BITS_PER_LONG (sizeof(unsigned long) * 8) 34 #define BITS_TO_LONGS(x) (((x) + BITS_PER_LONG - 1) / BITS_PER_LONG) 35 36 struct fd_info { 37 int fd; 38 ev_callback cb; 39 void* data; 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 52 static bool test_bit(size_t bit, unsigned long* array) { 53 return (array[bit/BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0; 54 } 55 56 int ev_init(ev_callback input_cb, void* data) { 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 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; 69 70 // fprintf(stderr,"/dev/input/%s\n", de->d_name); 71 if (strncmp(de->d_name, "event", 5)) continue; 72 int fd = openat(dirfd(dir), de->d_name, O_RDONLY); 73 if (fd == -1) continue; 74 75 // Read the evbits of the input device. 76 if (ioctl(fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) { 77 close(fd); 78 continue; 79 } 80 81 // We assume that only EV_KEY, EV_REL, and EV_SW event types are ever needed. 82 if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) { 83 close(fd); 84 continue; 85 } 86 87 epoll_event ev; 88 ev.events = EPOLLIN | EPOLLWAKEUP; 89 ev.data.ptr = &ev_fdinfo[ev_count]; 90 if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) { 91 close(fd); 92 epollctlfail = true; 93 continue; 94 } 95 96 ev_fdinfo[ev_count].fd = fd; 97 ev_fdinfo[ev_count].cb = input_cb; 98 ev_fdinfo[ev_count].data = data; 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 } 115 116 int ev_get_epollfd(void) { 117 return g_epoll_fd; 118 } 119 120 int ev_add_fd(int fd, ev_callback cb, void* data) { 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 = (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 = cb; 132 ev_fdinfo[ev_count].data = data; 133 ev_count++; 134 ev_misc_count++; 135 } 136 137 return ret; 138 } 139 140 void ev_exit(void) { 141 while (ev_count > 0) { 142 close(ev_fdinfo[--ev_count].fd); 143 } 144 ev_misc_count = 0; 145 ev_dev_count = 0; 146 close(g_epoll_fd); 147 } 148 149 int ev_wait(int timeout) { 150 npolledevents = epoll_wait(g_epoll_fd, polledevents, ev_count, timeout); 151 if (npolledevents <= 0) { 152 return -1; 153 } 154 return 0; 155 } 156 157 void ev_dispatch(void) { 158 for (int n = 0; n < npolledevents; n++) { 159 fd_info* fdi = reinterpret_cast<fd_info*>(polledevents[n].data.ptr); 160 ev_callback cb = fdi->cb; 161 if (cb) { 162 cb(fdi->fd, polledevents[n].events, fdi->data); 163 } 164 } 165 } 166 167 int ev_get_input(int fd, uint32_t epevents, input_event* ev) { 168 if (epevents & EPOLLIN) { 169 ssize_t r = TEMP_FAILURE_RETRY(read(fd, ev, sizeof(*ev))); 170 if (r == sizeof(*ev)) { 171 return 0; 172 } 173 } 174 return -1; 175 } 176 177 int ev_sync_key_state(ev_set_key_callback set_key_cb, void* data) { 178 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; 179 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; 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, data); 198 } 199 } 200 } 201 202 return 0; 203 } 204 205 void ev_iterate_available_keys(std::function<void(int)> f) { 206 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; 207 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; 208 209 for (size_t i = 0; i < ev_dev_count; ++i) { 210 memset(ev_bits, 0, sizeof(ev_bits)); 211 memset(key_bits, 0, sizeof(key_bits)); 212 213 // Does this device even have keys? 214 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) { 215 continue; 216 } 217 if (!test_bit(EV_KEY, ev_bits)) { 218 continue; 219 } 220 221 int rc = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits); 222 if (rc == -1) { 223 continue; 224 } 225 226 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) { 227 if (test_bit(key_code, key_bits)) { 228 f(key_code); 229 } 230 } 231 } 232 } 233
