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 <fcntl.h> 19 #include <linux/input.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <string.h> 23 #include <sys/epoll.h> 24 #include <sys/ioctl.h> 25 #include <unistd.h> 26 27 #include <functional> 28 29 #include "minui/minui.h" 30 31 #define MAX_DEVICES 16 32 #define MAX_MISC_FDS 16 33 34 #define BITS_PER_LONG (sizeof(unsigned long) * 8) 35 #define BITS_TO_LONGS(x) (((x) + BITS_PER_LONG - 1) / BITS_PER_LONG) 36 37 struct fd_info { 38 int fd; 39 ev_callback cb; 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) { // NOLINT 53 return (array[bit/BITS_PER_LONG] & (1UL << (bit % BITS_PER_LONG))) != 0; 54 } 55 56 int ev_init(ev_callback input_cb, bool allow_touch_inputs) { 57 g_epoll_fd = epoll_create(MAX_DEVICES + MAX_MISC_FDS); 58 if (g_epoll_fd == -1) { 59 return -1; 60 } 61 62 bool epollctlfail = false; 63 DIR* dir = opendir("/dev/input"); 64 if (dir != nullptr) { 65 dirent* de; 66 while ((de = readdir(dir))) { 67 if (strncmp(de->d_name, "event", 5)) continue; 68 int fd = openat(dirfd(dir), de->d_name, O_RDONLY); 69 if (fd == -1) continue; 70 71 // Use unsigned long to match ioctl's parameter type. 72 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT 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. EV_ABS is also 81 // allowed if allow_touch_inputs is set. 82 if (!test_bit(EV_KEY, ev_bits) && !test_bit(EV_REL, ev_bits) && !test_bit(EV_SW, ev_bits)) { 83 if (!allow_touch_inputs || !test_bit(EV_ABS, ev_bits)) { 84 close(fd); 85 continue; 86 } 87 } 88 89 epoll_event ev; 90 ev.events = EPOLLIN | EPOLLWAKEUP; 91 ev.data.ptr = &ev_fdinfo[ev_count]; 92 if (epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) { 93 close(fd); 94 epollctlfail = true; 95 continue; 96 } 97 98 ev_fdinfo[ev_count].fd = fd; 99 ev_fdinfo[ev_count].cb = std::move(input_cb); 100 ev_count++; 101 ev_dev_count++; 102 if (ev_dev_count == MAX_DEVICES) break; 103 } 104 105 closedir(dir); 106 } 107 108 if (epollctlfail && !ev_count) { 109 close(g_epoll_fd); 110 g_epoll_fd = -1; 111 return -1; 112 } 113 114 return 0; 115 } 116 117 int ev_get_epollfd(void) { 118 return g_epoll_fd; 119 } 120 121 int ev_add_fd(int fd, ev_callback cb) { 122 if (ev_misc_count == MAX_MISC_FDS || cb == NULL) { 123 return -1; 124 } 125 126 epoll_event ev; 127 ev.events = EPOLLIN | EPOLLWAKEUP; 128 ev.data.ptr = static_cast<void*>(&ev_fdinfo[ev_count]); 129 int ret = epoll_ctl(g_epoll_fd, EPOLL_CTL_ADD, fd, &ev); 130 if (!ret) { 131 ev_fdinfo[ev_count].fd = fd; 132 ev_fdinfo[ev_count].cb = std::move(cb); 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 = static_cast<fd_info*>(polledevents[n].data.ptr); 160 const ev_callback& cb = fdi->cb; 161 if (cb) { 162 cb(fdi->fd, polledevents[n].events); 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(const ev_set_key_callback& set_key_cb) { 178 // Use unsigned long to match ioctl's parameter type. 179 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT 180 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT 181 182 for (size_t i = 0; i < ev_dev_count; ++i) { 183 memset(ev_bits, 0, sizeof(ev_bits)); 184 memset(key_bits, 0, sizeof(key_bits)); 185 186 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) { 187 continue; 188 } 189 if (!test_bit(EV_KEY, ev_bits)) { 190 continue; 191 } 192 if (ioctl(ev_fdinfo[i].fd, EVIOCGKEY(sizeof(key_bits)), key_bits) == -1) { 193 continue; 194 } 195 196 for (int code = 0; code <= KEY_MAX; code++) { 197 if (test_bit(code, key_bits)) { 198 set_key_cb(code, 1); 199 } 200 } 201 } 202 203 return 0; 204 } 205 206 void ev_iterate_available_keys(const std::function<void(int)>& f) { 207 // Use unsigned long to match ioctl's parameter type. 208 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)]; // NOLINT 209 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)]; // NOLINT 210 211 for (size_t i = 0; i < ev_dev_count; ++i) { 212 memset(ev_bits, 0, sizeof(ev_bits)); 213 memset(key_bits, 0, sizeof(key_bits)); 214 215 // Does this device even have keys? 216 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) { 217 continue; 218 } 219 if (!test_bit(EV_KEY, ev_bits)) { 220 continue; 221 } 222 223 int rc = ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_KEY, KEY_MAX), key_bits); 224 if (rc == -1) { 225 continue; 226 } 227 228 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) { 229 if (test_bit(key_code, key_bits)) { 230 f(key_code); 231 } 232 } 233 } 234 } 235 236 void ev_iterate_touch_inputs(const std::function<void(int)>& action) { 237 for (size_t i = 0; i < ev_dev_count; ++i) { 238 // Use unsigned long to match ioctl's parameter type. 239 unsigned long ev_bits[BITS_TO_LONGS(EV_MAX)] = {}; // NOLINT 240 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits) == -1) { 241 continue; 242 } 243 if (!test_bit(EV_ABS, ev_bits)) { 244 continue; 245 } 246 247 unsigned long key_bits[BITS_TO_LONGS(KEY_MAX)] = {}; // NOLINT 248 if (ioctl(ev_fdinfo[i].fd, EVIOCGBIT(EV_ABS, KEY_MAX), key_bits) == -1) { 249 continue; 250 } 251 252 for (int key_code = 0; key_code <= KEY_MAX; ++key_code) { 253 if (test_bit(key_code, key_bits)) { 254 action(key_code); 255 } 256 } 257 } 258 } 259
