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 29 static struct pollfd ev_fds[MAX_DEVICES]; 30 static unsigned ev_count = 0; 31 32 int ev_init(void) 33 { 34 DIR *dir; 35 struct dirent *de; 36 int fd; 37 38 dir = opendir("/dev/input"); 39 if(dir != 0) { 40 while((de = readdir(dir))) { 41 // fprintf(stderr,"/dev/input/%s\n", de->d_name); 42 if(strncmp(de->d_name,"event",5)) continue; 43 fd = openat(dirfd(dir), de->d_name, O_RDONLY); 44 if(fd < 0) continue; 45 46 ev_fds[ev_count].fd = fd; 47 ev_fds[ev_count].events = POLLIN; 48 ev_count++; 49 if(ev_count == MAX_DEVICES) break; 50 } 51 } 52 53 return 0; 54 } 55 56 void ev_exit(void) 57 { 58 while (ev_count > 0) { 59 close(ev_fds[--ev_count].fd); 60 } 61 } 62 63 int ev_get(struct input_event *ev, unsigned dont_wait) 64 { 65 int r; 66 unsigned n; 67 68 do { 69 r = poll(ev_fds, ev_count, dont_wait ? 0 : -1); 70 71 if(r > 0) { 72 for(n = 0; n < ev_count; n++) { 73 if(ev_fds[n].revents & POLLIN) { 74 r = read(ev_fds[n].fd, ev, sizeof(*ev)); 75 if(r == sizeof(*ev)) return 0; 76 } 77 } 78 } 79 } while(dont_wait == 0); 80 81 return -1; 82 } 83
