u-tools/apps/android_port/libminui/events.c

   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 "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 }