src/udev/v4l_id/v4l_id.c

   1 /*
   2  * Copyright (C) 2009 Kay Sievers <kay@vrfy.org>
   3  * Copyright (c) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details:
  14  */
  15
  16 #include <stdio.h>
  17 #include <errno.h>
  18 #include <string.h>
  19 #include <ctype.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <getopt.h>
  24 #include <sys/types.h>
  25 #include <sys/time.h>
  26 #include <sys/ioctl.h>
  27 #include <linux/videodev2.h>
  28
  29 #include "util.h"
  30
  31 int main(int argc, char *argv[]) {
  32         static const struct option options[] = {
  33                 { "help", no_argument, NULL, 'h' },
  34                 {}
  35         };
  36         _cleanup_close_ int fd = -1;
  37         char *device;
  38         struct v4l2_capability v2cap;
  39         int c;
  40
  41         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
  42
  43                 switch (c) {
  44                 case 'h':
  45                         printf("%s [-h,--help] <device file>\n\n"
  46                                "Video4Linux device identification.\n\n"
  47                                "  -h  Print this message\n"
  48                                , program_invocation_short_name);
  49                         return 0;
  50                 case '?':
  51                         return -EINVAL;
  52
  53                 default:
  54                         assert_not_reached("Unhandled option");
  55                 }
  56
  57         device = argv[optind];
  58         if (device == NULL)
  59                 return 2;
  60
  61         fd = open(device, O_RDONLY);
  62         if (fd < 0)
  63                 return 3;
  64
  65         if (ioctl(fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
  66                 printf("ID_V4L_VERSION=2\n");
  67                 printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
  68                 printf("ID_V4L_CAPABILITIES=:");
  69                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0)
  70                         printf("capture:");
  71                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0)
  72                         printf("video_output:");
  73                 if ((v2cap.capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
  74                         printf("video_overlay:");
  75                 if ((v2cap.capabilities & V4L2_CAP_AUDIO) > 0)
  76                         printf("audio:");
  77                 if ((v2cap.capabilities & V4L2_CAP_TUNER) > 0)
  78                         printf("tuner:");
  79                 if ((v2cap.capabilities & V4L2_CAP_RADIO) > 0)
  80                         printf("radio:");
  81                 printf("\n");
  82         }
  83
  84         return 0;
  85 }