1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
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 <ctype.h>
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <getopt.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <sys/ioctl.h>
24 #include <sys/time.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27 #include <linux/videodev2.h>
28
29 #include "fd-util.h"
30 #include "util.h"
31
main(int argc,char * argv[])32 int main(int argc, char *argv[]) {
33 static const struct option options[] = {
34 { "help", no_argument, NULL, 'h' },
35 {}
36 };
37 _cleanup_close_ int fd = -1;
38 char *device;
39 struct v4l2_capability v2cap;
40 int c;
41
42 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
43
44 switch (c) {
45 case 'h':
46 printf("%s [-h,--help] <device file>\n\n"
47 "Video4Linux device identification.\n\n"
48 " -h Print this message\n",
49 program_invocation_short_name);
50 return 0;
51 case '?':
52 return -EINVAL;
53
54 default:
55 assert_not_reached();
56 }
57
58 device = argv[optind];
59 if (!device)
60 return 2;
61
62 fd = open(device, O_RDONLY);
63 if (fd < 0)
64 return 3;
65
66 if (ioctl(fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
67 int capabilities;
68 printf("ID_V4L_VERSION=2\n");
69 printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
70 printf("ID_V4L_CAPABILITIES=:");
71 if (v2cap.capabilities & V4L2_CAP_DEVICE_CAPS)
72 capabilities = v2cap.device_caps;
73 else
74 capabilities = v2cap.capabilities;
75 if ((capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0 ||
76 (capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) > 0)
77 printf("capture:");
78 if ((capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0 ||
79 (capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) > 0)
80 printf("video_output:");
81 if ((capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
82 printf("video_overlay:");
83 if ((capabilities & V4L2_CAP_AUDIO) > 0)
84 printf("audio:");
85 if ((capabilities & V4L2_CAP_TUNER) > 0)
86 printf("tuner:");
87 if ((capabilities & V4L2_CAP_RADIO) > 0)
88 printf("radio:");
89 printf("\n");
90 }
91
92 return 0;
93 }
94