]> git.ipfire.org Git - thirdparty/systemd.git/blame - src/udev/v4l_id/v4l_id.c
tree-wide: Add more socket units (#37991)
[thirdparty/systemd.git] / src / udev / v4l_id / v4l_id.c
CommitLineData
f13467ec 1/* SPDX-License-Identifier: GPL-2.0-or-later */
c5a9680e 2/*
c5a9680e 3 * Copyright (c) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
c5a9680e
KS
4 */
5
c5a9680e
KS
6#include <fcntl.h>
7#include <getopt.h>
1cf40697 8#include <linux/videodev2.h>
cf0fbc49 9#include <stdio.h>
c5a9680e 10#include <sys/ioctl.h>
c5a9680e 11
5356761d 12#include "build.h"
3ffd4af2 13#include "fd-util.h"
93a1f792 14#include "log.h"
6fecd78c 15#include "main-func.h"
5ac0162c 16
6fecd78c
ZJS
17static const char *arg_device = NULL;
18
19static int parse_argv(int argc, char *argv[]) {
912541b0 20 static const struct option options[] = {
5356761d
ZJS
21 { "help", no_argument, NULL, 'h' },
22 { "version", no_argument, NULL, 'v' },
912541b0
KS
23 {}
24 };
fadce6ca 25 int c;
c5a9680e 26
fadce6ca 27 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
fadce6ca 28 switch (c) {
912541b0 29 case 'h':
6fecd78c 30 printf("%s [OPTIONS...] DEVICE\n\n"
5ac0162c 31 "Video4Linux device identification.\n\n"
5356761d
ZJS
32 " -h --help Show this help text\n"
33 " --version Show package version\n",
bc556335 34 program_invocation_short_name);
912541b0 35 return 0;
5356761d
ZJS
36 case 'v':
37 return version();
fadce6ca
ZJS
38 case '?':
39 return -EINVAL;
912541b0 40 default:
04499a70 41 assert_not_reached();
912541b0 42 }
c5a9680e 43
6fecd78c
ZJS
44 if (!argv[optind])
45 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
46 "DEVICE argument missing.");
47
48 arg_device = argv[optind];
49 return 1;
50}
fadce6ca 51
6fecd78c
ZJS
52static int run(int argc, char *argv[]) {
53 _cleanup_close_ int fd = -EBADF;
54 struct v4l2_capability v2cap;
55 int r;
56
57 r = parse_argv(argc, argv);
58 if (r <= 0)
59 return r;
60
42fff80c 61 fd = open(arg_device, O_RDONLY|O_CLOEXEC|O_NOCTTY);
912541b0 62 if (fd < 0)
6fecd78c 63 return log_error_errno(errno, "Failed to open %s: %m", arg_device);
c5a9680e 64
5ac0162c 65 if (ioctl(fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
64687610 66 int capabilities;
6fecd78c 67
912541b0
KS
68 printf("ID_V4L_VERSION=2\n");
69 printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
70 printf("ID_V4L_CAPABILITIES=:");
6fecd78c 71
64687610
MO
72 if (v2cap.capabilities & V4L2_CAP_DEVICE_CAPS)
73 capabilities = v2cap.device_caps;
74 else
75 capabilities = v2cap.capabilities;
6fecd78c 76
64687610
MO
77 if ((capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0 ||
78 (capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) > 0)
912541b0 79 printf("capture:");
64687610
MO
80 if ((capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0 ||
81 (capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) > 0)
912541b0 82 printf("video_output:");
64687610 83 if ((capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
912541b0 84 printf("video_overlay:");
64687610 85 if ((capabilities & V4L2_CAP_AUDIO) > 0)
912541b0 86 printf("audio:");
64687610 87 if ((capabilities & V4L2_CAP_TUNER) > 0)
912541b0 88 printf("tuner:");
64687610 89 if ((capabilities & V4L2_CAP_RADIO) > 0)
912541b0
KS
90 printf("radio:");
91 printf("\n");
92 }
c5a9680e 93
912541b0 94 return 0;
c5a9680e 95}
6fecd78c
ZJS
96
97DEFINE_MAIN_FUNCTION(run);