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[thirdparty/systemd.git] / src / udev / v4l_id / v4l_id.c
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f13467ec 1/* SPDX-License-Identifier: GPL-2.0-or-later */
c5a9680e 2/*
c5a9680e 3 * Copyright (c) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
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4 */
5
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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"
908b0ea1 13#include "errno-util.h"
3ffd4af2 14#include "fd-util.h"
93a1f792 15#include "log.h"
6fecd78c 16#include "main-func.h"
5ac0162c 17
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18static const char *arg_device = NULL;
19
20static int parse_argv(int argc, char *argv[]) {
912541b0 21 static const struct option options[] = {
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22 { "help", no_argument, NULL, 'h' },
23 { "version", no_argument, NULL, 'v' },
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24 {}
25 };
fadce6ca 26 int c;
c5a9680e 27
fadce6ca 28 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
fadce6ca 29 switch (c) {
912541b0 30 case 'h':
6fecd78c 31 printf("%s [OPTIONS...] DEVICE\n\n"
5ac0162c 32 "Video4Linux device identification.\n\n"
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33 " -h --help Show this help text\n"
34 " --version Show package version\n",
bc556335 35 program_invocation_short_name);
912541b0 36 return 0;
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37 case 'v':
38 return version();
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39 case '?':
40 return -EINVAL;
912541b0 41 default:
04499a70 42 assert_not_reached();
912541b0 43 }
c5a9680e 44
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45 if (!argv[optind])
46 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
47 "DEVICE argument missing.");
48
49 arg_device = argv[optind];
50 return 1;
51}
fadce6ca 52
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53static int run(int argc, char *argv[]) {
54 _cleanup_close_ int fd = -EBADF;
55 struct v4l2_capability v2cap;
56 int r;
57
58 r = parse_argv(argc, argv);
59 if (r <= 0)
60 return r;
61
42fff80c 62 fd = open(arg_device, O_RDONLY|O_CLOEXEC|O_NOCTTY);
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63 if (fd < 0) {
64 bool ignore = ERRNO_IS_DEVICE_ABSENT(errno);
65 log_full_errno(ignore ? LOG_DEBUG : LOG_WARNING, errno,
66 "Failed to open device node '%s'%s: %m",
67 arg_device, ignore ? ", ignoring" : "");
68 return ignore ? 0 : -errno;
69 }
c5a9680e 70
5ac0162c 71 if (ioctl(fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
64687610 72 int capabilities;
6fecd78c 73
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74 printf("ID_V4L_VERSION=2\n");
75 printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
76 printf("ID_V4L_CAPABILITIES=:");
6fecd78c 77
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78 if (v2cap.capabilities & V4L2_CAP_DEVICE_CAPS)
79 capabilities = v2cap.device_caps;
80 else
81 capabilities = v2cap.capabilities;
6fecd78c 82
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83 if ((capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0 ||
84 (capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) > 0)
912541b0 85 printf("capture:");
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86 if ((capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0 ||
87 (capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) > 0)
912541b0 88 printf("video_output:");
64687610 89 if ((capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
912541b0 90 printf("video_overlay:");
64687610 91 if ((capabilities & V4L2_CAP_AUDIO) > 0)
912541b0 92 printf("audio:");
64687610 93 if ((capabilities & V4L2_CAP_TUNER) > 0)
912541b0 94 printf("tuner:");
64687610 95 if ((capabilities & V4L2_CAP_RADIO) > 0)
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96 printf("radio:");
97 printf("\n");
98 }
c5a9680e 99
912541b0 100 return 0;
c5a9680e 101}
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102
103DEFINE_MAIN_FUNCTION(run);