1 files changed, 113 insertions, 0 deletions
diff --git a/src/udev/v4l_id/v4l_id.c b/src/udev/v4l_id/v4l_id.c
new file mode 100644
index 0000000..30527e9
--- /dev/null
+++ b/src/udev/v4l_id/v4l_id.c
@@ -0,0 +1,113 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2009 Filippo Argiolas <filippo.argiolas@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details:
+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <linux/videodev2.h>
+
+#include "build.h"
+#include "fd-util.h"
+#include "main-func.h"
+
+static const char *arg_device = NULL;
+
+static int parse_argv(int argc, char *argv[]) {
+        static const struct option options[] = {
+                { "help",     no_argument, NULL, 'h' },
+                { "version",  no_argument, NULL, 'v' },
+                {}
+        };
+        int c;
+
+        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
+                switch (c) {
+                case 'h':
+                        printf("%s [OPTIONS...] DEVICE\n\n"
+                               "Video4Linux device identification.\n\n"
+                               "  -h --help     Show this help text\n"
+                               "     --version  Show package version\n",
+                               program_invocation_short_name);
+                        return 0;
+                case 'v':
+                        return version();
+                case '?':
+                        return -EINVAL;
+                default:
+                        assert_not_reached();
+                }
+
+        if (!argv[optind])
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "DEVICE argument missing.");
+
+        arg_device = argv[optind];
+        return 1;
+}
+
+static int run(int argc, char *argv[]) {
+        _cleanup_close_ int fd = -EBADF;
+        struct v4l2_capability v2cap;
+        int r;
+
+        r = parse_argv(argc, argv);
+        if (r <= 0)
+                return r;
+
+        fd = open(arg_device, O_RDONLY|O_CLOEXEC|O_NOCTTY);
+        if (fd < 0)
+                return log_error_errno(errno, "Failed to open %s: %m", arg_device);
+
+        if (ioctl(fd, VIDIOC_QUERYCAP, &v2cap) == 0) {
+                int capabilities;
+
+                printf("ID_V4L_VERSION=2\n");
+                printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
+                printf("ID_V4L_CAPABILITIES=:");
+
+                if (v2cap.capabilities & V4L2_CAP_DEVICE_CAPS)
+                        capabilities = v2cap.device_caps;
+                else
+                        capabilities = v2cap.capabilities;
+
+                if ((capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0 ||
+                    (capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) > 0)
+                        printf("capture:");
+                if ((capabilities & V4L2_CAP_VIDEO_OUTPUT) > 0 ||
+                    (capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) > 0)
+                        printf("video_output:");
+                if ((capabilities & V4L2_CAP_VIDEO_OVERLAY) > 0)
+                        printf("video_overlay:");
+                if ((capabilities & V4L2_CAP_AUDIO) > 0)
+                        printf("audio:");
+                if ((capabilities & V4L2_CAP_TUNER) > 0)
+                        printf("tuner:");
+                if ((capabilities & V4L2_CAP_RADIO) > 0)
+                        printf("radio:");
+                printf("\n");
+        }
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);