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+/*
+ * UVC gadget test application
+ *
+ * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ */
+
+#include <signal.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "configfs.h"
+#include "events.h"
+#include "stream.h"
+
+static void usage(const char *argv0)
+{
+ fprintf(stderr, "Usage: %s [options] <uvc device>\n", argv0);
+ fprintf(stderr, "Available options are\n");
+ fprintf(stderr, " -c device V4L2 source device\n");
+ fprintf(stderr, " -h Print this help screen and exit\n");
+ fprintf(stderr, " -i image MJPEG image\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, " <uvc device> UVC device instance specifier\n");
+ fprintf(stderr, "\n");
+
+ fprintf(stderr, " For ConfigFS devices the <uvc device> parameter can take the form of a shortened\n");
+ fprintf(stderr, " function specifier such as: 'uvc.0', or if multiple gadgets are configured, the\n");
+ fprintf(stderr, " gadget name should be included to prevent ambiguity: 'g1/functions/uvc.0'.\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, " For legacy g_webcam UVC instances, this parameter will identify the UDC that the\n");
+ fprintf(stderr, " UVC function is bound to.\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, " The parameter is optional, and if not provided the first UVC function on the first\n");
+ fprintf(stderr, " gadget identified will be used.\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, "Example usage:\n");
+ fprintf(stderr, " uvc-gadget uvc.1\n");
+ fprintf(stderr, " uvc-gadget g1/functions/uvc.1\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, " uvc-gadget musb-hdrc.0.auto\n");
+}
+
+/* Necessary for and only used by signal handler. */
+static struct events *sigint_events;
+
+static void sigint_handler(int signal __attribute__((__unused__)))
+{
+ /* Stop the main loop when the user presses CTRL-C */
+ events_stop(sigint_events);
+}
+
+int main(int argc, char *argv[])
+{
+ char *function = NULL;
+ char *cap_device = "/dev/video1";
+ struct uvc_function_config *fc;
+ struct uvc_stream *stream;
+ struct events events;
+ int ret = 0;
+ int opt;
+
+ while ((opt = getopt(argc, argv, "c:h")) != -1) {
+ switch (opt) {
+ case 'c':
+ cap_device = optarg;
+ break;
+
+ case 'h':
+ usage(argv[0]);
+ return 0;
+
+ default:
+ fprintf(stderr, "Invalid option '-%c'\n", opt);
+ usage(argv[0]);
+ return 1;
+ }
+ }
+
+ if (argv[optind] != NULL)
+ function = argv[optind];
+
+ fc = configfs_parse_uvc_function(function);
+ if (!fc) {
+ printf("Failed to identify function configuration\n");
+ return 1;
+ }
+
+ /*
+ * Create the events handler. Register a signal handler for SIGINT,
+ * received when the user presses CTRL-C. This will allow the main loop
+ * to be interrupted, and resources to be freed cleanly.
+ */
+ events_init(&events);
+
+ sigint_events = &events;
+ signal(SIGINT, sigint_handler);
+
+ /* Create and initialise the stream. */
+ stream = uvc_stream_new(fc->video, cap_device);
+ if (stream == NULL) {
+ ret = 1;
+ goto done;
+ }
+
+ uvc_stream_init_uvc(stream, fc);
+ uvc_stream_set_event_handler(stream, &events);
+
+ /* Main capture loop */
+ events_loop(&events);
+
+done:
+ /* Cleanup */
+ uvc_stream_delete(stream);
+ events_cleanup(&events);
+ configfs_free_uvc_function(fc);
+
+ return ret;
+}