+
+out:
+ return res;
+}
+
+int main(int argc, char *argv[]) {
+ char default_filename[] = "firmware.bin";
+ char *filename = default_filename;
+ int ret = 0;
+
+ if (argc == 2) {
+ filename = argv[1];
+ }
+
+ FILE *fw = fopen(filename, "rb");
+ if (fw == NULL) {
+ fprintf(stderr, "Failed to open %s: %s\n", filename, strerror(errno));
+ return -errno;
+ }
+
+ ret = libusb_init(NULL);
+ if (ret < 0) {
+ fprintf(stderr, "libusb_init failed: %s\n",
+ libusb_error_name(ret));
+ goto out;
+ }
+
+ libusb_set_debug(NULL, 3);
+
+ dev = libusb_open_device_with_vid_pid(NULL, KINECT_AUDIO_VID, KINECT_AUDIO_PID);
+ if (dev == NULL) {
+ fprintf(stderr, "libusb_open failed: %s\n", strerror(errno));
+ ret = -errno;
+ goto out_libusb_exit;
+ }
+
+ int current_configuration = -1;
+ ret = libusb_get_configuration(dev, ¤t_configuration);
+ if (ret < 0) {
+ fprintf(stderr, "libusb_get_configuration failed: %s\n",
+ libusb_error_name(ret));
+ goto out_libusb_close;
+ }
+
+ if (current_configuration != KINECT_AUDIO_CONFIGURATION) {
+ ret = libusb_set_configuration(dev, KINECT_AUDIO_CONFIGURATION);
+ if (ret < 0) {
+ fprintf(stderr, "libusb_set_configuration failed: %s\n",
+ libusb_error_name(ret));
+ fprintf(stderr, "Cannot set configuration %d\n",
+ KINECT_AUDIO_CONFIGURATION);
+ goto out_libusb_close;
+ }
+ }
+
+ libusb_set_auto_detach_kernel_driver(dev, 1);
+
+ ret = libusb_claim_interface(dev, KINECT_AUDIO_INTERFACE);
+ if (ret < 0) {
+ fprintf(stderr, "libusb_claim_interface failed: %s\n",
+ libusb_error_name(ret));
+ fprintf(stderr, "Cannot claim interface %d\n",
+ KINECT_AUDIO_INTERFACE);
+ goto out_libusb_close;
+ }
+
+ /*
+ * Checking that the configuration has not changed, as suggested in
+ * http://libusb.sourceforge.net/api-1.0/caveats.html
+ */
+ current_configuration = -1;
+ ret = libusb_get_configuration(dev, ¤t_configuration);
+ if (ret < 0) {
+ fprintf(stderr, "libusb_get_configuration after claim failed: %s\n",
+ libusb_error_name(ret));
+ goto out_libusb_release_interface;
+ }
+
+ if (current_configuration != KINECT_AUDIO_CONFIGURATION) {
+ fprintf(stderr, "libusb configuration changed (expected: %d, current: %d)\n",
+ KINECT_AUDIO_CONFIGURATION, current_configuration);
+ ret = -EINVAL;
+ goto out_libusb_release_interface;
+ }
+
+ ret = upload_firmware(fw);