return -errno;
}
- libusb_init(NULL);
+ 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, "Couldn't open device.\n");
- ret = -ENODEV;
- goto fail_libusb_open;
+ fprintf(stderr, "libusb_open failed: %s\n", strerror(errno));
+ ret = -errno;
+ goto out_libusb_exit;
}
int current_configuration = -1;
- libusb_get_configuration(dev, ¤t_configuration);
- if (current_configuration != KINECT_AUDIO_CONFIGURATION)
- libusb_set_configuration(dev, KINECT_AUDIO_CONFIGURATION);
+ 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_claim_interface(dev, KINECT_AUDIO_INTERFACE);
+ 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;
- libusb_get_configuration(dev, ¤t_configuration);
+ 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) {
- ret = -ENODEV;
- goto cleanup;
+ 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);
// Now the device reenumerates.
-cleanup:
+out_libusb_release_interface:
libusb_release_interface(dev, KINECT_AUDIO_INTERFACE);
+out_libusb_close:
libusb_close(dev);
-fail_libusb_open:
+out_libusb_exit:
libusb_exit(NULL);
+out:
fclose(fw);
return ret;
}