ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
if (ret != 0 || (unsigned int)transferred != len) {
- error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
- ret, transferred, len);
+ error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
+ libusb_error_name(ret), transferred, len);
return ret;
}
ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
if (ret != 0 || (unsigned int)transferred != len) {
- error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
- ret, transferred, len);
+ error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
+ libusb_error_name(ret), transferred, len);
return ret;
}
am7xxx_device **dev)
{
int ret;
+ int current_configuration;
*dev = find_device(ctx, device_index);
if (*dev == NULL) {
ret = libusb_open(usb_dev, &((*dev)->usb_device));
if (ret < 0) {
- debug(ctx, "libusb_open failed\n");
+ debug(ctx, "libusb_open failed: %s\n", libusb_error_name(ret));
goto out;
}
* to close it again before bailing out.
*/
- ret = libusb_set_configuration((*dev)->usb_device,
- (*dev)->desc->configuration);
- if (ret < 0) {
- debug(ctx, "libusb_set_configuration failed\n");
- debug(ctx, "Cannot set configuration %hhu\n",
- (*dev)->desc->configuration);
- goto out_libusb_close;
+ current_configuration = -1;
+ libusb_get_configuration((*dev)->usb_device, ¤t_configuration);
+ if (current_configuration != (*dev)->desc->configuration) {
+ ret = libusb_set_configuration((*dev)->usb_device,
+ (*dev)->desc->configuration);
+ if (ret < 0) {
+ debug(ctx, "libusb_set_configuration failed: %s\n",
+ libusb_error_name(ret));
+ debug(ctx, "Cannot set configuration %hhu\n",
+ (*dev)->desc->configuration);
+ goto out_libusb_close;
+ }
}
+ libusb_set_auto_detach_kernel_driver((*dev)->usb_device, 1);
+
ret = libusb_claim_interface((*dev)->usb_device,
(*dev)->desc->interface_number);
if (ret < 0) {
- debug(ctx, "libusb_claim_interface failed\n");
+ debug(ctx, "libusb_claim_interface failed: %s\n",
+ libusb_error_name(ret));
+ debug(ctx, "Cannot claim interface %hhu\n",
+ (*dev)->desc->interface_number);
+ 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)->usb_device, ¤t_configuration);
+ if (current_configuration != (*dev)->desc->configuration) {
+ debug(ctx, "libusb configuration changed\n");
debug(ctx, "Cannot claim interface %hhu\n",
(*dev)->desc->interface_number);
goto out_libusb_close;