static int lusb_open(void **driver,
struct bladerf_devinfo *info_in,
struct bladerf_devinfo *info_out)
{
int status;
struct bladerf_lusb *lusb = NULL;
libusb_context *context;
/* Initialize libusb for device tree walking */
status = libusb_init(&context);
if (status) {
log_error("Could not initialize libusb: %s\n",
libusb_error_name(status));
return error_conv(status);
}
/* We can only print this out when log output is enabled, or else we'll
* get snagged by -Werror=unused-but-set-variable */
# ifdef LOGGING_ENABLED
{
char buf[64];
get_libusb_version(buf, sizeof(buf));
log_verbose("Using libusb version: %s\n", buf);
}
# endif
status = find_and_open_device(context, info_in, &lusb, info_out);
if (status != 0) {
libusb_exit(context);
if (status == BLADERF_ERR_NODEV) {
log_debug("No devices available on the libusb backend.\n");
} else {
log_debug("Failed to open bladeRF on libusb backend: %s\n",
bladerf_strerror(status));
}
} else {
assert(lusb != NULL);
/* Cosmin and Marian from Null Team (null.ro) and YateBTS(.com) found
* that it is possible to recover from "Issue #95: Not enough bandwidth
* for altsetting" by performing a USB port reset prior to actually
* trying to use the device.
*/
# if ENABLE_USB_DEV_RESET_ON_OPEN
if (bladerf_usb_reset_device_on_open) {
status = reset_and_reopen(context, &lusb, info_out);
}
# endif
if (status == 0) {
*driver = (void *) lusb;
}
}
return status;
}
static int reset_and_reopen(libusb_context *context,
struct bladerf_lusb **dev,
struct bladerf_devinfo *info)
{
int status;
status = libusb_reset_device((*dev)->handle);
if (status == 0) {
log_verbose("USB port reset succeeded for bladeRF %s\n", info->serial);
return 0;
} else if (status == LIBUSB_ERROR_NO_DEVICE) {
struct bladerf_devinfo new_info;
/* The reset has caused the device to drop out and re-enumerate.
*
* We'll find it again via the info we gathered about it via its
* serial number, which is now stored in the devinfo
*/
log_verbose("Re-scan required after port reset for bladeRF %s\n",
info->serial);
libusb_release_interface((*dev)->handle, 0);
libusb_close((*dev)->handle);
#if 1 == BLADERF_OS_WINDOWS
ReleaseMutex((*dev)->mutex);
#endif // BLADERF_OS_WINDOWS
*dev = NULL;
memcpy(&new_info, info, sizeof(new_info));
new_info.usb_bus = DEVINFO_BUS_ANY;
new_info.usb_addr = DEVINFO_ADDR_ANY;
status = find_and_open_device(context, &new_info, dev, info);
} else {
status = BLADERF_ERR_IO;
log_verbose("Port reset failed for bladerf %s: %s\n",
info->serial, libusb_error_name(status));
}
return status;
}
