func newDescriptor(dev *C.libusb_device) (*Descriptor, error) {
var desc C.struct_libusb_device_descriptor
if errno := C.libusb_get_device_descriptor(dev, &desc); errno < 0 {
return nil, usbError(errno)
}
// Enumerate configurations
var cfgs []ConfigInfo
for i := 0; i < int(desc.bNumConfigurations); i++ {
var cfg *C.struct_libusb_config_descriptor
if errno := C.libusb_get_config_descriptor(dev, C.uint8_t(i), &cfg); errno < 0 {
return nil, usbError(errno)
}
cfgs = append(cfgs, newConfig(dev, cfg))
C.libusb_free_config_descriptor(cfg)
}
return &Descriptor{
Bus: uint8(C.libusb_get_bus_number(dev)),
Address: uint8(C.libusb_get_device_address(dev)),
Spec: BCD(desc.bcdUSB),
Device: BCD(desc.bcdDevice),
Vendor: ID(desc.idVendor),
Product: ID(desc.idProduct),
Class: uint8(desc.bDeviceClass),
SubClass: uint8(desc.bDeviceSubClass),
Protocol: uint8(desc.bDeviceProtocol),
SerialNumber: getSerialNumber(dev, desc.iSerialNumber),
Configs: cfgs,
dev: dev,
}, nil
}
// Get the number of the bus that a device is connected to.
func (d *Device) GetBusNumber() uint8 {
return uint8(C.libusb_get_bus_number(d.me()))
}
// ID returns a string suitable for uniquely identifying the device.
func (d *Device) ID() string {
return fmt.Sprintf("%d:%d",
C.libusb_get_bus_number(d.dev),
C.libusb_get_device_address(d.dev))
}
func (dev *Device) GetDeviceAddress() (bus, addr int) {
bus = int(C.libusb_get_bus_number(dev.device))
addr = int(C.libusb_get_device_address(dev.device))
return
}