##
##
## USB DESCRIPTORS
##
##

# Originally by Vojtech Horky.

# USB configuration descriptor
# This is not the full configuration descriptor (i.e. with interface
# and endpoint descriptors included) but only the header. 
transform usb_configuration_descriptor_bare = struct {
	.bLength <- uint8; # assert bLength = 9
	.bDescriptorType <- uint8; # assert: bDescriptorType == 2
	.wTotalLength <- uint16le;
	.bNumInterfaces <- uint8;
	.bConfigurationValue <- uint8;
	.iConfiguration <- uint8;
	.bmAttributes <- uint8;
	.MaxPower <- uint8;
};

# USB interface descriptor
transform usb_interface_descriptor = struct {
	.bLength <- uint8; # assert bLength = 9
	.bDescriptorType <- uint8; # assert: bDescriptorType == 4
	.bInterfaceNumber <- uint8;
	.bAlternateSetting <- uint8;
	.bNumEndpoints <- uint8;
	.bInterfaceClass <- uint8;
	.bInterfaceSubClass <- uint8;
	.bInterfaceProtocol <- uint8;
	.iInterface <- uint8;
};

# USB endpoint descriptor
transform usb_endpoint_descriptor = struct {
	.bLength <- uint8; # assert bLength = 7
	.bDescriptorType <- uint8; # assert: bDescriptorType == 5
	.bEndpointAddress  <- uint8;
	.bmAttributes <- uint8;
	.wMaxPacketSize <- uint16le;
	.bInterval <- uint8;
};

# USB HID descriptor
transform usb_hid_descriptor = struct {
	.bLength <- uint8;
	.bDescriptorType <- uint8; # assert: bDescriptorType == 33
	.bcdHID <- uint16le;
	.bCountryCode <- uint8;
	.bNumDescriptors <- uint8;
	# Following is repeated bNumDescriptors times
	.bDescriptorType <- uint8;
	.wDescriptorLength <- uint16le;
};

# Fixed configuration for QEMU USB keyboard. 
transform qemu_usb_keyboard = struct {
	.configuration_descriptor <- usb_configuration_descriptor_bare;
	.interface_descriptor <- usb_interface_descriptor;
	.hid_descriptor <- usb_hid_descriptor;
	.endpoint_descriptor <- usb_endpoint_descriptor;
}; 

transform main = qemu_usb_keyboard;