source: mainline/uspace/dist/src/bithenge/usbdesc.bh@ c12b2ae

##
##
## 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;