bluetooth USB dongle firmware download

Question

I need to develop Bluetooth USB driver for my host controller.
Windows generic adapter driver (with bthusb.sys) should be used, but it has no firmware download function.
Should I develop new USB driver instead bthusb.sys（refer uart sample）or any way to add firmware download function based on Windows generic adapter driver?

Answer 1

You should write a device lower filter that sits below bthusb. You are not allowed to touch hardware in AddDevice, instead implement the firmware download in EvtDevicePrepareHardware().

Answer 2

can I put firmware download in filter driver's deviceAdd function,
Like the following sample code ?
Thank you for any help

Answer 3

Thank you

May I register the prepare hardware function in the bluetooth filter driver like the following code?

DriverEntry{
WDF_DRIVER_CONFIG_INIT(
&DriverConfig,
BthEchoSrvEvtDriverDeviceAdd
);

BthEchoSrvEvtDriverDeviceAdd
{
WDF_PNPPOWER_EVENT_CALLBACKS_INIT(&pnpPowerCallbacks);
pnpPowerCallbacks.EvtDevicePrepareHardware = BthFirmwareDownloadAndDeviceReset;
}

The usb driver in bthusb.sys has AddDevice, BthEchoSrvEvtDriverDeviceAdd was just a patch for it
download bluetooth controller firmware and restart the chip.