[Libusb-devel] Converting Win32 code to libusb

[Yann R. <yan...@al...>]

Hello libusb gurus.

First of all, I would like to thank you for the nice library you have 
developed.

I am on the process of porting some Win32 code to libusb under Linux. 
The Win32 code basically uses CreateFile to open the device, followed by 
DeviceIOControl / ReadFile calls to configure / request / read the device.

I'm stuck with the DeviceIOControl calls which, I believe, should be 
mapped to libusb_control_transfer. The parameters however from one 
function prototype to the other, are quite different. I would appreciate 
if you could point me to the right direction to achieve this port. 
Following is an example of win32 call that works perfecly :

::DeviceIoControl(m_pDevice, CTL_CODE(FILE_DEVICE_UNKNOWN, 0x80E, 
METHOD_BUFFERED, FILE_READ_DATA), NULL, 0, &l_ui32DriverVersion, 
sizeof(l_ui32DriverVersion), &m_ui32BytesReturned, NULL)

I don't know how to fill the bmRequestType and bRequest parameters of 
libusb_control_transfer. I believe wValue should be 0x80E and wIndex 
should be 0.

Any help welcome,
Best regards,
Yann