Adding support for a USB device

[Dan Timis]

Hi,

I need help with supporting a particular USB device under wine.  I have 
to start by saying that although I am an experienced C/C++ programmer 
with some Linux experience, I have almost no Windows or wine experience.

The Windows code for which I need to provide support uses CreateFile() 
to get a handle to the device.  The name of the device is something 
like "\\.\MyDevice0" "\\.\MyDevice1" and so on.  Then, the code uses 
DeviceIoControl() to read and write from/to the device.  The 
requirement is not to change the windows code.

I looked through the wine code and I found this in device.c:

static const struct VxDInfo VxDList[]

I could add another entry into the table and write a deviceio handler 
(BOOL  (*deviceio)(DWORD, LPVOID, DWORD, LPVOID, DWORD, LPDWORD, 
LPOVERLAPPED);).  I wrote some test code in Linux using libusb reading 
and writing to the device so I know what to do inside the deviceio 
handler.

Is this the right approach?  If so, what do I need to do to get 
CreateFile to return the right handle?

Or should I write an external driver that gets loaded by wine?  If so, 
how would I do that?  What are the chances that the Windows driver for 
this device would just work with wine?

Thanks,

Dan Timis
Muse Research, Inc.

[Uwe Bonnes]

> > > > > "Dan" == Dan Timis <timis(a)museresearch.com> writes:

Dan> Hi, I need help with supporting a particular USB device under wine.
    Dan> I have to start by saying that although I am an experienced C/C++
    Dan> programmer with some Linux experience, I have almost no Windows or
    Dan> wine experience.

    Dan> The Windows code for which I need to provide support uses
    Dan> CreateFile() to get a handle to the device.  The name of the device
    Dan> is something like "\\.\MyDevice0" "\\.\MyDevice1" and so on.  Then,
    Dan> the code uses DeviceIoControl() to read and write from/to the
    Dan> device.  The requirement is not to change the windows code.

Probably MyDevice is read from the registry or retrieved in some way from
setupapi.dll  

    Dan> I looked through the wine code and I found this in device.c:

    Dan> static const struct VxDInfo VxDList[]

    Dan> I could add another entry into the table and write a deviceio
    Dan> handler (BOOL (*deviceio)(DWORD, LPVOID, DWORD, LPVOID, DWORD,
    Dan> LPDWORD, LPOVERLAPPED);).  I wrote some test code in Linux using
    Dan> libusb reading and writing to the device so I know what to do
    Dan> inside the deviceio handler.

    Dan> Is this the right approach?  If so, what do I need to do to get
    Dan> CreateFile to return the right handle?

The approach looks right to me.

Try first to fake the device name retrival by perhaps hardcoding an access
to /proc/bus/usb/...   

VxD registration needs to be implemented in a MS like way however at some
point. 

    Dan> Or should I write an external driver that gets loaded by wine?  If
    Dan> so, how would I do that?  What are the chances that the Windows
    Dan> driver for this device would just work with wine?

This would require some code changes as you win program needs to access the
driver.

Bye

-- 
Uwe Bonnes                bon(a)elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. [phone] -------- Fax. [phone] ----------