[Libusb-devel] Nokia SU-1B driver development

[Florian H. <fl...@ha...>]

Hi!

I just continued working on the Nokia SU-1B pen driver and captured a big USB 
log from windows (a transfer of about 7 pages with drawings). You can find 
all the files on: http://www.hackenberger.at/nokiapen/large_transfer/ . The 
"driver" which usbsnoop2libusb.pl spits out, fails on the 
URB_FUNCTION_SELECT_CONFIGURATION. This URB:

[112 ms]  >>>  URB 5 going down  >>>
-- URB_FUNCTION_SELECT_CONFIGURATION:
  ConfigurationDescriptor = 0xc1552190 (configure)
  ConfigurationDescriptor : bLength             = 9
  ConfigurationDescriptor : bDescriptorType     = 0x00000002
  ConfigurationDescriptor : wTotalLength        = 0x00000020
  ConfigurationDescriptor : bNumInterfaces      = 0x00000001
  ConfigurationDescriptor : bConfigurationValue = 0x00000001
  ConfigurationDescriptor : iConfiguration      = 0x00000000
  ConfigurationDescriptor : bmAttributes        = 0x000000c0
  ConfigurationDescriptor : MaxPower            = 0x00000001
  ConfigurationHandle     = 0xc1531820
  Interface[0]: Length            = 56
  Interface[0]: InterfaceNumber   = 0
  Interface[0]: AlternateSetting  = 0

is translated to the following libusb calls:

ret = usb_set_configuration(devh, 0x0000001);
printf("5 set configuration returned %d\n", ret);
ret = usb_set_altinterface(devh, 0);
printf("5 set alternate setting returned %d\n", ret);

the first call fails as follows:
5 set configuration returned -16

and the second call returns:
5 set alternate setting returned 0

The problem is that for example URB #659 which returns 1029 bytes according to 
usbsnoop.log, returns just 6 bytes using libusb. This is probably due to the 
failing call to usb_set_configuration(). 

Any suggestions how to fix that?

I've asked that before, but could it be that the Pen uses RNDIS to transfer 
the data? Given the binary windows driver, is it possible to find out if that 
holds?

Regards,
	Florian
-- 
Florian Hackenberger
student @
University of Technology
Graz, Austria
fl...@ha...
www.hackenberger.at