Quoting Paul Smedley <p...@smedley.info>: > Hi All, > I'm working on adding support for USB scanners for Sane on OS/2. >=20 > OS/2 doesn't have libusb, but has a library usbcalls that provides=20 > similar functionality, albeit most of the calls use different syntax. >=20 > I have sane-find-scanner working now for most scanners, and have starte= d=20 > work on remaining functions in sanei_usb.c >=20 > One query I have though is about devname >=20 > I see in sanei_usb.h that the libusb format for this is libusb:busno:de= vno >=20 > Is this defined for all devices or just ones that sanei_usb_init thinks= =20 > are scanners?
It is defined for each usb device. Having this naming scheme allows the=20 OS to use the same functionality that applies to filenames for usb device= s. So the permissions on that filename can be used to indicate the permissio= ns for its associated usb device.=20 > I assume that the format of devname really isn't important - so long as= =20 > it's useful to the usb method being used (ie kernel, libusb or usbcalls= =20 > for OS/2) in determining which usb device is being attached to? >=20 > In which case, I could use usbcalls:deviceno or even just deviceno? For portability, it would be best to use just one system for all usb devi= ces within that operating system. This is a problem for the OS you are using= . > usbcalls doesn't just bus/deviceno - it just has a device number for=20 > each device attached. >=20 > Thanks for listening - I hope to have some patches (and probably some=20 > more questions!!) soonish :) >=20 > Cheers, >=20 > Paul. regards, Gerald --=20
