[Printing-architecture] Google Summer of Code 2014 - IPP-over-USB printer support - Joint project idea for OpenPrinting and the kernel

[Michael Sweet]

Greg,

We already unload the usblp driver - it isn't compatible with most of the multifunction printers out there today...


On Feb 26, 2014, at 6:02 PM, Greg KH <greg at kroah.com> wrote:

> On Tue, Feb 25, 2014 at 08:56:23PM -0500, Michael Sweet wrote:
>> Greg,
>> 
>> On Feb 25, 2014, at 8:47 PM, Greg KH <greg at kroah.com> wrote:
>>> ...
>>> So you want to do this as a userspace library talking directly to the
>>> USB device through usbfs/libusb?  Or should the kernel provide a basic
>>> "pipe-like" functionality to the hardware to make it easier for things
>>> to be queued up to the device?
>> 
>> libusb is enough.
>> 
>>> Is there a pointer to the spec somewhere so that I can see what is
>>> needed here?
>> 
>> http://www.usb.org/developers/devclass_docs
> 
> In reading the spec, it looks like some kernel code will have to be
> written, as the default configuration for the printer device will cause
> the usblp driver to bind to the device.  Are you thinking that libusb
> will just unbind the printer driver and take over from there?  Why not
> just use the kernel driver to expose another device node and have cups
> talk to that?
> 
> thanks,
> 
> greg k-h

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

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