On Wed, 29 Jun 2005 09:55:49 -0400 (EDT) Alan Stern wrote: | On Tue, 28 Jun 2005, slashboot wrote: | | > Hello | > | > I'm writing a cups backend for an USB printer with prorietary status | > information. The USB standard status IOCTL (LPGETSTATUS) call works | > fine but to get further information about the printer I need to write | > a vendor specific command on the endpoint 0 and get a structure giving | > extended status of the printer. Windows usbprint driver implements a | > IOCTL_USBPRINT_VENDOR_GET_COMMAND macro that does this task. Linux | > driver apparently doesn't. | > | > First solution is to add a new IOCTL command and patch the usblp.c | > driver and make necessary calls. This solution will oblige the final | > user to recompile the kernel (module or builtin driver) which is not | > practical for most users. | | IMO this is your best option. In time the new ioctl will make its way | into the official kernel and then users won't need to do anything special. | | > Second solution is to write a new driver for the printer. This driver | > will relay on usb.h functions. Not a very easy task. | | And probably no easier for users than modifying the existing driver. | | > Third solution, and I'm not sure if it can be done : making the calls | > inside the cups backend (the backend is called with root priviliges). | | It's not clear going behind the back of the usb-lp driver is a good idea.
I agree with Alan's positions. One other possible option is to compare how HPOJ works and uses libusb for extended functionality. http://hpoj.sourceforge.net/ --- ~Randy ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
