Le Vendredi 10 Février 2006 09:09, Greg KH a écrit : > On Thu, Feb 09, 2006 at 11:52:46PM -0800, David Brownell wrote: > > On Thursday 09 February 2006 12:32 am, Martin Diehl wrote: > > > On Wed, 8 Feb 2006, Greg KH wrote: > > > > > Driver needs to deal with several configurations with multiple > > > > > interfaces each. Custom-designed protocol. Both bulk and iso > > > > > endpoints with latency requirements. Not hard realtime, but > > > > > response time is critical which became tricky when sharing locks > > > > > f.e. > > > > > > > > Response time to incomming packets (to turn around and send something > > > > else out?), or response time for something else (queuing, etc.)? > > > > > > Queueing was one issue. > > > > In what sense? You _can_ queue through usbfs, though I'd rather just > > see the normal AIO calls work there ... lower overhead, simpler, etc. > > Yeah, I'm thinking it's time to dust off the design for usbfs2 soon :) > > thanks, > > greg k-h > > Until usbfs2 come out, is there, somewhere, some sample code to deal with iso packet in userspace? maybe usbfs can be used for GPL webcams driver to :) Best regards -- Michel Xhaard http://mxhaard.free.fr
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