On Wed, May 30, 2001, Ben Bridgwater <bennyb@xxxxxxxxx> wrote: > Gerd Knorr wrote: > > > > One problem is that as things stand for some drivers read() is the only > > > supported interface so needs to be as efficient as possible. > > > > Do such drivers exist? > > I'm going by memory from old stuff on the list here, so I may be mistaken, but > I thought that bttv was somewhat the exception in terms of supporting mmap, or > am I just thinking of DMA? Do the USB cams support mmap? Yes, but it's not for efficiency reasons. I originally added it since the only clients I could find at the time only supported mmap (as well as only understood RGB). JE
