On Mon, Apr 16, 2007 at 06:38:15PM -0400, Adam Kropelin wrote: > Sarah Bailey wrote: > >On Tue, Apr 03, 2007 at 10:58:06AM -0400, Mike Panetta wrote: > >>I just went to the sourceforge page to see if there was a newer > >>version > >>supporting asynch io for more efficient bulk xfers on high speed > >>devices, but it looks like there has not been any development in over > >>a > >>year, even in CVS. Is the project dead? Is there now a different > >>way > >>to do USB drivers from user-space? > > > >There will be a new way to write USB drivers from userspace in a > >couple > >months. usbfs is slowly being replaced by a new usb file system, > >usbfs2. Eventually, user-space USB drivers will just use usbfs2, and > >libusb won't be needed anymore. > > I disagree. Either you misunderstand libusb or I misunderstand usbfs2. I > suspect the former ;) > > As I understand it, usbfs2 is a "simpler" API than the current usbfs.
Simplier, and a little better designed than usbfs. It represents endpoints as separate files, so the program can issue read and write calls rather than messing with ioctls. > That's nice, but the complexity of usbfs is not the only reason libusb > exists. In fact I'd argue it's not even the most important reason. What > *is* the most important reason? Cross-platform compatibility. Yes, libusb is important for cross-platform compatibility. libusb could be reworked to use usbfs2. However, it seems like an unnecessary abstraction layer if you just want to write a userspace Linux USB driver (which is what I thought Mike was asking about). Sarah
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