On Fri, Dec 06, 2013 at 11:37:34AM -0500, Dave Mielke wrote: > I'm using kernel 3.11.4-101.fc18.x86_64 on a 64-bit Fedora 19 system. > > I'd very much appreciate a bit of help from someone who understands the > CP2102 > serial adapter support. When I access it through /dev/ttyUSB0, it works fine. > When, however, I access it through usbfs, it doesn't seem to be working. When > I > study the usbmon output for both methods, they look to be effectively the > same. > I've attached the two usbmon traces to this message (as usbmon-ttyUSB0 and > usbmon-usbfs).
How are you accessing the device through usbfs? At that point, it's a "raw" USB device, the driver isn't connected and you now have to emulate the driver entirely from userspace, writing a whole new "userspace driver" for the device. Why are you doing that? Anyway, the source is all there for the kernel driver, if you wish to reimplement it as a userspace program, you really are on your own, sorry. good luck, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
