On Thu, Jul 15, 2010 at 03:54:29PM +0530, Amit Nagal wrote: > >> 5) Is it possible to do I/O with a usb device endpoints using sysfs ? > > > > Depends on the i/o you want to do :) > > > > for eg to do usb bulk i/o with device bulk endpoints . How do you do such I/O using sysfs to a USB device? > >> 6) Upon a usb device plugin , which filesystem (usbfs or sysfs ) > >> provides ?the device information faster ? > > > > What is "faster"? ?What "device information" do you want to get? > > upon usb connect / disconnect , i want to extract device infomation > (VID /PID ) to match my device . > so i should scan /sys/bus/usb/devices or /proc/bus/usb/BBB/DDD . > which one provides the information first via descriptors file ? Neither, use libudev and your code will be notified when the kernel notifies userspace of a device showing up/going away. That happens first. Actually, libudev uses sysfs here, and both get created by the kernel at pretty much exactly the same time. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
