On Sun, 11 Jan 2015, vichy wrote:

> hi all:
> usually the usb_driver is matched by usb_device_id or usb_dynids.
> But there is any of them above defined in usb fs driver.
> if so, what is usb fs driver used for when registered in the usb_init
> of core/usb.c?

usbfs is meant for userspace programs that want to control a USB 
device.  For example, libusb uses usbfs.

usbfs does not bind to devices based on any sort of device ID.  
Instead, it gets bound to a device whenever a user program opens a USB
device node (/dev/bus/usb/...).

Alan Stern

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