USB_DRIVER_SET_CONFI(9)                   USB Core APIs                   USB_DRIVER_SET_CONFI(9)



NAME
       usb_driver_set_configuration - Provide a way for drivers to change device configurations

SYNOPSIS
       int usb_driver_set_configuration(struct usb_device * udev, int config);

ARGUMENTS
       udev
           the device whose configuration is being updated

       config
           the configuration being chosen.

CONTEXT
       In process context, must be able to sleep

DESCRIPTION
       Device interface drivers are not allowed to change device configurations. This is because
       changing configurations will destroy the interface the driver is bound to and create new
       ones; it would be like a floppy-disk driver telling the computer to replace the
       floppy-disk drive with a tape drive!

       Still, in certain specialized circumstances the need may arise. This routine gets around
       the normal restrictions by using a work thread to submit the change-config request.

RETURN
       0 if the request was successfully queued, error code otherwise. The caller has no way to
       know whether the queued request will eventually succeed.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   USB_DRIVER_SET_CONFI(9)