centos man page for usb_function_deactivate

USB_FUNCTION_DEACTIV(9) 				      Kernel Mode Gadget API					   USB_FUNCTION_DEACTIV(9)

NAME
       usb_function_deactivate - prevent function and gadget enumeration

SYNOPSIS
       int usb_function_deactivate(struct usb_function * function);

ARGUMENTS
       function
	   the function that isn't yet ready to respond

DESCRIPTION
       Blocks response of the gadget driver to host enumeration by preventing the data line pullup from being activated. This is normally called
       during bind() processing to change from the initial "ready to respond" state, or when a required resource becomes available.

       For example, drivers that serve as a passthrough to a userspace daemon can block enumeration unless that daemon (such as an OBEX, MTP, or
       print server) is ready to handle host requests.

       Not all systems support software control of their USB peripheral data pullups.

       Returns zero on success, else negative errno.

AUTHOR
       David Brownell <dbrownell@users.sourceforge.net>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   USB_FUNCTION_DEACTIV(9)