'\" t
.\"     Title: usb_function_deactivate
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Kernel Mode Gadget API
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "USB_FUNCTION_DEACTIV" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Kernel Mode Gadget API"
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.SH "NAME"
usb_function_deactivate \- prevent function and gadget enumeration
.SH "SYNOPSIS"
.HP \w'int\ usb_function_deactivate('u
.BI "int usb_function_deactivate(struct\ usb_function\ *\ " "function" ");"
.SH "ARGUMENTS"
.PP
\fIfunction\fR
.RS 4
the function that isn\*(Aqt yet ready to respond
.RE
.SH "DESCRIPTION"
.PP
Blocks response of the gadget driver to host enumeration by preventing the data line pullup from being activated\&. This is normally called during
\fIbind\fR() processing to change from the initial
\(lqready to respond\(rq
state, or when a required resource becomes available\&.
.PP
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\&.
.PP
Not all systems support software control of their USB peripheral data pullups\&.
.PP
Returns zero on success, else negative errno\&.
.SH "AUTHOR"
.PP
\fBDavid Brownell\fR <\&dbrownell@users.sourceforge.net\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br