'\" t
.\"     Title: usb_alloc_dev
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: USB Core APIs
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "USB_ALLOC_DEV" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "USB Core APIs"
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.SH "NAME"
usb_alloc_dev \- usb device constructor (usbcore\-internal)
.SH "SYNOPSIS"
.HP \w'struct\ usb_device\ *\ usb_alloc_dev('u
.BI "struct usb_device * usb_alloc_dev(struct\ usb_device\ *\ " "parent" ", struct\ usb_bus\ *\ " "bus" ", unsigned\ " "port1" ");"
.SH "ARGUMENTS"
.PP
\fIparent\fR
.RS 4
hub to which device is connected; null to allocate a root hub
.RE
.PP
\fIbus\fR
.RS 4
bus used to access the device
.RE
.PP
\fIport1\fR
.RS 4
one\-based index of port; ignored for root hubs
.RE
.SH "CONTEXT"
.PP
!\fBin_interrupt\fR
.SH "DESCRIPTION"
.PP
Only hub drivers (including virtual root hub drivers for host controllers) should ever call this\&.
.PP
This call may not be used in a non\-sleeping context\&.
.SH "RETURN"
.PP
On success, a pointer to the allocated usb device\&.
\fBNULL\fR
on failure\&.
.SH "COPYRIGHT"
.br