'\" t
.\"     Title: usb_altnum_to_altsetting
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: USB Core APIs
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "USB_ALTNUM_TO_ALTSET" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "USB Core APIs"
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.SH "NAME"
usb_altnum_to_altsetting \- get the altsetting structure with a given alternate setting number\&.
.SH "SYNOPSIS"
.HP \w'struct\ usb_host_interface\ *\ usb_altnum_to_altsetting('u
.BI "struct usb_host_interface * usb_altnum_to_altsetting(const\ struct\ usb_interface\ *\ " "intf" ", unsigned\ int\ " "altnum" ");"
.SH "ARGUMENTS"
.PP
\fIintf\fR
.RS 4
the interface containing the altsetting in question
.RE
.PP
\fIaltnum\fR
.RS 4
the desired alternate setting number
.RE
.SH "DESCRIPTION"
.PP
This searches the altsetting array of the specified interface for an entry with the correct bAlternateSetting value\&.
.PP
Note that altsettings need not be stored sequentially by number, so it would be incorrect to assume that the first altsetting entry in the array corresponds to altsetting zero\&. This routine helps device drivers avoid such mistakes\&.
.PP
Don\*(Aqt call this function unless you are bound to the intf interface or you have locked the device!
.SH "RETURN"
.PP
A pointer to the entry of the altsetting array of
\fIintf\fR
that has
\fIaltnum\fR
as the alternate setting number\&.
\fBNULL\fR
if not found\&.
.SH "COPYRIGHT"
.br