'\" t
.\"     Title: usb_get_status
.\"    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_GET_STATUS" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "USB Core APIs"
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.SH "NAME"
usb_get_status \- issues a GET_STATUS call
.SH "SYNOPSIS"
.HP \w'int\ usb_get_status('u
.BI "int usb_get_status(struct\ usb_device\ *\ " "dev" ", int\ " "type" ", int\ " "target" ", void\ *\ " "data" ");"
.SH "ARGUMENTS"
.PP
\fIdev\fR
.RS 4
the device whose status is being checked
.RE
.PP
\fItype\fR
.RS 4
USB_RECIP_*; for device, interface, or endpoint
.RE
.PP
\fItarget\fR
.RS 4
zero (for device), else interface or endpoint number
.RE
.PP
\fIdata\fR
.RS 4
pointer to two bytes of bitmap data
.RE
.SH "CONTEXT"
.PP
!in_interrupt ()
.SH "DESCRIPTION"
.PP
Returns device, interface, or endpoint status\&. Normally only of interest to see if the device is self powered, or has enabled the remote wakeup facility; or whether a bulk or interrupt endpoint is halted (\(lqstalled\(rq)\&.
.PP
Bits in these status bitmaps are set using the SET_FEATURE request, and cleared using the CLEAR_FEATURE request\&. The
\fBusb_clear_halt\fR
function should be used to clear halt (\(lqstall\(rq) status\&.
.PP
This call is synchronous, and may not be used in an interrupt context\&.
.PP
Returns 0 and the status value in *\fIdata\fR
(in host byte order) on success, or else the status code from the underlying
\fBusb_control_msg\fR
call\&.
.SH "COPYRIGHT"
.br