usb_get_status(9) centos man page | unix.com

USB_GET_STATUS(9)						   USB Core APIs						 USB_GET_STATUS(9)

NAME
       usb_get_status - issues a GET_STATUS call

SYNOPSIS
       int usb_get_status(struct usb_device * dev, int type, int target, void * data);

ARGUMENTS
       dev
	   the device whose status is being checked

       type
	   USB_RECIP_*; for device, interface, or endpoint

       target
	   zero (for device), else interface or endpoint number

       data
	   pointer to two bytes of bitmap data

CONTEXT
       !in_interrupt ()

DESCRIPTION
       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 ("stalled").

       Bits in these status bitmaps are set using the SET_FEATURE request, and cleared using the CLEAR_FEATURE request. The usb_clear_halt
       function should be used to clear halt ("stall") status.

       This call is synchronous, and may not be used in an interrupt context.

       Returns 0 and the status value in *data (in host byte order) on success, or else the status code from the underlying usb_control_msg call.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							 USB_GET_STATUS(9)