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 the number of bytes received on success, or else the status code returned by the underlying usb_control_msg call.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 USB_GET_STATUS(9)
