1USB_EP_SET_HALT(9)          Kernel Mode Gadget API          USB_EP_SET_HALT(9)
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NAME

6       usb_ep_set_halt - sets the endpoint halt feature.
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SYNOPSIS

9       int usb_ep_set_halt(struct usb_ep * ep);
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ARGUMENTS

12       ep
13           the non-isochronous endpoint being stalled
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DESCRIPTION

16       Use this to stall an endpoint, perhaps as an error report. Except for
17       control endpoints, the endpoint stays halted (will not stream any data)
18       until the host clears this feature; drivers may need to empty the
19       endpoint´s request queue first, to make sure no inappropriate transfers
20       happen.
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22       Note that while an endpoint CLEAR_FEATURE will be invisible to the
23       gadget driver, a SET_INTERFACE will not be. To reset endpoints for the
24       current altsetting, see usb_ep_clear_halt. When switching altsettings,
25       it´s simplest to use usb_ep_enable or usb_ep_disable for the endpoints.
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27       Returns zero, or a negative error code. On success, this call sets
28       underlying hardware state that blocks data transfers. Attempts to halt
29       IN endpoints will fail (returning -EAGAIN) if any transfer requests are
30       still queued, or if the controller hardware (usually a FIFO) still
31       holds bytes that the host hasn´t collected.
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AUTHOR

34       David Brownell <dbrownell@users.sourceforge.net>
35           Author.
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38Kernel Hackers Manual 2.6.         June 2019                USB_EP_SET_HALT(9)
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