Rechercher une page de manuel
usb_clear_halt
Langue: en
Version: October 2010 (fedora - 01/12/10)
Section: 9 (Appels noyau Linux)
NAME
usb_clear_halt - tells device to clear endpoint halt/stall conditionSYNOPSIS
- int usb_clear_halt(struct usb_device * dev, int pipe);
ARGUMENTS
dev
- device whose endpoint is halted
pipe
- endpoint lqpiperq being cleared
CONTEXT
!in_interrupt ()
DESCRIPTION
This is used to clear halt conditions for bulk and interrupt endpoints, as reported by URB completion status. Endpoints that are halted are sometimes referred to as being lqstalledrq. Such endpoints are unable to transmit or receive data until the halt status is cleared. Any URBs queued for such an endpoint should normally be unlinked by the driver before clearing the halt condition, as described in sections 5.7.5 and 5.8.5 of the USB 2.0 spec.
Note that control and isochronous endpoints don't halt, although control endpoints report lqprotocol stallrq (for unsupported requests) using the same status code used to report a true stall.
This call is synchronous, and may not be used in an interrupt context.
Returns zero on success, or else the status code returned by the underlying usb_control_msg call.
COPYRIGHT
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre