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usb_clear_halt(9) [centos man page]

USB_CLEAR_HALT(9)						   USB Core APIs						 USB_CLEAR_HALT(9)

NAME
usb_clear_halt - tells device to clear endpoint halt/stall condition SYNOPSIS
int usb_clear_halt(struct usb_device * dev, int pipe); ARGUMENTS
dev device whose endpoint is halted pipe endpoint "pipe" 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 "stalled". 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 "protocol stall" (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. RETURN
Zero on success, or else the status code returned by the underlying usb_control_msg call. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_CLEAR_HALT(9)

Check Out this Related Man Page

USB_SET_INTERFACE(9)						   USB Core APIs					      USB_SET_INTERFACE(9)

NAME
usb_set_interface - Makes a particular alternate setting be current SYNOPSIS
int usb_set_interface(struct usb_device * dev, int interface, int alternate); ARGUMENTS
dev the device whose interface is being updated interface the interface being updated alternate the setting being chosen. CONTEXT
!in_interrupt () DESCRIPTION
This is used to enable data transfers on interfaces that may not be enabled by default. Not all devices support such configurability. Only the driver bound to an interface may change its setting. Within any given configuration, each interface may have several alternative settings. These are often used to control levels of bandwidth consumption. For example, the default setting for a high speed interrupt endpoint may not send more than 64 bytes per microframe, while interrupt transfers of up to 3KBytes per microframe are legal. Also, isochronous endpoints may never be part of an interface's default setting. To access such bandwidth, alternate interface settings must be made current. Note that in the Linux USB subsystem, bandwidth associated with an endpoint in a given alternate setting is not reserved until an URB is submitted that needs that bandwidth. Some other operating systems allocate bandwidth early, when a configuration is chosen. This call is synchronous, and may not be used in an interrupt context. Also, drivers must not change altsettings while urbs are scheduled for endpoints in that interface; all such urbs must first be completed (perhaps forced by unlinking). RETURN
Zero on success, or else the status code returned by the underlying usb_control_msg call. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_SET_INTERFACE(9)

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