usb_reset_configuration — lightweight device reset
int usb_reset_configuration ( | struct usb_device * | dev); |
This issues a standard SET_CONFIGURATION request to the device using the current configuration. The effect is to reset most USB-related state in the device, including interface altsettings (reset to zero), endpoint halts (cleared), and data toggle (only for bulk and interrupt endpoints). Other usbcore state is unchanged, including bindings of usb device drivers to interfaces.
Because this affects multiple interfaces, avoid using this with composite
(multi-interface) devices. Instead, the driver for each interface may
use usb_set_interface on the interfaces it claims. Be careful though;
some devices don't support the SET_INTERFACE request, and others won't
reset all the interface state (notably data toggles). Resetting the whole
configuration would affect other drivers' interfaces.
The caller must own the device lock.
Returns zero on success, else a negative error code.