usb_unregister_hotplug_cbs(9f) [opensolaris man page]

usb_register_hotplug_cbs(9F)				   Kernel Functions for Drivers 			      usb_register_hotplug_cbs(9F)

NAME

       usb_register_hotplug_cbs, usb_unregister_hotplug_cbs - Register/unregister for notification of device hotplug events

SYNOPSIS

       #include <sys/usb/usba.h>

       int usb_register_hotplug_cbs(dev_info_t *dip,
	    int (*disconnection_event_handler)(dev_info_t *dip,
	    int (*reconnection_event_handler)(dev_info_t *dip);

	void usb_unregister_hotplug_cbs(dev_info_t *dip);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI)

PARAMETERS

       For usb_register_hotplug_cbs()

       dip

	   Pointer to the device's dev_info structure.

       disconnection_event_handler

	   Called  when  device  is  disconnected. This handler takes a dev_info_t as an argument (representing the device being disconnected) and
	   always returns USB_SUCCESS.

       reconnection_event_handler

	   Called when device is reconnected. This handler takes a dev_info_t as an argument  (representing  the  device  being  reconnected)  and
	   always returns USB_SUCCESS.

       For usb_unregister_hotplug_cbs():

       dip    Pointer to the device's dev_info structure.

DESCRIPTION

       The usb_register_hotplug_cbs() function registers callbacks to be executed when the USB device represented by dip is hotplugged or removed.

       The usb_unregister_hotplug_cbs() function unregisters or disengages callbacks from executing when the USB device represented by dip is hot-
       plugged or removed.

RETURN VALUES

       For usb_register_hotplug_cbs():

       USB_SUCCESS    Callbacks were successfully registered.

       USB_FAILURE    One or more arguments were NULL.

		      Callbacks could not be successfully registered.

       For usb_unregister_hotplug_cbs(): None

CONTEXT

       The usb_register_hotplug_cbs() function may be called only from attach(9E).

       The usb_unregister_hotplug_cbs() function may be called only from detach(9E).

       Registered callback handlers requiring the use of any DDI (section 9F) function (except ddi_taskq_* functions), should  launch  a  separate
       thread  using  ddi_taskq_* routines for processing their event, to avoid deadlocks. The new thread can then safely call any DDI function it
       needs to handle the event.

       The registered callback handlers execute in kernel context.

EXAMPLES

	     int remove_device(dev_info_t *)
	     {
		     ...
		     ...
		     return (USB_SUCCESS);
	     }

	     int accommodate_device(dev_info_t *)
	     {
		     ...
		     ...
		     return (USB_SUCCESS);
	     }

	     if (usb_register_hotplug_cbs(
		 dip, remove_device, accommodate_device) == USB_FAILURE) {
		     cmn_err (CE_WARN,
			 "%s%d: Could not register hotplug handlers.",
			 ddi_driver_name(dip), ddi_get_instance(dip));
	     }

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |PCI-based systems 	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWusb			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5), attach(9E), detach(9E), usb_get_status(9F)

SunOS 5.11							    17 Aug 2004 				      usb_register_hotplug_cbs(9F)