USB_REGISTER_HOTPLUG_CBS(9F) Kernel Functions for Drivers

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

illumos DDI specific (illumos 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
hotplugged 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(7) for descriptions of the following attributes:


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

SEE ALSO

attributes(7), attach(9E), detach(9E), usb_get_status(9F)

August 17, 2004 USB_REGISTER_HOTPLUG_CBS(9F)