usb_register_hotplug_cbs(Kernel Functions for Drivusb_register_hotplug_cbs(9F)NAME
usb_register_hotplug_cbs, usb_unregister_hotplug_cbs - Register/unreg‐
ister for notification of device hotplug events
SYNOPSIS
#include <sys/usb/usba.h>
int usb_register_hotplug_cbs(dev_info_t *dip, int (*disconnec‐
tion_event_handler)(dev_info_t *dip, int (*reconnection_event_han‐
dler)(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 exe‐
cuted 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 │Evolving │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWusb │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOattributes(5), attach(9E), detach(9E), usb_get_status(9F)SunOS 5.10 17 Aug 2004 usb_register_hotplug_cbs(9F)
