hidd_funcs_t

HID event callback functions

Synopsis:

#include <sys/hiddi.h>

typedef struct hidd_funcs {
	_Uint32t nentries;

	void (*insertion) (struct hidd_connection *connection,
	                   hidd_device_instance_t *instance);

	void (*removal)   (struct hidd_connection *connection,
	                   hidd_device_instance_t *instance);

	void (*report)    (struct hidd_connection *connection,
	                   struct hidd_report *handle,
	                   void *report_data,
	                   _Uint32t report_len,
	                   _Uint32t flags,
	                   void *user);

	void (*event)     (struct hidd_connection *connection,
	                   hidd_device_instance_t *instance,
	                   _Uint16t type);

} hidd_funcs_t;

Description:

Contains the pointers to the HID event callback functions implementation.

The members include:

nentries

The number of functions in the structure. Set to _HIDDI_NFUNCS.

insertion

Called when a device matching defined filter is detected.

void myhidd_insertion( struct hidd_connection *connection,
	                   hidd_device_instance_t *instance );

connection: The HID server connection handle.
instance: The HID device instance handle.

removal

Called when a device is removed.

void myhidd_removal( struct hidd_connection *connection,
	                 hidd_device_instance_t *instance );

connection: The HID server connection handle.
instance: The HID device instance handle.

report

Called when a device sends an input report you have registered for.

void myhidd_report( struct hidd_connection *connection,
	                struct hidd_report *handle,
	                void *report_data,
	                _Uint32t report_len,
	                _Uint32t flags,
	                void *user );

connection: The HID server connection handle.
handle: The report handle.
report_data: Pointer to the buffer containing raw report data.
report_len: Length of the report data in bytes.
flags: Report flags.
user: Pointer to the extra data allocated by hidd_report_attach().

event

A future extension for various other event notifications.

void event( struct hidd_connection *connection,
	        hidd_device_instance_t *instance,
	        _Uint16t type );

connection: The HID server connection handle.
instance: The HID device instance handle.
type: The HID event type.

Page updated: January 29, 2026