Hotplug event notification

---

This API is used to register callbacks to be called when devices are connected or disconnected.

Overview

Functions described here can be used to register callbacks to be called on events such as device connection or disconnection.

Functions
int	usb_host_set_hotplug_cb (usb_host_context_h ctx, usb_host_hotplug_cb cb, usb_host_hotplug_event_e event, void *user_data, usb_host_hotplug_h *handle)
	Sets a callback function to be invoked when a device is connected or disconnected.
int	usb_host_unset_hotplug_cb (usb_host_hotplug_h handle)
	Unsets the hotplug callback function.
Typedefs
typedef struct usb_host_hotplug_s *	usb_host_hotplug_h
	USB hotplug callback handle.
typedef void(*	usb_host_hotplug_cb )(usb_host_device_h dev, void *user_data)
	Device connected/disconnected event handler.

---

Typedef Documentation

typedef void(* usb_host_hotplug_cb)(usb_host_device_h dev, void *user_data)

Device connected/disconnected event handler.

The device handle should be unreffed with usb_host_unref_device() when no longer needed.

Since :

4.0

Parameters:

[in]	dev	Device which was connected/disconnected
[in]	user_data	User data pointer passed on callback registration

typedef struct usb_host_hotplug_s* usb_host_hotplug_h

USB hotplug callback handle.

This handle is used for managing registered hotplug callbacks.

Since :

4.0

---

Enumeration Type Documentation

enum usb_host_hotplug_event_e

Enumeration of hotplug event types.

Since :

4.0

Enumerator:

USB_HOST_HOTPLUG_EVENT_ATTACH	Device was connected
USB_HOST_HOTPLUG_EVENT_DETACH	Device was disconnected
USB_HOST_HOTPLUG_EVENT_ANY	Any event

---

Function Documentation

int usb_host_set_hotplug_cb	(	usb_host_context_h	ctx,
		usb_host_hotplug_cb	cb,
		usb_host_hotplug_event_e	event,
		void *	user_data,
		usb_host_hotplug_h *	handle
	)

Sets a callback function to be invoked when a device is connected or disconnected.

Since :

4.0

Parameters:

[in]	ctx	Context handle
[in]	cb	The callback function to be registered
[in]	event	Event that will trigger registered callback
[in]	user_data	The user data to be passed to the callback function
[out]	handle	Handle of the registered callback

Returns:

0 on success, negative error code on error

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_NOT_SUPPORTED	Not supported
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed
USB_HOST_ERROR_OUT_OF_MEMORY	Out of memory

int usb_host_unset_hotplug_cb

(

usb_host_hotplug_h

handle

)

Unsets the hotplug callback function.

Since :

4.0

Parameters:

[in]

handle

Handle of the callback to be unregistered

Returns:

0 on success, negative error code on error

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed
USB_HOST_ERROR_NOT_SUPPORTED	Not supported