This API is used to handle tasks related to USB interfaces.

This API is used to handle tasks related to USB interfaces

Overview

Data structures and operations described here are related to USB interface. Each interface has number of endpoints used for performing transfer operations.

Related Features

This API is related with the following features:

http://tizen.org/feature/usb.host

It is recommended to design feature related codes in your application for reliability.

You can check if a device supports the related features for this API by using System Information, thereby controlling the procedure of your application.

To ensure your application is only running on the device with specific features, please define the features in your manifest file using the manifest editor in the SDK.

More details on featuring your application can be found from Feature List.

Functions
int	usb_host_claim_interface (usb_host_interface_h interface, bool force)
	Claims a USB interface on a device for further I/O.
int	usb_host_release_interface (usb_host_interface_h interface)
	Releases a previously claimed interface on a device.
int	usb_host_interface_get_number (usb_host_interface_h interface, int *number)
	Gets the "number" of the given USB interface handle.
int	usb_host_interface_get_num_endpoints (usb_host_interface_h interface, int *num_endpoints)
	Gets the number of endpoints in given USB interface.
int	usb_host_interface_get_endpoint (usb_host_interface_h interface, int ep_index, usb_host_endpoint_h *ep)
	Gets an endpoint via index from given USB interface.
int	usb_host_interface_set_altsetting (usb_host_interface_h interface, int altsetting)
	Sets an alternative setting for given USB interface.
int	usb_host_interface_get_altsetting (usb_host_interface_h interface, int *altsetting)
	Gets current alternative setting from an interface.
int	usb_host_interface_get_str (usb_host_interface_h interface, int length, unsigned char data)
	Gets a string describing the given USB interface into a buffer.
Typedefs
typedef struct usb_host_interface_s *	usb_host_interface_h
	An opaque handle representing a USB configuration interface.

Typedef Documentation

typedef struct usb_host_interface_s* usb_host_interface_h

An opaque handle representing a USB configuration interface.

This type represents USB interface. An interface is a part of configuration and can have multiple endpoints. This handle can be obtained by usb_host_config_get_interface().

Since :: 3.0

Function Documentation

int usb_host_claim_interface	(	usb_host_interface_h	interface,
		bool	force
	)

Claims a USB interface on a device for further I/O.

Claims interface on a device. To perform I/O operations on interface user has to claim it. Remember to call usb_host_release_interface() when communication with the device is finished.

Since :: 3.0

Parameters:

[in]	interface	The bInterfaceNumber of interface to claim
[in]	force	Set to true to auto detach kernel driver, set to false to not detach it

Returns:: 0 on success, otherwise a negative error value

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_NOT_FOUND	Requested interface does not exist
USB_HOST_ERROR_RESOURCE_BUSY	Another program or driver has claimed the interface
USB_HOST_ERROR_NO_SUCH_DEVICE	Device has been disconnected
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed
USB_HOST_ERROR_DEVICE_NOT_OPENED	The device was not opened

int usb_host_interface_get_altsetting	(	usb_host_interface_h	interface,
		int *	altsetting
	)

Gets current alternative setting from an interface.

Since :: 4.0

Parameters:

[in]	interface	Interface handle
[out]	altsetting	Index of alternative setting set for the given interface

Returns:: 0 on success, otherwise a negative error value

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_NOT_SUPPORTED	Not supported
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed

int usb_host_interface_get_endpoint	(	usb_host_interface_h	interface,
		int	ep_index,
		usb_host_endpoint_h *	ep
	)

Gets an endpoint via index from given USB interface.

Since :: 3.0

Parameters:

[in]	interface	Interface handle
[in]	ep_index	index of endpoint to retrieve (counting from 0)
[out]	ep	Endpoint handle

Remarks:: ep handle is no longer valid when config will be destroyed. There is no need to destroy it, it is done automatically when the configuration is destroyed.

Returns:: 0 on success, otherwise a negative error value

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed

int usb_host_interface_get_num_endpoints	(	usb_host_interface_h	interface,
		int *	num_endpoints
	)

Gets the number of endpoints in given USB interface.

Since :: 3.0

Parameters:

[in]	interface	An interface
[out]	num_endpoints	Number of endpoints in interface

Returns:: 0 on success, otherwise a negative error value

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_NOT_SUPPORTED	Not supported
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed

int usb_host_interface_get_number	(	usb_host_interface_h	interface,
		int *	number
	)

Gets the "number" of the given USB interface handle.

Since :: 3.0

Parameters:

[in]	interface	An interface
[out]	number	Number of given interface

Returns:: 0 on success, otherwise a negative error value

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_NOT_SUPPORTED	Not supported
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed

int usb_host_interface_get_str	(	usb_host_interface_h	interface,
		int *	length,
		unsigned char *	data
	)

Gets a string describing the given USB interface into a buffer.

Since :: 3.0

Parameters:

[in]	interface	An interface
[in,out]	length	Data buffer size/how much was actually used
[out]	data	Buffer to store string

Returns:: 0 on success, otherwise a negative error value

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_NOT_SUPPORTED	Not supported
USB_HOST_ERROR_OVERFLOW	There was no space in buffer
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed

Precondition:: device which interface is part of must be opened by usb_host_device_open() or usb_host_device_open_with_vid_pid()

int usb_host_interface_set_altsetting	(	usb_host_interface_h	interface,
		int	altsetting
	)

Sets an alternative setting for given USB interface.

Since :: 3.0

Parameters:

[in]	interface	Interface handle
[in]	altsetting	Index of new alternative setting for given interface

Returns:: 0 on success, otherwise a negative error value

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed

int usb_host_release_interface ( usb_host_interface_h interface )

Releases a previously claimed interface on a device.

Releases interface previously claimed by usb_host_claim_interface(). This is a blocking function.

Since :: 3.0

Parameters:

[in] interface The bInterfaceNumber of interface to release

Returns:: 0 on success, otherwise a negative error value

Return values:

USB_HOST_ERROR_NONE	Successful
USB_HOST_ERROR_NOT_FOUND	Interface was not claimed
USB_HOST_ERROR_NO_SUCH_DEVICE	Device has been disconnected
USB_HOST_ERROR_INVALID_PARAMETER	Invalid parameter was passed
USB_HOST_ERROR_DEVICE_NOT_OPENED	The device was not opened
USB_HOST_ERROR_NOT_SUPPORTED	Not supported

Overview

Related Features

Functions

Typedefs

Typedef Documentation

Function Documentation