USB host controller driver API

USB host controller (UHC) driver API. More...

Data Structures
struct	uhc_transfer
struct	uhc_event
struct	uhc_device_caps
struct	uhc_data

Macros
#define	UHC_STATUS_INITIALIZED   0
#define	UHC_STATUS_ENABLED   1

Typedefs
typedef int(*	uhc_event_cb_t) (const struct device *dev, const struct uhc_event *const event)
	Callback to submit UHC event to higher layer.

Enumerations
enum	uhc_event_type {   UHC_EVT_DEV_CONNECTED_LS , UHC_EVT_DEV_CONNECTED_FS , UHC_EVT_DEV_CONNECTED_HS , UHC_EVT_DEV_REMOVED ,   UHC_EVT_RESETED , UHC_EVT_SUSPENDED , UHC_EVT_RESUMED , UHC_EVT_RWUP ,   UHC_EVT_EP_REQUEST , UHC_EVT_ERROR }
	USB host controller event types. More...

Functions
static bool	uhc_is_initialized (const struct device *dev)
	Checks whether the controller is initialized.
static bool	uhc_is_enabled (const struct device *dev)
	Checks whether the controller is enabled.
static int	uhc_bus_reset (const struct device *dev)
	Reset USB bus.
static int	uhc_sof_enable (const struct device *dev)
	Enable Start of Frame generator.
static int	uhc_bus_suspend (const struct device *dev)
	Suspend USB bus.
static int	uhc_bus_resume (const struct device *dev)
	Resume USB bus.
struct uhc_transfer *	uhc_xfer_alloc (const struct device *dev, const uint8_t addr, const uint8_t ep, const uint8_t attrib, const uint16_t mps, const uint16_t timeout, void *const owner)
	Allocate UHC transfer.
int	uhc_xfer_free (const struct device *dev, struct uhc_transfer *const xfer)
	Free UHC transfer and any buffers.
struct net_buf *	uhc_xfer_buf_alloc (const struct device *dev, struct uhc_transfer *const xfer, const size_t size)
	Allocate UHC transfer buffer.
int	uhc_xfer_buf_free (const struct device *dev, struct net_buf *const buf)
	Free UHC request buffer.
int	uhc_ep_enqueue (const struct device *dev, struct uhc_transfer *const xfer)
	Queue USB host controller transfer.
int	uhc_ep_dequeue (const struct device *dev, struct uhc_transfer *const xfer)
	Remove a USB host controller transfers from queue.
int	uhc_init (const struct device *dev, uhc_event_cb_t event_cb)
	Initialize USB host controller.
int	uhc_enable (const struct device *dev)
	Enable USB host controller.
int	uhc_disable (const struct device *dev)
	Disable USB host controller.
int	uhc_shutdown (const struct device *dev)
	Poweroff USB host controller.
static struct uhc_device_caps	uhc_caps (const struct device *dev)
	Get USB host controller capabilities.

Detailed Description

USB host controller (UHC) driver API.

Macro Definition Documentation

UHC_STATUS_ENABLED

#define UHC_STATUS_ENABLED   1

#include <zephyr/drivers/usb/uhc.h>

Controller is enabled and all API functions are available

UHC_STATUS_INITIALIZED

#define UHC_STATUS_INITIALIZED   0

#include <zephyr/drivers/usb/uhc.h>

Controller is initialized by uhc_init()

Typedef Documentation

uhc_event_cb_t

uhc_event_cb_t

#include <zephyr/drivers/usb/uhc.h>

Callback to submit UHC event to higher layer.

At the higher level, the event is to be inserted into a message queue.

Parameters

[in]	dev	Pointer to device struct of the driver instance
[in]	event	Point to event structure

Returns

0 on success, all other values should be treated as error.

Enumeration Type Documentation

uhc_event_type

enum uhc_event_type

#include <zephyr/drivers/usb/uhc.h>

USB host controller event types.

Enumerator
UHC_EVT_DEV_CONNECTED_LS	Low speed device connected
UHC_EVT_DEV_CONNECTED_FS	Full speed device connected
UHC_EVT_DEV_CONNECTED_HS	High speed device connected
UHC_EVT_DEV_REMOVED	Device (peripheral) removed
UHC_EVT_RESETED	Bus reset operation finished
UHC_EVT_SUSPENDED	Bus suspend operation finished
UHC_EVT_RESUMED	Bus resume operation finished
UHC_EVT_RWUP	Remote wakeup signal
UHC_EVT_EP_REQUEST	Endpoint request result event
UHC_EVT_ERROR	Non-correctable error event, requires attention from higher levels or application.

Function Documentation

uhc_bus_reset()

static int uhc_bus_reset ( const struct device *  dev )

inlinestatic

#include <zephyr/drivers/usb/uhc.h>

Reset USB bus.

Perform USB bus reset, controller may emit UHC_EVT_RESETED at the end of reset signaling.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

0 on success, all other values should be treated as error.

Return values

-EBUSY

if the controller is already performing a bus operation

uhc_bus_resume()

static int uhc_bus_resume ( const struct device *  dev )

inlinestatic

#include <zephyr/drivers/usb/uhc.h>

Resume USB bus.

Signal resume for at least 20ms, emit UHC_EVT_RESUMED at the end of USB bus resume signaling. The SoF generator should subsequently start within 3ms.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

0 on success, all other values should be treated as error.

Return values

-EBUSY

if the controller is already performing a bus operation

uhc_bus_suspend()

static int uhc_bus_suspend ( const struct device *  dev )

inlinestatic

#include <zephyr/drivers/usb/uhc.h>

Suspend USB bus.

Disable SOF generator and emit UHC_EVT_SUSPENDED event when USB bus is suspended.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

0 on success, all other values should be treated as error.

Return values

-EALREADY

if already suspended

uhc_caps()

static struct uhc_device_caps uhc_caps ( const struct device *  dev )

inlinestatic

#include <zephyr/drivers/usb/uhc.h>

Get USB host controller capabilities.

Obtain the capabilities of the controller such as high speed (HS), and more.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

USB host controller capabilities.

uhc_disable()

int uhc_disable

(

const struct device *

dev

)

#include <zephyr/drivers/usb/uhc.h>

Disable USB host controller.

Disable enabled USB host controller.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

0 on success, all other values should be treated as error.

Return values

-EALREADY

already disabled

uhc_enable()

int uhc_enable

(

const struct device *

dev

)

#include <zephyr/drivers/usb/uhc.h>

Enable USB host controller.

Enable powered USB host controller and allow host stack to recognize and enumerate devices.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

0 on success, all other values should be treated as error.

Return values

-EPERM	controller is not initialized
-EALREADY	already enabled

uhc_ep_dequeue()

int uhc_ep_dequeue	(	const struct device *	dev,
		struct uhc_transfer *const	xfer
	)

#include <zephyr/drivers/usb/uhc.h>

Remove a USB host controller transfers from queue.

Not implemented yet.

Parameters

[in]	dev	Pointer to device struct of the driver instance
[in]	xfer	Pointer to UHC transfer

Returns

0 on success, all other values should be treated as error.

Return values

-EPERM

controller is not initialized

uhc_ep_enqueue()

int uhc_ep_enqueue	(	const struct device *	dev,
		struct uhc_transfer *const	xfer
	)

#include <zephyr/drivers/usb/uhc.h>

Queue USB host controller transfer.

Add transfer to the queue. If the queue is empty, the transfer can be claimed by the controller immediately.

Parameters

[in]	dev	Pointer to device struct of the driver instance
[in]	xfer	Pointer to UHC transfer

Returns

0 on success, all other values should be treated as error.

Return values

-EPERM

controller is not initialized

uhc_init()

int uhc_init	(	const struct device *	dev,
		uhc_event_cb_t	event_cb
	)

#include <zephyr/drivers/usb/uhc.h>

Initialize USB host controller.

Initialize USB host controller.

Parameters

[in]	dev	Pointer to device struct of the driver instance
[in]	event_cb	Event callback from the higher layer (USB host stack)

Returns

0 on success, all other values should be treated as error.

Return values

-EINVAL	on parameter error (no callback is passed)
-EALREADY	already initialized

uhc_is_enabled()

static bool uhc_is_enabled ( const struct device *  dev )

inlinestatic

#include <zephyr/drivers/usb/uhc.h>

Checks whether the controller is enabled.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

true if controller is enabled, false otherwise

uhc_is_initialized()

static bool uhc_is_initialized ( const struct device *  dev )

inlinestatic

#include <zephyr/drivers/usb/uhc.h>

Checks whether the controller is initialized.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

true if controller is initialized, false otherwise

uhc_shutdown()

int uhc_shutdown

(

const struct device *

dev

)

#include <zephyr/drivers/usb/uhc.h>

Poweroff USB host controller.

Shut down the controller completely to reduce energy consumption or to change the role of the controller.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

0 on success, all other values should be treated as error.

Return values

-EALREADY

controller is already uninitialized

uhc_sof_enable()

static int uhc_sof_enable ( const struct device *  dev )

inlinestatic

#include <zephyr/drivers/usb/uhc.h>

Enable Start of Frame generator.

Enable SOF generator.

Parameters

[in]

dev

Pointer to device struct of the driver instance

Returns

0 on success, all other values should be treated as error.

Return values

-EALREADY

if already enabled

uhc_xfer_alloc()

struct uhc_transfer * uhc_xfer_alloc	(	const struct device *	dev,
		const uint8_t	addr,
		const uint8_t	ep,
		const uint8_t	attrib,
		const uint16_t	mps,
		const uint16_t	timeout,
		void *const	owner
	)

#include <zephyr/drivers/usb/uhc.h>

Allocate UHC transfer.

Allocate a new transfer from common transfer pool. Transfer has no buffers after allocation, these can be requested and assigned separately.

Parameters

[in]	dev	Pointer to device struct of the driver instance
[in]	addr	Device (peripheral) address
[in]	ep	Endpoint address
[in]	attrib	Endpoint attributes
[in]	mps	Maximum packet size of the endpoint
[in]	timeout	Timeout in number of frames
[in]	owner	Transfer owner

Returns

pointer to allocated transfer or NULL on error.

uhc_xfer_buf_alloc()

struct net_buf * uhc_xfer_buf_alloc	(	const struct device *	dev,
		struct uhc_transfer *const	xfer,
		const size_t	size
	)

#include <zephyr/drivers/usb/uhc.h>

Allocate UHC transfer buffer.

Allocate a new buffer from common request buffer pool and assign it to the transfer.

Parameters

[in]	dev	Pointer to device struct of the driver instance
[in]	xfer	Pointer to UHC transfer
[in]	size	Size of the request buffer

Returns

pointer to allocated request or NULL on error.

uhc_xfer_buf_free()

int uhc_xfer_buf_free	(	const struct device *	dev,
		struct net_buf *const	buf
	)

#include <zephyr/drivers/usb/uhc.h>

Free UHC request buffer.

Put the buffer back into the request buffer pool.

Parameters

[in]	dev	Pointer to device struct of the driver instance
[in]	buf	Pointer to UHC request buffer

Returns

0 on success, all other values should be treated as error.

uhc_xfer_free()

int uhc_xfer_free	(	const struct device *	dev,
		struct uhc_transfer *const	xfer
	)

#include <zephyr/drivers/usb/uhc.h>

Free UHC transfer and any buffers.

Free any buffers and put the transfer back into the transfer pool.

Parameters

[in]	dev	Pointer to device struct of the driver instance
[in]	xfer	Pointer to UHC transfer

Returns

0 on success, all other values should be treated as error.