Belkin F8E211 Guia do Utilizador descarregar pdf (Página 64)

usbd

hub

Get the hub descriptor for a speciﬁc (hub) device

Synopsis:

#include <sys/usbdi.h>

usbd_hub_descriptor_t *usbd_hub_descriptor(

struct usbd_device *device,

struct usbd_desc_node **node );

Arguments:

device An opaque handle used to identify the USB device.

node Indicates the descriptor’s location for rooting future requests.

Library:

libusbdi

Description:

The usbd

hub

descriptor() function lets you obtain a hub descriptor.

The

usbd_hub_descriptor_t data structure looks like this:

typedef struct usbd_hub_descriptor {

_uint8 bLength;

_uint8 bDescriptorType;

_uint8 bNbrPorts;

_uint16 wHubCharacteristics;

_uint8 bPwrOn2PwrGood;

_uint8 bHubContrCurrent;

_uint8 DeviceRemovable[1];

_uint8 PortPwrCtrlMask[1];

} usbd_hub_descriptor_t;

Returns:

A pointer to usbd_hub_descriptor_t on success, or NULL on error.

Classiﬁcation:

QNX Neutrino, QNX 4

Safety

Cancellation point No

Interrupt handler No

Signal handler No

Thread Yes

50 Chapter 4 • USB Library Reference September 10, 2007

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Belkin F8E211 Guia do Utilizador Página 64