Belkin F8E211 Uživatelská příručka stáhnout pdf (Strana 98)

usbd

topology(), usbd

topology

Get the USB bus physical topology

Synopsis:

#include <sys/usbdi.h>

int usbd_topology( struct usbd_connection *connection,

usbd_bus_topology_t *tp )

int usbd_topology_ext( struct usbd_connection *connection,

_uint8 busno,

usbd_bus_topology_t *tp )

Arguments:

connection An opaque handle that identiﬁes the USB stack, obtained by calling

usbd

connect().

bus (usbd

topology

ext() only) The index of the bus that you want the

topology for.

tp A pointer to a

usbd_bus_topology_t data structure that this

function ﬁlls in; see below.

Library:

libusbdi

Description:

You can use the usbd

topology() or usbd

topology

ext() function to get the USB bus

physical topology.

For more information on USB bus topology, see sections 4.1.1 and 5.2.3 in the USB

Speciﬁcation v1.1.

If your system has more than one bus, you can call usbd

topology

ext() to get

information about a speciﬁc one. The usbd

topology() function gets information about

the ﬁrst bus; calling it is the same as calling usbd

topology() with a bus argument of 0.

The

usbd_bus_topology_t structure is deﬁned as follows:

typedef struct usbd_port_attachment {

_uint8 upstream

devno;

_uint8 upstream

port;

_uint8 upstream

port

speed;

_uint8 upstream

hc;

_uint8

reserved[4];

} usbd_port_attachment_t;

typedef struct usbd_bus_topology {

usbd_port_attachment_t ports[64];

} usbd_bus_topology_t;

84 Chapter 4 • USB Library Reference September 10, 2007

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