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 2006, QNX Software Systems GmbH & Co. KG. usbd attach()

Attach to a USB device

Synopsis:

#include <sys/usbdi.h>

int usbd

attach( struct usbd connection *connection,

usbd

device instance t*instance,

size

t extra,

struct usbd

device **device );

Description:

You use the usbd attach() function to attach to a USB device.

Typically, you do this out of the insertion callback (made when the

device matched your ﬁlter), which will give you the connection and

instance parameters involved. The insertion callback is prototyped as

follows:

void (*insertion)(struct usbd connection *, usbd device instance t *instance)

Here are the parameters:

connection An opaque handle that identiﬁes the USB stack (from

usbd

connect()).

instance Describes which device you wish to attach to.

extra The size of additional memory you’d like allocated

with the device. You can use usbd

device extra() later

to get a pointer to this additional memory. Typically,

the class driver would store various

status/conﬁg/device-speciﬁc details in here (if

needed).

device An opaque handle used to identify the device in later

calls.

The

usbd device instance t structure looks like this:

November 2, 2006 Chapter 4 USB Library Reference 29

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Belkin F8E211 Guía de usuario Pagina 41