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connect()

ident A pointer to a usbd_device_ident_t structure that identiﬁes

the devices you’re interested in receiving insertion/removal

callbacks for (a ﬁlter):

typedef struct usbd_device_ident {

_uint32 vendor;

_uint32 device;

_uint32 dclass;

_uint32 subclass;

_uint32 protocol;

} usbd_device_ident_t;

You can set the ﬁelds to USBD_CONNECT_ WILDCARD or to an

explicit value. You would typically make the

usbd_device_ident_t structure be a ﬁlter for devices you

support from this speciﬁc class driver.

funcs A pointer to a

usbd_funcs_t structure that speciﬁes the

insertion/removal callbacks:

typedef struct usbd_funcs {

_uint32 nentries;

void (*insertion)(struct usbd_connection *, usbd_device_instance_t *instance);

void (*removal)(struct usbd_connection *, usbd_device_instance_t *instance);

void (*event)(struct usbd_connection *, usbd_device_instance_t *instance,

_uint16 type);

} usbd_funcs_t;

The usbd_funcs_t structure includes the following members:

nentries The number of entries in the structure. Set this to

_USBDI_NFUNCS.

insertion The function to call when a device that matches the

deﬁned ﬁlter is detected.

removal The function to call when a device is removed.

event A future extension for various other event notiﬁcations

(e.g. bandwidth problems).

By passing NULL as the usbd

funcs, you’re saying that you’re not interested in

receiving dynamic insertion/removal notiﬁcations, which means that you won’t be a

fully operational class driver. No asynchronous I/O will be allowed, no event thread,

etc. This approach is taken, for example, by the

usb display utility.

connect

wait A value (in seconds) or USBD_CONNECT_WAIT.

Returns:

EOK Success.

EPROGMISMATCH

Versionitis.

ENOMEM No memory for internal connect structures.

September 10, 2007 Chapter 4 • USB Library Reference 29

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