man/man9f/usb_lookup_ep_data.9f

         te
 Copyright (c) 2004, Sun Microsystems, Inc., All Rights Reserved
 The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
 You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
 When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
 USB_LOOKUP_EP_DATA 9F "Sep 16, 2016"
 NAME
usb_lookup_ep_data - Lookup endpoint information
 SYNOPSIS
#include <sys/usb/usba.h>


usb_ep_data_t *usb_lookup_ep_data(dev_info_t *dip,
 usb_client_dev_data_t *dev_datap, uint_t interface,
 uint_t alternate, uint_t skip, uint_t type, uint_t direction);


 INTERFACE LEVEL
illumos DDI specific (illumos DDI)
 PARAMETERS
dip

Pointer to the device's dev_info structure.


dev_datap

Pointer to a usb_client_dev_data_t structure containing tree.


interface

Number of interface in which endpoint resides.


alternate

Number of interface alternate setting in which endpoint resides.


skip

Number of endpoints which match the requested type and direction to skip before
finding one to retrieve.


type

Type of endpoint. This is one of: USB_EP_ATTR_CONTROL, USB_EP_ATTR_ISOCH,
USB_EP_ATTR_BULK, or USB_EP_ATTR_INTR. Please see usb_pipe_xopen(9F) for
more information.


direction

Direction of endpoint, either USB_EP_DIR_OUT or USB_EP_DIR_IN. This argument is
ignored for bi-directional control endpoints.


 DESCRIPTION
The usb_lookup_ep_data() function returns endpoint information from the
tree embedded in client data returned from usb_get_dev_data. It operates
on the current configuration (pointed to by the dev_curr_cfg field of the
usb_client_dev_data_t argument). It skips the first <skip> number of
endpoints it finds which match the specifications of the other arguments, and
then retrieves information on the next matching endpoint it finds. Note that it
does not make a copy of the data, but points to the tree itself.
 RETURN VALUES
On success: the tree node corresponding to the desired endpoint.

On failure: returns NULL. Fails if dip or dev_datap are NULL, if
the desired endpoint does not exist in the tree, or no tree is present in
dev_datap.
 CONTEXT
May be called from user, kernel or interrupt context.
 EXAMPLES
Retrieve the polling interval for the second interrupt endpoint at interface 0,
alt 3:
 uint8_t interval = 0;
 usb_ep_data_t *ep_node = usb_lookup_ep_data(
 dip, dev_datap, 0, 3, 1, USB_EP_ATTR_INTR, USB_EP_DIR_IN);
 if (ep_node != NULL) {
 interval = ep_node->ep_descr.bInterval;
 }


Retrieve the maximum packet size for the first control pipe at interface 0, alt
4:
 uint16_t maxPacketSize = 0;
 usb_ep_data_t *ep_node = usb_lookup_ep_data(
 dip, dev_datap, 0, 4, 0, USB_EP_ATTR_CONTROL, 0);
 if (ep_node != NULL) {
 maxPacketSize = ep_node->ep_descr.wMaxPacketSize;
 }


 ATTRIBUTES
See attributes(7) for descriptions of the following attributes:


ATTRIBUTE TYPE ATTRIBUTE VALUE
Architecture PCI-based systems
Interface stability Committed


 SEE ALSO
 attributes (7),  usb_get_dev_data (9F),  usb_pipe_open (9F),  usb_cfg_descr (9S),  usb_ep_descr (9S),  usb_if_descr (9S)