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 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)