xref: /illumos-gate/usr/src/man/man9f/usb_get_status.9f (revision ddb365bfc9e868ad24ccdcb0dc91af18b10df082) 
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 Copyright (c) 2004, Sun Microsystems, Inc., All Rights Reserved
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 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_GET_STATUS 9F "Jan 5, 2004"
 NAME
usb_get_status - Get status of a USB device/endpoint/interface

 SYNOPSIS
#include <sys/usb/usba.h>



int usb_get_status(dev_info_t *dip, usb_pipe_handle_t pipe_handle,
 uint_t request_type, uint_t which, uint16_t *status,
 usb_flags_t flags);




 INTERFACE LEVEL
illumos DDI specific (illumos DDI)

 PARAMETERS
dip


Pointer to device's dev_info structure.



pipe_handle


Default control pipe handle on which request is made.



request_type


bmRequestType. Either:
USB_DEV_REQ_RCPT_DEV \(em Get device status.
USB_DEV_REQ_RCPT_IF \(em Get interface status.
USB_DEV_REQ_RCPT_EP \(em Get endpoint status.



which


Device, interface or endpoint from which to get status. Either number of
interface or endpoint, or 0 if device status requested.



status


Address into which the status is written.



flags


None are recognized.




 DESCRIPTION
The usb_get_status() function returns the status of a device, interface
or endpoint. All status requests use the default control pipe. Length of data
returned is USB_GET_STATUS_LEN bytes. Always block and wait for resources if
not available, regardless of the flags argument.


When the request_type recipient is USB_DEV_REQ_RCPT_DEV, device status is
requested. Status returned includes bits for USB_DEV_SLF_PWRD_STATUS (device is
currently self-powered) and USB_DEV_RWAKEUP_STATUS (device has remote wakeup
enabled). A set bit indicates the corresponding status.


When the request_type is USB_DEV_REQ_RCPT_EP, endpoint status is
requested. Status returned includes bits for USB_EP_HALT_STATUS (endpoint is
halted). A set bit indicates the corresponding status.


When the request_type is USB_DEV_REQ_RCPT_IF, interface status is
requested and USB_IF_STATUS (zero) is returned.

 RETURN VALUES
USB_SUCCESS


Status returned successfully in the status argument.



USB_INVALID_ARGS


Status pointer and/or dip argument is NULL.



USB_INVALID_PIPE


Pipe handle is NULL.



USB_FAILURE


Status not returned successfully.




 CONTEXT
May be called from user or kernel context.

 EXAMPLES
 uint16_t status;

 if (usb_get_status(
 dip, pipe_handle, USB_DEV_REQ_RCPT_DEV, 0 &status, 0) ==
 USB_SUCCESS) {
 if (status & USB_DEV_SLF_PWRD_STATUS) {
 cmn_err (CE_WARN,
 "%s%d: USB device is running on its own power.",
 ddi_driver_name(dip), ddi_get_instance(dip));
 }
 }




 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_clr_feature(9F), usb_get_alt_if(9F),
usb_pipe_get_state(9F), usb_get_cfg(9F),