usb_get_status(9F)					   Kernel Functions for Drivers 					usb_get_status(9F)

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

       Solaris DDI specific (Solaris 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 -- Get device status.

		       USB_DEV_REQ_RCPT_IF -- Get interface status.

		       USB_DEV_REQ_RCPT_EP -- 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 argu-
       ment.

       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(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |PCI-based systems 	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWusb			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5), usb_clr_feature(9F), usb_get_alt_if(9F), usb_pipe_get_state(9F), usb_get_cfg(9F),

SunOS 5.11							    5 Jan 2004							usb_get_status(9F)