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 — 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 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