usb_clr_feature(9F) Kernel Functions for Drivers usb_clr_feature(9F)NAMEusb_clr_feature - Clear feature of USB device, interface or endpoint
SYNOPSIS
#include <sys/usb/usba.h>
int usb_clr_feature(dev_info_t *dip, uint_t request_type, uint_t fea‐
ture, uint_t which, usb_flags_t flags, void (*callback) (usb_pipe_han‐
dle_t pipe_handle, usb_opaque_t callback_arg, int rval, usb_cb_flags_t
flags), usb_opaque_t callback_arg);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
PARAMETERS
dip
Pointer to the device's dev_info structure.
pipe_handle
Pipe handle to device, device interface or endpoint.
request_type
bmRequestType to be used. One of the following:
USB_DEV_REQ_RCPT_DEV - Clear feature on device.
USB_DEV_REQ_RCPT_IF - Clear feature on interface.
USB_DEV_REQ_RCPT_EP - Clear feature on endpoint.
feature
Feature to be cleared. Can be any device-defined device-, inter‐
face-, or endpoint-specific feature, including the following which
are defined in the USB 2.0 specification:
USB_EP_HALT - Clear a HALT on an endpoint.
USB_DEV_REMOTE_WAKEUP - Clear REMOTE_WAKEUP on a device.
USB_DEV_TEST_MODE - Clear TEST_MODE on a device.
which
Device, interface or endpoint on which to clear the feature. One
of:
Interface number, for interfaces.
Endpoint number, for endpoints.
0 for devices.
flags
USB_FLAGS_SLEEP is the only flag recognized. Wait for completion and do
not call callback.
callback
Callback handler to notify of asynchronous completion.
callback_arg
Second argument passed to callback handler.
DESCRIPTION
The usb_clr_feature() function clears a specific feature of a device,
interface or endpoint. This function always blocks and waits for
resources if not available, regardless of the flags argument.
This call blocks for completion if USB_FLAGS_SLEEP is set in flags. It
returns immediately and calls the callback upon completion if
USB_FLAGS_SLEEP is not set.
RETURN VALUES
USB_SUCCESS Feature was successfully cleared.
USB_INVALID_ARGS dip argument is NULL.
USB_INVALID_PIPE pipe_handle argument is NULL
USB_INVALID_CONTEXT Called from interrupt context with
USB_FLAGS_SLEEP flag set.
USB_FAILURE Clearing of feature was unsuccessful.
CONTEXT
May always be called from user or kernel context. May be called from
interrupt context only if USB_FLAGS_SLEEP is not set in flags.
If the USB_CB_ASYNC_REQ_FAILED bit is clear in usb_cb_flags_t, the
callback, if supplied, can block because it is executing in kernel
context. Otherwise the callback cannot block. Please see usb_call‐
back_flags(9S) for more information on callbacks.
EXAMPLES
if (usb_clr_feature(dip, pipe_handle, USB_DEV_REQ_RCPT_EP,
USB_EP_HALT, data_endpoint_num, 0) == USB_FAILURE) {
cmn_err (CE_WARN,
"%s%d: Error clearing halt condition on data endpoint %d.",
ddi_driver_name(dip), ddi_get_instance(dip),
data_endpoint_num);
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Architecture │PCI-based systems │
├─────────────────────────────┼─────────────────────────────┤
│Interface stability │Evolving │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWusb │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOattributes(5), usb_get_status(9F), usb_pipe_reset(9F),
usb_pipe_get_state(9F), usb_callback_flags(9S)SunOS 5.10 Feb 9 2004 usb_clr_feature(9F)
