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#include <sys/usb/usba.h> int usb_clr_feature(dev_info_t *dip, uint_t request_type, uint_t feature, uint_t which, usb_flags_t flags, void (*callback) (usb_pipe_handle_t pipe_handle, usb_opaque_t callback_arg, int rval, usb_cb_flags_t flags), usb_opaque_t callback_arg);
Pointer to the device's dev_info structure.
Pipe handle to device, device interface or endpoint.
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 to be cleared. Can be any device-defined device-, interface-, 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.
Device, interface or endpoint on which to clear the feature. One of:
Interface number, for interfaces.
Endpoint number, for endpoints.
0 for devices.
USB_FLAGS_SLEEP is the only flag recognized. Wait for completion and do not call callback.
Callback handler to notify of asynchronous completion.
Second argument passed to callback handler.
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.
Feature was successfully cleared.
dip argument is NULL.
pipe_handle argument is NULL
Called from interrupt context with USB_FLAGS_SLEEP flag set.
Clearing of feature was unsuccessful.
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_callback_flags(9S) for more information on callbacks.
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);
}
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| Architecture PCI-based systems |
| Interface stability Committed |