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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Device Stack */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_stack_clear_feature PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function clears a specific feature (Device, Interface, */
/* Endpoint ....). */
/* */
/* INPUT */
/* */
/* request_type Request type */
/* request_value Request value */
/* request_index Request index */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* (ux_slave_dcd_function) DCD dispatch function */
/* */
/* CALLED BY */
/* */
/* Device Stack */
/* */
/**************************************************************************/
UINT _ux_device_stack_clear_feature(ULONG request_type, ULONG request_value, ULONG request_index)
{
UX_SLAVE_DCD *dcd;
UX_SLAVE_DEVICE *device;
UX_SLAVE_INTERFACE *interface_ptr;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_ENDPOINT *endpoint_target;
UX_PARAMETER_NOT_USED(request_value);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_DEVICE_STACK_CLEAR_FEATURE, request_type, request_value, request_index, 0, UX_TRACE_DEVICE_STACK_EVENTS, 0, 0)
/* Get the pointer to the DCD. */
dcd = &_ux_system_slave -> ux_system_slave_dcd;
/* Get the pointer to the device. */
device = &_ux_system_slave -> ux_system_slave_device;
/* Get the control endpoint for the device. */
endpoint = &device -> ux_slave_device_control_endpoint;
/* The request can be for either the device or the endpoint. */
switch (request_type & UX_REQUEST_TARGET)
{
case UX_REQUEST_TARGET_DEVICE:
/* Check if we have a DEVICE_REMOTE_WAKEUP Feature. */
if (request_value == UX_REQUEST_FEATURE_DEVICE_REMOTE_WAKEUP)
{
/* Check if we have the capability. */
if (_ux_system_slave -> ux_system_slave_remote_wakeup_capability)
{
/* Disable the feature. */
_ux_system_slave -> ux_system_slave_remote_wakeup_enabled = UX_FALSE;
}
else
/* Protocol error. */
return (UX_FUNCTION_NOT_SUPPORTED);
}
break;
case UX_REQUEST_TARGET_ENDPOINT:
/* The only clear feature for endpoint is ENDPOINT_STALL. This clears
the endpoint of the stall situation and resets its data toggle.
We need to find the endpoint through the interface(s). */
interface_ptr = device -> ux_slave_device_first_interface;
#if !defined(UX_DEVICE_INITIALIZE_FRAMEWORK_SCAN_DISABLE) || UX_MAX_DEVICE_INTERFACES > 1
while (interface_ptr != UX_NULL)
{
#endif
/* Get the first endpoint for this interface. */
endpoint_target = interface_ptr -> ux_slave_interface_first_endpoint;
/* Parse all the endpoints. */
while (endpoint_target != UX_NULL)
{
/* Check the endpoint index. */
if (endpoint_target -> ux_slave_endpoint_descriptor.bEndpointAddress == request_index)
{
/* Reset the endpoint. */
dcd -> ux_slave_dcd_function(dcd, UX_DCD_RESET_ENDPOINT, endpoint_target);
/* Mark its state now. */
endpoint_target -> ux_slave_endpoint_state = UX_ENDPOINT_RESET;
/* Return the function status. */
return(UX_SUCCESS);
}
/* Next endpoint. */
endpoint_target = endpoint_target -> ux_slave_endpoint_next_endpoint;
}
#if !defined(UX_DEVICE_INITIALIZE_FRAMEWORK_SCAN_DISABLE) || UX_MAX_DEVICE_INTERFACES > 1
/* Next interface. */
interface_ptr = interface_ptr -> ux_slave_interface_next_interface;
}
#endif
/* Intentional fallthrough and go into the default case. */
/* fall through */
/* We get here when the endpoint is wrong. Should not happen though. */
default:
/* We stall the command. */
dcd -> ux_slave_dcd_function(dcd, UX_DCD_STALL_ENDPOINT, endpoint);
/* No more work to do here. The command failed but the upper layer does not depend on it. */
return(UX_SUCCESS);
}
/* Return the function status. */
return(UX_SUCCESS);
}
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