/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 * Copyright (c) 2025-2026 STMicroelectronics.
 *
 * 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                                                        */
/**                                                                       */
/**   STM32 Controller Driver                                             */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/

#define UX_SOURCE_CODE
#define UX_DCD_STM32_SOURCE_CODE


/* Include necessary system files.  */

#include "ux_api.h"
#include "ux_dcd_stm32.h"
#include "ux_utility.h"
#include "ux_device_stack.h"


#if !defined(UX_DEVICE_STANDALONE)
/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _ux_dcd_stm32_transfer_request                      PORTABLE C      */
/*                                                           6.4.1        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Chaoqiong Xiao, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function will initiate a transfer to a specific endpoint.      */
/*    If the endpoint is IN, the endpoint register will be set to accept  */
/*    the request.                                                        */
/*                                                                        */
/*    If the endpoint is IN, the endpoint FIFO will be filled with the    */
/*    buffer and the endpoint register set.                               */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    dcd_stm32                             Pointer to device controller  */
/*    transfer_request                      Pointer to transfer request   */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    Completion Status                                                   */
/*                                                                        */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    HAL_PCD_SetEndpointTransmit           Transmit data                 */
/*    HAL_PCD_SetEndpointReceive            Receive data                  */
/*    _ux_utility_semaphore_get             Get semaphore                 */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    STM32 Controller Driver                                             */
/*                                                                        */
/*  RELEASE HISTORY                                                       */
/*                                                                        */
/*    DATE              NAME                      DESCRIPTION             */
/*                                                                        */
/*  05-19-2020     Chaoqiong Xiao           Initial Version 6.0           */
/*  09-30-2020     Chaoqiong Xiao           Modified comment(s), used ST  */
/*                                            HAL library to drive the    */
/*                                            controller,                 */
/*                                            resulting in version 6.1    */
/*                                                                        */
/**************************************************************************/
UINT _ux_dcd_stm32_transfer_request(UX_DCD_STM32 *dcd_stm32, UX_SLAVE_TRANSFER *transfer_request)
{

  UX_SLAVE_ENDPOINT       *endpoint;
  UINT                    status;


  /* Get the pointer to the logical endpoint from the transfer request.  */
  endpoint =  transfer_request -> ux_slave_transfer_request_endpoint;

  /* Check for transfer direction.  Is this a IN endpoint ? */
  if (transfer_request -> ux_slave_transfer_request_phase == UX_TRANSFER_PHASE_DATA_OUT)
  {

    /* Transmit data.  */
    HAL_PCD_SetEndpointTransmit(dcd_stm32 -> pcd_handle,
                                endpoint->ux_slave_endpoint_descriptor.bEndpointAddress,
                                transfer_request->ux_slave_transfer_request_data_pointer,
                                transfer_request->ux_slave_transfer_request_requested_length);

    /* If the endpoint is a Control endpoint, all this is happening under Interrupt and there is no
    thread to suspend.  */
    if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & (UINT)~UX_ENDPOINT_DIRECTION) != 0)
    {

      /* We should wait for the semaphore to wake us up.  */
      status =  _ux_utility_semaphore_get(&transfer_request -> ux_slave_transfer_request_semaphore,
                                          (ULONG)transfer_request -> ux_slave_transfer_request_timeout);

      /* Check the completion code. */
      if (status != UX_SUCCESS)
        return(status);

      transfer_request -> ux_slave_transfer_request_actual_length = transfer_request->ux_slave_transfer_request_requested_length;

      /* Check the transfer request completion code. We may have had a BUS reset or
      a device disconnection.  */
      if (transfer_request -> ux_slave_transfer_request_completion_code != UX_SUCCESS)
        return(transfer_request -> ux_slave_transfer_request_completion_code);

      /* Return to caller with success.  */
      return(UX_SUCCESS);
    }
  }
  else
  {

    /* We have a request for a SETUP or OUT Endpoint.  */
    /* Receive data.  */
    HAL_PCD_SetEndpointReceive(dcd_stm32 -> pcd_handle,
                               endpoint->ux_slave_endpoint_descriptor.bEndpointAddress,
                               transfer_request->ux_slave_transfer_request_data_pointer,
                               transfer_request->ux_slave_transfer_request_requested_length);

    /* If the endpoint is a Control endpoint, all this is happening under Interrupt and there is no
    thread to suspend.  */
    if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & (UINT)~UX_ENDPOINT_DIRECTION) != 0)
    {

      /* We should wait for the semaphore to wake us up.  */
      status =  _ux_utility_semaphore_get(&transfer_request -> ux_slave_transfer_request_semaphore,
                                          (ULONG)transfer_request -> ux_slave_transfer_request_timeout);

      /* Check the completion code. */
      if (status != UX_SUCCESS)
        return(status);

      /* Check the transfer request completion code. We may have had a BUS reset or
      a device disconnection.  */
      if (transfer_request -> ux_slave_transfer_request_completion_code != UX_SUCCESS)
        return(transfer_request -> ux_slave_transfer_request_completion_code);

      /* Return to caller with success.  */
      return(UX_SUCCESS);
    }
  }

  /* Return to caller with success.  */
  return(UX_SUCCESS);
}
#endif
