/**
  ******************************************************************************
  * @file    usbd_req.c
  * @author  MCD Application Team
  * @brief   This file provides the standard USB requests following chapter 9.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2015 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                      www.st.com/SLA0044
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "usbd_ctlreq.h"
#include "usbd_ioreq.h"


/** @addtogroup STM32_USBD_STATE_DEVICE_LIBRARY
  * @{
  */


/** @defgroup USBD_REQ
  * @brief USB standard requests module
  * @{
  */

/** @defgroup USBD_REQ_Private_TypesDefinitions
  * @{
  */

/**
  * @}
  */


/** @defgroup USBD_REQ_Private_Defines
  * @{
  */

/**
  * @}
  */


/** @defgroup USBD_REQ_Private_Macros
  * @{
  */

/**
  * @}
  */


/** @defgroup USBD_REQ_Private_Variables
  * @{
  */

/**
  * @}
  */


/** @defgroup USBD_REQ_Private_FunctionPrototypes
  * @{
  */
static void USBD_GetDescriptor(USBD_HandleTypeDef *pdev,
                               USBD_SetupReqTypedef *req);

static void USBD_SetAddress(USBD_HandleTypeDef *pdev,
                            USBD_SetupReqTypedef *req);

static void USBD_SetConfig(USBD_HandleTypeDef *pdev,
                           USBD_SetupReqTypedef *req);

static void USBD_GetConfig(USBD_HandleTypeDef *pdev,
                           USBD_SetupReqTypedef *req);

static void USBD_GetStatus(USBD_HandleTypeDef *pdev,
                           USBD_SetupReqTypedef *req);

static void USBD_SetFeature(USBD_HandleTypeDef *pdev,
                            USBD_SetupReqTypedef *req);

static void USBD_ClrFeature(USBD_HandleTypeDef *pdev,
                            USBD_SetupReqTypedef *req);

static uint8_t USBD_GetLen(uint8_t *buf);

/**
  * @}
  */


/** @defgroup USBD_REQ_Private_Functions
  * @{
  */


/**
* @brief  USBD_StdDevReq
*         Handle standard usb device requests
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
USBD_StatusTypeDef  USBD_StdDevReq(USBD_HandleTypeDef *pdev,
                                   USBD_SetupReqTypedef *req)
{
  USBD_StatusTypeDef ret = USBD_OK;

  switch (req->bmRequest & USB_REQ_TYPE_MASK)
  {
    case USB_REQ_TYPE_CLASS:
    case USB_REQ_TYPE_VENDOR:
      pdev->pClass->Setup(pdev, req);
      break;

    case USB_REQ_TYPE_STANDARD:
      switch (req->bRequest)
      {
        case USB_REQ_GET_DESCRIPTOR:
          USBD_GetDescriptor(pdev, req);
          break;

        case USB_REQ_SET_ADDRESS:
          USBD_SetAddress(pdev, req);
          break;

        case USB_REQ_SET_CONFIGURATION:
          USBD_SetConfig(pdev, req);
          break;

        case USB_REQ_GET_CONFIGURATION:
          USBD_GetConfig(pdev, req);
          break;

        case USB_REQ_GET_STATUS:
          USBD_GetStatus(pdev, req);
          break;

        case USB_REQ_SET_FEATURE:
          USBD_SetFeature(pdev, req);
          break;

        case USB_REQ_CLEAR_FEATURE:
          USBD_ClrFeature(pdev, req);
          break;

        default:
          USBD_CtlError(pdev, req);
          break;
      }
      break;

    default:
      USBD_CtlError(pdev, req);
      break;
  }

  return ret;
}

/**
* @brief  USBD_StdItfReq
*         Handle standard usb interface requests
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
USBD_StatusTypeDef  USBD_StdItfReq(USBD_HandleTypeDef *pdev,
                                   USBD_SetupReqTypedef  *req)
{
  USBD_StatusTypeDef ret = USBD_OK;

  switch (req->bmRequest & USB_REQ_TYPE_MASK)
  {
    case USB_REQ_TYPE_CLASS:
    case USB_REQ_TYPE_VENDOR:
    case USB_REQ_TYPE_STANDARD:
      switch (pdev->dev_state)
      {
        case USBD_STATE_DEFAULT:
        case USBD_STATE_ADDRESSED:
        case USBD_STATE_CONFIGURED:

          if (LOBYTE(req->wIndex) <= USBD_MAX_NUM_INTERFACES)
          {
            ret = (USBD_StatusTypeDef)pdev->pClass->Setup(pdev, req);

            if ((req->wLength == 0U) && (ret == USBD_OK))
            {
              USBD_CtlSendStatus(pdev);
            }
          }
          else
          {
            USBD_CtlError(pdev, req);
          }
          break;

        default:
          USBD_CtlError(pdev, req);
          break;
      }
      break;

    default:
      USBD_CtlError(pdev, req);
      break;
  }

  return USBD_OK;
}

/**
* @brief  USBD_StdEPReq
*         Handle standard usb endpoint requests
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
USBD_StatusTypeDef  USBD_StdEPReq(USBD_HandleTypeDef *pdev,
                                  USBD_SetupReqTypedef  *req)
{
  USBD_EndpointTypeDef *pep;
  uint8_t   ep_addr;
  USBD_StatusTypeDef ret = USBD_OK;
  ep_addr  = LOBYTE(req->wIndex);

  switch (req->bmRequest & USB_REQ_TYPE_MASK)
  {
    case USB_REQ_TYPE_CLASS:
    case USB_REQ_TYPE_VENDOR:
      pdev->pClass->Setup(pdev, req);
      break;

    case USB_REQ_TYPE_STANDARD:
      /* Check if it is a class request */
      if ((req->bmRequest & 0x60U) == 0x20U)
      {
        ret = (USBD_StatusTypeDef)pdev->pClass->Setup(pdev, req);

        return ret;
      }

      switch (req->bRequest)
      {
        case USB_REQ_SET_FEATURE:
          switch (pdev->dev_state)
          {
            case USBD_STATE_ADDRESSED:
              if ((ep_addr != 0x00U) && (ep_addr != 0x80U))
              {
                USBD_LL_StallEP(pdev, ep_addr);
                USBD_LL_StallEP(pdev, 0x80U);
              }
              else
              {
                USBD_CtlError(pdev, req);
              }
              break;

            case USBD_STATE_CONFIGURED:
              if (req->wValue == USB_FEATURE_EP_HALT)
              {
                if ((ep_addr != 0x00U) &&
                    (ep_addr != 0x80U) && (req->wLength == 0x00U))
                {
                  USBD_LL_StallEP(pdev, ep_addr);
                }
              }
              USBD_CtlSendStatus(pdev);

              break;

            default:
              USBD_CtlError(pdev, req);
              break;
          }
          break;

        case USB_REQ_CLEAR_FEATURE:

          switch (pdev->dev_state)
          {
            case USBD_STATE_ADDRESSED:
              if ((ep_addr != 0x00U) && (ep_addr != 0x80U))
              {
                USBD_LL_StallEP(pdev, ep_addr);
                USBD_LL_StallEP(pdev, 0x80U);
              }
              else
              {
                USBD_CtlError(pdev, req);
              }
              break;

            case USBD_STATE_CONFIGURED:
              if (req->wValue == USB_FEATURE_EP_HALT)
              {
                if ((ep_addr & 0x7FU) != 0x00U)
                {
                  USBD_LL_ClearStallEP(pdev, ep_addr);
                }
                USBD_CtlSendStatus(pdev);
              }
              break;

            default:
              USBD_CtlError(pdev, req);
              break;
          }
          break;

        case USB_REQ_GET_STATUS:
          switch (pdev->dev_state)
          {
            case USBD_STATE_ADDRESSED:
              if ((ep_addr != 0x00U) && (ep_addr != 0x80U))
              {
                USBD_CtlError(pdev, req);
                break;
              }
              pep = ((ep_addr & 0x80U) == 0x80U) ? &pdev->ep_in[ep_addr & 0x7FU] : \
                    &pdev->ep_out[ep_addr & 0x7FU];

              pep->status = 0x0000U;

              USBD_CtlSendData(pdev, (uint8_t *)(void *)&pep->status, 2U);
              break;

            case USBD_STATE_CONFIGURED:
              if ((ep_addr & 0x80U) == 0x80U)
              {
                if (pdev->ep_in[ep_addr & 0xFU].is_used == 0U)
                {
                  USBD_CtlError(pdev, req);
                  break;
                }
              }
              else
              {
                if (pdev->ep_out[ep_addr & 0xFU].is_used == 0U)
                {
                  USBD_CtlError(pdev, req);
                  break;
                }
              }

              pep = ((ep_addr & 0x80U) == 0x80U) ? &pdev->ep_in[ep_addr & 0x7FU] : \
                    &pdev->ep_out[ep_addr & 0x7FU];

              if ((ep_addr == 0x00U) || (ep_addr == 0x80U))
              {
                pep->status = 0x0000U;
              }
              else if (USBD_LL_IsStallEP(pdev, ep_addr))
              {
                pep->status = 0x0001U;
              }
              else
              {
                pep->status = 0x0000U;
              }

              USBD_CtlSendData(pdev, (uint8_t *)(void *)&pep->status, 2U);
              break;

            default:
              USBD_CtlError(pdev, req);
              break;
          }
          break;

        default:
          USBD_CtlError(pdev, req);
          break;
      }
      break;

    default:
      USBD_CtlError(pdev, req);
      break;
  }

  return ret;
}


/**
* @brief  USBD_GetDescriptor
*         Handle Get Descriptor requests
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
static void USBD_GetDescriptor(USBD_HandleTypeDef *pdev,
                               USBD_SetupReqTypedef *req)
{
  uint16_t len = 0U;
  uint8_t *pbuf = NULL;
  uint8_t err = 0U;

  switch (req->wValue >> 8)
  {
#if (USBD_LPM_ENABLED == 1U)
    case USB_DESC_TYPE_BOS:
      if (pdev->pDesc->GetBOSDescriptor != NULL)
      {
        pbuf = pdev->pDesc->GetBOSDescriptor(pdev->dev_speed, &len);
      }
      else
      {
        USBD_CtlError(pdev, req);
        err++;
      }
      break;
#endif
    case USB_DESC_TYPE_DEVICE:
      pbuf = pdev->pDesc->GetDeviceDescriptor(pdev->dev_speed, &len);
      break;

    case USB_DESC_TYPE_CONFIGURATION:
      if (pdev->dev_speed == USBD_SPEED_HIGH)
      {
        pbuf = pdev->pClass->GetHSConfigDescriptor(&len);
        pbuf[1] = USB_DESC_TYPE_CONFIGURATION;
      }
      else
      {
        pbuf = pdev->pClass->GetFSConfigDescriptor(&len);
        pbuf[1] = USB_DESC_TYPE_CONFIGURATION;
      }
      break;

    case USB_DESC_TYPE_STRING:
      switch ((uint8_t)(req->wValue))
      {
        case USBD_IDX_LANGID_STR:
          if (pdev->pDesc->GetLangIDStrDescriptor != NULL)
          {
            pbuf = pdev->pDesc->GetLangIDStrDescriptor(pdev->dev_speed, &len);
          }
          else
          {
            USBD_CtlError(pdev, req);
            err++;
          }
          break;

        case USBD_IDX_MFC_STR:
          if (pdev->pDesc->GetManufacturerStrDescriptor != NULL)
          {
            pbuf = pdev->pDesc->GetManufacturerStrDescriptor(pdev->dev_speed, &len);
          }
          else
          {
            USBD_CtlError(pdev, req);
            err++;
          }
          break;

        case USBD_IDX_PRODUCT_STR:
          if (pdev->pDesc->GetProductStrDescriptor != NULL)
          {
            pbuf = pdev->pDesc->GetProductStrDescriptor(pdev->dev_speed, &len);
          }
          else
          {
            USBD_CtlError(pdev, req);
            err++;
          }
          break;

        case USBD_IDX_SERIAL_STR:
          if (pdev->pDesc->GetSerialStrDescriptor != NULL)
          {
            pbuf = pdev->pDesc->GetSerialStrDescriptor(pdev->dev_speed, &len);
          }
          else
          {
            USBD_CtlError(pdev, req);
            err++;
          }
          break;

        case USBD_IDX_CONFIG_STR:
          if (pdev->pDesc->GetConfigurationStrDescriptor != NULL)
          {
            pbuf = pdev->pDesc->GetConfigurationStrDescriptor(pdev->dev_speed, &len);
          }
          else
          {
            USBD_CtlError(pdev, req);
            err++;
          }
          break;

        case USBD_IDX_INTERFACE_STR:
          if (pdev->pDesc->GetInterfaceStrDescriptor != NULL)
          {
            pbuf = pdev->pDesc->GetInterfaceStrDescriptor(pdev->dev_speed, &len);
          }
          else
          {
            USBD_CtlError(pdev, req);
            err++;
          }
          break;

        default:
#if (USBD_SUPPORT_USER_STRING_DESC == 1U)
          if (pdev->pClass->GetUsrStrDescriptor != NULL)
          {
            pbuf = pdev->pClass->GetUsrStrDescriptor(pdev, (req->wValue), &len);
          }
          else
          {
            USBD_CtlError(pdev, req);
            err++;
          }
          break;
#else
          USBD_CtlError(pdev, req);
          err++;
#endif
      }
      break;

    case USB_DESC_TYPE_DEVICE_QUALIFIER:
      if (pdev->dev_speed == USBD_SPEED_HIGH)
      {
        pbuf = pdev->pClass->GetDeviceQualifierDescriptor(&len);
      }
      else
      {
        USBD_CtlError(pdev, req);
        err++;
      }
      break;

    case USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION:
      if (pdev->dev_speed == USBD_SPEED_HIGH)
      {
        pbuf = pdev->pClass->GetOtherSpeedConfigDescriptor(&len);
        pbuf[1] = USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION;
      }
      else
      {
        USBD_CtlError(pdev, req);
        err++;
      }
      break;

    default:
      USBD_CtlError(pdev, req);
      err++;
      break;
  }

  if (err != 0U)
  {
    return;
  }
  else
  {
    if ((len != 0U) && (req->wLength != 0U))
    {
      len = MIN(len, req->wLength);
      (void)USBD_CtlSendData(pdev, pbuf, len);
    }

    if (req->wLength == 0U)
    {
      (void)USBD_CtlSendStatus(pdev);
    }
  }
}

/**
* @brief  USBD_SetAddress
*         Set device address
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
static void USBD_SetAddress(USBD_HandleTypeDef *pdev,
                            USBD_SetupReqTypedef *req)
{
  uint8_t  dev_addr;

  if ((req->wIndex == 0U) && (req->wLength == 0U) && (req->wValue < 128U))
  {
    dev_addr = (uint8_t)(req->wValue) & 0x7FU;

    if (pdev->dev_state == USBD_STATE_CONFIGURED)
    {
      USBD_CtlError(pdev, req);
    }
    else
    {
      pdev->dev_address = dev_addr;
      USBD_LL_SetUSBAddress(pdev, dev_addr);
      USBD_CtlSendStatus(pdev);

      if (dev_addr != 0U)
      {
        pdev->dev_state = USBD_STATE_ADDRESSED;
      }
      else
      {
        pdev->dev_state = USBD_STATE_DEFAULT;
      }
    }
  }
  else
  {
    USBD_CtlError(pdev, req);
  }
}

/**
* @brief  USBD_SetConfig
*         Handle Set device configuration request
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
static void USBD_SetConfig(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)
{
  static uint8_t cfgidx;

  cfgidx = (uint8_t)(req->wValue);

  if (cfgidx > USBD_MAX_NUM_CONFIGURATION)
  {
    USBD_CtlError(pdev, req);
  }
  else
  {
    switch (pdev->dev_state)
    {
      case USBD_STATE_ADDRESSED:
        if (cfgidx)
        {
          pdev->dev_config = cfgidx;
          pdev->dev_state = USBD_STATE_CONFIGURED;
          if (USBD_SetClassConfig(pdev, cfgidx) == USBD_FAIL)
          {
            USBD_CtlError(pdev, req);
            return;
          }
          USBD_CtlSendStatus(pdev);
        }
        else
        {
          USBD_CtlSendStatus(pdev);
        }
        break;

      case USBD_STATE_CONFIGURED:
        if (cfgidx == 0U)
        {
          pdev->dev_state = USBD_STATE_ADDRESSED;
          pdev->dev_config = cfgidx;
          USBD_ClrClassConfig(pdev, cfgidx);
          USBD_CtlSendStatus(pdev);
        }
        else if (cfgidx != pdev->dev_config)
        {
          /* Clear old configuration */
          USBD_ClrClassConfig(pdev, (uint8_t)pdev->dev_config);

          /* set new configuration */
          pdev->dev_config = cfgidx;
          if (USBD_SetClassConfig(pdev, cfgidx) == USBD_FAIL)
          {
            USBD_CtlError(pdev, req);
            return;
          }
          USBD_CtlSendStatus(pdev);
        }
        else
        {
          USBD_CtlSendStatus(pdev);
        }
        break;

      default:
        USBD_CtlError(pdev, req);
        USBD_ClrClassConfig(pdev, cfgidx);
        break;
    }
  }
}

/**
* @brief  USBD_GetConfig
*         Handle Get device configuration request
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
static void USBD_GetConfig(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)
{
  if (req->wLength != 1U)
  {
    USBD_CtlError(pdev, req);
  }
  else
  {
    switch (pdev->dev_state)
    {
      case USBD_STATE_DEFAULT:
      case USBD_STATE_ADDRESSED:
        pdev->dev_default_config = 0U;
        USBD_CtlSendData(pdev, (uint8_t *)(void *)&pdev->dev_default_config, 1U);
        break;

      case USBD_STATE_CONFIGURED:
        USBD_CtlSendData(pdev, (uint8_t *)(void *)&pdev->dev_config, 1U);
        break;

      default:
        USBD_CtlError(pdev, req);
        break;
    }
  }
}

/**
* @brief  USBD_GetStatus
*         Handle Get Status request
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
static void USBD_GetStatus(USBD_HandleTypeDef *pdev, USBD_SetupReqTypedef *req)
{
  switch (pdev->dev_state)
  {
    case USBD_STATE_DEFAULT:
    case USBD_STATE_ADDRESSED:
    case USBD_STATE_CONFIGURED:
      if (req->wLength != 0x2U)
      {
        USBD_CtlError(pdev, req);
        break;
      }

#if (USBD_SELF_POWERED == 1U)
      pdev->dev_config_status = USB_CONFIG_SELF_POWERED;
#else
      pdev->dev_config_status = 0U;
#endif

      if (pdev->dev_remote_wakeup)
      {
        pdev->dev_config_status |= USB_CONFIG_REMOTE_WAKEUP;
      }

      USBD_CtlSendData(pdev, (uint8_t *)(void *)&pdev->dev_config_status, 2U);
      break;

    default:
      USBD_CtlError(pdev, req);
      break;
  }
}


/**
* @brief  USBD_SetFeature
*         Handle Set device feature request
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
static void USBD_SetFeature(USBD_HandleTypeDef *pdev,
                            USBD_SetupReqTypedef *req)
{
  if (req->wValue == USB_FEATURE_REMOTE_WAKEUP)
  {
    pdev->dev_remote_wakeup = 1U;
    USBD_CtlSendStatus(pdev);
  }
}


/**
* @brief  USBD_ClrFeature
*         Handle clear device feature request
* @param  pdev: device instance
* @param  req: usb request
* @retval status
*/
static void USBD_ClrFeature(USBD_HandleTypeDef *pdev,
                            USBD_SetupReqTypedef *req)
{
  switch (pdev->dev_state)
  {
    case USBD_STATE_DEFAULT:
    case USBD_STATE_ADDRESSED:
    case USBD_STATE_CONFIGURED:
      if (req->wValue == USB_FEATURE_REMOTE_WAKEUP)
      {
        pdev->dev_remote_wakeup = 0U;
        USBD_CtlSendStatus(pdev);
      }
      break;

    default:
      USBD_CtlError(pdev, req);
      break;
  }
}

/**
* @brief  USBD_ParseSetupRequest
*         Copy buffer into setup structure
* @param  pdev: device instance
* @param  req: usb request
* @retval None
*/

void USBD_ParseSetupRequest(USBD_SetupReqTypedef *req, uint8_t *pdata)
{
  req->bmRequest = *(uint8_t *)(pdata);
  req->bRequest = *(uint8_t *)(pdata + 1U);
  req->wValue = SWAPBYTE(pdata + 2U);
  req->wIndex = SWAPBYTE(pdata + 4U);
  req->wLength = SWAPBYTE(pdata + 6U);

}

/**
* @brief  USBD_CtlError
*         Handle USB low level Error
* @param  pdev: device instance
* @param  req: usb request
* @retval None
*/

void USBD_CtlError(USBD_HandleTypeDef *pdev,
                   USBD_SetupReqTypedef *req)
{
  USBD_LL_StallEP(pdev, 0x80U);
  USBD_LL_StallEP(pdev, 0U);
}


/**
  * @brief  USBD_GetString
  *         Convert Ascii string into unicode one
  * @param  desc : descriptor buffer
  * @param  unicode : Formatted string buffer (unicode)
  * @param  len : descriptor length
  * @retval None
  */
void USBD_GetString(uint8_t *desc, uint8_t *unicode, uint16_t *len)
{
  uint8_t idx = 0U;

  if (desc != NULL)
  {
    *len = (uint16_t)USBD_GetLen(desc) * 2U + 2U;
    unicode[idx++] = *(uint8_t *)(void *)len;
    unicode[idx++] = USB_DESC_TYPE_STRING;

    while (*desc != '\0')
    {
      unicode[idx++] = *desc++;
      unicode[idx++] =  0U;
    }
  }
}

/**
  * @brief  USBD_GetLen
  *         return the string length
   * @param  buf : pointer to the ascii string buffer
  * @retval string length
  */
static uint8_t USBD_GetLen(uint8_t *buf)
{
  uint8_t  len = 0U;

  while (*buf != '\0')
  {
    len++;
    buf++;
  }

  return len;
}
/**
  * @}
  */


/**
  * @}
  */


/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/