text: /* 
   * The MIT License (MIT)
   *
   * Copyright (c) 2019 Ha Thach (tinyusb.org)
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   *
   * This file is part of the TinyUSB stack.
   */
  
  #include "tusb_option.h"
  
  #if (TUSB_OPT_HOST_ENABLED && CFG_TUH_CDC)
  
  #include "host/usbh.h"
  #include "host/usbh_classdriver.h"
  
  #include "cdc_host.h"
  
  //--------------------------------------------------------------------+
  // MACRO CONSTANT TYPEDEF
  //--------------------------------------------------------------------+
  typedef struct {
    uint8_t itf_num;
    uint8_t itf_protocol;
  
    uint8_t ep_notif;
    uint8_t ep_in;
    uint8_t ep_out;
  
    cdc_acm_capability_t acm_capability;
  
  } cdch_data_t;
  
  //--------------------------------------------------------------------+
  // INTERNAL OBJECT & FUNCTION DECLARATION
  //--------------------------------------------------------------------+
  static cdch_data_t cdch_data[CFG_TUSB_HOST_DEVICE_MAX];
  
  static inline cdch_data_t* get_itf(uint8_t dev_addr)
  {
    return &cdch_data[dev_addr-1];
  }
  
  bool tuh_cdc_mounted(uint8_t dev_addr)
  {
    cdch_data_t* cdc = get_itf(dev_addr);
    return cdc->ep_in && cdc->ep_out;
  }
  
  bool tuh_cdc_is_busy(uint8_t dev_addr, cdc_pipeid_t pipeid)
  {
    if ( !tuh_cdc_mounted(dev_addr) ) return false;
  
    cdch_data_t const * p_cdc = get_itf(dev_addr);
  
    switch (pipeid)
    {
      case CDC_PIPE_NOTIFICATION:
        return usbh_edpt_busy(dev_addr, p_cdc->ep_notif );
  
      case CDC_PIPE_DATA_IN:
        return usbh_edpt_busy(dev_addr, p_cdc->ep_in );
  
      case CDC_PIPE_DATA_OUT:
        return usbh_edpt_busy(dev_addr, p_cdc->ep_out );
  
      default:
        return false;
    }
  }
  
  //--------------------------------------------------------------------+
  // APPLICATION API (parameter validation needed)
  //--------------------------------------------------------------------+
  bool tuh_cdc_serial_is_mounted(uint8_t dev_addr)
  {
    // TODO consider all AT Command as serial candidate
    return tuh_cdc_mounted(dev_addr)                                         &&
        (cdch_data[dev_addr-1].itf_protocol <= CDC_COMM_PROTOCOL_ATCOMMAND_CDMA);
  }
  
  bool tuh_cdc_send(uint8_t dev_addr, void const * p_data, uint32_t length, bool is_notify)
  {
    (void) is_notify;
    TU_VERIFY( tuh_cdc_mounted(dev_addr) );
    TU_VERIFY( p_data != NULL && length, TUSB_ERROR_INVALID_PARA);
  
    uint8_t const ep_out = cdch_data[dev_addr-1].ep_out;
    if ( usbh_edpt_busy(dev_addr, ep_out) ) return false;
  
    return usbh_edpt_xfer(dev_addr, ep_out, (void *) p_data, length);
  }
  
  bool tuh_cdc_receive(uint8_t dev_addr, void * p_buffer, uint32_t length, bool is_notify)
  {
    (void) is_notify;
    TU_VERIFY( tuh_cdc_mounted(dev_addr) );
    TU_VERIFY( p_buffer != NULL && length, TUSB_ERROR_INVALID_PARA);
  
    uint8_t const ep_in = cdch_data[dev_addr-1].ep_in;
    if ( usbh_edpt_busy(dev_addr, ep_in) ) return false;
  
    return usbh_edpt_xfer(dev_addr, ep_in, p_buffer, length);
  }
  
  bool tuh_cdc_set_control_line_state(uint8_t dev_addr, bool dtr, bool rts, tuh_control_complete_cb_t complete_cb)
  {
    cdch_data_t const * p_cdc = get_itf(dev_addr);
    tusb_control_request_t const request =
    {
      .bmRequestType_bit =
      {
        .recipient = TUSB_REQ_RCPT_INTERFACE,
        .type      = TUSB_REQ_TYPE_CLASS,
        .direction = TUSB_DIR_OUT
      },
      .bRequest = CDC_REQUEST_SET_CONTROL_LINE_STATE,
      .wValue   = (rts ? 2 : 0) | (dtr ? 1 : 0),
      .wIndex   = p_cdc->itf_num,
      .wLength  = 0
    };
  
    TU_ASSERT( tuh_control_xfer(dev_addr, &request, NULL, complete_cb) );
    return true;
  }
  
  //--------------------------------------------------------------------+
  // USBH-CLASS DRIVER API
  //--------------------------------------------------------------------+
  void cdch_init(void)
  {
    tu_memclr(cdch_data, sizeof(cdch_data_t)*CFG_TUSB_HOST_DEVICE_MAX);
  }
  
  bool cdch_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const *itf_desc, uint16_t max_len)
  {
    (void) max_len;
  
    // Only support ACM subclass
    // Protocol 0xFF can be RNDIS device for windows XP
    TU_VERIFY( TUSB_CLASS_CDC                           == itf_desc->bInterfaceClass &&
               CDC_COMM_SUBCLASS_ABSTRACT_CONTROL_MODEL == itf_desc->bInterfaceSubClass &&
               0xFF                                     != itf_desc->bInterfaceProtocol);
  
    cdch_data_t * p_cdc = get_itf(dev_addr);
  
    p_cdc->itf_num      = itf_desc->bInterfaceNumber;
    p_cdc->itf_protocol = itf_desc->bInterfaceProtocol;
  
    //------------- Communication Interface -------------//
    uint16_t drv_len = tu_desc_len(itf_desc);
    uint8_t const * p_desc = tu_desc_next(itf_desc);
  
    // Communication Functional Descriptors
    while( TUSB_DESC_CS_INTERFACE == tu_desc_type(p_desc) && drv_len <= max_len )
    {
      if ( CDC_FUNC_DESC_ABSTRACT_CONTROL_MANAGEMENT == cdc_functional_desc_typeof(p_desc) )
      {
        // save ACM bmCapabilities
        p_cdc->acm_capability = ((cdc_desc_func_acm_t const *) p_desc)->bmCapabilities;
      }
  
      drv_len += tu_desc_len(p_desc);
      p_desc = tu_desc_next(p_desc);
    }
  
    if ( TUSB_DESC_ENDPOINT == tu_desc_type(p_desc) )
    {
      // notification endpoint
      tusb_desc_endpoint_t const * desc_ep = (tusb_desc_endpoint_t const *) p_desc;
  
      TU_ASSERT( usbh_edpt_open(rhport, dev_addr, desc_ep) );
      p_cdc->ep_notif = desc_ep->bEndpointAddress;
  
      drv_len += tu_desc_len(p_desc);
      p_desc = tu_desc_next(p_desc);
    }
  
    //------------- Data Interface (if any) -------------//
    if ( (TUSB_DESC_INTERFACE == tu_desc_type(p_desc)) &&
         (TUSB_CLASS_CDC_DATA == ((tusb_desc_interface_t const *) p_desc)->bInterfaceClass) )
    {
      // next to endpoint descriptor
      drv_len += tu_desc_len(p_desc);
      p_desc = tu_desc_next(p_desc);
  
      // data endpoints expected to be in pairs
      for(uint32_t i=0; i<2; i++)
      {
        tusb_desc_endpoint_t const *desc_ep = (tusb_desc_endpoint_t const *) p_desc;
        TU_ASSERT(TUSB_DESC_ENDPOINT == desc_ep->bDescriptorType && TUSB_XFER_BULK == desc_ep->bmAttributes.xfer);
  
        TU_ASSERT(usbh_edpt_open(rhport, dev_addr, desc_ep));
  
        if ( tu_edpt_dir(desc_ep->bEndpointAddress) == TUSB_DIR_IN )
        {
          p_cdc->ep_in = desc_ep->bEndpointAddress;
        }else
        {
          p_cdc->ep_out = desc_ep->bEndpointAddress;
        }
  
        drv_len += tu_desc_len(p_desc);
        p_desc = tu_desc_next( p_desc );
      }
    }
  
    return true;
  }
  
  bool cdch_set_config(uint8_t dev_addr, uint8_t itf_num)
  {
    (void) dev_addr; (void) itf_num;
    return true;
  }
  
  bool cdch_xfer_cb(uint8_t dev_addr, uint8_t ep_addr, xfer_result_t event, uint32_t xferred_bytes)
  {
    (void) ep_addr;
    tuh_cdc_xfer_isr( dev_addr, event, 0, xferred_bytes );
    return true;
  }
  
  void cdch_close(uint8_t dev_addr)
  {
    cdch_data_t * p_cdc = get_itf(dev_addr);
    tu_memclr(p_cdc, sizeof(cdch_data_t));
  }
  
  #endif
  