/*
 *  spreadspace avr utils
 *
 *
 *  Copyright (C) 2013-2018 Christian Pointner <equinox@spreadspace.org>
 *                2013-2014 Othmar Gsenger <otti@wirdorange.org>
 *
 *  This file is part of spreadspace avr utils.
 *
 *  spreadspace avr utils is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  spreadspace avr utils is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>

#include "usbio.h"

#include <LUFA/Drivers/USB/USB.h>
#include "lufa-descriptor-usbserial.h"

/*
             LUFA Library
     Copyright (C) Dean Camera, 2014.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  {
    .Config =
      {
        .ControlInterfaceNumber         = INTERFACE_ID_CDC_CCI,
        .DataINEndpoint                 =
          {
            .Address                = CDC_TX_EPADDR,
            .Size                   = CDC_TXRX_EPSIZE,
            .Banks                  = 1,
          },
        .DataOUTEndpoint                =
          {
            .Address                = CDC_RX_EPADDR,
            .Size                   = CDC_TXRX_EPSIZE,
            .Banks                  = 1,
          },
        .NotificationEndpoint           =
          {
            .Address                = CDC_NOTIFICATION_EPADDR,
            .Size                   = CDC_NOTIFICATION_EPSIZE,
            .Banks                  = 1,
          },
      },
  };

void EVENT_USB_Device_ConfigurationChanged(void)
{
  CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
}

void EVENT_USB_Device_ControlRequest(void)
{
  CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
}
/* end LUFA CDC-ACM specific definitions*/

static int dummy_putchar(char DataByte, FILE *Stream) { return 0; }
static int dummy_getchar(FILE *Stream) { return 0; }
static FILE dummy_stream = FDEV_SETUP_STREAM(dummy_putchar, dummy_getchar, _FDEV_SETUP_RW);
static FILE usb_stream;

void usbio_init(void)
{
  stdin = stdout = stderr = &dummy_stream;

  USB_Init();
  CDC_Device_CreateStream(&VirtualSerial_CDC_Interface,&usb_stream);
}

void usbio_task(void)
{
#if defined(USB_SERIES_4_AVR) || defined(USB_SERIES_6_AVR) || defined(USB_SERIES_7_AVR)
  if(USB_DeviceState == DEVICE_STATE_Unattached && USB_VBUS_GetStatus()) {
    USB_Disable();
    USB_Init();
  }
#endif

  CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
  USB_USBTask();
}

int8_t usbio_is_connected(void)
{
  if(stdin == &usb_stream)
    return 1;
  else
    return 0;
}

int16_t usbio_bytes_received(void)
{
  if(stdin == &usb_stream)
    return CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface);
  else
    return 0;
}

void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
{
  if(CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR)
    stdin = stdout = stderr = &usb_stream;
  else
    stdin = stdout = stderr = &dummy_stream;
}

void EVENT_USB_Device_Disconnect(void)
{
  stdin = stdout = stderr = &dummy_stream;
}