/* sane - Scanner Access Now Easy.

   Copyright (C) 2002 Sergey Vlasov <vsu@altlinux.ru>
   Copyright (C) 2002-2007 Henning Geinitz <sane@geinitz.org>

   This file is part of the SANE package.

   This program 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 2 of the
   License, or (at your option) any later version.

   This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.

   As a special exception, the authors of SANE give permission for
   additional uses of the libraries contained in this release of SANE.

   The exception is that, if you link a SANE library with other files
   to produce an executable, this does not by itself cause the
   resulting executable to be covered by the GNU General Public
   License.  Your use of that executable is in no way restricted on
   account of linking the SANE library code into it.

   This exception does not, however, invalidate any other reasons why
   the executable file might be covered by the GNU General Public
   License.

   If you submit changes to SANE to the maintainers to be included in
   a subsequent release, you agree by submitting the changes that
   those changes may be distributed with this exception intact.

   If you write modifications of your own for SANE, it is your choice
   whether to permit this exception to apply to your modifications.
   If you do not wish that, delete this exception notice.
*/

/** @file
 * @brief Implementation of the gt6816 specific functions.
 */

#include "gt68xx_gt6816.h"

SANE_Status
gt6816_check_firmware (GT68xx_Device * dev, SANE_Bool * loaded)
{
  SANE_Status status;
  GT68xx_Packet req;

  memset (req, 0, sizeof (req));
  req[0] = 0x70;
  req[1] = 0x01;

  status = gt68xx_device_small_req (dev, req, req);
  if (status != SANE_STATUS_GOOD)
    {
      /* Assume that firmware is not loaded because without firmware, we need
         64 bytes for the result, not 8 */
      *loaded = SANE_FALSE;
      return SANE_STATUS_GOOD;
    }
  /* check anyway */
  if (req[0] == 0x00 && req[1] == 0x70 && req[2] == 0xff)
    *loaded = SANE_TRUE;
  else
    *loaded = SANE_FALSE;

  return SANE_STATUS_GOOD;
}


#define MAX_DOWNLOAD_BLOCK_SIZE 64

SANE_Status
gt6816_download_firmware (GT68xx_Device * dev,
			  SANE_Byte * data, SANE_Word size)
{
  SANE_Status status;
  SANE_Byte download_buf[MAX_DOWNLOAD_BLOCK_SIZE];
  SANE_Byte check_buf[MAX_DOWNLOAD_BLOCK_SIZE];
  SANE_Byte *block;
  SANE_Word addr, bytes_left;
  GT68xx_Packet boot_req;
  SANE_Word block_size = MAX_DOWNLOAD_BLOCK_SIZE;

  CHECK_DEV_ACTIVE (dev, "gt6816_download_firmware");

  for (addr = 0; addr < size; addr += block_size)
    {
      bytes_left = size - addr;
      if (bytes_left > block_size)
	block = data + addr;
      else
	{
	  memset (download_buf, 0, block_size);
	  memcpy (download_buf, data + addr, bytes_left);
	  block = download_buf;
	}
      RIE (gt68xx_device_memory_write (dev, addr, block_size, block));
      RIE (gt68xx_device_memory_read (dev, addr, block_size, check_buf));
      if (memcmp (block, check_buf, block_size) != 0)
	{
	  DBG (3, "gt6816_download_firmware: mismatch at block 0x%0x\n",
	       addr);
	  return SANE_STATUS_IO_ERROR;
	}
    }

  memset (boot_req, 0, sizeof (boot_req));
  boot_req[0] = 0x69;
  boot_req[1] = 0x01;
  boot_req[2] = LOBYTE (addr);
  boot_req[3] = HIBYTE (addr);
  RIE (gt68xx_device_req (dev, boot_req, boot_req));

  return SANE_STATUS_GOOD;
}


SANE_Status
gt6816_get_power_status (GT68xx_Device * dev, SANE_Bool * power_ok)
{
  SANE_Status status;
  GT68xx_Packet req;

  memset (req, 0, sizeof (req));
  req[0] = 0x3f;
  req[1] = 0x01;

  RIE (gt68xx_device_req (dev, req, req));

  if ((req[0] == 0x00 && req[1] == 0x3f && req[2] == 0x01)
      || (dev->model->flags & GT68XX_FLAG_NO_POWER_STATUS))
    *power_ok = SANE_TRUE;
  else
    *power_ok = SANE_FALSE;

  return SANE_STATUS_GOOD;
}

SANE_Status
gt6816_get_ta_status (GT68xx_Device * dev, SANE_Bool * ta_attached)
{
  SANE_Status status;
  GT68xx_Packet req;

  memset (req, 0, sizeof (req));
  req[0] = 0x28;
  req[1] = 0x01;

  RIE (gt68xx_device_req (dev, req, req));

  if (req[0] == 0x00 && req[1] == 0x28 && (req[8] & 0x01) != 0
      && !dev->model->is_cis)
    *ta_attached = SANE_TRUE;
  else
    *ta_attached = SANE_FALSE;

  return SANE_STATUS_GOOD;
}


SANE_Status
gt6816_lamp_control (GT68xx_Device * dev, SANE_Bool fb_lamp,
		     SANE_Bool ta_lamp)
{
  GT68xx_Packet req;

  memset (req, 0, sizeof (req));
  req[0] = 0x25;
  req[1] = 0x01;
  req[2] = 0;
  if (fb_lamp)
    req[2] |= 0x01;
  if (ta_lamp)
    req[2] |= 0x02;

  return gt68xx_device_req (dev, req, req);
}


SANE_Status
gt6816_is_moving (GT68xx_Device * dev, SANE_Bool * moving)
{
  SANE_Status status;
  GT68xx_Packet req;

  memset (req, 0, sizeof (req));
  req[0] = 0x17;
  req[1] = 0x01;

  RIE (gt68xx_device_req (dev, req, req));

  if (req[0] == 0x00 && req[1] == 0x17)
    {
      if (req[2] == 0 && (req[3] == 0 || req[3] == 2))
	*moving = SANE_FALSE;
      else
	*moving = SANE_TRUE;
    }
  else
    return SANE_STATUS_IO_ERROR;

  return SANE_STATUS_GOOD;
}


SANE_Status
gt6816_carriage_home (GT68xx_Device * dev)
{
  GT68xx_Packet req;

  memset (req, 0, sizeof (req));
  req[0] = 0x24;
  req[1] = 0x01;

  return gt68xx_device_req (dev, req, req);
}


SANE_Status
gt6816_stop_scan (GT68xx_Device * dev)
{
  GT68xx_Packet req;

  memset (req, 0, sizeof (req));
  req[0] = 0x41;
  req[1] = 0x01;

  return gt68xx_device_small_req (dev, req, req);
}

SANE_Status
gt6816_document_present (GT68xx_Device * dev, SANE_Bool * present)
{
  SANE_Status status;
  GT68xx_Packet req;

  memset (req, 0, sizeof (req));
  req[0] = 0x59;
  req[1] = 0x01;

  RIE (gt68xx_device_req (dev, req, req));

  if (req[0] == 0x00 && req[1] == 0x59)
    {
      if (req[2] == 0)
	*present = SANE_FALSE;
      else
	*present = SANE_TRUE;
    }
  else
    return SANE_STATUS_IO_ERROR;

  return SANE_STATUS_GOOD;
}
