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/*

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This file is part of CanFestival, a library implementing CanOpen Stack.

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Copyright (C): Edouard TISSERANT and Francis DUPIN

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See COPYING file for copyrights details.

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This library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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This library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with this library; if not, write to the Free Software

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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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*/

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#include <stdio.h>

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#include <string.h>

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#include <stdlib.h>

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#include <stddef.h>		/* for NULL */

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#include <errno.h>

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#include "config.h"

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#ifdef RTCAN_SOCKET

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#include "rtdm/rtcan.h"

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#define CAN_IFNAME     "rtcan%s"

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#define CAN_SOCKET     rt_dev_socket

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#define CAN_CLOSE      rt_dev_close

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#define CAN_RECV       rt_dev_recv

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#define CAN_SEND       rt_dev_send

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#define CAN_BIND       rt_dev_bind

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#define CAN_IOCTL      rt_dev_ioctl

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#define CAN_ERRNO(err) (-err)

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#else

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#include <sys/socket.h>

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#include <sys/ioctl.h>

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#include "linux/can.h"

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#include "linux/can/raw.h"

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#include "net/if.h"

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#define PF_CAN 29

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#define AF_CAN PF_CAN

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//#include "af_can.h"

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#define CAN_IFNAME     "can%s"

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#define CAN_SOCKET     socket

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#define CAN_CLOSE      close

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#define CAN_RECV       recv

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#define CAN_SEND       send

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#define CAN_BIND       bind

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#define CAN_IOCTL      ioctl

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#define CAN_ERRNO(err) errno

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#endif

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#include "can_driver.h"

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/*********functions which permit to communicate with the board****************/

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UNS8

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canReceive_driver (CAN_HANDLE fd0, Message * m)

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{

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  int res;

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  struct can_frame frame;

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  res = CAN_RECV (*(int *) fd0, &frame, sizeof (frame), 0);

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  if (res < 0)

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    {

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      fprintf (stderr, "Recv failed: %s\n", strerror (CAN_ERRNO (res)));

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      return 1;

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    }

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  m->cob_id.w = frame.can_id & CAN_EFF_MASK;

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  m->len = frame.can_dlc;

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  if (frame.can_id & CAN_RTR_FLAG)

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    m->rtr = 1;

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  else

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    m->rtr = 0;

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  memcpy (m->data, frame.data, 8);

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  return 0;

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}

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/***************************************************************************/

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UNS8

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canSend_driver (CAN_HANDLE fd0, Message * m)

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{

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  int res;

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  struct can_frame frame;

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  frame.can_id = m->cob_id.w;

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  if (frame.can_id >= 0x800)

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    frame.can_id |= CAN_EFF_FLAG;

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  frame.can_dlc = m->len;

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  if (m->rtr)

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    frame.can_id |= CAN_RTR_FLAG;

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  else

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    memcpy (frame.data, m->data, 8);

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  res = CAN_SEND (*(int *) fd0, &frame, sizeof (frame), 0);

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  if (res < 0)

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    {

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      fprintf (stderr, "Send failed: %s\n", strerror (CAN_ERRNO (res)));

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      return 1;

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    }

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  return 0;

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}

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/***************************************************************************/

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#ifdef RTCAN_SOCKET

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int

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TranslateBaudRate (const char *optarg)

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{

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  int baudrate;

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  int val, len;

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  char *pos = NULL;

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  len = strlen (optarg);

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  if (!len)

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    return 0;

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  switch ((int) optarg[len - 1])

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    {

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    case 'M':

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      baudrate = 1000000;

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      break;

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    case 'K':

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      baudrate = 1000;

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      break;

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    default:

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      baudrate = 1;

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      break;

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    }

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  if ((sscanf (optarg, "%i", &val)) == 1)

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    baudrate *= val;

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  else

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    baudrate = 0;;

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  return baudrate;

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}

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#endif

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/***************************************************************************/

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CAN_HANDLE

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canOpen_driver (s_BOARD * board)

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{

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  struct ifreq ifr;

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  struct sockaddr_can addr;

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  int err;

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  CAN_HANDLE fd0 = malloc (sizeof (int));

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#ifdef RTCAN_SOCKET

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  can_baudrate_t *baudrate;

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  can_mode_t *mode;

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#endif

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  *(int *) fd0 = CAN_SOCKET (PF_CAN, SOCK_RAW, CAN_RAW);

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  if (*(int *) fd0 < 0)

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    {

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      fprintf (stderr, "Socket creation failed: %s\n",

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	       strerror (CAN_ERRNO (*(int *) fd0)));

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      goto error_ret;

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    }

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  if (*board->busname >= '0' && *board->busname <= '9')

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    snprintf (ifr.ifr_name, IFNAMSIZ, CAN_IFNAME, board->busname);

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  else

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    strncpy (ifr.ifr_name, board->busname, IFNAMSIZ);

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  err = CAN_IOCTL (*(int *) fd0, SIOCGIFINDEX, &ifr);

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  if (err)

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    {

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      fprintf (stderr, "Getting IF index for %s failed: %s\n",

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	       ifr.ifr_name, strerror (CAN_ERRNO (err)));

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      goto error_close;

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    }

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  addr.can_family = AF_CAN;

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  addr.can_ifindex = ifr.ifr_ifindex;

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  err = CAN_BIND (*(int *) fd0, (struct sockaddr *) &addr, sizeof (addr));

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  if (err)

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    {

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      fprintf (stderr, "Binding failed: %s\n", strerror (CAN_ERRNO (err)));

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      goto error_close;

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    }

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#ifdef RTCAN_SOCKET

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  baudrate = (can_baudrate_t *) & ifr.ifr_ifru;

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  *baudrate = TranslateBaudRate (board->baudrate);

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  if (!*baudrate)

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    goto error_close;

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  err = CAN_IOCTL (*(int *) fd0, SIOCSCANBAUDRATE, &ifr);

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  if (err)

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    {

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      fprintf (stderr,

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	       "Setting baudrate %d failed: %s\n",

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	       *baudrate, strerror (CAN_ERRNO (err)));

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      goto error_close;

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    }

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  mode = (can_mode_t *) & ifr.ifr_ifru;

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  *mode = CAN_MODE_START;

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  err = CAN_IOCTL (*(int *) fd0, SIOCSCANMODE, &ifr);

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  if (err)

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    {

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      fprintf (stderr, "Starting CAN device failed: %s\n",

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	       strerror (CAN_ERRNO (err)));

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      goto error_close;

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    }

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#endif

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  return fd0;

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error_close:

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  CAN_CLOSE (*(int *) fd0);

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error_ret:

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  free (fd0);

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  return NULL;

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}

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/***************************************************************************/

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int

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canClose_driver (CAN_HANDLE fd0)

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{

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  if (fd0)

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    {

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      CAN_CLOSE (*(int *) fd0);

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      free (fd0);

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    }

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  return 0;

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}