pcan_common.h

linux下的CAN BUS驱动代码。适合在arm平台使用。

#ifndef __PCAN_COMMON_H__
#define __PCAN_COMMON_H__

//****************************************************************************
// Copyright (C) 2001-2008  PEAK System-Technik GmbH
//
// [e-mail]
// www.peak-system.com
//
// 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, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// Maintainer(s): Klaus Hitschler ([e-mail])
//
// Major contributions by:
//                Edouard Tisserant ([e-mail]) XENOMAI
//                Laurent Bessard   ([e-mail])   XENOMAI
//                Oliver Hartkopp   ([e-mail]) socketCAN
//                     
//****************************************************************************

//****************************************************************************
//
// global defines to include in all files this module is made of
// ! this must always the 1st include in all files !
//
// $Id: pcan_common.h 543 2008-02-20 11:54:03Z khitschler $
//
//****************************************************************************

//****************************************************************************
// DEFINES
#ifndef __KERNEL__
  #define __KERNEL__
#endif
#ifndef MODULE
  #define MODULE
#endif

#include <linux/version.h>  // if this file is not found: please look @ /boot/vmlinuz.version.h and make a symlink

// support for MODVERSIONS
#include <linux/autoconf.h>
#if defined(CONFIG_MODVERSIONS) && !defined(MODVERSIONS)
  #define MODVERSIONS
#endif

#ifdef MODVERSIONS
  #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
    #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,10)
      #include <config/modversions.h>
  #endif
  #else
    #include <linux/modversions.h>
  #endif
#endif

#ifndef NO_RT
  #include <rtdm/rtdm_driver.h>
  #include <asm/div64.h>
  static inline void rt_gettimeofday(struct timeval *tv) 
  {
      nanosecs_abs_t current_time = rtdm_clock_read(); 
      tv->tv_usec = (do_div(current_time, 1000000000) / 1000);
      tv->tv_sec = current_time;
  	  
  }
  #define DO_GETTIMEOFDAY(tv) rt_gettimeofday(&tv)
#else
  #define DO_GETTIMEOFDAY(tv) do_gettimeofday(&tv)
#endif

// support for PARPORT_SUBSYSTEM
#if !defined(CONFIG_PARPORT_MODULE) && !defined(CONFIG_PARPORT) && defined(PARPORT_SUBSYSTEM)
  #undef PARPORT_SUBSYSTEM
#endif

// support for USB
#if !defined(CONFIG_USB_MODULE) && !defined(CONFIG_USB) && defined(USB_SUPPORT)
  #undef USB_SUPPORT
#endif

// support for PCCARD
#if !defined(CONFIG_PCMCIA_MODULE) && !defined(CONFIG_PCMCIA) && !defined(CONFIG_PCCARD) && defined(PCCARD_SUPPORT)
  #undef PCCARD_SUPPORT
#endif

// support only versions 2.4.x and 2.6.x
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0)
  #error "This kernel is too old and not supported"
#else
  #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
    #define LINUX_24 // >= LINUX 2.4.x && < LINUX 2.6
  #else
    #define LINUX_26 // >= LINUX 2.6
  #endif
#endif

// some preparative defintions for kernel 2.6.x 
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,23)
  typedef void irqreturn_t;
  #define IRQ_NONE
  #define IRQ_HANDLED
  #define IRQ_RETVAL(x)
#endif

// IRQ's return val for Linux and RealTime 
#ifndef NO_RT
  #define PCAN_IRQ_RETVAL(x) x
#else
  #define PCAN_IRQ_RETVAL(x) IRQ_RETVAL(x)
#endif

// count of function variables changed from 2.6.19
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
#define  IRQHANDLER(name, p1, p2, p3) name(p1, p2, p3)
#else
#define  IRQHANDLER(name, p1, p2, p3) name(p1, p2)
#endif

// switch to disable all printks for not debugging
#ifdef DEBUG
  #define DPRINTK printk
#else
  #define DPRINTK(stuff...)
#endif

// to manage differences between kernel versions
int ___request_region(unsigned long from, unsigned long length, const char *name);

// to get smoothly into udev
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,17)
#define UDEV_SUPPORT
#endif

// follow current interrupt definition changes
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
#define IRQF_DISABLED SA_INTERRUPT
#define IRQF_SHARED   SA_SHIRQ
#endif

// different data sink alternatives
#ifdef NETDEV_SUPPORT
#define pcan_xxxdev_rx(dev, frame, time) pcan_netdev_rx(dev, frame, time) 
#else
#define pcan_xxxdev_rx(dev, frame, time) pcan_chardev_rx(dev, frame, time)
#endif

// moved from pcan_main.h 
#define DEVICE_NAME      "pcan"                            // the name of the module and the proc entry

//----------------------------------------------------------------------------
// set here the current release of the driver 'Release_date_nr' synchronous 
// with SVN 
#define CURRENT_RELEASE "Release_20080220_n"  // $name$

#endif // __PCAN_COMMON_H__