canbuscore.c

canbus4linux,来自www.sourceforge.net

/*
 * canbuscore.c
 * Copyright (c) 2001 J黵gen Eder <[e-mail]>
 *
 * A general canbus driver. To use this, you need also a
 * hardware driver (for example: sja1000.o + can200par.o).
 * Tested under Linux 2.4.20 on i386 PC architecture.
 * 
 * 		installation:
 * 		
 * 		make all
 * 		make install
 * 		
 * 		char-major numbers up to 240 are "LOCAL/EXPERIMENTAL" (see /usr/src/linux/Documentation/devices.txt)
 * 		char-major 91 is reserved for CAN BUS
 * 		insert following lines into /etc/modules.conf:
 * 		
 * 		only ELEKTOR CAN Card
 * 		--------------------------------------------------
 * 		alias char-major-91     elektor_canpar
 *
 *
 * 		or only CAN200 Card
 * 	    --------------------------------------------------
 * 		alias char-major-91     can200par
 *
 *
 * 		or both CAN Cards (kernel < 2.4.0)
 * 	    --------------------------------------------------
 * 		alias char-major-91     elektor_canpar
 * 		post-install elektor_canpar /sbin/modprobe "-k" can200par
 *
 *
 * 		or both CAN Cards (kernel >= 2.4.0, this also work with 2.2.x)
 * 	    --------------------------------------------------
 * 		alias char-major-91     canbus
 * 		probeall canbus elektor_canpar can200par
 * 	    --------------------------------------------------
 * 	    
 * 	    Also set the IRQ for the parport driver
 * 	    for example (IRQ 7 for LPT1):
 * 	    --------------------------------------------------
 *      options parport_pc io=0x378  irq=7,none
 * 	    --------------------------------------------------
 * 	    
 * 	    After changing "modules.conf" do a "depmod -a"
 * 
 *      Kernel > 2.5 need a "generate-modprobe.conf"
 *
 *      Reload the parport driver:
 *      rmmod parport_pc
 *      modprobe parport_pc io=0x378 irq=7
 *
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#define EXPORT_SYMTAB
#define CANBUS4LINUX_CLEARTEXT_COMMANDS
#include <linux/version.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/parport.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/delay.h>
#include <linux/time.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,67)
#include <linux/fs.h>
#include <linux/kdev_t.h>
#endif

#include "trace.h"
#include "canbus4linux.h"

#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif


static int major=91;
static int virtualize=1;
static char *version = "0.2.1";

#define CANBUS4LINUX_PROC_DIR "canbus"

#define NUM_CANBUS_DEVICES 10
#define MAX_DEVICE_INFO (2*MAX_DEVICE_NAME_LENGTH)
#define NUMBER_OF_WRITE_BUFFER (100)
#define MAX_EVENTS (2*NUMBER_OF_WRITE_BUFFER)

int canbus4linux_fasync(int fd, struct file *file, int mode);
void *Allocate_Memory(unsigned long s);
void Free_Memory(void *p);
struct canbus_time GetTime(void);
static struct canbus_admin canbus4linux_admin[NUM_CANBUS_DEVICES];
static struct proc_dir_entry *canbus4linux_proc_dir=NULL;

struct canbus_intern_transmit 
{
	struct canbus_transmit_data data;
	struct file *fa_file;
};

struct proc_registers
{
	struct canbus_admin *pAdmin;
	u16 register_nr;
};

struct canbus_file;
struct canbus_admin
{
	/* 			W I C H T I G
	 * 			Bei 膎derungen mu