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List:       linux-admin
Subject:    Doubt
From:       "T.Senthil Nathan" <tsenthil () nimbus ! ee ! iitm ! ernet ! in>
Date:       2001-12-16 11:48:36
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Dear sir,
  I have a doubt in device driver, I have created device called NIC with
major number as 60 and minor 0, with a dummy device driver as follows. 



#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>

#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/malloc.h>
#include <linux/string.h>

#define EXPORT_SYMTAB

#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h> 
#include <asm/dma.h>
#include <asm/segment.h> 

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/if_slip.h>

/* #include <linux/vmalloc.h> */
/* #include "/usr/src/linux/include/asm-i386/io.h" */

#if CONFIG_MODVERSIONS==1
#define MODVERSIONS
#include <linux/modversions.h>
#endif

#define NIC_MAJOR	60
#define	NIC_DEV		"NIC"


static long NIC_read (struct inode* inode, struct file* file, char *buf,
int count)
{
        printk("Trying to read something from the device\n");

}

static int NIC_write(struct inode* inode, struct file* file, const char
*buf, int count)
  {
        printk("Trying to write something into the device with count %d
\n",count);
  }

static int NIC_open(struct inode *inode, struct file *file)
  {
    printk("Trying to open the device\n"); 
    return 0;
  }

static void NIC_close(struct inode *inode,struct file *file)
  {
  }

static int NIC_ioctl(struct inode *inode, struct file * file, unsigned
int cmd, unsigned long arg)
  {
  }

/* NIC file operation table */
static struct file_operations NIC_fops = {
        NULL,    	/* NIC_lseek */
	NIC_read,	/* NIC_read */
        NIC_write,      /* NIC_write */
	NULL,		/* NIC_readdir */
	NULL,		/* NIC_select */
        NIC_ioctl,      /* NIC_ioctl */
	NULL,		/* NIC_mmap */
        NIC_open,       /* NIC_open */
        NIC_close,      /* NIC_release */
	NULL,
	NULL,
	NULL,
	NULL
};

int init_module(void)
{
  if (register_chrdev(NIC_MAJOR, NIC_DEV, &NIC_fops))
    {
      printk("unable to get major %d for device OSI\n", NIC_MAJOR);
    }

    printk("init_module() : Installing driver for kNIC \n");
    printk("PCI DETECTION&CONFIGURATION STARTED \n");    
    return 0;
}

This driver contains nothing just the printk for control flow and the
printk for no of bytes to be written in to device in NIC_write. The
printk added in NIC_write not printing the exact count(only in 6.2)
which I am passing from the application code, but it printing the proper
count in 5.2 can u please explain why this problem and give me some
solution for that. When compiling this code its giving some warning in
the intialisation of file_operation structure instance NIC-fops, this
can be taken as some clue.
			Senthil.
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