/** @file fs.c
*
* @author Sylvain Nahas
*
* This module provides FS related function implementation.
*/

/** @par LICENCE
* @verbatim
    Copyright (C) 2009  ADDI-DATA GmbH for the source code of this module.

    ADDI-DATA GmbH
    Airpark Business Center
    Airport Boulevard B210
    77836 Rheinmuenster
    Germany
    Tel: +49(0)7229/1847-0
    Fax: +49(0)7229/1847-200
    http://www.addi-data-com
    info@addi-data.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 shoud find the complete GPL in the COPYING file accompanying
    this source code.
* @endverbatim
*/

#include "apci3120-private.h"



EXPORT_NO_SYMBOLS;
//------------------------------------------------------------------------------
/** open() function of the module for the APCI-XXXX, with lookup though global OS PCI list
* this is for files unmanaged by the driver itself and use the minor device number to identify the board.
*
* When opening, the pci_dev associated to the minor number is looked up
* and associated with the file structure. It avoid further lookup when calling ioctl()
*
*
*/
int apci3120_open_lookup (struct inode *inode, struct file *filp)
{
   if ( APCI3120_INDEX_NOT_VALID(&apci3120_count, MINOR(inode->i_rdev) ) )
   {
   	return -ENODEV;
   }

   filp->private_data = apci3120_lookup_board_by_index(MINOR(inode->i_rdev) );

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
   MOD_INC_USE_COUNT;
#endif
   return 0;
}
//------------------------------------------------------------------------------
/** release() function of the module for the APCI-XXXX, with lookup though global OS PCI list
* this is for files unmanaged by the driver itself and use the minor device number to identify the board
*/
int apci3120_release_lookup (struct inode *inode,struct file *filp)
{

   if ( APCI3120_INDEX_NOT_VALID(&apci3120_count, MINOR(inode->i_rdev) ) )
   {
   	return -ENODEV;
   }

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
   MOD_DEC_USE_COUNT;
#endif
   return 0;
}
//------------------------------------------------------------------------------
/** ioctl() function of the module for the APCI-XXXX, with lookup though global OS PCI list
* this is for files unmanaged by the driver itself and use the minor device number to identify the board
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
int apci3120_ioctl_lookup (struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
#else
long apci3120_ioctl_lookup(struct file *filp, unsigned int cmd, unsigned long arg)
#endif
{
   int ret = 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)

    #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,0)
	struct inode *inode = filp->f_path.dentry->d_inode;
    #else
	struct inode *inode = filp->f_dentry->d_inode;
#endif

#endif
	if (APCI3120_INDEX_NOT_VALID (&apci3120_count, MINOR (inode->i_rdev)))
   {
   	return -ENODEV;
   }

   if (!filp->private_data) // private data is initialised to NULL
   {
   	printk(KERN_CRIT "%s: %s: board data should be affected but is not (did you call open() before ioctl() ?) \n",__DRIVER_NAME, __FUNCTION__);
	return -EBADFD;
   }

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
   lock_kernel();
#endif

   ret = apci3120_do_ioctl( (struct pci_dev*) filp->private_data, cmd,arg);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
   unlock_kernel();
#endif

   return ret;
}



