drivers/ec_module.c
author Florian Pose <fp@igh-essen.com>
Fri, 16 Dec 2005 09:44:54 +0000
branchkernel2.6
changeset 32 7d9809fbf7b9
parent 27 d75ef6b46e33
child 33 f4171b8aadf8
permissions -rw-r--r--
rt-Verzeichnis aufger?umt.
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/******************************************************************************
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 *
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 *  ec_module.c
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 *
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 *  EtherCAT-Master-Treiber
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 *
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 *  Autoren: Wilhelm Hagemeister, Florian Pose
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 *
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 *  $Id$
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 *
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 *  (C) Copyright IgH 2005
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 *  Ingenieurgemeinschaft IgH
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 *  Heinz-Bäcker Str. 34
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 *  D-45356 Essen
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 *  Tel.: +49 201/61 99 31
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 *  Fax.: +49 201/61 98 36
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 *  E-mail: sp@igh-essen.com
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 *
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 ******************************************************************************/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include "ec_module.h"
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/******************************************************************************/
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#define SUBVERSION_ID "$Id$"
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int ecat_master_count = 1;
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EtherCAT_master_t *ecat_masters = NULL;
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/******************************************************************************/
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MODULE_AUTHOR ("Wilhelm Hagemeister <hm@igh-essen.com>, Florian Pose <fp@igh-essen.com>");
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MODULE_DESCRIPTION ("EtherCAT master driver module");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(SUBVERSION_ID);
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module_param(ecat_master_count, int, 1);
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MODULE_PARM_DESC(ecat_master_count, "Number of EtherCAT master to initialize.");
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module_init(ecat_init_module);
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module_exit(ecat_cleanup_module);
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EXPORT_SYMBOL(EtherCAT_master);
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/******************************************************************************/
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/**
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   Init-Funktion des EtherCAT-Master-Treibermodules
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   Initialisiert soviele Master, wie im Parameter ecat_master_count
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   angegeben wurde (Default ist 1).
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   @returns 0, wenn alles o.k., -1 bei ungueltiger Anzahl Master
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            oder zu wenig Speicher.
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*/
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int __init ecat_init_module(void)
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{
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  unsigned int i;
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  printk(KERN_ERR "EtherCAT: Master driver %s\n", SUBVERSION_ID);
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  if (ecat_master_count < 1)
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  {
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    printk(KERN_ERR "EtherCAT: Error - Illegal ecat_master_count: %i\n",
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           ecat_master_count);
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    return -1;
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  }
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  printk(KERN_ERR "EtherCAT: Initializing %i EtherCAT master(s)...\n",
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         ecat_master_count);
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  if ((ecat_masters = (EtherCAT_master_t *) kmalloc(sizeof(EtherCAT_master_t)
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                                                    * ecat_master_count,
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                                                    GFP_KERNEL)) == NULL)
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  {
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    printk(KERN_ERR "EtherCAT: Could not allocate memory for EtherCAT master(s)!\n");
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    return -1;
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  }
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  for (i = 0; i < ecat_master_count; i++)
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  {
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    EtherCAT_master_init(&ecat_masters[i]);
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  }
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  printk(KERN_ERR "EtherCAT: Master driver initialized.\n");
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  return 0;
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}
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/******************************************************************************/
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/**
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   Cleanup-Funktion des EtherCAT-Master-Treibermoduls
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   Entfernt alle Master-Instanzen.
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*/
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void __exit ecat_cleanup_module(void)
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{
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  unsigned int i;
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  printk(KERN_ERR "EtherCAT: Cleaning up master driver...\n");
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  if (ecat_masters)
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  {
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    for (i = 0; i < ecat_master_count; i++)
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    {
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      EtherCAT_master_clear(&ecat_masters[i]);
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    }
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    kfree(ecat_masters);
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  }
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  printk(KERN_ERR "EtherCAT: Master driver cleaned up.\n");
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}
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/******************************************************************************/
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/**
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   Gibt einen Zeiger auf einen bestimmten EtherCAT-Master zurueck.
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   @param index Index des gewuenschten Masters
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   @returns Zeiger auf EtherCAT-Master oder NULL, wenn Parameter ungueltig.
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*/
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EtherCAT_master_t *EtherCAT_master(int index)
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{
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  if (index < 0 || index >= ecat_master_count)
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  {
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    printk(KERN_ERR "EtherCAT: Master %i does not exist!\n", index);
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    return NULL;
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  }
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  return &ecat_masters[index];
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}
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/******************************************************************************/