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adummy.c

/*
 * adummy.c: a dummy ATM driver
 */

#include <linux/module.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>

#include <linux/atmdev.h>
#include <linux/atm.h>
#include <linux/sonet.h>

/* version definition */

#define DRV_VERSION "1.0"

#define DEV_LABEL "adummy"

#define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data)

struct adummy_dev {
      struct atm_dev *atm_dev;

      struct list_head entry;
};

/* globals */

static LIST_HEAD(adummy_devs);

static int __init
adummy_start(struct atm_dev *dev)
{
      dev->ci_range.vpi_bits = 4;
      dev->ci_range.vci_bits = 12;

      return 0;
}

static int
adummy_open(struct atm_vcc *vcc)
{
      short vpi = vcc->vpi;
      int vci = vcc->vci;

      if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC)
            return 0;

      set_bit(ATM_VF_ADDR, &vcc->flags);
      set_bit(ATM_VF_READY, &vcc->flags);

      return 0;
}

static void
adummy_close(struct atm_vcc *vcc)
{
      clear_bit(ATM_VF_READY, &vcc->flags);
      clear_bit(ATM_VF_ADDR, &vcc->flags);
}

static int
adummy_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
      if (vcc->pop)
            vcc->pop(vcc, skb);
      else
            dev_kfree_skb_any(skb);
      atomic_inc(&vcc->stats->tx);

      return 0;
}

static int
adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page)
{
      int left = *pos;

      if (!left--)
            return sprintf(page, "version %s\n", DRV_VERSION);

      return 0;
}

static struct atmdev_ops adummy_ops =
{
      .open =           adummy_open,
      .close =    adummy_close,     
      .send =           adummy_send,
      .proc_read =      adummy_proc_read,
      .owner =    THIS_MODULE
};

static int __init adummy_init(void)
{
      struct atm_dev *atm_dev;
      struct adummy_dev *adummy_dev;
      int err = 0;

      printk(KERN_ERR "adummy: version %s\n", DRV_VERSION);

      adummy_dev = kzalloc(sizeof(struct adummy_dev),
                                       GFP_KERNEL);
      if (!adummy_dev) {
            printk(KERN_ERR DEV_LABEL ": kzalloc() failed\n");
            err = -ENOMEM;
            goto out;
      }
      atm_dev = atm_dev_register(DEV_LABEL, &adummy_ops, -1, NULL);
      if (!atm_dev) {
            printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n");
            err = -ENODEV;
            goto out_kfree;
      }

      adummy_dev->atm_dev = atm_dev;
      atm_dev->dev_data = adummy_dev;

      if (adummy_start(atm_dev)) {
            printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n");
            err = -ENODEV;
            goto out_unregister;
      }

      list_add(&adummy_dev->entry, &adummy_devs);
out:
      return err;

out_unregister:
      atm_dev_deregister(atm_dev);
out_kfree:
      kfree(adummy_dev);
      goto out;
}

static void __exit adummy_cleanup(void)
{
      struct adummy_dev *adummy_dev, *next;

      list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) {
            atm_dev_deregister(adummy_dev->atm_dev);
            kfree(adummy_dev);
      }
}

module_init(adummy_init);
module_exit(adummy_cleanup);

MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>");
MODULE_DESCRIPTION("dummy ATM driver");
MODULE_LICENSE("GPL");

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