163 lines
3.0 KiB
C
163 lines
3.0 KiB
C
/*
|
|
* adummy.c: a dummy ATM driver
|
|
*/
|
|
|
|
#include <linux/module.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");
|