164 lines
3.0 KiB
C
164 lines
3.0 KiB
C
/*
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* adummy.c: a dummy ATM driver
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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/skbuff.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include <asm/byteorder.h>
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#include <asm/uaccess.h>
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#include <linux/atmdev.h>
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#include <linux/atm.h>
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#include <linux/sonet.h>
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/* version definition */
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#define DRV_VERSION "1.0"
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#define DEV_LABEL "adummy"
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#define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data)
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struct adummy_dev {
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struct atm_dev *atm_dev;
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struct list_head entry;
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};
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/* globals */
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static LIST_HEAD(adummy_devs);
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static int __init
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adummy_start(struct atm_dev *dev)
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{
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dev->ci_range.vpi_bits = 4;
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dev->ci_range.vci_bits = 12;
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return 0;
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}
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static int
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adummy_open(struct atm_vcc *vcc)
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{
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short vpi = vcc->vpi;
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int vci = vcc->vci;
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if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC)
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return 0;
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set_bit(ATM_VF_ADDR, &vcc->flags);
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set_bit(ATM_VF_READY, &vcc->flags);
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return 0;
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}
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static void
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adummy_close(struct atm_vcc *vcc)
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{
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clear_bit(ATM_VF_READY, &vcc->flags);
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clear_bit(ATM_VF_ADDR, &vcc->flags);
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}
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static int
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adummy_send(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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if (vcc->pop)
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vcc->pop(vcc, skb);
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else
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dev_kfree_skb_any(skb);
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atomic_inc(&vcc->stats->tx);
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return 0;
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}
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static int
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adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page)
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{
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int left = *pos;
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if (!left--)
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return sprintf(page, "version %s\n", DRV_VERSION);
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return 0;
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}
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static struct atmdev_ops adummy_ops =
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{
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.open = adummy_open,
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.close = adummy_close,
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.send = adummy_send,
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.proc_read = adummy_proc_read,
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.owner = THIS_MODULE
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};
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static int __init adummy_init(void)
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{
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struct atm_dev *atm_dev;
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struct adummy_dev *adummy_dev;
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int err = 0;
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printk(KERN_ERR "adummy: version %s\n", DRV_VERSION);
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adummy_dev = kzalloc(sizeof(struct adummy_dev),
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GFP_KERNEL);
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if (!adummy_dev) {
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printk(KERN_ERR DEV_LABEL ": kzalloc() failed\n");
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err = -ENOMEM;
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goto out;
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}
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atm_dev = atm_dev_register(DEV_LABEL, &adummy_ops, -1, NULL);
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if (!atm_dev) {
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printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n");
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err = -ENODEV;
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goto out_kfree;
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}
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adummy_dev->atm_dev = atm_dev;
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atm_dev->dev_data = adummy_dev;
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if (adummy_start(atm_dev)) {
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printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n");
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err = -ENODEV;
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goto out_unregister;
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}
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list_add(&adummy_dev->entry, &adummy_devs);
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out:
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return err;
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out_unregister:
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atm_dev_deregister(atm_dev);
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out_kfree:
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kfree(adummy_dev);
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goto out;
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}
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static void __exit adummy_cleanup(void)
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{
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struct adummy_dev *adummy_dev, *next;
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list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) {
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atm_dev_deregister(adummy_dev->atm_dev);
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kfree(adummy_dev);
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}
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}
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module_init(adummy_init);
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module_exit(adummy_cleanup);
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MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>");
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MODULE_DESCRIPTION("dummy ATM driver");
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MODULE_LICENSE("GPL");
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