drivers/atm/adummy.c

   1 /*
   2  * adummy.c: a dummy ATM driver
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/version.h>
   7 #include <linux/kernel.h>
   8 #include <linux/skbuff.h>
   9 #include <linux/pci.h>
  10 #include <linux/errno.h>
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13 #include <linux/delay.h>
  14 #include <linux/init.h>
  15 #include <linux/mm.h>
  16 #include <linux/sched.h>
  17 #include <linux/timer.h>
  18 #include <linux/interrupt.h>
  19 #include <asm/io.h>
  20 #include <asm/byteorder.h>
  21 #include <asm/uaccess.h>
  22
  23 #include <linux/atmdev.h>
  24 #include <linux/atm.h>
  25 #include <linux/sonet.h>
  26
  27 /* version definition */
  28
  29 #define DRV_VERSION "1.0"
  30
  31 #define DEV_LABEL "adummy"
  32
  33 #define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data)
  34
  35 struct adummy_dev {
  36         struct atm_dev *atm_dev;
  37
  38         struct list_head entry;
  39 };
  40
  41 /* globals */
  42
  43 static LIST_HEAD(adummy_devs);
  44
  45 static int __init
  46 adummy_start(struct atm_dev *dev)
  47 {
  48         dev->ci_range.vpi_bits = 4;
  49         dev->ci_range.vci_bits = 12;
  50
  51         return 0;
  52 }
  53
  54 static int
  55 adummy_open(struct atm_vcc *vcc)
  56 {
  57         short vpi = vcc->vpi;
  58         int vci = vcc->vci;
  59
  60         if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC)
  61                 return 0;
  62
  63         set_bit(ATM_VF_ADDR, &vcc->flags);
  64         set_bit(ATM_VF_READY, &vcc->flags);
  65
  66         return 0;
  67 }
  68
  69 static void
  70 adummy_close(struct atm_vcc *vcc)
  71 {
  72         clear_bit(ATM_VF_READY, &vcc->flags);
  73         clear_bit(ATM_VF_ADDR, &vcc->flags);
  74 }
  75
  76 static int
  77 adummy_send(struct atm_vcc *vcc, struct sk_buff *skb)
  78 {
  79         if (vcc->pop)
  80                 vcc->pop(vcc, skb);
  81         else
  82                 dev_kfree_skb_any(skb);
  83         atomic_inc(&vcc->stats->tx);
  84
  85         return 0;
  86 }
  87
  88 static int
  89 adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page)
  90 {
  91         int left = *pos;
  92
  93         if (!left--)
  94                 return sprintf(page, "version %s\n", DRV_VERSION);
  95
  96         return 0;
  97 }
  98
  99 static struct atmdev_ops adummy_ops =
 100 {
 101         .open =         adummy_open,
 102         .close =        adummy_close,
 103         .send =         adummy_send,
 104         .proc_read =    adummy_proc_read,
 105         .owner =        THIS_MODULE
 106 };
 107
 108 static int __init adummy_init(void)
 109 {
 110         struct atm_dev *atm_dev;
 111         struct adummy_dev *adummy_dev;
 112         int err = 0;
 113
 114         printk(KERN_ERR "adummy: version %s\n", DRV_VERSION);
 115
 116         adummy_dev = (struct adummy_dev *) kmalloc(sizeof(struct adummy_dev),
 117                                                    GFP_KERNEL);
 118         if (!adummy_dev) {
 119                 printk(KERN_ERR DEV_LABEL ": kmalloc() failed\n");
 120                 err = -ENOMEM;
 121                 goto out;
 122         }
 123         memset(adummy_dev, 0, sizeof(struct adummy_dev));
 124
 125         atm_dev = atm_dev_register(DEV_LABEL, &adummy_ops, -1, NULL);
 126         if (!atm_dev) {
 127                 printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n");
 128                 err = -ENODEV;
 129                 goto out_kfree;
 130         }
 131
 132         adummy_dev->atm_dev = atm_dev;
 133         atm_dev->dev_data = adummy_dev;
 134
 135         if (adummy_start(atm_dev)) {
 136                 printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n");
 137                 err = -ENODEV;
 138                 goto out_unregister;
 139         }
 140
 141         list_add(&adummy_dev->entry, &adummy_devs);
 142 out:
 143         return err;
 144
 145 out_unregister:
 146         atm_dev_deregister(atm_dev);
 147 out_kfree:
 148         kfree(adummy_dev);
 149         goto out;
 150 }
 151
 152 static void __exit adummy_cleanup(void)
 153 {
 154         struct adummy_dev *adummy_dev, *next;
 155
 156         list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) {
 157                 atm_dev_deregister(adummy_dev->atm_dev);
 158                 kfree(adummy_dev);
 159         }
 160 }
 161
 162 module_init(adummy_init);
 163 module_exit(adummy_cleanup);
 164
 165 MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>");
 166 MODULE_DESCRIPTION("dummy ATM driver");
 167 MODULE_LICENSE("GPL");