drivers/atm/adummy.c

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