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