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