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"); 169