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"); 165