1fb296449SChas Williams /* 2fb296449SChas Williams * adummy.c: a dummy ATM driver 3fb296449SChas Williams */ 4fb296449SChas Williams 5fb296449SChas Williams #include <linux/module.h> 6fb296449SChas Williams #include <linux/kernel.h> 7fb296449SChas Williams #include <linux/skbuff.h> 8fb296449SChas Williams #include <linux/errno.h> 9fb296449SChas Williams #include <linux/types.h> 10fb296449SChas Williams #include <linux/string.h> 11fb296449SChas Williams #include <linux/delay.h> 12fb296449SChas Williams #include <linux/init.h> 13fb296449SChas Williams #include <linux/mm.h> 14fb296449SChas Williams #include <linux/timer.h> 15fb296449SChas Williams #include <linux/interrupt.h> 165a0e3ad6STejun Heo #include <linux/slab.h> 17fb296449SChas Williams #include <asm/io.h> 18fb296449SChas Williams #include <asm/byteorder.h> 19fb296449SChas Williams #include <asm/uaccess.h> 20fb296449SChas Williams 21fb296449SChas Williams #include <linux/atmdev.h> 22fb296449SChas Williams #include <linux/atm.h> 23fb296449SChas Williams #include <linux/sonet.h> 24fb296449SChas Williams 25fb296449SChas Williams /* version definition */ 26fb296449SChas Williams 27fb296449SChas Williams #define DRV_VERSION "1.0" 28fb296449SChas Williams 29fb296449SChas Williams #define DEV_LABEL "adummy" 30fb296449SChas Williams 31fb296449SChas Williams #define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data) 32fb296449SChas Williams 33fb296449SChas Williams struct adummy_dev { 34fb296449SChas Williams struct atm_dev *atm_dev; 35fb296449SChas Williams 36fb296449SChas Williams struct list_head entry; 37fb296449SChas Williams }; 38fb296449SChas Williams 39fb296449SChas Williams /* globals */ 40fb296449SChas Williams 41fb296449SChas Williams static LIST_HEAD(adummy_devs); 42fb296449SChas Williams 43fb296449SChas Williams static int __init 44fb296449SChas Williams adummy_start(struct atm_dev *dev) 45fb296449SChas Williams { 46fb296449SChas Williams dev->ci_range.vpi_bits = 4; 47fb296449SChas Williams dev->ci_range.vci_bits = 12; 48fb296449SChas Williams 49fb296449SChas Williams return 0; 50fb296449SChas Williams } 51fb296449SChas Williams 52fb296449SChas Williams static int 53fb296449SChas Williams adummy_open(struct atm_vcc *vcc) 54fb296449SChas Williams { 55fb296449SChas Williams short vpi = vcc->vpi; 56fb296449SChas Williams int vci = vcc->vci; 57fb296449SChas Williams 58fb296449SChas Williams if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC) 59fb296449SChas Williams return 0; 60fb296449SChas Williams 61fb296449SChas Williams set_bit(ATM_VF_ADDR, &vcc->flags); 62fb296449SChas Williams set_bit(ATM_VF_READY, &vcc->flags); 63fb296449SChas Williams 64fb296449SChas Williams return 0; 65fb296449SChas Williams } 66fb296449SChas Williams 67fb296449SChas Williams static void 68fb296449SChas Williams adummy_close(struct atm_vcc *vcc) 69fb296449SChas Williams { 70fb296449SChas Williams clear_bit(ATM_VF_READY, &vcc->flags); 71fb296449SChas Williams clear_bit(ATM_VF_ADDR, &vcc->flags); 72fb296449SChas Williams } 73fb296449SChas Williams 74fb296449SChas Williams static int 75fb296449SChas Williams adummy_send(struct atm_vcc *vcc, struct sk_buff *skb) 76fb296449SChas Williams { 77fb296449SChas Williams if (vcc->pop) 78fb296449SChas Williams vcc->pop(vcc, skb); 79fb296449SChas Williams else 80fb296449SChas Williams dev_kfree_skb_any(skb); 81fb296449SChas Williams atomic_inc(&vcc->stats->tx); 82fb296449SChas Williams 83fb296449SChas Williams return 0; 84fb296449SChas Williams } 85fb296449SChas Williams 86fb296449SChas Williams static int 87fb296449SChas Williams adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page) 88fb296449SChas Williams { 89fb296449SChas Williams int left = *pos; 90fb296449SChas Williams 91fb296449SChas Williams if (!left--) 92fb296449SChas Williams return sprintf(page, "version %s\n", DRV_VERSION); 93fb296449SChas Williams 94fb296449SChas Williams return 0; 95fb296449SChas Williams } 96fb296449SChas Williams 97fb296449SChas Williams static struct atmdev_ops adummy_ops = 98fb296449SChas Williams { 99fb296449SChas Williams .open = adummy_open, 100fb296449SChas Williams .close = adummy_close, 101fb296449SChas Williams .send = adummy_send, 102fb296449SChas Williams .proc_read = adummy_proc_read, 103fb296449SChas Williams .owner = THIS_MODULE 104fb296449SChas Williams }; 105fb296449SChas Williams 106fb296449SChas Williams static int __init adummy_init(void) 107fb296449SChas Williams { 108fb296449SChas Williams struct atm_dev *atm_dev; 109fb296449SChas Williams struct adummy_dev *adummy_dev; 110fb296449SChas Williams int err = 0; 111fb296449SChas Williams 112fb296449SChas Williams printk(KERN_ERR "adummy: version %s\n", DRV_VERSION); 113fb296449SChas Williams 1140c1cca1dSOm Narasimhan adummy_dev = kzalloc(sizeof(struct adummy_dev), 115fb296449SChas Williams GFP_KERNEL); 116fb296449SChas Williams if (!adummy_dev) { 1170c1cca1dSOm Narasimhan printk(KERN_ERR DEV_LABEL ": kzalloc() failed\n"); 118fb296449SChas Williams err = -ENOMEM; 119fb296449SChas Williams goto out; 120fb296449SChas Williams } 1217877327dSAl Viro atm_dev = atm_dev_register(DEV_LABEL, &adummy_ops, -1, NULL); 122fb296449SChas Williams if (!atm_dev) { 123fb296449SChas Williams printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n"); 124fb296449SChas Williams err = -ENODEV; 125fb296449SChas Williams goto out_kfree; 126fb296449SChas Williams } 127fb296449SChas Williams 128fb296449SChas Williams adummy_dev->atm_dev = atm_dev; 129fb296449SChas Williams atm_dev->dev_data = adummy_dev; 130fb296449SChas Williams 131fb296449SChas Williams if (adummy_start(atm_dev)) { 132fb296449SChas Williams printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n"); 133fb296449SChas Williams err = -ENODEV; 134fb296449SChas Williams goto out_unregister; 135fb296449SChas Williams } 136fb296449SChas Williams 137fb296449SChas Williams list_add(&adummy_dev->entry, &adummy_devs); 138fb296449SChas Williams out: 139fb296449SChas Williams return err; 140fb296449SChas Williams 141fb296449SChas Williams out_unregister: 142fb296449SChas Williams atm_dev_deregister(atm_dev); 143fb296449SChas Williams out_kfree: 144fb296449SChas Williams kfree(adummy_dev); 145fb296449SChas Williams goto out; 146fb296449SChas Williams } 147fb296449SChas Williams 148fb296449SChas Williams static void __exit adummy_cleanup(void) 149fb296449SChas Williams { 150fb296449SChas Williams struct adummy_dev *adummy_dev, *next; 151fb296449SChas Williams 152fb296449SChas Williams list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) { 153fb296449SChas Williams atm_dev_deregister(adummy_dev->atm_dev); 154fb296449SChas Williams kfree(adummy_dev); 155fb296449SChas Williams } 156fb296449SChas Williams } 157fb296449SChas Williams 158fb296449SChas Williams module_init(adummy_init); 159fb296449SChas Williams module_exit(adummy_cleanup); 160fb296449SChas Williams 161fb296449SChas Williams MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>"); 162fb296449SChas Williams MODULE_DESCRIPTION("dummy ATM driver"); 163fb296449SChas Williams MODULE_LICENSE("GPL"); 164