diff options
Diffstat (limited to 'drivers/atm/adummy.c')
| -rw-r--r-- | drivers/atm/adummy.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/drivers/atm/adummy.c b/drivers/atm/adummy.c new file mode 100644 index 000000000..8157925af --- /dev/null +++ b/drivers/atm/adummy.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * adummy.c: a dummy ATM driver + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/skbuff.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/timer.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <asm/io.h> +#include <asm/byteorder.h> +#include <linux/uaccess.h> + +#include <linux/atmdev.h> +#include <linux/atm.h> +#include <linux/sonet.h> + +/* version definition */ + +#define DRV_VERSION "1.0" + +#define DEV_LABEL "adummy" + +#define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data) + +struct adummy_dev { + struct atm_dev *atm_dev; + + struct list_head entry; +}; + +/* globals */ + +static LIST_HEAD(adummy_devs); + +static ssize_t __set_signal(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev); + int signal; + + if (sscanf(buf, "%d", &signal) == 1) { + + if (signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND) + signal = ATM_PHY_SIG_UNKNOWN; + + atm_dev_signal_change(atm_dev, signal); + return 1; + } + return -EINVAL; +} + +static ssize_t __show_signal(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev); + return sprintf(buf, "%d\n", atm_dev->signal); +} +static DEVICE_ATTR(signal, 0644, __show_signal, __set_signal); + +static struct attribute *adummy_attrs[] = { + &dev_attr_signal.attr, + NULL +}; + +static const struct attribute_group adummy_group_attrs = { + .name = NULL, /* We want them in dev's root folder */ + .attrs = adummy_attrs +}; + +static int __init +adummy_start(struct atm_dev *dev) +{ + dev->ci_range.vpi_bits = 4; + dev->ci_range.vci_bits = 12; + + return 0; +} + +static int +adummy_open(struct atm_vcc *vcc) +{ + short vpi = vcc->vpi; + int vci = vcc->vci; + + if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC) + return 0; + + set_bit(ATM_VF_ADDR, &vcc->flags); + set_bit(ATM_VF_READY, &vcc->flags); + + return 0; +} + +static void +adummy_close(struct atm_vcc *vcc) +{ + clear_bit(ATM_VF_READY, &vcc->flags); + clear_bit(ATM_VF_ADDR, &vcc->flags); +} + +static int +adummy_send(struct atm_vcc *vcc, struct sk_buff *skb) +{ + if (vcc->pop) + vcc->pop(vcc, skb); + else + dev_kfree_skb_any(skb); + atomic_inc(&vcc->stats->tx); + + return 0; +} + +static int +adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page) +{ + int left = *pos; + + if (!left--) + return sprintf(page, "version %s\n", DRV_VERSION); + + return 0; +} + +static const struct atmdev_ops adummy_ops = +{ + .open = adummy_open, + .close = adummy_close, + .send = adummy_send, + .proc_read = adummy_proc_read, + .owner = THIS_MODULE +}; + +static int __init adummy_init(void) +{ + struct atm_dev *atm_dev; + struct adummy_dev *adummy_dev; + int err = 0; + + printk(KERN_ERR "adummy: version %s\n", DRV_VERSION); + + adummy_dev = kzalloc(sizeof(struct adummy_dev), + GFP_KERNEL); + if (!adummy_dev) { + printk(KERN_ERR DEV_LABEL ": kzalloc() failed\n"); + err = -ENOMEM; + goto out; + } + atm_dev = atm_dev_register(DEV_LABEL, NULL, &adummy_ops, -1, NULL); + if (!atm_dev) { + printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n"); + err = -ENODEV; + goto out_kfree; + } + + adummy_dev->atm_dev = atm_dev; + atm_dev->dev_data = adummy_dev; + + if (sysfs_create_group(&atm_dev->class_dev.kobj, &adummy_group_attrs)) + dev_err(&atm_dev->class_dev, "Could not register attrs for adummy\n"); + + if (adummy_start(atm_dev)) { + printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n"); + err = -ENODEV; + goto out_unregister; + } + + list_add(&adummy_dev->entry, &adummy_devs); +out: + return err; + +out_unregister: + atm_dev_deregister(atm_dev); +out_kfree: + kfree(adummy_dev); + goto out; +} + +static void __exit adummy_cleanup(void) +{ + struct adummy_dev *adummy_dev, *next; + + list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) { + atm_dev_deregister(adummy_dev->atm_dev); + kfree(adummy_dev); + } +} + +module_init(adummy_init); +module_exit(adummy_cleanup); + +MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>"); +MODULE_DESCRIPTION("dummy ATM driver"); +MODULE_LICENSE("GPL"); |