atm_sysfs.c

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/* ATM driver model support. */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kobject.h>
#include <linux/atmdev.h>
#include "common.h"
#include "resources.h"

#define to_atm_dev(cldev) container_of(cldev, struct atm_dev, class_dev)

static ssize_t show_type(struct device *cdev,
             struct device_attribute *attr, char *buf)
{
    struct atm_dev *adev = to_atm_dev(cdev);
    return sprintf(buf, "%s\n", adev->type);
}

static ssize_t show_address(struct device *cdev,
                struct device_attribute *attr, char *buf)
{
    char *pos = buf;
    struct atm_dev *adev = to_atm_dev(cdev);
    int i;

    for (i = 0; i < (ESI_LEN - 1); i++)
        pos += sprintf(pos, "%02x:", adev->esi[i]);
    pos += sprintf(pos, "%02x\n", adev->esi[i]);

    return pos - buf;
}

static ssize_t show_atmaddress(struct device *cdev,
                   struct device_attribute *attr, char *buf)
{
    unsigned long flags;
    char *pos = buf;
    struct atm_dev *adev = to_atm_dev(cdev);
    struct atm_dev_addr *aaddr;
    int bin[] = { 1, 2, 10, 6, 1 }, *fmt = bin;
    int i, j;

    spin_lock_irqsave(&adev->lock, flags);
    list_for_each_entry(aaddr, &adev->local, entry) {
        for (i = 0, j = 0; i < ATM_ESA_LEN; ++i, ++j) {
            if (j == *fmt) {
                pos += sprintf(pos, ".");
                ++fmt;
                j = 0;
            }
            pos += sprintf(pos, "%02x",
                       aaddr->addr.sas_addr.prv[i]);
        }
        pos += sprintf(pos, "\n");
    }
    spin_unlock_irqrestore(&adev->lock, flags);

    return pos - buf;
}

static ssize_t show_atmindex(struct device *cdev,
                 struct device_attribute *attr, char *buf)
{
    struct atm_dev *adev = to_atm_dev(cdev);

    return sprintf(buf, "%d\n", adev->number);
}

static ssize_t show_carrier(struct device *cdev,
                struct device_attribute *attr, char *buf)
{
    char *pos = buf;
    struct atm_dev *adev = to_atm_dev(cdev);

    pos += sprintf(pos, "%d\n",
               adev->signal == ATM_PHY_SIG_LOST ? 0 : 1);

    return pos - buf;
}

static ssize_t show_link_rate(struct device *cdev,
                  struct device_attribute *attr, char *buf)
{
    char *pos = buf;
    struct atm_dev *adev = to_atm_dev(cdev);
    int link_rate;

    /* show the link rate, not the data rate */
    switch (adev->link_rate) {
    case ATM_OC3_PCR:
        link_rate = 155520000;
        break;
    case ATM_OC12_PCR:
        link_rate = 622080000;
        break;
    case ATM_25_PCR:
        link_rate = 25600000;
        break;
    default:
        link_rate = adev->link_rate * 8 * 53;
    }
    pos += sprintf(pos, "%d\n", link_rate);

    return pos - buf;
}

static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
static DEVICE_ATTR(atmaddress, S_IRUGO, show_atmaddress, NULL);
static DEVICE_ATTR(atmindex, S_IRUGO, show_atmindex, NULL);
static DEVICE_ATTR(carrier, S_IRUGO, show_carrier, NULL);
static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
static DEVICE_ATTR(link_rate, S_IRUGO, show_link_rate, NULL);

static struct device_attribute *atm_attrs[] = {
    &dev_attr_atmaddress,
    &dev_attr_address,
    &dev_attr_atmindex,
    &dev_attr_carrier,
    &dev_attr_type,
    &dev_attr_link_rate,
    NULL
};


static int atm_uevent(struct device *cdev, struct kobj_uevent_env *env)
{
    struct atm_dev *adev;

    if (!cdev)
        return -ENODEV;

    adev = to_atm_dev(cdev);
    if (!adev)
        return -ENODEV;

    if (add_uevent_var(env, "NAME=%s%d", adev->type, adev->number))
        return -ENOMEM;

    return 0;
}

static void atm_release(struct device *cdev)
{
    struct atm_dev *adev = to_atm_dev(cdev);

    kfree(adev);
}

static struct class atm_class = {
    .name       = "atm",
    .dev_release    = atm_release,
    .dev_uevent     = atm_uevent,
};

int atm_register_sysfs(struct atm_dev *adev, struct device *parent)
{
    struct device *cdev = &adev->class_dev;
    int i, j, err;

    cdev->class = &atm_class;
    cdev->parent = parent;
    dev_set_drvdata(cdev, adev);

    dev_set_name(cdev, "%s%d", adev->type, adev->number);
    err = device_register(cdev);
    if (err < 0)
        return err;

    for (i = 0; atm_attrs[i]; i++) {
        err = device_create_file(cdev, atm_attrs[i]);
        if (err)
            goto err_out;
    }

    return 0;

err_out:
    for (j = 0; j < i; j++)
        device_remove_file(cdev, atm_attrs[j]);
    device_del(cdev);
    return err;
}

void atm_unregister_sysfs(struct atm_dev *adev)
{
    struct device *cdev = &adev->class_dev;

    device_del(cdev);
}

int __init atm_sysfs_init(void)
{
    return class_register(&atm_class);
}

void __exit atm_sysfs_exit(void)
{
    class_unregister(&atm_class);
}