// SPDX-License-Identifier: GPL-2.0
/* 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 type_show(struct device *cdev,
                         struct device_attribute *attr, char *buf)
{
        struct atm_dev *adev = to_atm_dev(cdev);

        return scnprintf(buf, PAGE_SIZE, "%s\n", adev->type);
}

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

        return scnprintf(buf, PAGE_SIZE, "%pM\n", adev->esi);
}

static ssize_t atmaddress_show(struct device *cdev,
                               struct device_attribute *attr, char *buf)
{
        unsigned long flags;
        struct atm_dev *adev = to_atm_dev(cdev);
        struct atm_dev_addr *aaddr;
        int count = 0;

        spin_lock_irqsave(&adev->lock, flags);
        list_for_each_entry(aaddr, &adev->local, entry) {
                count += scnprintf(buf + count, PAGE_SIZE - count,
                                   "%1phN.%2phN.%10phN.%6phN.%1phN\n",
                                   &aaddr->addr.sas_addr.prv[0],
                                   &aaddr->addr.sas_addr.prv[1],
                                   &aaddr->addr.sas_addr.prv[3],
                                   &aaddr->addr.sas_addr.prv[13],
                                   &aaddr->addr.sas_addr.prv[19]);
        }
        spin_unlock_irqrestore(&adev->lock, flags);

        return count;
}

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

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

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

        return scnprintf(buf, PAGE_SIZE, "%d\n",
                         adev->signal == ATM_PHY_SIG_LOST ? 0 : 1);
}

static ssize_t link_rate_show(struct device *cdev,
                              struct device_attribute *attr, char *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;
        }
        return scnprintf(buf, PAGE_SIZE, "%d\n", link_rate);
}

static DEVICE_ATTR_RO(address);
static DEVICE_ATTR_RO(atmaddress);
static DEVICE_ATTR_RO(atmindex);
static DEVICE_ATTR_RO(carrier);
static DEVICE_ATTR_RO(type);
static DEVICE_ATTR_RO(link_rate);

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(const struct device *cdev, struct kobj_uevent_env *env)
{
        const struct atm_dev *adev;

        if (!cdev)
                return -ENODEV;

        adev = to_atm_dev(cdev);

        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);
}