/*
<:copyright-BRCM:2020:DUAL/GPL:standard

   Copyright (c) 2020 Broadcom 
   All Rights Reserved

Unless you and Broadcom execute a separate written software license
agreement governing use of this software, this software is licensed
to you under the terms of the GNU General Public License version 2
(the "GPL"), available at http://www.broadcom.com/licenses/GPLv2.php,
with the following added to such license:

   As a special exception, the copyright holders of this software give
   you permission to link this software with independent modules, and
   to copy and distribute the resulting executable under terms of your
   choice, provided that you also meet, for each linked independent
   module, the terms and conditions of the license of that module.
   An independent module is a module which is not derived from this
   software.  The special exception does not apply to any modifications
   of the software.

Not withstanding the above, under no circumstances may you combine
this software in any way with any other Broadcom software provided
under a license other than the GPL, without Broadcom's express prior
written consent.

:>
*/

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include "bcm_mcast_priv.h"

ssize_t bcm_mcastrouter_show(struct device *d, struct device_attribute *attr,
                             char *buf)
{
    struct net_device *dev_p = to_net_dev(d);

    return sprintf(buf, "%d\n", is_netdev_mcastrouter(dev_p) ? 1 : 0);
}

ssize_t bcm_mcastrouter_store(struct device *d, struct device_attribute *attr,
                              const char *buf, size_t count)
{
    struct net_device *dev_p = to_net_dev(d);
    int val;

    sscanf(buf, "%du", &val);

    if ( val )
    {
        netdev_mcastrouter_set(dev_p);
    }
    else
    {
        netdev_mcastrouter_unset(dev_p);
    }
    return count;
}

static struct device_attribute  bcm_mcastrouter_attribute = __ATTR(bcm_mcastrouter,
                                                                   0660,
                                                                   bcm_mcastrouter_show,
                                                                   bcm_mcastrouter_store);

void bcm_mcast_print_sysfs_file_path(struct net_device *dev)
{
    struct kobject *devkobj = &dev->dev.kobj;
    struct kernfs_node *parent;
    char *buf;

    parent = devkobj->parent->sd;

    buf = kzalloc(PATH_MAX, GFP_KERNEL);
    if (buf)
    {
        kernfs_path(parent, buf, PATH_MAX);

        bcm_printk("*** dev %s bcm_mcastrouter file path %s/%s ***\n", 
               dev->name, buf, kobject_name(devkobj) );

        kfree(buf);
    }
}

void bcm_mcast_sysfs_create_file(struct net_device *dev)
{
    struct kobject *devkobj = &dev->dev.kobj;
    int error;

    /*  The bcm_mcastrouter file is normally located in one of the following paths. 
        /sys/devices/virtual/net/<dev>
        /sys/devices/platform/80040000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/net/<wl dev>
        Enable the following function to print the sysfs path for the device if the device
        cannot be located in one of the above paths */
    // bcm_mcast_print_sysfs_file_path(dev);

    error = sysfs_create_file(devkobj, &bcm_mcastrouter_attribute.attr);
    if (error) 
    {
        __logError("failed to create the bcm_mcastrouter file for dev", dev->name);
    }
}

void bcm_mcast_sysfs_remove_file(struct net_device *dev)
{
    struct kobject *devkobj = &dev->dev.kobj;

    sysfs_remove_file(devkobj, &bcm_mcastrouter_attribute.attr);
}