/*

   * hsr_debugfs code

   * Copyright (C) 2019 Texas Instruments Incorporated

   *
   * Author(s):

   *	Murali Karicheri <m-karicheri2@ti.com>

   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation version 2.
   *
   * This program is distributed "as is" WITHOUT ANY WARRANTY of any
   * kind, whether express or implied; without even the implied warranty
   * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   */
  #include <linux/module.h>
  #include <linux/errno.h>
  #include <linux/debugfs.h>
  #include "hsr_main.h"
  #include "hsr_framereg.h"

  static struct dentry *hsr_debugfs_root_dir;

  static void print_mac_address(struct seq_file *sfp, unsigned char *mac)
  {
  	seq_printf(sfp, "%02x:%02x:%02x:%02x:%02x:%02x:",
  		   mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
  }

  /* hsr_node_table_show - Formats and prints node_table entries */

  static int

  hsr_node_table_show(struct seq_file *sfp, void *data)

  {
  	struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
  	struct hsr_node *node;
  
  	seq_puts(sfp, "Node Table entries
  ");
  	seq_puts(sfp, "MAC-Address-A,   MAC-Address-B, time_in[A], ");
  	seq_puts(sfp, "time_in[B], Address-B port
  ");
  	rcu_read_lock();
  	list_for_each_entry_rcu(node, &priv->node_db, mac_list) {
  		/* skip self node */
  		if (hsr_addr_is_self(priv, node->macaddress_A))
  			continue;
  		print_mac_address(sfp, &node->macaddress_A[0]);
  		seq_puts(sfp, " ");
  		print_mac_address(sfp, &node->macaddress_B[0]);
  		seq_printf(sfp, "0x%lx, ", node->time_in[HSR_PT_SLAVE_A]);
  		seq_printf(sfp, "0x%lx ", node->time_in[HSR_PT_SLAVE_B]);
  		seq_printf(sfp, "0x%x
  ", node->addr_B_port);
  	}
  	rcu_read_unlock();
  	return 0;
  }

  /* hsr_node_table_open - Open the node_table file

   *
   * Description:
   * This routine opens a debugfs file node_table of specific hsr device
   */
  static int

  hsr_node_table_open(struct inode *inode, struct file *filp)

  {

  	return single_open(filp, hsr_node_table_show, inode->i_private);

  }

  void hsr_debugfs_rename(struct net_device *dev)
  {
  	struct hsr_priv *priv = netdev_priv(dev);
  	struct dentry *d;
  
  	d = debugfs_rename(hsr_debugfs_root_dir, priv->node_tbl_root,
  			   hsr_debugfs_root_dir, dev->name);
  	if (IS_ERR(d))
  		netdev_warn(dev, "failed to rename
  ");
  	else
  		priv->node_tbl_root = d;
  }

  static const struct file_operations hsr_fops = {

  	.open	= hsr_node_table_open,

  	.read	= seq_read,
  	.llseek = seq_lseek,
  	.release = single_release,
  };

  /* hsr_debugfs_init - create hsr node_table file for dumping

   * the node table
   *
   * Description:
   * When debugfs is configured this routine sets up the node_table file per

   * hsr device for dumping the node_table entries

   */

  void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)

  {

  	struct dentry *de = NULL;

  	de = debugfs_create_dir(hsr_dev->name, hsr_debugfs_root_dir);

  	if (IS_ERR(de)) {

  		pr_err("Cannot create hsr debugfs directory
  ");

  		return;

  	}
  
  	priv->node_tbl_root = de;
  
  	de = debugfs_create_file("node_table", S_IFREG | 0444,
  				 priv->node_tbl_root, priv,

  				 &hsr_fops);

  	if (IS_ERR(de)) {

  		pr_err("Cannot create hsr node_table file
  ");

  		debugfs_remove(priv->node_tbl_root);
  		priv->node_tbl_root = NULL;
  		return;

  	}
  	priv->node_tbl_file = de;

  }

  /* hsr_debugfs_term - Tear down debugfs intrastructure

   *
   * Description:
   * When Debufs is configured this routine removes debugfs file system

   * elements that are specific to hsr

   */
  void

  hsr_debugfs_term(struct hsr_priv *priv)

  {
  	debugfs_remove(priv->node_tbl_file);
  	priv->node_tbl_file = NULL;
  	debugfs_remove(priv->node_tbl_root);
  	priv->node_tbl_root = NULL;
  }

  
  void hsr_debugfs_create_root(void)
  {
  	hsr_debugfs_root_dir = debugfs_create_dir("hsr", NULL);
  	if (IS_ERR(hsr_debugfs_root_dir)) {
  		pr_err("Cannot create hsr debugfs root directory
  ");
  		hsr_debugfs_root_dir = NULL;
  	}
  }
  
  void hsr_debugfs_remove_root(void)
  {
  	/* debugfs_remove() internally checks NULL and ERROR */
  	debugfs_remove(hsr_debugfs_root_dir);
  }