drivers/uwb/uwb-debug.c - arm/linux - Git at Google

 /*
  * Ultra Wide Band
  * Debug support
  *
  * Copyright (C) 2005-2006 Intel Corporation
  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version
  * 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
  *
  *
  * FIXME: doc
  */

 #include <linux/spinlock.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/notifier.h>
 #include <linux/device.h>
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/seq_file.h>

 #include <linux/uwb/debug-cmd.h>

 #include "uwb-internal.h"

 /*
  * Debug interface
  *
  * Per radio controller debugfs files (in uwb/uwbN/):
  *
  * command: Flexible command interface (see <linux/uwb/debug-cmd.h>).
  *
  * reservations: information on reservations.
  *
  * accept: Set to true (Y or 1) to accept reservation requests from
  * peers.
  *
  * drp_avail: DRP availability information.
  */

 struct uwb_dbg {
 	struct uwb_pal pal;

 	bool accept;
 	struct list_head rsvs;

 	struct dentry *root_d;
 	struct dentry *command_f;
 	struct dentry *reservations_f;
 	struct dentry *accept_f;
 	struct dentry *drp_avail_f;
 	spinlock_t list_lock;
 };

 static struct dentry *root_dir;

 static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
 {
 	struct uwb_dbg *dbg = rsv->pal_priv;

 	uwb_rsv_dump("debug", rsv);

 	if (rsv->state == UWB_RSV_STATE_NONE) {
 		spin_lock(&dbg->list_lock);
 		list_del(&rsv->pal_node);
 		spin_unlock(&dbg->list_lock);
 		uwb_rsv_destroy(rsv);
 	}
 }

 static int cmd_rsv_establish(struct uwb_rc *rc,
 			     struct uwb_dbg_cmd_rsv_establish *cmd)
 {
 	struct uwb_mac_addr macaddr;
 	struct uwb_rsv *rsv;
 	struct uwb_dev *target;
 	int ret;

 	memcpy(&macaddr, cmd->target, sizeof(macaddr));
 	target = uwb_dev_get_by_macaddr(rc, &macaddr);
 	if (target == NULL)
 		return -ENODEV;

 	rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, rc->dbg);
 	if (rsv == NULL) {
 		uwb_dev_put(target);
 		return -ENOMEM;
 	}

 	rsv->target.type  = UWB_RSV_TARGET_DEV;
 	rsv->target.dev   = target;
 	rsv->type         = cmd->type;
 	rsv->max_mas      = cmd->max_mas;
 	rsv->min_mas      = cmd->min_mas;
 	rsv->max_interval = cmd->max_interval;

 	ret = uwb_rsv_establish(rsv);
 	if (ret)
 		uwb_rsv_destroy(rsv);
 	else {
 		spin_lock(&(rc->dbg)->list_lock);
 		list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
 		spin_unlock(&(rc->dbg)->list_lock);
 	}
 	return ret;
 }

 static int cmd_rsv_terminate(struct uwb_rc *rc,
 			     struct uwb_dbg_cmd_rsv_terminate *cmd)
 {
 	struct uwb_rsv *rsv, *found = NULL;
 	int i = 0;

 	spin_lock(&(rc->dbg)->list_lock);

 	list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
 		if (i == cmd->index) {
 			found = rsv;
 			uwb_rsv_get(found);
 			break;
 		}
 		i++;
 	}

 	spin_unlock(&(rc->dbg)->list_lock);

 	if (!found)
 		return -EINVAL;

 	uwb_rsv_terminate(found);
 	uwb_rsv_put(found);

 	return 0;
 }

 static int cmd_ie_add(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_add)
 {
 	return uwb_rc_ie_add(rc,
 			     (const struct uwb_ie_hdr *) ie_to_add->data,
 			     ie_to_add->len);
 }

 static int cmd_ie_rm(struct uwb_rc *rc, struct uwb_dbg_cmd_ie *ie_to_rm)
 {
 	return uwb_rc_ie_rm(rc, ie_to_rm->data[0]);
 }

 static ssize_t command_write(struct file *file, const char __user *buf,
 			 size_t len, loff_t *off)
 {
 	struct uwb_rc *rc = file->private_data;
 	struct uwb_dbg_cmd cmd;
 	int ret = 0;

 	if (len != sizeof(struct uwb_dbg_cmd))
 		return -EINVAL;

 	if (copy_from_user(&cmd, buf, len) != 0)
 		return -EFAULT;

 	switch (cmd.type) {
 	case UWB_DBG_CMD_RSV_ESTABLISH:
 		ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
 		break;
 	case UWB_DBG_CMD_RSV_TERMINATE:
 		ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
 		break;
 	case UWB_DBG_CMD_IE_ADD:
 		ret = cmd_ie_add(rc, &cmd.ie_add);
 		break;
 	case UWB_DBG_CMD_IE_RM:
 		ret = cmd_ie_rm(rc, &cmd.ie_rm);
 		break;
 	case UWB_DBG_CMD_RADIO_START:
 		ret = uwb_radio_start(&rc->dbg->pal);
 		break;
 	case UWB_DBG_CMD_RADIO_STOP:
 		uwb_radio_stop(&rc->dbg->pal);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return ret < 0 ? ret : len;
 }

 static const struct file_operations command_fops = {
 	.open	= simple_open,
 	.write  = command_write,
 	.read   = NULL,
 	.llseek = no_llseek,
 	.owner  = THIS_MODULE,
 };

 static int reservations_print(struct seq_file *s, void *p)
 {
 	struct uwb_rc *rc = s->private;
 	struct uwb_rsv *rsv;

 	mutex_lock(&rc->rsvs_mutex);

 	list_for_each_entry(rsv, &rc->reservations, rc_node) {
 		struct uwb_dev_addr devaddr;
 		char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
 		bool is_owner;

 		uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
 		if (rsv->target.type == UWB_RSV_TARGET_DEV) {
 			devaddr = rsv->target.dev->dev_addr;
 			is_owner = &rc->uwb_dev == rsv->owner;
 		} else {
 			devaddr = rsv->target.devaddr;
 			is_owner = true;
 		}
 		uwb_dev_addr_print(target, sizeof(target), &devaddr);

 		seq_printf(s, "%c %s -> %s: %s\n",
 			   is_owner ? 'O' : 'T',
 			   owner, target, uwb_rsv_state_str(rsv->state));
 		seq_printf(s, "  stream: %d  type: %s\n",
 			   rsv->stream, uwb_rsv_type_str(rsv->type));
 		seq_printf(s, "  %*pb\n", UWB_NUM_MAS, rsv->mas.bm);
 	}

 	mutex_unlock(&rc->rsvs_mutex);

 	return 0;
 }

 static int reservations_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, reservations_print, inode->i_private);
 }

 static const struct file_operations reservations_fops = {
 	.open    = reservations_open,
 	.read    = seq_read,
 	.llseek  = seq_lseek,
 	.release = single_release,
 	.owner   = THIS_MODULE,
 };

 static int drp_avail_print(struct seq_file *s, void *p)
 {
 	struct uwb_rc *rc = s->private;

 	seq_printf(s, "global:  %*pb\n", UWB_NUM_MAS, rc->drp_avail.global);
 	seq_printf(s, "local:   %*pb\n", UWB_NUM_MAS, rc->drp_avail.local);
 	seq_printf(s, "pending: %*pb\n", UWB_NUM_MAS, rc->drp_avail.pending);

 	return 0;
 }

 static int drp_avail_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, drp_avail_print, inode->i_private);
 }

 static const struct file_operations drp_avail_fops = {
 	.open    = drp_avail_open,
 	.read    = seq_read,
 	.llseek  = seq_lseek,
 	.release = single_release,
 	.owner   = THIS_MODULE,
 };

 static void uwb_dbg_channel_changed(struct uwb_pal *pal, int channel)
 {
 	struct device *dev = &pal->rc->uwb_dev.dev;

 	if (channel > 0)
 		dev_info(dev, "debug: channel %d started\n", channel);
 	else
 		dev_info(dev, "debug: channel stopped\n");
 }

 static void uwb_dbg_new_rsv(struct uwb_pal *pal, struct uwb_rsv *rsv)
 {
 	struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);

 	if (dbg->accept) {
 		spin_lock(&dbg->list_lock);
 		list_add_tail(&rsv->pal_node, &dbg->rsvs);
 		spin_unlock(&dbg->list_lock);
 		uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, dbg);
 	}
 }

 /**
  * uwb_dbg_add_rc - add a debug interface for a radio controller
  * @rc: the radio controller
  */
 void uwb_dbg_add_rc(struct uwb_rc *rc)
 {
 	rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
 	if (rc->dbg == NULL)
 		return;

 	INIT_LIST_HEAD(&rc->dbg->rsvs);
 	spin_lock_init(&(rc->dbg)->list_lock);

 	uwb_pal_init(&rc->dbg->pal);
 	rc->dbg->pal.rc = rc;
 	rc->dbg->pal.channel_changed = uwb_dbg_channel_changed;
 	rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
 	uwb_pal_register(&rc->dbg->pal);

 	if (root_dir) {
 		rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
 						     root_dir);
 		rc->dbg->command_f = debugfs_create_file("command", 0200,
 							 rc->dbg->root_d, rc,
 							 &command_fops);
 		rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
 							      rc->dbg->root_d, rc,
 							      &reservations_fops);
 		rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
 							rc->dbg->root_d,
 							&rc->dbg->accept);
 		rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
 							   rc->dbg->root_d, rc,
 							   &drp_avail_fops);
 	}
 }

 /**
  * uwb_dbg_del_rc - remove a radio controller's debug interface
  * @rc: the radio controller
  */
 void uwb_dbg_del_rc(struct uwb_rc *rc)
 {
 	struct uwb_rsv *rsv, *t;

 	if (rc->dbg == NULL)
 		return;

 	list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
 		uwb_rsv_terminate(rsv);
 	}

 	uwb_pal_unregister(&rc->dbg->pal);

 	if (root_dir) {
 		debugfs_remove(rc->dbg->drp_avail_f);
 		debugfs_remove(rc->dbg->accept_f);
 		debugfs_remove(rc->dbg->reservations_f);
 		debugfs_remove(rc->dbg->command_f);
 		debugfs_remove(rc->dbg->root_d);
 	}
 }

 /**
  * uwb_dbg_exit - initialize the debug interface sub-module
  */
 void uwb_dbg_init(void)
 {
 	root_dir = debugfs_create_dir("uwb", NULL);
 }

 /**
  * uwb_dbg_exit - clean-up the debug interface sub-module
  */
 void uwb_dbg_exit(void)
 {
 	debugfs_remove(root_dir);
 }

 /**
  * uwb_dbg_create_pal_dir - create a debugfs directory for a PAL
  * @pal: The PAL.
  */
 struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal)
 {
 	struct uwb_rc *rc = pal->rc;

 	if (root_dir && rc->dbg && rc->dbg->root_d && pal->name)
 		return debugfs_create_dir(pal->name, rc->dbg->root_d);
 	return NULL;
 }
	/*
	* Ultra Wide Band
	* Debug support
	*
	* Copyright (C) 2005-2006 Intel Corporation
	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License version
	* 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*
	*
	* FIXME: doc
	*/

	#include <linux/spinlock.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/notifier.h>
	#include <linux/device.h>
	#include <linux/debugfs.h>
	#include <linux/uaccess.h>
	#include <linux/seq_file.h>

	#include <linux/uwb/debug-cmd.h>

	#include "uwb-internal.h"

	/*
	* Debug interface
	*
	* Per radio controller debugfs files (in uwb/uwbN/):
	*
	* command: Flexible command interface (see <linux/uwb/debug-cmd.h>).
	*
	* reservations: information on reservations.
	*
	* accept: Set to true (Y or 1) to accept reservation requests from
	* peers.
	*
	* drp_avail: DRP availability information.
	*/

	struct uwb_dbg {
	struct uwb_pal pal;

	bool accept;
	struct list_head rsvs;

	struct dentry *root_d;
	struct dentry *command_f;
	struct dentry *reservations_f;
	struct dentry *accept_f;
	struct dentry *drp_avail_f;
	spinlock_t list_lock;
	};

	static struct dentry *root_dir;

	static void uwb_dbg_rsv_cb(struct uwb_rsv *rsv)
	{
	struct uwb_dbg *dbg = rsv->pal_priv;

	uwb_rsv_dump("debug", rsv);

	if (rsv->state == UWB_RSV_STATE_NONE) {
	spin_lock(&dbg->list_lock);
	list_del(&rsv->pal_node);
	spin_unlock(&dbg->list_lock);
	uwb_rsv_destroy(rsv);
	}
	}

	static int cmd_rsv_establish(struct uwb_rc *rc,
	struct uwb_dbg_cmd_rsv_establish *cmd)
	{
	struct uwb_mac_addr macaddr;
	struct uwb_rsv *rsv;
	struct uwb_dev *target;
	int ret;

	memcpy(&macaddr, cmd->target, sizeof(macaddr));
	target = uwb_dev_get_by_macaddr(rc, &macaddr);
	if (target == NULL)
	return -ENODEV;

	rsv = uwb_rsv_create(rc, uwb_dbg_rsv_cb, rc->dbg);
	if (rsv == NULL) {
	uwb_dev_put(target);
	return -ENOMEM;
	}

	rsv->target.type = UWB_RSV_TARGET_DEV;
	rsv->target.dev = target;
	rsv->type = cmd->type;
	rsv->max_mas = cmd->max_mas;
	rsv->min_mas = cmd->min_mas;
	rsv->max_interval = cmd->max_interval;

	ret = uwb_rsv_establish(rsv);
	if (ret)
	uwb_rsv_destroy(rsv);
	else {
	spin_lock(&(rc->dbg)->list_lock);
	list_add_tail(&rsv->pal_node, &rc->dbg->rsvs);
	spin_unlock(&(rc->dbg)->list_lock);
	}
	return ret;
	}

	static int cmd_rsv_terminate(struct uwb_rc *rc,
	struct uwb_dbg_cmd_rsv_terminate *cmd)
	{
	struct uwb_rsv rsv, found = NULL;
	int i = 0;

	spin_lock(&(rc->dbg)->list_lock);

	list_for_each_entry(rsv, &rc->dbg->rsvs, pal_node) {
	if (i == cmd->index) {
	found = rsv;
	uwb_rsv_get(found);
	break;
	}
	i++;
	}

	spin_unlock(&(rc->dbg)->list_lock);

	if (!found)
	return -EINVAL;

	uwb_rsv_terminate(found);
	uwb_rsv_put(found);

	return 0;
	}

	static int cmd_ie_add(struct uwb_rc rc, struct uwb_dbg_cmd_ie ie_to_add)
	{
	return uwb_rc_ie_add(rc,
	(const struct uwb_ie_hdr *) ie_to_add->data,
	ie_to_add->len);
	}

	static int cmd_ie_rm(struct uwb_rc rc, struct uwb_dbg_cmd_ie ie_to_rm)
	{
	return uwb_rc_ie_rm(rc, ie_to_rm->data[0]);
	}

	static ssize_t command_write(struct file file, const char __user buf,
	size_t len, loff_t *off)
	{
	struct uwb_rc *rc = file->private_data;
	struct uwb_dbg_cmd cmd;
	int ret = 0;

	if (len != sizeof(struct uwb_dbg_cmd))
	return -EINVAL;

	if (copy_from_user(&cmd, buf, len) != 0)
	return -EFAULT;

	switch (cmd.type) {
	case UWB_DBG_CMD_RSV_ESTABLISH:
	ret = cmd_rsv_establish(rc, &cmd.rsv_establish);
	break;
	case UWB_DBG_CMD_RSV_TERMINATE:
	ret = cmd_rsv_terminate(rc, &cmd.rsv_terminate);
	break;
	case UWB_DBG_CMD_IE_ADD:
	ret = cmd_ie_add(rc, &cmd.ie_add);
	break;
	case UWB_DBG_CMD_IE_RM:
	ret = cmd_ie_rm(rc, &cmd.ie_rm);
	break;
	case UWB_DBG_CMD_RADIO_START:
	ret = uwb_radio_start(&rc->dbg->pal);
	break;
	case UWB_DBG_CMD_RADIO_STOP:
	uwb_radio_stop(&rc->dbg->pal);
	break;
	default:
	return -EINVAL;
	}

	return ret < 0 ? ret : len;
	}

	static const struct file_operations command_fops = {
	.open = simple_open,
	.write = command_write,
	.read = NULL,
	.llseek = no_llseek,
	.owner = THIS_MODULE,
	};

	static int reservations_print(struct seq_file s, void p)
	{
	struct uwb_rc *rc = s->private;
	struct uwb_rsv *rsv;

	mutex_lock(&rc->rsvs_mutex);

	list_for_each_entry(rsv, &rc->reservations, rc_node) {
	struct uwb_dev_addr devaddr;
	char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE];
	bool is_owner;

	uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr);
	if (rsv->target.type == UWB_RSV_TARGET_DEV) {
	devaddr = rsv->target.dev->dev_addr;
	is_owner = &rc->uwb_dev == rsv->owner;
	} else {
	devaddr = rsv->target.devaddr;
	is_owner = true;
	}
	uwb_dev_addr_print(target, sizeof(target), &devaddr);

	seq_printf(s, "%c %s -> %s: %s\n",
	is_owner ? 'O' : 'T',
	owner, target, uwb_rsv_state_str(rsv->state));
	seq_printf(s, " stream: %d type: %s\n",
	rsv->stream, uwb_rsv_type_str(rsv->type));
	seq_printf(s, " %*pb\n", UWB_NUM_MAS, rsv->mas.bm);
	}

	mutex_unlock(&rc->rsvs_mutex);

	return 0;
	}

	static int reservations_open(struct inode inode, struct file file)
	{
	return single_open(file, reservations_print, inode->i_private);
	}

	static const struct file_operations reservations_fops = {
	.open = reservations_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
	};

	static int drp_avail_print(struct seq_file s, void p)
	{
	struct uwb_rc *rc = s->private;

	seq_printf(s, "global: %*pb\n", UWB_NUM_MAS, rc->drp_avail.global);
	seq_printf(s, "local: %*pb\n", UWB_NUM_MAS, rc->drp_avail.local);
	seq_printf(s, "pending: %*pb\n", UWB_NUM_MAS, rc->drp_avail.pending);

	return 0;
	}

	static int drp_avail_open(struct inode inode, struct file file)
	{
	return single_open(file, drp_avail_print, inode->i_private);
	}

	static const struct file_operations drp_avail_fops = {
	.open = drp_avail_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
	};

	static void uwb_dbg_channel_changed(struct uwb_pal *pal, int channel)
	{
	struct device *dev = &pal->rc->uwb_dev.dev;

	if (channel > 0)
	dev_info(dev, "debug: channel %d started\n", channel);
	else
	dev_info(dev, "debug: channel stopped\n");
	}

	static void uwb_dbg_new_rsv(struct uwb_pal pal, struct uwb_rsv rsv)
	{
	struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);

	if (dbg->accept) {
	spin_lock(&dbg->list_lock);
	list_add_tail(&rsv->pal_node, &dbg->rsvs);
	spin_unlock(&dbg->list_lock);
	uwb_rsv_accept(rsv, uwb_dbg_rsv_cb, dbg);
	}
	}

	/**
	* uwb_dbg_add_rc - add a debug interface for a radio controller
	* @rc: the radio controller
	*/
	void uwb_dbg_add_rc(struct uwb_rc *rc)
	{
	rc->dbg = kzalloc(sizeof(struct uwb_dbg), GFP_KERNEL);
	if (rc->dbg == NULL)
	return;

	INIT_LIST_HEAD(&rc->dbg->rsvs);
	spin_lock_init(&(rc->dbg)->list_lock);

	uwb_pal_init(&rc->dbg->pal);
	rc->dbg->pal.rc = rc;
	rc->dbg->pal.channel_changed = uwb_dbg_channel_changed;
	rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
	uwb_pal_register(&rc->dbg->pal);

	if (root_dir) {
	rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
	root_dir);
	rc->dbg->command_f = debugfs_create_file("command", 0200,
	rc->dbg->root_d, rc,
	&command_fops);
	rc->dbg->reservations_f = debugfs_create_file("reservations", 0444,
	rc->dbg->root_d, rc,
	&reservations_fops);
	rc->dbg->accept_f = debugfs_create_bool("accept", 0644,
	rc->dbg->root_d,
	&rc->dbg->accept);
	rc->dbg->drp_avail_f = debugfs_create_file("drp_avail", 0444,
	rc->dbg->root_d, rc,
	&drp_avail_fops);
	}
	}

	/**
	* uwb_dbg_del_rc - remove a radio controller's debug interface
	* @rc: the radio controller
	*/
	void uwb_dbg_del_rc(struct uwb_rc *rc)
	{
	struct uwb_rsv rsv, t;

	if (rc->dbg == NULL)
	return;

	list_for_each_entry_safe(rsv, t, &rc->dbg->rsvs, pal_node) {
	uwb_rsv_terminate(rsv);
	}

	uwb_pal_unregister(&rc->dbg->pal);

	if (root_dir) {
	debugfs_remove(rc->dbg->drp_avail_f);
	debugfs_remove(rc->dbg->accept_f);
	debugfs_remove(rc->dbg->reservations_f);
	debugfs_remove(rc->dbg->command_f);
	debugfs_remove(rc->dbg->root_d);
	}
	}

	/**
	* uwb_dbg_exit - initialize the debug interface sub-module
	*/
	void uwb_dbg_init(void)
	{
	root_dir = debugfs_create_dir("uwb", NULL);
	}

	/**
	* uwb_dbg_exit - clean-up the debug interface sub-module
	*/
	void uwb_dbg_exit(void)
	{
	debugfs_remove(root_dir);
	}

	/**
	* uwb_dbg_create_pal_dir - create a debugfs directory for a PAL
	* @pal: The PAL.
	*/
	struct dentry uwb_dbg_create_pal_dir(struct uwb_pal pal)
	{
	struct uwb_rc *rc = pal->rc;

	if (root_dir && rc->dbg && rc->dbg->root_d && pal->name)
	return debugfs_create_dir(pal->name, rc->dbg->root_d);
	return NULL;
	}