drivers/uwb/address.c - kernel/msm-4.9 - Gitiles

 /*
  * Ultra Wide Band
  * Address management
  *
  * Copyright (C) 2005-2006 Intel Corporation
  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
  *
  * 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: docs
  */

 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/random.h>
 #include <linux/etherdevice.h>

 #include "uwb-internal.h"


 /** Device Address Management command */
 struct uwb_rc_cmd_dev_addr_mgmt {
 	struct uwb_rccb rccb;
 	u8 bmOperationType;
 	u8 baAddr[6];
 } __attribute__((packed));


 /**
  * Low level command for setting/getting UWB radio's addresses
  *
  * @hwarc:	HWA Radio Control interface instance
  * @bmOperationType:
  * 		Set/get, MAC/DEV (see WUSB1.0[8.6.2.2])
  * @baAddr:	address buffer--assumed to have enough data to hold
  *              the address type requested.
  * @reply:	Pointer to reply buffer (can be stack allocated)
  * @returns:	0 if ok, < 0 errno code on error.
  *
  * @cmd has to be allocated because USB cannot grok USB or vmalloc
  * buffers depending on your combination of host architecture.
  */
 static
 int uwb_rc_dev_addr_mgmt(struct uwb_rc *rc,
 			 u8 bmOperationType, const u8 *baAddr,
 			 struct uwb_rc_evt_dev_addr_mgmt *reply)
 {
 	int result;
 	struct uwb_rc_cmd_dev_addr_mgmt *cmd;

 	result = -ENOMEM;
 	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (cmd == NULL)
 		goto error_kzalloc;
 	cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
 	cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_DEV_ADDR_MGMT);
 	cmd->bmOperationType = bmOperationType;
 	if (baAddr) {
 		size_t size = 0;
 		switch (bmOperationType >> 1) {
 		case 0:	size = 2; break;
 		case 1:	size = 6; break;
 		default: BUG();
 		}
 		memcpy(cmd->baAddr, baAddr, size);
 	}
 	reply->rceb.bEventType = UWB_RC_CET_GENERAL;
 	reply->rceb.wEvent = UWB_RC_CMD_DEV_ADDR_MGMT;
 	result = uwb_rc_cmd(rc, "DEV-ADDR-MGMT",
 			    &cmd->rccb, sizeof(*cmd),
 			    &reply->rceb, sizeof(*reply));
 	if (result < 0)
 		goto error_cmd;
 	if (result < sizeof(*reply)) {
 		dev_err(&rc->uwb_dev.dev,
 			"DEV-ADDR-MGMT: not enough data replied: "
 			"%d vs %zu bytes needed\n", result, sizeof(*reply));
 		result = -ENOMSG;
 	} else if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
 		dev_err(&rc->uwb_dev.dev,
 			"DEV-ADDR-MGMT: command execution failed: %s (%d)\n",
 			uwb_rc_strerror(reply->bResultCode),
 			reply->bResultCode);
 		result = -EIO;
 	} else
 		result = 0;
 error_cmd:
 	kfree(cmd);
 error_kzalloc:
 	return result;
 }


 /**
  * Set the UWB RC MAC or device address.
  *
  * @rc:      UWB Radio Controller
  * @_addr:   Pointer to address to write [assumed to be either a
  *           'struct uwb_mac_addr *' or a 'struct uwb_dev_addr *'].
  * @type:    Type of address to set (UWB_ADDR_DEV or UWB_ADDR_MAC).
  * @returns: 0 if ok, < 0 errno code on error.
  *
  * Some anal retentivity here: even if both 'struct
  * uwb_{dev,mac}_addr' have the actual byte array in the same offset
  * and I could just pass _addr to hwarc_cmd_dev_addr_mgmt(), I prefer
  * to use some syntatic sugar in case someday we decide to change the
  * format of the structs. The compiler will optimize it out anyway.
  */
 static int uwb_rc_addr_set(struct uwb_rc *rc,
 		    const void *_addr, enum uwb_addr_type type)
 {
 	int result;
 	u8 bmOperationType = 0x1; 		/* Set address */
 	const struct uwb_dev_addr *dev_addr = _addr;
 	const struct uwb_mac_addr *mac_addr = _addr;
 	struct uwb_rc_evt_dev_addr_mgmt reply;
 	const u8 *baAddr;

 	result = -EINVAL;
 	switch (type) {
 	case UWB_ADDR_DEV:
 		baAddr = dev_addr->data;
 		break;
 	case UWB_ADDR_MAC:
 		baAddr = mac_addr->data;
 		bmOperationType |= 0x2;
 		break;
 	default:
 		return result;
 	}
 	return uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &reply);
 }


 /**
  * Get the UWB radio's MAC or device address.
  *
  * @rc:      UWB Radio Controller
  * @_addr:   Where to write the address data [assumed to be either a
  *           'struct uwb_mac_addr *' or a 'struct uwb_dev_addr *'].
  * @type:    Type of address to get (UWB_ADDR_DEV or UWB_ADDR_MAC).
  * @returns: 0 if ok (and *_addr set), < 0 errno code on error.
  *
  * See comment in uwb_rc_addr_set() about anal retentivity in the
  * type handling of the address variables.
  */
 static int uwb_rc_addr_get(struct uwb_rc *rc,
 		    void *_addr, enum uwb_addr_type type)
 {
 	int result;
 	u8 bmOperationType = 0x0; 		/* Get address */
 	struct uwb_rc_evt_dev_addr_mgmt evt;
 	struct uwb_dev_addr *dev_addr = _addr;
 	struct uwb_mac_addr *mac_addr = _addr;
 	u8 *baAddr;

 	result = -EINVAL;
 	switch (type) {
 	case UWB_ADDR_DEV:
 		baAddr = dev_addr->data;
 		break;
 	case UWB_ADDR_MAC:
 		bmOperationType |= 0x2;
 		baAddr = mac_addr->data;
 		break;
 	default:
 		return result;
 	}
 	result = uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &evt);
 	if (result == 0)
 		switch (type) {
 		case UWB_ADDR_DEV:
 			memcpy(&dev_addr->data, evt.baAddr,
 			       sizeof(dev_addr->data));
 			break;
 		case UWB_ADDR_MAC:
 			memcpy(&mac_addr->data, evt.baAddr,
 			       sizeof(mac_addr->data));
 			break;
 		default:		/* shut gcc up */
 			BUG();
 		}
 	return result;
 }


 /** Get @rc's MAC address to @addr */
 int uwb_rc_mac_addr_get(struct uwb_rc *rc,
 			struct uwb_mac_addr *addr) {
 	return uwb_rc_addr_get(rc, addr, UWB_ADDR_MAC);
 }
 EXPORT_SYMBOL_GPL(uwb_rc_mac_addr_get);


 /** Get @rc's device address to @addr */
 int uwb_rc_dev_addr_get(struct uwb_rc *rc,
 			struct uwb_dev_addr *addr) {
 	return uwb_rc_addr_get(rc, addr, UWB_ADDR_DEV);
 }
 EXPORT_SYMBOL_GPL(uwb_rc_dev_addr_get);


 /** Set @rc's address to @addr */
 int uwb_rc_mac_addr_set(struct uwb_rc *rc,
 			const struct uwb_mac_addr *addr)
 {
 	int result = -EINVAL;
 	mutex_lock(&rc->uwb_dev.mutex);
 	result = uwb_rc_addr_set(rc, addr, UWB_ADDR_MAC);
 	mutex_unlock(&rc->uwb_dev.mutex);
 	return result;
 }


 /** Set @rc's address to @addr */
 int uwb_rc_dev_addr_set(struct uwb_rc *rc,
 			const struct uwb_dev_addr *addr)
 {
 	int result = -EINVAL;
 	mutex_lock(&rc->uwb_dev.mutex);
 	result = uwb_rc_addr_set(rc, addr, UWB_ADDR_DEV);
 	rc->uwb_dev.dev_addr = *addr;
 	mutex_unlock(&rc->uwb_dev.mutex);
 	return result;
 }

 /* Returns !0 if given address is already assigned to device. */
 int __uwb_mac_addr_assigned_check(struct device *dev, void *_addr)
 {
 	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 	struct uwb_mac_addr *addr = _addr;

 	if (!uwb_mac_addr_cmp(addr, &uwb_dev->mac_addr))
 		return !0;
 	return 0;
 }

 /* Returns !0 if given address is already assigned to device. */
 int __uwb_dev_addr_assigned_check(struct device *dev, void *_addr)
 {
 	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 	struct uwb_dev_addr *addr = _addr;
 	if (!uwb_dev_addr_cmp(addr, &uwb_dev->dev_addr))
 		return !0;
 	return 0;
 }

 /**
  * uwb_dev_addr_assign - assigned a generated DevAddr to a radio controller
  * @rc:      the (local) radio controller device requiring a new DevAddr
  *
  * A new DevAddr is required when:
  *    - first setting up a radio controller
  *    - if the hardware reports a DevAddr conflict
  *
  * The DevAddr is randomly generated in the generated DevAddr range
  * [0x100, 0xfeff]. The number of devices in a beacon group is limited
  * by mMaxBPLength (96) so this address space will never be exhausted.
  *
  * [ECMA-368] 17.1.1, 17.16.
  */
 int uwb_rc_dev_addr_assign(struct uwb_rc *rc)
 {
 	struct uwb_dev_addr new_addr;

 	do {
 		get_random_bytes(new_addr.data, sizeof(new_addr.data));
 	} while (new_addr.data[0] == 0x00 || new_addr.data[0] == 0xff
 		 || __uwb_dev_addr_assigned(rc, &new_addr));

 	return uwb_rc_dev_addr_set(rc, &new_addr);
 }

 /**
  * uwbd_evt_handle_rc_dev_addr_conflict - handle a DEV_ADDR_CONFLICT event
  * @evt: the DEV_ADDR_CONFLICT notification from the radio controller
  *
  * A new (non-conflicting) DevAddr is assigned to the radio controller.
  *
  * [ECMA-368] 17.1.1.1.
  */
 int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt)
 {
 	struct uwb_rc *rc = evt->rc;

 	return uwb_rc_dev_addr_assign(rc);
 }

 /*
  * Print the 48-bit EUI MAC address of the radio controller when
  * reading /sys/class/uwb_rc/XX/mac_address
  */
 static ssize_t uwb_rc_mac_addr_show(struct device *dev,
 				    struct device_attribute *attr, char *buf)
 {
 	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 	struct uwb_rc *rc = uwb_dev->rc;
 	struct uwb_mac_addr addr;
 	ssize_t result;

 	mutex_lock(&rc->uwb_dev.mutex);
 	result = uwb_rc_addr_get(rc, &addr, UWB_ADDR_MAC);
 	mutex_unlock(&rc->uwb_dev.mutex);
 	if (result >= 0) {
 		result = uwb_mac_addr_print(buf, UWB_ADDR_STRSIZE, &addr);
 		buf[result++] = '\n';
 	}
 	return result;
 }

 /*
  * Parse a 48 bit address written to /sys/class/uwb_rc/XX/mac_address
  * and if correct, set it.
  */
 static ssize_t uwb_rc_mac_addr_store(struct device *dev,
 				     struct device_attribute *attr,
 				     const char *buf, size_t size)
 {
 	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
 	struct uwb_rc *rc = uwb_dev->rc;
 	struct uwb_mac_addr addr;
 	ssize_t result;

 	result = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx\n",
 			&addr.data[0], &addr.data[1], &addr.data[2],
 			&addr.data[3], &addr.data[4], &addr.data[5]);
 	if (result != 6) {
 		result = -EINVAL;
 		goto out;
 	}
 	if (is_multicast_ether_addr(addr.data)) {
 		dev_err(&rc->uwb_dev.dev, "refusing to set multicast "
 			"MAC address %s\n", buf);
 		result = -EINVAL;
 		goto out;
 	}
 	result = uwb_rc_mac_addr_set(rc, &addr);
 	if (result == 0)
 		rc->uwb_dev.mac_addr = addr;
 out:
 	return result < 0 ? result : size;
 }
 DEVICE_ATTR(mac_address, S_IRUGO | S_IWUSR, uwb_rc_mac_addr_show, uwb_rc_mac_addr_store);

 /** Print @addr to @buf, @return bytes written */
 size_t __uwb_addr_print(char *buf, size_t buf_size, const unsigned char *addr,
 			int type)
 {
 	size_t result;
 	if (type)
 		result = scnprintf(buf, buf_size,
 				  "%02x:%02x:%02x:%02x:%02x:%02x",
 				  addr[0], addr[1], addr[2],
 				  addr[3], addr[4], addr[5]);
 	else
 		result = scnprintf(buf, buf_size, "%02x:%02x",
 				  addr[1], addr[0]);
 	return result;
 }
 EXPORT_SYMBOL_GPL(__uwb_addr_print);
	/*
	* Ultra Wide Band
	* Address management
	*
	* Copyright (C) 2005-2006 Intel Corporation
	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	*
	* 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: docs
	*/

	#include <linux/errno.h>
	#include <linux/module.h>
	#include <linux/device.h>
	#include <linux/random.h>
	#include <linux/etherdevice.h>

	#include "uwb-internal.h"


	/** Device Address Management command */
	struct uwb_rc_cmd_dev_addr_mgmt {
	struct uwb_rccb rccb;
	u8 bmOperationType;
	u8 baAddr[6];
	} __attribute__((packed));


	/**
	* Low level command for setting/getting UWB radio's addresses
	*
	* @hwarc: HWA Radio Control interface instance
	* @bmOperationType:
	* Set/get, MAC/DEV (see WUSB1.0[8.6.2.2])
	* @baAddr: address buffer--assumed to have enough data to hold
	* the address type requested.
	* @reply: Pointer to reply buffer (can be stack allocated)
	* @returns: 0 if ok, < 0 errno code on error.
	*
	* @cmd has to be allocated because USB cannot grok USB or vmalloc
	* buffers depending on your combination of host architecture.
	*/
	static
	int uwb_rc_dev_addr_mgmt(struct uwb_rc *rc,
	u8 bmOperationType, const u8 *baAddr,
	struct uwb_rc_evt_dev_addr_mgmt *reply)
	{
	int result;
	struct uwb_rc_cmd_dev_addr_mgmt *cmd;

	result = -ENOMEM;
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
	goto error_kzalloc;
	cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
	cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_DEV_ADDR_MGMT);
	cmd->bmOperationType = bmOperationType;
	if (baAddr) {
	size_t size = 0;
	switch (bmOperationType >> 1) {
	case 0: size = 2; break;
	case 1: size = 6; break;
	default: BUG();
	}
	memcpy(cmd->baAddr, baAddr, size);
	}
	reply->rceb.bEventType = UWB_RC_CET_GENERAL;
	reply->rceb.wEvent = UWB_RC_CMD_DEV_ADDR_MGMT;
	result = uwb_rc_cmd(rc, "DEV-ADDR-MGMT",
	&cmd->rccb, sizeof(*cmd),
	&reply->rceb, sizeof(*reply));
	if (result < 0)
	goto error_cmd;
	if (result < sizeof(*reply)) {
	dev_err(&rc->uwb_dev.dev,
	"DEV-ADDR-MGMT: not enough data replied: "
	"%d vs %zu bytes needed\n", result, sizeof(*reply));
	result = -ENOMSG;
	} else if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
	dev_err(&rc->uwb_dev.dev,
	"DEV-ADDR-MGMT: command execution failed: %s (%d)\n",
	uwb_rc_strerror(reply->bResultCode),
	reply->bResultCode);
	result = -EIO;
	} else
	result = 0;
	error_cmd:
	kfree(cmd);
	error_kzalloc:
	return result;
	}


	/**
	* Set the UWB RC MAC or device address.
	*
	* @rc: UWB Radio Controller
	* @_addr: Pointer to address to write [assumed to be either a
	* 'struct uwb_mac_addr ' or a 'struct uwb_dev_addr '].
	* @type: Type of address to set (UWB_ADDR_DEV or UWB_ADDR_MAC).
	* @returns: 0 if ok, < 0 errno code on error.
	*
	* Some anal retentivity here: even if both 'struct
	* uwb_{dev,mac}_addr' have the actual byte array in the same offset
	* and I could just pass _addr to hwarc_cmd_dev_addr_mgmt(), I prefer
	* to use some syntatic sugar in case someday we decide to change the
	* format of the structs. The compiler will optimize it out anyway.
	*/
	static int uwb_rc_addr_set(struct uwb_rc *rc,
	const void *_addr, enum uwb_addr_type type)
	{
	int result;
	u8 bmOperationType = 0x1; /* Set address */
	const struct uwb_dev_addr *dev_addr = _addr;
	const struct uwb_mac_addr *mac_addr = _addr;
	struct uwb_rc_evt_dev_addr_mgmt reply;
	const u8 *baAddr;

	result = -EINVAL;
	switch (type) {
	case UWB_ADDR_DEV:
	baAddr = dev_addr->data;
	break;
	case UWB_ADDR_MAC:
	baAddr = mac_addr->data;
	bmOperationType \|= 0x2;
	break;
	default:
	return result;
	}
	return uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &reply);
	}


	/**
	* Get the UWB radio's MAC or device address.
	*
	* @rc: UWB Radio Controller
	* @_addr: Where to write the address data [assumed to be either a
	* 'struct uwb_mac_addr ' or a 'struct uwb_dev_addr '].
	* @type: Type of address to get (UWB_ADDR_DEV or UWB_ADDR_MAC).
	* @returns: 0 if ok (and *_addr set), < 0 errno code on error.
	*
	* See comment in uwb_rc_addr_set() about anal retentivity in the
	* type handling of the address variables.
	*/
	static int uwb_rc_addr_get(struct uwb_rc *rc,
	void *_addr, enum uwb_addr_type type)
	{
	int result;
	u8 bmOperationType = 0x0; /* Get address */
	struct uwb_rc_evt_dev_addr_mgmt evt;
	struct uwb_dev_addr *dev_addr = _addr;
	struct uwb_mac_addr *mac_addr = _addr;
	u8 *baAddr;

	result = -EINVAL;
	switch (type) {
	case UWB_ADDR_DEV:
	baAddr = dev_addr->data;
	break;
	case UWB_ADDR_MAC:
	bmOperationType \|= 0x2;
	baAddr = mac_addr->data;
	break;
	default:
	return result;
	}
	result = uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &evt);
	if (result == 0)
	switch (type) {
	case UWB_ADDR_DEV:
	memcpy(&dev_addr->data, evt.baAddr,
	sizeof(dev_addr->data));
	break;
	case UWB_ADDR_MAC:
	memcpy(&mac_addr->data, evt.baAddr,
	sizeof(mac_addr->data));
	break;
	default: /* shut gcc up */
	BUG();
	}
	return result;
	}


	/** Get @rc's MAC address to @addr */
	int uwb_rc_mac_addr_get(struct uwb_rc *rc,
	struct uwb_mac_addr *addr) {
	return uwb_rc_addr_get(rc, addr, UWB_ADDR_MAC);
	}
	EXPORT_SYMBOL_GPL(uwb_rc_mac_addr_get);


	/** Get @rc's device address to @addr */
	int uwb_rc_dev_addr_get(struct uwb_rc *rc,
	struct uwb_dev_addr *addr) {
	return uwb_rc_addr_get(rc, addr, UWB_ADDR_DEV);
	}
	EXPORT_SYMBOL_GPL(uwb_rc_dev_addr_get);


	/** Set @rc's address to @addr */
	int uwb_rc_mac_addr_set(struct uwb_rc *rc,
	const struct uwb_mac_addr *addr)
	{
	int result = -EINVAL;
	mutex_lock(&rc->uwb_dev.mutex);
	result = uwb_rc_addr_set(rc, addr, UWB_ADDR_MAC);
	mutex_unlock(&rc->uwb_dev.mutex);
	return result;
	}


	/** Set @rc's address to @addr */
	int uwb_rc_dev_addr_set(struct uwb_rc *rc,
	const struct uwb_dev_addr *addr)
	{
	int result = -EINVAL;
	mutex_lock(&rc->uwb_dev.mutex);
	result = uwb_rc_addr_set(rc, addr, UWB_ADDR_DEV);
	rc->uwb_dev.dev_addr = *addr;
	mutex_unlock(&rc->uwb_dev.mutex);
	return result;
	}

	/* Returns !0 if given address is already assigned to device. */
	int __uwb_mac_addr_assigned_check(struct device dev, void _addr)
	{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_mac_addr *addr = _addr;

	if (!uwb_mac_addr_cmp(addr, &uwb_dev->mac_addr))
	return !0;
	return 0;
	}

	/* Returns !0 if given address is already assigned to device. */
	int __uwb_dev_addr_assigned_check(struct device dev, void _addr)
	{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_dev_addr *addr = _addr;
	if (!uwb_dev_addr_cmp(addr, &uwb_dev->dev_addr))
	return !0;
	return 0;
	}

	/**
	* uwb_dev_addr_assign - assigned a generated DevAddr to a radio controller
	* @rc: the (local) radio controller device requiring a new DevAddr
	*
	* A new DevAddr is required when:
	* - first setting up a radio controller
	* - if the hardware reports a DevAddr conflict
	*
	* The DevAddr is randomly generated in the generated DevAddr range
	* [0x100, 0xfeff]. The number of devices in a beacon group is limited
	* by mMaxBPLength (96) so this address space will never be exhausted.
	*
	* [ECMA-368] 17.1.1, 17.16.
	*/
	int uwb_rc_dev_addr_assign(struct uwb_rc *rc)
	{
	struct uwb_dev_addr new_addr;

	do {
	get_random_bytes(new_addr.data, sizeof(new_addr.data));
	} while (new_addr.data[0] == 0x00 \|\| new_addr.data[0] == 0xff
	\|\| __uwb_dev_addr_assigned(rc, &new_addr));

	return uwb_rc_dev_addr_set(rc, &new_addr);
	}

	/**
	* uwbd_evt_handle_rc_dev_addr_conflict - handle a DEV_ADDR_CONFLICT event
	* @evt: the DEV_ADDR_CONFLICT notification from the radio controller
	*
	* A new (non-conflicting) DevAddr is assigned to the radio controller.
	*
	* [ECMA-368] 17.1.1.1.
	*/
	int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt)
	{
	struct uwb_rc *rc = evt->rc;

	return uwb_rc_dev_addr_assign(rc);
	}

	/*
	* Print the 48-bit EUI MAC address of the radio controller when
	* reading /sys/class/uwb_rc/XX/mac_address
	*/
	static ssize_t uwb_rc_mac_addr_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_rc *rc = uwb_dev->rc;
	struct uwb_mac_addr addr;
	ssize_t result;

	mutex_lock(&rc->uwb_dev.mutex);
	result = uwb_rc_addr_get(rc, &addr, UWB_ADDR_MAC);
	mutex_unlock(&rc->uwb_dev.mutex);
	if (result >= 0) {
	result = uwb_mac_addr_print(buf, UWB_ADDR_STRSIZE, &addr);
	buf[result++] = '\n';
	}
	return result;
	}

	/*
	* Parse a 48 bit address written to /sys/class/uwb_rc/XX/mac_address
	* and if correct, set it.
	*/
	static ssize_t uwb_rc_mac_addr_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_rc *rc = uwb_dev->rc;
	struct uwb_mac_addr addr;
	ssize_t result;

	result = sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx\n",
	&addr.data[0], &addr.data[1], &addr.data[2],
	&addr.data[3], &addr.data[4], &addr.data[5]);
	if (result != 6) {
	result = -EINVAL;
	goto out;
	}
	if (is_multicast_ether_addr(addr.data)) {
	dev_err(&rc->uwb_dev.dev, "refusing to set multicast "
	"MAC address %s\n", buf);
	result = -EINVAL;
	goto out;
	}
	result = uwb_rc_mac_addr_set(rc, &addr);
	if (result == 0)
	rc->uwb_dev.mac_addr = addr;
	out:
	return result < 0 ? result : size;
	}
	DEVICE_ATTR(mac_address, S_IRUGO \| S_IWUSR, uwb_rc_mac_addr_show, uwb_rc_mac_addr_store);

	/** Print @addr to @buf, @return bytes written */
	size_t __uwb_addr_print(char buf, size_t buf_size, const unsigned char addr,
	int type)
	{
	size_t result;
	if (type)
	result = scnprintf(buf, buf_size,
	"%02x:%02x:%02x:%02x:%02x:%02x",
	addr[0], addr[1], addr[2],
	addr[3], addr[4], addr[5]);
	else
	result = scnprintf(buf, buf_size, "%02x:%02x",
	addr[1], addr[0]);
	return result;
	}
	EXPORT_SYMBOL_GPL(__uwb_addr_print);