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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 46 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141334.135501091@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
353 lines
9.4 KiB
C
353 lines
9.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Ultra Wide Band
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* Address management
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* FIXME: docs
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*/
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/random.h>
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#include <linux/etherdevice.h>
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#include "uwb-internal.h"
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/** Device Address Management command */
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struct uwb_rc_cmd_dev_addr_mgmt {
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struct uwb_rccb rccb;
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u8 bmOperationType;
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u8 baAddr[6];
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} __attribute__((packed));
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/**
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* Low level command for setting/getting UWB radio's addresses
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*
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* @hwarc: HWA Radio Control interface instance
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* @bmOperationType:
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* Set/get, MAC/DEV (see WUSB1.0[8.6.2.2])
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* @baAddr: address buffer--assumed to have enough data to hold
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* the address type requested.
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* @reply: Pointer to reply buffer (can be stack allocated)
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* @returns: 0 if ok, < 0 errno code on error.
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*
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* @cmd has to be allocated because USB cannot grok USB or vmalloc
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* buffers depending on your combination of host architecture.
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*/
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static
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int uwb_rc_dev_addr_mgmt(struct uwb_rc *rc,
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u8 bmOperationType, const u8 *baAddr,
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struct uwb_rc_evt_dev_addr_mgmt *reply)
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{
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int result;
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struct uwb_rc_cmd_dev_addr_mgmt *cmd;
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result = -ENOMEM;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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if (cmd == NULL)
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goto error_kzalloc;
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cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
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cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_DEV_ADDR_MGMT);
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cmd->bmOperationType = bmOperationType;
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if (baAddr) {
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size_t size = 0;
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switch (bmOperationType >> 1) {
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case 0: size = 2; break;
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case 1: size = 6; break;
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default: BUG();
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}
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memcpy(cmd->baAddr, baAddr, size);
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}
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reply->rceb.bEventType = UWB_RC_CET_GENERAL;
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reply->rceb.wEvent = UWB_RC_CMD_DEV_ADDR_MGMT;
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result = uwb_rc_cmd(rc, "DEV-ADDR-MGMT",
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&cmd->rccb, sizeof(*cmd),
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&reply->rceb, sizeof(*reply));
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if (result < 0)
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goto error_cmd;
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if (result < sizeof(*reply)) {
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dev_err(&rc->uwb_dev.dev,
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"DEV-ADDR-MGMT: not enough data replied: "
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"%d vs %zu bytes needed\n", result, sizeof(*reply));
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result = -ENOMSG;
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} else if (reply->bResultCode != UWB_RC_RES_SUCCESS) {
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dev_err(&rc->uwb_dev.dev,
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"DEV-ADDR-MGMT: command execution failed: %s (%d)\n",
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uwb_rc_strerror(reply->bResultCode),
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reply->bResultCode);
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result = -EIO;
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} else
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result = 0;
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error_cmd:
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kfree(cmd);
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error_kzalloc:
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return result;
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}
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/**
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* Set the UWB RC MAC or device address.
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*
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* @rc: UWB Radio Controller
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* @_addr: Pointer to address to write [assumed to be either a
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* 'struct uwb_mac_addr *' or a 'struct uwb_dev_addr *'].
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* @type: Type of address to set (UWB_ADDR_DEV or UWB_ADDR_MAC).
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* @returns: 0 if ok, < 0 errno code on error.
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*
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* Some anal retentivity here: even if both 'struct
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* uwb_{dev,mac}_addr' have the actual byte array in the same offset
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* and I could just pass _addr to hwarc_cmd_dev_addr_mgmt(), I prefer
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* to use some syntatic sugar in case someday we decide to change the
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* format of the structs. The compiler will optimize it out anyway.
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*/
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static int uwb_rc_addr_set(struct uwb_rc *rc,
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const void *_addr, enum uwb_addr_type type)
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{
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int result;
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u8 bmOperationType = 0x1; /* Set address */
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const struct uwb_dev_addr *dev_addr = _addr;
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const struct uwb_mac_addr *mac_addr = _addr;
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struct uwb_rc_evt_dev_addr_mgmt reply;
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const u8 *baAddr;
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result = -EINVAL;
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switch (type) {
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case UWB_ADDR_DEV:
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baAddr = dev_addr->data;
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break;
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case UWB_ADDR_MAC:
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baAddr = mac_addr->data;
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bmOperationType |= 0x2;
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break;
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default:
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return result;
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}
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return uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &reply);
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}
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/**
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* Get the UWB radio's MAC or device address.
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*
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* @rc: UWB Radio Controller
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* @_addr: Where to write the address data [assumed to be either a
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* 'struct uwb_mac_addr *' or a 'struct uwb_dev_addr *'].
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* @type: Type of address to get (UWB_ADDR_DEV or UWB_ADDR_MAC).
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* @returns: 0 if ok (and *_addr set), < 0 errno code on error.
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*
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* See comment in uwb_rc_addr_set() about anal retentivity in the
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* type handling of the address variables.
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*/
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static int uwb_rc_addr_get(struct uwb_rc *rc,
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void *_addr, enum uwb_addr_type type)
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{
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int result;
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u8 bmOperationType = 0x0; /* Get address */
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struct uwb_rc_evt_dev_addr_mgmt evt;
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struct uwb_dev_addr *dev_addr = _addr;
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struct uwb_mac_addr *mac_addr = _addr;
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u8 *baAddr;
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result = -EINVAL;
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switch (type) {
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case UWB_ADDR_DEV:
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baAddr = dev_addr->data;
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break;
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case UWB_ADDR_MAC:
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bmOperationType |= 0x2;
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baAddr = mac_addr->data;
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break;
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default:
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return result;
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}
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result = uwb_rc_dev_addr_mgmt(rc, bmOperationType, baAddr, &evt);
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if (result == 0)
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switch (type) {
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case UWB_ADDR_DEV:
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memcpy(&dev_addr->data, evt.baAddr,
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sizeof(dev_addr->data));
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break;
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case UWB_ADDR_MAC:
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memcpy(&mac_addr->data, evt.baAddr,
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sizeof(mac_addr->data));
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break;
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default: /* shut gcc up */
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BUG();
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}
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return result;
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}
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/** Get @rc's MAC address to @addr */
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int uwb_rc_mac_addr_get(struct uwb_rc *rc,
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struct uwb_mac_addr *addr) {
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return uwb_rc_addr_get(rc, addr, UWB_ADDR_MAC);
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}
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EXPORT_SYMBOL_GPL(uwb_rc_mac_addr_get);
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/** Get @rc's device address to @addr */
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int uwb_rc_dev_addr_get(struct uwb_rc *rc,
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struct uwb_dev_addr *addr) {
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return uwb_rc_addr_get(rc, addr, UWB_ADDR_DEV);
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}
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EXPORT_SYMBOL_GPL(uwb_rc_dev_addr_get);
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/** Set @rc's address to @addr */
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int uwb_rc_mac_addr_set(struct uwb_rc *rc,
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const struct uwb_mac_addr *addr)
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{
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int result = -EINVAL;
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mutex_lock(&rc->uwb_dev.mutex);
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result = uwb_rc_addr_set(rc, addr, UWB_ADDR_MAC);
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mutex_unlock(&rc->uwb_dev.mutex);
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return result;
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}
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/** Set @rc's address to @addr */
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int uwb_rc_dev_addr_set(struct uwb_rc *rc,
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const struct uwb_dev_addr *addr)
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{
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int result = -EINVAL;
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mutex_lock(&rc->uwb_dev.mutex);
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result = uwb_rc_addr_set(rc, addr, UWB_ADDR_DEV);
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rc->uwb_dev.dev_addr = *addr;
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mutex_unlock(&rc->uwb_dev.mutex);
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return result;
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}
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/* Returns !0 if given address is already assigned to device. */
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int __uwb_mac_addr_assigned_check(struct device *dev, void *_addr)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_mac_addr *addr = _addr;
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if (!uwb_mac_addr_cmp(addr, &uwb_dev->mac_addr))
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return !0;
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return 0;
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}
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/* Returns !0 if given address is already assigned to device. */
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int __uwb_dev_addr_assigned_check(struct device *dev, void *_addr)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_dev_addr *addr = _addr;
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if (!uwb_dev_addr_cmp(addr, &uwb_dev->dev_addr))
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return !0;
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return 0;
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}
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/**
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* uwb_dev_addr_assign - assigned a generated DevAddr to a radio controller
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* @rc: the (local) radio controller device requiring a new DevAddr
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*
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* A new DevAddr is required when:
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* - first setting up a radio controller
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* - if the hardware reports a DevAddr conflict
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*
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* The DevAddr is randomly generated in the generated DevAddr range
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* [0x100, 0xfeff]. The number of devices in a beacon group is limited
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* by mMaxBPLength (96) so this address space will never be exhausted.
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*
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* [ECMA-368] 17.1.1, 17.16.
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*/
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int uwb_rc_dev_addr_assign(struct uwb_rc *rc)
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{
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struct uwb_dev_addr new_addr;
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do {
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get_random_bytes(new_addr.data, sizeof(new_addr.data));
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} while (new_addr.data[0] == 0x00 || new_addr.data[0] == 0xff
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|| __uwb_dev_addr_assigned(rc, &new_addr));
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return uwb_rc_dev_addr_set(rc, &new_addr);
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}
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/**
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* uwbd_evt_handle_rc_dev_addr_conflict - handle a DEV_ADDR_CONFLICT event
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* @evt: the DEV_ADDR_CONFLICT notification from the radio controller
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*
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* A new (non-conflicting) DevAddr is assigned to the radio controller.
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*
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* [ECMA-368] 17.1.1.1.
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*/
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int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt)
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{
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struct uwb_rc *rc = evt->rc;
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return uwb_rc_dev_addr_assign(rc);
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}
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/*
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* Print the 48-bit EUI MAC address of the radio controller when
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* reading /sys/class/uwb_rc/XX/mac_address
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*/
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static ssize_t uwb_rc_mac_addr_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_rc *rc = uwb_dev->rc;
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struct uwb_mac_addr addr;
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ssize_t result;
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mutex_lock(&rc->uwb_dev.mutex);
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result = uwb_rc_addr_get(rc, &addr, UWB_ADDR_MAC);
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mutex_unlock(&rc->uwb_dev.mutex);
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if (result >= 0) {
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result = uwb_mac_addr_print(buf, UWB_ADDR_STRSIZE, &addr);
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buf[result++] = '\n';
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}
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return result;
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}
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/*
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* Parse a 48 bit address written to /sys/class/uwb_rc/XX/mac_address
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* and if correct, set it.
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*/
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static ssize_t uwb_rc_mac_addr_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_rc *rc = uwb_dev->rc;
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struct uwb_mac_addr addr;
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ssize_t result;
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if (!mac_pton(buf, addr.data))
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return -EINVAL;
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if (is_multicast_ether_addr(addr.data)) {
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dev_err(&rc->uwb_dev.dev, "refusing to set multicast "
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"MAC address %s\n", buf);
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return -EINVAL;
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}
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result = uwb_rc_mac_addr_set(rc, &addr);
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if (result == 0)
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rc->uwb_dev.mac_addr = addr;
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return result < 0 ? result : size;
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}
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DEVICE_ATTR(mac_address, S_IRUGO | S_IWUSR, uwb_rc_mac_addr_show, uwb_rc_mac_addr_store);
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/** Print @addr to @buf, @return bytes written */
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size_t __uwb_addr_print(char *buf, size_t buf_size, const unsigned char *addr,
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int type)
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{
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size_t result;
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if (type)
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result = scnprintf(buf, buf_size, "%pM", addr);
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else
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result = scnprintf(buf, buf_size, "%02x:%02x",
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addr[1], addr[0]);
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return result;
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}
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EXPORT_SYMBOL_GPL(__uwb_addr_print);
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