linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * Ultra Wide Band

 * Scanning management

 *

 * Copyright (C) 2005-2006 Intel Corporation

 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>

 *

 * FIXME: docs

 * FIXME: there are issues here on how BEACON and SCAN on USB RCI deal

 *        with each other. Currently seems that START_BEACON while

 *        SCAN_ONLY will cancel the scan, so we need to update the

 *        state here. Clarification request sent by email on

 *        10/05/2005.

 *        10/28/2005 No clear answer heard--maybe we'll hack the API

 *                   so that when we start beaconing, if the HC is

 *                   scanning in a mode not compatible with beaconing

 *                   we just fail.

 */

​

#include <linux/device.h>

#include <linux/err.h>

#include <linux/slab.h>

#include <linux/stat.h>

#include "uwb-internal.h"

​

​

/**

 * Start/stop scanning in a radio controller

 *

 * @rc:      UWB Radio Controller

 * @channel: Channel to scan; encodings in WUSB1.0[Table 5.12]

 * @type:    Type of scanning to do.

 * @bpst_offset: value at which to start scanning (if type ==

 *                UWB_SCAN_ONLY_STARTTIME)

 * @returns: 0 if ok, < 0 errno code on error

 *

 * We put the command on kmalloc'ed memory as some arches cannot do

 * USB from the stack. The reply event is copied from an stage buffer,

 * so it can be in the stack. See WUSB1.0[8.6.2.4] for more details.

 */

int uwb_rc_scan(struct uwb_rc *rc,

        unsigned channel, enum uwb_scan_type type,

        unsigned bpst_offset)

{

    int result;

    struct uwb_rc_cmd_scan *cmd;

    struct uwb_rc_evt_confirm reply;

​

    result = -ENOMEM;

    cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);

    if (cmd == NULL)

        goto error_kzalloc;

    mutex_lock(&rc->uwb_dev.mutex);

    cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;

    cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SCAN);

    cmd->bChannelNumber = channel;

    cmd->bScanState = type;

    cmd->wStartTime = cpu_to_le16(bpst_offset);

    reply.rceb.bEventType = UWB_RC_CET_GENERAL;

    reply.rceb.wEvent = UWB_RC_CMD_SCAN;

    result = uwb_rc_cmd(rc, "SCAN", &cmd->rccb, sizeof(*cmd),

                &reply.rceb, sizeof(reply));