scan.c

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/*
 * Ultra Wide Band
 * Scanning management
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <[email protected]>
 *
 * 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
 * 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"


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));
    if (result < 0)
        goto error_cmd;
    if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
        dev_err(&rc->uwb_dev.dev,
            "SCAN: command execution failed: %s (%d)\n",
            uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
        result = -EIO;
        goto error_cmd;
    }
    rc->scanning = channel;
    rc->scan_type = type;
error_cmd:
    mutex_unlock(&rc->uwb_dev.mutex);
    kfree(cmd);
error_kzalloc:
    return result;
}

/*
 * Print scanning state
 */
static ssize_t uwb_rc_scan_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;
    ssize_t result;

    mutex_lock(&rc->uwb_dev.mutex);
    result = sprintf(buf, "%d %d\n", rc->scanning, rc->scan_type);
    mutex_unlock(&rc->uwb_dev.mutex);
    return result;
}

/*
 *
 */
static ssize_t uwb_rc_scan_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;
    unsigned channel;
    unsigned type;
    unsigned bpst_offset = 0;
    ssize_t result = -EINVAL;

    result = sscanf(buf, "%u %u %u\n", &channel, &type, &bpst_offset);
    if (result >= 2 && type < UWB_SCAN_TOP)
        result = uwb_rc_scan(rc, channel, type, bpst_offset);

    return result < 0 ? result : size;
}

DEVICE_ATTR(scan, S_IRUGO | S_IWUSR, uwb_rc_scan_show, uwb_rc_scan_store);