event.c

Go to the documentation of this file.

/*
 * This file is part of wl1251
 *
 * Copyright (c) 1998-2007 Texas Instruments Incorporated
 * Copyright (C) 2008 Nokia Corporation
 *
 * 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 St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include "wl1251.h"
#include "reg.h"
#include "io.h"
#include "event.h"
#include "ps.h"

static int wl1251_event_scan_complete(struct wl1251 *wl,
                      struct event_mailbox *mbox)
{
    wl1251_debug(DEBUG_EVENT, "status: 0x%x, channels: %d",
             mbox->scheduled_scan_status,
             mbox->scheduled_scan_channels);

    if (wl->scanning) {
        ieee80211_scan_completed(wl->hw, false);
        wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
        wl->scanning = false;
    }

    return 0;
}

static void wl1251_event_mbox_dump(struct event_mailbox *mbox)
{
    wl1251_debug(DEBUG_EVENT, "MBOX DUMP:");
    wl1251_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
    wl1251_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
}

static int wl1251_event_process(struct wl1251 *wl, struct event_mailbox *mbox)
{
    int ret;
    u32 vector;

    wl1251_event_mbox_dump(mbox);

    vector = mbox->events_vector & ~(mbox->events_mask);
    wl1251_debug(DEBUG_EVENT, "vector: 0x%x", vector);

    if (vector & SCAN_COMPLETE_EVENT_ID) {
        ret = wl1251_event_scan_complete(wl, mbox);
        if (ret < 0)
            return ret;
    }

    if (vector & BSS_LOSE_EVENT_ID) {
        wl1251_debug(DEBUG_EVENT, "BSS_LOSE_EVENT");

        if (wl->psm_requested &&
            wl->station_mode != STATION_ACTIVE_MODE) {
            ret = wl1251_ps_set_mode(wl, STATION_ACTIVE_MODE);
            if (ret < 0)
                return ret;
        }
    }

    if (vector & SYNCHRONIZATION_TIMEOUT_EVENT_ID) {
        wl1251_debug(DEBUG_EVENT, "SYNCHRONIZATION_TIMEOUT_EVENT");

        /* indicate to the stack, that beacons have been lost */
        ieee80211_beacon_loss(wl->vif);
    }

    if (vector & REGAINED_BSS_EVENT_ID) {
        if (wl->psm_requested) {
            ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
            if (ret < 0)
                return ret;
        }
    }

    if (wl->vif && wl->rssi_thold) {
        if (vector & ROAMING_TRIGGER_LOW_RSSI_EVENT_ID) {
            wl1251_debug(DEBUG_EVENT,
                     "ROAMING_TRIGGER_LOW_RSSI_EVENT");
            ieee80211_cqm_rssi_notify(wl->vif,
                NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
                GFP_KERNEL);
        }

        if (vector & ROAMING_TRIGGER_REGAINED_RSSI_EVENT_ID) {
            wl1251_debug(DEBUG_EVENT,
                     "ROAMING_TRIGGER_REGAINED_RSSI_EVENT");
            ieee80211_cqm_rssi_notify(wl->vif,
                NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
                GFP_KERNEL);
        }
    }

    return 0;
}

/*
 * Poll the mailbox event field until any of the bits in the mask is set or a
 * timeout occurs (WL1251_EVENT_TIMEOUT in msecs)
 */
int wl1251_event_wait(struct wl1251 *wl, u32 mask, int timeout_ms)
{
    u32 events_vector, event;
    unsigned long timeout;

    timeout = jiffies + msecs_to_jiffies(timeout_ms);

    do {
        if (time_after(jiffies, timeout))
            return -ETIMEDOUT;

        msleep(1);

        /* read from both event fields */
        wl1251_mem_read(wl, wl->mbox_ptr[0], &events_vector,
                sizeof(events_vector));
        event = events_vector & mask;
        wl1251_mem_read(wl, wl->mbox_ptr[1], &events_vector,
                sizeof(events_vector));
        event |= events_vector & mask;
    } while (!event);

    return 0;
}

int wl1251_event_unmask(struct wl1251 *wl)
{
    int ret;

    ret = wl1251_acx_event_mbox_mask(wl, ~(wl->event_mask));
    if (ret < 0)
        return ret;

    return 0;
}

void wl1251_event_mbox_config(struct wl1251 *wl)
{
    wl->mbox_ptr[0] = wl1251_reg_read32(wl, REG_EVENT_MAILBOX_PTR);
    wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);

    wl1251_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
             wl->mbox_ptr[0], wl->mbox_ptr[1]);
}

int wl1251_event_handle(struct wl1251 *wl, u8 mbox_num)
{
    struct event_mailbox mbox;
    int ret;

    wl1251_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);

    if (mbox_num > 1)
        return -EINVAL;

    /* first we read the mbox descriptor */
    wl1251_mem_read(wl, wl->mbox_ptr[mbox_num], &mbox,
                sizeof(struct event_mailbox));

    /* process the descriptor */
    ret = wl1251_event_process(wl, &mbox);
    if (ret < 0)
        return ret;

    /* then we let the firmware know it can go on...*/
    wl1251_reg_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);

    return 0;
}