ps.c

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/*
 * This file is part of wl1251
 *
 * 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 "reg.h"
#include "ps.h"
#include "cmd.h"
#include "io.h"

/* in ms */
#define WL1251_WAKEUP_TIMEOUT 100

void wl1251_elp_work(struct work_struct *work)
{
    struct delayed_work *dwork;
    struct wl1251 *wl;

    dwork = container_of(work, struct delayed_work, work);
    wl = container_of(dwork, struct wl1251, elp_work);

    wl1251_debug(DEBUG_PSM, "elp work");

    mutex_lock(&wl->mutex);

    if (wl->elp || wl->station_mode == STATION_ACTIVE_MODE)
        goto out;

    wl1251_debug(DEBUG_PSM, "chip to elp");
    wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
    wl->elp = true;

out:
    mutex_unlock(&wl->mutex);
}

#define ELP_ENTRY_DELAY  5

/* Routines to toggle sleep mode while in ELP */
void wl1251_ps_elp_sleep(struct wl1251 *wl)
{
    unsigned long delay;

    if (wl->station_mode != STATION_ACTIVE_MODE) {
        delay = msecs_to_jiffies(ELP_ENTRY_DELAY);
        ieee80211_queue_delayed_work(wl->hw, &wl->elp_work, delay);
    }
}

int wl1251_ps_elp_wakeup(struct wl1251 *wl)
{
    unsigned long timeout, start;
    u32 elp_reg;

    if (delayed_work_pending(&wl->elp_work))
        cancel_delayed_work(&wl->elp_work);

    if (!wl->elp)
        return 0;

    wl1251_debug(DEBUG_PSM, "waking up chip from elp");

    start = jiffies;
    timeout = jiffies + msecs_to_jiffies(WL1251_WAKEUP_TIMEOUT);

    wl1251_write_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);

    elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);

    /*
     * FIXME: we should wait for irq from chip but, as a temporary
     * solution to simplify locking, let's poll instead
     */
    while (!(elp_reg & ELPCTRL_WLAN_READY)) {
        if (time_after(jiffies, timeout)) {
            wl1251_error("elp wakeup timeout");
            return -ETIMEDOUT;
        }
        msleep(1);
        elp_reg = wl1251_read_elp(wl, HW_ACCESS_ELP_CTRL_REG_ADDR);
    }

    wl1251_debug(DEBUG_PSM, "wakeup time: %u ms",
             jiffies_to_msecs(jiffies - start));

    wl->elp = false;

    return 0;
}

int wl1251_ps_set_mode(struct wl1251 *wl, enum wl1251_station_mode mode)
{
    int ret;

    switch (mode) {
    case STATION_POWER_SAVE_MODE:
        wl1251_debug(DEBUG_PSM, "entering psm");

        /* enable beacon filtering */
        ret = wl1251_acx_beacon_filter_opt(wl, true);
        if (ret < 0)
            return ret;

        ret = wl1251_acx_wake_up_conditions(wl,
                            WAKE_UP_EVENT_DTIM_BITMAP,
                            wl->listen_int);
        if (ret < 0)
            return ret;

        ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_ENABLE,
                        WL1251_DEFAULT_BET_CONSECUTIVE);
        if (ret < 0)
            return ret;

        ret = wl1251_cmd_ps_mode(wl, CHIP_POWER_SAVE_MODE);
        if (ret < 0)
            return ret;

        ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
        if (ret < 0)
            return ret;
        break;
    case STATION_IDLE:
        wl1251_debug(DEBUG_PSM, "entering idle");

        ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_ELP);
        if (ret < 0)
            return ret;

        ret = wl1251_cmd_template_set(wl, CMD_DISCONNECT, NULL, 0);
        if (ret < 0)
            return ret;
        break;
    case STATION_ACTIVE_MODE:
    default:
        wl1251_debug(DEBUG_PSM, "leaving psm");

        ret = wl1251_acx_sleep_auth(wl, WL1251_PSM_CAM);
        if (ret < 0)
            return ret;

        /* disable BET */
        ret = wl1251_acx_bet_enable(wl, WL1251_ACX_BET_DISABLE,
                        WL1251_DEFAULT_BET_CONSECUTIVE);
        if (ret < 0)
            return ret;

        /* disable beacon filtering */
        ret = wl1251_acx_beacon_filter_opt(wl, false);
        if (ret < 0)
            return ret;

        ret = wl1251_acx_wake_up_conditions(wl,
                            WAKE_UP_EVENT_DTIM_BITMAP,
                            wl->listen_int);
        if (ret < 0)
            return ret;

        ret = wl1251_cmd_ps_mode(wl, CHIP_ACTIVE_MODE);
        if (ret < 0)
            return ret;

        break;
    }
    wl->station_mode = mode;

    return ret;
}