rt2x00config.c

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/*
    Copyright (C) 2004 - 2009 Ivo van Doorn <[email protected]>
    <http://rt2x00.serialmonkey.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    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.,
    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
    Module: rt2x00lib
    Abstract: rt2x00 generic configuration routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include "rt2x00.h"
#include "rt2x00lib.h"

void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
               struct rt2x00_intf *intf,
               enum nl80211_iftype type,
               const u8 *mac, const u8 *bssid)
{
    struct rt2x00intf_conf conf;
    unsigned int flags = 0;

    conf.type = type;

    switch (type) {
    case NL80211_IFTYPE_ADHOC:
        conf.sync = TSF_SYNC_ADHOC;
        break;
    case NL80211_IFTYPE_AP:
    case NL80211_IFTYPE_MESH_POINT:
    case NL80211_IFTYPE_WDS:
        conf.sync = TSF_SYNC_AP_NONE;
        break;
    case NL80211_IFTYPE_STATION:
        conf.sync = TSF_SYNC_INFRA;
        break;
    default:
        conf.sync = TSF_SYNC_NONE;
        break;
    }

    /*
     * Note that when NULL is passed as address we will send
     * 00:00:00:00:00 to the device to clear the address.
     * This will prevent the device being confused when it wants
     * to ACK frames or considers itself associated.
     */
    memset(conf.mac, 0, sizeof(conf.mac));
    if (mac)
        memcpy(conf.mac, mac, ETH_ALEN);

    memset(conf.bssid, 0, sizeof(conf.bssid));
    if (bssid)
        memcpy(conf.bssid, bssid, ETH_ALEN);

    flags |= CONFIG_UPDATE_TYPE;
    if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
        flags |= CONFIG_UPDATE_MAC;
    if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
        flags |= CONFIG_UPDATE_BSSID;

    rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
}

void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
              struct rt2x00_intf *intf,
              struct ieee80211_bss_conf *bss_conf,
              u32 changed)
{
    struct rt2x00lib_erp erp;

    memset(&erp, 0, sizeof(erp));

    erp.short_preamble = bss_conf->use_short_preamble;
    erp.cts_protection = bss_conf->use_cts_prot;

    erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
    erp.sifs = SIFS;
    erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
    erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
    erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;

    erp.basic_rates = bss_conf->basic_rates;
    erp.beacon_int = bss_conf->beacon_int;

    /* Update the AID, this is needed for dynamic PS support */
    rt2x00dev->aid = bss_conf->assoc ? bss_conf->aid : 0;
    rt2x00dev->last_beacon = bss_conf->sync_tsf;

    /* Update global beacon interval time, this is needed for PS support */
    rt2x00dev->beacon_int = bss_conf->beacon_int;

    if (changed & BSS_CHANGED_HT)
        erp.ht_opmode = bss_conf->ht_operation_mode;

    rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp, changed);
}

void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
                  struct antenna_setup config)
{
    struct link_ant *ant = &rt2x00dev->link.ant;
    struct antenna_setup *def = &rt2x00dev->default_ant;
    struct antenna_setup *active = &rt2x00dev->link.ant.active;

    /*
     * When the caller tries to send the SW diversity,
     * we must update the ANTENNA_RX_DIVERSITY flag to
     * enable the antenna diversity in the link tuner.
     *
     * Secondly, we must guarentee we never send the
     * software antenna diversity command to the driver.
     */
    if (!(ant->flags & ANTENNA_RX_DIVERSITY)) {
        if (config.rx == ANTENNA_SW_DIVERSITY) {
            ant->flags |= ANTENNA_RX_DIVERSITY;

            if (def->rx == ANTENNA_SW_DIVERSITY)
                config.rx = ANTENNA_B;
            else
                config.rx = def->rx;
        }
    } else if (config.rx == ANTENNA_SW_DIVERSITY)
        config.rx = active->rx;

    if (!(ant->flags & ANTENNA_TX_DIVERSITY)) {
        if (config.tx == ANTENNA_SW_DIVERSITY) {
            ant->flags |= ANTENNA_TX_DIVERSITY;

            if (def->tx == ANTENNA_SW_DIVERSITY)
                config.tx = ANTENNA_B;
            else
                config.tx = def->tx;
        }
    } else if (config.tx == ANTENNA_SW_DIVERSITY)
        config.tx = active->tx;

    /*
     * Antenna setup changes require the RX to be disabled,
     * else the changes will be ignored by the device.
     */
    if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
        rt2x00queue_stop_queue(rt2x00dev->rx);

    /*
     * Write new antenna setup to device and reset the link tuner.
     * The latter is required since we need to recalibrate the
     * noise-sensitivity ratio for the new setup.
     */
    rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);

    rt2x00link_reset_tuner(rt2x00dev, true);

    memcpy(active, &config, sizeof(config));

    if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
        rt2x00queue_start_queue(rt2x00dev->rx);
}

static u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
                   struct ieee80211_conf *conf)
{
    struct hw_mode_spec *spec = &rt2x00dev->spec;
    int center_channel;
    u16 i;

    /*
     * Initialize center channel to current channel.
     */
    center_channel = spec->channels[conf->channel->hw_value].channel;

    /*
     * Adjust center channel to HT40+ and HT40- operation.
     */
    if (conf_is_ht40_plus(conf))
        center_channel += 2;
    else if (conf_is_ht40_minus(conf))
        center_channel -= (center_channel == 14) ? 1 : 2;

    for (i = 0; i < spec->num_channels; i++)
        if (spec->channels[i].channel == center_channel)
            return i;

    WARN_ON(1);
    return conf->channel->hw_value;
}

void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
              struct ieee80211_conf *conf,
              unsigned int ieee80211_flags)
{
    struct rt2x00lib_conf libconf;
    u16 hw_value;
    u16 autowake_timeout;
    u16 beacon_int;
    u16 beacon_diff;

    memset(&libconf, 0, sizeof(libconf));

    libconf.conf = conf;

    if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
        if (!conf_is_ht(conf))
            set_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
        else
            clear_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);

        if (conf_is_ht40(conf)) {
            set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
            hw_value = rt2x00ht_center_channel(rt2x00dev, conf);
        } else {
            clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
            hw_value = conf->channel->hw_value;
        }

        memcpy(&libconf.rf,
               &rt2x00dev->spec.channels[hw_value],
               sizeof(libconf.rf));

        memcpy(&libconf.channel,
               &rt2x00dev->spec.channels_info[hw_value],
               sizeof(libconf.channel));

        /* Used for VCO periodic calibration */
        rt2x00dev->rf_channel = libconf.rf.channel;
    }

    if (test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
        (ieee80211_flags & IEEE80211_CONF_CHANGE_PS))
        cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);

    /*
     * Start configuration.
     */
    rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);

    /*
     * Some configuration changes affect the link quality
     * which means we need to reset the link tuner.
     */
    if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
        rt2x00link_reset_tuner(rt2x00dev, false);

    if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
        test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
        (ieee80211_flags & IEEE80211_CONF_CHANGE_PS) &&
        (conf->flags & IEEE80211_CONF_PS)) {
        beacon_diff = (long)jiffies - (long)rt2x00dev->last_beacon;
        beacon_int = msecs_to_jiffies(rt2x00dev->beacon_int);

        if (beacon_diff > beacon_int)
            beacon_diff = 0;

        autowake_timeout = (conf->max_sleep_period * beacon_int) - beacon_diff;
        queue_delayed_work(rt2x00dev->workqueue,
                   &rt2x00dev->autowakeup_work,
                   autowake_timeout - 15);
    }

    if (conf->flags & IEEE80211_CONF_PS)
        set_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
    else
        clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);

    rt2x00dev->curr_band = conf->channel->band;
    rt2x00dev->curr_freq = conf->channel->center_freq;
    rt2x00dev->tx_power = conf->power_level;
    rt2x00dev->short_retry = conf->short_frame_max_tx_count;
    rt2x00dev->long_retry = conf->long_frame_max_tx_count;
}