LXR linux/drivers/net/wireless/rt2x00/rt2x00config.c

   1/*
   2        Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   3        <http://rt2x00.serialmonkey.com>
   4
   5        This program is free software; you can redistribute it and/or modify
   6        it under the terms of the GNU General Public License as published by
   7        the Free Software Foundation; either version 2 of the License, or
   8        (at your option) any later version.
   9
  10        This program is distributed in the hope that it will be useful,
  11        but WITHOUT ANY WARRANTY; without even the implied warranty of
  12        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13        GNU General Public License for more details.
  14
  15        You should have received a copy of the GNU General Public License
  16        along with this program; if not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19/*
  20        Module: rt2x00lib
  21        Abstract: rt2x00 generic configuration routines.
  22 */
  23
  24#include <linux/kernel.h>
  25#include <linux/module.h>
  26
  27#include "rt2x00.h"
  28#include "rt2x00lib.h"
  29
  30void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
  31                           struct rt2x00_intf *intf,
  32                           enum nl80211_iftype type,
  33                           const u8 *mac, const u8 *bssid)
  34{
  35        struct rt2x00intf_conf conf;
  36        unsigned int flags = 0;
  37
  38        conf.type = type;
  39
  40        switch (type) {
  41        case NL80211_IFTYPE_ADHOC:
  42                conf.sync = TSF_SYNC_ADHOC;
  43                break;
  44        case NL80211_IFTYPE_AP:
  45        case NL80211_IFTYPE_MESH_POINT:
  46        case NL80211_IFTYPE_WDS:
  47                conf.sync = TSF_SYNC_AP_NONE;
  48                break;
  49        case NL80211_IFTYPE_STATION:
  50                conf.sync = TSF_SYNC_INFRA;
  51                break;
  52        default:
  53                conf.sync = TSF_SYNC_NONE;
  54                break;
  55        }
  56
  57        /*
  58         * Note that when NULL is passed as address we will send
  59         * 00:00:00:00:00 to the device to clear the address.
  60         * This will prevent the device being confused when it wants
  61         * to ACK frames or considers itself associated.
  62         */
  63        memset(conf.mac, 0, sizeof(conf.mac));
  64        if (mac)
  65                memcpy(conf.mac, mac, ETH_ALEN);
  66
  67        memset(conf.bssid, 0, sizeof(conf.bssid));
  68        if (bssid)
  69                memcpy(conf.bssid, bssid, ETH_ALEN);
  70
  71        flags |= CONFIG_UPDATE_TYPE;
  72        if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  73                flags |= CONFIG_UPDATE_MAC;
  74        if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  75                flags |= CONFIG_UPDATE_BSSID;
  76
  77        rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
  78}
  79
  80void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
  81                          struct rt2x00_intf *intf,
  82                          struct ieee80211_bss_conf *bss_conf,
  83                          u32 changed)
  84{
  85        struct rt2x00lib_erp erp;
  86
  87        memset(&erp, 0, sizeof(erp));
  88
  89        erp.short_preamble = bss_conf->use_short_preamble;
  90        erp.cts_protection = bss_conf->use_cts_prot;
  91
  92        erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
  93        erp.sifs = SIFS;
  94        erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
  95        erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
  96        erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
  97
  98        erp.basic_rates = bss_conf->basic_rates;
  99        erp.beacon_int = bss_conf->beacon_int;
 100
 101        /* Update the AID, this is needed for dynamic PS support */
 102        rt2x00dev->aid = bss_conf->assoc ? bss_conf->aid : 0;
 103        rt2x00dev->last_beacon = bss_conf->sync_tsf;
 104
 105        /* Update global beacon interval time, this is needed for PS support */
 106        rt2x00dev->beacon_int = bss_conf->beacon_int;
 107
 108        if (changed & BSS_CHANGED_HT)
 109                erp.ht_opmode = bss_conf->ht_operation_mode;
 110
 111        rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp, changed);
 112}
 113
 114void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 115                              struct antenna_setup config)
 116{
 117        struct link_ant *ant = &rt2x00dev->link.ant;
 118        struct antenna_setup *def = &rt2x00dev->default_ant;
 119        struct antenna_setup *active = &rt2x00dev->link.ant.active;
 120
 121        /*
 122         * When the caller tries to send the SW diversity,
 123         * we must update the ANTENNA_RX_DIVERSITY flag to
 124         * enable the antenna diversity in the link tuner.
 125         *
 126         * Secondly, we must guarentee we never send the
 127         * software antenna diversity command to the driver.
 128         */
 129        if (!(ant->flags & ANTENNA_RX_DIVERSITY)) {
 130                if (config.rx == ANTENNA_SW_DIVERSITY) {
 131                        ant->flags |= ANTENNA_RX_DIVERSITY;
 132
 133                        if (def->rx == ANTENNA_SW_DIVERSITY)
 134                                config.rx = ANTENNA_B;
 135                        else
 136                                config.rx = def->rx;
 137                }
 138        } else if (config.rx == ANTENNA_SW_DIVERSITY)
 139                config.rx = active->rx;
 140
 141        if (!(ant->flags & ANTENNA_TX_DIVERSITY)) {
 142                if (config.tx == ANTENNA_SW_DIVERSITY) {
 143                        ant->flags |= ANTENNA_TX_DIVERSITY;
 144
 145                        if (def->tx == ANTENNA_SW_DIVERSITY)
 146                                config.tx = ANTENNA_B;
 147                        else
 148                                config.tx = def->tx;
 149                }
 150        } else if (config.tx == ANTENNA_SW_DIVERSITY)
 151                config.tx = active->tx;
 152
 153        /*
 154         * Antenna setup changes require the RX to be disabled,
 155         * else the changes will be ignored by the device.
 156         */
 157        if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 158                rt2x00queue_stop_queue(rt2x00dev->rx);
 159
 160        /*
 161         * Write new antenna setup to device and reset the link tuner.
 162         * The latter is required since we need to recalibrate the
 163         * noise-sensitivity ratio for the new setup.
 164         */
 165        rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);
 166
 167        rt2x00link_reset_tuner(rt2x00dev, true);
 168
 169        memcpy(active, &config, sizeof(config));
 170
 171        if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 172                rt2x00queue_start_queue(rt2x00dev->rx);
 173}
 174
 175static u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
 176                                   struct ieee80211_conf *conf)
 177{
 178        struct hw_mode_spec *spec = &rt2x00dev->spec;
 179        int center_channel;
 180        u16 i;
 181
 182        /*
 183         * Initialize center channel to current channel.
 184         */
 185        center_channel = spec->channels[conf->chandef.chan->hw_value].channel;
 186
 187        /*
 188         * Adjust center channel to HT40+ and HT40- operation.
 189         */
 190        if (conf_is_ht40_plus(conf))
 191                center_channel += 2;
 192        else if (conf_is_ht40_minus(conf))
 193                center_channel -= (center_channel == 14) ? 1 : 2;
 194
 195        for (i = 0; i < spec->num_channels; i++)
 196                if (spec->channels[i].channel == center_channel)
 197                        return i;
 198
 199        WARN_ON(1);
 200        return conf->chandef.chan->hw_value;
 201}
 202
 203void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 204                      struct ieee80211_conf *conf,
 205                      unsigned int ieee80211_flags)
 206{
 207        struct rt2x00lib_conf libconf;
 208        u16 hw_value;
 209        u16 autowake_timeout;
 210        u16 beacon_int;
 211        u16 beacon_diff;
 212
 213        memset(&libconf, 0, sizeof(libconf));
 214
 215        libconf.conf = conf;
 216
 217        if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
 218                if (!conf_is_ht(conf))
 219                        set_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
 220                else
 221                        clear_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
 222
 223                if (conf_is_ht40(conf)) {
 224                        set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
 225                        hw_value = rt2x00ht_center_channel(rt2x00dev, conf);
 226                } else {
 227                        clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
 228                        hw_value = conf->chandef.chan->hw_value;
 229                }
 230
 231                memcpy(&libconf.rf,
 232                       &rt2x00dev->spec.channels[hw_value],
 233                       sizeof(libconf.rf));
 234
 235                memcpy(&libconf.channel,
 236                       &rt2x00dev->spec.channels_info[hw_value],
 237                       sizeof(libconf.channel));
 238
 239                /* Used for VCO periodic calibration */
 240                rt2x00dev->rf_channel = libconf.rf.channel;
 241        }
 242
 243        if (rt2x00_has_cap_flag(rt2x00dev, REQUIRE_PS_AUTOWAKE) &&
 244            (ieee80211_flags & IEEE80211_CONF_CHANGE_PS))
 245                cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
 246
 247        /*
 248         * Start configuration.
 249         */
 250        rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
 251
 252        /*
 253         * Some configuration changes affect the link quality
 254         * which means we need to reset the link tuner.
 255         */
 256        if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
 257                rt2x00link_reset_tuner(rt2x00dev, false);
 258
 259        if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 260            rt2x00_has_cap_flag(rt2x00dev, REQUIRE_PS_AUTOWAKE) &&
 261            (ieee80211_flags & IEEE80211_CONF_CHANGE_PS) &&
 262            (conf->flags & IEEE80211_CONF_PS)) {
 263                beacon_diff = (long)jiffies - (long)rt2x00dev->last_beacon;
 264                beacon_int = msecs_to_jiffies(rt2x00dev->beacon_int);
 265
 266                if (beacon_diff > beacon_int)
 267                        beacon_diff = 0;
 268
 269                autowake_timeout = (conf->ps_dtim_period * beacon_int) - beacon_diff;
 270                queue_delayed_work(rt2x00dev->workqueue,
 271                                   &rt2x00dev->autowakeup_work,
 272                                   autowake_timeout - 15);
 273        }
 274
 275        if (conf->flags & IEEE80211_CONF_PS)
 276                set_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 277        else
 278                clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 279
 280        rt2x00dev->curr_band = conf->chandef.chan->band;
 281        rt2x00dev->curr_freq = conf->chandef.chan->center_freq;
 282        rt2x00dev->tx_power = conf->power_level;
 283        rt2x00dev->short_retry = conf->short_frame_max_tx_count;
 284        rt2x00dev->long_retry = conf->long_frame_max_tx_count;
 285}
 286