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, write to the
  17         Free Software Foundation, Inc.,
  18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22         Module: rt2x00lib
  23         Abstract: rt2x00 generic configuration routines.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28
  29 #include "rt2x00.h"
  30 #include "rt2x00lib.h"
  31
  32 void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
  33                            struct rt2x00_intf *intf,
  34                            enum nl80211_iftype type,
  35                            const u8 *mac, const u8 *bssid)
  36 {
  37         struct rt2x00intf_conf conf;
  38         unsigned int flags = 0;
  39
  40         conf.type = type;
  41
  42         switch (type) {
  43         case NL80211_IFTYPE_ADHOC:
  44                 conf.sync = TSF_SYNC_ADHOC;
  45                 break;
  46         case NL80211_IFTYPE_AP:
  47         case NL80211_IFTYPE_MESH_POINT:
  48         case NL80211_IFTYPE_WDS:
  49                 conf.sync = TSF_SYNC_AP_NONE;
  50                 break;
  51         case NL80211_IFTYPE_STATION:
  52                 conf.sync = TSF_SYNC_INFRA;
  53                 break;
  54         default:
  55                 conf.sync = TSF_SYNC_NONE;
  56                 break;
  57         }
  58
  59         /*
  60          * Note that when NULL is passed as address we will send
  61          * 00:00:00:00:00 to the device to clear the address.
  62          * This will prevent the device being confused when it wants
  63          * to ACK frames or considers itself associated.
  64          */
  65         memset(conf.mac, 0, sizeof(conf.mac));
  66         if (mac)
  67                 memcpy(conf.mac, mac, ETH_ALEN);
  68
  69         memset(conf.bssid, 0, sizeof(conf.bssid));
  70         if (bssid)
  71                 memcpy(conf.bssid, bssid, ETH_ALEN);
  72
  73         flags |= CONFIG_UPDATE_TYPE;
  74         if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  75                 flags |= CONFIG_UPDATE_MAC;
  76         if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  77                 flags |= CONFIG_UPDATE_BSSID;
  78
  79         rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
  80 }
  81
  82 void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
  83                           struct rt2x00_intf *intf,
  84                           struct ieee80211_bss_conf *bss_conf,
  85                           u32 changed)
  86 {
  87         struct rt2x00lib_erp erp;
  88
  89         memset(&erp, 0, sizeof(erp));
  90
  91         erp.short_preamble = bss_conf->use_short_preamble;
  92         erp.cts_protection = bss_conf->use_cts_prot;
  93
  94         erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
  95         erp.sifs = SIFS;
  96         erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
  97         erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
  98         erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
  99
 100         erp.basic_rates = bss_conf->basic_rates;
 101         erp.beacon_int = bss_conf->beacon_int;
 102
 103         /* Update the AID, this is needed for dynamic PS support */
 104         rt2x00dev->aid = bss_conf->assoc ? bss_conf->aid : 0;
 105         rt2x00dev->last_beacon = bss_conf->last_tsf;
 106
 107         /* Update global beacon interval time, this is needed for PS support */
 108         rt2x00dev->beacon_int = bss_conf->beacon_int;
 109
 110         if (changed & BSS_CHANGED_HT)
 111                 erp.ht_opmode = bss_conf->ht_operation_mode;
 112
 113         rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp, changed);
 114 }
 115
 116 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 117                               struct antenna_setup config)
 118 {
 119         struct link_ant *ant = &rt2x00dev->link.ant;
 120         struct antenna_setup *def = &rt2x00dev->default_ant;
 121         struct antenna_setup *active = &rt2x00dev->link.ant.active;
 122
 123         /*
 124          * When the caller tries to send the SW diversity,
 125          * we must update the ANTENNA_RX_DIVERSITY flag to
 126          * enable the antenna diversity in the link tuner.
 127          *
 128          * Secondly, we must guarentee we never send the
 129          * software antenna diversity command to the driver.
 130          */
 131         if (!(ant->flags & ANTENNA_RX_DIVERSITY)) {
 132                 if (config.rx == ANTENNA_SW_DIVERSITY) {
 133                         ant->flags |= ANTENNA_RX_DIVERSITY;
 134
 135                         if (def->rx == ANTENNA_SW_DIVERSITY)
 136                                 config.rx = ANTENNA_B;
 137                         else
 138                                 config.rx = def->rx;
 139                 }
 140         } else if (config.rx == ANTENNA_SW_DIVERSITY)
 141                 config.rx = active->rx;
 142
 143         if (!(ant->flags & ANTENNA_TX_DIVERSITY)) {
 144                 if (config.tx == ANTENNA_SW_DIVERSITY) {
 145                         ant->flags |= ANTENNA_TX_DIVERSITY;
 146
 147                         if (def->tx == ANTENNA_SW_DIVERSITY)
 148                                 config.tx = ANTENNA_B;
 149                         else
 150                                 config.tx = def->tx;
 151                 }
 152         } else if (config.tx == ANTENNA_SW_DIVERSITY)
 153                 config.tx = active->tx;
 154
 155         /*
 156          * Antenna setup changes require the RX to be disabled,
 157          * else the changes will be ignored by the device.
 158          */
 159         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 160                 rt2x00queue_stop_queue(rt2x00dev->rx);
 161
 162         /*
 163          * Write new antenna setup to device and reset the link tuner.
 164          * The latter is required since we need to recalibrate the
 165          * noise-sensitivity ratio for the new setup.
 166          */
 167         rt2x00dev->ops->lib->config_ant(rt2x00dev, &config);
 168
 169         rt2x00link_reset_tuner(rt2x00dev, true);
 170
 171         memcpy(active, &config, sizeof(config));
 172
 173         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 174                 rt2x00queue_start_queue(rt2x00dev->rx);
 175 }
 176
 177 static u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
 178                                    struct ieee80211_conf *conf)
 179 {
 180         struct hw_mode_spec *spec = &rt2x00dev->spec;
 181         int center_channel;
 182         u16 i;
 183
 184         /*
 185          * Initialize center channel to current channel.
 186          */
 187         center_channel = spec->channels[conf->channel->hw_value].channel;
 188
 189         /*
 190          * Adjust center channel to HT40+ and HT40- operation.
 191          */
 192         if (conf_is_ht40_plus(conf))
 193                 center_channel += 2;
 194         else if (conf_is_ht40_minus(conf))
 195                 center_channel -= (center_channel == 14) ? 1 : 2;
 196
 197         for (i = 0; i < spec->num_channels; i++)
 198                 if (spec->channels[i].channel == center_channel)
 199                         return i;
 200
 201         WARN_ON(1);
 202         return conf->channel->hw_value;
 203 }
 204
 205 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 206                       struct ieee80211_conf *conf,
 207                       unsigned int ieee80211_flags)
 208 {
 209         struct rt2x00lib_conf libconf;
 210         u16 hw_value;
 211         u16 autowake_timeout;
 212         u16 beacon_int;
 213         u16 beacon_diff;
 214
 215         memset(&libconf, 0, sizeof(libconf));
 216
 217         libconf.conf = conf;
 218
 219         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
 220                 if (!conf_is_ht(conf))
 221                         set_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
 222                 else
 223                         clear_bit(CONFIG_HT_DISABLED, &rt2x00dev->flags);
 224
 225                 if (conf_is_ht40(conf)) {
 226                         set_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
 227                         hw_value = rt2x00ht_center_channel(rt2x00dev, conf);
 228                 } else {
 229                         clear_bit(CONFIG_CHANNEL_HT40, &rt2x00dev->flags);
 230                         hw_value = conf->channel->hw_value;
 231                 }
 232
 233                 memcpy(&libconf.rf,
 234                        &rt2x00dev->spec.channels[hw_value],
 235                        sizeof(libconf.rf));
 236
 237                 memcpy(&libconf.channel,
 238                        &rt2x00dev->spec.channels_info[hw_value],
 239                        sizeof(libconf.channel));
 240
 241                 /* Used for VCO periodic calibration */
 242                 rt2x00dev->rf_channel = libconf.rf.channel;
 243         }
 244
 245         if (test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
 246             (ieee80211_flags & IEEE80211_CONF_CHANGE_PS))
 247                 cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
 248
 249         /*
 250          * Start configuration.
 251          */
 252         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
 253
 254         /*
 255          * Some configuration changes affect the link quality
 256          * which means we need to reset the link tuner.
 257          */
 258         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
 259                 rt2x00link_reset_tuner(rt2x00dev, false);
 260
 261         if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
 262             test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
 263             (ieee80211_flags & IEEE80211_CONF_CHANGE_PS) &&
 264             (conf->flags & IEEE80211_CONF_PS)) {
 265                 beacon_diff = (long)jiffies - (long)rt2x00dev->last_beacon;
 266                 beacon_int = msecs_to_jiffies(rt2x00dev->beacon_int);
 267
 268                 if (beacon_diff > beacon_int)
 269                         beacon_diff = 0;
 270
 271                 autowake_timeout = (conf->max_sleep_period * beacon_int) - beacon_diff;
 272                 queue_delayed_work(rt2x00dev->workqueue,
 273                                    &rt2x00dev->autowakeup_work,
 274                                    autowake_timeout - 15);
 275         }
 276
 277         if (conf->flags & IEEE80211_CONF_PS)
 278                 set_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 279         else
 280                 clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
 281
 282         rt2x00dev->curr_band = conf->channel->band;
 283         rt2x00dev->curr_freq = conf->channel->center_freq;
 284         rt2x00dev->tx_power = conf->power_level;
 285         rt2x00dev->short_retry = conf->short_frame_max_tx_count;
 286         rt2x00dev->long_retry = conf->long_frame_max_tx_count;
 287 }