drivers/net/wireless/rt2x00/rt2x00config.c

   1 /*
   2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
   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 ieee80211_if_types type,
  35                            u8 *mac, u8 *bssid)
  36 {
  37         struct rt2x00intf_conf conf;
  38         unsigned int flags = 0;
  39
  40         conf.type = type;
  41
  42         switch (type) {
  43         case IEEE80211_IF_TYPE_IBSS:
  44         case IEEE80211_IF_TYPE_AP:
  45                 conf.sync = TSF_SYNC_BEACON;
  46                 break;
  47         case IEEE80211_IF_TYPE_STA:
  48                 conf.sync = TSF_SYNC_INFRA;
  49                 break;
  50         default:
  51                 conf.sync = TSF_SYNC_NONE;
  52                 break;
  53         }
  54
  55         /*
  56          * Note that when NULL is passed as address we will send
  57          * 00:00:00:00:00 to the device to clear the address.
  58          * This will prevent the device being confused when it wants
  59          * to ACK frames or consideres itself associated.
  60          */
  61         memset(&conf.mac, 0, sizeof(conf.mac));
  62         if (mac)
  63                 memcpy(&conf.mac, mac, ETH_ALEN);
  64
  65         memset(&conf.bssid, 0, sizeof(conf.bssid));
  66         if (bssid)
  67                 memcpy(&conf.bssid, bssid, ETH_ALEN);
  68
  69         flags |= CONFIG_UPDATE_TYPE;
  70         if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  71                 flags |= CONFIG_UPDATE_MAC;
  72         if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  73                 flags |= CONFIG_UPDATE_BSSID;
  74
  75         rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
  76 }
  77
  78 void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
  79                           struct rt2x00_intf *intf,
  80                           struct ieee80211_bss_conf *bss_conf)
  81 {
  82         struct rt2x00lib_erp erp;
  83
  84         memset(&erp, 0, sizeof(erp));
  85
  86         erp.short_preamble = bss_conf->use_short_preamble;
  87         erp.ack_timeout = PLCP + get_duration(ACK_SIZE, 10);
  88         erp.ack_consume_time = SIFS + PLCP + get_duration(ACK_SIZE, 10);
  89
  90         if (rt2x00dev->hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME)
  91                 erp.ack_timeout += SHORT_DIFS;
  92         else
  93                 erp.ack_timeout += DIFS;
  94
  95         if (bss_conf->use_short_preamble) {
  96                 erp.ack_timeout += SHORT_PREAMBLE;
  97                 erp.ack_consume_time += SHORT_PREAMBLE;
  98         } else {
  99                 erp.ack_timeout += PREAMBLE;
 100                 erp.ack_consume_time += PREAMBLE;
 101         }
 102
 103         rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);
 104 }
 105
 106 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 107                               enum antenna rx, enum antenna tx)
 108 {
 109         struct rt2x00lib_conf libconf;
 110
 111         libconf.ant.rx = rx;
 112         libconf.ant.tx = tx;
 113
 114         if (rx == rt2x00dev->link.ant.active.rx &&
 115             tx == rt2x00dev->link.ant.active.tx)
 116                 return;
 117
 118         /*
 119          * Antenna setup changes require the RX to be disabled,
 120          * else the changes will be ignored by the device.
 121          */
 122         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 123                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);
 124
 125         /*
 126          * Write new antenna setup to device and reset the link tuner.
 127          * The latter is required since we need to recalibrate the
 128          * noise-sensitivity ratio for the new setup.
 129          */
 130         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, CONFIG_UPDATE_ANTENNA);
 131         rt2x00lib_reset_link_tuner(rt2x00dev);
 132
 133         rt2x00dev->link.ant.active.rx = libconf.ant.rx;
 134         rt2x00dev->link.ant.active.tx = libconf.ant.tx;
 135
 136         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 137                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
 138 }
 139
 140 static u32 rt2x00lib_get_basic_rates(struct ieee80211_supported_band *band)
 141 {
 142         const struct rt2x00_rate *rate;
 143         unsigned int i;
 144         u32 mask = 0;
 145
 146         for (i = 0; i < band->n_bitrates; i++) {
 147                 rate = rt2x00_get_rate(band->bitrates[i].hw_value);
 148                 if (rate->flags & DEV_RATE_BASIC)
 149                         mask |= rate->ratemask;
 150         }
 151
 152         return mask;
 153 }
 154
 155 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 156                       struct ieee80211_conf *conf, const int force_config)
 157 {
 158         struct rt2x00lib_conf libconf;
 159         struct ieee80211_supported_band *band;
 160         struct antenna_setup *default_ant = &rt2x00dev->default_ant;
 161         struct antenna_setup *active_ant = &rt2x00dev->link.ant.active;
 162         int flags = 0;
 163         int short_slot_time;
 164
 165         /*
 166          * In some situations we want to force all configurations
 167          * to be reloaded (When resuming for instance).
 168          */
 169         if (force_config) {
 170                 flags = CONFIG_UPDATE_ALL;
 171                 goto config;
 172         }
 173
 174         /*
 175          * Check which configuration options have been
 176          * updated and should be send to the device.
 177          */
 178         if (rt2x00dev->rx_status.band != conf->channel->band)
 179                 flags |= CONFIG_UPDATE_PHYMODE;
 180         if (rt2x00dev->rx_status.freq != conf->channel->center_freq)
 181                 flags |= CONFIG_UPDATE_CHANNEL;
 182         if (rt2x00dev->tx_power != conf->power_level)
 183                 flags |= CONFIG_UPDATE_TXPOWER;
 184
 185         /*
 186          * Determining changes in the antenna setups request several checks:
 187          * antenna_sel_{r,t}x = 0
 188          *    -> Does active_{r,t}x match default_{r,t}x
 189          *    -> Is default_{r,t}x SW_DIVERSITY
 190          * antenna_sel_{r,t}x = 1/2
 191          *    -> Does active_{r,t}x match antenna_sel_{r,t}x
 192          * The reason for not updating the antenna while SW diversity
 193          * should be used is simple: Software diversity means that
 194          * we should switch between the antenna's based on the
 195          * quality. This means that the current antenna is good enough
 196          * to work with untill the link tuner decides that an antenna
 197          * switch should be performed.
 198          */
 199         if (!conf->antenna_sel_rx &&
 200             default_ant->rx != ANTENNA_SW_DIVERSITY &&
 201             default_ant->rx != active_ant->rx)
 202                 flags |= CONFIG_UPDATE_ANTENNA;
 203         else if (conf->antenna_sel_rx &&
 204                  conf->antenna_sel_rx != active_ant->rx)
 205                 flags |= CONFIG_UPDATE_ANTENNA;
 206         else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 207                 flags |= CONFIG_UPDATE_ANTENNA;
 208
 209         if (!conf->antenna_sel_tx &&
 210             default_ant->tx != ANTENNA_SW_DIVERSITY &&
 211             default_ant->tx != active_ant->tx)
 212                 flags |= CONFIG_UPDATE_ANTENNA;
 213         else if (conf->antenna_sel_tx &&
 214                  conf->antenna_sel_tx != active_ant->tx)
 215                 flags |= CONFIG_UPDATE_ANTENNA;
 216         else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 217                 flags |= CONFIG_UPDATE_ANTENNA;
 218
 219         /*
 220          * The following configuration options are never
 221          * stored anywhere and will always be updated.
 222          */
 223         flags |= CONFIG_UPDATE_SLOT_TIME;
 224         flags |= CONFIG_UPDATE_BEACON_INT;
 225
 226         /*
 227          * We have determined what options should be updated,
 228          * now precalculate device configuration values depending
 229          * on what configuration options need to be updated.
 230          */
 231 config:
 232         memset(&libconf, 0, sizeof(libconf));
 233
 234         if (flags & CONFIG_UPDATE_PHYMODE) {
 235                 band = &rt2x00dev->bands[conf->channel->band];
 236
 237                 libconf.band = conf->channel->band;
 238                 libconf.basic_rates = rt2x00lib_get_basic_rates(band);
 239         }
 240
 241         if (flags & CONFIG_UPDATE_CHANNEL) {
 242                 memcpy(&libconf.rf,
 243                        &rt2x00dev->spec.channels[conf->channel->hw_value],
 244                        sizeof(libconf.rf));
 245         }
 246
 247         if (flags & CONFIG_UPDATE_ANTENNA) {
 248                 if (conf->antenna_sel_rx)
 249                         libconf.ant.rx = conf->antenna_sel_rx;
 250                 else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
 251                         libconf.ant.rx = default_ant->rx;
 252                 else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 253                         libconf.ant.rx = ANTENNA_B;
 254
 255                 if (conf->antenna_sel_tx)
 256                         libconf.ant.tx = conf->antenna_sel_tx;
 257                 else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
 258                         libconf.ant.tx = default_ant->tx;
 259                 else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 260                         libconf.ant.tx = ANTENNA_B;
 261         }
 262
 263         if (flags & CONFIG_UPDATE_SLOT_TIME) {
 264                 short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;
 265
 266                 libconf.slot_time =
 267                     short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
 268                 libconf.sifs = SIFS;
 269                 libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
 270                 libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
 271                 libconf.eifs = EIFS;
 272         }
 273
 274         libconf.conf = conf;
 275
 276         /*
 277          * Start configuration.
 278          */
 279         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, flags);
 280
 281         /*
 282          * Some configuration changes affect the link quality
 283          * which means we need to reset the link tuner.
 284          */
 285         if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
 286                 rt2x00lib_reset_link_tuner(rt2x00dev);
 287
 288         if (flags & CONFIG_UPDATE_PHYMODE) {
 289                 rt2x00dev->curr_band = conf->channel->band;
 290                 rt2x00dev->rx_status.band = conf->channel->band;
 291         }
 292
 293         rt2x00dev->rx_status.freq = conf->channel->center_freq;
 294         rt2x00dev->tx_power = conf->power_level;
 295
 296         if (flags & CONFIG_UPDATE_ANTENNA) {
 297                 rt2x00dev->link.ant.active.rx = libconf.ant.rx;
 298                 rt2x00dev->link.ant.active.tx = libconf.ant.tx;
 299         }
 300 }