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         rt2x00_reset_link_ant_rssi(&rt2x00dev->link);
 133
 134         rt2x00dev->link.ant.active.rx = libconf.ant.rx;
 135         rt2x00dev->link.ant.active.tx = libconf.ant.tx;
 136
 137         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 138                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
 139 }
 140
 141 static u32 rt2x00lib_get_basic_rates(struct ieee80211_supported_band *band)
 142 {
 143         const struct rt2x00_rate *rate;
 144         unsigned int i;
 145         u32 mask = 0;
 146
 147         for (i = 0; i < band->n_bitrates; i++) {
 148                 rate = rt2x00_get_rate(band->bitrates[i].hw_value);
 149                 if (rate->flags & DEV_RATE_BASIC)
 150                         mask |= rate->ratemask;
 151         }
 152
 153         return mask;
 154 }
 155
 156 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 157                       struct ieee80211_conf *conf, const int force_config)
 158 {
 159         struct rt2x00lib_conf libconf;
 160         struct ieee80211_supported_band *band;
 161         struct antenna_setup *default_ant = &rt2x00dev->default_ant;
 162         struct antenna_setup *active_ant = &rt2x00dev->link.ant.active;
 163         int flags = 0;
 164         int short_slot_time;
 165
 166         /*
 167          * In some situations we want to force all configurations
 168          * to be reloaded (When resuming for instance).
 169          */
 170         if (force_config) {
 171                 flags = CONFIG_UPDATE_ALL;
 172                 goto config;
 173         }
 174
 175         /*
 176          * Check which configuration options have been
 177          * updated and should be send to the device.
 178          */
 179         if (rt2x00dev->rx_status.band != conf->channel->band)
 180                 flags |= CONFIG_UPDATE_PHYMODE;
 181         if (rt2x00dev->rx_status.freq != conf->channel->center_freq)
 182                 flags |= CONFIG_UPDATE_CHANNEL;
 183         if (rt2x00dev->tx_power != conf->power_level)
 184                 flags |= CONFIG_UPDATE_TXPOWER;
 185
 186         /*
 187          * Determining changes in the antenna setups request several checks:
 188          * antenna_sel_{r,t}x = 0
 189          *    -> Does active_{r,t}x match default_{r,t}x
 190          *    -> Is default_{r,t}x SW_DIVERSITY
 191          * antenna_sel_{r,t}x = 1/2
 192          *    -> Does active_{r,t}x match antenna_sel_{r,t}x
 193          * The reason for not updating the antenna while SW diversity
 194          * should be used is simple: Software diversity means that
 195          * we should switch between the antenna's based on the
 196          * quality. This means that the current antenna is good enough
 197          * to work with untill the link tuner decides that an antenna
 198          * switch should be performed.
 199          */
 200         if (!conf->antenna_sel_rx &&
 201             default_ant->rx != ANTENNA_SW_DIVERSITY &&
 202             default_ant->rx != active_ant->rx)
 203                 flags |= CONFIG_UPDATE_ANTENNA;
 204         else if (conf->antenna_sel_rx &&
 205                  conf->antenna_sel_rx != active_ant->rx)
 206                 flags |= CONFIG_UPDATE_ANTENNA;
 207         else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 208                 flags |= CONFIG_UPDATE_ANTENNA;
 209
 210         if (!conf->antenna_sel_tx &&
 211             default_ant->tx != ANTENNA_SW_DIVERSITY &&
 212             default_ant->tx != active_ant->tx)
 213                 flags |= CONFIG_UPDATE_ANTENNA;
 214         else if (conf->antenna_sel_tx &&
 215                  conf->antenna_sel_tx != active_ant->tx)
 216                 flags |= CONFIG_UPDATE_ANTENNA;
 217         else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 218                 flags |= CONFIG_UPDATE_ANTENNA;
 219
 220         /*
 221          * The following configuration options are never
 222          * stored anywhere and will always be updated.
 223          */
 224         flags |= CONFIG_UPDATE_SLOT_TIME;
 225         flags |= CONFIG_UPDATE_BEACON_INT;
 226
 227         /*
 228          * We have determined what options should be updated,
 229          * now precalculate device configuration values depending
 230          * on what configuration options need to be updated.
 231          */
 232 config:
 233         memset(&libconf, 0, sizeof(libconf));
 234
 235         if (flags & CONFIG_UPDATE_PHYMODE) {
 236                 band = &rt2x00dev->bands[conf->channel->band];
 237
 238                 libconf.band = conf->channel->band;
 239                 libconf.basic_rates = rt2x00lib_get_basic_rates(band);
 240         }
 241
 242         if (flags & CONFIG_UPDATE_CHANNEL) {
 243                 memcpy(&libconf.rf,
 244                        &rt2x00dev->spec.channels[conf->channel->hw_value],
 245                        sizeof(libconf.rf));
 246         }
 247
 248         if (flags & CONFIG_UPDATE_ANTENNA) {
 249                 if (conf->antenna_sel_rx)
 250                         libconf.ant.rx = conf->antenna_sel_rx;
 251                 else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
 252                         libconf.ant.rx = default_ant->rx;
 253                 else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 254                         libconf.ant.rx = ANTENNA_B;
 255
 256                 if (conf->antenna_sel_tx)
 257                         libconf.ant.tx = conf->antenna_sel_tx;
 258                 else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
 259                         libconf.ant.tx = default_ant->tx;
 260                 else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 261                         libconf.ant.tx = ANTENNA_B;
 262         }
 263
 264         if (flags & CONFIG_UPDATE_SLOT_TIME) {
 265                 short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;
 266
 267                 libconf.slot_time =
 268                     short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
 269                 libconf.sifs = SIFS;
 270                 libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
 271                 libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
 272                 libconf.eifs = EIFS;
 273         }
 274
 275         libconf.conf = conf;
 276
 277         /*
 278          * Start configuration.
 279          */
 280         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, flags);
 281
 282         /*
 283          * Some configuration changes affect the link quality
 284          * which means we need to reset the link tuner.
 285          */
 286         if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
 287                 rt2x00lib_reset_link_tuner(rt2x00dev);
 288
 289         if (flags & CONFIG_UPDATE_PHYMODE) {
 290                 rt2x00dev->curr_band = conf->channel->band;
 291                 rt2x00dev->rx_status.band = conf->channel->band;
 292         }
 293
 294         rt2x00dev->rx_status.freq = conf->channel->center_freq;
 295         rt2x00dev->tx_power = conf->power_level;
 296
 297         if (flags & CONFIG_UPDATE_ANTENNA) {
 298                 rt2x00dev->link.ant.active.rx = libconf.ant.rx;
 299                 rt2x00dev->link.ant.active.tx = libconf.ant.tx;
 300         }
 301 }