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         int retval;
  84
  85         memset(&erp, 0, sizeof(erp));
  86
  87         erp.short_preamble = bss_conf->use_short_preamble;
  88         erp.ack_timeout = PLCP + get_duration(ACK_SIZE, 10);
  89         erp.ack_consume_time = SIFS + PLCP + get_duration(ACK_SIZE, 10);
  90
  91         if (rt2x00dev->hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME)
  92                 erp.ack_timeout += SHORT_DIFS;
  93         else
  94                 erp.ack_timeout += DIFS;
  95
  96         if (bss_conf->use_short_preamble) {
  97                 erp.ack_timeout += SHORT_PREAMBLE;
  98                 erp.ack_consume_time += SHORT_PREAMBLE;
  99         } else {
 100                 erp.ack_timeout += PREAMBLE;
 101                 erp.ack_consume_time += PREAMBLE;
 102         }
 103
 104         retval = rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);
 105
 106         if (retval) {
 107                 spin_lock(&intf->lock);
 108                 intf->delayed_flags |= DELAYED_CONFIG_ERP;
 109                 queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 110                 spin_unlock(&intf->lock);
 111         }
 112 }
 113
 114 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 115                               enum antenna rx, enum antenna tx)
 116 {
 117         struct rt2x00lib_conf libconf;
 118
 119         libconf.ant.rx = rx;
 120         libconf.ant.tx = tx;
 121
 122         if (rx == rt2x00dev->link.ant.active.rx &&
 123             tx == rt2x00dev->link.ant.active.tx)
 124                 return;
 125
 126         /*
 127          * Antenna setup changes require the RX to be disabled,
 128          * else the changes will be ignored by the device.
 129          */
 130         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 131                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);
 132
 133         /*
 134          * Write new antenna setup to device and reset the link tuner.
 135          * The latter is required since we need to recalibrate the
 136          * noise-sensitivity ratio for the new setup.
 137          */
 138         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, CONFIG_UPDATE_ANTENNA);
 139         rt2x00lib_reset_link_tuner(rt2x00dev);
 140
 141         rt2x00dev->link.ant.active.rx = libconf.ant.rx;
 142         rt2x00dev->link.ant.active.tx = libconf.ant.tx;
 143
 144         if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 145                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
 146 }
 147
 148 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 149                       struct ieee80211_conf *conf, const int force_config)
 150 {
 151         struct rt2x00lib_conf libconf;
 152         struct ieee80211_supported_band *band;
 153         struct ieee80211_rate *rate;
 154         struct antenna_setup *default_ant = &rt2x00dev->default_ant;
 155         struct antenna_setup *active_ant = &rt2x00dev->link.ant.active;
 156         int flags = 0;
 157         int short_slot_time;
 158
 159         /*
 160          * In some situations we want to force all configurations
 161          * to be reloaded (When resuming for instance).
 162          */
 163         if (force_config) {
 164                 flags = CONFIG_UPDATE_ALL;
 165                 goto config;
 166         }
 167
 168         /*
 169          * Check which configuration options have been
 170          * updated and should be send to the device.
 171          */
 172         if (rt2x00dev->rx_status.band != conf->channel->band)
 173                 flags |= CONFIG_UPDATE_PHYMODE;
 174         if (rt2x00dev->rx_status.freq != conf->channel->center_freq)
 175                 flags |= CONFIG_UPDATE_CHANNEL;
 176         if (rt2x00dev->tx_power != conf->power_level)
 177                 flags |= CONFIG_UPDATE_TXPOWER;
 178
 179         /*
 180          * Determining changes in the antenna setups request several checks:
 181          * antenna_sel_{r,t}x = 0
 182          *    -> Does active_{r,t}x match default_{r,t}x
 183          *    -> Is default_{r,t}x SW_DIVERSITY
 184          * antenna_sel_{r,t}x = 1/2
 185          *    -> Does active_{r,t}x match antenna_sel_{r,t}x
 186          * The reason for not updating the antenna while SW diversity
 187          * should be used is simple: Software diversity means that
 188          * we should switch between the antenna's based on the
 189          * quality. This means that the current antenna is good enough
 190          * to work with untill the link tuner decides that an antenna
 191          * switch should be performed.
 192          */
 193         if (!conf->antenna_sel_rx &&
 194             default_ant->rx != ANTENNA_SW_DIVERSITY &&
 195             default_ant->rx != active_ant->rx)
 196                 flags |= CONFIG_UPDATE_ANTENNA;
 197         else if (conf->antenna_sel_rx &&
 198                  conf->antenna_sel_rx != active_ant->rx)
 199                 flags |= CONFIG_UPDATE_ANTENNA;
 200         else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 201                 flags |= CONFIG_UPDATE_ANTENNA;
 202
 203         if (!conf->antenna_sel_tx &&
 204             default_ant->tx != ANTENNA_SW_DIVERSITY &&
 205             default_ant->tx != active_ant->tx)
 206                 flags |= CONFIG_UPDATE_ANTENNA;
 207         else if (conf->antenna_sel_tx &&
 208                  conf->antenna_sel_tx != active_ant->tx)
 209                 flags |= CONFIG_UPDATE_ANTENNA;
 210         else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 211                 flags |= CONFIG_UPDATE_ANTENNA;
 212
 213         /*
 214          * The following configuration options are never
 215          * stored anywhere and will always be updated.
 216          */
 217         flags |= CONFIG_UPDATE_SLOT_TIME;
 218         flags |= CONFIG_UPDATE_BEACON_INT;
 219
 220         /*
 221          * We have determined what options should be updated,
 222          * now precalculate device configuration values depending
 223          * on what configuration options need to be updated.
 224          */
 225 config:
 226         memset(&libconf, 0, sizeof(libconf));
 227
 228         if (flags & CONFIG_UPDATE_PHYMODE) {
 229                 band = &rt2x00dev->bands[conf->channel->band];
 230                 rate = &band->bitrates[band->n_bitrates - 1];
 231
 232                 libconf.band = conf->channel->band;
 233                 libconf.basic_rates = rt2x00_get_rate(rate->hw_value)->ratemask;
 234         }
 235
 236         if (flags & CONFIG_UPDATE_CHANNEL) {
 237                 memcpy(&libconf.rf,
 238                        &rt2x00dev->spec.channels[conf->channel->hw_value],
 239                        sizeof(libconf.rf));
 240         }
 241
 242         if (flags & CONFIG_UPDATE_ANTENNA) {
 243                 if (conf->antenna_sel_rx)
 244                         libconf.ant.rx = conf->antenna_sel_rx;
 245                 else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
 246                         libconf.ant.rx = default_ant->rx;
 247                 else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 248                         libconf.ant.rx = ANTENNA_B;
 249
 250                 if (conf->antenna_sel_tx)
 251                         libconf.ant.tx = conf->antenna_sel_tx;
 252                 else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
 253                         libconf.ant.tx = default_ant->tx;
 254                 else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 255                         libconf.ant.tx = ANTENNA_B;
 256         }
 257
 258         if (flags & CONFIG_UPDATE_SLOT_TIME) {
 259                 short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;
 260
 261                 libconf.slot_time =
 262                     short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
 263                 libconf.sifs = SIFS;
 264                 libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
 265                 libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
 266                 libconf.eifs = EIFS;
 267         }
 268
 269         libconf.conf = conf;
 270
 271         /*
 272          * Start configuration.
 273          */
 274         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, flags);
 275
 276         /*
 277          * Some configuration changes affect the link quality
 278          * which means we need to reset the link tuner.
 279          */
 280         if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
 281                 rt2x00lib_reset_link_tuner(rt2x00dev);
 282
 283         if (flags & CONFIG_UPDATE_PHYMODE) {
 284                 rt2x00dev->curr_band = conf->channel->band;
 285                 rt2x00dev->rx_status.band = conf->channel->band;
 286         }
 287
 288         rt2x00dev->rx_status.freq = conf->channel->center_freq;
 289         rt2x00dev->tx_power = conf->power_level;
 290
 291         if (flags & CONFIG_UPDATE_ANTENNA) {
 292                 rt2x00dev->link.ant.active.rx = libconf.ant.rx;
 293                 rt2x00dev->link.ant.active.tx = libconf.ant.tx;
 294         }
 295 }