drivers/net/wireless/rt2x00/rt2x00config.c

   1 /*
   2         Copyright (C) 2004 - 2007 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 /*
  27  * Set enviroment defines for rt2x00.h
  28  */
  29 #define DRV_NAME "rt2x00lib"
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33
  34 #include "rt2x00.h"
  35 #include "rt2x00lib.h"
  36
  37
  38 /*
  39  * The MAC and BSSID addressess are simple array of bytes,
  40  * these arrays are little endian, so when sending the addressess
  41  * to the drivers, copy the it into a endian-signed variable.
  42  *
  43  * Note that all devices (except rt2500usb) have 32 bits
  44  * register word sizes. This means that whatever variable we
  45  * pass _must_ be a multiple of 32 bits. Otherwise the device
  46  * might not accept what we are sending to it.
  47  * This will also make it easier for the driver to write
  48  * the data to the device.
  49  *
  50  * Also note that when NULL is passed as address the
  51  * we will send 00:00:00:00:00 to the device to clear the address.
  52  * This will prevent the device being confused when it wants
  53  * to ACK frames or consideres itself associated.
  54  */
  55 void rt2x00lib_config_mac_addr(struct rt2x00_dev *rt2x00dev, u8 *mac)
  56 {
  57         __le32 reg[2];
  58
  59         memset(&reg, 0, sizeof(reg));
  60         if (mac)
  61                 memcpy(&reg, mac, ETH_ALEN);
  62
  63         rt2x00dev->ops->lib->config_mac_addr(rt2x00dev, &reg[0]);
  64 }
  65
  66 void rt2x00lib_config_bssid(struct rt2x00_dev *rt2x00dev, u8 *bssid)
  67 {
  68         __le32 reg[2];
  69
  70         memset(&reg, 0, sizeof(reg));
  71         if (bssid)
  72                 memcpy(&reg, bssid, ETH_ALEN);
  73
  74         rt2x00dev->ops->lib->config_bssid(rt2x00dev, &reg[0]);
  75 }
  76
  77 void rt2x00lib_config_type(struct rt2x00_dev *rt2x00dev, const int type)
  78 {
  79         int tsf_sync;
  80
  81         switch (type) {
  82         case IEEE80211_IF_TYPE_IBSS:
  83         case IEEE80211_IF_TYPE_AP:
  84                 tsf_sync = TSF_SYNC_BEACON;
  85                 break;
  86         case IEEE80211_IF_TYPE_STA:
  87                 tsf_sync = TSF_SYNC_INFRA;
  88                 break;
  89         default:
  90                 tsf_sync = TSF_SYNC_NONE;
  91                 break;
  92         }
  93
  94         rt2x00dev->ops->lib->config_type(rt2x00dev, type, tsf_sync);
  95 }
  96
  97 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
  98                       struct ieee80211_conf *conf, const int force_config)
  99 {
 100         struct rt2x00lib_conf libconf;
 101         struct ieee80211_hw_mode *mode;
 102         struct ieee80211_rate *rate;
 103         struct antenna_setup *default_ant = &rt2x00dev->default_ant;
 104         struct antenna_setup *active_ant = &rt2x00dev->link.active_ant;
 105         int flags = 0;
 106         int short_slot_time;
 107
 108         /*
 109          * In some situations we want to force all configurations
 110          * to be reloaded (When resuming for instance).
 111          */
 112         if (force_config) {
 113                 flags = CONFIG_UPDATE_ALL;
 114                 goto config;
 115         }
 116
 117         /*
 118          * Check which configuration options have been
 119          * updated and should be send to the device.
 120          */
 121         if (rt2x00dev->rx_status.phymode != conf->phymode)
 122                 flags |= CONFIG_UPDATE_PHYMODE;
 123         if (rt2x00dev->rx_status.channel != conf->channel)
 124                 flags |= CONFIG_UPDATE_CHANNEL;
 125         if (rt2x00dev->tx_power != conf->power_level)
 126                 flags |= CONFIG_UPDATE_TXPOWER;
 127
 128         /*
 129          * Determining changes in the antenna setups request several checks:
 130          * antenna_sel_{r,t}x = 0
 131          *    -> Does active_{r,t}x match default_{r,t}x
 132          *    -> Is default_{r,t}x SW_DIVERSITY
 133          * antenna_sel_{r,t}x = 1/2
 134          *    -> Does active_{r,t}x match antenna_sel_{r,t}x
 135          * The reason for not updating the antenna while SW diversity
 136          * should be used is simple: Software diversity means that
 137          * we should switch between the antenna's based on the
 138          * quality. This means that the current antenna is good enough
 139          * to work with untill the link tuner decides that an antenna
 140          * switch should be performed.
 141          */
 142         if (!conf->antenna_sel_rx &&
 143             default_ant->rx != ANTENNA_SW_DIVERSITY &&
 144             default_ant->rx != active_ant->rx)
 145                 flags |= CONFIG_UPDATE_ANTENNA;
 146         else if (conf->antenna_sel_rx &&
 147                  conf->antenna_sel_rx != active_ant->rx)
 148                 flags |= CONFIG_UPDATE_ANTENNA;
 149
 150         if (!conf->antenna_sel_tx &&
 151             default_ant->tx != ANTENNA_SW_DIVERSITY &&
 152             default_ant->tx != active_ant->tx)
 153                 flags |= CONFIG_UPDATE_ANTENNA;
 154         else if (conf->antenna_sel_tx &&
 155                  conf->antenna_sel_tx != active_ant->tx)
 156                 flags |= CONFIG_UPDATE_ANTENNA;
 157
 158         /*
 159          * The following configuration options are never
 160          * stored anywhere and will always be updated.
 161          */
 162         flags |= CONFIG_UPDATE_SLOT_TIME;
 163         flags |= CONFIG_UPDATE_BEACON_INT;
 164
 165         /*
 166          * We have determined what options should be updated,
 167          * now precalculate device configuration values depending
 168          * on what configuration options need to be updated.
 169          */
 170 config:
 171         memset(&libconf, 0, sizeof(libconf));
 172
 173         if (flags & CONFIG_UPDATE_PHYMODE) {
 174                 switch (conf->phymode) {
 175                 case MODE_IEEE80211A:
 176                         libconf.phymode = HWMODE_A;
 177                         break;
 178                 case MODE_IEEE80211B:
 179                         libconf.phymode = HWMODE_B;
 180                         break;
 181                 case MODE_IEEE80211G:
 182                         libconf.phymode = HWMODE_G;
 183                         break;
 184                 default:
 185                         ERROR(rt2x00dev,
 186                               "Attempt to configure unsupported mode (%d)"
 187                               "Defaulting to 802.11b", conf->phymode);
 188                         libconf.phymode = HWMODE_B;
 189                 }
 190
 191                 mode = &rt2x00dev->hwmodes[libconf.phymode];
 192                 rate = &mode->rates[mode->num_rates - 1];
 193
 194                 libconf.basic_rates =
 195                     DEVICE_GET_RATE_FIELD(rate->val, RATEMASK) & DEV_BASIC_RATEMASK;
 196         }
 197
 198         if (flags & CONFIG_UPDATE_CHANNEL) {
 199                 memcpy(&libconf.rf,
 200                        &rt2x00dev->spec.channels[conf->channel_val],
 201                        sizeof(libconf.rf));
 202         }
 203
 204         if (flags & CONFIG_UPDATE_ANTENNA) {
 205                 if (conf->antenna_sel_rx)
 206                         libconf.ant.rx = conf->antenna_sel_rx;
 207                 else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
 208                         libconf.ant.rx = default_ant->rx;
 209                 else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 210                         libconf.ant.rx = ANTENNA_B;
 211
 212                 if (conf->antenna_sel_tx)
 213                         libconf.ant.tx = conf->antenna_sel_tx;
 214                 else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
 215                         libconf.ant.tx = default_ant->tx;
 216                 else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 217                         libconf.ant.tx = ANTENNA_B;
 218         }
 219
 220         if (flags & CONFIG_UPDATE_SLOT_TIME) {
 221                 short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;
 222
 223                 libconf.slot_time =
 224                     short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
 225                 libconf.sifs = SIFS;
 226                 libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
 227                 libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
 228                 libconf.eifs = EIFS;
 229         }
 230
 231         libconf.conf = conf;
 232
 233         /*
 234          * Start configuration.
 235          */
 236         rt2x00dev->ops->lib->config(rt2x00dev, flags, &libconf);
 237
 238         /*
 239          * Some configuration changes affect the link quality
 240          * which means we need to reset the link tuner.
 241          */
 242         if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
 243                 rt2x00lib_reset_link_tuner(rt2x00dev);
 244
 245         rt2x00dev->curr_hwmode = libconf.phymode;
 246         rt2x00dev->rx_status.phymode = conf->phymode;
 247         rt2x00dev->rx_status.freq = conf->freq;
 248         rt2x00dev->rx_status.channel = conf->channel;
 249         rt2x00dev->tx_power = conf->power_level;
 250         rt2x00dev->link.active_ant.rx = libconf.ant.rx;
 251         rt2x00dev->link.active_ant.tx = libconf.ant.tx;
 252 }