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         int flags = 0;
 104         int short_slot_time;
 105
 106         /*
 107          * In some situations we want to force all configurations
 108          * to be reloaded (When resuming for instance).
 109          */
 110         if (force_config) {
 111                 flags = CONFIG_UPDATE_ALL;
 112                 goto config;
 113         }
 114
 115         /*
 116          * Check which configuration options have been
 117          * updated and should be send to the device.
 118          */
 119         if (rt2x00dev->rx_status.phymode != conf->phymode)
 120                 flags |= CONFIG_UPDATE_PHYMODE;
 121         if (rt2x00dev->rx_status.channel != conf->channel)
 122                 flags |= CONFIG_UPDATE_CHANNEL;
 123         if (rt2x00dev->tx_power != conf->power_level)
 124                 flags |= CONFIG_UPDATE_TXPOWER;
 125         if (rt2x00dev->rx_status.antenna == conf->antenna_sel_rx)
 126                 flags |= CONFIG_UPDATE_ANTENNA;
 127
 128         /*
 129          * The following configuration options are never
 130          * stored anywhere and will always be updated.
 131          */
 132         flags |= CONFIG_UPDATE_SLOT_TIME;
 133         flags |= CONFIG_UPDATE_BEACON_INT;
 134
 135         /*
 136          * We have determined what options should be updated,
 137          * now precalculate device configuration values depending
 138          * on what configuration options need to be updated.
 139          */
 140 config:
 141         memset(&libconf, 0, sizeof(libconf));
 142
 143         if (flags & CONFIG_UPDATE_PHYMODE) {
 144                 switch (conf->phymode) {
 145                 case MODE_IEEE80211A:
 146                         libconf.phymode = HWMODE_A;
 147                         break;
 148                 case MODE_IEEE80211B:
 149                         libconf.phymode = HWMODE_B;
 150                         break;
 151                 case MODE_IEEE80211G:
 152                         libconf.phymode = HWMODE_G;
 153                         break;
 154                 default:
 155                         ERROR(rt2x00dev,
 156                               "Attempt to configure unsupported mode (%d)"
 157                               "Defaulting to 802.11b", conf->phymode);
 158                         libconf.phymode = HWMODE_B;
 159                 }
 160
 161                 mode = &rt2x00dev->hwmodes[libconf.phymode];
 162                 rate = &mode->rates[mode->num_rates - 1];
 163
 164                 libconf.basic_rates =
 165                     DEVICE_GET_RATE_FIELD(rate->val, RATEMASK) & DEV_BASIC_RATEMASK;
 166         }
 167
 168         if (flags & CONFIG_UPDATE_CHANNEL) {
 169                 memcpy(&libconf.rf,
 170                        &rt2x00dev->spec.channels[conf->channel_val],
 171                        sizeof(libconf.rf));
 172         }
 173
 174         if (flags & CONFIG_UPDATE_SLOT_TIME) {
 175                 short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;
 176
 177                 libconf.slot_time =
 178                     short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
 179                 libconf.sifs = SIFS;
 180                 libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
 181                 libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
 182                 libconf.eifs = EIFS;
 183         }
 184
 185         libconf.conf = conf;
 186
 187         /*
 188          * Start configuration.
 189          */
 190         rt2x00dev->ops->lib->config(rt2x00dev, flags, &libconf);
 191
 192         /*
 193          * Some configuration changes affect the link quality
 194          * which means we need to reset the link tuner.
 195          */
 196         if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
 197                 rt2x00lib_reset_link_tuner(rt2x00dev);
 198
 199         rt2x00dev->curr_hwmode = libconf.phymode;
 200         rt2x00dev->rx_status.phymode = conf->phymode;
 201         rt2x00dev->rx_status.freq = conf->freq;
 202         rt2x00dev->rx_status.channel = conf->channel;
 203         rt2x00dev->tx_power = conf->power_level;
 204         rt2x00dev->rx_status.antenna = conf->antenna_sel_rx;
 205 }