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 nl80211_iftype 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 NL80211_IFTYPE_ADHOC:
  44         case NL80211_IFTYPE_AP:
  45                 conf.sync = TSF_SYNC_BEACON;
  46                 break;
  47         case NL80211_IFTYPE_STATION:
  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.cts_protection = bss_conf->use_cts_prot;
  88
  89         erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
  90         erp.sifs = SIFS;
  91         erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
  92         erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
  93         erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
  94
  95         erp.ack_timeout = PLCP + erp.difs + GET_DURATION(ACK_SIZE, 10);
  96         erp.ack_consume_time = SIFS + PLCP + GET_DURATION(ACK_SIZE, 10);
  97
  98         if (bss_conf->use_short_preamble) {
  99                 erp.ack_timeout += SHORT_PREAMBLE;
 100                 erp.ack_consume_time += SHORT_PREAMBLE;
 101         } else {
 102                 erp.ack_timeout += PREAMBLE;
 103                 erp.ack_consume_time += PREAMBLE;
 104         }
 105
 106         erp.basic_rates = bss_conf->basic_rates;
 107
 108         rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);
 109 }
 110
 111 static inline
 112 enum antenna rt2x00lib_config_antenna_check(enum antenna current_ant,
 113                                             enum antenna default_ant)
 114 {
 115         if (current_ant != ANTENNA_SW_DIVERSITY)
 116                 return current_ant;
 117         return (default_ant != ANTENNA_SW_DIVERSITY) ? default_ant : ANTENNA_B;
 118 }
 119
 120 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 121                               struct antenna_setup *ant)
 122 {
 123         struct antenna_setup *def = &rt2x00dev->default_ant;
 124         struct antenna_setup *active = &rt2x00dev->link.ant.active;
 125
 126         /*
 127          * Failsafe: Make sure we are not sending the
 128          * ANTENNA_SW_DIVERSITY state to the driver.
 129          * If that happes fallback to hardware default,
 130          * or our own default.
 131          * The calls to rt2x00lib_config_antenna_check()
 132          * might have caused that we restore back to the already
 133          * active setting. If that has happened we can quit.
 134          */
 135         ant->rx = rt2x00lib_config_antenna_check(ant->rx, def->rx);
 136         ant->tx = rt2x00lib_config_antenna_check(ant->tx, def->tx);
 137
 138         if (ant->rx == active->rx && ant->tx == active->tx)
 139                 return;
 140
 141         /*
 142          * Antenna setup changes require the RX to be disabled,
 143          * else the changes will be ignored by the device.
 144          */
 145         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 146                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);
 147
 148         /*
 149          * Write new antenna setup to device and reset the link tuner.
 150          * The latter is required since we need to recalibrate the
 151          * noise-sensitivity ratio for the new setup.
 152          */
 153         rt2x00dev->ops->lib->config_ant(rt2x00dev, ant);
 154
 155         rt2x00lib_reset_link_tuner(rt2x00dev);
 156         rt2x00_reset_link_ant_rssi(&rt2x00dev->link);
 157
 158         memcpy(active, ant, sizeof(*ant));
 159
 160         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 161                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
 162 }
 163
 164 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 165                       struct ieee80211_conf *conf,
 166                       unsigned int ieee80211_flags)
 167 {
 168         struct rt2x00lib_conf libconf;
 169
 170         memset(&libconf, 0, sizeof(libconf));
 171
 172         libconf.conf = conf;
 173
 174         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
 175                 memcpy(&libconf.rf,
 176                        &rt2x00dev->spec.channels[conf->channel->hw_value],
 177                        sizeof(libconf.rf));
 178
 179                 memcpy(&libconf.channel,
 180                        &rt2x00dev->spec.channels_info[conf->channel->hw_value],
 181                        sizeof(libconf.channel));
 182         }
 183
 184         /*
 185          * Start configuration.
 186          */
 187         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
 188
 189         /*
 190          * Some configuration changes affect the link quality
 191          * which means we need to reset the link tuner.
 192          */
 193         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
 194                 rt2x00lib_reset_link_tuner(rt2x00dev);
 195
 196         rt2x00dev->curr_band = conf->channel->band;
 197         rt2x00dev->tx_power = conf->power_level;
 198         rt2x00dev->short_retry = conf->short_frame_max_tx_count;
 199         rt2x00dev->long_retry = conf->long_frame_max_tx_count;
 200
 201         rt2x00dev->rx_status.band = conf->channel->band;
 202         rt2x00dev->rx_status.freq = conf->channel->center_freq;
 203 }