drivers/net/wireless/rt2x00/rt2x00config.c

   1 /*
   2         Copyright (C) 2004 - 2009 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                            const u8 *mac, const 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         case NL80211_IFTYPE_MESH_POINT:
  46         case NL80211_IFTYPE_WDS:
  47                 conf.sync = TSF_SYNC_BEACON;
  48                 break;
  49         case NL80211_IFTYPE_STATION:
  50                 conf.sync = TSF_SYNC_INFRA;
  51                 break;
  52         default:
  53                 conf.sync = TSF_SYNC_NONE;
  54                 break;
  55         }
  56
  57         /*
  58          * Note that when NULL is passed as address we will send
  59          * 00:00:00:00:00 to the device to clear the address.
  60          * This will prevent the device being confused when it wants
  61          * to ACK frames or consideres itself associated.
  62          */
  63         memset(&conf.mac, 0, sizeof(conf.mac));
  64         if (mac)
  65                 memcpy(&conf.mac, mac, ETH_ALEN);
  66
  67         memset(&conf.bssid, 0, sizeof(conf.bssid));
  68         if (bssid)
  69                 memcpy(&conf.bssid, bssid, ETH_ALEN);
  70
  71         flags |= CONFIG_UPDATE_TYPE;
  72         if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  73                 flags |= CONFIG_UPDATE_MAC;
  74         if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
  75                 flags |= CONFIG_UPDATE_BSSID;
  76
  77         rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
  78 }
  79
  80 void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
  81                           struct rt2x00_intf *intf,
  82                           struct ieee80211_bss_conf *bss_conf)
  83 {
  84         struct rt2x00lib_erp erp;
  85
  86         memset(&erp, 0, sizeof(erp));
  87
  88         erp.short_preamble = bss_conf->use_short_preamble;
  89         erp.cts_protection = bss_conf->use_cts_prot;
  90
  91         erp.slot_time = bss_conf->use_short_slot ? SHORT_SLOT_TIME : SLOT_TIME;
  92         erp.sifs = SIFS;
  93         erp.pifs = bss_conf->use_short_slot ? SHORT_PIFS : PIFS;
  94         erp.difs = bss_conf->use_short_slot ? SHORT_DIFS : DIFS;
  95         erp.eifs = bss_conf->use_short_slot ? SHORT_EIFS : EIFS;
  96
  97         erp.ack_timeout = PLCP + erp.difs + GET_DURATION(ACK_SIZE, 10);
  98         erp.ack_consume_time = SIFS + PLCP + GET_DURATION(ACK_SIZE, 10);
  99
 100         if (bss_conf->use_short_preamble) {
 101                 erp.ack_timeout += SHORT_PREAMBLE;
 102                 erp.ack_consume_time += SHORT_PREAMBLE;
 103         } else {
 104                 erp.ack_timeout += PREAMBLE;
 105                 erp.ack_consume_time += PREAMBLE;
 106         }
 107
 108         erp.basic_rates = bss_conf->basic_rates;
 109
 110         rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);
 111 }
 112
 113 static inline
 114 enum antenna rt2x00lib_config_antenna_check(enum antenna current_ant,
 115                                             enum antenna default_ant)
 116 {
 117         if (current_ant != ANTENNA_SW_DIVERSITY)
 118                 return current_ant;
 119         return (default_ant != ANTENNA_SW_DIVERSITY) ? default_ant : ANTENNA_B;
 120 }
 121
 122 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 123                               struct antenna_setup *ant)
 124 {
 125         struct antenna_setup *def = &rt2x00dev->default_ant;
 126         struct antenna_setup *active = &rt2x00dev->link.ant.active;
 127
 128         /*
 129          * Failsafe: Make sure we are not sending the
 130          * ANTENNA_SW_DIVERSITY state to the driver.
 131          * If that happes fallback to hardware default,
 132          * or our own default.
 133          * The calls to rt2x00lib_config_antenna_check()
 134          * might have caused that we restore back to the already
 135          * active setting. If that has happened we can quit.
 136          */
 137         ant->rx = rt2x00lib_config_antenna_check(ant->rx, def->rx);
 138         ant->tx = rt2x00lib_config_antenna_check(ant->tx, def->tx);
 139
 140         if (ant->rx == active->rx && ant->tx == active->tx)
 141                 return;
 142
 143         /*
 144          * Antenna setup changes require the RX to be disabled,
 145          * else the changes will be ignored by the device.
 146          */
 147         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 148                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);
 149
 150         /*
 151          * Write new antenna setup to device and reset the link tuner.
 152          * The latter is required since we need to recalibrate the
 153          * noise-sensitivity ratio for the new setup.
 154          */
 155         rt2x00dev->ops->lib->config_ant(rt2x00dev, ant);
 156
 157         rt2x00link_reset_tuner(rt2x00dev, true);
 158
 159         memcpy(active, ant, sizeof(*ant));
 160
 161         if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 162                 rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
 163 }
 164
 165 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 166                       struct ieee80211_conf *conf,
 167                       unsigned int ieee80211_flags)
 168 {
 169         struct rt2x00lib_conf libconf;
 170
 171         memset(&libconf, 0, sizeof(libconf));
 172
 173         libconf.conf = conf;
 174
 175         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL) {
 176                 memcpy(&libconf.rf,
 177                        &rt2x00dev->spec.channels[conf->channel->hw_value],
 178                        sizeof(libconf.rf));
 179
 180                 memcpy(&libconf.channel,
 181                        &rt2x00dev->spec.channels_info[conf->channel->hw_value],
 182                        sizeof(libconf.channel));
 183         }
 184
 185         /*
 186          * Start configuration.
 187          */
 188         rt2x00dev->ops->lib->config(rt2x00dev, &libconf, ieee80211_flags);
 189
 190         /*
 191          * Some configuration changes affect the link quality
 192          * which means we need to reset the link tuner.
 193          */
 194         if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
 195                 rt2x00link_reset_tuner(rt2x00dev, false);
 196
 197         rt2x00dev->curr_band = conf->channel->band;
 198         rt2x00dev->tx_power = conf->power_level;
 199         rt2x00dev->short_retry = conf->short_frame_max_tx_count;
 200         rt2x00dev->long_retry = conf->long_frame_max_tx_count;
 201
 202         rt2x00dev->rx_status.band = conf->channel->band;
 203         rt2x00dev->rx_status.freq = conf->channel->center_freq;
 204 }