302 lines
8.6 KiB
C
302 lines
8.6 KiB
C
/*
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Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
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<http://rt2x00.serialmonkey.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: rt2x00lib
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Abstract: rt2x00 generic configuration routines.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "rt2x00.h"
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#include "rt2x00lib.h"
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void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
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struct rt2x00_intf *intf,
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enum ieee80211_if_types type,
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u8 *mac, u8 *bssid)
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{
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struct rt2x00intf_conf conf;
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unsigned int flags = 0;
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conf.type = type;
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switch (type) {
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case IEEE80211_IF_TYPE_IBSS:
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case IEEE80211_IF_TYPE_AP:
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conf.sync = TSF_SYNC_BEACON;
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break;
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case IEEE80211_IF_TYPE_STA:
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conf.sync = TSF_SYNC_INFRA;
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break;
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default:
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conf.sync = TSF_SYNC_NONE;
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break;
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}
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/*
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* Note that when NULL is passed as address we will send
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* 00:00:00:00:00 to the device to clear the address.
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* This will prevent the device being confused when it wants
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* to ACK frames or consideres itself associated.
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*/
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memset(&conf.mac, 0, sizeof(conf.mac));
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if (mac)
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memcpy(&conf.mac, mac, ETH_ALEN);
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memset(&conf.bssid, 0, sizeof(conf.bssid));
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if (bssid)
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memcpy(&conf.bssid, bssid, ETH_ALEN);
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flags |= CONFIG_UPDATE_TYPE;
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if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
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flags |= CONFIG_UPDATE_MAC;
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if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
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flags |= CONFIG_UPDATE_BSSID;
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rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
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}
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void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
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struct rt2x00_intf *intf,
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struct ieee80211_bss_conf *bss_conf)
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{
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struct rt2x00lib_erp erp;
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memset(&erp, 0, sizeof(erp));
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erp.short_preamble = bss_conf->use_short_preamble;
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erp.ack_timeout = PLCP + get_duration(ACK_SIZE, 10);
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erp.ack_consume_time = SIFS + PLCP + get_duration(ACK_SIZE, 10);
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if (rt2x00dev->hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME)
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erp.ack_timeout += SHORT_DIFS;
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else
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erp.ack_timeout += DIFS;
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if (bss_conf->use_short_preamble) {
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erp.ack_timeout += SHORT_PREAMBLE;
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erp.ack_consume_time += SHORT_PREAMBLE;
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} else {
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erp.ack_timeout += PREAMBLE;
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erp.ack_consume_time += PREAMBLE;
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}
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rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);
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}
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void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
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enum antenna rx, enum antenna tx)
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{
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struct rt2x00lib_conf libconf;
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libconf.ant.rx = rx;
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libconf.ant.tx = tx;
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if (rx == rt2x00dev->link.ant.active.rx &&
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tx == rt2x00dev->link.ant.active.tx)
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return;
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/*
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* Antenna setup changes require the RX to be disabled,
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* else the changes will be ignored by the device.
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*/
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if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
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rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);
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/*
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* Write new antenna setup to device and reset the link tuner.
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* The latter is required since we need to recalibrate the
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* noise-sensitivity ratio for the new setup.
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*/
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rt2x00dev->ops->lib->config(rt2x00dev, &libconf, CONFIG_UPDATE_ANTENNA);
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rt2x00lib_reset_link_tuner(rt2x00dev);
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rt2x00_reset_link_ant_rssi(&rt2x00dev->link);
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rt2x00dev->link.ant.active.rx = libconf.ant.rx;
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rt2x00dev->link.ant.active.tx = libconf.ant.tx;
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if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
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rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
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}
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static u32 rt2x00lib_get_basic_rates(struct ieee80211_supported_band *band)
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{
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const struct rt2x00_rate *rate;
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unsigned int i;
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u32 mask = 0;
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for (i = 0; i < band->n_bitrates; i++) {
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rate = rt2x00_get_rate(band->bitrates[i].hw_value);
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if (rate->flags & DEV_RATE_BASIC)
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mask |= rate->ratemask;
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}
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return mask;
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}
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void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
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struct ieee80211_conf *conf, const int force_config)
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{
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struct rt2x00lib_conf libconf;
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struct ieee80211_supported_band *band;
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struct antenna_setup *default_ant = &rt2x00dev->default_ant;
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struct antenna_setup *active_ant = &rt2x00dev->link.ant.active;
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int flags = 0;
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int short_slot_time;
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/*
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* In some situations we want to force all configurations
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* to be reloaded (When resuming for instance).
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*/
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if (force_config) {
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flags = CONFIG_UPDATE_ALL;
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goto config;
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}
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/*
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* Check which configuration options have been
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* updated and should be send to the device.
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*/
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if (rt2x00dev->rx_status.band != conf->channel->band)
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flags |= CONFIG_UPDATE_PHYMODE;
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if (rt2x00dev->rx_status.freq != conf->channel->center_freq)
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flags |= CONFIG_UPDATE_CHANNEL;
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if (rt2x00dev->tx_power != conf->power_level)
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flags |= CONFIG_UPDATE_TXPOWER;
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/*
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* Determining changes in the antenna setups request several checks:
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* antenna_sel_{r,t}x = 0
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* -> Does active_{r,t}x match default_{r,t}x
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* -> Is default_{r,t}x SW_DIVERSITY
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* antenna_sel_{r,t}x = 1/2
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* -> Does active_{r,t}x match antenna_sel_{r,t}x
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* The reason for not updating the antenna while SW diversity
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* should be used is simple: Software diversity means that
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* we should switch between the antenna's based on the
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* quality. This means that the current antenna is good enough
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* to work with untill the link tuner decides that an antenna
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* switch should be performed.
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*/
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if (!conf->antenna_sel_rx &&
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default_ant->rx != ANTENNA_SW_DIVERSITY &&
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default_ant->rx != active_ant->rx)
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flags |= CONFIG_UPDATE_ANTENNA;
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else if (conf->antenna_sel_rx &&
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conf->antenna_sel_rx != active_ant->rx)
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flags |= CONFIG_UPDATE_ANTENNA;
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else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
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flags |= CONFIG_UPDATE_ANTENNA;
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if (!conf->antenna_sel_tx &&
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default_ant->tx != ANTENNA_SW_DIVERSITY &&
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default_ant->tx != active_ant->tx)
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flags |= CONFIG_UPDATE_ANTENNA;
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else if (conf->antenna_sel_tx &&
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conf->antenna_sel_tx != active_ant->tx)
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flags |= CONFIG_UPDATE_ANTENNA;
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else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
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flags |= CONFIG_UPDATE_ANTENNA;
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/*
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* The following configuration options are never
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* stored anywhere and will always be updated.
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*/
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flags |= CONFIG_UPDATE_SLOT_TIME;
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flags |= CONFIG_UPDATE_BEACON_INT;
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/*
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* We have determined what options should be updated,
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* now precalculate device configuration values depending
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* on what configuration options need to be updated.
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*/
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config:
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memset(&libconf, 0, sizeof(libconf));
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if (flags & CONFIG_UPDATE_PHYMODE) {
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band = &rt2x00dev->bands[conf->channel->band];
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libconf.band = conf->channel->band;
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libconf.basic_rates = rt2x00lib_get_basic_rates(band);
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}
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if (flags & CONFIG_UPDATE_CHANNEL) {
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memcpy(&libconf.rf,
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&rt2x00dev->spec.channels[conf->channel->hw_value],
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sizeof(libconf.rf));
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}
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if (flags & CONFIG_UPDATE_ANTENNA) {
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if (conf->antenna_sel_rx)
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libconf.ant.rx = conf->antenna_sel_rx;
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else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
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libconf.ant.rx = default_ant->rx;
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else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
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libconf.ant.rx = ANTENNA_B;
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if (conf->antenna_sel_tx)
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libconf.ant.tx = conf->antenna_sel_tx;
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else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
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libconf.ant.tx = default_ant->tx;
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else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
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libconf.ant.tx = ANTENNA_B;
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}
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if (flags & CONFIG_UPDATE_SLOT_TIME) {
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short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;
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libconf.slot_time =
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short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
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libconf.sifs = SIFS;
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libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
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libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
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libconf.eifs = EIFS;
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}
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libconf.conf = conf;
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/*
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* Start configuration.
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*/
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rt2x00dev->ops->lib->config(rt2x00dev, &libconf, flags);
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/*
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* Some configuration changes affect the link quality
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* which means we need to reset the link tuner.
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*/
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if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
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rt2x00lib_reset_link_tuner(rt2x00dev);
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if (flags & CONFIG_UPDATE_PHYMODE) {
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rt2x00dev->curr_band = conf->channel->band;
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rt2x00dev->rx_status.band = conf->channel->band;
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}
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rt2x00dev->rx_status.freq = conf->channel->center_freq;
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rt2x00dev->tx_power = conf->power_level;
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if (flags & CONFIG_UPDATE_ANTENNA) {
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rt2x00dev->link.ant.active.rx = libconf.ant.rx;
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rt2x00dev->link.ant.active.tx = libconf.ant.tx;
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}
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}
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