drivers/net/wireless/rt2x00/rt2x00config.c - linux - Git at Google

 /*
 	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
 	<http://rt2x00.serialmonkey.com>

 	This program is free software; you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation; either version 2 of the License, or
 	(at your option) any later version.

 	This program is distributed in the hope that it will be useful,
 	but WITHOUT ANY WARRANTY; without even the implied warranty of
 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 	GNU General Public License for more details.

 	You should have received a copy of the GNU General Public License
 	along with this program; if not, write to the
 	Free Software Foundation, Inc.,
 	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */

 /*
 	Module: rt2x00lib
 	Abstract: rt2x00 generic configuration routines.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>

 #include "rt2x00.h"
 #include "rt2x00lib.h"

 void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
 			   struct rt2x00_intf *intf,
 			   enum ieee80211_if_types type,
 			   u8 *mac, u8 *bssid)
 {
 	struct rt2x00intf_conf conf;
 	unsigned int flags = 0;

 	conf.type = type;

 	switch (type) {
 	case IEEE80211_IF_TYPE_IBSS:
 	case IEEE80211_IF_TYPE_AP:
 		conf.sync = TSF_SYNC_BEACON;
 		break;
 	case IEEE80211_IF_TYPE_STA:
 		conf.sync = TSF_SYNC_INFRA;
 		break;
 	default:
 		conf.sync = TSF_SYNC_NONE;
 		break;
 	}

 	/*
 	 * Note that when NULL is passed as address we will send
 	 * 00:00:00:00:00 to the device to clear the address.
 	 * This will prevent the device being confused when it wants
 	 * to ACK frames or consideres itself associated.
 	 */
 	memset(&conf.mac, 0, sizeof(conf.mac));
 	if (mac)
 		memcpy(&conf.mac, mac, ETH_ALEN);

 	memset(&conf.bssid, 0, sizeof(conf.bssid));
 	if (bssid)
 		memcpy(&conf.bssid, bssid, ETH_ALEN);

 	flags |= CONFIG_UPDATE_TYPE;
 	if (mac || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
 		flags |= CONFIG_UPDATE_MAC;
 	if (bssid || (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
 		flags |= CONFIG_UPDATE_BSSID;

 	rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
 }

 void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
 			  struct rt2x00_intf *intf,
 			  struct ieee80211_bss_conf *bss_conf)
 {
 	struct rt2x00lib_erp erp;
 	int retval;

 	memset(&erp, 0, sizeof(erp));

 	erp.short_preamble = bss_conf->use_short_preamble;
 	erp.ack_timeout = PLCP + get_duration(ACK_SIZE, 10);
 	erp.ack_consume_time = SIFS + PLCP + get_duration(ACK_SIZE, 10);

 	if (rt2x00dev->hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME)
 		erp.ack_timeout += SHORT_DIFS;
 	else
 		erp.ack_timeout += DIFS;

 	if (bss_conf->use_short_preamble) {
 		erp.ack_timeout += SHORT_PREAMBLE;
 		erp.ack_consume_time += SHORT_PREAMBLE;
 	} else {
 		erp.ack_timeout += PREAMBLE;
 		erp.ack_consume_time += PREAMBLE;
 	}

 	retval = rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);

 	if (retval) {
 		spin_lock(&intf->lock);
 		intf->delayed_flags |= DELAYED_CONFIG_ERP;
 		queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
 		spin_unlock(&intf->lock);
 	}
 }

 void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
 			      enum antenna rx, enum antenna tx)
 {
 	struct rt2x00lib_conf libconf;

 	libconf.ant.rx = rx;
 	libconf.ant.tx = tx;

 	if (rx == rt2x00dev->link.ant.active.rx &&
 	    tx == rt2x00dev->link.ant.active.tx)
 		return;

 	/*
 	 * Antenna setup changes require the RX to be disabled,
 	 * else the changes will be ignored by the device.
 	 */
 	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 		rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);

 	/*
 	 * Write new antenna setup to device and reset the link tuner.
 	 * The latter is required since we need to recalibrate the
 	 * noise-sensitivity ratio for the new setup.
 	 */
 	rt2x00dev->ops->lib->config(rt2x00dev, &libconf, CONFIG_UPDATE_ANTENNA);
 	rt2x00lib_reset_link_tuner(rt2x00dev);

 	rt2x00dev->link.ant.active.rx = libconf.ant.rx;
 	rt2x00dev->link.ant.active.tx = libconf.ant.tx;

 	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 		rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
 }

 static u32 rt2x00lib_get_basic_rates(struct ieee80211_supported_band *band)
 {
 	const struct rt2x00_rate *rate;
 	unsigned int i;
 	u32 mask = 0;

 	for (i = 0; i < band->n_bitrates; i++) {
 		rate = rt2x00_get_rate(band->bitrates[i].hw_value);
 		if (rate->flags & DEV_RATE_BASIC)
 			mask |= rate->ratemask;
 	}

 	return mask;
 }

 void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
 		      struct ieee80211_conf *conf, const int force_config)
 {
 	struct rt2x00lib_conf libconf;
 	struct ieee80211_supported_band *band;
 	struct antenna_setup *default_ant = &rt2x00dev->default_ant;
 	struct antenna_setup *active_ant = &rt2x00dev->link.ant.active;
 	int flags = 0;
 	int short_slot_time;

 	/*
 	 * In some situations we want to force all configurations
 	 * to be reloaded (When resuming for instance).
 	 */
 	if (force_config) {
 		flags = CONFIG_UPDATE_ALL;
 		goto config;
 	}

 	/*
 	 * Check which configuration options have been
 	 * updated and should be send to the device.
 	 */
 	if (rt2x00dev->rx_status.band != conf->channel->band)
 		flags |= CONFIG_UPDATE_PHYMODE;
 	if (rt2x00dev->rx_status.freq != conf->channel->center_freq)
 		flags |= CONFIG_UPDATE_CHANNEL;
 	if (rt2x00dev->tx_power != conf->power_level)
 		flags |= CONFIG_UPDATE_TXPOWER;

 	/*
 	 * Determining changes in the antenna setups request several checks:
 	 * antenna_sel_{r,t}x = 0
 	 *    -> Does active_{r,t}x match default_{r,t}x
 	 *    -> Is default_{r,t}x SW_DIVERSITY
 	 * antenna_sel_{r,t}x = 1/2
 	 *    -> Does active_{r,t}x match antenna_sel_{r,t}x
 	 * The reason for not updating the antenna while SW diversity
 	 * should be used is simple: Software diversity means that
 	 * we should switch between the antenna's based on the
 	 * quality. This means that the current antenna is good enough
 	 * to work with untill the link tuner decides that an antenna
 	 * switch should be performed.
 	 */
 	if (!conf->antenna_sel_rx &&
 	    default_ant->rx != ANTENNA_SW_DIVERSITY &&
 	    default_ant->rx != active_ant->rx)
 		flags |= CONFIG_UPDATE_ANTENNA;
 	else if (conf->antenna_sel_rx &&
 		 conf->antenna_sel_rx != active_ant->rx)
 		flags |= CONFIG_UPDATE_ANTENNA;
 	else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 		flags |= CONFIG_UPDATE_ANTENNA;

 	if (!conf->antenna_sel_tx &&
 	    default_ant->tx != ANTENNA_SW_DIVERSITY &&
 	    default_ant->tx != active_ant->tx)
 		flags |= CONFIG_UPDATE_ANTENNA;
 	else if (conf->antenna_sel_tx &&
 		 conf->antenna_sel_tx != active_ant->tx)
 		flags |= CONFIG_UPDATE_ANTENNA;
 	else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 		flags |= CONFIG_UPDATE_ANTENNA;

 	/*
 	 * The following configuration options are never
 	 * stored anywhere and will always be updated.
 	 */
 	flags |= CONFIG_UPDATE_SLOT_TIME;
 	flags |= CONFIG_UPDATE_BEACON_INT;

 	/*
 	 * We have determined what options should be updated,
 	 * now precalculate device configuration values depending
 	 * on what configuration options need to be updated.
 	 */
 config:
 	memset(&libconf, 0, sizeof(libconf));

 	if (flags & CONFIG_UPDATE_PHYMODE) {
 		band = &rt2x00dev->bands[conf->channel->band];

 		libconf.band = conf->channel->band;
 		libconf.basic_rates = rt2x00lib_get_basic_rates(band);
 	}

 	if (flags & CONFIG_UPDATE_CHANNEL) {
 		memcpy(&libconf.rf,
 		       &rt2x00dev->spec.channels[conf->channel->hw_value],
 		       sizeof(libconf.rf));
 	}

 	if (flags & CONFIG_UPDATE_ANTENNA) {
 		if (conf->antenna_sel_rx)
 			libconf.ant.rx = conf->antenna_sel_rx;
 		else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
 			libconf.ant.rx = default_ant->rx;
 		else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
 			libconf.ant.rx = ANTENNA_B;

 		if (conf->antenna_sel_tx)
 			libconf.ant.tx = conf->antenna_sel_tx;
 		else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
 			libconf.ant.tx = default_ant->tx;
 		else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
 			libconf.ant.tx = ANTENNA_B;
 	}

 	if (flags & CONFIG_UPDATE_SLOT_TIME) {
 		short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;

 		libconf.slot_time =
 		    short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
 		libconf.sifs = SIFS;
 		libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
 		libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
 		libconf.eifs = EIFS;
 	}

 	libconf.conf = conf;

 	/*
 	 * Start configuration.
 	 */
 	rt2x00dev->ops->lib->config(rt2x00dev, &libconf, flags);

 	/*
 	 * Some configuration changes affect the link quality
 	 * which means we need to reset the link tuner.
 	 */
 	if (flags & (CONFIG_UPDATE_CHANNEL | CONFIG_UPDATE_ANTENNA))
 		rt2x00lib_reset_link_tuner(rt2x00dev);

 	if (flags & CONFIG_UPDATE_PHYMODE) {
 		rt2x00dev->curr_band = conf->channel->band;
 		rt2x00dev->rx_status.band = conf->channel->band;
 	}

 	rt2x00dev->rx_status.freq = conf->channel->center_freq;
 	rt2x00dev->tx_power = conf->power_level;

 	if (flags & CONFIG_UPDATE_ANTENNA) {
 		rt2x00dev->link.ant.active.rx = libconf.ant.rx;
 		rt2x00dev->link.ant.active.tx = libconf.ant.tx;
 	}
 }
	/*
	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the
	Free Software Foundation, Inc.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	/*
	Module: rt2x00lib
	Abstract: rt2x00 generic configuration routines.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>

	#include "rt2x00.h"
	#include "rt2x00lib.h"

	void rt2x00lib_config_intf(struct rt2x00_dev *rt2x00dev,
	struct rt2x00_intf *intf,
	enum ieee80211_if_types type,
	u8 mac, u8 bssid)
	{
	struct rt2x00intf_conf conf;
	unsigned int flags = 0;

	conf.type = type;

	switch (type) {
	case IEEE80211_IF_TYPE_IBSS:
	case IEEE80211_IF_TYPE_AP:
	conf.sync = TSF_SYNC_BEACON;
	break;
	case IEEE80211_IF_TYPE_STA:
	conf.sync = TSF_SYNC_INFRA;
	break;
	default:
	conf.sync = TSF_SYNC_NONE;
	break;
	}

	/*
	* Note that when NULL is passed as address we will send
	* 00:00:00:00:00 to the device to clear the address.
	* This will prevent the device being confused when it wants
	* to ACK frames or consideres itself associated.
	*/
	memset(&conf.mac, 0, sizeof(conf.mac));
	if (mac)
	memcpy(&conf.mac, mac, ETH_ALEN);

	memset(&conf.bssid, 0, sizeof(conf.bssid));
	if (bssid)
	memcpy(&conf.bssid, bssid, ETH_ALEN);

	flags \|= CONFIG_UPDATE_TYPE;
	if (mac \|\| (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
	flags \|= CONFIG_UPDATE_MAC;
	if (bssid \|\| (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count))
	flags \|= CONFIG_UPDATE_BSSID;

	rt2x00dev->ops->lib->config_intf(rt2x00dev, intf, &conf, flags);
	}

	void rt2x00lib_config_erp(struct rt2x00_dev *rt2x00dev,
	struct rt2x00_intf *intf,
	struct ieee80211_bss_conf *bss_conf)
	{
	struct rt2x00lib_erp erp;
	int retval;

	memset(&erp, 0, sizeof(erp));

	erp.short_preamble = bss_conf->use_short_preamble;
	erp.ack_timeout = PLCP + get_duration(ACK_SIZE, 10);
	erp.ack_consume_time = SIFS + PLCP + get_duration(ACK_SIZE, 10);

	if (rt2x00dev->hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME)
	erp.ack_timeout += SHORT_DIFS;
	else
	erp.ack_timeout += DIFS;

	if (bss_conf->use_short_preamble) {
	erp.ack_timeout += SHORT_PREAMBLE;
	erp.ack_consume_time += SHORT_PREAMBLE;
	} else {
	erp.ack_timeout += PREAMBLE;
	erp.ack_consume_time += PREAMBLE;
	}

	retval = rt2x00dev->ops->lib->config_erp(rt2x00dev, &erp);

	if (retval) {
	spin_lock(&intf->lock);
	intf->delayed_flags \|= DELAYED_CONFIG_ERP;
	queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->intf_work);
	spin_unlock(&intf->lock);
	}
	}

	void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
	enum antenna rx, enum antenna tx)
	{
	struct rt2x00lib_conf libconf;

	libconf.ant.rx = rx;
	libconf.ant.tx = tx;

	if (rx == rt2x00dev->link.ant.active.rx &&
	tx == rt2x00dev->link.ant.active.tx)
	return;

	/*
	* Antenna setup changes require the RX to be disabled,
	* else the changes will be ignored by the device.
	*/
	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);

	/*
	* Write new antenna setup to device and reset the link tuner.
	* The latter is required since we need to recalibrate the
	* noise-sensitivity ratio for the new setup.
	*/
	rt2x00dev->ops->lib->config(rt2x00dev, &libconf, CONFIG_UPDATE_ANTENNA);
	rt2x00lib_reset_link_tuner(rt2x00dev);

	rt2x00dev->link.ant.active.rx = libconf.ant.rx;
	rt2x00dev->link.ant.active.tx = libconf.ant.tx;

	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);
	}

	static u32 rt2x00lib_get_basic_rates(struct ieee80211_supported_band *band)
	{
	const struct rt2x00_rate *rate;
	unsigned int i;
	u32 mask = 0;

	for (i = 0; i < band->n_bitrates; i++) {
	rate = rt2x00_get_rate(band->bitrates[i].hw_value);
	if (rate->flags & DEV_RATE_BASIC)
	mask \|= rate->ratemask;
	}

	return mask;
	}

	void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
	struct ieee80211_conf *conf, const int force_config)
	{
	struct rt2x00lib_conf libconf;
	struct ieee80211_supported_band *band;
	struct antenna_setup *default_ant = &rt2x00dev->default_ant;
	struct antenna_setup *active_ant = &rt2x00dev->link.ant.active;
	int flags = 0;
	int short_slot_time;

	/*
	* In some situations we want to force all configurations
	* to be reloaded (When resuming for instance).
	*/
	if (force_config) {
	flags = CONFIG_UPDATE_ALL;
	goto config;
	}

	/*
	* Check which configuration options have been
	* updated and should be send to the device.
	*/
	if (rt2x00dev->rx_status.band != conf->channel->band)
	flags \|= CONFIG_UPDATE_PHYMODE;
	if (rt2x00dev->rx_status.freq != conf->channel->center_freq)
	flags \|= CONFIG_UPDATE_CHANNEL;
	if (rt2x00dev->tx_power != conf->power_level)
	flags \|= CONFIG_UPDATE_TXPOWER;

	/*
	* Determining changes in the antenna setups request several checks:
	* antenna_sel_{r,t}x = 0
	* -> Does active_{r,t}x match default_{r,t}x
	* -> Is default_{r,t}x SW_DIVERSITY
	* antenna_sel_{r,t}x = 1/2
	* -> Does active_{r,t}x match antenna_sel_{r,t}x
	* The reason for not updating the antenna while SW diversity
	* should be used is simple: Software diversity means that
	* we should switch between the antenna's based on the
	* quality. This means that the current antenna is good enough
	* to work with untill the link tuner decides that an antenna
	* switch should be performed.
	*/
	if (!conf->antenna_sel_rx &&
	default_ant->rx != ANTENNA_SW_DIVERSITY &&
	default_ant->rx != active_ant->rx)
	flags \|= CONFIG_UPDATE_ANTENNA;
	else if (conf->antenna_sel_rx &&
	conf->antenna_sel_rx != active_ant->rx)
	flags \|= CONFIG_UPDATE_ANTENNA;
	else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
	flags \|= CONFIG_UPDATE_ANTENNA;

	if (!conf->antenna_sel_tx &&
	default_ant->tx != ANTENNA_SW_DIVERSITY &&
	default_ant->tx != active_ant->tx)
	flags \|= CONFIG_UPDATE_ANTENNA;
	else if (conf->antenna_sel_tx &&
	conf->antenna_sel_tx != active_ant->tx)
	flags \|= CONFIG_UPDATE_ANTENNA;
	else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
	flags \|= CONFIG_UPDATE_ANTENNA;

	/*
	* The following configuration options are never
	* stored anywhere and will always be updated.
	*/
	flags \|= CONFIG_UPDATE_SLOT_TIME;
	flags \|= CONFIG_UPDATE_BEACON_INT;

	/*
	* We have determined what options should be updated,
	* now precalculate device configuration values depending
	* on what configuration options need to be updated.
	*/
	config:
	memset(&libconf, 0, sizeof(libconf));

	if (flags & CONFIG_UPDATE_PHYMODE) {
	band = &rt2x00dev->bands[conf->channel->band];

	libconf.band = conf->channel->band;
	libconf.basic_rates = rt2x00lib_get_basic_rates(band);
	}

	if (flags & CONFIG_UPDATE_CHANNEL) {
	memcpy(&libconf.rf,
	&rt2x00dev->spec.channels[conf->channel->hw_value],
	sizeof(libconf.rf));
	}

	if (flags & CONFIG_UPDATE_ANTENNA) {
	if (conf->antenna_sel_rx)
	libconf.ant.rx = conf->antenna_sel_rx;
	else if (default_ant->rx != ANTENNA_SW_DIVERSITY)
	libconf.ant.rx = default_ant->rx;
	else if (active_ant->rx == ANTENNA_SW_DIVERSITY)
	libconf.ant.rx = ANTENNA_B;

	if (conf->antenna_sel_tx)
	libconf.ant.tx = conf->antenna_sel_tx;
	else if (default_ant->tx != ANTENNA_SW_DIVERSITY)
	libconf.ant.tx = default_ant->tx;
	else if (active_ant->tx == ANTENNA_SW_DIVERSITY)
	libconf.ant.tx = ANTENNA_B;
	}

	if (flags & CONFIG_UPDATE_SLOT_TIME) {
	short_slot_time = conf->flags & IEEE80211_CONF_SHORT_SLOT_TIME;

	libconf.slot_time =
	short_slot_time ? SHORT_SLOT_TIME : SLOT_TIME;
	libconf.sifs = SIFS;
	libconf.pifs = short_slot_time ? SHORT_PIFS : PIFS;
	libconf.difs = short_slot_time ? SHORT_DIFS : DIFS;
	libconf.eifs = EIFS;
	}

	libconf.conf = conf;

	/*
	* Start configuration.
	*/
	rt2x00dev->ops->lib->config(rt2x00dev, &libconf, flags);

	/*
	* Some configuration changes affect the link quality
	* which means we need to reset the link tuner.
	*/
	if (flags & (CONFIG_UPDATE_CHANNEL \| CONFIG_UPDATE_ANTENNA))
	rt2x00lib_reset_link_tuner(rt2x00dev);

	if (flags & CONFIG_UPDATE_PHYMODE) {
	rt2x00dev->curr_band = conf->channel->band;
	rt2x00dev->rx_status.band = conf->channel->band;
	}

	rt2x00dev->rx_status.freq = conf->channel->center_freq;
	rt2x00dev->tx_power = conf->power_level;

	if (flags & CONFIG_UPDATE_ANTENNA) {
	rt2x00dev->link.ant.active.rx = libconf.ant.rx;
	rt2x00dev->link.ant.active.tx = libconf.ant.tx;
	}
	}