path: root/drivers/net/wireless/rt2x00/rt2x00.h

/*
	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: rt2x00
	Abstract: rt2x00 global information.
 */

#ifndef RT2X00_H
#define RT2X00_H

#include <linux/bitops.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <linux/firmware.h>
#include <linux/mutex.h>
#include <linux/etherdevice.h>

#include <net/mac80211.h>

#include "rt2x00debug.h"
#include "rt2x00reg.h"
#include "rt2x00queue.h"

/*
 * Module information.
 */
#define DRV_VERSION	"2.0.14"
#define DRV_PROJECT	"http://rt2x00.serialmonkey.com"

/*
 * Debug definitions.
 * Debug output has to be enabled during compile time.
 */
#define DEBUG_PRINTK_MSG(__dev, __kernlvl, __lvl, __msg, __args...)	\
	printk(__kernlvl "%s -> %s: %s - " __msg,			\
	       wiphy_name((__dev)->hw->wiphy), __FUNCTION__, __lvl, ##__args)

#define DEBUG_PRINTK_PROBE(__kernlvl, __lvl, __msg, __args...)	\
	printk(__kernlvl "%s -> %s: %s - " __msg,		\
	       KBUILD_MODNAME, __FUNCTION__, __lvl, ##__args)

#ifdef CONFIG_RT2X00_DEBUG
#define DEBUG_PRINTK(__dev, __kernlvl, __lvl, __msg, __args...)	\
	DEBUG_PRINTK_MSG(__dev, __kernlvl, __lvl, __msg, ##__args);
#else
#define DEBUG_PRINTK(__dev, __kernlvl, __lvl, __msg, __args...)	\
	do { } while (0)
#endif /* CONFIG_RT2X00_DEBUG */

/*
 * Various debug levels.
 * The debug levels PANIC and ERROR both indicate serious problems,
 * for this reason they should never be ignored.
 * The special ERROR_PROBE message is for messages that are generated
 * when the rt2x00_dev is not yet initialized.
 */
#define PANIC(__dev, __msg, __args...) \
	DEBUG_PRINTK_MSG(__dev, KERN_CRIT, "Panic", __msg, ##__args)
#define ERROR(__dev, __msg, __args...)	\
	DEBUG_PRINTK_MSG(__dev, KERN_ERR, "Error", __msg, ##__args)
#define ERROR_PROBE(__msg, __args...) \
	DEBUG_PRINTK_PROBE(KERN_ERR, "Error", __msg, ##__args)
#define WARNING(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_WARNING, "Warning", __msg, ##__args)
#define NOTICE(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_NOTICE, "Notice", __msg, ##__args)
#define INFO(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_INFO, "Info", __msg, ##__args)
#define DEBUG(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_DEBUG, "Debug", __msg, ##__args)
#define EEPROM(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_DEBUG, "EEPROM recovery", __msg, ##__args)

/*
 * Standard timing and size defines.
 * These values should follow the ieee80211 specifications.
 */
#define ACK_SIZE		14
#define IEEE80211_HEADER	24
#define PLCP			48
#define BEACON			100
#define PREAMBLE		144
#define SHORT_PREAMBLE		72
#define SLOT_TIME		20
#define SHORT_SLOT_TIME		9
#define SIFS			10
#define PIFS			( SIFS + SLOT_TIME )
#define SHORT_PIFS		( SIFS + SHORT_SLOT_TIME )
#define DIFS			( PIFS + SLOT_TIME )
#define SHORT_DIFS		( SHORT_PIFS + SHORT_SLOT_TIME )
#define EIFS			( SIFS + (8 * (IEEE80211_HEADER + ACK_SIZE)) )

/*
 * IEEE802.11 header defines
 */
static inline int is_rts_frame(u16 fc)
{
	return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
		((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_RTS));
}

static inline int is_cts_frame(u16 fc)
{
	return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) &&
		((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_CTS));
}

static inline int is_probe_resp(u16 fc)
{
	return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
		((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP));
}

static inline int is_beacon(u16 fc)
{
	return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
		((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON));
}

/*
 * Chipset identification
 * The chipset on the device is composed of a RT and RF chip.
 * The chipset combination is important for determining device capabilities.
 */
struct rt2x00_chip {
	u16 rt;
#define RT2460		0x0101
#define RT2560		0x0201
#define RT2570		0x1201
#define RT2561s		0x0301	/* Turbo */
#define RT2561		0x0302
#define RT2661		0x0401
#define RT2571		0x1300

	u16 rf;
	u32 rev;
};

/*
 * RF register values that belong to a particular channel.
 */
struct rf_channel {
	int channel;
	u32 rf1;
	u32 rf2;
	u32 rf3;
	u32 rf4;
};

/*
 * Antenna setup values.
 */
struct antenna_setup {
	enum antenna rx;
	enum antenna tx;
};

/*
 * Quality statistics about the currently active link.
 */
struct link_qual {
	/*
	 * Statistics required for Link tuning.
	 * For the average RSSI value we use the "Walking average" approach.
	 * When adding RSSI to the average value the following calculation
	 * is needed:
	 *
	 *        avg_rssi = ((avg_rssi * 7) + rssi) / 8;
	 *
	 * The advantage of this approach is that we only need 1 variable
	 * to store the average in (No need for a count and a total).
	 * But more importantly, normal average values will over time
	 * move less and less towards newly added values this results
	 * that with link tuning, the device can have a very good RSSI
	 * for a few minutes but when the device is moved away from the AP
	 * the average will not decrease fast enough to compensate.
	 * The walking average compensates this and will move towards
	 * the new values correctly allowing a effective link tuning.
	 */
	int avg_rssi;
	int false_cca;

	/*
	 * Statistics required for Signal quality calculation.
	 * For calculating the Signal quality we have to determine
	 * the total number of success and failed RX and TX frames.
	 * After that we also use the average RSSI value to help
	 * determining the signal quality.
	 * For the calculation we will use the following algorithm:
	 *
	 *         rssi_percentage = (avg_rssi * 100) / rssi_offset
	 *         rx_percentage = (rx_success * 100) / rx_total
	 *         tx_percentage = (tx_success * 100) / tx_total
	 *         avg_signal = ((WEIGHT_RSSI * avg_rssi) +
	 *                       (WEIGHT_TX * tx_percentage) +
	 *                       (WEIGHT_RX * rx_percentage)) / 100
	 *
	 * This value should then be checked to not be greated then 100.
	 */
	int rx_percentage;
	int rx_success;
	int rx_failed;
	int tx_percentage;
	int tx_success;
	int tx_failed;
#define WEIGHT_RSSI	20
#define WEIGHT_RX	40
#define WEIGHT_TX	40
};

/*
 * Antenna settings about the currently active link.
 */
struct link_ant {
	/*
	 * Antenna flags
	 */
	unsigned int flags;
#define ANTENNA_RX_DIVERSITY	0x00000001
#define ANTENNA_TX_DIVERSITY	0x00000002
#define ANTENNA_MODE_SAMPLE	0x00000004

	/*
	 * Currently active TX/RX antenna setup.
	 * When software diversity is used, this will indicate
	 * which antenna is actually used at this time.
	 */
	struct antenna_setup active;

	/*
	 * RSSI information for the different antenna's.
	 * These statistics are used to determine when
	 * to switch antenna when using software diversity.
	 *
	 *        rssi[0] -> Antenna A RSSI
	 *        rssi[1] -> Antenna B RSSI
	 */
	int rssi_history[2];

	/*
	 * Current RSSI average of the currently active antenna.
	 * Similar to the avg_rssi in the link_qual structure
	 * this value is updated by using the walking average.
	 */
	int rssi_ant;
};

/*
 * To optimize the quality of the link we need to store
 * the quality of received frames and periodically
 * optimize the link.
 */
struct link {
	/*
	 * Link tuner counter
	 * The number of times the link has been tuned
	 * since the radio has been switched on.
	 */
	u32 count;

	/*
	 * Quality measurement values.
	 */
	struct link_qual qual;

	/*
	 * TX/RX antenna setup.
	 */
	struct link_ant ant;

	/*
	 * Active VGC level
	 */
	int vgc_level;

	/*
	 * Work structure for scheduling periodic link tuning.
	 */
	struct delayed_work work;
};

/*
 * Small helper macro to work with moving/walking averages.
 */
#define MOVING_AVERAGE(__avg, __val, __samples) \
	( (((__avg) * ((__samples) - 1)) + (__val)) / (__samples) )

/*
 * When we lack RSSI information return something less then -80 to
 * tell the driver to tune the device to maximum sensitivity.
 */
#define DEFAULT_RSSI	( -128 )

/*
 * Link quality access functions.
 */
static inline int rt2x00_get_link_rssi(struct link *link)
{
	if (link->qual.avg_rssi && link->qual.rx_success)
		return link->qual.avg_rssi;
	return DEFAULT_RSSI;
}

static inline int rt2x00_get_link_ant_rssi(struct