/*
        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/leds.h>
#include <linux/mutex.h>
#include <linux/etherdevice.h>

#include <net/mac80211.h>

#include "rt2x00debug.h"
#include "rt2x00leds.h"
#include "rt2x00reg.h"
#include "rt2x00queue.h"

/*
 * Module information.
 */
#define DRV_VERSION     "2.2.1"
#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), __func__, __lvl, ##__args)

#define DEBUG_PRINTK_PROBE(__kernlvl, __lvl, __msg, __args...)  \
        printk(__kernlvl "%s -> %s: %s - " __msg,               \
               KBUILD_MODNAME, __func__, __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 + DIFS + \
                                  (8 * (IEEE80211_HEADER + ACK_SIZE)) )
#define SHORT_EIFS              ( SIFS + SHORT_DIFS + \
                                  (8 * (IEEE80211_HEADER + ACK_SIZE)) )

/*
 * 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;
};

/*
 * Channel information structure
 */
struct channel_info {
        unsigned int flags;
#define GEOGRAPHY_ALLOWED       0x00000001

        short tx_power1;
        short tx_power2;
};

/*
 * 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 link *link)
{
        if (link->ant.rssi_ant && link->qual.rx_success)
                return link->ant.rssi_ant;
        return DEFAULT_RSSI;
}

static inline void rt2x00_reset_link_ant_rssi(struct link *link)
{
        link->ant.rssi_ant = 0;
}

static inline int rt2x00_get_link_ant_rssi_history(struct link *link,
                                                   enum antenna ant)
{
        if (link->ant.rssi_history[ant - ANTENNA_A])
                return link->ant.rssi_history[ant - ANTENNA_A];
        return DEFAULT_RSSI;
}

static inline int rt2x00_update_ant_rssi(struct link *link, int rssi)
{
        int old_rssi = link->ant.rssi_history[link->ant.active.rx - ANTENNA_A];
        link->ant.rssi_history[link->ant.active.rx - ANTENNA_A] = rssi;
        return old_rssi;
}

/*
 * Interface structure
 * Per interface configuration details, this structure
 * is allocated as the private data for ieee80211_vif.
 */
struct rt2x00_intf {
        /*
         * All fields within the rt2x00_intf structure
         * must be protected with a spinlock.
         */
        spinlock_t lock;

        /*
         * BSS configuration. Copied from the structure
         * passed to us through the bss_info_changed()
         * callback funtion.
         */
        struct ieee80211_bss_conf conf;

        /*
         * MAC of the device.
         */
        u8 mac[ETH_ALEN];

        /*
         * BBSID of the AP to associate with.
         */
        u8 bssid[ETH_ALEN];

        /*
         * Entry in the beacon queue which belongs to
         * this interface. Each interface has its own
         * dedicated beacon entry.
         */
        struct queue_entry *beacon;

        /*
         * Actions that needed rescheduling.
         */
        unsigned int delayed_flags;
#define DELAYED_UPDATE_BEACON           0x00000001
#define DELAYED_CONFIG_ERP              0x00000002
#define DELAYED_LED_ASSOC               0x00000004

        /*
         * Software sequence counter, this is only required
         * for hardware which doesn't support hardware
         * sequence counting.
         */
        spinlock_t seqlock;
        u16 seqno;
};

static inline struct rt2x00_intf* vif_to_intf(struct ieee80211_vif *vif)
{
        return (struct rt2x00_intf *)vif->drv_priv;
}

/**
 * struct hw_mode_spec: Hardware specifications structure
 *
 * Details about the supported modes, rates and channels
 * of a particular chipset. This is used by rt2x00lib
 * to build the ieee80211_hw_mode array for mac80211.
 *
 * @supported_bands: Bitmask contained the supported bands (2.4GHz, 5.2GHz).
 * @supported_rates: Rate types which are supported (CCK, OFDM).
 * @num_channels: Number of supported channels. This is used as array size
 *      for @tx_power_a, @tx_power_bg and @channels.
 * @channels: Device/chipset specific channel values (See &struct rf_channel).
 * @channels_info: Additional information for channels (See &struct channel_info).
 */
struct hw_mode_spec {
        unsigned int supported_bands;
#define SUPPORT_BAND_2GHZ       0x00000001
#define SUPPORT_BAND_5GHZ       0x00000002

        unsigned int supported_rates;
#define SUPPORT_RATE_CCK        0x00000001
#define SUPPORT_RATE_OFDM       0x00000002

        unsigned int num_channels;
        const struct rf_channel *channels;
        const struct channel_info *channels_info;
};

/*
 * Configuration structure wrapper around the
 * mac80211 configuration structure.
 * When mac80211 configures the driver, rt2x00lib
 * can precalculate values which are equal for all
 * rt2x00 drivers. Those values can be stored in here.
 */
struct rt2x00lib_conf {
        struct ieee80211_conf *conf;

        struct rf_channel rf;
        struct channel_info channel;

        struct antenna_setup ant;

        enum ieee80211_band band;

        u32 basic_rates;
        u32 slot_time;

        short sifs;
        short pifs;
        short difs;
        short eifs;
};

/*
 * Configuration structure for erp settings.
 */
struct rt2x00lib_erp {
        int short_preamble;
        int cts_protection;

        int ack_timeout;
        int ack_consume_time;
};

/*
 * Configuration structure for hardware encryption.
 */
struct rt2x00lib_crypto {
        enum cipher cipher;

        enum set_key_cmd cmd;
        const u8 *address;

        u32 bssidx;
        u32 aid;

        u8 key[16];
        u8 tx_mic[8];
        u8 rx_mic[8];
};

/*
 * Configuration structure wrapper around the
 * rt2x00 interface configuration handler.
 */
struct rt2x00intf_conf {
        /*
         * Interface type
         */
        enum nl80211_iftype type;

        /*
         * TSF sync value, this is dependant on the operation type.
         */
        enum tsf_sync sync;

        /*
         * The MAC and BSSID addressess are simple array of bytes,
         * these arrays are little endian, so when sending the addressess
         * to the drivers, copy the it into a endian-signed variable.
         *
         * Note that all devices (except rt2500usb) have 32 bits
         * register word sizes. This means that whatever variable we
         * pass _must_ be a multiple of 32 bits. Otherwise the device
         * might not accept what we are sending to it.
         * This will also make it easier for the driver to write
         * the data to the device.
         */
        __le32 mac[2];
        __le32 bssid[2];
};

/*
 * rt2x00lib callback functions.
 */
struct rt2x00lib_ops {
        /*
         * Interrupt handlers.
         */
        irq_handler_t irq_handler;

        /*
         * Device init handlers.
         */
        int (*probe_hw) (struct rt2x00_dev *rt2x00dev);
        char *(*get_firmware_name) (struct rt2x00_dev *rt2x00dev);
        u16 (*get_firmware_crc) (const void *data, const size_t len);
        int (*load_firmware) (struct rt2x00_dev *rt2x00dev, const void *data,
                              const size_t len);

        /*
         * Device initialization/deinitialization handlers.
         */
        int (*initialize) (struct rt2x00_dev *rt2x00dev);
        void (*uninitialize) (struct rt2x00_dev *rt2x00dev);

        /*
         * queue initialization handlers
         */
        void (*init_rxentry) (struct rt2x00_dev *rt2x00dev,
                              struct queue_entry *entry);
        void (*init_txentry) (struct rt2x00_dev *rt2x00dev,
                              struct queue_entry *entry);

        /*
         * Radio control handlers.
         */
        int (*set_device_state) (struct rt2x00_dev *rt2x00dev,
                                 enum dev_state state);
        int (*rfkill_poll) (struct rt2x00_dev *rt2x00dev);
        void (*link_stats) (struct rt2x00_dev *rt2x00dev,
                            struct link_qual *qual);
        void (*reset_tuner) (struct rt2x00_dev *rt2x00dev);
        void (*link_tuner) (struct rt2x00_dev *rt2x00dev);

        /*
         * TX control handlers
         */
        void (*write_tx_desc) (struct rt2x00_dev *rt2x00dev,
                               struct sk_buff *skb,
                               struct txentry_desc *txdesc);
        int (*write_tx_data) (struct queue_entry *entry);
        void (*write_beacon) (struct queue_entry *entry);
        int (*get_tx_data_len) (struct rt2x00_dev *rt2x00dev,
                                struct sk_buff *skb);
        void (*kick_tx_queue) (struct rt2x00_dev *rt2x00dev,
                               const enum data_queue_qid queue);

        /*
         * RX control handlers
         */
        void (*fill_rxdone) (struct queue_entry *entry,
                             struct rxdone_entry_desc *rxdesc);

        /*
         * Configuration handlers.
         */
        int (*config_shared_key) (struct rt2x00_dev *rt2x00dev,
                                  struct rt2x00lib_crypto *crypto,
                                  struct ieee80211_key_conf *key);
        int (*config_pairwise_key) (struct rt2x00_dev *rt2x00dev,
                                    struct rt2x00lib_crypto *crypto,
                                    struct ieee80211_key_conf *key);
        void (*config_filter) (struct rt2x00_dev *rt2x00dev,
                               const unsigned int filter_flags);
        void (*config_intf) (struct rt2x00_dev *rt2x00dev,
                             struct rt2x00_intf *intf,
                             struct rt2x00intf_conf *conf,
                             const unsigned int flags);
#define CONFIG_UPDATE_TYPE              ( 1 << 1 )
#define CONFIG_UPDATE_MAC               ( 1 << 2 )
#define CONFIG_UPDATE_BSSID             ( 1 << 3 )

        void (*config_erp) (struct rt2x00_dev *rt2x00dev,
                            struct rt2x00lib_erp *erp);
        void (*config) (struct rt2x00_dev *rt2x00dev,
                        struct rt2x00lib_conf *libconf,
                        const unsigned int flags);
#define CONFIG_UPDATE_PHYMODE           ( 1 << 1 )
#define CONFIG_UPDATE_CHANNEL           ( 1 << 2 )
#define CONFIG_UPDATE_TXPOWER           ( 1 << 3 )
#define CONFIG_UPDATE_ANTENNA           ( 1 << 4 )
#define CONFIG_UPDATE_SLOT_TIME         ( 1 << 5 )
#define CONFIG_UPDATE_BEACON_INT        ( 1 << 6 )
#define CONFIG_UPDATE_ALL               0xffff
};

/*
 * rt2x00 driver callback operation structure.
 */
struct rt2x00_ops {
        const char *name;
        const unsigned int max_sta_intf;
        const unsigned int max_ap_intf;
        const unsigned int eeprom_size;
        const unsigned int rf_size;
        const unsigned int tx_queues;
        const struct data_queue_desc *rx;
        const struct data_queue_desc *tx;
        const struct data_queue_desc *bcn;
        const struct data_queue_desc *atim;
        const struct rt2x00lib_ops *lib;
        const struct ieee80211_ops *hw;
#ifdef CONFIG_RT2X00_LIB_DEBUGFS
        const struct rt2x00debug *debugfs;
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */
};

/*
 * rt2x00 device flags
 */
enum rt2x00_flags {
        /*
         * Device state flags
         */
        DEVICE_STATE_PRESENT,
        DEVICE_STATE_REGISTERED_HW,
        DEVICE_STATE_INITIALIZED,
        DEVICE_STATE_STARTED,
        DEVICE_STATE_STARTED_SUSPEND,
        DEVICE_STATE_ENABLED_RADIO,
        DEVICE_STATE_DISABLED_RADIO_HW,

        /*
         * Driver requirements
         */
        DRIVER_REQUIRE_FIRMWARE,
        DRIVER_REQUIRE_BEACON_GUARD,
        DRIVER_REQUIRE_ATIM_QUEUE,
        DRIVER_REQUIRE_SCHEDULED,
        DRIVER_REQUIRE_DMA,

        /*
         * Driver features
         */
        CONFIG_SUPPORT_HW_BUTTON,
        CONFIG_SUPPORT_HW_CRYPTO,

        /*
         * Driver configuration
         */
        CONFIG_FRAME_TYPE,
        CONFIG_RF_SEQUENCE,
        CONFIG_EXTERNAL_LNA_A,
        CONFIG_EXTERNAL_LNA_BG,
        CONFIG_DOUBLE_ANTENNA,
        CONFIG_DISABLE_LINK_TUNING,
};

/*
 * rt2x00 device structure.
 */
struct rt2x00_dev {
        /*
         * Device structure.
         * The structure stored in here depends on the
         * system bus (PCI or USB).
         * When accessing this variable, the rt2x00dev_{pci,usb}
         * macro's should be used for correct typecasting.
         */
        struct device *dev;

        /*
         * Callback functions.
         */
        const struct rt2x00_ops *ops;

        /*
         * IEEE80211 control structure.
         */
        struct ieee80211_hw *hw;
        struct ieee80211_supported_band bands[IEEE80211_NUM_BANDS];
        enum ieee80211_band curr_band;

        /*
         * rfkill structure for RF state switching support.
         * This will only be compiled in when required.
         */
#ifdef CONFIG_RT2X00_LIB_RFKILL
        unsigned long rfkill_state;
#define RFKILL_STATE_ALLOCATED          1
#define RFKILL_STATE_REGISTERED         2
        struct rfkill *rfkill;
        struct delayed_work rfkill_work;
#endif /* CONFIG_RT2X00_LIB_RFKILL */

        /*
         * If enabled, the debugfs interface structures
         * required for deregistration of debugfs.
         */
#ifdef CONFIG_RT2X00_LIB_DEBUGFS
        struct rt2x00debug_intf *debugfs_intf;
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

        /*
         * LED structure for changing the LED status
         * by mac8011 or the kernel.
         */
#ifdef CONFIG_RT2X00_LIB_LEDS
        struct rt2x00_led led_radio;
        struct rt2x00_led led_assoc;
        struct rt2x00_led led_qual;
        u16 led_mcu_reg;
#endif /* CONFIG_RT2X00_LIB_LEDS */

        /*
         * Device flags.
         * In these flags the current status and some
         * of the device capabilities are stored.
         */
        unsigned long flags;

        /*
         * Chipset identification.
         */
        struct rt2x00_chip chip;

        /*
         * hw capability specifications.
         */
        struct hw_mode_spec spec;

        /*
         * This is the default TX/RX antenna setup as indicated
         * by the device's EEPROM. When mac80211 sets its
         * antenna value to 0 we should be using these values.
         */
        struct antenna_setup default_ant;

        /*
         * Register pointers
         * csr.base: CSR base register address. (PCI)
         * csr.cache: CSR cache for usb_control_msg. (USB)
         */
        union csr {
                void __iomem *base;
                void *cache;
        } csr;

        /*
         * Mutex to protect register accesses on USB devices.
         * There are 2 reasons this is needed, one is to ensure
         * use of the csr_cache (for USB devices) by one thread
         * isn't corrupted by another thread trying to access it.
         * The other is that access to BBP and RF registers
         * require multiple BUS transactions and if another thread
         * attempted to access one of those registers at the same
         * time one of the writes could silently fail.
         */
        struct mutex usb_cache_mutex;

        /*
         * Current packet filter configuration for the device.
         * This contains all currently active FIF_* flags send
         * to us by mac80211 during configure_filter().
         */
        unsigned int packet_filter;

        /*
         * Interface details:
         *  - Open ap interface count.
         *  - Open sta interface count.
         *  - Association count.
         */
        unsigned int intf_ap_count;
        unsigned int intf_sta_count;
        unsigned int intf_associated;

        /*
         * Link quality
         */
        struct link link;

        /*
         * EEPROM data.
         */
        __le16 *eeprom;

        /*
         * Active RF register values.
         * These are stored here so we don't need
         * to read the rf registers and can directly
         * use this value instead.
         * This field should be accessed by using
         * rt2x00_rf_read() and rt2x00_rf_write().
         */
        u32 *rf;

        /*
         * LNA gain
         */
        short lna_gain;

        /*
         * USB Max frame size (for rt2500usb & rt73usb).
         */
        u16 usb_maxpacket;

        /*
         * Current TX power value.
         */
        u16 tx_power;

        /*
         * Rssi <-> Dbm offset
         */
        u8 rssi_offset;

        /*
         * Frequency offset (for rt61pci & rt73usb).
         */
        u8 freq_offset;

        /*
         * Low level statistics which will have
         * to be kept up to date while device is running.
         */
        struct ieee80211_low_level_stats low_level_stats;

        /*
         * RX configuration information.
         */
        struct ieee80211_rx_status rx_status;

        /*
         * Scheduled work.
         * NOTE: intf_work will use ieee80211_iterate_active_interfaces()
         * which means it cannot be placed on the hw->workqueue
         * due to RTNL locking requirements.
         */
        struct work_struct intf_work;
        struct work_struct filter_work;

        /*
         * Data queue arrays for RX, TX and Beacon.
         * The Beacon array also contains the Atim queue
         * if that is supported by the device.
         */
        unsigned int data_queues;
        struct data_queue *rx;
        struct data_queue *tx;
        struct data_queue *bcn;

        /*
         * Firmware image.
         */
        const struct firmware *fw;
};

/*
 * Generic RF access.
 * The RF is being accessed by word index.
 */
static inline void rt2x00_rf_read(struct rt2x00_dev *rt2x00dev,
                                  const unsigned int word, u32 *data)
{
        *data = rt2x00dev->rf[word];
}

static inline void rt2x00_rf_write(struct rt2x00_dev *rt2x00dev,
                                   const unsigned int word, u32 data)
{
        rt2x00dev->rf[word] = data;
}

/*
 *  Generic EEPROM access.
 * The EEPROM is being accessed by word index.
 */
static inline void *rt2x00_eeprom_addr(struct rt2x00_dev *rt2x00dev,
                                       const unsigned int word)
{
        return (void *)&rt2x00dev->eeprom[word];
}

static inline void rt2x00_eeprom_read(struct rt2x00_dev *rt2x00dev,
                                      const unsigned int word, u16 *data)
{
        *data = le16_to_cpu(rt2x00dev->eeprom[word]);
}

static inline void rt2x00_eeprom_write(struct rt2x00_dev *rt2x00dev,
                                       const unsigned int word, u16 data)
{
        rt2x00dev->eeprom[word] = cpu_to_le16(data);
}

/*
 * Chipset handlers
 */
static inline void rt2x00_set_chip(struct rt2x00_dev *rt2x00dev,
                                   const u16 rt, const u16 rf, const u32 rev)
{
        INFO(rt2x00dev,
             "Chipset detected - rt: %04x, rf: %04x, rev: %08x.\n",
             rt, rf, rev);

        rt2x00dev->chip.rt = rt;
        rt2x00dev->chip.rf = rf;
        rt2x00dev->chip.rev = rev;
}

static inline char rt2x00_rt(const struct rt2x00_chip *chipset, const u16 chip)
{
        return (chipset->rt == chip);
}

static inline char rt2x00_rf(const struct rt2x00_chip *chipset, const u16 chip)
{
        return (chipset->rf == chip);
}

static inline u16 rt2x00_rev(const struct rt2x00_chip *chipset)
{
        return chipset->rev;
}

static inline u16 rt2x00_check_rev(const struct rt2x00_chip *chipset,
                                   const u32 rev)
{
        return (((chipset->rev & 0xffff0) == rev) &&
                !!(chipset->rev & 0x0000f));
}

/*
 * Duration calculations
 * The rate variable passed is: 100kbs.
 * To convert from bytes to bits we multiply size with 8,
 * then the size is multiplied with 10 to make the
 * real rate -> rate argument correction.
 */
static inline u16 get_duration(const unsigned int size, const u8 rate)
{
        return ((size * 8 * 10) / rate);
}

static inline u16 get_duration_res(const unsigned int size, const u8 rate)
{
        return ((size * 8 * 10) % rate);
}

/**
 * rt2x00queue_map_txskb - Map a skb into DMA for TX purposes.
 * @rt2x00dev: Pointer to &struct rt2x00_dev.
 * @skb: The skb to map.
 */
void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb);

/**
 * rt2x00queue_get_queue - Convert queue index to queue pointer
 * @rt2x00dev: Pointer to &struct rt2x00_dev.
 * @queue: rt2x00 queue index (see &enum data_queue_qid).
 */
struct data_queue *rt2x00queue_get_queue(struct rt2x00_dev *rt2x00dev,
                                         const enum data_queue_qid queue);

/**
 * rt2x00queue_get_entry - Get queue entry where the given index points to.
 * @queue: Pointer to &struct data_queue from where we obtain the entry.
 * @index: Index identifier for obtaining the correct index.
 */
struct queue_entry *rt2x00queue_get_entry(struct data_queue *queue,
                                          enum queue_index index);

/*
 * Interrupt context handlers.
 */
void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev);
void rt2x00lib_txdone(struct queue_entry *entry,
                      struct txdone_entry_desc *txdesc);
void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
                      struct queue_entry *entry);

/*
 * mac80211 handlers.
 */
int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb);
int rt2x00mac_start(struct ieee80211_hw *hw);
void rt2x00mac_stop(struct ieee80211_hw *hw);
int rt2x00mac_add_interface(struct ieee80211_hw *hw,
                            struct ieee80211_if_init_conf *conf);
void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
                                struct ieee80211_if_init_conf *conf);
int rt2x00mac_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf);

int rt2x00mac_config_interface(struct ieee80211_hw *hw,
                               struct ieee80211_vif *vif,
                               struct ieee80211_if_conf *conf);
void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
                                unsigned int changed_flags,
                                unsigned int *total_flags,
                                int mc_count, struct dev_addr_list *mc_list);
#ifdef CONFIG_RT2X00_LIB_CRYPTO
int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                      const u8 *local_address, const u8 *address,
                      struct ieee80211_key_conf *key);
#else
#define rt2x00mac_set_key       NULL
#endif /* CONFIG_RT2X00_LIB_CRYPTO */
int rt2x00mac_get_stats(struct ieee80211_hw *hw,
                        struct ieee80211_low_level_stats *stats);
int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
                           struct ieee80211_tx_queue_stats *stats);
void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
                                struct ieee80211_vif *vif,
                                struct ieee80211_bss_conf *bss_conf,
                                u32 changes);
int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue,
                      const struct ieee80211_tx_queue_params *params);

/*
 * Driver allocation handlers.
 */
int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev);
void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev);
#ifdef CONFIG_PM
int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state);
int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev);
#endif /* CONFIG_PM */

#endif /* RT2X00_H */