text: /******************************************************************************
   *
   * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of version 2 of the GNU General Public License as
   * published by the Free Software Foundation.
   *
   * 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.,
   * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
   *
   * The full GNU General Public License is included in this distribution in the
   * file called LICENSE.
   *
   * Contact Information:
   *  Intel Linux Wireless <ilw@linux.intel.com>
   * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   *
   *****************************************************************************/
  /*
   * Please use this file (iwl-dev.h) for driver implementation definitions.
   * Please use iwl-commands.h for uCode API definitions.
   * Please use iwl-4965-hw.h for hardware-related definitions.
   */
  
  #ifndef __iwl_dev_h__
  #define __iwl_dev_h__
  
  #include <linux/pci.h> /* for struct pci_device_id */
  #include <linux/kernel.h>
  #include <net/ieee80211_radiotap.h>
  
  #include "iwl-eeprom.h"
  #include "iwl-csr.h"
  #include "iwl-prph.h"
  #include "iwl-fh.h"
  #include "iwl-debug.h"
  #include "iwl-4965-hw.h"
  #include "iwl-3945-hw.h"
  #include "iwl-3945-led.h"
  #include "iwl-led.h"
  #include "iwl-power.h"
  #include "iwl-agn-rs.h"
  
  /* configuration for the iwl4965 */
  extern struct iwl_cfg iwl4965_agn_cfg;
  extern struct iwl_cfg iwl5300_agn_cfg;
  extern struct iwl_cfg iwl5100_agn_cfg;
  extern struct iwl_cfg iwl5350_agn_cfg;
  extern struct iwl_cfg iwl5100_bgn_cfg;
  extern struct iwl_cfg iwl5100_abg_cfg;
  extern struct iwl_cfg iwl5150_agn_cfg;
  extern struct iwl_cfg iwl5150_abg_cfg;
  extern struct iwl_cfg iwl6000h_2agn_cfg;
  extern struct iwl_cfg iwl6000i_2agn_cfg;
  extern struct iwl_cfg iwl6000_3agn_cfg;
  extern struct iwl_cfg iwl6050_2agn_cfg;
  extern struct iwl_cfg iwl6050_3agn_cfg;
  extern struct iwl_cfg iwl1000_bgn_cfg;
  
  struct iwl_tx_queue;
  
  /* shared structures from iwl-5000.c */
  extern struct iwl_mod_params iwl50_mod_params;
  extern struct iwl_ops iwl5000_ops;
  extern struct iwl_ucode_ops iwl5000_ucode;
  extern struct iwl_lib_ops iwl5000_lib;
  extern struct iwl_hcmd_ops iwl5000_hcmd;
  extern struct iwl_hcmd_utils_ops iwl5000_hcmd_utils;
  
  /* shared functions from iwl-5000.c */
  extern u16 iwl5000_get_hcmd_size(u8 cmd_id, u16 len);
  extern u16 iwl5000_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd,
  				     u8 *data);
  extern void iwl5000_rts_tx_cmd_flag(struct ieee80211_tx_info *info,
  				    __le32 *tx_flags);
  extern int iwl5000_calc_rssi(struct iwl_priv *priv,
  			     struct iwl_rx_phy_res *rx_resp);
  extern int iwl5000_apm_init(struct iwl_priv *priv);
  extern void iwl5000_apm_stop(struct iwl_priv *priv);
  extern int iwl5000_apm_reset(struct iwl_priv *priv);
  extern void iwl5000_nic_config(struct iwl_priv *priv);
  extern u16 iwl5000_eeprom_calib_version(struct iwl_priv *priv);
  extern const u8 *iwl5000_eeprom_query_addr(const struct iwl_priv *priv,
  				    size_t offset);
  extern void iwl5000_txq_update_byte_cnt_tbl(struct iwl_priv *priv,
  					    struct iwl_tx_queue *txq,
  					    u16 byte_cnt);
  extern void iwl5000_txq_inval_byte_cnt_tbl(struct iwl_priv *priv,
  				    struct iwl_tx_queue *txq);
  extern int iwl5000_load_ucode(struct iwl_priv *priv);
  extern void iwl5000_init_alive_start(struct iwl_priv *priv);
  extern int iwl5000_alive_notify(struct iwl_priv *priv);
  extern int iwl5000_hw_set_hw_params(struct iwl_priv *priv);
  extern int iwl5000_txq_agg_enable(struct iwl_priv *priv, int txq_id,
  			   int tx_fifo, int sta_id, int tid, u16 ssn_idx);
  extern int iwl5000_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
  			    u16 ssn_idx, u8 tx_fifo);
  extern void iwl5000_txq_set_sched(struct iwl_priv *priv, u32 mask);
  extern void iwl5000_setup_deferred_work(struct iwl_priv *priv);
  extern void iwl5000_rx_handler_setup(struct iwl_priv *priv);
  extern int iwl5000_hw_valid_rtc_data_addr(u32 addr);
  extern int iwl5000_send_tx_power(struct iwl_priv *priv);
  extern void iwl5000_temperature(struct iwl_priv *priv);
  
  /* CT-KILL constants */
  #define CT_KILL_THRESHOLD_LEGACY   110 /* in Celsius */
  #define CT_KILL_THRESHOLD	   114 /* in Celsius */
  #define CT_KILL_EXIT_THRESHOLD     95  /* in Celsius */
  
  /* Default noise level to report when noise measurement is not available.
   *   This may be because we're:
   *   1)  Not associated (4965, no beacon statistics being sent to driver)
   *   2)  Scanning (noise measurement does not apply to associated channel)
   *   3)  Receiving CCK (3945 delivers noise info only for OFDM frames)
   * Use default noise value of -127 ... this is below the range of measurable
   *   Rx dBm for either 3945 or 4965, so it can indicate "unmeasurable" to user.
   *   Also, -127 works better than 0 when averaging frames with/without
   *   noise info (e.g. averaging might be done in app); measured dBm values are
   *   always negative ... using a negative value as the default keeps all
   *   averages within an s8's (used in some apps) range of negative values. */
  #define IWL_NOISE_MEAS_NOT_AVAILABLE (-127)
  
  /*
   * RTS threshold here is total size [2347] minus 4 FCS bytes
   * Per spec:
   *   a value of 0 means RTS on all data/management packets
   *   a value > max MSDU size means no RTS
   * else RTS for data/management frames where MPDU is larger
   *   than RTS value.
   */
  #define DEFAULT_RTS_THRESHOLD     2347U
  #define MIN_RTS_THRESHOLD         0U
  #define MAX_RTS_THRESHOLD         2347U
  #define MAX_MSDU_SIZE		  2304U
  #define MAX_MPDU_SIZE		  2346U
  #define DEFAULT_BEACON_INTERVAL   100U
  #define	DEFAULT_SHORT_RETRY_LIMIT 7U
  #define	DEFAULT_LONG_RETRY_LIMIT  4U
  
  struct iwl_rx_mem_buffer {
  	dma_addr_t real_dma_addr;
  	dma_addr_t aligned_dma_addr;
  	struct sk_buff *skb;
  	struct list_head list;
  };
  
  /* defined below */
  struct iwl_device_cmd;
  
  struct iwl_cmd_meta {
  	/* only for SYNC commands, iff the reply skb is wanted */
  	struct iwl_host_cmd *source;
  	/*
  	 * only for ASYNC commands
  	 * (which is somewhat stupid -- look at iwl-sta.c for instance
  	 * which duplicates a bunch of code because the callback isn't
  	 * invoked for SYNC commands, if it were and its result passed
  	 * through it would be simpler...)
  	 */
  	void (*callback)(struct iwl_priv *priv,
  			 struct iwl_device_cmd *cmd,
  			 struct sk_buff *skb);
  
  	/* The CMD_SIZE_HUGE flag bit indicates that the command
  	 * structure is stored at the end of the shared queue memory. */
  	u32 flags;
  
  	DECLARE_PCI_UNMAP_ADDR(mapping)
  	DECLARE_PCI_UNMAP_LEN(len)
  };
  
  /*
   * Generic queue structure
   *
   * Contains common data for Rx and Tx queues
   */
  struct iwl_queue {
  	int n_bd;              /* number of BDs in this queue */
  	int write_ptr;       /* 1-st empty entry (index) host_w*/
  	int read_ptr;         /* last used entry (index) host_r*/
  	dma_addr_t dma_addr;   /* physical addr for BD's */
  	int n_window;	       /* safe queue window */
  	u32 id;
  	int low_mark;	       /* low watermark, resume queue if free
  				* space more than this */
  	int high_mark;         /* high watermark, stop queue if free
  				* space less than this */
  } __attribute__ ((packed));
  
  /* One for each TFD */
  struct iwl_tx_info {
  	struct sk_buff *skb[IWL_NUM_OF_TBS - 1];
  };
  
  /**
   * struct iwl_tx_queue - Tx Queue for DMA
   * @q: generic Rx/Tx queue descriptor
   * @bd: base of circular buffer of TFDs
   * @cmd: array of command/TX buffer pointers
   * @meta: array of meta data for each command/tx buffer
   * @dma_addr_cmd: physical address of cmd/tx buffer array
   * @txb: array of per-TFD driver data
   * @need_update: indicates need to update read/write index
   * @sched_retry: indicates queue is high-throughput aggregation (HT AGG) enabled
   *
   * A Tx queue consists of circular buffer of BDs (a.k.a. TFDs, transmit frame
   * descriptors) and required locking structures.
   */
  #define TFD_TX_CMD_SLOTS 256
  #define TFD_CMD_SLOTS 32
  
  struct iwl_tx_queue {
  	struct iwl_queue q;
  	void *tfds;
  	struct iwl_device_cmd **cmd;
  	struct iwl_cmd_meta *meta;
  	struct iwl_tx_info *txb;
  	u8 need_update;
  	u8 sched_retry;
  	u8 active;
  	u8 swq_id;
  };
  
  #define IWL_NUM_SCAN_RATES         (2)
  
  struct iwl4965_channel_tgd_info {
  	u8 type;
  	s8 max_power;
  };
  
  struct iwl4965_channel_tgh_info {
  	s64 last_radar_time;
  };
  
  #define IWL4965_MAX_RATE (33)
  
  struct iwl3945_clip_group {
  	/* maximum power level to prevent clipping for each rate, derived by
  	 *   us from this band's saturation power in EEPROM */
  	const s8 clip_powers[IWL_MAX_RATES];
  };
  
  /* current Tx power values to use, one for each rate for each channel.
   * requested power is limited by:
   * -- regulatory EEPROM limits for this channel
   * -- hardware capabilities (clip-powers)
   * -- spectrum management
   * -- user preference (e.g. iwconfig)
   * when requested power is set, base power index must also be set. */
  struct iwl3945_channel_power_info {
  	struct iwl3945_tx_power tpc;	/* actual radio and DSP gain settings */
  	s8 power_table_index;	/* actual (compenst'd) index into gain table */
  	s8 base_power_index;	/* gain index for power at factory temp. */
  	s8 requested_power;	/* power (dBm) requested for this chnl/rate */
  };
  
  /* current scan Tx power values to use, one for each scan rate for each
   * channel. */
  struct iwl3945_scan_power_info {
  	struct iwl3945_tx_power tpc;	/* actual radio and DSP gain settings */
  	s8 power_table_index;	/* actual (compenst'd) index into gain table */
  	s8 requested_power;	/* scan pwr (dBm) requested for chnl/rate */
  };
  
  /*
   * One for each channel, holds all channel setup data
   * Some of the fields (e.g. eeprom and flags/max_power_avg) are redundant
   *     with one another!
   */
  struct iwl_channel_info {
  	struct iwl4965_channel_tgd_info tgd;
  	struct iwl4965_channel_tgh_info tgh;
  	struct iwl_eeprom_channel eeprom;	/* EEPROM regulatory limit */
  	struct iwl_eeprom_channel ht40_eeprom;	/* EEPROM regulatory limit for
  						 * HT40 channel */
  
  	u8 channel;	  /* channel number */
  	u8 flags;	  /* flags copied from EEPROM */
  	s8 max_power_avg; /* (dBm) regul. eeprom, normal Tx, any rate */
  	s8 curr_txpow;	  /* (dBm) regulatory/spectrum/user (not h/w) limit */
  	s8 min_power;	  /* always 0 */
  	s8 scan_power;	  /* (dBm) regul. eeprom, direct scans, any rate */
  
  	u8 group_index;	  /* 0-4, maps channel to group1/2/3/4/5 */
  	u8 band_index;	  /* 0-4, maps channel to band1/2/3/4/5 */
  	enum ieee80211_band band;
  
  	/* HT40 channel info */
  	s8 ht40_max_power_avg;	/* (dBm) regul. eeprom, normal Tx, any rate */
  	s8 ht40_curr_txpow;	/* (dBm) regulatory/spectrum/user (not h/w) */
  	s8 ht40_min_power;	/* always 0 */
  	s8 ht40_scan_power;	/* (dBm) eeprom, direct scans, any rate */
  	u8 ht40_flags;		/* flags copied from EEPROM */
  	u8 ht40_extension_channel; /* HT_IE_EXT_CHANNEL_* */
  
  	/* Radio/DSP gain settings for each "normal" data Tx rate.
  	 * These include, in addition to RF and DSP gain, a few fields for
  	 *   remembering/modifying gain settings (indexes). */
  	struct iwl3945_channel_power_info power_info[IWL4965_MAX_RATE];
  
  	/* Radio/DSP gain settings for each scan rate, for directed scans. */
  	struct iwl3945_scan_power_info scan_pwr_info[IWL_NUM_SCAN_RATES];
  };
  
  #define IWL_TX_FIFO_AC0	0
  #define IWL_TX_FIFO_AC1	1
  #define IWL_TX_FIFO_AC2	2
  #define IWL_TX_FIFO_AC3	3
  #define IWL_TX_FIFO_HCCA_1	5
  #define IWL_TX_FIFO_HCCA_2	6
  #define IWL_TX_FIFO_NONE	7
  
  /* Minimum number of queues. MAX_NUM is defined in hw specific files.
   * Set the minimum to accommodate the 4 standard TX queues, 1 command
   * queue, 2 (unused) HCCA queues, and 4 HT queues (one for each AC) */
  #define IWL_MIN_NUM_QUEUES	10
  
  /* Power management (not Tx power) structures */
  
  enum iwl_pwr_src {
  	IWL_PWR_SRC_VMAIN,
  	IWL_PWR_SRC_VAUX,
  };
  
  #define IEEE80211_DATA_LEN              2304
  #define IEEE80211_4ADDR_LEN             30
  #define IEEE80211_HLEN                  (IEEE80211_4ADDR_LEN)
  #define IEEE80211_FRAME_LEN             (IEEE80211_DATA_LEN + IEEE80211_HLEN)
  
  struct iwl_frame {
  	union {
  		struct ieee80211_hdr frame;
  		struct iwl_tx_beacon_cmd beacon;
  		u8 raw[IEEE80211_FRAME_LEN];
  		u8 cmd[360];
  	} u;
  	struct list_head list;
  };
  
  #define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
  #define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
  #define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)
  
  enum {
  	CMD_SYNC = 0,
  	CMD_SIZE_NORMAL = 0,
  	CMD_NO_SKB = 0,
  	CMD_SIZE_HUGE = (1 << 0),
  	CMD_ASYNC = (1 << 1),
  	CMD_WANT_SKB = (1 << 2),
  };
  
  #define IWL_CMD_MAX_PAYLOAD 320
  
  /**
   * struct iwl_device_cmd
   *
   * For allocation of the command and tx queues, this establishes the overall
   * size of the largest command we send to uCode, except for a scan command
   * (which is relatively huge; space is allocated separately).
   */
  struct iwl_device_cmd {
  	struct iwl_cmd_header hdr;	/* uCode API */
  	union {
  		u32 flags;
  		u8 val8;
  		u16 val16;
  		u32 val32;
  		struct iwl_tx_cmd tx;
  		u8 payload[IWL_CMD_MAX_PAYLOAD];
  	} __attribute__ ((packed)) cmd;
  } __attribute__ ((packed));
  
  #define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
  
  
  struct iwl_host_cmd {
  	const void *data;
  	struct sk_buff *reply_skb;
  	void (*callback)(struct iwl_priv *priv,
  			 struct iwl_device_cmd *cmd,
  			 struct sk_buff *skb);
  	u32 flags;
  	u16 len;
  	u8 id;
  };
  
  /*
   * RX related structures and functions
   */
  #define RX_FREE_BUFFERS 64
  #define RX_LOW_WATERMARK 8
  
  #define SUP_RATE_11A_MAX_NUM_CHANNELS  8
  #define SUP_RATE_11B_MAX_NUM_CHANNELS  4
  #define SUP_RATE_11G_MAX_NUM_CHANNELS  12
  
  /**
   * struct iwl_rx_queue - Rx queue
   * @bd: driver's pointer to buffer of receive buffer descriptors (rbd)
   * @dma_addr: bus address of buffer of receive buffer descriptors (rbd)
   * @read: Shared index to newest available Rx buffer
   * @write: Shared index to oldest written Rx packet
   * @free_count: Number of pre-allocated buffers in rx_free
   * @rx_free: list of free SKBs for use
   * @rx_used: List of Rx buffers with no SKB
   * @need_update: flag to indicate we need to update read/write index
   * @rb_stts: driver's pointer to receive buffer status
   * @rb_stts_dma: bus address of receive buffer status
   *
   * NOTE:  rx_free and rx_used are used as a FIFO for iwl_rx_mem_buffers
   */
  struct iwl_rx_queue {
  	__le32 *bd;
  	dma_addr_t dma_addr;
  	struct iwl_rx_mem_buffer pool[RX_QUEUE_SIZE + RX_FREE_BUFFERS];
  	struct iwl_rx_mem_buffer *queue[RX_QUEUE_SIZE];
  	u32 read;
  	u32 write;
  	u32 free_count;
  	u32 write_actual;
  	struct list_head rx_free;
  	struct list_head rx_used;
  	int need_update;
  	struct iwl_rb_status *rb_stts;
  	dma_addr_t rb_stts_dma;
  	spinlock_t lock;
  };
  
  #define IWL_SUPPORTED_RATES_IE_LEN         8
  
  #define MAX_TID_COUNT        9
  
  #define IWL_INVALID_RATE     0xFF
  #define IWL_INVALID_VALUE    -1
  
  /**
   * struct iwl_ht_agg -- aggregation status while waiting for block-ack
   * @txq_id: Tx queue used for Tx attempt
   * @frame_count: # frames attempted by Tx command
   * @wait_for_ba: Expect block-ack before next Tx reply
   * @start_idx: Index of 1st Transmit Frame Descriptor (TFD) in Tx window
   * @bitmap0: Low order bitmap, one bit for each frame pending ACK in Tx window
   * @bitmap1: High order, one bit for each frame pending ACK in Tx window
   * @rate_n_flags: Rate at which Tx was attempted
   *
   * If REPLY_TX indicates that aggregation was attempted, driver must wait
   * for block ack (REPLY_COMPRESSED_BA).  This struct stores tx reply info
   * until block ack arrives.
   */
  struct iwl_ht_agg {
  	u16 txq_id;
  	u16 frame_count;
  	u16 wait_for_ba;
  	u16 start_idx;
  	u64 bitmap;
  	u32 rate_n_flags;
  #define IWL_AGG_OFF 0
  #define IWL_AGG_ON 1
  #define IWL_EMPTYING_HW_QUEUE_ADDBA 2
  #define IWL_EMPTYING_HW_QUEUE_DELBA 3
  	u8 state;
  };
  
  
  struct iwl_tid_data {
  	u16 seq_number;
  	u16 tfds_in_queue;
  	struct iwl_ht_agg agg;
  };
  
  struct iwl_hw_key {
  	enum ieee80211_key_alg alg;
  	int keylen;
  	u8 keyidx;
  	u8 key[32];
  };
  
  union iwl_ht_rate_supp {
  	u16 rates;
  	struct {
  		u8 siso_rate;
  		u8 mimo_rate;
  	};
  };
  
  #define CFG_HT_RX_AMPDU_FACTOR_DEF  (0x3)
  
  /*
   * Maximal MPDU density for TX aggregation
   * 4 - 2us density
   * 5 - 4us density
   * 6 - 8us density
   * 7 - 16us density
   */
  #define CFG_HT_MPDU_DENSITY_4USEC   (0x5)
  #define CFG_HT_MPDU_DENSITY_DEF CFG_HT_MPDU_DENSITY_4USEC
  
  struct iwl_ht_info {
  	/* self configuration data */
  	u8 is_ht;
  	u8 supported_chan_width;
  	u8 sm_ps;
  	struct ieee80211_mcs_info mcs;
  	/* BSS related data */
  	u8 extension_chan_offset;
  	u8 ht_protection;
  	u8 non_GF_STA_present;
  };
  
  union iwl_qos_capabity {
  	struct {
  		u8 edca_count:4;	/* bit 0-3 */
  		u8 q_ack:1;		/* bit 4 */
  		u8 queue_request:1;	/* bit 5 */
  		u8 txop_request:1;	/* bit 6 */
  		u8 reserved:1;		/* bit 7 */
  	} q_AP;
  	struct {
  		u8 acvo_APSD:1;		/* bit 0 */
  		u8 acvi_APSD:1;		/* bit 1 */
  		u8 ac_bk_APSD:1;	/* bit 2 */
  		u8 ac_be_APSD:1;	/* bit 3 */
  		u8 q_ack:1;		/* bit 4 */
  		u8 max_len:2;		/* bit 5-6 */
  		u8 more_data_ack:1;	/* bit 7 */
  	} q_STA;
  	u8 val;
  };
  
  /* QoS structures */
  struct iwl_qos_info {
  	int qos_active;
  	union iwl_qos_capabity qos_cap;
  	struct iwl_qosparam_cmd def_qos_parm;
  };
  
  #define STA_PS_STATUS_WAKE             0
  #define STA_PS_STATUS_SLEEP            1
  
  
  struct iwl3945_station_entry {
  	struct iwl3945_addsta_cmd sta;
  	struct iwl_tid_data tid[MAX_TID_COUNT];
  	u8 used;
  	u8 ps_status;
  	struct iwl_hw_key keyinfo;
  };
  
  struct iwl_station_entry {
  	struct iwl_addsta_cmd sta;
  	struct iwl_tid_data tid[MAX_TID_COUNT];
  	u8 used;
  	u8 ps_status;
  	struct iwl_hw_key keyinfo;
  };
  
  /* one for each uCode image (inst/data, boot/init/runtime) */
  struct fw_desc {
  	void *v_addr;		/* access by driver */
  	dma_addr_t p_addr;	/* access by card's busmaster DMA */
  	u32 len;		/* bytes */
  };
  
  /* uCode file layout */
  struct iwl_ucode_header {
  	__le32 ver;	/* major/minor/API/serial */
  	union {
  		struct {
  			__le32 inst_size;	/* bytes of runtime code */
  			__le32 data_size;	/* bytes of runtime data */
  			__le32 init_size;	/* bytes of init code */
  			__le32 init_data_size;	/* bytes of init data */
  			__le32 boot_size;	/* bytes of bootstrap code */
  			u8 data[0];		/* in same order as sizes */
  		} v1;
  		struct {
  			__le32 build;		/* build number */
  			__le32 inst_size;	/* bytes of runtime code */
  			__le32 data_size;	/* bytes of runtime data */
  			__le32 init_size;	/* bytes of init code */
  			__le32 init_data_size;	/* bytes of init data */
  			__le32 boot_size;	/* bytes of bootstrap code */
  			u8 data[0];		/* in same order as sizes */
  		} v2;
  	} u;
  };
  #define UCODE_HEADER_SIZE(ver) ((ver) == 1 ? 24 : 28)
  
  struct iwl4965_ibss_seq {
  	u8 mac[ETH_ALEN];
  	u16 seq_num;
  	u16 frag_num;
  	unsigned long packet_time;
  	struct list_head list;
  };
  
  struct iwl_sensitivity_ranges {
  	u16 min_nrg_cck;
  	u16 max_nrg_cck;
  
  	u16 nrg_th_cck;
  	u16 nrg_th_ofdm;
  
  	u16 auto_corr_min_ofdm;
  	u16 auto_corr_min_ofdm_mrc;
  	u16 auto_corr_min_ofdm_x1;
  	u16 auto_corr_min_ofdm_mrc_x1;
  
  	u16 auto_corr_max_ofdm;
  	u16 auto_corr_max_ofdm_mrc;
  	u16 auto_corr_max_ofdm_x1;
  	u16 auto_corr_max_ofdm_mrc_x1;
  
  	u16 auto_corr_max_cck;
  	u16 auto_corr_max_cck_mrc;
  	u16 auto_corr_min_cck;
  	u16 auto_corr_min_cck_mrc;
  };
  
  
  #define KELVIN_TO_CELSIUS(x) ((x)-273)
  #define CELSIUS_TO_KELVIN(x) ((x)+273)
  
  
  /**
   * struct iwl_hw_params
   * @max_txq_num: Max # Tx queues supported
   * @dma_chnl_num: Number of Tx DMA/FIFO channels
   * @scd_bc_tbls_size: size of scheduler byte count tables
   * @tfd_size: TFD size
   * @tx/rx_chains_num: Number of TX/RX chains
   * @valid_tx/rx_ant: usable antennas
   * @max_rxq_size: Max # Rx frames in Rx queue (must be power-of-2)
   * @max_rxq_log: Log-base-2 of max_rxq_size
   * @rx_buf_size: Rx buffer size
   * @rx_wrt_ptr_reg: FH{39}_RSCSR_CHNL0_WPTR
   * @max_stations:
   * @bcast_sta_id:
   * @ht40_channel: is 40MHz width possible in band 2.4
   * BIT(IEEE80211_BAND_5GHZ) BIT(IEEE80211_BAND_5GHZ)
   * @sw_crypto: 0 for hw, 1 for sw
   * @max_xxx_size: for ucode uses
   * @ct_kill_threshold: temperature threshold
   * @calib_init_cfg: setup initial calibrations for the hw
   * @struct iwl_sensitivity_ranges: range of sensitivity values
   */
  struct iwl_hw_params {
  	u8 max_txq_num;
  	u8 dma_chnl_num;
  	u16 scd_bc_tbls_size;
  	u32 tfd_size;
  	u8  tx_chains_num;
  	u8  rx_chains_num;
  	u8  valid_tx_ant;
  	u8  valid_rx_ant;
  	u16 max_rxq_size;
  	u16 max_rxq_log;
  	u32 rx_buf_size;
  	u32 rx_wrt_ptr_reg;
  	u32 max_pkt_size;
  	u8  max_stations;
  	u8  bcast_sta_id;
  	u8  ht40_channel;
  	u8  max_beacon_itrvl;	/* in 1024 ms */
  	u32 max_inst_size;
  	u32 max_data_size;
  	u32 max_bsm_size;
  	u32 ct_kill_threshold; /* value in hw-dependent units */
  	u32 ct_kill_exit_threshold; /* value in hw-dependent units */
  				    /* for 1000, 6000 series and up */
  	u32 calib_init_cfg;
  	const struct iwl_sensitivity_ranges *sens;
  };
  
  
  /******************************************************************************
   *
   * Functions implemented in core module which are forward declared here
   * for use by iwl-[4-5].c
   *
   * NOTE:  The implementation of these functions are not hardware specific
   * which is why they are in the core module files.
   *
   * Naming convention --
   * iwl_         <-- Is part of iwlwifi
   * iwlXXXX_     <-- Hardware specific (implemented in iwl-XXXX.c for XXXX)
   * iwl4965_bg_      <-- Called from work queue context
   * iwl4965_mac_     <-- mac80211 callback
   *
   ****************************************************************************/
  extern void iwl_update_chain_flags(struct iwl_priv *priv);
  extern int iwl_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src);
  extern const u8 iwl_bcast_addr[ETH_ALEN];
  extern int iwl_rxq_stop(struct iwl_priv *priv);
  extern void iwl_txq_ctx_stop(struct iwl_priv *priv);
  extern int iwl_queue_space(const struct iwl_queue *q);
  static inline int iwl_queue_used(const struct iwl_queue *q, int i)
  {
  	return q->write_ptr >= q->read_ptr ?
  		(i >= q->read_ptr && i < q->write_ptr) :
  		!(i < q->read_ptr && i >= q->write_ptr);
  }
  
  
  static inline u8 get_cmd_index(struct iwl_queue *q, u32 index, int is_huge)
  {
  	/* This is for scan command, the big buffer at end of command array */
  	if (is_huge)
  		return q->n_window;	/* must be power of 2 */
  
  	/* Otherwise, use normal size buffers */
  	return index & (q->n_window - 1);
  }
  
  
  struct iwl_dma_ptr {
  	dma_addr_t dma;
  	void *addr;
  	size_t size;
  };
  
  #define IWL_CHANNEL_WIDTH_20MHZ   0
  #define IWL_CHANNEL_WIDTH_40MHZ   1
  
  #define IWL_OPERATION_MODE_AUTO     0
  #define IWL_OPERATION_MODE_HT_ONLY  1
  #define IWL_OPERATION_MODE_MIXED    2
  #define IWL_OPERATION_MODE_20MHZ    3
  
  #define IWL_TX_CRC_SIZE 4
  #define IWL_TX_DELIMITER_SIZE 4
  
  #define TX_POWER_IWL_ILLEGAL_VOLTAGE -10000
  
  /* Sensitivity and chain noise calibration */
  #define INITIALIZATION_VALUE		0xFFFF
  #define CAL_NUM_OF_BEACONS		20
  #define MAXIMUM_ALLOWED_PATHLOSS	15
  
  #define CHAIN_NOISE_MAX_DELTA_GAIN_CODE 3
  
  #define MAX_FA_OFDM  50
  #define MIN_FA_OFDM  5
  #define MAX_FA_CCK   50
  #define MIN_FA_CCK   5
  
  #define AUTO_CORR_STEP_OFDM       1
  
  #define AUTO_CORR_STEP_CCK     3
  #define AUTO_CORR_MAX_TH_CCK   160
  
  #define NRG_DIFF               2
  #define NRG_STEP_CCK           2
  #define NRG_MARGIN             8
  #define MAX_NUMBER_CCK_NO_FA 100
  
  #define AUTO_CORR_CCK_MIN_VAL_DEF    (125)
  
  #define CHAIN_A             0
  #define CHAIN_B             1
  #define CHAIN_C             2
  #define CHAIN_NOISE_DELTA_GAIN_INIT_VAL 4
  #define ALL_BAND_FILTER			0xFF00
  #define IN_BAND_FILTER			0xFF
  #define MIN_AVERAGE_NOISE_MAX_VALUE	0xFFFFFFFF
  
  #define NRG_NUM_PREV_STAT_L     20
  #define NUM_RX_CHAINS           3
  
  enum iwl4965_false_alarm_state {
  	IWL_FA_TOO_MANY = 0,
  	IWL_FA_TOO_FEW = 1,
  	IWL_FA_GOOD_RANGE = 2,
  };
  
  enum iwl4965_chain_noise_state {
  	IWL_CHAIN_NOISE_ALIVE = 0,  /* must be 0 */
  	IWL_CHAIN_NOISE_ACCUMULATE,
  	IWL_CHAIN_NOISE_CALIBRATED,
  	IWL_CHAIN_NOISE_DONE,
  };
  
  enum iwl4965_calib_enabled_state {
  	IWL_CALIB_DISABLED = 0,  /* must be 0 */
  	IWL_CALIB_ENABLED = 1,
  };
  
  
  /*
   * enum iwl_calib
   * defines the order in which results of initial calibrations
   * should be sent to the runtime uCode
   */
  enum iwl_calib {
  	IWL_CALIB_XTAL,
  	IWL_CALIB_DC,
  	IWL_CALIB_LO,
  	IWL_CALIB_TX_IQ,
  	IWL_CALIB_TX_IQ_PERD,
  	IWL_CALIB_BASE_BAND,
  	IWL_CALIB_MAX
  };
  
  /* Opaque calibration results */
  struct iwl_calib_result {
  	void *buf;
  	size_t buf_len;
  };
  
  enum ucode_type {
  	UCODE_NONE = 0,
  	UCODE_INIT,
  	UCODE_RT
  };
  
  /* Sensitivity calib data */
  struct iwl_sensitivity_data {
  	u32 auto_corr_ofdm;
  	u32 auto_corr_ofdm_mrc;
  	u32 auto_corr_ofdm_x1;
  	u32 auto_corr_ofdm_mrc_x1;
  	u32 auto_corr_cck;
  	u32 auto_corr_cck_mrc;
  
  	u32 last_bad_plcp_cnt_ofdm;
  	u32 last_fa_cnt_ofdm;
  	u32 last_bad_plcp_cnt_cck;
  	u32 last_fa_cnt_cck;
  
  	u32 nrg_curr_state;
  	u32 nrg_prev_state;
  	u32 nrg_value[10];
  	u8  nrg_silence_rssi[NRG_NUM_PREV_STAT_L];
  	u32 nrg_silence_ref;
  	u32 nrg_energy_idx;
  	u32 nrg_silence_idx;
  	u32 nrg_th_cck;
  	s32 nrg_auto_corr_silence_diff;
  	u32 num_in_cck_no_fa;
  	u32 nrg_th_ofdm;
  };
  
  /* Chain noise (differential Rx gain) calib data */
  struct iwl_chain_noise_data {
  	u32 active_chains;
  	u32 chain_noise_a;
  	u32 chain_noise_b;
  	u32 chain_noise_c;
  	u32 chain_signal_a;
  	u32 chain_signal_b;
  	u32 chain_signal_c;
  	u16 beacon_count;
  	u8 disconn_array[NUM_RX_CHAINS];
  	u8 delta_gain_code[NUM_RX_CHAINS];
  	u8 radio_write;
  	u8 state;
  };
  
  #define	EEPROM_SEM_TIMEOUT 10		/* milliseconds */
  #define EEPROM_SEM_RETRY_LIMIT 1000	/* number of attempts (not time) */
  
  #define IWL_TRAFFIC_ENTRIES	(256)
  #define IWL_TRAFFIC_ENTRY_SIZE  (64)
  
  enum {
  	MEASUREMENT_READY = (1 << 0),
  	MEASUREMENT_ACTIVE = (1 << 1),
  };
  
  enum iwl_nvm_type {
  	NVM_DEVICE_TYPE_EEPROM = 0,
  	NVM_DEVICE_TYPE_OTP,
  };
  
  /*
   * Two types of OTP memory access modes
   *   IWL_OTP_ACCESS_ABSOLUTE - absolute address mode,
   * 			        based on physical memory addressing
   *   IWL_OTP_ACCESS_RELATIVE - relative address mode,
   * 			       based on logical memory addressing
   */
  enum iwl_access_mode {
  	IWL_OTP_ACCESS_ABSOLUTE,
  	IWL_OTP_ACCESS_RELATIVE,
  };
  
  /**
   * enum iwl_pa_type - Power Amplifier type
   * @IWL_PA_SYSTEM:  based on uCode configuration
   * @IWL_PA_HYBRID: use both Internal and external PA
   * @IWL_PA_INTERNAL: use Internal only
   */
  enum iwl_pa_type {
  	IWL_PA_SYSTEM = 0,
  	IWL_PA_HYBRID = 1,
  	IWL_PA_INTERNAL = 2,
  };
  
  /* interrupt statistics */
  struct isr_statistics {
  	u32 hw;
  	u32 sw;
  	u32 sw_err;
  	u32 sch;
  	u32 alive;
  	u32 rfkill;
  	u32 ctkill;
  	u32 wakeup;
  	u32 rx;
  	u32 rx_handlers[REPLY_MAX];
  	u32 tx;
  	u32 unhandled;
  };
  
  #ifdef CONFIG_IWLWIFI_DEBUGFS
  /* management statistics */
  enum iwl_mgmt_stats {
  	MANAGEMENT_ASSOC_REQ = 0,
  	MANAGEMENT_ASSOC_RESP,
  	MANAGEMENT_REASSOC_REQ,
  	MANAGEMENT_REASSOC_RESP,
  	MANAGEMENT_PROBE_REQ,
  	MANAGEMENT_PROBE_RESP,
  	MANAGEMENT_BEACON,
  	MANAGEMENT_ATIM,
  	MANAGEMENT_DISASSOC,
  	MANAGEMENT_AUTH,
  	MANAGEMENT_DEAUTH,
  	MANAGEMENT_ACTION,
  	MANAGEMENT_MAX,
  };
  /* control statistics */
  enum iwl_ctrl_stats {
  	CONTROL_BACK_REQ =  0,
  	CONTROL_BACK,
  	CONTROL_PSPOLL,
  	CONTROL_RTS,
  	CONTROL_CTS,
  	CONTROL_ACK,
  	CONTROL_CFEND,
  	CONTROL_CFENDACK,
  	CONTROL_MAX,
  };
  
  struct traffic_stats {
  	u32 mgmt[MANAGEMENT_MAX];
  	u32 ctrl[CONTROL_MAX];
  	u32 data_cnt;
  	u64 data_bytes;
  };
  #else
  struct traffic_stats {
  	u64 data_bytes;
  };
  #endif
  
  #define IWL_MAX_NUM_QUEUES	20 /* FIXME: do dynamic allocation */
  
  struct iwl_priv {
  
  	/* ieee device used by generic ieee processing code */
  	struct ieee80211_hw *hw;
  	struct ieee80211_channel *ieee_channels;
  	struct ieee80211_rate *ieee_rates;
  	struct iwl_cfg *cfg;
  
  	/* temporary frame storage list */
  	struct list_head free_frames;
  	int frames_count;
  
  	enum ieee80211_band band;
  	int alloc_rxb_skb;
  
  	void (*rx_handlers[REPLY_MAX])(struct iwl_priv *priv,
  				       struct iwl_rx_mem_buffer *rxb);
  
  	struct ieee80211_supported_band bands[IEEE80211_NUM_BANDS];
  
  #if defined(CONFIG_IWLWIFI_SPECTRUM_MEASUREMENT) || defined(CONFIG_IWL3945_SPECTRUM_MEASUREMENT)
  	/* spectrum measurement report caching */
  	struct iwl_spectrum_notification measure_report;
  	u8 measurement_status;
  #endif
  	/* ucode beacon time */
  	u32 ucode_beacon_time;
  
  	/* we allocate array of iwl4965_channel_info for NIC's valid channels.
  	 *    Access via channel # using indirect index array */
  	struct iwl_channel_info *channel_info;	/* channel info array */
  	u8 channel_count;	/* # of channels */
  
  	/* each calibration channel group in the EEPROM has a derived
  	 * clip setting for each rate. 3945 only.*/
  	const struct iwl3945_clip_group clip39_groups[5];
  
  	/* thermal calibration */
  	s32 temperature;	/* degrees Kelvin */
  	s32 last_temperature;
  
  	/* init calibration results */
  	struct iwl_calib_result calib_results[IWL_CALIB_MAX];
  
  	/* Scan related variables */
  	unsigned long last_scan_jiffies;
  	unsigned long next_scan_jiffies;
  	unsigned long scan_start;
  	unsigned long scan_pass_start;
  	unsigned long scan_start_tsf;
  	void *scan;
  	int scan_bands;
  	struct cfg80211_scan_request *scan_request;
  	u8 scan_tx_ant[IEEE80211_NUM_BANDS];
  	u8 mgmt_tx_ant;
  
  	/* spinlock */
  	spinlock_t lock;	/* protect general shared data */
  	spinlock_t hcmd_lock;	/* protect hcmd */
  	spinlock_t reg_lock;	/* protect hw register access */
  	struct mutex mutex;
  
  	/* basic pci-network driver stuff */
  	struct pci_dev *pci_dev;
  
  	/* pci hardware address support */
  	void __iomem *hw_base;
  	u32  hw_rev;
  	u32  hw_wa_rev;
  	u8   rev_id;
  
  	/* uCode images, save to reload in case of failure */
  	u32 ucode_ver;			/* version of ucode, copy of
  					   iwl_ucode.ver */
  	struct fw_desc ucode_code;	/* runtime inst */
  	struct fw_desc ucode_data;	/* runtime data original */
  	struct fw_desc ucode_data_backup;	/* runtime data save/restore */
  	struct fw_desc ucode_init;	/* initialization inst */
  	struct fw_desc ucode_init_data;	/* initialization data */
  	struct fw_desc ucode_boot;	/* bootstrap inst */
  	enum ucode_type ucode_type;
  	u8 ucode_write_complete;	/* the image write is complete */
  
  
  	struct iwl_rxon_time_cmd rxon_timing;
  
  	/* We declare this const so it can only be
  	 * changed via explicit cast within the
  	 * routines that actually update the physical
  	 * hardware */
  	const struct iwl_rxon_cmd active_rxon;
  	struct iwl_rxon_cmd staging_rxon;
  
  	struct iwl_rxon_cmd recovery_rxon;
  
  	/* 1st responses from initialize and runtime uCode images.
  	 * 4965's initialize alive response contains some calibration data. */
  	struct iwl_init_alive_resp card_alive_init;
  	struct iwl_alive_resp card_alive;
  
  #ifdef CONFIG_IWLWIFI_LEDS
  	unsigned long last_blink_time;
  	u8 last_blink_rate;
  	u8 allow_blinking;
  	u64 led_tpt;
  	struct iwl_led led[IWL_LED_TRG_MAX];
  	unsigned int rxtxpackets;
  #endif
  	u16 active_rate;
  	u16 active_rate_basic;
  
  	u8 assoc_station_added;
  	u8 start_calib;
  	struct iwl_sensitivity_data sensitivity_data;
  	struct iwl_chain_noise_data chain_noise_data;
  	__le16 sensitivity_tbl[HD_TABLE_SIZE];
  
  	struct iwl_ht_info current_ht_config;
  	u8 last_phy_res[100];
  
  	/* Rate scaling data */
  	s8 data_retry_limit;
  	u8 retry_rate;
  
  	wait_queue_head_t wait_command_queue;
  
  	int activity_timer_active;
  
  	/* Rx and Tx DMA processing queues */
  	struct iwl_rx_queue rxq;
  	struct iwl_tx_queue txq[IWL_MAX_NUM_QUEUES];
  	unsigned long txq_ctx_active_msk;
  	struct iwl_dma_ptr  kw;	/* keep warm address */
  	struct iwl_dma_ptr  scd_bc_tbls;
  
  	u32 scd_base_addr;	/* scheduler sram base address */
  
  	unsigned long status;
  
  	int last_rx_rssi;	/* From Rx packet statistics */
  	int last_rx_noise;	/* From beacon statistics */
  
  	/* counts mgmt, ctl, and data packets */
  	struct traffic_stats tx_stats;
  	struct traffic_stats rx_stats;
  
  	/* counts interrupts */
  	struct isr_statistics isr_stats;
  
  	struct iwl_power_mgr power_data;
  	struct iwl_tt_mgmt thermal_throttle;
  
  	struct iwl_notif_statistics statistics;
  	unsigned long last_statistics_time;
  
  	/* context information */
  	u16 rates_mask;
  
  	u8 bssid[ETH_ALEN];
  	u16 rts_threshold;
  	u8 mac_addr[ETH_ALEN];
  
  	/*station table variables */
  	spinlock_t sta_lock;
  	int num_stations;
  	struct iwl_station_entry stations[IWL_STATION_COUNT];
  	struct iwl_wep_key wep_keys[WEP_KEYS_MAX];
  	u8 default_wep_key;
  	u8 key_mapping_key;
  	unsigned long ucode_key_table;
  
  	/* queue refcounts */
  #define IWL_MAX_HW_QUEUES	32
  	unsigned long queue_stopped[BITS_TO_LONGS(IWL_MAX_HW_QUEUES)];
  	/* for each AC */
  	atomic_t queue_stop_count[4];
  
  	/* Indication if ieee80211_ops->open has been called */
  	u8 is_open;
  
  	u8 mac80211_registered;
  
  	/* Rx'd packet timing information */
  	u32 last_beacon_time;
  	u64 last_tsf;
  
  	/* eeprom -- this is in the card's little endian byte order */
  	u8 *eeprom;
  	int    nvm_device_type;
  	struct iwl_eeprom_calib_info *calib_info;
  
  	enum nl80211_iftype iw_mode;
  
  	struct sk_buff *ibss_beacon;
  
  	/* Last Rx'd beacon timestamp */
  	u64 timestamp;
  	u16 beacon_int;
  	struct ieee80211_vif *vif;
  
  	/*Added for 3945 */
  	void *shared_virt;
  	dma_addr_t shared_phys;
  	/*End*/
  	struct iwl_hw_params hw_params;
  
  	/* INT ICT Table */
  	__le32 *ict_tbl;
  	dma_addr_t ict_tbl_dma;
  	dma_addr_t aligned_ict_tbl_dma;
  	int ict_index;
  	void *ict_tbl_vir;
  	u32 inta;
  	bool use_ict;
  
  	u32 inta_mask;
  	/* Current association information needed to configure the
  	 * hardware */
  	u16 assoc_id;
  	u16 assoc_capability;
  
  	struct iwl_qos_info qos_data;
  
  	struct workqueue_struct *workqueue;
  
  	struct work_struct up;
  	struct work_struct restart;
  	struct work_struct calibrated_work;
  	struct work_struct scan_completed;
  	struct work_struct rx_replenish;
  	struct work_struct abort_scan;
  	struct work_struct update_link_led;
  	struct work_struct auth_work;
  	struct work_struct report_work;
  	struct work_struct request_scan;
  	struct work_struct beacon_update;
  	struct work_struct tt_work;
  	struct work_struct ct_enter;
  	struct work_struct ct_exit;
  
  	struct tasklet_struct irq_tasklet;
  
  	struct delayed_work init_alive_start;
  	struct delayed_work alive_start;
  	struct delayed_work scan_check;
  
  	/*For 3945 only*/
  	struct delayed_work thermal_periodic;
  	struct delayed_work rfkill_poll;
  
  	/* TX Power */
  	s8 tx_power_user_lmt;
  	s8 tx_power_device_lmt;
  
  
  #ifdef CONFIG_IWLWIFI_DEBUG
  	/* debugging info */
  	u32 debug_level; /* per device debugging will override global
  			    iwl_debug_level if set */
  	u32 framecnt_to_us;
  	atomic_t restrict_refcnt;
  	bool disable_ht40;
  #ifdef CONFIG_IWLWIFI_DEBUGFS
  	/* debugfs */
  	u16 tx_traffic_idx;
  	u16 rx_traffic_idx;
  	u8 *tx_traffic;
  	u8 *rx_traffic;
  	struct iwl_debugfs *dbgfs;
  #endif /* CONFIG_IWLWIFI_DEBUGFS */
  #endif /* CONFIG_IWLWIFI_DEBUG */
  
  	struct work_struct txpower_work;
  	u32 disable_sens_cal;
  	u32 disable_chain_noise_cal;
  	u32 disable_tx_power_cal;
  	struct work_struct run_time_calib_work;
  	struct timer_list statistics_periodic;
  	bool hw_ready;
  	/*For 3945*/
  #define IWL_DEFAULT_TX_POWER 0x0F
  
  	struct iwl3945_notif_statistics statistics_39;
  
  	u32 sta_supp_rates;
  }; /*iwl_priv */
  
  static inline void iwl_txq_ctx_activate(struct iwl_priv *priv, int txq_id)
  {
  	set_bit(txq_id, &priv->txq_ctx_active_msk);
  }
  
  static inline void iwl_txq_ctx_deactivate(struct iwl_priv *priv, int txq_id)
  {
  	clear_bit(txq_id, &priv->txq_ctx_active_msk);
  }
  
  #ifdef CONFIG_IWLWIFI_DEBUG
  const char *iwl_get_tx_fail_reason(u32 status);
  /*
   * iwl_get_debug_level: Return active debug level for device
   *
   * Using sysfs it is possible to set per device debug level. This debug
   * level will be used if set, otherwise the global debug level which can be
   * set via module parameter is used.
   */
  static inline u32 iwl_get_debug_level(struct iwl_priv *priv)
  {
  	if (priv->debug_level)
  		return priv->debug_level;
  	else
  		return iwl_debug_level;
  }
  #else
  static inline const char *iwl_get_tx_fail_reason(u32 status) { return ""; }
  
  static inline u32 iwl_get_debug_level(struct iwl_priv *priv)
  {
  	return iwl_debug_level;
  }
  #endif
  
  
  static inline struct ieee80211_hdr *iwl_tx_queue_get_hdr(struct iwl_priv *priv,
  							 int txq_id, int idx)
  {
  	if (priv->txq[txq_id].txb[idx].skb[0])
  		return (struct ieee80211_hdr *)priv->txq[txq_id].
  				txb[idx].skb[0]->data;
  	return NULL;
  }
  
  
  static inline int iwl_is_associated(struct iwl_priv *priv)
  {
  	return (priv->active_rxon.filter_flags & RXON_FILTER_ASSOC_MSK) ? 1 : 0;
  }
  
  static inline int is_channel_valid(const struct iwl_channel_info *ch_info)
  {
  	if (ch_info == NULL)
  		return 0;
  	return (ch_info->flags & EEPROM_CHANNEL_VALID) ? 1 : 0;
  }
  
  static inline int is_channel_radar(const struct iwl_channel_info *ch_info)
  {
  	return (ch_info->flags & EEPROM_CHANNEL_RADAR) ? 1 : 0;
  }
  
  static inline u8 is_channel_a_band(const struct iwl_channel_info *ch_info)
  {
  	return ch_info->band == IEEE80211_BAND_5GHZ;
  }
  
  static inline u8 is_channel_bg_band(const struct iwl_channel_info *ch_info)
  {
  	return ch_info->band == IEEE80211_BAND_2GHZ;
  }
  
  static inline int is_channel_passive(const struct iwl_channel_info *ch)
  {
  	return (!(ch->flags & EEPROM_CHANNEL_ACTIVE)) ? 1 : 0;
  }
  
  static inline int is_channel_ibss(const struct iwl_channel_info *ch)
  {
  	return ((ch->flags & EEPROM_CHANNEL_IBSS)) ? 1 : 0;
  }
  
  #endif				/* __iwl_dev_h__ */
  