/******************************************************************************
 *
 * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * 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
 *
 *****************************************************************************/
#ifndef __iwl_sta_h__
#define __iwl_sta_h__

#include "iwl-dev.h"

#define IWL_STA_DRIVER_ACTIVE BIT(0) /* driver entry is active */
#define IWL_STA_UCODE_ACTIVE  BIT(1) /* ucode entry is active */
#define IWL_STA_UCODE_INPROGRESS  BIT(2) /* ucode entry is in process of
					    being activated */
#define IWL_STA_LOCAL BIT(3) /* station state not directed by mac80211;
				(this is for the IBSS BSSID stations) */
#define IWL_STA_BCAST BIT(4) /* this station is the special bcast station */


void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx);
void iwl_clear_ucode_stations(struct iwl_priv *priv,
			      struct iwl_rxon_context *ctx);
void iwl_dealloc_bcast_stations(struct iwl_priv *priv);
int iwl_get_free_ucode_key_offset(struct iwl_priv *priv);
int iwl_send_add_sta(struct iwl_priv *priv,
		     struct iwl_addsta_cmd *sta, u8 flags);
int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
			   const u8 *addr, bool is_ap,
			   struct ieee80211_sta *sta, u8 *sta_id_r);
int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
		       const u8 *addr);
int iwlagn_mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
		       struct ieee80211_sta *sta);

u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
		    const u8 *addr, bool is_ap, struct ieee80211_sta *sta);

void iwl_sta_fill_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
		     u8 sta_id, struct iwl_link_quality_cmd *link_cmd);
int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
		    struct iwl_link_quality_cmd *lq, u8 flags, bool init);
void iwl_reprogram_ap_sta(struct iwl_priv *priv, struct iwl_rxon_context *ctx);
int iwl_add_sta_callback(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
			       struct iwl_device_cmd *cmd);


/**
 * iwl_clear_driver_stations - clear knowledge of all stations from driver
 * @priv: iwl priv struct
 *
 * This is called during iwl_down() to make sure that in the case
 * we're coming there from a hardware restart mac80211 will be
 * able to reconfigure stations -- if we're getting there in the
 * normal down flow then the stations will already be cleared.
 */
static inline void iwl_clear_driver_stations(struct iwl_priv *priv)
{
	unsigned long flags;
	struct iwl_rxon_context *ctx;

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	memset(priv->stations, 0, sizeof(priv->stations));
	priv->num_stations = 0;

	priv->ucode_key_table = 0;

	for_each_context(priv, ctx) {
		/*
		 * Remove all key information that is not stored as part
		 * of station information since mac80211 may not have had
		 * a chance to remove all the keys. When device is
		 * reconfigured by mac80211 after an error all keys will
		 * be reconfigured.
		 */
		memset(ctx->wep_keys, 0, sizeof(ctx->wep_keys));
		ctx->key_mapping_keys = 0;
	}

	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
}

static inline int iwl_sta_id(struct ieee80211_sta *sta)
{
	if (WARN_ON(!sta))
		return IWL_INVALID_STATION;

	return ((struct iwl_station_priv *)sta->drv_priv)->sta_id;
}

/**
 * iwl_sta_id_or_broadcast - return sta_id or broadcast sta
 * @priv: iwl priv
 * @context: the current context
 * @sta: mac80211 station
 *
 * In certain circumstances mac80211 passes a station pointer
 * that may be %NULL, for example during TX or key setup. In
 * that case, we need to use the broadcast station, so this
 * inline wraps that pattern.
 */
static inline int iwl_sta_id_or_broadcast(struct iwl_priv *priv,
					  struct iwl_rxon_context *context,
					  struct ieee80211_sta *sta)
{
	int sta_id;

	if (!sta)
		return context->bcast_sta_id;

	sta_id = iwl_sta_id(sta);

	/*
	 * mac80211 should not be passing a partially
	 * initialised station!
	 */
	WARN_ON(sta_id == IWL_INVALID_STATION);

	return sta_id;
}
#endif /* __iwl_sta_h__ */