path: root/drivers/net/wireless/iwlwifi/iwl-agn-calib.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 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.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

#include <linux/slab.h>
#include <net/mac80211.h>

#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-agn-calib.h"
#include "iwl-trans.h"
#include "iwl-agn.h"

/*****************************************************************************
 * INIT calibrations framework
 *****************************************************************************/

struct statistics_general_data {
	u32 beacon_silence_rssi_a;
	u32 beacon_silence_rssi_b;
	u32 beacon_silence_rssi_c;
	u32 beacon_energy_a;
	u32 beacon_energy_b;
	u32 beacon_energy_c;
};

int iwl_send_calib_results(struct iwl_priv *priv)
{
	int ret = 0;
	int i = 0;

	struct iwl_host_cmd hcmd = {
		.id = REPLY_PHY_CALIBRATION_CMD,
		.flags = CMD_SYNC,
	};

	for (i = 0; i < IWL_CALIB_MAX; i++) {
		if ((BIT(i) & hw_params(priv).calib_init_cfg) &&
		    priv->calib_results[i].buf) {
			hcmd.len[0] = priv->calib_results[i].buf_len;
			hcmd.data[0] = priv->calib_results[i].buf;
			hcmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
			ret = iwl_trans_send_cmd(trans(priv), &hcmd);
			if (ret) {
				IWL_ERR(priv, "Error %d iteration %d\n",
					ret, i);
				break;
			}
		}
	}

	return ret;
}

int iwl_calib_set(struct iwl_calib_result *res, const u8 *buf, int len)
{
	if (res->buf_len != len) {
		kfree(res->buf);
		res->buf = kzalloc(len, GFP_ATOMIC);
	}
	if (unlikely(res->buf == NULL))
		return -ENOMEM;

	res->buf_len = len;
	memcpy(res->buf, buf, len);
	return 0;
}

void iwl_calib_free_results(struct iwl_priv *priv)
{
	int i;

	for (i = 0; i < IWL_CALIB_MAX; i++) {
		kfree(priv->calib_results[i].buf);
		priv->calib_results[i].buf = NULL;
		priv->calib_results[i].buf_len = 0;
	}
}

/*****************************************************************************
 * RUNTIME calibrations framework
 *****************************************************************************/

/* "false alarms" are signals that our DSP tries to lock onto,
 *   but then determines that they are either noise, or transmissions
 *   from a distant wireless network (also "noise", really) that get
 *   "stepped on" by stronger transmissions within our own network.
 * This algorithm attempts to set a sensitivity level that is high
 *   enough to receive all of our own network traffic, but not so
 *   high that our DSP gets too busy trying to lock onto non-network
 *   activity/noise. */
static int iwl_sens_energy_cck(struct iwl_priv *priv,
				   u32 norm_fa,
				   u32 rx_enable_time,
				   struct statistics_general_data *rx_info)
{
	u32 max_nrg_cck = 0;
	int i = 0;
	u8 max_silence_rssi = 0;
	u32 silence_ref = 0;
	u8