linux/drivers/net/wireless/intel/iwlwifi/dvm/calib.c

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2005-2014 Intel Corporation
 */
#include <linux/slab.h>
#include <net/mac80211.h>

#include "iwl-trans.h"

#include "dev.h"
#include "calib.h"
#include "agn.h"

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

/* Opaque calibration results */
struct iwl_calib_result { … };

struct statistics_general_data { … };

int iwl_send_calib_results(struct iwl_priv *priv)
{ … }

int iwl_calib_set(struct iwl_priv *priv,
		  const struct iwl_calib_cmd *cmd, size_t len)
{ … }

void iwl_calib_free_results(struct iwl_priv *priv)
{ … }

/*****************************************************************************
 * 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)
{ … }


static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
				       u32 norm_fa,
				       u32 rx_enable_time)
{ … }

static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
				struct iwl_sensitivity_data *data,
				__le16 *tbl)
{ … }

/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
static int iwl_sensitivity_write(struct iwl_priv *priv)
{ … }

/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
static int iwl_enhance_sensitivity_write(struct iwl_priv *priv)
{ … }

void iwl_init_sensitivity(struct iwl_priv *priv)
{ … }

void iwl_sensitivity_calibration(struct iwl_priv *priv)
{ … }

static inline u8 find_first_chain(u8 mask)
{ … }

/*
 * Run disconnected antenna algorithm to find out which antennas are
 * disconnected.
 */
static void iwl_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
				     struct iwl_chain_noise_data *data)
{ … }

static void iwlagn_gain_computation(struct iwl_priv *priv,
				    u32 average_noise[NUM_RX_CHAINS],
				    u8 default_chain)
{ … }

/*
 * Accumulate 16 beacons of signal and noise statistics for each of
 *   3 receivers/antennas/rx-chains, then figure out:
 * 1)  Which antennas are connected.
 * 2)  Differential rx gain settings to balance the 3 receivers.
 */
void iwl_chain_noise_calibration(struct iwl_priv *priv)
{ … }

void iwl_reset_run_time_calib(struct iwl_priv *priv)
{ … }