drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c - LeafOS-Devices/android_kernel_realme_mt6785 - Gitiles

 /******************************************************************************
  *
  * GPL LICENSE SUMMARY
  *
  * Copyright(c) 2008 - 2010 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
  *
  *****************************************************************************/

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/sched.h>

 #include "iwl-dev.h"
 #include "iwl-core.h"
 #include "iwl-io.h"
 #include "iwl-agn.h"

 static int iwlagn_send_rxon_assoc(struct iwl_priv *priv)
 {
 	int ret = 0;
 	struct iwl5000_rxon_assoc_cmd rxon_assoc;
 	const struct iwl_rxon_cmd *rxon1 = &priv->staging_rxon;
 	const struct iwl_rxon_cmd *rxon2 = &priv->active_rxon;

 	if ((rxon1->flags == rxon2->flags) &&
 	    (rxon1->filter_flags == rxon2->filter_flags) &&
 	    (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
 	    (rxon1->ofdm_ht_single_stream_basic_rates ==
 	     rxon2->ofdm_ht_single_stream_basic_rates) &&
 	    (rxon1->ofdm_ht_dual_stream_basic_rates ==
 	     rxon2->ofdm_ht_dual_stream_basic_rates) &&
 	    (rxon1->ofdm_ht_triple_stream_basic_rates ==
 	     rxon2->ofdm_ht_triple_stream_basic_rates) &&
 	    (rxon1->acquisition_data == rxon2->acquisition_data) &&
 	    (rxon1->rx_chain == rxon2->rx_chain) &&
 	    (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
 		IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
 		return 0;
 	}

 	rxon_assoc.flags = priv->staging_rxon.flags;
 	rxon_assoc.filter_flags = priv->staging_rxon.filter_flags;
 	rxon_assoc.ofdm_basic_rates = priv->staging_rxon.ofdm_basic_rates;
 	rxon_assoc.cck_basic_rates = priv->staging_rxon.cck_basic_rates;
 	rxon_assoc.reserved1 = 0;
 	rxon_assoc.reserved2 = 0;
 	rxon_assoc.reserved3 = 0;
 	rxon_assoc.ofdm_ht_single_stream_basic_rates =
 	    priv->staging_rxon.ofdm_ht_single_stream_basic_rates;
 	rxon_assoc.ofdm_ht_dual_stream_basic_rates =
 	    priv->staging_rxon.ofdm_ht_dual_stream_basic_rates;
 	rxon_assoc.rx_chain_select_flags = priv->staging_rxon.rx_chain;
 	rxon_assoc.ofdm_ht_triple_stream_basic_rates =
 		 priv->staging_rxon.ofdm_ht_triple_stream_basic_rates;
 	rxon_assoc.acquisition_data = priv->staging_rxon.acquisition_data;

 	ret = iwl_send_cmd_pdu_async(priv, REPLY_RXON_ASSOC,
 				     sizeof(rxon_assoc), &rxon_assoc, NULL);
 	if (ret)
 		return ret;

 	return ret;
 }

 static int iwlagn_send_tx_ant_config(struct iwl_priv *priv, u8 valid_tx_ant)
 {
 	struct iwl_tx_ant_config_cmd tx_ant_cmd = {
 	  .valid = cpu_to_le32(valid_tx_ant),
 	};

 	if (IWL_UCODE_API(priv->ucode_ver) > 1) {
 		IWL_DEBUG_HC(priv, "select valid tx ant: %u\n", valid_tx_ant);
 		return iwl_send_cmd_pdu(priv, TX_ANT_CONFIGURATION_CMD,
 					sizeof(struct iwl_tx_ant_config_cmd),
 					&tx_ant_cmd);
 	} else {
 		IWL_DEBUG_HC(priv, "TX_ANT_CONFIGURATION_CMD not supported\n");
 		return -EOPNOTSUPP;
 	}
 }

 /* Currently this is the superset of everything */
 static u16 iwlagn_get_hcmd_size(u8 cmd_id, u16 len)
 {
 	return len;
 }

 static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 {
 	u16 size = (u16)sizeof(struct iwl_addsta_cmd);
 	struct iwl_addsta_cmd *addsta = (struct iwl_addsta_cmd *)data;
 	memcpy(addsta, cmd, size);
 	/* resrved in 5000 */
 	addsta->rate_n_flags = cpu_to_le16(0);
 	return size;
 }

 static void iwlagn_gain_computation(struct iwl_priv *priv,
 		u32 average_noise[NUM_RX_CHAINS],
 		u16 min_average_noise_antenna_i,
 		u32 min_average_noise,
 		u8 default_chain)
 {
 	int i;
 	s32 delta_g;
 	struct iwl_chain_noise_data *data = &priv->chain_noise_data;

 	/*
 	 * Find Gain Code for the chains based on "default chain"
 	 */
 	for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {
 		if ((data->disconn_array[i])) {
 			data->delta_gain_code[i] = 0;
 			continue;
 		}

 		delta_g = (priv->cfg->chain_noise_scale *
 			((s32)average_noise[default_chain] -
 			(s32)average_noise[i])) / 1500;

 		/* bound gain by 2 bits value max, 3rd bit is sign */
 		data->delta_gain_code[i] =
 			min(abs(delta_g), (long) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);

 		if (delta_g < 0)
 			/*
 			 * set negative sign ...
 			 * note to Intel developers:  This is uCode API format,
 			 *   not the format of any internal device registers.
 			 *   Do not change this format for e.g. 6050 or similar
 			 *   devices.  Change format only if more resolution
 			 *   (i.e. more than 2 bits magnitude) is needed.
 			 */
 			data->delta_gain_code[i] |= (1 << 2);
 	}

 	IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d  ANT_C = %d\n",
 			data->delta_gain_code[1], data->delta_gain_code[2]);

 	if (!data->radio_write) {
 		struct iwl_calib_chain_noise_gain_cmd cmd;

 		memset(&cmd, 0, sizeof(cmd));

 		cmd.hdr.op_code = IWL_PHY_CALIBRATE_CHAIN_NOISE_GAIN_CMD;
 		cmd.hdr.first_group = 0;
 		cmd.hdr.groups_num = 1;
 		cmd.hdr.data_valid = 1;
 		cmd.delta_gain_1 = data->delta_gain_code[1];
 		cmd.delta_gain_2 = data->delta_gain_code[2];
 		iwl_send_cmd_pdu_async(priv, REPLY_PHY_CALIBRATION_CMD,
 			sizeof(cmd), &cmd, NULL);

 		data->radio_write = 1;
 		data->state = IWL_CHAIN_NOISE_CALIBRATED;
 	}

 	data->chain_noise_a = 0;
 	data->chain_noise_b = 0;
 	data->chain_noise_c = 0;
 	data->chain_signal_a = 0;
 	data->chain_signal_b = 0;
 	data->chain_signal_c = 0;
 	data->beacon_count = 0;
 }

 static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
 {
 	struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 	int ret;

 	if ((data->state == IWL_CHAIN_NOISE_ALIVE) && iwl_is_associated(priv)) {
 		struct iwl_calib_chain_noise_reset_cmd cmd;
 		memset(&cmd, 0, sizeof(cmd));

 		cmd.hdr.op_code = IWL_PHY_CALIBRATE_CHAIN_NOISE_RESET_CMD;
 		cmd.hdr.first_group = 0;
 		cmd.hdr.groups_num = 1;
 		cmd.hdr.data_valid = 1;
 		ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
 					sizeof(cmd), &cmd);
 		if (ret)
 			IWL_ERR(priv,
 				"Could not send REPLY_PHY_CALIBRATION_CMD\n");
 		data->state = IWL_CHAIN_NOISE_ACCUMULATE;
 		IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
 	}
 }

 static void iwlagn_rts_tx_cmd_flag(struct ieee80211_tx_info *info,
 			__le32 *tx_flags)
 {
 	if ((info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 	    (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 		*tx_flags |= TX_CMD_FLG_RTS_CTS_MSK;
 	else
 		*tx_flags &= ~TX_CMD_FLG_RTS_CTS_MSK;
 }

 /* Calc max signal level (dBm) among 3 possible receivers */
 static int iwlagn_calc_rssi(struct iwl_priv *priv,
 			     struct iwl_rx_phy_res *rx_resp)
 {
 	/* data from PHY/DSP regarding signal strength, etc.,
 	 *   contents are always there, not configurable by host
 	 */
 	struct iwl5000_non_cfg_phy *ncphy =
 		(struct iwl5000_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
 	u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
 	u8 agc;

 	val  = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_AGC_IDX]);
 	agc = (val & IWL50_OFDM_AGC_MSK) >> IWL50_OFDM_AGC_BIT_POS;

 	/* Find max rssi among 3 possible receivers.
 	 * These values are measured by the digital signal processor (DSP).
 	 * They should stay fairly constant even as the signal strength varies,
 	 *   if the radio's automatic gain control (AGC) is working right.
 	 * AGC value (see below) will provide the "interesting" info.
 	 */
 	val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_RSSI_AB_IDX]);
 	rssi_a = (val & IWL50_OFDM_RSSI_A_MSK) >> IWL50_OFDM_RSSI_A_BIT_POS;
 	rssi_b = (val & IWL50_OFDM_RSSI_B_MSK) >> IWL50_OFDM_RSSI_B_BIT_POS;
 	val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_RSSI_C_IDX]);
 	rssi_c = (val & IWL50_OFDM_RSSI_C_MSK) >> IWL50_OFDM_RSSI_C_BIT_POS;

 	max_rssi = max_t(u32, rssi_a, rssi_b);
 	max_rssi = max_t(u32, max_rssi, rssi_c);

 	IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
 		rssi_a, rssi_b, rssi_c, max_rssi, agc);

 	/* dBm = max_rssi dB - agc dB - constant.
 	 * Higher AGC (higher radio gain) means lower signal. */
 	return max_rssi - agc - IWLAGN_RSSI_OFFSET;
 }

 struct iwl_hcmd_ops iwlagn_hcmd = {
 	.rxon_assoc = iwlagn_send_rxon_assoc,
 	.commit_rxon = iwl_commit_rxon,
 	.set_rxon_chain = iwl_set_rxon_chain,
 	.set_tx_ant = iwlagn_send_tx_ant_config,
 	.send_bt_config = iwl_send_bt_config,
 };

 struct iwl_hcmd_utils_ops iwlagn_hcmd_utils = {
 	.get_hcmd_size = iwlagn_get_hcmd_size,
 	.build_addsta_hcmd = iwlagn_build_addsta_hcmd,
 	.gain_computation = iwlagn_gain_computation,
 	.chain_noise_reset = iwlagn_chain_noise_reset,
 	.rts_tx_cmd_flag = iwlagn_rts_tx_cmd_flag,
 	.calc_rssi = iwlagn_calc_rssi,
 	.request_scan = iwlagn_request_scan,
 };
	/******************************************************************************
	*
	* GPL LICENSE SUMMARY
	*
	* Copyright(c) 2008 - 2010 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
	*
	*****************************************************************************/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/sched.h>

	#include "iwl-dev.h"
	#include "iwl-core.h"
	#include "iwl-io.h"
	#include "iwl-agn.h"

	static int iwlagn_send_rxon_assoc(struct iwl_priv *priv)
	{
	int ret = 0;
	struct iwl5000_rxon_assoc_cmd rxon_assoc;
	const struct iwl_rxon_cmd *rxon1 = &priv->staging_rxon;
	const struct iwl_rxon_cmd *rxon2 = &priv->active_rxon;

	if ((rxon1->flags == rxon2->flags) &&
	(rxon1->filter_flags == rxon2->filter_flags) &&
	(rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
	(rxon1->ofdm_ht_single_stream_basic_rates ==
	rxon2->ofdm_ht_single_stream_basic_rates) &&
	(rxon1->ofdm_ht_dual_stream_basic_rates ==
	rxon2->ofdm_ht_dual_stream_basic_rates) &&
	(rxon1->ofdm_ht_triple_stream_basic_rates ==
	rxon2->ofdm_ht_triple_stream_basic_rates) &&
	(rxon1->acquisition_data == rxon2->acquisition_data) &&
	(rxon1->rx_chain == rxon2->rx_chain) &&
	(rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
	IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC. Not resending.\n");
	return 0;
	}

	rxon_assoc.flags = priv->staging_rxon.flags;
	rxon_assoc.filter_flags = priv->staging_rxon.filter_flags;
	rxon_assoc.ofdm_basic_rates = priv->staging_rxon.ofdm_basic_rates;
	rxon_assoc.cck_basic_rates = priv->staging_rxon.cck_basic_rates;
	rxon_assoc.reserved1 = 0;
	rxon_assoc.reserved2 = 0;
	rxon_assoc.reserved3 = 0;
	rxon_assoc.ofdm_ht_single_stream_basic_rates =
	priv->staging_rxon.ofdm_ht_single_stream_basic_rates;
	rxon_assoc.ofdm_ht_dual_stream_basic_rates =
	priv->staging_rxon.ofdm_ht_dual_stream_basic_rates;
	rxon_assoc.rx_chain_select_flags = priv->staging_rxon.rx_chain;
	rxon_assoc.ofdm_ht_triple_stream_basic_rates =
	priv->staging_rxon.ofdm_ht_triple_stream_basic_rates;
	rxon_assoc.acquisition_data = priv->staging_rxon.acquisition_data;

	ret = iwl_send_cmd_pdu_async(priv, REPLY_RXON_ASSOC,
	sizeof(rxon_assoc), &rxon_assoc, NULL);
	if (ret)
	return ret;

	return ret;
	}

	static int iwlagn_send_tx_ant_config(struct iwl_priv *priv, u8 valid_tx_ant)
	{
	struct iwl_tx_ant_config_cmd tx_ant_cmd = {
	.valid = cpu_to_le32(valid_tx_ant),
	};

	if (IWL_UCODE_API(priv->ucode_ver) > 1) {
	IWL_DEBUG_HC(priv, "select valid tx ant: %u\n", valid_tx_ant);
	return iwl_send_cmd_pdu(priv, TX_ANT_CONFIGURATION_CMD,
	sizeof(struct iwl_tx_ant_config_cmd),
	&tx_ant_cmd);
	} else {
	IWL_DEBUG_HC(priv, "TX_ANT_CONFIGURATION_CMD not supported\n");
	return -EOPNOTSUPP;
	}
	}

	/* Currently this is the superset of everything */
	static u16 iwlagn_get_hcmd_size(u8 cmd_id, u16 len)
	{
	return len;
	}

	static u16 iwlagn_build_addsta_hcmd(const struct iwl_addsta_cmd cmd, u8 data)
	{
	u16 size = (u16)sizeof(struct iwl_addsta_cmd);
	struct iwl_addsta_cmd addsta = (struct iwl_addsta_cmd )data;
	memcpy(addsta, cmd, size);
	/* resrved in 5000 */
	addsta->rate_n_flags = cpu_to_le16(0);
	return size;
	}

	static void iwlagn_gain_computation(struct iwl_priv *priv,
	u32 average_noise[NUM_RX_CHAINS],
	u16 min_average_noise_antenna_i,
	u32 min_average_noise,
	u8 default_chain)
	{
	int i;
	s32 delta_g;
	struct iwl_chain_noise_data *data = &priv->chain_noise_data;

	/*
	* Find Gain Code for the chains based on "default chain"
	*/
	for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {
	if ((data->disconn_array[i])) {
	data->delta_gain_code[i] = 0;
	continue;
	}

	delta_g = (priv->cfg->chain_noise_scale *
	((s32)average_noise[default_chain] -
	(s32)average_noise[i])) / 1500;

	/* bound gain by 2 bits value max, 3rd bit is sign */
	data->delta_gain_code[i] =
	min(abs(delta_g), (long) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);

	if (delta_g < 0)
	/*
	* set negative sign ...
	* note to Intel developers: This is uCode API format,
	* not the format of any internal device registers.
	* Do not change this format for e.g. 6050 or similar
	* devices. Change format only if more resolution
	* (i.e. more than 2 bits magnitude) is needed.
	*/
	data->delta_gain_code[i] \|= (1 << 2);
	}

	IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d ANT_C = %d\n",
	data->delta_gain_code[1], data->delta_gain_code[2]);

	if (!data->radio_write) {
	struct iwl_calib_chain_noise_gain_cmd cmd;

	memset(&cmd, 0, sizeof(cmd));

	cmd.hdr.op_code = IWL_PHY_CALIBRATE_CHAIN_NOISE_GAIN_CMD;
	cmd.hdr.first_group = 0;
	cmd.hdr.groups_num = 1;
	cmd.hdr.data_valid = 1;
	cmd.delta_gain_1 = data->delta_gain_code[1];
	cmd.delta_gain_2 = data->delta_gain_code[2];
	iwl_send_cmd_pdu_async(priv, REPLY_PHY_CALIBRATION_CMD,
	sizeof(cmd), &cmd, NULL);

	data->radio_write = 1;
	data->state = IWL_CHAIN_NOISE_CALIBRATED;
	}

	data->chain_noise_a = 0;
	data->chain_noise_b = 0;
	data->chain_noise_c = 0;
	data->chain_signal_a = 0;
	data->chain_signal_b = 0;
	data->chain_signal_c = 0;
	data->beacon_count = 0;
	}

	static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
	{
	struct iwl_chain_noise_data *data = &priv->chain_noise_data;
	int ret;

	if ((data->state == IWL_CHAIN_NOISE_ALIVE) && iwl_is_associated(priv)) {
	struct iwl_calib_chain_noise_reset_cmd cmd;
	memset(&cmd, 0, sizeof(cmd));

	cmd.hdr.op_code = IWL_PHY_CALIBRATE_CHAIN_NOISE_RESET_CMD;
	cmd.hdr.first_group = 0;
	cmd.hdr.groups_num = 1;
	cmd.hdr.data_valid = 1;
	ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
	sizeof(cmd), &cmd);
	if (ret)
	IWL_ERR(priv,
	"Could not send REPLY_PHY_CALIBRATION_CMD\n");
	data->state = IWL_CHAIN_NOISE_ACCUMULATE;
	IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
	}
	}

	static void iwlagn_rts_tx_cmd_flag(struct ieee80211_tx_info *info,
	__le32 *tx_flags)
	{
	if ((info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) \|\|
	(info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
	*tx_flags \|= TX_CMD_FLG_RTS_CTS_MSK;
	else
	*tx_flags &= ~TX_CMD_FLG_RTS_CTS_MSK;
	}

	/* Calc max signal level (dBm) among 3 possible receivers */
	static int iwlagn_calc_rssi(struct iwl_priv *priv,
	struct iwl_rx_phy_res *rx_resp)
	{
	/* data from PHY/DSP regarding signal strength, etc.,
	* contents are always there, not configurable by host
	*/
	struct iwl5000_non_cfg_phy *ncphy =
	(struct iwl5000_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
	u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
	u8 agc;

	val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_AGC_IDX]);
	agc = (val & IWL50_OFDM_AGC_MSK) >> IWL50_OFDM_AGC_BIT_POS;

	/* Find max rssi among 3 possible receivers.
	* These values are measured by the digital signal processor (DSP).
	* They should stay fairly constant even as the signal strength varies,
	* if the radio's automatic gain control (AGC) is working right.
	* AGC value (see below) will provide the "interesting" info.
	*/
	val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_RSSI_AB_IDX]);
	rssi_a = (val & IWL50_OFDM_RSSI_A_MSK) >> IWL50_OFDM_RSSI_A_BIT_POS;
	rssi_b = (val & IWL50_OFDM_RSSI_B_MSK) >> IWL50_OFDM_RSSI_B_BIT_POS;
	val = le32_to_cpu(ncphy->non_cfg_phy[IWL50_RX_RES_RSSI_C_IDX]);
	rssi_c = (val & IWL50_OFDM_RSSI_C_MSK) >> IWL50_OFDM_RSSI_C_BIT_POS;

	max_rssi = max_t(u32, rssi_a, rssi_b);
	max_rssi = max_t(u32, max_rssi, rssi_c);

	IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
	rssi_a, rssi_b, rssi_c, max_rssi, agc);

	/* dBm = max_rssi dB - agc dB - constant.
	* Higher AGC (higher radio gain) means lower signal. */
	return max_rssi - agc - IWLAGN_RSSI_OFFSET;
	}

	struct iwl_hcmd_ops iwlagn_hcmd = {
	.rxon_assoc = iwlagn_send_rxon_assoc,
	.commit_rxon = iwl_commit_rxon,
	.set_rxon_chain = iwl_set_rxon_chain,
	.set_tx_ant = iwlagn_send_tx_ant_config,
	.send_bt_config = iwl_send_bt_config,
	};

	struct iwl_hcmd_utils_ops iwlagn_hcmd_utils = {
	.get_hcmd_size = iwlagn_get_hcmd_size,
	.build_addsta_hcmd = iwlagn_build_addsta_hcmd,
	.gain_computation = iwlagn_gain_computation,
	.chain_noise_reset = iwlagn_chain_noise_reset,
	.rts_tx_cmd_flag = iwlagn_rts_tx_cmd_flag,
	.calc_rssi = iwlagn_calc_rssi,
	.request_scan = iwlagn_request_scan,
	};