drivers/net/wireless/iwlwifi/iwl-power.c - kernel/msm-4.9 - Gitiles

 /******************************************************************************
  *
  * Copyright(c) 2007 - 2009 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
  *****************************************************************************/


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

 #include <net/mac80211.h>

 #include "iwl-eeprom.h"
 #include "iwl-dev.h"
 #include "iwl-core.h"
 #include "iwl-commands.h"
 #include "iwl-debug.h"
 #include "iwl-power.h"

 /*
  * Setting power level allow the card to go to sleep when not busy
  * there are three factor that decide the power level to go to, they
  * are list here with its priority
  *  1- critical_power_setting this will be set according to card temperature.
  *  2- system_power_setting this will be set by system PM manager.
  *  3- user_power_setting this will be set by user either by writing to sys or
  *  	mac80211
  *
  * if system_power_setting and user_power_setting is set to auto
  * the power level will be decided according to association status and battery
  * status.
  *
  */

 #define MSEC_TO_USEC 1024
 #define IWL_POWER_RANGE_0_MAX  (2)
 #define IWL_POWER_RANGE_1_MAX  (10)


 #define IWL_POWER_ON_BATTERY		IWL_POWER_INDEX_5
 #define IWL_POWER_ON_AC_DISASSOC	IWL_POWER_MODE_CAM
 #define IWL_POWER_ON_AC_ASSOC		IWL_POWER_MODE_CAM


 #define IWL_CT_KILL_TEMPERATURE		110
 #define IWL_MIN_POWER_TEMPERATURE	100
 #define IWL_REDUCED_POWER_TEMPERATURE	95

 /* default power management (not Tx power) table values */
 /* for TIM  0-10 */
 static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
 	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
 	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
 	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
 	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
 	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
 	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
 };


 /* for TIM = 3-10 */
 static struct iwl_power_vec_entry range_1[IWL_POWER_MAX] = {
 	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
 	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
 	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
 	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
 	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
 	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
 };

 /* for TIM > 11 */
 static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
 	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
 	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
 	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 };


 /* set card power command */
 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
 {
 	return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
 				      sizeof(struct iwl_powertable_cmd),
 				      cmd, NULL);
 }
 /* decide the right power level according to association status
  * and battery status
  */
 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
 {
 	u16 mode;

 	switch (priv->power_data.user_power_setting) {
 	case IWL_POWER_AUTO:
 		/* if running on battery */
 		if (priv->power_data.is_battery_active)
 			mode = IWL_POWER_ON_BATTERY;
 		else if (iwl_is_associated(priv))
 			mode = IWL_POWER_ON_AC_ASSOC;
 		else
 			mode = IWL_POWER_ON_AC_DISASSOC;
 		break;
 	default:
 		mode = priv->power_data.user_power_setting;
 		break;
 	}
 	return mode;
 }

 /* initialize to default */
 static void iwl_power_init_handle(struct iwl_priv *priv)
 {
 	struct iwl_power_mgr *pow_data;
 	int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
 	struct iwl_powertable_cmd *cmd;
 	int i;
 	u16 lctl;

 	IWL_DEBUG_POWER(priv, "Initialize power \n");

 	pow_data = &priv->power_data;

 	memset(pow_data, 0, sizeof(*pow_data));

 	memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
 	memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 	memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);

 	lctl = iwl_pcie_link_ctl(priv);

 	IWL_DEBUG_POWER(priv, "adjust power command flags\n");

 	for (i = 0; i < IWL_POWER_MAX; i++) {
 		cmd = &pow_data->pwr_range_0[i].cmd;

 		if (lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
 			cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 		else
 			cmd->flags |= IWL_POWER_PCI_PM_MSK;
 	}
 }

 /* adjust power command according to DTIM period and power level*/
 static int iwl_update_power_cmd(struct iwl_priv *priv,
 				struct iwl_powertable_cmd *cmd, u16 mode)
 {
 	struct iwl_power_vec_entry *range;
 	struct iwl_power_mgr *pow_data;
 	int i;
 	u32 max_sleep = 0;
 	u8 period;
 	bool skip;

 	if (mode > IWL_POWER_INDEX_5) {
 		IWL_DEBUG_POWER(priv, "Error invalid power mode \n");
 		return -EINVAL;
 	}

 	pow_data = &priv->power_data;

 	if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
 		range = &pow_data->pwr_range_0[0];
 	else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
 		range = &pow_data->pwr_range_1[0];
 	else
 		range = &pow_data->pwr_range_2[0];

 	period = pow_data->dtim_period;
 	memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));

 	if (period == 0) {
 		period = 1;
 		skip = false;
 	} else {
 		skip = !!range[mode].no_dtim;
 	}

 	if (skip) {
 		__le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
 		max_sleep = le32_to_cpu(slp_itrvl);
 		if (max_sleep == 0xFF)
 			max_sleep = period * (skip + 1);
 		else if (max_sleep >  period)
 			max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
 		cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 	} else {
 		max_sleep = period;
 		cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 	}

 	for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 		if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
 			cmd->sleep_interval[i] = cpu_to_le32(max_sleep);

 	IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 	IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 	IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 	IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 			le32_to_cpu(cmd->sleep_interval[0]),
 			le32_to_cpu(cmd->sleep_interval[1]),
 			le32_to_cpu(cmd->sleep_interval[2]),
 			le32_to_cpu(cmd->sleep_interval[3]),
 			le32_to_cpu(cmd->sleep_interval[4]));

 	return 0;
 }


 /*
  * compute the final power mode index
  */
 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 {
 	struct iwl_power_mgr *setting = &(priv->power_data);
 	int ret = 0;
 	u16 uninitialized_var(final_mode);
 	bool update_chains;

 	/* Don't update the RX chain when chain noise calibration is running */
 	update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 			priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;

 	/* If on battery, set to 3,
 	 * if plugged into AC power, set to CAM ("continuously aware mode"),
 	 * else user level */

 	switch (setting->system_power_setting) {
 	case IWL_POWER_SYS_AUTO:
 		final_mode = iwl_get_auto_power_mode(priv);
 		break;
 	case IWL_POWER_SYS_BATTERY:
 		final_mode = IWL_POWER_INDEX_3;
 		break;
 	case IWL_POWER_SYS_AC:
 		final_mode = IWL_POWER_MODE_CAM;
 		break;
 	default:
 		final_mode = IWL_POWER_INDEX_3;
 		WARN_ON(1);
 	}

 	if (setting->critical_power_setting > final_mode)
 		final_mode = setting->critical_power_setting;

 	/* driver only support CAM for non STA network */
 	if (priv->iw_mode != NL80211_IFTYPE_STATION)
 		final_mode = IWL_POWER_MODE_CAM;

 	if (iwl_is_ready_rf(priv) && !setting->power_disabled &&
 	    ((setting->power_mode != final_mode) || force)) {
 		struct iwl_powertable_cmd cmd;

 		if (final_mode != IWL_POWER_MODE_CAM)
 			set_bit(STATUS_POWER_PMI, &priv->status);

 		iwl_update_power_cmd(priv, &cmd, final_mode);
 		cmd.keep_alive_beacons = 0;

 		if (final_mode == IWL_POWER_INDEX_5)
 			cmd.flags |= IWL_POWER_FAST_PD;

 		ret = iwl_set_power(priv, &cmd);

 		if (final_mode == IWL_POWER_MODE_CAM)
 			clear_bit(STATUS_POWER_PMI, &priv->status);
 		else
 			set_bit(STATUS_POWER_PMI, &priv->status);

 		if (priv->cfg->ops->lib->update_chain_flags && update_chains)
 			priv->cfg->ops->lib->update_chain_flags(priv);
 		else
 			IWL_DEBUG_POWER(priv, "Cannot update the power, chain noise "
 					"calibration running: %d\n",
 					priv->chain_noise_data.state);
 		if (!ret)
 			setting->power_mode = final_mode;
 	}

 	return ret;
 }
 EXPORT_SYMBOL(iwl_power_update_mode);

 /* Allow other iwl code to disable/enable power management active
  * this will be useful for rate scale to disable PM during heavy
  * Tx/Rx activities
  */
 int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
 {
 	u16 prev_mode;
 	int ret = 0;

 	if (priv->power_data.power_disabled)
 		return -EBUSY;

 	prev_mode = priv->power_data.user_power_setting;
 	priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
 	ret = iwl_power_update_mode(priv, 0);
 	priv->power_data.power_disabled = 1;
 	priv->power_data.user_power_setting = prev_mode;
 	cancel_delayed_work(&priv->set_power_save);
 	if (ms)
 		queue_delayed_work(priv->workqueue, &priv->set_power_save,
 				   msecs_to_jiffies(ms));


 	return ret;
 }
 EXPORT_SYMBOL(iwl_power_disable_management);

 /* Allow other iwl code to disable/enable power management active
  * this will be useful for rate scale to disable PM during high
  * volume activities
  */
 int iwl_power_enable_management(struct iwl_priv *priv)
 {
 	int ret = 0;

 	priv->power_data.power_disabled = 0;
 	ret = iwl_power_update_mode(priv, 0);
 	return ret;
 }
 EXPORT_SYMBOL(iwl_power_enable_management);

 /* set user_power_setting */
 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
 {
 	if (mode > IWL_POWER_MAX)
 		return -EINVAL;

 	priv->power_data.user_power_setting = mode;

 	return iwl_power_update_mode(priv, 0);
 }
 EXPORT_SYMBOL(iwl_power_set_user_mode);

 /* set system_power_setting. This should be set by over all
  * PM application.
  */
 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
 {
 	if (mode < IWL_POWER_SYS_MAX)
 		priv->power_data.system_power_setting = mode;
 	else
 		return -EINVAL;
 	return iwl_power_update_mode(priv, 0);
 }
 EXPORT_SYMBOL(iwl_power_set_system_mode);

 /* initialize to default */
 void iwl_power_initialize(struct iwl_priv *priv)
 {
 	iwl_power_init_handle(priv);
 	priv->power_data.user_power_setting = IWL_POWER_AUTO;
 	priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
 	priv->power_data.power_disabled = 0;
 	priv->power_data.is_battery_active = 0;
 	priv->power_data.critical_power_setting = 0;
 }
 EXPORT_SYMBOL(iwl_power_initialize);

 /* set critical_power_setting according to temperature value */
 int iwl_power_temperature_change(struct iwl_priv *priv)
 {
 	int ret = 0;
 	s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
 	u16 new_critical = priv->power_data.critical_power_setting;

 	if (temperature > IWL_CT_KILL_TEMPERATURE)
 		return 0;
 	else if (temperature > IWL_MIN_POWER_TEMPERATURE)
 		new_critical = IWL_POWER_INDEX_5;
 	else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
 		new_critical = IWL_POWER_INDEX_3;
 	else
 		new_critical = IWL_POWER_MODE_CAM;

 	if (new_critical != priv->power_data.critical_power_setting)
 		priv->power_data.critical_power_setting = new_critical;

 	if (priv->power_data.critical_power_setting >
 				priv->power_data.power_mode)
 		ret = iwl_power_update_mode(priv, 0);

 	return ret;
 }
 EXPORT_SYMBOL(iwl_power_temperature_change);

 static void iwl_bg_set_power_save(struct work_struct *work)
 {
 	struct iwl_priv *priv = container_of(work,
 				struct iwl_priv, set_power_save.work);
 	IWL_DEBUG_POWER(priv, "update power\n");

 	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 		return;

 	mutex_lock(&priv->mutex);

 	/* on starting association we disable power management
 	 * until association, if association failed then this
 	 * timer will expire and enable PM again.
 	 */
 	if (!iwl_is_associated(priv))
 		iwl_power_enable_management(priv);

 	mutex_unlock(&priv->mutex);
 }
 void iwl_setup_power_deferred_work(struct iwl_priv *priv)
 {
 	INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
 }
 EXPORT_SYMBOL(iwl_setup_power_deferred_work);

 void iwl_power_cancel_timeout(struct iwl_priv *priv)
 {
 	cancel_delayed_work(&priv->set_power_save);
 }
 EXPORT_SYMBOL(iwl_power_cancel_timeout);
	/******************************************************************************
	*
	* Copyright(c) 2007 - 2009 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
	*****************************************************************************/


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

	#include <net/mac80211.h>

	#include "iwl-eeprom.h"
	#include "iwl-dev.h"
	#include "iwl-core.h"
	#include "iwl-commands.h"
	#include "iwl-debug.h"
	#include "iwl-power.h"

	/*
	* Setting power level allow the card to go to sleep when not busy
	* there are three factor that decide the power level to go to, they
	* are list here with its priority
	* 1- critical_power_setting this will be set according to card temperature.
	* 2- system_power_setting this will be set by system PM manager.
	* 3- user_power_setting this will be set by user either by writing to sys or
	* mac80211
	*
	* if system_power_setting and user_power_setting is set to auto
	* the power level will be decided according to association status and battery
	* status.
	*
	*/

	#define MSEC_TO_USEC 1024
	#define IWL_POWER_RANGE_0_MAX (2)
	#define IWL_POWER_RANGE_1_MAX (10)



	#define IWL_POWER_ON_BATTERY IWL_POWER_INDEX_5
	#define IWL_POWER_ON_AC_DISASSOC IWL_POWER_MODE_CAM
	#define IWL_POWER_ON_AC_ASSOC IWL_POWER_MODE_CAM


	#define IWL_CT_KILL_TEMPERATURE 110
	#define IWL_MIN_POWER_TEMPERATURE 100
	#define IWL_REDUCED_POWER_TEMPERATURE 95

	/* default power management (not Tx power) table values */
	/* for TIM 0-10 */
	static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
	};


	/* for TIM = 3-10 */
	static struct iwl_power_vec_entry range_1[IWL_POWER_MAX] = {
	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
	};

	/* for TIM > 11 */
	static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
	{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
	};


	/* set card power command */
	static int iwl_set_power(struct iwl_priv priv, void cmd)
	{
	return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
	sizeof(struct iwl_powertable_cmd),
	cmd, NULL);
	}
	/* decide the right power level according to association status
	* and battery status
	*/
	static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
	{
	u16 mode;

	switch (priv->power_data.user_power_setting) {
	case IWL_POWER_AUTO:
	/* if running on battery */
	if (priv->power_data.is_battery_active)
	mode = IWL_POWER_ON_BATTERY;
	else if (iwl_is_associated(priv))
	mode = IWL_POWER_ON_AC_ASSOC;
	else
	mode = IWL_POWER_ON_AC_DISASSOC;
	break;
	default:
	mode = priv->power_data.user_power_setting;
	break;
	}
	return mode;
	}

	/* initialize to default */
	static void iwl_power_init_handle(struct iwl_priv *priv)
	{
	struct iwl_power_mgr *pow_data;
	int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
	struct iwl_powertable_cmd *cmd;
	int i;
	u16 lctl;

	IWL_DEBUG_POWER(priv, "Initialize power \n");

	pow_data = &priv->power_data;

	memset(pow_data, 0, sizeof(*pow_data));

	memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
	memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
	memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);

	lctl = iwl_pcie_link_ctl(priv);

	IWL_DEBUG_POWER(priv, "adjust power command flags\n");

	for (i = 0; i < IWL_POWER_MAX; i++) {
	cmd = &pow_data->pwr_range_0[i].cmd;

	if (lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
	cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
	else
	cmd->flags \|= IWL_POWER_PCI_PM_MSK;
	}
	}

	/* adjust power command according to DTIM period and power level*/
	static int iwl_update_power_cmd(struct iwl_priv *priv,
	struct iwl_powertable_cmd *cmd, u16 mode)
	{
	struct iwl_power_vec_entry *range;
	struct iwl_power_mgr *pow_data;
	int i;
	u32 max_sleep = 0;
	u8 period;
	bool skip;

	if (mode > IWL_POWER_INDEX_5) {
	IWL_DEBUG_POWER(priv, "Error invalid power mode \n");
	return -EINVAL;
	}

	pow_data = &priv->power_data;

	if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
	range = &pow_data->pwr_range_0[0];
	else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
	range = &pow_data->pwr_range_1[0];
	else
	range = &pow_data->pwr_range_2[0];

	period = pow_data->dtim_period;
	memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));

	if (period == 0) {
	period = 1;
	skip = false;
	} else {
	skip = !!range[mode].no_dtim;
	}

	if (skip) {
	__le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
	max_sleep = le32_to_cpu(slp_itrvl);
	if (max_sleep == 0xFF)
	max_sleep = period * (skip + 1);
	else if (max_sleep > period)
	max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
	cmd->flags \|= IWL_POWER_SLEEP_OVER_DTIM_MSK;
	} else {
	max_sleep = period;
	cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
	}

	for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
	if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
	cmd->sleep_interval[i] = cpu_to_le32(max_sleep);

	IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
	IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
	IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
	IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
	le32_to_cpu(cmd->sleep_interval[0]),
	le32_to_cpu(cmd->sleep_interval[1]),
	le32_to_cpu(cmd->sleep_interval[2]),
	le32_to_cpu(cmd->sleep_interval[3]),
	le32_to_cpu(cmd->sleep_interval[4]));

	return 0;
	}


	/*
	* compute the final power mode index
	*/
	int iwl_power_update_mode(struct iwl_priv *priv, bool force)
	{
	struct iwl_power_mgr *setting = &(priv->power_data);
	int ret = 0;
	u16 uninitialized_var(final_mode);
	bool update_chains;

	/* Don't update the RX chain when chain noise calibration is running */
	update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE \|\|
	priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;

	/* If on battery, set to 3,
	* if plugged into AC power, set to CAM ("continuously aware mode"),
	* else user level */

	switch (setting->system_power_setting) {
	case IWL_POWER_SYS_AUTO:
	final_mode = iwl_get_auto_power_mode(priv);
	break;
	case IWL_POWER_SYS_BATTERY:
	final_mode = IWL_POWER_INDEX_3;
	break;
	case IWL_POWER_SYS_AC:
	final_mode = IWL_POWER_MODE_CAM;
	break;
	default:
	final_mode = IWL_POWER_INDEX_3;
	WARN_ON(1);
	}

	if (setting->critical_power_setting > final_mode)
	final_mode = setting->critical_power_setting;

	/* driver only support CAM for non STA network */
	if (priv->iw_mode != NL80211_IFTYPE_STATION)
	final_mode = IWL_POWER_MODE_CAM;

	if (iwl_is_ready_rf(priv) && !setting->power_disabled &&
	((setting->power_mode != final_mode) \|\| force)) {
	struct iwl_powertable_cmd cmd;

	if (final_mode != IWL_POWER_MODE_CAM)
	set_bit(STATUS_POWER_PMI, &priv->status);

	iwl_update_power_cmd(priv, &cmd, final_mode);
	cmd.keep_alive_beacons = 0;

	if (final_mode == IWL_POWER_INDEX_5)
	cmd.flags \|= IWL_POWER_FAST_PD;

	ret = iwl_set_power(priv, &cmd);

	if (final_mode == IWL_POWER_MODE_CAM)
	clear_bit(STATUS_POWER_PMI, &priv->status);
	else
	set_bit(STATUS_POWER_PMI, &priv->status);

	if (priv->cfg->ops->lib->update_chain_flags && update_chains)
	priv->cfg->ops->lib->update_chain_flags(priv);
	else
	IWL_DEBUG_POWER(priv, "Cannot update the power, chain noise "
	"calibration running: %d\n",
	priv->chain_noise_data.state);
	if (!ret)
	setting->power_mode = final_mode;
	}

	return ret;
	}
	EXPORT_SYMBOL(iwl_power_update_mode);

	/* Allow other iwl code to disable/enable power management active
	* this will be useful for rate scale to disable PM during heavy
	* Tx/Rx activities
	*/
	int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
	{
	u16 prev_mode;
	int ret = 0;

	if (priv->power_data.power_disabled)
	return -EBUSY;

	prev_mode = priv->power_data.user_power_setting;
	priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
	ret = iwl_power_update_mode(priv, 0);
	priv->power_data.power_disabled = 1;
	priv->power_data.user_power_setting = prev_mode;
	cancel_delayed_work(&priv->set_power_save);
	if (ms)
	queue_delayed_work(priv->workqueue, &priv->set_power_save,
	msecs_to_jiffies(ms));


	return ret;
	}
	EXPORT_SYMBOL(iwl_power_disable_management);

	/* Allow other iwl code to disable/enable power management active
	* this will be useful for rate scale to disable PM during high
	* volume activities
	*/
	int iwl_power_enable_management(struct iwl_priv *priv)
	{
	int ret = 0;

	priv->power_data.power_disabled = 0;
	ret = iwl_power_update_mode(priv, 0);
	return ret;
	}
	EXPORT_SYMBOL(iwl_power_enable_management);

	/* set user_power_setting */
	int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
	{
	if (mode > IWL_POWER_MAX)
	return -EINVAL;

	priv->power_data.user_power_setting = mode;

	return iwl_power_update_mode(priv, 0);
	}
	EXPORT_SYMBOL(iwl_power_set_user_mode);

	/* set system_power_setting. This should be set by over all
	* PM application.
	*/
	int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
	{
	if (mode < IWL_POWER_SYS_MAX)
	priv->power_data.system_power_setting = mode;
	else
	return -EINVAL;
	return iwl_power_update_mode(priv, 0);
	}
	EXPORT_SYMBOL(iwl_power_set_system_mode);

	/* initialize to default */
	void iwl_power_initialize(struct iwl_priv *priv)
	{
	iwl_power_init_handle(priv);
	priv->power_data.user_power_setting = IWL_POWER_AUTO;
	priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
	priv->power_data.power_disabled = 0;
	priv->power_data.is_battery_active = 0;
	priv->power_data.critical_power_setting = 0;
	}
	EXPORT_SYMBOL(iwl_power_initialize);

	/* set critical_power_setting according to temperature value */
	int iwl_power_temperature_change(struct iwl_priv *priv)
	{
	int ret = 0;
	s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
	u16 new_critical = priv->power_data.critical_power_setting;

	if (temperature > IWL_CT_KILL_TEMPERATURE)
	return 0;
	else if (temperature > IWL_MIN_POWER_TEMPERATURE)
	new_critical = IWL_POWER_INDEX_5;
	else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
	new_critical = IWL_POWER_INDEX_3;
	else
	new_critical = IWL_POWER_MODE_CAM;

	if (new_critical != priv->power_data.critical_power_setting)
	priv->power_data.critical_power_setting = new_critical;

	if (priv->power_data.critical_power_setting >
	priv->power_data.power_mode)
	ret = iwl_power_update_mode(priv, 0);

	return ret;
	}
	EXPORT_SYMBOL(iwl_power_temperature_change);

	static void iwl_bg_set_power_save(struct work_struct *work)
	{
	struct iwl_priv *priv = container_of(work,
	struct iwl_priv, set_power_save.work);
	IWL_DEBUG_POWER(priv, "update power\n");

	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
	return;

	mutex_lock(&priv->mutex);

	/* on starting association we disable power management
	* until association, if association failed then this
	* timer will expire and enable PM again.
	*/
	if (!iwl_is_associated(priv))
	iwl_power_enable_management(priv);

	mutex_unlock(&priv->mutex);
	}
	void iwl_setup_power_deferred_work(struct iwl_priv *priv)
	{
	INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
	}
	EXPORT_SYMBOL(iwl_setup_power_deferred_work);

	void iwl_power_cancel_timeout(struct iwl_priv *priv)
	{
	cancel_delayed_work(&priv->set_power_save);
	}
	EXPORT_SYMBOL(iwl_power_cancel_timeout);