tt.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) 2013 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
 *
 * 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 COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
 * 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/sort.h>

#include "mvm.h"

#define IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT	HZ

static void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
{
	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
	u32 duration = tt->params.ct_kill_duration;

	if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
		return;

	IWL_ERR(mvm, "Enter CT Kill\n");
	iwl_mvm_set_hw_ctkill_state(mvm, true);

	if (!iwl_mvm_is_tt_in_fw(mvm)) {
		tt->throttle = false;
		tt->dynamic_smps = false;
	}

	/* Don't schedule an exit work if we're in test mode, since
	 * the temperature will not change unless we manually set it
	 * again (or disable testing).
	 */
	if (!mvm->temperature_test)
		schedule_delayed_work(&tt->ct_kill_exit,
				      round_jiffies_relative(duration * HZ));
}

static void iwl_mvm_exit_ctkill(struct iwl_mvm *mvm)
{
	if (!test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
		return;

	IWL_ERR(mvm, "Exit CT Kill\n");
	iwl_mvm_set_hw_ctkill_state(mvm, false);
}

void iwl_mvm_tt_temp_changed(struct iwl_mvm *mvm, u32 temp)
{
	/* ignore the notification if we are in test mode */
	if (mvm->temperature_test)
		return;

	if (mvm->temperature == temp)
		return;

	mvm->temperature = temp;
	iwl_mvm_tt_handler(mvm);
}

static int iwl_mvm_temp_notif_parse(struct iwl_mvm *mvm,
				    struct iwl_rx_packet *pkt)
{
	struct iwl_dts_measurement_notif_v1 *notif_v1;
	int len = iwl_rx_packet_payload_len(pkt);
	int temp;

	/* we can use notif_v1 only, because v2 only adds an additional
	 * parameter, which is not used in this function.
	*/
	if (WARN_ON_ONCE(len < sizeof(*notif_v1))) {
		IWL_ERR(mvm, "Invalid DTS_MEASUREMENT_NOTIFICATION\n");
		return -EINVAL;
	}

	notif_v1 = (void *)pkt->data;

	temp = le32_to_cpu(notif_v1->temp);

	/* shouldn't be negative, but since it's s32, make sure it isn't */
	if (WARN_ON_ONCE(temp < 0))
		temp = 0;

	IWL_DEBUG_TEMP(mvm, "DTS_MEASUREMENT_NOTIFICATION - %d\n", temp);

	return temp;
}

static bool iwl_mvm_temp_notif_wait(struct iwl_notif_wait_data *notif_wait,
				    struct iwl_rx_packet *pkt, void *data)
{
	struct iwl_mvm *mvm =
		container_of(notif_wait, struct iwl_mvm, notif_wait);
	int *temp = data;
	int ret;

	ret = iwl_mvm_temp_notif_parse(mvm, pkt);
	if (ret < 0)
		return true;

	*temp = ret;

	return true;
}

void iwl_mvm_temp_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_dts_measurement_notif_v2 *notif_v2;
	int len = iwl_rx_packet_payload_len(pkt);
	int temp;
	u32 ths_crossed;

	/* the notification is handled synchronously in ctkill, so skip here */
	if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
		return;

	temp = iwl_mvm_temp_notif_parse(mvm, pkt);

	if (!iwl_mvm_is_tt_in_fw(mvm)) {
		if (temp >= 0)
			iwl_mvm_tt_temp_changed(mvm, temp);
		return;
	}

	if (WARN_ON_ONCE(len < sizeof(*notif_v2))) {
		IWL_ERR(mvm, "Invalid DTS_MEASUREMENT_NOTIFICATION\n");
		return;
	}

	notif_v2 = (void *)pkt->data;
	ths_crossed = le32_to_cpu(notif_v2->threshold_idx);

	/* 0xFF in ths_crossed means the notification is not related
	 * to a trip, so we can ignore it here.
	 */
	if (ths_crossed == 0xFF)
		return;

	IWL_DEBUG_TEMP(mvm, "Temp = %d Threshold crossed = %d\n",
		       temp, ths_crossed);

#ifdef CONFIG_THERMAL
	if (WARN_ON(ths_crossed >= IWL_MAX_DTS_TRIPS))
		return;

	if (mvm->tz_device.tzone) {
		struct iwl_mvm_thermal_device *tz_dev = &mvm->tz_device;

		thermal_notify_framework(tz_dev->tzone,
					 tz_dev->fw_trips_index[ths_crossed]);
	}
#endif /* CONFIG_THERMAL */
}

void iwl_mvm_ct_kill_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct ct_kill_notif *notif;
	int len = iwl_rx_packet_payload_len(pkt);

	if (WARN_ON_ONCE(len != sizeof(*notif))) {
		IWL_ERR(mvm, "Invalid CT_KILL_NOTIFICATION\n");
		return;
	}

	notif = (struct ct_kill_notif *)pkt->data;
	IWL_DEBUG_TEMP(mvm, "CT Kill notification temperature = %d\n",
		       notif->temperature);

	iwl_mvm_enter_ctkill(mvm);
}

static int iwl_mvm_get_temp_cmd(struct iwl_mvm *mvm)
{
	struct iwl_dts_measurement_cmd cmd = {
		.flags = cpu_to_le32(DTS_TRIGGER_CMD_FLAGS_TEMP),
	};
	struct iwl_ext_dts_measurement_cmd extcmd = {
		.control_mode = cpu_to_le32(DTS_AUTOMATIC),
	};
	u32 cmdid;

	cmdid = iwl_cmd_id(CMD_DTS_MEASUREMENT_TRIGGER_WIDE,
			   PHY_OPS_GROUP, 0);

	if (!fw_has_capa(&mvm->fw->ucode_capa,
			 IWL_UCODE_TLV_CAPA_EXTENDED_DTS_MEASURE))
		return iwl_mvm_send_cmd_pdu(mvm, cmdid, 0, sizeof(cmd), &cmd);

	return iwl_mvm_send_cmd_pdu(mvm, cmdid, 0, sizeof(extcmd), &extcmd);
}

int iwl_mvm_get_temp(struct iwl_mvm *mvm, s32 *temp)
{
	struct iwl_notification_wait wait_temp_notif;
	static u16 temp_notif[] = { WIDE_ID(PHY_OPS_GROUP,
					    DTS_MEASUREMENT_NOTIF_WIDE) };
	int ret;

	lockdep_assert_held(&mvm->mutex);

	iwl_init_notification_wait(&mvm->notif_wait, &wait_temp_notif,
				   temp_notif, ARRAY_SIZE(temp_notif),
				   iwl_mvm_temp_notif_wait, temp);

	ret = iwl_mvm_get_temp_cmd(mvm);
	if (ret) {
		IWL_ERR(mvm, "Failed to get the temperature (err=%d)\n", ret);
		iwl_remove_notification(&mvm->notif_wait, &wait_temp_notif);
		return ret;
	}

	ret = iwl_wait_notification(&mvm->notif_wait, &wait_temp_notif,
				    IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT);
	if (ret)
		IWL_ERR(mvm, "Getting the temperature timed out\n");

	return ret;
}

static void check_exit_ctkill(struct work_struct *work)
{
	struct iwl_mvm_tt_mgmt *tt;
	struct iwl_mvm *mvm;
	u32 duration;
	s32 temp;
	int ret;

	tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
	mvm = container_of(tt, struct iwl_mvm, thermal_throttle);

	if (iwl_mvm_is_tt_in_fw(mvm)) {
		iwl_mvm_exit_ctkill(mvm);

		return;
	}

	duration = tt->params.ct_kill_duration;

	mutex_lock(&mvm->mutex);

	if (__iwl_mvm_mac_start(mvm))
		goto reschedule;

	/* make sure the device is available for direct read/writes */
	if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_CHECK_CTKILL)) {
		__iwl_mvm_mac_stop(mvm);
		goto reschedule;
	}

	ret = iwl_mvm_get_temp(mvm, &temp);

	iwl_mvm_unref(mvm, IWL_MVM_REF_CHECK_CTKILL);

	__iwl_mvm_mac_stop(mvm);

	if (ret)
		goto reschedule;

	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);

	if (temp <= tt->params.ct_kill_exit) {
		mutex_unlock(&mvm->mutex);
		iwl_mvm_exit_ctkill(mvm);
		return;
	}

reschedule:
	mutex_unlock(&mvm->mutex);
	schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
			      round_jiffies(duration * HZ));
}

static void iwl_mvm_tt_smps_iterator(void *_data, u8 *mac,
				     struct ieee80211_vif *vif)
{
	struct iwl_mvm *mvm = _data;
	enum ieee80211_smps_mode smps_mode;

	lockdep_assert_held(&mvm->mutex);

	if (mvm->thermal_throttle.dynamic_smps)
		smps_mode = IEEE80211_SMPS_DYNAMIC;
	else
		smps_mode = IEEE80211_SMPS_AUTOMATIC;

	if (vif->type != NL80211_IFTYPE_STATION)
		return;

	iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
}

static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
{
	struct iwl_mvm_sta *mvmsta;
	int i, err;

	for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
		mvmsta = iwl_mvm_sta_from_staid_protected(mvm, i);
		if (!mvmsta)
			continue;

		if (enable == mvmsta->tt_tx_protection)
			continue;
		err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
		if (err) {
			IWL_ERR(mvm, "Failed to %s Tx protection\n",
				enable ? "enable" : "disable");
		} else {
			IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
				       enable ? "Enable" : "Disable");
			mvmsta->tt_tx_protection = enable;
		}
	}
}

void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
{
	struct iwl_host_cmd cmd = {
		.id = REPLY_THERMAL_MNG_BACKOFF,
		.len = { sizeof(u32), },
		.data = { &backoff, },
	};

	backoff = max(backoff, mvm->thermal_throttle.min_backoff);

	if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
		IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
			       backoff);
		mvm->thermal_throttle.tx_backoff = backoff;
	} else {
		IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
	}
}

void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
{
	struct iwl_tt_params *params = &mvm->thermal_throttle.params;
	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
	s32 temperature = mvm->temperature;
	bool throttle_enable = false;
	int i;
	u32 tx_backoff;

	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);

	if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
		iwl_mvm_enter_ctkill(mvm);
		return;
	}

	if (params->support_ct_kill &&
	    temperature <= params->ct_kill_exit) {
		iwl_mvm_exit_ctkill(mvm);
		return;
	}

	if (params->support_dynamic_smps) {
		if (!tt->dynamic_smps &&
		    temperature >= params->dynamic_smps_entry) {
			IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
			tt->dynamic_smps = true;
			ieee80211_iterate_active_interfaces_atomic(
					mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
					iwl_mvm_tt_smps_iterator, mvm);
			throttle_enable = true;
		} else if (tt->dynamic_smps &&
			   temperature <= params->dynamic_smps_exit) {
			IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
			tt->dynamic_smps = false;
			ieee80211_iterate_active_interfaces_atomic(
					mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
					iwl_mvm_tt_smps_iterator, mvm);
		}
	}

	if (params->support_tx_protection) {
		if (temperature >= params->tx_protection_entry) {
			iwl_mvm_tt_tx_protection(mvm, true);
			throttle_enable = true;
		} else if (temperature <= params->tx_protection_exit) {
			iwl_mvm_tt_tx_protection(mvm, false);
		}
	}

	if (params->support_tx_backoff) {
		tx_backoff = tt->min_backoff;
		for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
			if (temperature < params->tx_backoff[i].temperature)
				break;
			tx_backoff = max(tt->min_backoff,
					 params->tx_backoff[i].backoff);
		}
		if (tx_backoff != tt->min_backoff)
			throttle_enable = true;
		if (tt->tx_backoff != tx_backoff)
			iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
	}

	if (!tt->throttle && throttle_enable) {
		IWL_WARN(mvm,
			 "Due to high temperature thermal throttling initiated\n");
		tt->throttle = true;
	} else if (tt->throttle && !tt->dynamic_smps &&
		   tt->tx_backoff == tt->min_backoff &&
		   temperature <= params->tx_protection_exit) {
		IWL_WARN(mvm,
			 "Temperature is back to normal thermal throttling stopped\n");
		tt->throttle = false;
	}
}

static const struct iwl_tt_params iwl_mvm_default_tt_params = {
	.ct_kill_entry = 118,
	.ct_kill_exit = 96,
	.ct_kill_duration = 5,
	.dynamic_smps_entry = 114,
	.dynamic_smps_exit = 110,
	.tx_protection_entry = 114,
	.tx_protection_exit = 108,
	.tx_backoff = {
		{.temperature = 112, .backoff = 200},
		{.temperature = 113, .backoff = 600},
		{.temperature = 114, .backoff = 1200},
		{.temperature = 115, .backoff = 2000},
		{.temperature = 116, .backoff = 4000},
		{.temperature = 117, .backoff = 10000},
	},
	.support_ct_kill = true,
	.support_dynamic_smps = true,
	.support_tx_protection = true,
	.support_tx_backoff = true,
};

/* budget in mWatt */
static const u32 iwl_mvm_cdev_budgets[] = {
	2000,	/* cooling state 0 */
	1800,	/* cooling state 1 */
	1600,	/* cooling state 2 */
	1400,	/* cooling state 3 */
	1200,	/* cooling state 4 */
	1000,	/* cooling state 5 */
	900,	/* cooling state 6 */
	800,	/* cooling state 7 */
	700,	/* cooling state 8 */
	650,	/* cooling state 9 */
	600,	/* cooling state 10 */
	550,	/* cooling state 11 */
	500,	/* cooling state 12 */
	450,	/* cooling state 13 */
	400,	/* cooling state 14 */
	350,	/* cooling state 15 */
	300,	/* cooling state 16 */
	250,	/* cooling state 17 */
	200,	/* cooling state 18 */
	150,	/* cooling state 19 */
};

int iwl_mvm_ctdp_command(struct iwl_mvm *mvm, u32 op, u32 state)
{
	struct iwl_mvm_ctdp_cmd cmd = {
		.operation = cpu_to_le32(op),
		.budget = cpu_to_le32(iwl_mvm_cdev_budgets[state]),
		.window_size = 0,
	};
	int ret;
	u32 status;

	lockdep_assert_held(&mvm->mutex);

	ret = iwl_mvm_send_cmd_pdu_status(mvm, WIDE_ID(PHY_OPS_GROUP,
						       CTDP_CONFIG_CMD),
					  sizeof(cmd), &cmd, &status);

	if (ret) {
		IWL_ERR(mvm, "cTDP command failed (err=%d)\n", ret);
		return ret;
	}

	switch (op) {
	case CTDP_CMD_OPERATION_START:
#ifdef CONFIG_THERMAL
		mvm->cooling_dev.cur_state = state;
#endif /* CONFIG_THERMAL */
		break;
	case CTDP_CMD_OPERATION_REPORT:
		IWL_DEBUG_TEMP(mvm, "cTDP avg energy in mWatt = %d\n", status);
		/* when the function is called with CTDP_CMD_OPERATION_REPORT
		 * option the function should return the average budget value
		 * that is received from the FW.
		 * The budget can't be less or equal to 0, so it's possible
		 * to distinguish between error values and budgets.
		 */
		return status;
	case CTDP_CMD_OPERATION_STOP:
		IWL_DEBUG_TEMP(mvm, "cTDP stopped successfully\n");
		break;
	}

	return 0;
}

#ifdef CONFIG_THERMAL
static int compare_temps(const void *a, const void *b)
{
	return ((s16)le16_to_cpu(*(__le16 *)a) -
		(s16)le16_to_cpu(*(__le16 *)b));
}

int iwl_mvm_send_temp_report_ths_cmd(struct iwl_mvm *mvm)
{
	struct temp_report_ths_cmd cmd = {0};
	int ret, i, j, idx = 0;

	lockdep_assert_held(&mvm->mutex);

	if (!mvm->tz_device.tzone)
		return -EINVAL;

	/* The driver holds array of temperature trips that are unsorted
	 * and uncompressed, the FW should get it compressed and sorted
	 */

	/* compress temp_trips to cmd array, remove uninitialized values*/
	for (i = 0; i < IWL_MAX_DTS_TRIPS; i++) {
		if (mvm->tz_device.temp_trips[i] != S16_MIN) {
			cmd.thresholds[idx++] =
				cpu_to_le16(mvm->tz_device.temp_trips[i]);
		}
	}
	cmd.num_temps = cpu_to_le32(idx);

	if (!idx)
		goto send;

	/*sort cmd array*/
	sort(cmd.thresholds, idx, sizeof(s16), compare_temps, NULL);

	/* we should save the indexes of trips because we sort
	 * and compress the orginal array
	 */
	for (i = 0; i < idx; i++) {
		for (j = 0; j < IWL_MAX_DTS_TRIPS; j++) {
			if (le16_to_cpu(cmd.thresholds[i]) ==
				mvm->tz_device.temp_trips[j])
				mvm->tz_device.fw_trips_index[i] = j;
		}
	}

send:
	ret = iwl_mvm_send_cmd_pdu(mvm, WIDE_ID(PHY_OPS_GROUP,
						TEMP_REPORTING_THRESHOLDS_CMD),
				   0, sizeof(cmd), &cmd);
	if (ret)
		IWL_ERR(mvm, "TEMP_REPORT_THS_CMD command failed (err=%d)\n",
			ret);

	return ret;
}

static int iwl_mvm_tzone_get_temp(struct thermal_zone_device *device,
				  int *temperature)
{
	struct iwl_mvm *mvm = (struct iwl_mvm *)device->devdata;
	int ret;
	int temp;

	mutex_lock(&mvm->mutex);

	if (!mvm->ucode_loaded || !(mvm->cur_ucode == IWL_UCODE_REGULAR)) {
		ret = -EIO;
		goto out;
	}

	ret = iwl_mvm_get_temp(mvm, &temp);
	if (ret)
		goto out;

	*temperature = temp * 1000;

out:
	mutex_unlock(&mvm->mutex);
	return ret;
}

static int iwl_mvm_tzone_get_trip_temp(struct thermal_zone_device *device,
				       int trip, int *temp)
{
	struct iwl_mvm *mvm = (struct iwl_mvm *)device->devdata;

	if (trip < 0 || trip >= IWL_MAX_DTS_TRIPS)
		return -EINVAL;

	*temp = mvm->tz_device.temp_trips[trip] * 1000;

	return 0;
}

static int iwl_mvm_tzone_get_trip_type(struct thermal_zone_device *device,
				       int trip, enum thermal_trip_type *type)
{
	if (trip < 0 || trip >= IWL_MAX_DTS_TRIPS)
		return -EINVAL;

	*type = THERMAL_TRIP_PASSIVE;

	return 0;
}

static int iwl_mvm_tzone_set_trip_temp(struct thermal_zone_device *device,
				       int trip, int temp)
{
	struct iwl_mvm *mvm = (struct iwl_mvm *)device->devdata;
	struct iwl_mvm_thermal_device *tzone;
	int i, ret;
	s16 temperature;

	mutex_lock(&mvm->mutex);

	if (!mvm->ucode_loaded || !(mvm->cur_ucode == IWL_UCODE_REGULAR)) {
		ret = -EIO;
		goto out;
	}

	if (trip < 0 || trip >= IWL_MAX_DTS_TRIPS) {
		ret = -EINVAL;
		goto out;
	}

	if ((temp / 1000) > S16_MAX) {
		ret = -EINVAL;
		goto out;
	}

	temperature = (s16)(temp / 1000);
	tzone = &mvm->tz_device;

	if (!tzone) {
		ret = -EIO;
		goto out;
	}

	/* no updates*/
	if (tzone->temp_trips[trip] == temperature) {
		ret = 0;
		goto out;
	}

	/* already existing temperature */
	for (i = 0; i < IWL_MAX_DTS_TRIPS; i++) {
		if (tzone->temp_trips[i] == temperature) {
			ret = -EINVAL;
			goto out;
		}
	}

	tzone->temp_trips[trip] = temperature;

	ret = iwl_mvm_send_temp_report_ths_cmd(mvm);
out:
	mutex_unlock(&mvm->mutex);
	return ret;
}

static  struct thermal_zone_device_ops tzone_ops = {
	.get_temp = iwl_mvm_tzone_get_temp,
	.get_trip_temp = iwl_mvm_tzone_get_trip_temp,
	.get_trip_type = iwl_mvm_tzone_get_trip_type,
	.set_trip_temp = iwl_mvm_tzone_set_trip_temp,
};

/* make all trips writable */
#define IWL_WRITABLE_TRIPS_MSK (BIT(IWL_MAX_DTS_TRIPS) - 1)

static void iwl_mvm_thermal_zone_register(struct iwl_mvm *mvm)
{
	int i;
	char name[] = "iwlwifi";

	if (!iwl_mvm_is_tt_in_fw(mvm)) {
		mvm->tz_device.tzone = NULL;

		return;
	}

	BUILD_BUG_ON(ARRAY_SIZE(name) >= THERMAL_NAME_LENGTH);

	mvm->tz_device.tzone = thermal_zone_device_register(name,
							IWL_MAX_DTS_TRIPS,
							IWL_WRITABLE_TRIPS_MSK,
							mvm, &tzone_ops,
							NULL, 0, 0);
	if (IS_ERR(mvm->tz_device.tzone)) {
		IWL_DEBUG_TEMP(mvm,
			       "Failed to register to thermal zone (err = %ld)\n",
			       PTR_ERR(mvm->tz_device.tzone));
		mvm->tz_device.tzone = NULL;
		return;
	}

	/* 0 is a valid temperature,
	 * so initialize the array with S16_MIN which invalid temperature
	 */
	for (i = 0 ; i < IWL_MAX_DTS_TRIPS; i++)
		mvm->tz_device.temp_trips[i] = S16_MIN;
}

static int iwl_mvm_tcool_get_max_state(struct thermal_cooling_device *cdev,
				       unsigned long *state)
{
	*state = ARRAY_SIZE(iwl_mvm_cdev_budgets) - 1;

	return 0;
}

static int iwl_mvm_tcool_get_cur_state(struct thermal_cooling_device *cdev,
				       unsigned long *state)
{
	struct iwl_mvm *mvm = (struct iwl_mvm *)(cdev->devdata);

	*state = mvm->cooling_dev.cur_state;

	return 0;
}

static int iwl_mvm_tcool_set_cur_state(struct thermal_cooling_device *cdev,
				       unsigned long new_state)
{
	struct iwl_mvm *mvm = (struct iwl_mvm *)(cdev->devdata);
	int ret;

	if (!mvm->ucode_loaded || !(mvm->cur_ucode == IWL_UCODE_REGULAR))
		return -EIO;

	mutex_lock(&mvm->mutex);

	if (new_state >= ARRAY_SIZE(iwl_mvm_cdev_budgets)) {
		ret = -EINVAL;
		goto unlock;
	}

	ret = iwl_mvm_ctdp_command(mvm, CTDP_CMD_OPERATION_START,
				   new_state);

unlock:
	mutex_unlock(&mvm->mutex);
	return ret;
}

static struct thermal_cooling_device_ops tcooling_ops = {
	.get_max_state = iwl_mvm_tcool_get_max_state,
	.get_cur_state = iwl_mvm_tcool_get_cur_state,
	.set_cur_state = iwl_mvm_tcool_set_cur_state,
};

static void iwl_mvm_cooling_device_register(struct iwl_mvm *mvm)
{
	char name[] = "iwlwifi";

	if (!iwl_mvm_is_ctdp_supported(mvm))
		return;

	BUILD_BUG_ON(ARRAY_SIZE(name) >= THERMAL_NAME_LENGTH);

	mvm->cooling_dev.cdev =
		thermal_cooling_device_register(name,
						mvm,
						&tcooling_ops);

	if (IS_ERR(mvm->cooling_dev.cdev)) {
		IWL_DEBUG_TEMP(mvm,
			       "Failed to register to cooling device (err = %ld)\n",
			       PTR_ERR(mvm->cooling_dev.cdev));
		mvm->cooling_dev.cdev = NULL;
		return;
	}
}

static void iwl_mvm_thermal_zone_unregister(struct iwl_mvm *mvm)
{
	if (!iwl_mvm_is_tt_in_fw(mvm) || !mvm->tz_device.tzone)
		return;

	IWL_DEBUG_TEMP(mvm, "Thermal zone device unregister\n");
	if (mvm->tz_device.tzone) {
		thermal_zone_device_unregister(mvm->tz_device.tzone);
		mvm->tz_device.tzone = NULL;
	}
}

static void iwl_mvm_cooling_device_unregister(struct iwl_mvm *mvm)
{
	if (!iwl_mvm_is_ctdp_supported(mvm) || !mvm->cooling_dev.cdev)
		return;

	IWL_DEBUG_TEMP(mvm, "Cooling device unregister\n");
	if (mvm->cooling_dev.cdev) {
		thermal_cooling_device_unregister(mvm->cooling_dev.cdev);
		mvm->cooling_dev.cdev = NULL;
	}
}
#endif /* CONFIG_THERMAL */

void iwl_mvm_thermal_initialize(struct iwl_mvm *mvm, u32 min_backoff)
{
	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;

	IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");

	if (mvm->cfg->thermal_params)
		tt->params = *mvm->cfg->thermal_params;
	else
		tt->params = iwl_mvm_default_tt_params;

	tt->throttle = false;
	tt->dynamic_smps = false;
	tt->min_backoff = min_backoff;
	INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);

#ifdef CONFIG_THERMAL
	iwl_mvm_cooling_device_register(mvm);
	iwl_mvm_thermal_zone_register(mvm);
#endif
}

void iwl_mvm_thermal_exit(struct iwl_mvm *mvm)
{
	cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
	IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");

#ifdef CONFIG_THERMAL
	iwl_mvm_cooling_device_unregister(mvm);
	iwl_mvm_thermal_zone_unregister(mvm);
#endif
}