drivers/thermal/qcom-spmi-temp-alarm.c - kernel/msm-5.4 - Gitiles

 /*
  * Copyright (c) 2011-2015, 2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 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.
  */

 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/iio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/thermal.h>

 #include "thermal_core.h"

 #define QPNP_TM_REG_TYPE		0x04
 #define QPNP_TM_REG_SUBTYPE		0x05
 #define QPNP_TM_REG_STATUS		0x08
 #define QPNP_TM_REG_SHUTDOWN_CTRL1	0x40
 #define QPNP_TM_REG_ALARM_CTRL		0x46

 #define QPNP_TM_TYPE			0x09
 #define QPNP_TM_SUBTYPE_GEN1		0x08
 #define QPNP_TM_SUBTYPE_GEN2		0x09

 #define STATUS_GEN1_STAGE_MASK		GENMASK(1, 0)
 #define STATUS_GEN2_STATE_MASK		GENMASK(6, 4)
 #define STATUS_GEN2_STATE_SHIFT		4

 #define SHUTDOWN_CTRL1_OVERRIDE_S2	BIT(6)
 #define SHUTDOWN_CTRL1_THRESHOLD_MASK	GENMASK(1, 0)

 #define SHUTDOWN_CTRL1_RATE_25HZ	BIT(3)

 #define ALARM_CTRL_FORCE_ENABLE		BIT(7)

 /*
  * Trip point values based on threshold control
  * 0 = {105 C, 125 C, 145 C}
  * 1 = {110 C, 130 C, 150 C}
  * 2 = {115 C, 135 C, 155 C}
  * 3 = {120 C, 140 C, 160 C}
 */
 #define TEMP_STAGE_STEP			20000	/* Stage step: 20.000 C */
 #define TEMP_STAGE_HYSTERESIS		2000

 #define TEMP_THRESH_MIN			105000	/* Threshold Min: 105 C */
 #define TEMP_THRESH_STEP		5000	/* Threshold step: 5 C */

 #define THRESH_MIN			0
 #define THRESH_MAX			3

 /* Stage 2 Threshold Min: 125 C */
 #define STAGE2_THRESHOLD_MIN		125000
 /* Stage 2 Threshold Max: 140 C */
 #define STAGE2_THRESHOLD_MAX		140000

 /* Temperature in Milli Celsius reported during stage 0 if no ADC is present */
 #define DEFAULT_TEMP			37000

 struct qpnp_tm_chip {
 	struct regmap			*map;
 	struct device			*dev;
 	struct thermal_zone_device	*tz_dev;
 	unsigned int			subtype;
 	long				temp;
 	unsigned int			thresh;
 	unsigned int			stage;
 	unsigned int			prev_stage;
 	unsigned int			base;
 	/* protects .thresh, .stage and chip registers */
 	struct mutex			lock;
 	bool				initialized;

 	struct iio_channel		*adc;
 };

 /* This array maps from GEN2 alarm state to GEN1 alarm stage */
 static const unsigned int alarm_state_map[8] = {0, 1, 1, 2, 2, 3, 3, 3};

 static int qpnp_tm_read(struct qpnp_tm_chip *chip, u16 addr, u8 *data)
 {
 	unsigned int val;
 	int ret;

 	ret = regmap_read(chip->map, chip->base + addr, &val);
 	if (ret < 0)
 		return ret;

 	*data = val;
 	return 0;
 }

 static int qpnp_tm_write(struct qpnp_tm_chip *chip, u16 addr, u8 data)
 {
 	return regmap_write(chip->map, chip->base + addr, data);
 }

 /**
  * qpnp_tm_get_temp_stage() - return over-temperature stage
  * @chip:		Pointer to the qpnp_tm chip
  *
  * Return: stage (GEN1) or state (GEN2) on success, or errno on failure.
  */
 static int qpnp_tm_get_temp_stage(struct qpnp_tm_chip *chip)
 {
 	int ret;
 	u8 reg = 0;

 	ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, &reg);
 	if (ret < 0)
 		return ret;

 	if (chip->subtype == QPNP_TM_SUBTYPE_GEN1)
 		ret = reg & STATUS_GEN1_STAGE_MASK;
 	else
 		ret = (reg & STATUS_GEN2_STATE_MASK) >> STATUS_GEN2_STATE_SHIFT;

 	return ret;
 }

 /*
  * This function updates the internal temp value based on the
  * current thermal stage and threshold as well as the previous stage
  */
 static int qpnp_tm_update_temp_no_adc(struct qpnp_tm_chip *chip)
 {
 	unsigned int stage, stage_new, stage_old;
 	int ret;

 	WARN_ON(!mutex_is_locked(&chip->lock));

 	ret = qpnp_tm_get_temp_stage(chip);
 	if (ret < 0)
 		return ret;
 	stage = ret;

 	if (chip->subtype == QPNP_TM_SUBTYPE_GEN1) {
 		stage_new = stage;
 		stage_old = chip->stage;
 	} else {
 		stage_new = alarm_state_map[stage];
 		stage_old = alarm_state_map[chip->stage];
 	}

 	if (stage_new > stage_old) {
 		/* increasing stage, use lower bound */
 		chip->temp = (stage_new - 1) * TEMP_STAGE_STEP +
 			     chip->thresh * TEMP_THRESH_STEP +
 			     TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN;
 	} else if (stage_new < stage_old) {
 		/* decreasing stage, use upper bound */
 		chip->temp = stage_new * TEMP_STAGE_STEP +
 			     chip->thresh * TEMP_THRESH_STEP -
 			     TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN;
 	}

 	chip->stage = stage;

 	return 0;
 }

 static int qpnp_tm_get_temp(void *data, int *temp)
 {
 	struct qpnp_tm_chip *chip = data;
 	int ret, mili_celsius;

 	if (!temp)
 		return -EINVAL;

 	if (!chip->initialized) {
 		*temp = DEFAULT_TEMP;
 		return 0;
 	}

 	if (!chip->adc) {
 		mutex_lock(&chip->lock);
 		ret = qpnp_tm_update_temp_no_adc(chip);
 		mutex_unlock(&chip->lock);
 		if (ret < 0)
 			return ret;
 	} else {
 		ret = iio_read_channel_processed(chip->adc, &mili_celsius);
 		if (ret < 0)
 			return ret;

 		chip->temp = mili_celsius;
 	}

 	*temp = chip->temp < 0 ? 0 : chip->temp;

 	return 0;
 }

 static int qpnp_tm_update_critical_trip_temp(struct qpnp_tm_chip *chip,
 					     int temp)
 {
 	u8 reg;
 	bool disable_s2_shutdown = false;

 	WARN_ON(!mutex_is_locked(&chip->lock));

 	/*
 	 * Default: S2 and S3 shutdown enabled, thresholds at
 	 * 105C/125C/145C, monitoring at 25Hz
 	 */
 	reg = SHUTDOWN_CTRL1_RATE_25HZ;

 	if (temp == THERMAL_TEMP_INVALID ||
 	    temp < STAGE2_THRESHOLD_MIN) {
 		chip->thresh = THRESH_MIN;
 		goto skip;
 	}

 	if (temp <= STAGE2_THRESHOLD_MAX) {
 		chip->thresh = THRESH_MAX -
 			((STAGE2_THRESHOLD_MAX - temp) /
 			 TEMP_THRESH_STEP);
 		disable_s2_shutdown = true;
 	} else {
 		chip->thresh = THRESH_MAX;

 		if (chip->adc)
 			disable_s2_shutdown = true;
 		else
 			dev_warn(chip->dev,
 				 "No ADC is configured and critical temperature is above the maximum stage 2 threshold of 140 C! Configuring stage 2 shutdown at 140 C.\n");
 	}

 skip:
 	reg |= chip->thresh;
 	if (disable_s2_shutdown)
 		reg |= SHUTDOWN_CTRL1_OVERRIDE_S2;

 	return qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
 }

 static int qpnp_tm_set_trip_temp(void *data, int trip, int temp)
 {
 	struct qpnp_tm_chip *chip = data;
 	const struct thermal_trip *trip_points;
 	int ret;

 	trip_points = of_thermal_get_trip_points(chip->tz_dev);
 	if (!trip_points)
 		return -EINVAL;

 	if (trip_points[trip].type != THERMAL_TRIP_CRITICAL)
 		return 0;

 	mutex_lock(&chip->lock);
 	ret = qpnp_tm_update_critical_trip_temp(chip, temp);
 	mutex_unlock(&chip->lock);

 	return ret;
 }

 static const struct thermal_zone_of_device_ops qpnp_tm_sensor_ops = {
 	.get_temp = qpnp_tm_get_temp,
 	.set_trip_temp = qpnp_tm_set_trip_temp,
 };

 static irqreturn_t qpnp_tm_isr(int irq, void *data)
 {
 	struct qpnp_tm_chip *chip = data;

 	thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);

 	return IRQ_HANDLED;
 }

 static int qpnp_tm_get_critical_trip_temp(struct qpnp_tm_chip *chip)
 {
 	int ntrips;
 	const struct thermal_trip *trips;
 	int i;

 	ntrips = of_thermal_get_ntrips(chip->tz_dev);
 	if (ntrips <= 0)
 		return THERMAL_TEMP_INVALID;

 	trips = of_thermal_get_trip_points(chip->tz_dev);
 	if (!trips)
 		return THERMAL_TEMP_INVALID;

 	for (i = 0; i < ntrips; i++) {
 		if (of_thermal_is_trip_valid(chip->tz_dev, i) &&
 		    trips[i].type == THERMAL_TRIP_CRITICAL)
 			return trips[i].temperature;
 	}

 	return THERMAL_TEMP_INVALID;
 }

 /*
  * This function initializes the internal temp value based on only the
  * current thermal stage and threshold. Setup threshold control and
  * disable shutdown override.
  */
 static int qpnp_tm_init(struct qpnp_tm_chip *chip)
 {
 	unsigned int stage;
 	int ret;
 	u8 reg = 0;
 	int crit_temp;

 	mutex_lock(&chip->lock);

 	ret = qpnp_tm_read(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, &reg);
 	if (ret < 0)
 		goto out;

 	chip->thresh = reg & SHUTDOWN_CTRL1_THRESHOLD_MASK;
 	chip->temp = DEFAULT_TEMP;

 	ret = qpnp_tm_get_temp_stage(chip);
 	if (ret < 0)
 		goto out;
 	chip->stage = ret;

 	stage = chip->subtype == QPNP_TM_SUBTYPE_GEN1
 		? chip->stage : alarm_state_map[chip->stage];

 	if (stage)
 		chip->temp = chip->thresh * TEMP_THRESH_STEP +
 			     (stage - 1) * TEMP_STAGE_STEP +
 			     TEMP_THRESH_MIN;

 	crit_temp = qpnp_tm_get_critical_trip_temp(chip);
 	ret = qpnp_tm_update_critical_trip_temp(chip, crit_temp);
 	if (ret < 0)
 		goto out;

 	/* Enable the thermal alarm PMIC module in always-on mode. */
 	reg = ALARM_CTRL_FORCE_ENABLE;
 	ret = qpnp_tm_write(chip, QPNP_TM_REG_ALARM_CTRL, reg);

 	chip->initialized = true;

 out:
 	mutex_unlock(&chip->lock);
 	return ret;
 }

 static int qpnp_tm_probe(struct platform_device *pdev)
 {
 	struct qpnp_tm_chip *chip;
 	struct device_node *node;
 	u8 type, subtype;
 	u32 res;
 	int ret, irq;

 	node = pdev->dev.of_node;

 	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	dev_set_drvdata(&pdev->dev, chip);
 	chip->dev = &pdev->dev;

 	mutex_init(&chip->lock);

 	chip->map = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!chip->map)
 		return -ENXIO;

 	ret = of_property_read_u32(node, "reg", &res);
 	if (ret < 0)
 		return ret;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

 	/* ADC based measurements are optional */
 	chip->adc = devm_iio_channel_get(&pdev->dev, "thermal");
 	if (IS_ERR(chip->adc)) {
 		ret = PTR_ERR(chip->adc);
 		chip->adc = NULL;
 		if (ret == -EPROBE_DEFER)
 			return ret;
 	}

 	chip->base = res;

 	ret = qpnp_tm_read(chip, QPNP_TM_REG_TYPE, &type);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "could not read type\n");
 		return ret;
 	}

 	ret = qpnp_tm_read(chip, QPNP_TM_REG_SUBTYPE, &subtype);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "could not read subtype\n");
 		return ret;
 	}

 	if (type != QPNP_TM_TYPE || (subtype != QPNP_TM_SUBTYPE_GEN1
 				     && subtype != QPNP_TM_SUBTYPE_GEN2)) {
 		dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n",
 			type, subtype);
 		return -ENODEV;
 	}

 	chip->subtype = subtype;

 	/*
 	 * Register the sensor before initializing the hardware to be able to
 	 * read the trip points. get_temp() returns the default temperature
 	 * before the hardware initialization is completed.
 	 */
 	chip->tz_dev = devm_thermal_zone_of_sensor_register(
 		&pdev->dev, 0, chip, &qpnp_tm_sensor_ops);
 	if (IS_ERR(chip->tz_dev)) {
 		dev_err(&pdev->dev, "failed to register sensor\n");
 		return PTR_ERR(chip->tz_dev);
 	}

 	ret = qpnp_tm_init(chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "init failed\n");
 		return ret;
 	}

 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, qpnp_tm_isr,
 					IRQF_ONESHOT, node->name, chip);
 	if (ret < 0)
 		return ret;

 	thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);

 	return 0;
 }

 static const struct of_device_id qpnp_tm_match_table[] = {
 	{ .compatible = "qcom,spmi-temp-alarm" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, qpnp_tm_match_table);

 static struct platform_driver qpnp_tm_driver = {
 	.driver = {
 		.name = "spmi-temp-alarm",
 		.of_match_table = qpnp_tm_match_table,
 	},
 	.probe  = qpnp_tm_probe,
 };
 module_platform_driver(qpnp_tm_driver);

 MODULE_ALIAS("platform:spmi-temp-alarm");
 MODULE_DESCRIPTION("QPNP PMIC Temperature Alarm driver");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (c) 2011-2015, 2017, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 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.
	*/

	#include <linux/bitops.h>
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/iio/consumer.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/thermal.h>

	#include "thermal_core.h"

	#define QPNP_TM_REG_TYPE 0x04
	#define QPNP_TM_REG_SUBTYPE 0x05
	#define QPNP_TM_REG_STATUS 0x08
	#define QPNP_TM_REG_SHUTDOWN_CTRL1 0x40
	#define QPNP_TM_REG_ALARM_CTRL 0x46

	#define QPNP_TM_TYPE 0x09
	#define QPNP_TM_SUBTYPE_GEN1 0x08
	#define QPNP_TM_SUBTYPE_GEN2 0x09

	#define STATUS_GEN1_STAGE_MASK GENMASK(1, 0)
	#define STATUS_GEN2_STATE_MASK GENMASK(6, 4)
	#define STATUS_GEN2_STATE_SHIFT 4

	#define SHUTDOWN_CTRL1_OVERRIDE_S2 BIT(6)
	#define SHUTDOWN_CTRL1_THRESHOLD_MASK GENMASK(1, 0)

	#define SHUTDOWN_CTRL1_RATE_25HZ BIT(3)

	#define ALARM_CTRL_FORCE_ENABLE BIT(7)

	/*
	* Trip point values based on threshold control
	* 0 = {105 C, 125 C, 145 C}
	* 1 = {110 C, 130 C, 150 C}
	* 2 = {115 C, 135 C, 155 C}
	* 3 = {120 C, 140 C, 160 C}
	*/
	#define TEMP_STAGE_STEP 20000 /* Stage step: 20.000 C */
	#define TEMP_STAGE_HYSTERESIS 2000

	#define TEMP_THRESH_MIN 105000 /* Threshold Min: 105 C */
	#define TEMP_THRESH_STEP 5000 /* Threshold step: 5 C */

	#define THRESH_MIN 0
	#define THRESH_MAX 3

	/* Stage 2 Threshold Min: 125 C */
	#define STAGE2_THRESHOLD_MIN 125000
	/* Stage 2 Threshold Max: 140 C */
	#define STAGE2_THRESHOLD_MAX 140000

	/* Temperature in Milli Celsius reported during stage 0 if no ADC is present */
	#define DEFAULT_TEMP 37000

	struct qpnp_tm_chip {
	struct regmap *map;
	struct device *dev;
	struct thermal_zone_device *tz_dev;
	unsigned int subtype;
	long temp;
	unsigned int thresh;
	unsigned int stage;
	unsigned int prev_stage;
	unsigned int base;
	/* protects .thresh, .stage and chip registers */
	struct mutex lock;
	bool initialized;

	struct iio_channel *adc;
	};

	/* This array maps from GEN2 alarm state to GEN1 alarm stage */
	static const unsigned int alarm_state_map[8] = {0, 1, 1, 2, 2, 3, 3, 3};

	static int qpnp_tm_read(struct qpnp_tm_chip chip, u16 addr, u8 data)
	{
	unsigned int val;
	int ret;

	ret = regmap_read(chip->map, chip->base + addr, &val);
	if (ret < 0)
	return ret;

	*data = val;
	return 0;
	}

	static int qpnp_tm_write(struct qpnp_tm_chip *chip, u16 addr, u8 data)
	{
	return regmap_write(chip->map, chip->base + addr, data);
	}

	/**
	* qpnp_tm_get_temp_stage() - return over-temperature stage
	* @chip: Pointer to the qpnp_tm chip
	*
	* Return: stage (GEN1) or state (GEN2) on success, or errno on failure.
	*/
	static int qpnp_tm_get_temp_stage(struct qpnp_tm_chip *chip)
	{
	int ret;
	u8 reg = 0;

	ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, &reg);
	if (ret < 0)
	return ret;

	if (chip->subtype == QPNP_TM_SUBTYPE_GEN1)
	ret = reg & STATUS_GEN1_STAGE_MASK;
	else
	ret = (reg & STATUS_GEN2_STATE_MASK) >> STATUS_GEN2_STATE_SHIFT;

	return ret;
	}

	/*
	* This function updates the internal temp value based on the
	* current thermal stage and threshold as well as the previous stage
	*/
	static int qpnp_tm_update_temp_no_adc(struct qpnp_tm_chip *chip)
	{
	unsigned int stage, stage_new, stage_old;
	int ret;

	WARN_ON(!mutex_is_locked(&chip->lock));

	ret = qpnp_tm_get_temp_stage(chip);
	if (ret < 0)
	return ret;
	stage = ret;

	if (chip->subtype == QPNP_TM_SUBTYPE_GEN1) {
	stage_new = stage;
	stage_old = chip->stage;
	} else {
	stage_new = alarm_state_map[stage];
	stage_old = alarm_state_map[chip->stage];
	}

	if (stage_new > stage_old) {
	/* increasing stage, use lower bound */
	chip->temp = (stage_new - 1) * TEMP_STAGE_STEP +
	chip->thresh * TEMP_THRESH_STEP +
	TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN;
	} else if (stage_new < stage_old) {
	/* decreasing stage, use upper bound */
	chip->temp = stage_new * TEMP_STAGE_STEP +
	chip->thresh * TEMP_THRESH_STEP -
	TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN;
	}

	chip->stage = stage;

	return 0;
	}

	static int qpnp_tm_get_temp(void data, int temp)
	{
	struct qpnp_tm_chip *chip = data;
	int ret, mili_celsius;

	if (!temp)
	return -EINVAL;

	if (!chip->initialized) {
	*temp = DEFAULT_TEMP;
	return 0;
	}

	if (!chip->adc) {
	mutex_lock(&chip->lock);
	ret = qpnp_tm_update_temp_no_adc(chip);
	mutex_unlock(&chip->lock);
	if (ret < 0)
	return ret;
	} else {
	ret = iio_read_channel_processed(chip->adc, &mili_celsius);
	if (ret < 0)
	return ret;

	chip->temp = mili_celsius;
	}

	*temp = chip->temp < 0 ? 0 : chip->temp;

	return 0;
	}

	static int qpnp_tm_update_critical_trip_temp(struct qpnp_tm_chip *chip,
	int temp)
	{
	u8 reg;
	bool disable_s2_shutdown = false;

	WARN_ON(!mutex_is_locked(&chip->lock));

	/*
	* Default: S2 and S3 shutdown enabled, thresholds at
	* 105C/125C/145C, monitoring at 25Hz
	*/
	reg = SHUTDOWN_CTRL1_RATE_25HZ;

	if (temp == THERMAL_TEMP_INVALID \|\|
	temp < STAGE2_THRESHOLD_MIN) {
	chip->thresh = THRESH_MIN;
	goto skip;
	}

	if (temp <= STAGE2_THRESHOLD_MAX) {
	chip->thresh = THRESH_MAX -
	((STAGE2_THRESHOLD_MAX - temp) /
	TEMP_THRESH_STEP);
	disable_s2_shutdown = true;
	} else {
	chip->thresh = THRESH_MAX;

	if (chip->adc)
	disable_s2_shutdown = true;
	else
	dev_warn(chip->dev,
	"No ADC is configured and critical temperature is above the maximum stage 2 threshold of 140 C! Configuring stage 2 shutdown at 140 C.\n");
	}

	skip:
	reg \|= chip->thresh;
	if (disable_s2_shutdown)
	reg \|= SHUTDOWN_CTRL1_OVERRIDE_S2;

	return qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
	}

	static int qpnp_tm_set_trip_temp(void *data, int trip, int temp)
	{
	struct qpnp_tm_chip *chip = data;
	const struct thermal_trip *trip_points;
	int ret;

	trip_points = of_thermal_get_trip_points(chip->tz_dev);
	if (!trip_points)
	return -EINVAL;

	if (trip_points[trip].type != THERMAL_TRIP_CRITICAL)
	return 0;

	mutex_lock(&chip->lock);
	ret = qpnp_tm_update_critical_trip_temp(chip, temp);
	mutex_unlock(&chip->lock);

	return ret;
	}

	static const struct thermal_zone_of_device_ops qpnp_tm_sensor_ops = {
	.get_temp = qpnp_tm_get_temp,
	.set_trip_temp = qpnp_tm_set_trip_temp,
	};

	static irqreturn_t qpnp_tm_isr(int irq, void *data)
	{
	struct qpnp_tm_chip *chip = data;

	thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);

	return IRQ_HANDLED;
	}

	static int qpnp_tm_get_critical_trip_temp(struct qpnp_tm_chip *chip)
	{
	int ntrips;
	const struct thermal_trip *trips;
	int i;

	ntrips = of_thermal_get_ntrips(chip->tz_dev);
	if (ntrips <= 0)
	return THERMAL_TEMP_INVALID;

	trips = of_thermal_get_trip_points(chip->tz_dev);
	if (!trips)
	return THERMAL_TEMP_INVALID;

	for (i = 0; i < ntrips; i++) {
	if (of_thermal_is_trip_valid(chip->tz_dev, i) &&
	trips[i].type == THERMAL_TRIP_CRITICAL)
	return trips[i].temperature;
	}

	return THERMAL_TEMP_INVALID;
	}

	/*
	* This function initializes the internal temp value based on only the
	* current thermal stage and threshold. Setup threshold control and
	* disable shutdown override.
	*/
	static int qpnp_tm_init(struct qpnp_tm_chip *chip)
	{
	unsigned int stage;
	int ret;
	u8 reg = 0;
	int crit_temp;

	mutex_lock(&chip->lock);

	ret = qpnp_tm_read(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, &reg);
	if (ret < 0)
	goto out;

	chip->thresh = reg & SHUTDOWN_CTRL1_THRESHOLD_MASK;
	chip->temp = DEFAULT_TEMP;

	ret = qpnp_tm_get_temp_stage(chip);
	if (ret < 0)
	goto out;
	chip->stage = ret;

	stage = chip->subtype == QPNP_TM_SUBTYPE_GEN1
	? chip->stage : alarm_state_map[chip->stage];

	if (stage)
	chip->temp = chip->thresh * TEMP_THRESH_STEP +
	(stage - 1) * TEMP_STAGE_STEP +
	TEMP_THRESH_MIN;

	crit_temp = qpnp_tm_get_critical_trip_temp(chip);
	ret = qpnp_tm_update_critical_trip_temp(chip, crit_temp);
	if (ret < 0)
	goto out;

	/* Enable the thermal alarm PMIC module in always-on mode. */
	reg = ALARM_CTRL_FORCE_ENABLE;
	ret = qpnp_tm_write(chip, QPNP_TM_REG_ALARM_CTRL, reg);

	chip->initialized = true;

	out:
	mutex_unlock(&chip->lock);
	return ret;
	}

	static int qpnp_tm_probe(struct platform_device *pdev)
	{
	struct qpnp_tm_chip *chip;
	struct device_node *node;
	u8 type, subtype;
	u32 res;
	int ret, irq;

	node = pdev->dev.of_node;

	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	dev_set_drvdata(&pdev->dev, chip);
	chip->dev = &pdev->dev;

	mutex_init(&chip->lock);

	chip->map = dev_get_regmap(pdev->dev.parent, NULL);
	if (!chip->map)
	return -ENXIO;

	ret = of_property_read_u32(node, "reg", &res);
	if (ret < 0)
	return ret;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	/* ADC based measurements are optional */
	chip->adc = devm_iio_channel_get(&pdev->dev, "thermal");
	if (IS_ERR(chip->adc)) {
	ret = PTR_ERR(chip->adc);
	chip->adc = NULL;
	if (ret == -EPROBE_DEFER)
	return ret;
	}

	chip->base = res;

	ret = qpnp_tm_read(chip, QPNP_TM_REG_TYPE, &type);
	if (ret < 0) {
	dev_err(&pdev->dev, "could not read type\n");
	return ret;
	}

	ret = qpnp_tm_read(chip, QPNP_TM_REG_SUBTYPE, &subtype);
	if (ret < 0) {
	dev_err(&pdev->dev, "could not read subtype\n");
	return ret;
	}

	if (type != QPNP_TM_TYPE \|\| (subtype != QPNP_TM_SUBTYPE_GEN1
	&& subtype != QPNP_TM_SUBTYPE_GEN2)) {
	dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n",
	type, subtype);
	return -ENODEV;
	}

	chip->subtype = subtype;

	/*
	* Register the sensor before initializing the hardware to be able to
	* read the trip points. get_temp() returns the default temperature
	* before the hardware initialization is completed.
	*/
	chip->tz_dev = devm_thermal_zone_of_sensor_register(
	&pdev->dev, 0, chip, &qpnp_tm_sensor_ops);
	if (IS_ERR(chip->tz_dev)) {
	dev_err(&pdev->dev, "failed to register sensor\n");
	return PTR_ERR(chip->tz_dev);
	}

	ret = qpnp_tm_init(chip);
	if (ret < 0) {
	dev_err(&pdev->dev, "init failed\n");
	return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, qpnp_tm_isr,
	IRQF_ONESHOT, node->name, chip);
	if (ret < 0)
	return ret;

	thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);

	return 0;
	}

	static const struct of_device_id qpnp_tm_match_table[] = {
	{ .compatible = "qcom,spmi-temp-alarm" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, qpnp_tm_match_table);

	static struct platform_driver qpnp_tm_driver = {
	.driver = {
	.name = "spmi-temp-alarm",
	.of_match_table = qpnp_tm_match_table,
	},
	.probe = qpnp_tm_probe,
	};
	module_platform_driver(qpnp_tm_driver);

	MODULE_ALIAS("platform:spmi-temp-alarm");
	MODULE_DESCRIPTION("QPNP PMIC Temperature Alarm driver");
	MODULE_LICENSE("GPL v2");