drivers/thermal/brcmstb_thermal.c - kernel/lockdown - Git at Google

 /*
  * Broadcom STB AVS TMON thermal sensor driver
  *
  * Copyright (C) 2015 Broadcom Corporation
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * 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.
  *
  */

 #define DRV_NAME	"brcmstb_thermal"

 #define pr_fmt(fmt)	DRV_NAME ": " fmt

 #include <linux/bitops.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/irqreturn.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/of_device.h>
 #include <linux/thermal.h>

 #define AVS_TMON_STATUS			0x00
  #define AVS_TMON_STATUS_valid_msk	BIT(11)
  #define AVS_TMON_STATUS_data_msk	GENMASK(10, 1)
  #define AVS_TMON_STATUS_data_shift	1

 #define AVS_TMON_EN_OVERTEMP_RESET	0x04
  #define AVS_TMON_EN_OVERTEMP_RESET_msk	BIT(0)

 #define AVS_TMON_RESET_THRESH		0x08
  #define AVS_TMON_RESET_THRESH_msk	GENMASK(10, 1)
  #define AVS_TMON_RESET_THRESH_shift	1

 #define AVS_TMON_INT_IDLE_TIME		0x10

 #define AVS_TMON_EN_TEMP_INT_SRCS	0x14
  #define AVS_TMON_EN_TEMP_INT_SRCS_high	BIT(1)
  #define AVS_TMON_EN_TEMP_INT_SRCS_low	BIT(0)

 #define AVS_TMON_INT_THRESH		0x18
  #define AVS_TMON_INT_THRESH_high_msk	GENMASK(26, 17)
  #define AVS_TMON_INT_THRESH_high_shift	17
  #define AVS_TMON_INT_THRESH_low_msk	GENMASK(10, 1)
  #define AVS_TMON_INT_THRESH_low_shift	1

 #define AVS_TMON_TEMP_INT_CODE		0x1c
 #define AVS_TMON_TP_TEST_ENABLE		0x20

 enum avs_tmon_trip_type {
 	TMON_TRIP_TYPE_LOW = 0,
 	TMON_TRIP_TYPE_HIGH,
 	TMON_TRIP_TYPE_RESET,
 	TMON_TRIP_TYPE_MAX,
 };

 struct avs_tmon_trip {
 	/* HW bit to enable the trip */
 	u32 enable_offs;
 	u32 enable_mask;

 	/* HW field to read the trip temperature */
 	u32 reg_offs;
 	u32 reg_msk;
 	int reg_shift;
 };

 static struct avs_tmon_trip avs_tmon_trips[] = {
 	/* Trips when temperature is below threshold */
 	[TMON_TRIP_TYPE_LOW] = {
 		.enable_offs	= AVS_TMON_EN_TEMP_INT_SRCS,
 		.enable_mask	= AVS_TMON_EN_TEMP_INT_SRCS_low,
 		.reg_offs	= AVS_TMON_INT_THRESH,
 		.reg_msk	= AVS_TMON_INT_THRESH_low_msk,
 		.reg_shift	= AVS_TMON_INT_THRESH_low_shift,
 	},
 	/* Trips when temperature is above threshold */
 	[TMON_TRIP_TYPE_HIGH] = {
 		.enable_offs	= AVS_TMON_EN_TEMP_INT_SRCS,
 		.enable_mask	= AVS_TMON_EN_TEMP_INT_SRCS_high,
 		.reg_offs	= AVS_TMON_INT_THRESH,
 		.reg_msk	= AVS_TMON_INT_THRESH_high_msk,
 		.reg_shift	= AVS_TMON_INT_THRESH_high_shift,
 	},
 	/* Automatically resets chip when above threshold */
 	[TMON_TRIP_TYPE_RESET] = {
 		.enable_offs	= AVS_TMON_EN_OVERTEMP_RESET,
 		.enable_mask	= AVS_TMON_EN_OVERTEMP_RESET_msk,
 		.reg_offs	= AVS_TMON_RESET_THRESH,
 		.reg_msk	= AVS_TMON_RESET_THRESH_msk,
 		.reg_shift	= AVS_TMON_RESET_THRESH_shift,
 	},
 };

 enum {
 	/*
 	 * Using the of-thermal framework
 	 */
 	AVS_TMON_OF_SENSOR_DRIVER,

 	/*
 	 * Old DT bindings didn't include the of-sensor framework, so support a
 	 * full zone implementation temporarily
 	 */
 	AVS_TMON_ZONE_DRIVER,
 };

 struct brcmstb_thermal_priv {
 	void __iomem *tmon_base;
 	struct thermal_zone_device *thermal;

 	/* Did this driver register as a sensor or as a zone? */
 	int regtype;
 };

 /* Convert a HW code to a temperature reading (millidegree celsius) */
 static inline int avs_tmon_code_to_temp(u32 code)
 {
 	return (4100400U - code * 4870U) / 10U;
 }

 /*
  * Convert a temperature value (millidegree celsius) to a HW code
  *
  * @temp: temperature to convert
  * @low: if true, round toward the low side
  */
 static inline u32 avs_tmon_temp_to_code(unsigned long temp, bool low)
 {
 	if (low)
 		return DIV_ROUND_UP(4100400U - temp * 10U, 4870U);
 	else
 		return (4100400U - temp * 10U) / 4870U;
 }

 static int brcmstb_get_temp(void *data, long *temp)
 {
 	struct brcmstb_thermal_priv *priv = data;
 	u32 val;

 	val = __raw_readl(priv->tmon_base + AVS_TMON_STATUS);

 	if (!(val & AVS_TMON_STATUS_valid_msk)) {
 		dev_err(&priv->thermal->device, "reading not valid\n");
 		return -EIO;
 	}

 	val = (val & AVS_TMON_STATUS_data_msk) >> AVS_TMON_STATUS_data_shift;

 	*temp = avs_tmon_code_to_temp(val);

 	return 0;
 }

 /*
  * Active when the of-thermal framework is not used
  */
 static int brcmstb_get_zone_temp(struct thermal_zone_device *thermal,
 				 unsigned long *temp)
 {
 	return brcmstb_get_temp(thermal->devdata, temp);
 }

 static void avs_tmon_trip_enable(struct brcmstb_thermal_priv *priv,
 				 enum avs_tmon_trip_type type, int en)
 {
 	struct avs_tmon_trip *trip = &avs_tmon_trips[type];
 	u32 val = __raw_readl(priv->tmon_base + trip->enable_offs);

 	pr_debug("%s trip, type %d\n", en ? "enable" : "disable", type);

 	if (en)
 		val |= trip->enable_mask;
 	else
 		val &= ~trip->enable_mask;

 	__raw_writel(val, priv->tmon_base + trip->enable_offs);
 }

 static int avs_tmon_get_trip_temp(struct brcmstb_thermal_priv *priv,
 				  enum avs_tmon_trip_type type)
 {
 	struct avs_tmon_trip *trip = &avs_tmon_trips[type];
 	u32 val = __raw_readl(priv->tmon_base + trip->reg_offs);

 	val &= trip->reg_msk;
 	val >>= trip->reg_shift;

 	return avs_tmon_code_to_temp(val);
 }

 static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
 				   enum avs_tmon_trip_type type,
 				   unsigned long temp)
 {
 	struct avs_tmon_trip *trip = &avs_tmon_trips[type];
 	u32 val, orig;

 	pr_debug("set temp %d to %lu\n", type, temp);

 	/* round toward low temp for the low interrupt */
 	val = avs_tmon_temp_to_code(temp, type == TMON_TRIP_TYPE_LOW);

 	/* TODO: Check for overflow? */
 	val <<= trip->reg_shift;
 	val &= trip->reg_msk;

 	orig = __raw_readl(priv->tmon_base + trip->reg_offs);
 	orig &= ~trip->reg_msk;
 	orig |= val;
 	__raw_writel(orig, priv->tmon_base + trip->reg_offs);
 }

 static int avs_tmon_get_intr_temp(struct brcmstb_thermal_priv *priv)
 {
 	u32 val;

 	val = __raw_readl(priv->tmon_base + AVS_TMON_TEMP_INT_CODE);
 	return avs_tmon_code_to_temp(val);
 }

 static irqreturn_t brcmstb_tmon_irq_thread(int irq, void *data)
 {
 	struct brcmstb_thermal_priv *priv = data;
 	unsigned long low, high, intr;

 	low = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_LOW);
 	high = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_HIGH);
 	intr = avs_tmon_get_intr_temp(priv);

 	dev_dbg(&priv->thermal->device, "low/intr/high: %lu/%lu/%lu\n",
 			low, intr, high);

 	/* Disable high-temp until next threshold shift */
 	if (intr >= high)
 		avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
 	/* Disable low-temp until next threshold shift */
 	if (intr <= low)
 		avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);

 	/*
 	 * Notify using the interrupt temperature, in case the temperature
 	 * changes before it can next be read out
 	 */
 	thermal_zone_device_update_temp(priv->thermal, intr);

 	return IRQ_HANDLED;
 }

 static int brcmstb_set_trips(void *data, unsigned long low, unsigned long high)
 {
 	struct brcmstb_thermal_priv *priv = data;

 	pr_debug("set trips %lu <--> %lu\n", low, high);

 	if (low) {
 		avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_LOW, low);
 		avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 1);
 	} else {
 		avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);
 	}

 	if (high < ULONG_MAX) {
 		avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_HIGH, high);
 		avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 1);
 	} else {
 		avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
 	}

 	return 0;
 }

 static struct thermal_zone_device_ops zone_ops = {
 	.get_temp	= brcmstb_get_zone_temp,
 };

 static struct thermal_zone_of_device_ops of_ops = {
 	.get_temp	= brcmstb_get_temp,
 	.set_trips	= brcmstb_set_trips,
 };

 static const struct of_device_id brcmstb_thermal_id_table[] = {
 	{ .compatible = "brcm,avs-tmon" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, brcmstb_thermal_id_table);

 /*
  * Deprecated: we should be using the of-thermal framework, rather than
  * registering our own thermal zone. This is provided as a temporary help, in
  * case of an old device tree which does not include the thermal-zones node and
  * sensor phandles.
  */
 static int brcmstb_thermal_zone_probe(struct platform_device *pdev,
 				      struct brcmstb_thermal_priv *priv)
 {
 	priv->thermal = thermal_zone_device_register("avs_tmon", 0, 0, priv,
 						     &zone_ops, NULL, 0, 0);
 	if (IS_ERR(priv->thermal)) {
 		dev_err(&pdev->dev, "failed to register zone device\n");
 		return PTR_ERR(priv->thermal);
 	}

 	priv->regtype = AVS_TMON_ZONE_DRIVER;
 	dev_info(&pdev->dev, "registered AVS TMON zone driver\n");

 	return 0;
 }

 static int brcmstb_thermal_probe(struct platform_device *pdev)
 {
 	struct thermal_zone_device *thermal;
 	struct brcmstb_thermal_priv *priv;
 	struct resource *res;
 	int irq, ret;

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

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	priv->tmon_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(priv->tmon_base))
 		return PTR_ERR(priv->tmon_base);

 	platform_set_drvdata(pdev, priv);

 	thermal = thermal_zone_of_sensor_register(&pdev->dev, 0, priv, &of_ops);
 	if (IS_ERR(thermal))
 		/*
 		 * Fall back to registering our own zone, for legacy purposes
 		 */
 		return brcmstb_thermal_zone_probe(pdev, priv);
 	priv->thermal = thermal;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "could not get IRQ\n");
 		ret = irq;
 		goto err;
 	}
 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 					brcmstb_tmon_irq_thread, IRQF_ONESHOT,
 					DRV_NAME, priv);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "could not request IRQ: %d\n", ret);
 		goto err;
 	}

 	priv->regtype = AVS_TMON_OF_SENSOR_DRIVER;
 	dev_info(&pdev->dev, "registered AVS TMON of-sensor driver\n");

 	return 0;

 err:
 	thermal_zone_device_unregister(thermal);
 	return ret;
 }

 static int brcmstb_thermal_exit(struct platform_device *pdev)
 {
 	struct brcmstb_thermal_priv *priv = platform_get_drvdata(pdev);
 	struct thermal_zone_device *thermal = priv->thermal;

 	if (priv->regtype == AVS_TMON_ZONE_DRIVER)
 		thermal_zone_device_unregister(thermal);
 	else
 		thermal_zone_of_sensor_unregister(&pdev->dev, priv->thermal);

 	return 0;
 }

 static struct platform_driver brcmstb_thermal_driver = {
 	.probe = brcmstb_thermal_probe,
 	.remove = brcmstb_thermal_exit,
 	.driver = {
 		.name = DRV_NAME,
 		.owner = THIS_MODULE,
 		.of_match_table = brcmstb_thermal_id_table,
 	},
 };
 module_platform_driver(brcmstb_thermal_driver);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Brian Norris");
 MODULE_DESCRIPTION("Broadcom STB AVS TMON thermal driver");
	/*
	* Broadcom STB AVS TMON thermal sensor driver
	*
	* Copyright (C) 2015 Broadcom Corporation
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* 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.
	*
	*/

	#define DRV_NAME "brcmstb_thermal"

	#define pr_fmt(fmt) DRV_NAME ": " fmt

	#include <linux/bitops.h>
	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/irqreturn.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/of_device.h>
	#include <linux/thermal.h>

	#define AVS_TMON_STATUS 0x00
	#define AVS_TMON_STATUS_valid_msk BIT(11)
	#define AVS_TMON_STATUS_data_msk GENMASK(10, 1)
	#define AVS_TMON_STATUS_data_shift 1

	#define AVS_TMON_EN_OVERTEMP_RESET 0x04
	#define AVS_TMON_EN_OVERTEMP_RESET_msk BIT(0)

	#define AVS_TMON_RESET_THRESH 0x08
	#define AVS_TMON_RESET_THRESH_msk GENMASK(10, 1)
	#define AVS_TMON_RESET_THRESH_shift 1

	#define AVS_TMON_INT_IDLE_TIME 0x10

	#define AVS_TMON_EN_TEMP_INT_SRCS 0x14
	#define AVS_TMON_EN_TEMP_INT_SRCS_high BIT(1)
	#define AVS_TMON_EN_TEMP_INT_SRCS_low BIT(0)

	#define AVS_TMON_INT_THRESH 0x18
	#define AVS_TMON_INT_THRESH_high_msk GENMASK(26, 17)
	#define AVS_TMON_INT_THRESH_high_shift 17
	#define AVS_TMON_INT_THRESH_low_msk GENMASK(10, 1)
	#define AVS_TMON_INT_THRESH_low_shift 1

	#define AVS_TMON_TEMP_INT_CODE 0x1c
	#define AVS_TMON_TP_TEST_ENABLE 0x20

	enum avs_tmon_trip_type {
	TMON_TRIP_TYPE_LOW = 0,
	TMON_TRIP_TYPE_HIGH,
	TMON_TRIP_TYPE_RESET,
	TMON_TRIP_TYPE_MAX,
	};

	struct avs_tmon_trip {
	/* HW bit to enable the trip */
	u32 enable_offs;
	u32 enable_mask;

	/* HW field to read the trip temperature */
	u32 reg_offs;
	u32 reg_msk;
	int reg_shift;
	};

	static struct avs_tmon_trip avs_tmon_trips[] = {
	/* Trips when temperature is below threshold */
	[TMON_TRIP_TYPE_LOW] = {
	.enable_offs = AVS_TMON_EN_TEMP_INT_SRCS,
	.enable_mask = AVS_TMON_EN_TEMP_INT_SRCS_low,
	.reg_offs = AVS_TMON_INT_THRESH,
	.reg_msk = AVS_TMON_INT_THRESH_low_msk,
	.reg_shift = AVS_TMON_INT_THRESH_low_shift,
	},
	/* Trips when temperature is above threshold */
	[TMON_TRIP_TYPE_HIGH] = {
	.enable_offs = AVS_TMON_EN_TEMP_INT_SRCS,
	.enable_mask = AVS_TMON_EN_TEMP_INT_SRCS_high,
	.reg_offs = AVS_TMON_INT_THRESH,
	.reg_msk = AVS_TMON_INT_THRESH_high_msk,
	.reg_shift = AVS_TMON_INT_THRESH_high_shift,
	},
	/* Automatically resets chip when above threshold */
	[TMON_TRIP_TYPE_RESET] = {
	.enable_offs = AVS_TMON_EN_OVERTEMP_RESET,
	.enable_mask = AVS_TMON_EN_OVERTEMP_RESET_msk,
	.reg_offs = AVS_TMON_RESET_THRESH,
	.reg_msk = AVS_TMON_RESET_THRESH_msk,
	.reg_shift = AVS_TMON_RESET_THRESH_shift,
	},
	};

	enum {
	/*
	* Using the of-thermal framework
	*/
	AVS_TMON_OF_SENSOR_DRIVER,

	/*
	* Old DT bindings didn't include the of-sensor framework, so support a
	* full zone implementation temporarily
	*/
	AVS_TMON_ZONE_DRIVER,
	};

	struct brcmstb_thermal_priv {
	void __iomem *tmon_base;
	struct thermal_zone_device *thermal;

	/* Did this driver register as a sensor or as a zone? */
	int regtype;
	};

	/* Convert a HW code to a temperature reading (millidegree celsius) */
	static inline int avs_tmon_code_to_temp(u32 code)
	{
	return (4100400U - code * 4870U) / 10U;
	}

	/*
	* Convert a temperature value (millidegree celsius) to a HW code
	*
	* @temp: temperature to convert
	* @low: if true, round toward the low side
	*/
	static inline u32 avs_tmon_temp_to_code(unsigned long temp, bool low)
	{
	if (low)
	return DIV_ROUND_UP(4100400U - temp * 10U, 4870U);
	else
	return (4100400U - temp * 10U) / 4870U;
	}

	static int brcmstb_get_temp(void data, long temp)
	{
	struct brcmstb_thermal_priv *priv = data;
	u32 val;

	val = __raw_readl(priv->tmon_base + AVS_TMON_STATUS);

	if (!(val & AVS_TMON_STATUS_valid_msk)) {
	dev_err(&priv->thermal->device, "reading not valid\n");
	return -EIO;
	}

	val = (val & AVS_TMON_STATUS_data_msk) >> AVS_TMON_STATUS_data_shift;

	*temp = avs_tmon_code_to_temp(val);

	return 0;
	}

	/*
	* Active when the of-thermal framework is not used
	*/
	static int brcmstb_get_zone_temp(struct thermal_zone_device *thermal,
	unsigned long *temp)
	{
	return brcmstb_get_temp(thermal->devdata, temp);
	}

	static void avs_tmon_trip_enable(struct brcmstb_thermal_priv *priv,
	enum avs_tmon_trip_type type, int en)
	{
	struct avs_tmon_trip *trip = &avs_tmon_trips[type];
	u32 val = __raw_readl(priv->tmon_base + trip->enable_offs);

	pr_debug("%s trip, type %d\n", en ? "enable" : "disable", type);

	if (en)
	val \|= trip->enable_mask;
	else
	val &= ~trip->enable_mask;

	__raw_writel(val, priv->tmon_base + trip->enable_offs);
	}

	static int avs_tmon_get_trip_temp(struct brcmstb_thermal_priv *priv,
	enum avs_tmon_trip_type type)
	{
	struct avs_tmon_trip *trip = &avs_tmon_trips[type];
	u32 val = __raw_readl(priv->tmon_base + trip->reg_offs);

	val &= trip->reg_msk;
	val >>= trip->reg_shift;

	return avs_tmon_code_to_temp(val);
	}

	static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
	enum avs_tmon_trip_type type,
	unsigned long temp)
	{
	struct avs_tmon_trip *trip = &avs_tmon_trips[type];
	u32 val, orig;

	pr_debug("set temp %d to %lu\n", type, temp);

	/* round toward low temp for the low interrupt */
	val = avs_tmon_temp_to_code(temp, type == TMON_TRIP_TYPE_LOW);

	/* TODO: Check for overflow? */
	val <<= trip->reg_shift;
	val &= trip->reg_msk;

	orig = __raw_readl(priv->tmon_base + trip->reg_offs);
	orig &= ~trip->reg_msk;
	orig \|= val;
	__raw_writel(orig, priv->tmon_base + trip->reg_offs);
	}

	static int avs_tmon_get_intr_temp(struct brcmstb_thermal_priv *priv)
	{
	u32 val;

	val = __raw_readl(priv->tmon_base + AVS_TMON_TEMP_INT_CODE);
	return avs_tmon_code_to_temp(val);
	}

	static irqreturn_t brcmstb_tmon_irq_thread(int irq, void *data)
	{
	struct brcmstb_thermal_priv *priv = data;
	unsigned long low, high, intr;

	low = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_LOW);
	high = avs_tmon_get_trip_temp(priv, TMON_TRIP_TYPE_HIGH);
	intr = avs_tmon_get_intr_temp(priv);

	dev_dbg(&priv->thermal->device, "low/intr/high: %lu/%lu/%lu\n",
	low, intr, high);

	/* Disable high-temp until next threshold shift */
	if (intr >= high)
	avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
	/* Disable low-temp until next threshold shift */
	if (intr <= low)
	avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);

	/*
	* Notify using the interrupt temperature, in case the temperature
	* changes before it can next be read out
	*/
	thermal_zone_device_update_temp(priv->thermal, intr);

	return IRQ_HANDLED;
	}

	static int brcmstb_set_trips(void *data, unsigned long low, unsigned long high)
	{
	struct brcmstb_thermal_priv *priv = data;

	pr_debug("set trips %lu <--> %lu\n", low, high);

	if (low) {
	avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_LOW, low);
	avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 1);
	} else {
	avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_LOW, 0);
	}

	if (high < ULONG_MAX) {
	avs_tmon_set_trip_temp(priv, TMON_TRIP_TYPE_HIGH, high);
	avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 1);
	} else {
	avs_tmon_trip_enable(priv, TMON_TRIP_TYPE_HIGH, 0);
	}

	return 0;
	}

	static struct thermal_zone_device_ops zone_ops = {
	.get_temp = brcmstb_get_zone_temp,
	};

	static struct thermal_zone_of_device_ops of_ops = {
	.get_temp = brcmstb_get_temp,
	.set_trips = brcmstb_set_trips,
	};

	static const struct of_device_id brcmstb_thermal_id_table[] = {
	{ .compatible = "brcm,avs-tmon" },
	{},
	};
	MODULE_DEVICE_TABLE(of, brcmstb_thermal_id_table);

	/*
	* Deprecated: we should be using the of-thermal framework, rather than
	* registering our own thermal zone. This is provided as a temporary help, in
	* case of an old device tree which does not include the thermal-zones node and
	* sensor phandles.
	*/
	static int brcmstb_thermal_zone_probe(struct platform_device *pdev,
	struct brcmstb_thermal_priv *priv)
	{
	priv->thermal = thermal_zone_device_register("avs_tmon", 0, 0, priv,
	&zone_ops, NULL, 0, 0);
	if (IS_ERR(priv->thermal)) {
	dev_err(&pdev->dev, "failed to register zone device\n");
	return PTR_ERR(priv->thermal);
	}

	priv->regtype = AVS_TMON_ZONE_DRIVER;
	dev_info(&pdev->dev, "registered AVS TMON zone driver\n");

	return 0;
	}

	static int brcmstb_thermal_probe(struct platform_device *pdev)
	{
	struct thermal_zone_device *thermal;
	struct brcmstb_thermal_priv *priv;
	struct resource *res;
	int irq, ret;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->tmon_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->tmon_base))
	return PTR_ERR(priv->tmon_base);

	platform_set_drvdata(pdev, priv);

	thermal = thermal_zone_of_sensor_register(&pdev->dev, 0, priv, &of_ops);
	if (IS_ERR(thermal))
	/*
	* Fall back to registering our own zone, for legacy purposes
	*/
	return brcmstb_thermal_zone_probe(pdev, priv);
	priv->thermal = thermal;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	dev_err(&pdev->dev, "could not get IRQ\n");
	ret = irq;
	goto err;
	}
	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
	brcmstb_tmon_irq_thread, IRQF_ONESHOT,
	DRV_NAME, priv);
	if (ret < 0) {
	dev_err(&pdev->dev, "could not request IRQ: %d\n", ret);
	goto err;
	}

	priv->regtype = AVS_TMON_OF_SENSOR_DRIVER;
	dev_info(&pdev->dev, "registered AVS TMON of-sensor driver\n");

	return 0;

	err:
	thermal_zone_device_unregister(thermal);
	return ret;
	}

	static int brcmstb_thermal_exit(struct platform_device *pdev)
	{
	struct brcmstb_thermal_priv *priv = platform_get_drvdata(pdev);
	struct thermal_zone_device *thermal = priv->thermal;

	if (priv->regtype == AVS_TMON_ZONE_DRIVER)
	thermal_zone_device_unregister(thermal);
	else
	thermal_zone_of_sensor_unregister(&pdev->dev, priv->thermal);

	return 0;
	}

	static struct platform_driver brcmstb_thermal_driver = {
	.probe = brcmstb_thermal_probe,
	.remove = brcmstb_thermal_exit,
	.driver = {
	.name = DRV_NAME,
	.owner = THIS_MODULE,
	.of_match_table = brcmstb_thermal_id_table,
	},
	};
	module_platform_driver(brcmstb_thermal_driver);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Brian Norris");
	MODULE_DESCRIPTION("Broadcom STB AVS TMON thermal driver");