[PATCH 5/5] Thermal: Add ST-Ericsson db8500 thermal dirver.

[hongbo.zhang]

From: "hongbo.zhang" <hongbo.zhang@xxxxxxxxxx>

This diver is based on the thermal management framework in thermal_sys.c.
A thermal zone device is created with the trip points to which cooling
devices can be bound, the current cooling device is cpufreq, e.g. CPU
frequency is clipped down to cool the CPU, and other cooling devices can
be added and bound to the trip points dynamically.
The platform specific PRCMU interrupts are used to active thermal update
when trip points are reached.

Signed-off-by: hongbo.zhang <hongbo.zhang@xxxxxxxxxx>
---
 arch/arm/boot/dts/dbx5x0.dtsi                |  11 +
 arch/arm/configs/u8500_defconfig             |   4 +
 arch/arm/mach-ux500/board-mop500.c           |  73 ++++
 drivers/thermal/Kconfig                      |  20 ++
 drivers/thermal/Makefile                     |   2 +
 drivers/thermal/db8500_cpufreq_cooling.c     | 118 +++++++
 drivers/thermal/db8500_thermal.c             | 507 +++++++++++++++++++++++++++
 include/linux/platform_data/db8500_thermal.h |  39 +++
 8 files changed, 774 insertions(+)
 create mode 100644 drivers/thermal/db8500_cpufreq_cooling.c
 create mode 100644 drivers/thermal/db8500_thermal.c
 create mode 100644 include/linux/platform_data/db8500_thermal.h

diff --git a/arch/arm/boot/dts/dbx5x0.dtsi b/arch/arm/boot/dts/dbx5x0.dtsi
index 748ba7a..795d7ee 100644
--- a/arch/arm/boot/dts/dbx5x0.dtsi
+++ b/arch/arm/boot/dts/dbx5x0.dtsi
@@ -174,6 +174,10 @@
 			compatible = "stericsson,nmk_pinctrl";
 		};
 
+		cpufreq-cooling {
+			 compatible = "stericsson,db8500-cpufreq-cooling";
+		 };
+
 		usb@a03e0000 {
 			compatible = "stericsson,db8500-musb",
 				"mentor,musb";
@@ -203,6 +207,13 @@
 				reg = <0x80157450 0xC>;
 			};
 
+			thermal@801573c0 {
+				 compatible = "stericsson,db8500-thermal";
+				 reg = <0x801573c0 0x40>;
+				 interrupts = <21 0x4>, <22 0x4>;
+				 interrupt-names = "IRQ_HOTMON_LOW", "IRQ_HOTMON_HIGH";
+			 };
+
 			db8500-prcmu-regulators {
 				compatible = "stericsson,db8500-prcmu-regulator";
 
diff --git a/arch/arm/configs/u8500_defconfig b/arch/arm/configs/u8500_defconfig
index cc5e7a8..34918c4 100644
--- a/arch/arm/configs/u8500_defconfig
+++ b/arch/arm/configs/u8500_defconfig
@@ -118,3 +118,7 @@ CONFIG_DEBUG_KERNEL=y
 CONFIG_DEBUG_INFO=y
 # CONFIG_FTRACE is not set
 CONFIG_DEBUG_USER=y
+CONFIG_THERMAL=y
+CONFIG_CPU_THERMAL=y
+CONFIG_DB8500_THERMAL=y
+CONFIG_DB8500_CPUFREQ_COOLING=y
diff --git a/arch/arm/mach-ux500/board-mop500.c b/arch/arm/mach-ux500/board-mop500.c
index 416d436..5bbd3b5 100644
--- a/arch/arm/mach-ux500/board-mop500.c
+++ b/arch/arm/mach-ux500/board-mop500.c
@@ -33,6 +33,8 @@
 #include <linux/smsc911x.h>
 #include <linux/gpio_keys.h>
 #include <linux/delay.h>
+#include <linux/platform_data/db8500_thermal.h>
+
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/leds.h>
@@ -229,6 +231,71 @@ static struct ab8500_platform_data ab8500_platdata = {
 };
 
 /*
+ * Thermal Sensor
+ */
+
+static struct resource db8500_thsens_resources[] = {
+	{
+		.name = "IRQ_HOTMON_LOW",
+		.start  = IRQ_PRCMU_HOTMON_LOW,
+		.end    = IRQ_PRCMU_HOTMON_LOW,
+		.flags  = IORESOURCE_IRQ,
+	},
+	{
+		.name = "IRQ_HOTMON_HIGH",
+		.start  = IRQ_PRCMU_HOTMON_HIGH,
+		.end    = IRQ_PRCMU_HOTMON_HIGH,
+		.flags  = IORESOURCE_IRQ,
+	},
+};
+
+static struct db8500_trip_point db8500_trips_table[] = {
+	[0] = {
+		.temp = 70000,
+		.type = THERMAL_TRIP_ACTIVE,
+		.cooling_dev_name = {
+			[0] = "thermal-cpufreq-0",
+		},
+	},
+	[1] = {
+		.temp = 75000,
+		.type = THERMAL_TRIP_ACTIVE,
+		.cooling_dev_name = {
+			[0] = "thermal-cpufreq-0",
+		},
+	},
+	[2] = {
+		.temp = 80000,
+		.type = THERMAL_TRIP_ACTIVE,
+		.cooling_dev_name = {
+			[0] = "thermal-cpufreq-0",
+		},
+	},
+	[3] = {
+		.temp = 85000,
+		.type = THERMAL_TRIP_CRITICAL,
+	},
+};
+
+static struct db8500_thsens_platform_data db8500_thsens_data = {
+	.trip_points    = db8500_trips_table,
+	.num_trips      = ARRAY_SIZE(db8500_trips_table),
+};
+
+static struct platform_device u8500_thsens_device = {
+	.name           = "db8500-thermal",
+	.resource       = db8500_thsens_resources,
+	.num_resources  = ARRAY_SIZE(db8500_thsens_resources),
+	.dev	= {
+		.platform_data	= &db8500_thsens_data,
+	},
+};
+
+static struct platform_device u8500_cpufreq_cooling_device = {
+	.name           = "db8500-cpufreq-cooling",
+};
+
+/*
  * TPS61052
  */
 
@@ -583,6 +650,8 @@ static struct platform_device *snowball_platform_devs[] __initdata = {
 	&snowball_key_dev,
 	&snowball_sbnet_dev,
 	&snowball_gpio_en_3v3_regulator_dev,
+	&u8500_thsens_device,
+	&u8500_cpufreq_cooling_device,
 };
 
 static void __init mop500_init_machine(void)
@@ -765,6 +834,10 @@ struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = {
 		"ux500-msp-i2s.2", &msp2_platform_data),
 	OF_DEV_AUXDATA("stericsson,ux500-msp-i2s", 0x80125000,
 		"ux500-msp-i2s.3", &msp3_platform_data),
+	OF_DEV_AUXDATA("stericsson,db8500-thermal", 0x801573c0,
+			"db8500-thermal", &db8500_thsens_data),
+	OF_DEV_AUXDATA("stericsson,db8500-cpufreq-cooling", 0,
+			"db8500-cpufreq-cooling", NULL),
 	{},
 };
 
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index edfd67d..6607cba 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -30,6 +30,26 @@ config CPU_THERMAL
 	  and not the ACPI interface.
 	  If you want this support, you should say Y here.
 
+config DB8500_THERMAL
+	bool "DB8500 thermal management"
+	depends on THERMAL
+	default y
+	help
+	  Adds DB8500 thermal management implementation according to the thermal
+	  management framework. A thermal zone with several trip points will be
+	  created. Cooling devices can be bound to the trip points to cool this
+	  thermal zone if trip points reached.
+
+config DB8500_CPUFREQ_COOLING
+	tristate "DB8500 cpufreq cooling"
+	depends on CPU_THERMAL
+	default y
+	help
+	  Adds DB8500 cpufreq cooling devices, and these cooling devices can be
+	  bound to thermal zone trip points. When a trip point reached, the
+	  bound cpufreq cooling device turns active to set CPU frequency low to
+	  cool down the CPU.
+
 config SPEAR_THERMAL
 	bool "SPEAr thermal sensor driver"
 	depends on THERMAL
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 885550d..c7a8dab 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -7,3 +7,5 @@ obj-$(CONFIG_CPU_THERMAL)		+= cpu_cooling.o
 obj-$(CONFIG_SPEAR_THERMAL)		+= spear_thermal.o
 obj-$(CONFIG_RCAR_THERMAL)	+= rcar_thermal.o
 obj-$(CONFIG_EXYNOS_THERMAL)		+= exynos_thermal.o
+obj-$(CONFIG_DB8500_THERMAL)		+= db8500_thermal.o
+obj-$(CONFIG_DB8500_CPUFREQ_COOLING)	+= db8500_cpufreq_cooling.o
diff --git a/drivers/thermal/db8500_cpufreq_cooling.c b/drivers/thermal/db8500_cpufreq_cooling.c
new file mode 100644
index 0000000..bb065d4
--- /dev/null
+++ b/drivers/thermal/db8500_cpufreq_cooling.c
@@ -0,0 +1,118 @@
+/*
+ * db8500_cpufreq_cooling.c - db8500 cpufreq works as cooling device.
+ *
+ * Copyright (C) 2012 ST-Ericsson
+ * Copyright (C) 2012 Linaro Ltd.
+ *
+ * Author: Hongbo Zhang <hognbo.zhang@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/cpufreq.h>
+#include <linux/cpu_cooling.h>
+#include <linux/err.h>
+
+static LIST_HEAD(db8500_cpufreq_cdev_list);
+
+struct db8500_cpufreq_cdev {
+	struct thermal_cooling_device *cdev;
+	struct list_head node;
+};
+
+static int __devinit db8500_cpufreq_cooling_probe(struct platform_device *pdev)
+{
+	struct db8500_cpufreq_cdev *cooling_devs;
+	struct cpumask mask_val;
+
+	cooling_devs = devm_kzalloc(&pdev->dev,
+			sizeof(struct db8500_cpufreq_cdev), GFP_KERNEL);
+	if (!cooling_devs)
+		return -ENOMEM;
+
+	cpumask_set_cpu(0, &mask_val);
+	cooling_devs->cdev = cpufreq_cooling_register(&mask_val);
+
+	if (IS_ERR(cooling_devs->cdev)) {
+		pr_err("Failed to register cpufreq cooling device\n");
+		return PTR_ERR(cooling_devs->cdev);
+	}
+
+	list_add_tail(&cooling_devs->node, &db8500_cpufreq_cdev_list);
+	pr_info("Cooling device registered: %s\n",
+		cooling_devs->cdev->type);
+
+	return 0;
+}
+
+static int __devexit db8500_cpufreq_cooling_remove(struct platform_device *pdev)
+{
+	struct db8500_cpufreq_cdev *cooling_devs;
+
+	list_for_each_entry(cooling_devs, &db8500_cpufreq_cdev_list, node)
+		cpufreq_cooling_unregister(cooling_devs->cdev);
+
+	return 0;
+}
+
+static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
+		pm_message_t state)
+{
+	return -ENOSYS;
+}
+
+static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
+{
+	return -ENOSYS;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id db8500_cpufreq_cooling_match[] = {
+	{ .compatible = "stericsson,db8500-cpufreq-cooling" },
+	{},
+};
+#else
+#define db8500_cpufreq_cooling_match NULL
+#endif
+
+static struct platform_driver db8500_cpufreq_cooling_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "db8500-cpufreq-cooling",
+		.of_match_table = db8500_cpufreq_cooling_match,
+	},
+	.probe = db8500_cpufreq_cooling_probe,
+	.suspend = db8500_cpufreq_cooling_suspend,
+	.resume = db8500_cpufreq_cooling_resume,
+	.remove = __devexit_p(db8500_cpufreq_cooling_remove),
+};
+
+static int __init db8500_cpufreq_cooling_init(void)
+{
+	return platform_driver_register(&db8500_cpufreq_cooling_driver);
+}
+
+static void __exit db8500_cpufreq_cooling_exit(void)
+{
+	platform_driver_unregister(&db8500_cpufreq_cooling_driver);
+}
+
+/* Should be later than db8500_cpufreq_register */
+late_initcall(db8500_cpufreq_cooling_init);
+module_exit(db8500_cpufreq_cooling_exit);
+
+MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/thermal/db8500_thermal.c b/drivers/thermal/db8500_thermal.c
new file mode 100644
index 0000000..34dcc52
--- /dev/null
+++ b/drivers/thermal/db8500_thermal.c
@@ -0,0 +1,507 @@
+/*
+ * db8500_thermal.c - db8500 Thermal Management Implementation
+ *
+ * Copyright (C) 2012 ST-Ericsson
+ * Copyright (C) 2012 Linaro Ltd.
+ *
+ * Author: Hongbo Zhang <hognbo.zhang@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+#include <linux/cpu_cooling.h>
+#include <linux/mfd/dbx500-prcmu.h>
+#include <linux/platform_data/db8500_thermal.h>
+
+#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF
+#define PRCMU_DEFAULT_LOW_TEMP 0
+
+struct db8500_thermal_zone {
+	struct thermal_zone_device *therm_dev;
+	struct mutex th_lock;
+	struct platform_device *thsens_pdev;
+	struct work_struct therm_work;
+	struct db8500_thsens_platform_data *trip_tab;
+	enum thermal_device_mode mode;
+	enum thermal_trend trend;
+	unsigned long cur_temp_pseudo;
+	unsigned int cur_index;
+	int low_irq;
+	int high_irq;
+};
+
+/* Callback to bind cooling device to thermal zone */
+static int db8500_cdev_bind(struct thermal_zone_device *thermal,
+			struct thermal_cooling_device *cdev)
+{
+	struct db8500_thermal_zone *pzone;
+	struct db8500_thsens_platform_data *ptrips;
+	char *cdev_name;
+	unsigned long max_state, upper, lower;
+	int i, j, ret;
+
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+	ptrips = pzone->trip_tab;
+
+	if (!cdev->type)
+		return -EINVAL;
+
+	ret = -ENODEV;
+	for (i = 0; i < ptrips->num_trips; i++)
+		for (j = 0; j < COOLING_DEV_MAX; j++) {
+			cdev_name = ptrips->trip_points[i].cooling_dev_name[j];
+			if (!cdev_name)
+				continue;
+
+			if (strcmp(cdev_name, cdev->type))
+				continue;
+
+			cdev->ops->get_max_state(cdev, &max_state);
+			upper = (i > max_state) ? max_state : i;
+			lower = (i > max_state) ? max_state : i;
+
+			ret = thermal_zone_bind_cooling_device(thermal, i,
+				cdev, upper, lower);
+			if (ret)
+				pr_err("Error binding cooling device.\n");
+			else
+				pr_info("Cdev %s bound.\n", cdev->type);
+		}
+
+	return ret;
+}
+
+/* Callback to unbind cooling device from thermal zone */
+static int db8500_cdev_unbind(struct thermal_zone_device *thermal,
+			  struct thermal_cooling_device *cdev)
+{
+	struct db8500_thermal_zone *pzone;
+	struct db8500_thsens_platform_data *ptrips;
+	char *cdev_name;
+	int i, j, ret;
+
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+	ptrips = pzone->trip_tab;
+
+	if (!cdev->type)
+		return -EINVAL;
+
+	ret = -ENODEV;
+	for (i = 0; i < ptrips->num_trips; i++)
+		for (j = 0; j < COOLING_DEV_MAX; j++) {
+			cdev_name = ptrips->trip_points[i].cooling_dev_name[j];
+			if (!cdev_name)
+				continue;
+
+			if (strcmp(cdev_name, cdev->type))
+				continue;
+
+			ret = thermal_zone_unbind_cooling_device(
+				thermal, i, cdev);
+			if (ret)
+				pr_err("Error unbinding cooling device.\n");
+			else
+				pr_info("Cdev %s unbound.\n", cdev->type);
+		}
+
+	return ret;
+}
+
+/* Callback to get current temperature */
+static int db8500_sys_get_temp(struct thermal_zone_device *thermal,
+				  unsigned long *temp)
+{
+	struct db8500_thermal_zone *pzone;
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+
+	/* TODO: There is no PRCMU interface to get temperature data currently,
+	so a pseudo temperature is returned , it works for the thermal framework
+	and this will be fixed when the PRCMU interface is available */
+	*temp = pzone->cur_temp_pseudo;
+
+	return 0;
+}
+
+/* Callback to get temperature changing trend */
+static int db8500_sys_get_trend(struct thermal_zone_device *thermal,
+			int trip, enum thermal_trend *trend)
+{
+	struct db8500_thermal_zone *pzone;
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+
+	*trend = pzone->trend;
+
+	return 0;
+}
+
+/* Callback to get thermal zone mode */
+static int db8500_sys_get_mode(struct thermal_zone_device *thermal,
+			    enum thermal_device_mode *mode)
+{
+	struct db8500_thermal_zone *pzone;
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+
+	mutex_lock(&pzone->th_lock);
+	*mode = pzone->mode;
+	mutex_unlock(&pzone->th_lock);
+
+	return 0;
+}
+
+/* Callback to set thermal zone mode */
+static int db8500_sys_set_mode(struct thermal_zone_device *thermal,
+			enum thermal_device_mode mode)
+{
+	struct db8500_thermal_zone *pzone;
+	struct thermal_zone_device *pthdev;
+
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+	pthdev = pzone->therm_dev;
+
+	if (!pthdev) {
+		pr_err("Thermal zone not registered.\n");
+		return 0;
+	}
+
+	mutex_lock(&pzone->th_lock);
+
+	pzone->mode = mode;
+
+	if (mode == THERMAL_DEVICE_ENABLED)
+		schedule_work(&pzone->therm_work);
+
+	mutex_unlock(&pzone->th_lock);
+
+	return 0;
+}
+
+/* Callback to get trip point type */
+static int db8500_sys_get_trip_type(struct thermal_zone_device *thermal,
+				 int trip, enum thermal_trip_type *type)
+{
+	struct db8500_thermal_zone *pzone;
+	struct db8500_thsens_platform_data *ptrips;
+
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+	ptrips = pzone->trip_tab;
+
+	if (trip >= ptrips->num_trips)
+		return -EINVAL;
+
+	*type = ptrips->trip_points[trip].type;
+
+	return 0;
+}
+
+/* Callback to get trip point temperature */
+static int db8500_sys_get_trip_temp(struct thermal_zone_device *thermal,
+				 int trip, unsigned long *temp)
+{
+	struct db8500_thermal_zone *pzone;
+	struct db8500_thsens_platform_data *ptrips;
+
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+	ptrips = pzone->trip_tab;
+
+	if (trip >= ptrips->num_trips)
+		return -EINVAL;
+
+	*temp = ptrips->trip_points[trip].temp;
+
+	return 0;
+}
+
+/* Callback to get critical trip point temperature */
+static int db8500_sys_get_crit_temp(struct thermal_zone_device *thermal,
+				 unsigned long *temp)
+{
+	struct db8500_thermal_zone *pzone;
+	struct db8500_thsens_platform_data *ptrips;
+	int i;
+
+	pzone = (struct db8500_thermal_zone *)thermal->devdata;
+	ptrips = pzone->trip_tab;
+
+	for (i = (ptrips->num_trips - 1); i > 0; i--) {
+		if (ptrips->trip_points[i].type == THERMAL_TRIP_CRITICAL) {
+			*temp = ptrips->trip_points[i].temp;
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static struct thermal_zone_device_ops thdev_ops = {
+	.bind = db8500_cdev_bind,
+	.unbind = db8500_cdev_unbind,
+	.get_temp = db8500_sys_get_temp,
+	.get_trend = db8500_sys_get_trend,
+	.get_mode = db8500_sys_get_mode,
+	.set_mode = db8500_sys_set_mode,
+	.get_trip_type = db8500_sys_get_trip_type,
+	.get_trip_temp = db8500_sys_get_trip_temp,
+	.get_crit_temp = db8500_sys_get_crit_temp,
+};
+
+static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data)
+{
+	struct db8500_thermal_zone *pzone = irq_data;
+	struct db8500_thsens_platform_data *ptrips;
+	unsigned long next_low, next_high;
+	unsigned int idx;
+
+	ptrips = pzone->trip_tab;
+	idx = pzone->cur_index;
+	if (unlikely(idx == 0))
+		/* Meaningless for thermal management, ignoring it */
+		return IRQ_HANDLED;
+
+	if (idx == 1) {
+		next_high = ptrips->trip_points[0].temp;
+		next_low = PRCMU_DEFAULT_LOW_TEMP;
+	} else {
+		next_high = ptrips->trip_points[idx-1].temp;
+		next_low = ptrips->trip_points[idx-2].temp;
+	}
+
+	pzone->cur_index -= 1;
+	pzone->cur_temp_pseudo = (next_high + next_low)/2;
+
+	prcmu_stop_temp_sense();
+	prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
+	prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
+
+	pr_debug("PRCMU set max %ld, set min %ld\n", next_high, next_low);
+
+	pzone->trend = THERMAL_TREND_DROPPING;
+	schedule_work(&pzone->therm_work);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data)
+{
+	struct db8500_thermal_zone *pzone = irq_data;
+	struct db8500_thsens_platform_data *ptrips;
+	unsigned long next_low, next_high;
+	unsigned int idx;
+
+	ptrips = pzone->trip_tab;
+	idx = pzone->cur_index;
+
+	if (idx < ptrips->num_trips - 1) {
+		next_high = ptrips->trip_points[idx+1].temp;
+		next_low = ptrips->trip_points[idx].temp;
+
+		pzone->cur_index += 1;
+		pzone->cur_temp_pseudo = (next_high + next_low)/2;
+
+		prcmu_stop_temp_sense();
+		prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
+		prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
+
+		pr_debug("PRCMU set max %ld, min %ld\n", next_high, next_low);
+	}
+
+	if (idx == ptrips->num_trips - 1)
+		pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp + 1;
+
+	pzone->trend = THERMAL_TREND_RAISING;
+	schedule_work(&pzone->therm_work);
+
+	return IRQ_HANDLED;
+}
+
+static void db8500_thermal_work(struct work_struct *work)
+{
+	enum thermal_device_mode cur_mode;
+	struct db8500_thermal_zone *pzone;
+
+	pzone = container_of(work, struct db8500_thermal_zone, therm_work);
+
+	mutex_lock(&pzone->th_lock);
+	cur_mode = pzone->mode;
+	mutex_unlock(&pzone->th_lock);
+
+	if (cur_mode == THERMAL_DEVICE_DISABLED) {
+		pr_warn("Warning: thermal function disabled.\n");
+		return;
+	}
+
+	thermal_zone_device_update(pzone->therm_dev);
+	pr_debug("db8500_thermal_work finished.\n");
+}
+
+static int __devinit db8500_thermal_probe(struct platform_device *pdev)
+{
+	struct db8500_thermal_zone *pzone = NULL;
+	struct db8500_thsens_platform_data *ptrips;
+	int low_irq, high_irq, ret = 0;
+	unsigned long dft_low, dft_high;
+
+	pzone = devm_kzalloc(&pdev->dev,
+			sizeof(struct db8500_thermal_zone), GFP_KERNEL);
+	if (!pzone)
+		return -ENOMEM;
+
+	pzone->thsens_pdev = pdev;
+
+	low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
+	if (low_irq < 0) {
+		pr_err("Get IRQ_HOTMON_LOW failed.\n");
+		return low_irq;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, low_irq, NULL,
+		prcmu_low_irq_handler,
+		IRQF_NO_SUSPEND | IRQF_ONESHOT, "dbx500_temp_low", pzone);
+	if (ret < 0) {
+		pr_err("Failed to allocate temp low irq.\n");
+		return ret;
+	}
+
+	high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
+	if (high_irq < 0) {
+		pr_err("Get IRQ_HOTMON_HIGH failed.\n");
+		return high_irq;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, high_irq, NULL,
+		prcmu_high_irq_handler,
+		IRQF_NO_SUSPEND | IRQF_ONESHOT, "dbx500_temp_high", pzone);
+	if (ret < 0) {
+		pr_err("Failed to allocate temp high irq.\n");
+		return ret;
+	}
+
+	pzone->low_irq = low_irq;
+	pzone->high_irq = high_irq;
+
+	pzone->mode = THERMAL_DEVICE_DISABLED;
+
+	mutex_init(&pzone->th_lock);
+
+	INIT_WORK(&pzone->therm_work, db8500_thermal_work);
+
+	ptrips = pdev->dev.platform_data;
+	pzone->trip_tab = ptrips;
+
+	pzone->therm_dev = thermal_zone_device_register("db8500_thermal_zone",
+		ptrips->num_trips, 0, pzone, &thdev_ops, 0, 0);
+
+	if (IS_ERR(pzone->therm_dev)) {
+		pr_err("Failed to register thermal zone device\n");
+		return PTR_ERR(pzone->therm_dev);
+	}
+
+	dft_low = PRCMU_DEFAULT_LOW_TEMP;
+	dft_high = ptrips->trip_points[0].temp;
+
+	prcmu_stop_temp_sense();
+	prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));
+	prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
+
+	pzone->cur_index = 0;
+	pzone->cur_temp_pseudo = (dft_low + dft_high)/2;
+	pzone->trend = THERMAL_TREND_STABLE;
+	pzone->mode = THERMAL_DEVICE_ENABLED;
+
+	platform_set_drvdata(pdev, pzone);
+
+	return 0;
+}
+
+static int __devexit db8500_thermal_remove(struct platform_device *pdev)
+{
+	struct db8500_thermal_zone *pzone;
+	pzone = platform_get_drvdata(pdev);
+
+	cancel_work_sync(&pzone->therm_work);
+
+	if (pzone->therm_dev)
+		thermal_zone_device_unregister(pzone->therm_dev);
+
+	return 0;
+}
+
+static int db8500_thermal_suspend(struct platform_device *pdev,
+		pm_message_t state)
+{
+	struct db8500_thermal_zone *pzone;
+	pzone = platform_get_drvdata(pdev);
+
+	flush_work_sync(&pzone->therm_work);
+	prcmu_stop_temp_sense();
+
+	return 0;
+}
+
+static int db8500_thermal_resume(struct platform_device *pdev)
+{
+	struct db8500_thermal_zone *pzone;
+	struct db8500_thsens_platform_data *ptrips;
+	unsigned long dft_low, dft_high;
+
+	pzone = platform_get_drvdata(pdev);
+	ptrips = pzone->trip_tab;
+	dft_low = PRCMU_DEFAULT_LOW_TEMP;
+	dft_high = ptrips->trip_points[0].temp;
+
+	prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));
+	prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id db8500_thermal_match[] = {
+	{ .compatible = "stericsson,db8500-thermal" },
+	{},
+};
+#else
+#define db8500_thermal_match NULL
+#endif
+
+static struct platform_driver db8500_thermal_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "db8500-thermal",
+		.of_match_table = db8500_thermal_match,
+	},
+	.probe = db8500_thermal_probe,
+	.suspend = db8500_thermal_suspend,
+	.resume = db8500_thermal_resume,
+	.remove = __devexit_p(db8500_thermal_remove),
+};
+
+static int __init db8500_thermal_init(void)
+{
+	return platform_driver_register(&db8500_thermal_driver);
+}
+
+static void __exit db8500_thermal_exit(void)
+{
+	platform_driver_unregister(&db8500_thermal_driver);
+}
+
+module_init(db8500_thermal_init);
+module_exit(db8500_thermal_exit);
+
+MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("DB8500 thermal driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/platform_data/db8500_thermal.h b/include/linux/platform_data/db8500_thermal.h
new file mode 100644
index 0000000..0b6d164
--- /dev/null
+++ b/include/linux/platform_data/db8500_thermal.h
@@ -0,0 +1,39 @@
+/*
+ * db8500_thermal.h - db8500 Thermal Management Implementation
+ *
+ * Copyright (C) 2012 ST-Ericsson
+ * Copyright (C) 2012 Linaro Ltd.
+ *
+ * Author: Hongbo Zhang <hognbo.zhang@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ */
+
+#ifndef _DB8500_THERMAL_H_
+#define _DB8500_THERMAL_H_
+
+#include <linux/thermal.h>
+
+#define COOLING_DEV_MAX 8
+
+struct db8500_trip_point {
+	unsigned long temp;
+	enum thermal_trip_type type;
+	char *cooling_dev_name[COOLING_DEV_MAX];
+};
+
+struct db8500_thsens_platform_data {
+	struct db8500_trip_point *trip_points;
+	int num_trips;
+};
+
+#endif /* _DB8500_THERMAL_H_ */
-- 
1.7.11.3

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