hwmon: Add driver for EXYNOS4 TMU
authorDonggeun Kim <dg77.kim@samsung.com>
Wed, 7 Sep 2011 09:49:08 +0000 (18:49 +0900)
committerGuenter Roeck <guenter.roeck@ericsson.com>
Mon, 24 Oct 2011 18:09:35 +0000 (11:09 -0700)
This patch allows to read temperature
from TMU(Thermal Management Unit) of SAMSUNG EXYNOS4 series of SoC.

Signed-off-by: Donggeun Kim <dg77.kim@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Documentation/hwmon/exynos4_tmu [new file with mode: 0644]
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/exynos4_tmu.c [new file with mode: 0644]
include/linux/platform_data/exynos4_tmu.h [new file with mode: 0644]

diff --git a/Documentation/hwmon/exynos4_tmu b/Documentation/hwmon/exynos4_tmu
new file mode 100644 (file)
index 0000000..c3c6b41
--- /dev/null
@@ -0,0 +1,81 @@
+Kernel driver exynos4_tmu
+=================
+
+Supported chips:
+* ARM SAMSUNG EXYNOS4 series of SoC
+  Prefix: 'exynos4-tmu'
+  Datasheet: Not publicly available
+
+Authors: Donggeun Kim <dg77.kim@samsung.com>
+
+Description
+-----------
+
+This driver allows to read temperature inside SAMSUNG EXYNOS4 series of SoC.
+
+The chip only exposes the measured 8-bit temperature code value
+through a register.
+Temperature can be taken from the temperature code.
+There are three equations converting from temperature to temperature code.
+
+The three equations are:
+  1. Two point trimming
+       Tc = (T - 25) * (TI2 - TI1) / (85 - 25) + TI1
+
+  2. One point trimming
+       Tc = T + TI1 - 25
+
+  3. No trimming
+       Tc = T + 50
+
+  Tc: Temperature code, T: Temperature,
+  TI1: Trimming info for 25 degree Celsius (stored at TRIMINFO register)
+       Temperature code measured at 25 degree Celsius which is unchanged
+  TI2: Trimming info for 85 degree Celsius (stored at TRIMINFO register)
+       Temperature code measured at 85 degree Celsius which is unchanged
+
+TMU(Thermal Management Unit) in EXYNOS4 generates interrupt
+when temperature exceeds pre-defined levels.
+The maximum number of configurable threshold is four.
+The threshold levels are defined as follows:
+  Level_0: current temperature > trigger_level_0 + threshold
+  Level_1: current temperature > trigger_level_1 + threshold
+  Level_2: current temperature > trigger_level_2 + threshold
+  Level_3: current temperature > trigger_level_3 + threshold
+
+  The threshold and each trigger_level are set
+  through the corresponding registers.
+
+When an interrupt occurs, this driver notify user space of
+one of four threshold levels for the interrupt
+through kobject_uevent_env and sysfs_notify functions.
+Although an interrupt condition for level_0 can be set,
+it is not notified to user space through sysfs_notify function.
+
+Sysfs Interface
+---------------
+name           name of the temperature sensor
+               RO
+
+temp1_input    temperature
+               RO
+
+temp1_max      temperature for level_1 interrupt
+               RO
+
+temp1_crit     temperature for level_2 interrupt
+               RO
+
+temp1_emergency        temperature for level_3 interrupt
+               RO
+
+temp1_max_alarm        alarm for level_1 interrupt
+               RO
+
+temp1_crit_alarm
+               alarm for level_2 interrupt
+               RO
+
+temp1_emergency_alarm
+               alarm for level_3 interrupt
+               RO
index 0b62c3c6b7cefc2e603cdf2ed9a7972434e1e443..c6fb7611dd1019d37f6d3b29f3b77947caaf2964 100644 (file)
@@ -303,6 +303,16 @@ config SENSORS_DS1621
          This driver can also be built as a module.  If so, the module
          will be called ds1621.
 
+config SENSORS_EXYNOS4_TMU
+       tristate "Temperature sensor on Samsung EXYNOS4"
+       depends on EXYNOS4_DEV_TMU
+       help
+         If you say yes here you get support for TMU (Thermal Managment
+         Unit) on SAMSUNG EXYNOS4 series of SoC.
+
+         This driver can also be built as a module. If so, the module
+         will be called exynos4-tmu.
+
 config SENSORS_I5K_AMB
        tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
        depends on PCI && EXPERIMENTAL
index 3c9ccefea7919bae3e6cec9097f5d8ab6be48575..dbd8963ec7fa7aeca6000c146e3b6274ff1cfab5 100644 (file)
@@ -47,6 +47,7 @@ obj-$(CONFIG_SENSORS_DS1621)  += ds1621.o
 obj-$(CONFIG_SENSORS_EMC1403)  += emc1403.o
 obj-$(CONFIG_SENSORS_EMC2103)  += emc2103.o
 obj-$(CONFIG_SENSORS_EMC6W201) += emc6w201.o
+obj-$(CONFIG_SENSORS_EXYNOS4_TMU)      += exynos4_tmu.o
 obj-$(CONFIG_SENSORS_F71805F)  += f71805f.o
 obj-$(CONFIG_SENSORS_F71882FG) += f71882fg.o
 obj-$(CONFIG_SENSORS_F75375S)  += f75375s.o
diff --git a/drivers/hwmon/exynos4_tmu.c b/drivers/hwmon/exynos4_tmu.c
new file mode 100644 (file)
index 0000000..0170c90
--- /dev/null
@@ -0,0 +1,524 @@
+/*
+ * exynos4_tmu.c - Samsung EXYNOS4 TMU (Thermal Management Unit)
+ *
+ *  Copyright (C) 2011 Samsung Electronics
+ *  Donggeun Kim <dg77.kim@samsung.com>
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/workqueue.h>
+#include <linux/sysfs.h>
+#include <linux/kobject.h>
+#include <linux/io.h>
+#include <linux/mutex.h>
+
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#include <linux/platform_data/exynos4_tmu.h>
+
+#define EXYNOS4_TMU_REG_TRIMINFO       0x0
+#define EXYNOS4_TMU_REG_CONTROL                0x20
+#define EXYNOS4_TMU_REG_STATUS         0x28
+#define EXYNOS4_TMU_REG_CURRENT_TEMP   0x40
+#define EXYNOS4_TMU_REG_THRESHOLD_TEMP 0x44
+#define EXYNOS4_TMU_REG_TRIG_LEVEL0    0x50
+#define EXYNOS4_TMU_REG_TRIG_LEVEL1    0x54
+#define EXYNOS4_TMU_REG_TRIG_LEVEL2    0x58
+#define EXYNOS4_TMU_REG_TRIG_LEVEL3    0x5C
+#define EXYNOS4_TMU_REG_PAST_TEMP0     0x60
+#define EXYNOS4_TMU_REG_PAST_TEMP1     0x64
+#define EXYNOS4_TMU_REG_PAST_TEMP2     0x68
+#define EXYNOS4_TMU_REG_PAST_TEMP3     0x6C
+#define EXYNOS4_TMU_REG_INTEN          0x70
+#define EXYNOS4_TMU_REG_INTSTAT                0x74
+#define EXYNOS4_TMU_REG_INTCLEAR       0x78
+
+#define EXYNOS4_TMU_GAIN_SHIFT         8
+#define EXYNOS4_TMU_REF_VOLTAGE_SHIFT  24
+
+#define EXYNOS4_TMU_TRIM_TEMP_MASK     0xff
+#define EXYNOS4_TMU_CORE_ON    3
+#define EXYNOS4_TMU_CORE_OFF   2
+#define EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET    50
+#define EXYNOS4_TMU_TRIG_LEVEL0_MASK   0x1
+#define EXYNOS4_TMU_TRIG_LEVEL1_MASK   0x10
+#define EXYNOS4_TMU_TRIG_LEVEL2_MASK   0x100
+#define EXYNOS4_TMU_TRIG_LEVEL3_MASK   0x1000
+#define EXYNOS4_TMU_INTCLEAR_VAL       0x1111
+
+struct exynos4_tmu_data {
+       struct exynos4_tmu_platform_data *pdata;
+       struct device *hwmon_dev;
+       struct resource *mem;
+       void __iomem *base;
+       int irq;
+       struct work_struct irq_work;
+       struct mutex lock;
+       struct clk *clk;
+       u8 temp_error1, temp_error2;
+};
+
+/*
+ * TMU treats temperature as a mapped temperature code.
+ * The temperature is converted differently depending on the calibration type.
+ */
+static int temp_to_code(struct exynos4_tmu_data *data, u8 temp)
+{
+       struct exynos4_tmu_platform_data *pdata = data->pdata;
+       int temp_code;
+
+       /* temp should range between 25 and 125 */
+       if (temp < 25 || temp > 125) {
+               temp_code = -EINVAL;
+               goto out;
+       }
+
+       switch (pdata->cal_type) {
+       case TYPE_TWO_POINT_TRIMMING:
+               temp_code = (temp - 25) *
+                   (data->temp_error2 - data->temp_error1) /
+                   (85 - 25) + data->temp_error1;
+               break;
+       case TYPE_ONE_POINT_TRIMMING:
+               temp_code = temp + data->temp_error1 - 25;
+               break;
+       default:
+               temp_code = temp + EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET;
+               break;
+       }
+out:
+       return temp_code;
+}
+
+/*
+ * Calculate a temperature value from a temperature code.
+ * The unit of the temperature is degree Celsius.
+ */
+static int code_to_temp(struct exynos4_tmu_data *data, u8 temp_code)
+{
+       struct exynos4_tmu_platform_data *pdata = data->pdata;
+       int temp;
+
+       /* temp_code should range between 75 and 175 */
+       if (temp_code < 75 || temp_code > 175) {
+               temp = -ENODATA;
+               goto out;
+       }
+
+       switch (pdata->cal_type) {
+       case TYPE_TWO_POINT_TRIMMING:
+               temp = (temp_code - data->temp_error1) * (85 - 25) /
+                   (data->temp_error2 - data->temp_error1) + 25;
+               break;
+       case TYPE_ONE_POINT_TRIMMING:
+               temp = temp_code - data->temp_error1 + 25;
+               break;
+       default:
+               temp = temp_code - EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET;
+               break;
+       }
+out:
+       return temp;
+}
+
+static int exynos4_tmu_initialize(struct platform_device *pdev)
+{
+       struct exynos4_tmu_data *data = platform_get_drvdata(pdev);
+       struct exynos4_tmu_platform_data *pdata = data->pdata;
+       unsigned int status, trim_info;
+       int ret = 0, threshold_code;
+
+       mutex_lock(&data->lock);
+       clk_enable(data->clk);
+
+       status = readb(data->base + EXYNOS4_TMU_REG_STATUS);
+       if (!status) {
+               ret = -EBUSY;
+               goto out;
+       }
+
+       /* Save trimming info in order to perform calibration */
+       trim_info = readl(data->base + EXYNOS4_TMU_REG_TRIMINFO);
+       data->temp_error1 = trim_info & EXYNOS4_TMU_TRIM_TEMP_MASK;
+       data->temp_error2 = ((trim_info >> 8) & EXYNOS4_TMU_TRIM_TEMP_MASK);
+
+       /* Write temperature code for threshold */
+       threshold_code = temp_to_code(data, pdata->threshold);
+       if (threshold_code < 0) {
+               ret = threshold_code;
+               goto out;
+       }
+       writeb(threshold_code,
+               data->base + EXYNOS4_TMU_REG_THRESHOLD_TEMP);
+
+       writeb(pdata->trigger_levels[0],
+               data->base + EXYNOS4_TMU_REG_TRIG_LEVEL0);
+       writeb(pdata->trigger_levels[1],
+               data->base + EXYNOS4_TMU_REG_TRIG_LEVEL1);
+       writeb(pdata->trigger_levels[2],
+               data->base + EXYNOS4_TMU_REG_TRIG_LEVEL2);
+       writeb(pdata->trigger_levels[3],
+               data->base + EXYNOS4_TMU_REG_TRIG_LEVEL3);
+
+       writel(EXYNOS4_TMU_INTCLEAR_VAL,
+               data->base + EXYNOS4_TMU_REG_INTCLEAR);
+out:
+       clk_disable(data->clk);
+       mutex_unlock(&data->lock);
+
+       return ret;
+}
+
+static void exynos4_tmu_control(struct platform_device *pdev, bool on)
+{
+       struct exynos4_tmu_data *data = platform_get_drvdata(pdev);
+       struct exynos4_tmu_platform_data *pdata = data->pdata;
+       unsigned int con, interrupt_en;
+
+       mutex_lock(&data->lock);
+       clk_enable(data->clk);
+
+       con = pdata->reference_voltage << EXYNOS4_TMU_REF_VOLTAGE_SHIFT |
+               pdata->gain << EXYNOS4_TMU_GAIN_SHIFT;
+       if (on) {
+               con |= EXYNOS4_TMU_CORE_ON;
+               interrupt_en = pdata->trigger_level3_en << 12 |
+                       pdata->trigger_level2_en << 8 |
+                       pdata->trigger_level1_en << 4 |
+                       pdata->trigger_level0_en;
+       } else {
+               con |= EXYNOS4_TMU_CORE_OFF;
+               interrupt_en = 0; /* Disable all interrupts */
+       }
+       writel(interrupt_en, data->base + EXYNOS4_TMU_REG_INTEN);
+       writel(con, data->base + EXYNOS4_TMU_REG_CONTROL);
+
+       clk_disable(data->clk);
+       mutex_unlock(&data->lock);
+}
+
+static int exynos4_tmu_read(struct exynos4_tmu_data *data)
+{
+       u8 temp_code;
+       int temp;
+
+       mutex_lock(&data->lock);
+       clk_enable(data->clk);
+
+       temp_code = readb(data->base + EXYNOS4_TMU_REG_CURRENT_TEMP);
+       temp = code_to_temp(data, temp_code);
+
+       clk_disable(data->clk);
+       mutex_unlock(&data->lock);
+
+       return temp;
+}
+
+static void exynos4_tmu_work(struct work_struct *work)
+{
+       struct exynos4_tmu_data *data = container_of(work,
+                       struct exynos4_tmu_data, irq_work);
+
+       mutex_lock(&data->lock);
+       clk_enable(data->clk);
+
+       writel(EXYNOS4_TMU_INTCLEAR_VAL, data->base + EXYNOS4_TMU_REG_INTCLEAR);
+
+       kobject_uevent(&data->hwmon_dev->kobj, KOBJ_CHANGE);
+
+       enable_irq(data->irq);
+
+       clk_disable(data->clk);
+       mutex_unlock(&data->lock);
+}
+
+static irqreturn_t exynos4_tmu_irq(int irq, void *id)
+{
+       struct exynos4_tmu_data *data = id;
+
+       disable_irq_nosync(irq);
+       schedule_work(&data->irq_work);
+
+       return IRQ_HANDLED;
+}
+
+static ssize_t exynos4_tmu_show_name(struct device *dev,
+               struct device_attribute *attr, char *buf)
+{
+       return sprintf(buf, "exynos4-tmu\n");
+}
+
+static ssize_t exynos4_tmu_show_temp(struct device *dev,
+               struct device_attribute *attr, char *buf)
+{
+       struct exynos4_tmu_data *data = dev_get_drvdata(dev);
+       int ret;
+
+       ret = exynos4_tmu_read(data);
+       if (ret < 0)
+               return ret;
+
+       /* convert from degree Celsius to millidegree Celsius */
+       return sprintf(buf, "%d\n", ret * 1000);
+}
+
+static ssize_t exynos4_tmu_show_alarm(struct device *dev,
+               struct device_attribute *devattr, char *buf)
+{
+       struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+       struct exynos4_tmu_data *data = dev_get_drvdata(dev);
+       struct exynos4_tmu_platform_data *pdata = data->pdata;
+       int temp;
+       unsigned int trigger_level;
+
+       temp = exynos4_tmu_read(data);
+       if (temp < 0)
+               return temp;
+
+       trigger_level = pdata->threshold + pdata->trigger_levels[attr->index];
+
+       return sprintf(buf, "%d\n", !!(temp > trigger_level));
+}
+
+static ssize_t exynos4_tmu_show_level(struct device *dev,
+               struct device_attribute *devattr, char *buf)
+{
+       struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+       struct exynos4_tmu_data *data = dev_get_drvdata(dev);
+       struct exynos4_tmu_platform_data *pdata = data->pdata;
+       unsigned int temp = pdata->threshold +
+                       pdata->trigger_levels[attr->index];
+
+       return sprintf(buf, "%u\n", temp * 1000);
+}
+
+static DEVICE_ATTR(name, S_IRUGO, exynos4_tmu_show_name, NULL);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, exynos4_tmu_show_temp, NULL, 0);
+
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
+               exynos4_tmu_show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
+               exynos4_tmu_show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO,
+               exynos4_tmu_show_alarm, NULL, 3);
+
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, exynos4_tmu_show_level, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, exynos4_tmu_show_level, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp1_emergency, S_IRUGO,
+               exynos4_tmu_show_level, NULL, 3);
+
+static struct attribute *exynos4_tmu_attributes[] = {
+       &dev_attr_name.attr,
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
+       &sensor_dev_attr_temp1_max.dev_attr.attr,
+       &sensor_dev_attr_temp1_crit.dev_attr.attr,
+       &sensor_dev_attr_temp1_emergency.dev_attr.attr,
+       NULL,
+};
+
+static const struct attribute_group exynos4_tmu_attr_group = {
+       .attrs = exynos4_tmu_attributes,
+};
+
+static int __devinit exynos4_tmu_probe(struct platform_device *pdev)
+{
+       struct exynos4_tmu_data *data;
+       struct exynos4_tmu_platform_data *pdata = pdev->dev.platform_data;
+       int ret;
+
+       if (!pdata) {
+               dev_err(&pdev->dev, "No platform init data supplied.\n");
+               return -ENODEV;
+       }
+
+       data = kzalloc(sizeof(struct exynos4_tmu_data), GFP_KERNEL);
+       if (!data) {
+               dev_err(&pdev->dev, "Failed to allocate driver structure\n");
+               return -ENOMEM;
+       }
+
+       data->irq = platform_get_irq(pdev, 0);
+       if (data->irq < 0) {
+               ret = data->irq;
+               dev_err(&pdev->dev, "Failed to get platform irq\n");
+               goto err_free;
+       }
+
+       INIT_WORK(&data->irq_work, exynos4_tmu_work);
+
+       data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!data->mem) {
+               ret = -ENOENT;
+               dev_err(&pdev->dev, "Failed to get platform resource\n");
+               goto err_free;
+       }
+
+       data->mem = request_mem_region(data->mem->start,
+                       resource_size(data->mem), pdev->name);
+       if (!data->mem) {
+               ret = -ENODEV;
+               dev_err(&pdev->dev, "Failed to request memory region\n");
+               goto err_free;
+       }
+
+       data->base = ioremap(data->mem->start, resource_size(data->mem));
+       if (!data->base) {
+               ret = -ENODEV;
+               dev_err(&pdev->dev, "Failed to ioremap memory\n");
+               goto err_mem_region;
+       }
+
+       ret = request_irq(data->irq, exynos4_tmu_irq,
+               IRQF_DISABLED | IRQF_TRIGGER_RISING,
+               "exynos4-tmu", data);
+       if (ret) {
+               dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
+               goto err_io_remap;
+       }
+
+       data->clk = clk_get(NULL, "tmu_apbif");
+       if (IS_ERR(data->clk)) {
+               ret = PTR_ERR(data->clk);
+               dev_err(&pdev->dev, "Failed to get clock\n");
+               goto err_irq;
+       }
+
+       data->pdata = pdata;
+       platform_set_drvdata(pdev, data);
+       mutex_init(&data->lock);
+
+       ret = exynos4_tmu_initialize(pdev);
+       if (ret) {
+               dev_err(&pdev->dev, "Failed to initialize TMU\n");
+               goto err_clk;
+       }
+
+       ret = sysfs_create_group(&pdev->dev.kobj, &exynos4_tmu_attr_group);
+       if (ret) {
+               dev_err(&pdev->dev, "Failed to create sysfs group\n");
+               goto err_clk;
+       }
+
+       data->hwmon_dev = hwmon_device_register(&pdev->dev);
+       if (IS_ERR(data->hwmon_dev)) {
+               ret = PTR_ERR(data->hwmon_dev);
+               dev_err(&pdev->dev, "Failed to register hwmon device\n");
+               goto err_create_group;
+       }
+
+       exynos4_tmu_control(pdev, true);
+
+       return 0;
+
+err_create_group:
+       sysfs_remove_group(&pdev->dev.kobj, &exynos4_tmu_attr_group);
+err_clk:
+       platform_set_drvdata(pdev, NULL);
+       clk_put(data->clk);
+err_irq:
+       free_irq(data->irq, data);
+err_io_remap:
+       iounmap(data->base);
+err_mem_region:
+       release_mem_region(data->mem->start, resource_size(data->mem));
+err_free:
+       kfree(data);
+
+       return ret;
+}
+
+static int __devexit exynos4_tmu_remove(struct platform_device *pdev)
+{
+       struct exynos4_tmu_data *data = platform_get_drvdata(pdev);
+
+       exynos4_tmu_control(pdev, false);
+
+       hwmon_device_unregister(data->hwmon_dev);
+       sysfs_remove_group(&pdev->dev.kobj, &exynos4_tmu_attr_group);
+
+       clk_put(data->clk);
+
+       free_irq(data->irq, data);
+
+       iounmap(data->base);
+       release_mem_region(data->mem->start, resource_size(data->mem));
+
+       platform_set_drvdata(pdev, NULL);
+
+       kfree(data);
+
+       return 0;
+}
+
+#ifdef CONFIG_PM
+static int exynos4_tmu_suspend(struct platform_device *pdev, pm_message_t state)
+{
+       exynos4_tmu_control(pdev, false);
+
+       return 0;
+}
+
+static int exynos4_tmu_resume(struct platform_device *pdev)
+{
+       exynos4_tmu_initialize(pdev);
+       exynos4_tmu_control(pdev, true);
+
+       return 0;
+}
+#else
+#define exynos4_tmu_suspend NULL
+#define exynos4_tmu_resume NULL
+#endif
+
+static struct platform_driver exynos4_tmu_driver = {
+       .driver = {
+               .name   = "exynos4-tmu",
+               .owner  = THIS_MODULE,
+       },
+       .probe = exynos4_tmu_probe,
+       .remove = __devexit_p(exynos4_tmu_remove),
+       .suspend = exynos4_tmu_suspend,
+       .resume = exynos4_tmu_resume,
+};
+
+static int __init exynos4_tmu_driver_init(void)
+{
+       return platform_driver_register(&exynos4_tmu_driver);
+}
+module_init(exynos4_tmu_driver_init);
+
+static void __exit exynos4_tmu_driver_exit(void)
+{
+       platform_driver_unregister(&exynos4_tmu_driver);
+}
+module_exit(exynos4_tmu_driver_exit);
+
+MODULE_DESCRIPTION("EXYNOS4 TMU Driver");
+MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:exynos4-tmu");
diff --git a/include/linux/platform_data/exynos4_tmu.h b/include/linux/platform_data/exynos4_tmu.h
new file mode 100644 (file)
index 0000000..39e038c
--- /dev/null
@@ -0,0 +1,83 @@
+/*
+ * exynos4_tmu.h - Samsung EXYNOS4 TMU (Thermal Management Unit)
+ *
+ *  Copyright (C) 2011 Samsung Electronics
+ *  Donggeun Kim <dg77.kim@samsung.com>
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _LINUX_EXYNOS4_TMU_H
+#define _LINUX_EXYNOS4_TMU_H
+
+enum calibration_type {
+       TYPE_ONE_POINT_TRIMMING,
+       TYPE_TWO_POINT_TRIMMING,
+       TYPE_NONE,
+};
+
+/**
+ * struct exynos4_tmu_platform_data
+ * @threshold: basic temperature for generating interrupt
+ *            25 <= threshold <= 125 [unit: degree Celsius]
+ * @trigger_levels: array for each interrupt levels
+ *     [unit: degree Celsius]
+ *     0: temperature for trigger_level0 interrupt
+ *        condition for trigger_level0 interrupt:
+ *             current temperature > threshold + trigger_levels[0]
+ *     1: temperature for trigger_level1 interrupt
+ *        condition for trigger_level1 interrupt:
+ *             current temperature > threshold + trigger_levels[1]
+ *     2: temperature for trigger_level2 interrupt
+ *        condition for trigger_level2 interrupt:
+ *             current temperature > threshold + trigger_levels[2]
+ *     3: temperature for trigger_level3 interrupt
+ *        condition for trigger_level3 interrupt:
+ *             current temperature > threshold + trigger_levels[3]
+ * @trigger_level0_en:
+ *     1 = enable trigger_level0 interrupt,
+ *     0 = disable trigger_level0 interrupt
+ * @trigger_level1_en:
+ *     1 = enable trigger_level1 interrupt,
+ *     0 = disable trigger_level1 interrupt
+ * @trigger_level2_en:
+ *     1 = enable trigger_level2 interrupt,
+ *     0 = disable trigger_level2 interrupt
+ * @trigger_level3_en:
+ *     1 = enable trigger_level3 interrupt,
+ *     0 = disable trigger_level3 interrupt
+ * @gain: gain of amplifier in the positive-TC generator block
+ *     0 <= gain <= 15
+ * @reference_voltage: reference voltage of amplifier
+ *     in the positive-TC generator block
+ *     0 <= reference_voltage <= 31
+ * @cal_type: calibration type for temperature
+ *
+ * This structure is required for configuration of exynos4_tmu driver.
+ */
+struct exynos4_tmu_platform_data {
+       u8 threshold;
+       u8 trigger_levels[4];
+       bool trigger_level0_en;
+       bool trigger_level1_en;
+       bool trigger_level2_en;
+       bool trigger_level3_en;
+
+       u8 gain;
+       u8 reference_voltage;
+
+       enum calibration_type cal_type;
+};
+#endif /* _LINUX_EXYNOS4_TMU_H */