Re: [PATCH] hwmon: Add driver for EXYNOS4 TMU

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On Thu, 2011-08-25 at 04:13 -0400, Donggeun Kim wrote:
> This patch allows to read temperature
> from TMU(Thermal Management Unit) of SAMSUNG EXYNOS4 series of SoC.
> 
> Signed-off-by: Donggeun Kim <dg77.kim@xxxxxxxxxxx>
> Signed-off-by: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> ---
>  Documentation/hwmon/exynos4_tmu           |   66 ++++
>  drivers/hwmon/Kconfig                     |   10 +
>  drivers/hwmon/Makefile                    |    1 +
>  drivers/hwmon/exynos4_tmu.c               |  478 +++++++++++++++++++++++++++++
>  include/linux/platform_data/exynos4_tmu.h |   83 +++++
>  5 files changed, 638 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/hwmon/exynos4_tmu
>  create mode 100644 drivers/hwmon/exynos4_tmu.c
>  create mode 100644 include/linux/platform_data/exynos4_tmu.h
> 
> diff --git a/Documentation/hwmon/exynos4_tmu b/Documentation/hwmon/exynos4_tmu
> new file mode 100644
> index 0000000..27d8ab6
> --- /dev/null
> +++ b/Documentation/hwmon/exynos4_tmu
> @@ -0,0 +1,66 @@
> +Kernel driver exynos4_tmu
> +=================
> +
> +Supported chips:
> +* ARM SAMSUNG EXYNOS4 series of SoC
> +  Prefix: 'exynos4-tmu'
> +  Datasheet: Not publicly available
> +
> +Authors: Donggeun Kim <dg77.kim@xxxxxxxxxxx>
> +
> +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.
> +
> +Sysfs Interface
> +---------------
> +name           name of the temperature sensor
> +               RO
> +
> +temp1_input    temperature
> +               RO
> +
> +temp1_alarm    shows which interrupt threshold level is met
> +               1: current temperature exceeds level_0
> +               10: current temperature exceeds level_1
> +               100: current temperature exceeds level_2
> +               1000: current temperature exceeds level_3
> +               RO
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 0b62c3c..c6fb761 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -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
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 3c9ccef..dbd8963 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -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
> index 0000000..b433c47
> --- /dev/null
> +++ b/drivers/hwmon/exynos4_tmu.c
> @@ -0,0 +1,478 @@
> +/*
> + * exynos4_tmu.c - Samsung EXYNOS4 TMU (Thermal Management Unit)
> + *
> + *  Copyright (C) 2011 Samsung Electronics
> + *  Donggeun Kim <dg77.kim@xxxxxxxxxxx>
> + *
> + * 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/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 clk *clk;
> +       unsigned int interrupt_stat;
> +       u8 temp_error1, temp_error2;
> +};
> +
> +/*
> + * TMU treats temperature as a mapped temperature code.
> + * The temperature is converted differently depending on the calibration type.
> + */
> +static u8 translate_temp_to_code(struct exynos4_tmu_data *data, u8 temp)
> +{
> +       struct exynos4_tmu_platform_data *pdata = data->pdata;
> +       unsigned int temp_code;
> +
> +       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;
> +       }
> +
> +       return temp_code;
> +}
> +
> +/*
> + * Calculate a temperature value from a temperature code.
> + * The unit of the temperature is degree Celsius.
> + */
> +static u8 translate_code_to_temp(struct exynos4_tmu_data *data, u8 temp_code)
> +{
> +       struct exynos4_tmu_platform_data *pdata = data->pdata;
> +       unsigned int temp;
> +
> +       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;
> +       }
> +
> +       return temp;
> +}
> +
> +static void 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, interrupt_en;
> +       u8 threshold_code;
> +
> +       clk_enable(data->clk);
> +
> +       status = readb(data->base + EXYNOS4_TMU_REG_STATUS);
> +       if (!status) {
> +               printk(KERN_INFO "TMU is busy\n");

Please use dev_info(&pdev->dev, ...);

> +               clk_disable(data->clk);
> +               return;

Are you sure it is a good idea to ignore this error ? Limits won't be
set, threshold won't be set, trigger levels won't be set. In other
words, the chip is left in a completely uninitialized and thus
unpredictable state.

It might be better to abort driver initialization if this happens.

> +       }
> +
> +       /* 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 = translate_temp_to_code(data, pdata->threshold);
> +       writeb(threshold_code,
> +               data->base + EXYNOS4_TMU_REG_THRESHOLD_TEMP);
> +
> +       writeb(pdata->trigger_level0,
> +               data->base + EXYNOS4_TMU_REG_TRIG_LEVEL0);
> +       writeb(pdata->trigger_level1,
> +               data->base + EXYNOS4_TMU_REG_TRIG_LEVEL1);
> +       writeb(pdata->trigger_level2,
> +               data->base + EXYNOS4_TMU_REG_TRIG_LEVEL2);
> +       writeb(pdata->trigger_level3,
> +               data->base + EXYNOS4_TMU_REG_TRIG_LEVEL3);
> +
> +       writel(EXYNOS4_TMU_INTCLEAR_VAL,
> +               data->base + EXYNOS4_TMU_REG_INTCLEAR);
> +
> +       interrupt_en = pdata->trigger_level3_en << 12 |
> +               pdata->trigger_level2_en << 8 |
> +               pdata->trigger_level1_en << 4 |
> +               pdata->trigger_level0_en;
> +       writel(interrupt_en, data->base + EXYNOS4_TMU_REG_INTEN);
> +
> +       clk_disable(data->clk);
> +}
> +
> +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;
> +
> +       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;
> +       else
> +               con |= EXYNOS4_TMU_CORE_OFF;
> +
> +       writel(con, data->base + EXYNOS4_TMU_REG_CONTROL);
> +
> +       clk_disable(data->clk);
> +}
> +
> +static int exynos4_tmu_read(struct exynos4_tmu_data *data, u8 *temp)
> +{
> +       u8 temp_code;
> +
> +       clk_enable(data->clk);
> +
> +       temp_code = readb(data->base + EXYNOS4_TMU_REG_CURRENT_TEMP);
> +       if (!temp_code) {
> +               dev_err(data->hwmon_dev, "Failed to read temperature code\n");

dev_err and EAGAIN ? Is this really necessary ? EAGAIN will result in a
retry; if the condition is permanent you'll fill the log pretty quickly.

> +               clk_disable(data->clk);
> +               return -EAGAIN;
> +       }
> +       *temp = translate_code_to_temp(data, temp_code);
> +
> +       clk_disable(data->clk);
> +
> +       return 0;
> +}
> +
> +static void exynos4_tmu_work(struct work_struct *work)
> +{
> +       struct exynos4_tmu_data *data = container_of(work,
> +                       struct exynos4_tmu_data, irq_work);
> +       char *envp[2];
> +
> +       clk_enable(data->clk);
> +
> +       data->interrupt_stat = readl(data->base + EXYNOS4_TMU_REG_INTSTAT);
> +
> +       writel(EXYNOS4_TMU_INTCLEAR_VAL, data->base + EXYNOS4_TMU_REG_INTCLEAR);
> +
> +       if (data->interrupt_stat & EXYNOS4_TMU_TRIG_LEVEL3_MASK)
> +               envp[0] = "TRIG_LEVEL=3";
> +       else if (data->interrupt_stat & EXYNOS4_TMU_TRIG_LEVEL2_MASK)
> +               envp[0] = "TRIG_LEVEL=2";
> +       else if (data->interrupt_stat & EXYNOS4_TMU_TRIG_LEVEL1_MASK)
> +               envp[0] = "TRIG_LEVEL=1";
> +       else
> +               envp[0] = "TRIG_LEVEL=0";
> +       envp[1] = NULL;
> +
> +       sysfs_notify(&data->hwmon_dev->kobj, NULL, "temp1_alarm");
> +       kobject_uevent_env(&data->hwmon_dev->kobj, KOBJ_CHANGE, envp);
> +       enable_irq(data->irq);
> +
> +       clk_disable(data->clk);
> +}
> +
> +static irqreturn_t exynos4_tmu_irq(int irq, void *id)
> +{
> +       struct exynos4_tmu_data *data = id;
> +
> +       if (!work_pending(&data->irq_work)) {
> +               disable_irq_nosync(irq);
> +               schedule_work(&data->irq_work);
> +       } else {
> +               dev_err(data->hwmon_dev, "irq_work pending\n");
> +       }
> +
> +       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;
> +       u8 temp;
> +
> +       ret = exynos4_tmu_read(data, &temp);
> +       if (ret)
> +               return ret;
> +       /* convert from degree Celsius to millidegree Celsius */
> +       return sprintf(buf, "%d\n", temp * 1000);
> +}
> +
> +static ssize_t exynos4_tmu_show_alarm(struct device *dev,
> +               struct device_attribute *attr, char *buf)
> +{
> +       struct exynos4_tmu_data *data = dev_get_drvdata(dev);
> +
> +       /*
> +        * 1: trigger_level0 interrupt generated
> +        * 10: trigger_level1 interrupt generated
> +        * 100: trigger_level2 interrupt generated
> +        * 1000: trigger_level3 interrupt generated
> +        */
> +       return sprintf(buf, "%x\n", data->interrupt_stat);
> +}
> +
> +static DEVICE_ATTR(name, S_IRUGO, exynos4_tmu_show_name, NULL);
> +static DEVICE_ATTR(temp1_alarm, S_IRUGO, exynos4_tmu_show_alarm, NULL);
> +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, exynos4_tmu_show_temp, NULL, 0);
> +
> +static struct attribute *exynos4_tmu_attributes[] = {
> +       &dev_attr_name.attr,
> +       &dev_attr_temp1_alarm.attr,
> +       &sensor_dev_attr_temp1_input.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 irq1\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 = -EBUSY;
> +               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 = -EBUSY;
> +               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 = -EINVAL;
> +               dev_err(&pdev->dev, "Failed to get clock\n");
> +               goto err_irq;
> +       }
> +
> +       data->pdata = pdata;
> +       platform_set_drvdata(pdev, data);
> +
> +       ret = sysfs_create_group(&pdev->dev.kobj, &exynos4_tmu_attr_group);
> +       if (ret) {
> +               dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret);
> +               goto err_clk;
> +       }
> +
> +       data->hwmon_dev = hwmon_device_register(&pdev->dev);
> +       if (IS_ERR(data->hwmon_dev)) {
> +               ret = PTR_ERR(data->hwmon_dev);
> +               goto err_create_group;
> +       }
> +
> +       exynos4_tmu_initialize(pdev);
> +       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);
> +
> +       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@xxxxxxxxxxx>");
> +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
> index 0000000..b98f024
> --- /dev/null
> +++ b/include/linux/platform_data/exynos4_tmu.h
> @@ -0,0 +1,83 @@
> +/*
> + * exynos4_tmu.h - Samsung EXYNOS4 TMU (Thermal Management Unit)
> + *
> + *  Copyright (C) 2011 Samsung Electronics
> + *  Donggeun Kim <dg77.kim@xxxxxxxxxxx>
> + *
> + * 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
> + * @trigger_level0: terperature for trigger_level0 interrupt
> + *     condition for trigger_level0 interrupt:
> + *             current temperature > threshold + trigger_level0
> + * @trigger_level1: terperature for trigger_level1 interrupt
> + *     condition for trigger_level1 interrupt:
> + *             current temperature > threshold + trigger_level1
> + * @trigger_level2: terperature for trigger_level2 interrupt
> + *     condition for trigger_level2 interrupt:
> + *             current temperature > threshold + trigger_level2
> + * @trigger_level3: terperature for trigger_level3 interrupt
> + *     condition for trigger_level3 interrupt:
> + *             current temperature > threshold + trigger_level3
> + * @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_level0;
> +       u8 trigger_level1;
> +       u8 trigger_level2;
> +       u8 trigger_level3;
> +       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 */
> --
> 1.7.4.1
> 


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