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Message-Id: <1332137864-12943-5-git-send-email-amit.kachhap@linaro.org>
Date: Mon, 19 Mar 2012 11:47:42 +0530
From: Amit Daniel Kachhap <amit.kachhap@...aro.org>
To: linux-pm@...ts.linux-foundation.org,
linux-samsung-soc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, mjg59@...f.ucam.org,
linux-acpi@...r.kernel.org, lenb@...nel.org,
linaro-dev@...ts.linaro.org, lm-sensors@...sensors.org,
amit.kachhap@...aro.org, patches@...aro.org,
eduardo.valentin@...com, durgadoss.r@...el.com
Subject: [PATCH V2 4/6] hwmon: exynos4: Move thermal sensor driver to driver/thermal directory
This movement is needed because the hwmon entries and corresponding
sysfs interface is a duplicate of utilities already provided by
driver/thermal/thermal_sys.c. The goal is to place it in thermal folder
and add necessary functions to use the in-kernel thermal interfaces.
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@...aro.org>
Signed-off-by: Donggeun Kim <dg77.kim@...sung.com>
---
Documentation/hwmon/exynos4_tmu | 81 ------
Documentation/thermal/exynos4_tmu | 52 ++++
drivers/hwmon/Kconfig | 10 -
drivers/hwmon/Makefile | 1 -
drivers/hwmon/exynos4_tmu.c | 514 -------------------------------------
drivers/thermal/Kconfig | 10 +
drivers/thermal/Makefile | 1 +
drivers/thermal/exynos4_thermal.c | 409 +++++++++++++++++++++++++++++
8 files changed, 472 insertions(+), 606 deletions(-)
delete mode 100644 Documentation/hwmon/exynos4_tmu
create mode 100644 Documentation/thermal/exynos4_tmu
delete mode 100644 drivers/hwmon/exynos4_tmu.c
create mode 100644 drivers/thermal/exynos4_thermal.c
diff --git a/Documentation/hwmon/exynos4_tmu b/Documentation/hwmon/exynos4_tmu
deleted file mode 100644
index c3c6b41..0000000
--- a/Documentation/hwmon/exynos4_tmu
+++ /dev/null
@@ -1,81 +0,0 @@
-Kernel driver exynos4_tmu
-=================
-
-Supported chips:
-* ARM SAMSUNG EXYNOS4 series of SoC
- Prefix: 'exynos4-tmu'
- Datasheet: Not publicly available
-
-Authors: Donggeun Kim <dg77.kim@...sung.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
diff --git a/Documentation/thermal/exynos4_tmu b/Documentation/thermal/exynos4_tmu
new file mode 100644
index 0000000..2b46f67
--- /dev/null
+++ b/Documentation/thermal/exynos4_tmu
@@ -0,0 +1,52 @@
+Kernel driver exynos4_tmu
+=================
+
+Supported chips:
+* ARM SAMSUNG EXYNOS4 series of SoC
+ Prefix: 'exynos4-tmu'
+ Datasheet: Not publicly available
+
+Authors: Donggeun Kim <dg77.kim@...sung.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 kernel thermal framework
+with the function exynos4_report_trigger.
+Although an interrupt condition for level_0 can be set,
+it can be used to synchronize the cooling action.
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index dad895f..5a29885 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -313,16 +313,6 @@ 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 ARCH_EXYNOS4
- 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 8251ce8..228a4b7 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -48,7 +48,6 @@ 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
deleted file mode 100644
index f2359a0..0000000
--- a/drivers/hwmon/exynos4_tmu.c
+++ /dev/null
@@ -1,514 +0,0 @@
-/*
- * exynos4_tmu.c - Samsung EXYNOS4 TMU (Thermal Management Unit)
- *
- * Copyright (C) 2011 Samsung Electronics
- * Donggeun Kim <dg77.kim@...sung.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_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,
-};
-
-module_platform_driver(exynos4_tmu_driver);
-
-MODULE_DESCRIPTION("EXYNOS4 TMU Driver");
-MODULE_AUTHOR("Donggeun Kim <dg77.kim@...sung.com>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:exynos4-tmu");
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 24c43e3..5c5a43c 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -29,3 +29,13 @@ config CPU_THERMAL
This will be useful for platforms using the generic thermal interface
and not the ACPI interface.
If you want this support, you should say Y or M here.
+
+config SENSORS_EXYNOS4_TMU
+ tristate "Temperature sensor on Samsung EXYNOS4"
+ depends on ARCH_EXYNOS4 && THERMAL
+ 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.
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 655cbc4..d2d01e9 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -4,3 +4,4 @@
obj-$(CONFIG_THERMAL) += thermal_sys.o
obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
+obj-$(CONFIG_SENSORS_EXYNOS4_TMU) += exynos4_thermal.o
diff --git a/drivers/thermal/exynos4_thermal.c b/drivers/thermal/exynos4_thermal.c
new file mode 100644
index 0000000..ff708d5
--- /dev/null
+++ b/drivers/thermal/exynos4_thermal.c
@@ -0,0 +1,409 @@
+/*
+ * exynos4_thermal.c - Samsung EXYNOS4 TMU (Thermal Management Unit)
+ *
+ * Copyright (C) 2011 Samsung Electronics
+ * Donggeun Kim <dg77.kim@...sung.com>
+ * Amit Daniel Kachhap <amit.kachhap@...aro.org>
+ *
+ * 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/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 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);
+
+ 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 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_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;
+ }
+
+ exynos4_tmu_control(pdev, true);
+
+ return 0;
+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);
+
+ 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,
+};
+
+module_platform_driver(exynos4_tmu_driver);
+
+MODULE_DESCRIPTION("EXYNOS4 TMU Driver");
+MODULE_AUTHOR("Donggeun Kim <dg77.kim@...sung.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:exynos4-tmu");
--
1.7.1
--
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