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Commit bffd1f8a authored by Amit Daniel Kachhap's avatar Amit Daniel Kachhap Committed by Zhang Rui
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thermal: exynos: Adapt to temperature emulation core thermal framework 



This removes the driver specific sysfs support of the temperature
emulation and uses the newly added core thermal framework for thermal
emulation. An exynos platform specific handler is added to support this.

In this patch, the exynos senor(tmu) related code and exynos framework
related (thermal zone, cooling devices) code are intentionally kept separate.
So an emulated function pointer is passed from sensor to framework. This is
beneficial in adding more sensor support using the same framework code
which is an ongoing work. The goal is to finally split them totally. Even
the existing read_temperature also follows the same execution method.

Acked-by: default avatarKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: default avatarAmit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent 51d45d25

Documentation/thermal/exynos_thermal_emulation

+4 −4
Original line number Diff line number Diff line
@@ -13,11 +13,11 @@ Thermal emulation mode supports software debug for TMU's operation. User can set 
manually with software code and TMU will read current temperature from user value not from

sensor's value.



Enabling CONFIG_EXYNOS_THERMAL_EMUL option will make this support in available.

When it's enabled, sysfs node will be created under

/sys/bus/platform/devices/'exynos device name'/ with name of 'emulation'.

Enabling CONFIG_THERMAL_EMULATION option will make this support available.

When it's enabled, sysfs node will be created as

/sys/devices/virtual/thermal/thermal_zone'zone id'/emul_temp.



The sysfs node, 'emulation', will contain value 0 for the initial state. When you input any

The sysfs node, 'emul_node', will contain value 0 for the initial state. When you input any

temperature you want to update to sysfs node, it automatically enable emulation mode and

current temperature will be changed into it.

(Exynos also supports user changable delay time which would be used to delay of

drivers/thermal/Kconfig

+0 −9
Original line number Diff line number Diff line
@@ -117,15 +117,6 @@ config EXYNOS_THERMAL 
	  If you say yes here you get support for TMU (Thermal Management

	  Unit) on SAMSUNG EXYNOS series of SoC.



config EXYNOS_THERMAL_EMUL

	bool "EXYNOS TMU emulation mode support"

	depends on EXYNOS_THERMAL

	help

	  Exynos 4412 and 4414 and 5 series has emulation mode on TMU.

	  Enable this option will be make sysfs node in exynos thermal platform

	  device directory to support emulation mode. With emulation mode sysfs

	  node, you can manually input temperature to TMU for simulation purpose.



config DOVE_THERMAL

	tristate "Temperature sensor on Marvell Dove SoCs"

	depends on ARCH_DOVE

drivers/thermal/exynos_thermal.c

+63 −95
Original line number Diff line number Diff line
@@ -100,13 +100,13 @@ 
#define IDLE_INTERVAL 10000

#define MCELSIUS	1000



#ifdef CONFIG_EXYNOS_THERMAL_EMUL

#ifdef CONFIG_THERMAL_EMULATION

#define EXYNOS_EMUL_TIME	0x57F0

#define EXYNOS_EMUL_TIME_SHIFT	16

#define EXYNOS_EMUL_DATA_SHIFT	8

#define EXYNOS_EMUL_DATA_MASK	0xFF

#define EXYNOS_EMUL_ENABLE	0x1

#endif /* CONFIG_EXYNOS_THERMAL_EMUL */

#endif /* CONFIG_THERMAL_EMULATION */



/* CPU Zone information */

#define PANIC_ZONE      4
@@ -145,6 +145,7 @@ struct thermal_cooling_conf { 
struct thermal_sensor_conf {

	char name[SENSOR_NAME_LEN];

	int (*read_temperature)(void *data);

	int (*write_emul_temp)(void *drv_data, unsigned long temp);

	struct thermal_trip_point_conf trip_data;

	struct thermal_cooling_conf cooling_data;

	void *private_data;
@@ -349,6 +350,23 @@ static int exynos_get_temp(struct thermal_zone_device *thermal, 
	return 0;

}



/* Get temperature callback functions for thermal zone */

static int exynos_set_emul_temp(struct thermal_zone_device *thermal,

						unsigned long temp)

{

	void *data;

	int ret = -EINVAL;



	if (!th_zone->sensor_conf) {

		pr_info("Temperature sensor not initialised\n");

		return -EINVAL;

	}

	data = th_zone->sensor_conf->private_data;

	if (th_zone->sensor_conf->write_emul_temp)

		ret = th_zone->sensor_conf->write_emul_temp(data, temp);

	return ret;

}



/* Get the temperature trend */

static int exynos_get_trend(struct thermal_zone_device *thermal,

			int trip, enum thermal_trend *trend)
@@ -372,6 +390,7 @@ static struct thermal_zone_device_ops const exynos_dev_ops = { 
	.bind = exynos_bind,

	.unbind = exynos_unbind,

	.get_temp = exynos_get_temp,

	.set_emul_temp = exynos_set_emul_temp,

	.get_trend = exynos_get_trend,

	.get_mode = exynos_get_mode,

	.set_mode = exynos_set_mode,
@@ -694,6 +713,47 @@ static int exynos_tmu_read(struct exynos_tmu_data *data) 
	return temp;

}



#ifdef CONFIG_THERMAL_EMULATION

static int exynos_tmu_set_emulation(void *drv_data, unsigned long temp)

{

	struct exynos_tmu_data *data = drv_data;

	unsigned int reg;

	int ret = -EINVAL;



	if (data->soc == SOC_ARCH_EXYNOS4210)

		goto out;



	if (temp && temp < MCELSIUS)

		goto out;



	mutex_lock(&data->lock);

	clk_enable(data->clk);



	reg = readl(data->base + EXYNOS_EMUL_CON);



	if (temp) {

		temp /= MCELSIUS;



		reg = (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT) |

			(temp_to_code(data, temp)

			 << EXYNOS_EMUL_DATA_SHIFT) | EXYNOS_EMUL_ENABLE;

	} else {

		reg &= ~EXYNOS_EMUL_ENABLE;

	}



	writel(reg, data->base + EXYNOS_EMUL_CON);



	clk_disable(data->clk);

	mutex_unlock(&data->lock);

	return 0;

out:

	return ret;

}

#else

static int exynos_tmu_set_emulation(void *drv_data,	unsigned long temp)

	{ return -EINVAL; }

#endif/*CONFIG_THERMAL_EMULATION*/



static void exynos_tmu_work(struct work_struct *work)

{

	struct exynos_tmu_data *data = container_of(work,
@@ -727,6 +787,7 @@ static irqreturn_t exynos_tmu_irq(int irq, void *id) 
static struct thermal_sensor_conf exynos_sensor_conf = {

	.name			= "exynos-therm",

	.read_temperature	= (int (*)(void *))exynos_tmu_read,

	.write_emul_temp	= exynos_tmu_set_emulation,

};



#if defined(CONFIG_CPU_EXYNOS4210)
@@ -833,93 +894,6 @@ static inline struct exynos_tmu_platform_data *exynos_get_driver_data( 
			platform_get_device_id(pdev)->driver_data;

}



#ifdef CONFIG_EXYNOS_THERMAL_EMUL

static ssize_t exynos_tmu_emulation_show(struct device *dev,

					 struct device_attribute *attr,

					 char *buf)

{

	struct platform_device *pdev = container_of(dev,

					struct platform_device, dev);

	struct exynos_tmu_data *data = platform_get_drvdata(pdev);

	unsigned int reg;

	u8 temp_code;

	int temp = 0;



	if (data->soc == SOC_ARCH_EXYNOS4210)

		goto out;



	mutex_lock(&data->lock);

	clk_enable(data->clk);

	reg = readl(data->base + EXYNOS_EMUL_CON);

	clk_disable(data->clk);

	mutex_unlock(&data->lock);



	if (reg & EXYNOS_EMUL_ENABLE) {

		reg >>= EXYNOS_EMUL_DATA_SHIFT;

		temp_code = reg & EXYNOS_EMUL_DATA_MASK;

		temp = code_to_temp(data, temp_code);

	}

out:

	return sprintf(buf, "%d\n", temp * MCELSIUS);

}



static ssize_t exynos_tmu_emulation_store(struct device *dev,

					struct device_attribute *attr,

					const char *buf, size_t count)

{

	struct platform_device *pdev = container_of(dev,

					struct platform_device, dev);

	struct exynos_tmu_data *data = platform_get_drvdata(pdev);

	unsigned int reg;

	int temp;



	if (data->soc == SOC_ARCH_EXYNOS4210)

		goto out;



	if (!sscanf(buf, "%d\n", &temp) || temp < 0)

		return -EINVAL;



	mutex_lock(&data->lock);

	clk_enable(data->clk);



	reg = readl(data->base + EXYNOS_EMUL_CON);



	if (temp) {

		/* Both CELSIUS and MCELSIUS type are available for input */

		if (temp > MCELSIUS)

			temp /= MCELSIUS;



		reg = (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT) |

			(temp_to_code(data, (temp / MCELSIUS))

			 << EXYNOS_EMUL_DATA_SHIFT) | EXYNOS_EMUL_ENABLE;

	} else {

		reg &= ~EXYNOS_EMUL_ENABLE;

	}



	writel(reg, data->base + EXYNOS_EMUL_CON);



	clk_disable(data->clk);

	mutex_unlock(&data->lock);



out:

	return count;

}



static DEVICE_ATTR(emulation, 0644, exynos_tmu_emulation_show,

					exynos_tmu_emulation_store);

static int create_emulation_sysfs(struct device *dev)

{

	return device_create_file(dev, &dev_attr_emulation);

}

static void remove_emulation_sysfs(struct device *dev)

{

	device_remove_file(dev, &dev_attr_emulation);

}

#else

static inline int create_emulation_sysfs(struct device *dev) { return 0; }

static inline void remove_emulation_sysfs(struct device *dev) {}

#endif



static int exynos_tmu_probe(struct platform_device *pdev)

{

	struct exynos_tmu_data *data;
@@ -1019,10 +993,6 @@ static int exynos_tmu_probe(struct platform_device *pdev) 
		goto err_clk;

	}



	ret = create_emulation_sysfs(&pdev->dev);

	if (ret)

		dev_err(&pdev->dev, "Failed to create emulation mode sysfs node\n");



	return 0;

err_clk:

	platform_set_drvdata(pdev, NULL);
@@ -1034,8 +1004,6 @@ static int exynos_tmu_remove(struct platform_device *pdev) 
{

	struct exynos_tmu_data *data = platform_get_drvdata(pdev);



	remove_emulation_sysfs(&pdev->dev);



	exynos_tmu_control(pdev, false);



	exynos_unregister_thermal();