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Commit 3152fb9f authored by Zhang, Rui's avatar Zhang, Rui Committed by Len Brown
Browse files

thermal: fix generic thermal I/F for hwmon 



Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent baadac8b

Documentation/thermal/sysfs-api.txt

+11 −11
Original line number Diff line number Diff line
@@ -143,10 +143,10 @@ type Strings which represent the thermal zone type. 
				This is given by thermal zone driver as part of registration.

				Eg: "ACPI thermal zone" indicates it's a ACPI thermal device

				RO

				Optional

				Required



temp				Current temperature as reported by thermal zone (sensor)

				Unit: degree Celsius

				Unit: millidegree Celsius

				RO

				Required
@@ -163,7 +163,7 @@ mode One of the predefined values in [kernel, user] 
					  charge of the thermal management.



trip_point_[0-*]_temp		The temperature above which trip point will be fired

				Unit: degree Celsius

				Unit: millidegree Celsius

				RO

				Optional
@@ -193,7 +193,7 @@ type String which represents the type of device 
				eg. For memory controller device on intel_menlow platform:

				this should be "Memory controller"

				RO

				Optional

				Required



max_state			The maximum permissible cooling state of this cooling device.

				RO
@@ -219,16 +219,16 @@ the sys I/F structure will be built like this: 


|thermal_zone1:

	|-----type:			ACPI thermal zone

	|-----temp:			37

	|-----temp:			37000

	|-----mode:			kernel

	|-----trip_point_0_temp:	100

	|-----trip_point_0_temp:	100000

	|-----trip_point_0_type:	critical

	|-----trip_point_1_temp:	80

	|-----trip_point_1_temp:	80000

	|-----trip_point_1_type:	passive

	|-----trip_point_2_temp:	70

	|-----trip_point_2_type:	active[0]

	|-----trip_point_3_temp:	60

	|-----trip_point_3_type:	active[1]

	|-----trip_point_2_temp:	70000

	|-----trip_point_2_type:	active0

	|-----trip_point_3_temp:	60000

	|-----trip_point_3_type:	active1

	|-----cdev0:			--->/sys/class/thermal/cooling_device0

	|-----cdev0_trip_point:		1	/* cdev0 can be used for passive */

	|-----cdev1:			--->/sys/class/thermal/cooling_device3

drivers/thermal/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 


menuconfig THERMAL

	bool "Generic Thermal sysfs driver"

	select HWMON

	default y

	help

	  Generic Thermal Sysfs driver offers a generic mechanism for

drivers/thermal/thermal.c

+143 −26
Original line number Diff line number Diff line
@@ -30,8 +30,10 @@ 
#include <linux/idr.h>

#include <linux/thermal.h>

#include <linux/spinlock.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>



MODULE_AUTHOR("Zhang Rui")

MODULE_AUTHOR("Zhang Rui");

MODULE_DESCRIPTION("Generic thermal management sysfs support");

MODULE_LICENSE("GPL");
@@ -56,6 +58,9 @@ static LIST_HEAD(thermal_tz_list); 
static LIST_HEAD(thermal_cdev_list);

static DEFINE_MUTEX(thermal_list_lock);



static struct device *thermal_hwmon;

#define MAX_THERMAL_ZONES	10



static int get_idr(struct idr *idr, struct mutex *lock, int *id)

{

	int err;
@@ -87,7 +92,67 @@ static void release_idr(struct idr *idr, struct mutex *lock, int id) 
		mutex_unlock(lock);

}



/* sys I/F for thermal zone */

/* hwmon sys I/F*/

static ssize_t

name_show(struct device *dev, struct device_attribute *attr, char *buf)

{

	return sprintf(buf, "thermal_sys_class\n");

}



static ssize_t

temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)

{

	struct thermal_zone_device *tz;

	struct sensor_device_attribute *sensor_attr

						= to_sensor_dev_attr(attr);



	list_for_each_entry(tz, &thermal_tz_list, node)

		if (tz->id == sensor_attr->index)

			return tz->ops->get_temp(tz, buf);



	return -ENODEV;

}



static ssize_t

temp_crit_show(struct device *dev, struct device_attribute *attr,

		char *buf)

{

	struct thermal_zone_device *tz;

	struct sensor_device_attribute *sensor_attr

						= to_sensor_dev_attr(attr);



	list_for_each_entry(tz, &thermal_tz_list, node)

		if (tz->id == sensor_attr->index)

			return tz->ops->get_trip_temp(tz, 0, buf);



	return -ENODEV;

}



static DEVICE_ATTR(name, 0444, name_show, NULL);

static struct sensor_device_attribute sensor_attrs[] = {

	SENSOR_ATTR(temp1_input, 0444, temp_input_show, NULL, 0),

	SENSOR_ATTR(temp1_crit, 0444, temp_crit_show, NULL, 0),

	SENSOR_ATTR(temp2_input, 0444, temp_input_show, NULL, 1),

	SENSOR_ATTR(temp2_crit, 0444, temp_crit_show, NULL, 1),

	SENSOR_ATTR(temp3_input, 0444, temp_input_show, NULL, 2),

	SENSOR_ATTR(temp3_crit, 0444, temp_crit_show, NULL, 2),

	SENSOR_ATTR(temp4_input, 0444, temp_input_show, NULL, 3),

	SENSOR_ATTR(temp4_crit, 0444, temp_crit_show, NULL, 3),

	SENSOR_ATTR(temp5_input, 0444, temp_input_show, NULL, 4),

	SENSOR_ATTR(temp5_crit, 0444, temp_crit_show, NULL, 4),

	SENSOR_ATTR(temp6_input, 0444, temp_input_show, NULL, 5),

	SENSOR_ATTR(temp6_crit, 0444, temp_crit_show, NULL, 5),

	SENSOR_ATTR(temp7_input, 0444, temp_input_show, NULL, 6),

	SENSOR_ATTR(temp7_crit, 0444, temp_crit_show, NULL, 6),

	SENSOR_ATTR(temp8_input, 0444, temp_input_show, NULL, 7),

	SENSOR_ATTR(temp8_crit, 0444, temp_crit_show, NULL, 7),

	SENSOR_ATTR(temp9_input, 0444, temp_input_show, NULL, 8),

	SENSOR_ATTR(temp9_crit, 0444, temp_crit_show, NULL, 8),

	SENSOR_ATTR(temp10_input, 0444, temp_input_show, NULL, 9),

	SENSOR_ATTR(temp10_crit, 0444, temp_crit_show, NULL, 9),

};



/* thermal zone sys I/F */



#define to_thermal_zone(_dev) \

	container_of(_dev, struct thermal_zone_device, device)
@@ -214,7 +279,7 @@ do { \ 
	device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]);	\

} while (0)



/* sys I/F for cooling device */

/* cooling device sys I/F */

#define to_cooling_device(_dev)	\

	container_of(_dev, struct thermal_cooling_device, device)
@@ -447,6 +512,9 @@ struct thermal_cooling_device *thermal_cooling_device_register(char *type, 
	struct thermal_zone_device *pos;

	int result;



	if (!type)

		return ERR_PTR(-EINVAL);



	if (strlen(type) >= THERMAL_NAME_LENGTH)

		return ERR_PTR(-EINVAL);
@@ -477,11 +545,9 @@ struct thermal_cooling_device *thermal_cooling_device_register(char *type, 
	}



	/* sys I/F */

	if (type) {

	result = device_create_file(&cdev->device, &dev_attr_cdev_type);

	if (result)

		goto unregister;

	}



	result = device_create_file(&cdev->device, &dev_attr_max_state);

	if (result)
@@ -547,7 +613,7 @@ void thermal_cooling_device_unregister(struct 
		tz->ops->unbind(tz, cdev);

	}

	mutex_unlock(&thermal_list_lock);

	if (cdev->type[0])



	device_remove_file(&cdev->device, &dev_attr_cdev_type);

	device_remove_file(&cdev->device, &dev_attr_max_state);

	device_remove_file(&cdev->device, &dev_attr_cur_state);
@@ -580,6 +646,9 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, 
	int result;

	int count;



	if (!type)

		return ERR_PTR(-EINVAL);



	if (strlen(type) >= THERMAL_NAME_LENGTH)

		return ERR_PTR(-EINVAL);
@@ -601,6 +670,13 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, 
		kfree(tz);

		return ERR_PTR(result);

	}

	if (tz->id >= MAX_THERMAL_ZONES) {

		printk(KERN_ERR PREFIX

			"Too many thermal zones\n");

		release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);

		kfree(tz);

		return ERR_PTR(-EINVAL);

	}



	strcpy(tz->type, type);

	tz->ops = ops;
@@ -615,12 +691,27 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, 
		return ERR_PTR(result);

	}



	/* hwmon sys I/F */

	result = device_create_file(thermal_hwmon,

					&sensor_attrs[tz->id * 2].dev_attr);

	if (result)

		goto unregister;



	if (trips > 0) {

		char buf[40];

		result = tz->ops->get_trip_type(tz, 0, buf);

		if (result > 0 && !strcmp(buf, "critical\n")) {

			result = device_create_file(thermal_hwmon,

					&sensor_attrs[tz->id * 2 + 1].dev_attr);

			if (result)

				goto unregister;

		}

	}



	/* sys I/F */

	if (type) {

	result = device_create_file(&tz->device, &dev_attr_type);

	if (result)

		goto unregister;

	}



	result = device_create_file(&tz->device, &dev_attr_temp);

	if (result)
@@ -687,7 +778,16 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) 
		    tz->ops->unbind(tz, cdev);

	mutex_unlock(&thermal_list_lock);



	if (tz->type[0])

	device_remove_file(thermal_hwmon,

				&sensor_attrs[tz->id * 2].dev_attr);

	if (tz->trips > 0) {

		char buf[40];

		if (tz->ops->get_trip_type(tz, 0, buf) > 0)

			if (!strcmp(buf, "critical\n"))

				device_remove_file(thermal_hwmon,

				&sensor_attrs[tz->id * 2 + 1].dev_attr);

	}



	device_remove_file(&tz->device, &dev_attr_type);

	device_remove_file(&tz->device, &dev_attr_temp);

	if (tz->ops->get_mode)
@@ -705,6 +805,19 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) 


EXPORT_SYMBOL(thermal_zone_device_unregister);



static void thermal_exit(void)

{

	if (thermal_hwmon) {

		device_remove_file(thermal_hwmon, &dev_attr_name);

		hwmon_device_unregister(thermal_hwmon);

	}

	class_unregister(&thermal_class);

	idr_destroy(&thermal_tz_idr);

	idr_destroy(&thermal_cdev_idr);

	mutex_destroy(&thermal_idr_lock);

	mutex_destroy(&thermal_list_lock);

}



static int __init thermal_init(void)

{

	int result = 0;
@@ -716,16 +829,20 @@ static int __init thermal_init(void) 
		mutex_destroy(&thermal_idr_lock);

		mutex_destroy(&thermal_list_lock);

	}



	thermal_hwmon = hwmon_device_register(NULL);

	if (IS_ERR(thermal_hwmon)) {

		result = PTR_ERR(thermal_hwmon);

		thermal_hwmon = NULL;

		printk(KERN_ERR PREFIX

			"unable to register hwmon device\n");

		thermal_exit();

		return result;

	}



static void __exit thermal_exit(void)

{

	class_unregister(&thermal_class);

	idr_destroy(&thermal_tz_idr);

	idr_destroy(&thermal_cdev_idr);

	mutex_destroy(&thermal_idr_lock);

	mutex_destroy(&thermal_list_lock);

	result = device_create_file(thermal_hwmon, &dev_attr_name);



	return result;

}



subsys_initcall(thermal_init);