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Commit 05a83d97 authored by Zhang Rui's avatar Zhang Rui Committed by Len Brown
Browse files

ACPI: register ACPI Fan as generic thermal cooling device 



Register ACPI Fan as thermal cooling device.

Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarThomas Sujith <sujith.thomas@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent ce44e197

drivers/acpi/fan.c

+83 −7
Original line number Diff line number Diff line
@@ -30,7 +30,7 @@ 
#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include <asm/uaccess.h>



#include <linux/thermal.h>

#include <acpi/acpi_bus.h>

#include <acpi/acpi_drivers.h>
@@ -68,9 +68,55 @@ static struct acpi_driver acpi_fan_driver = { 
		},

};



/* thermal cooling device callbacks */

static int fan_get_max_state(struct thermal_cooling_device *cdev, char *buf)

{

	/* ACPI fan device only support two states: ON/OFF */

	return sprintf(buf, "1\n");

}



static int fan_get_cur_state(struct thermal_cooling_device *cdev, char *buf)

{

	struct acpi_device *device = cdev->devdata;

	int state;

	int result;



	if (!device)

		return -EINVAL;



	result = acpi_bus_get_power(device->handle, &state);

	if (result)

		return result;



	return sprintf(buf, "%s\n", state == ACPI_STATE_D3 ? "0" :

			 (state == ACPI_STATE_D0 ? "1" : "unknown"));

}



static int

fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned int state)

{

	struct acpi_device *device = cdev->devdata;

	int result;



	if (!device || (state != 0 && state != 1))

		return -EINVAL;



	result = acpi_bus_set_power(device->handle,

				state ? ACPI_STATE_D0 : ACPI_STATE_D3);



	return result;

}



static struct thermal_cooling_device_ops fan_cooling_ops = {

	.get_max_state = fan_get_max_state,

	.get_cur_state = fan_get_cur_state,

	.set_cur_state = fan_set_cur_state,

};



/* --------------------------------------------------------------------------

                              FS Interface (/proc)

   -------------------------------------------------------------------------- */

#ifdef CONFIG_ACPI_PROCFS



static struct proc_dir_entry *acpi_fan_dir;
@@ -171,7 +217,17 @@ static int acpi_fan_remove_fs(struct acpi_device *device) 


	return 0;

}

#else

static int acpi_fan_add_fs(struct acpi_device *device)

{

	return 0;

}



static int acpi_fan_remove_fs(struct acpi_device *device)

{

	return 0;

}

#endif

/* --------------------------------------------------------------------------

                                 Driver Interface

   -------------------------------------------------------------------------- */
@@ -179,9 +235,8 @@ static int acpi_fan_remove_fs(struct acpi_device *device) 
static int acpi_fan_add(struct acpi_device *device)

{

	int result = 0;

	struct acpi_fan *fan = NULL;

	int state = 0;



	struct thermal_cooling_device *cdev;



	if (!device)

		return -EINVAL;
@@ -199,6 +254,25 @@ static int acpi_fan_add(struct acpi_device *device) 
	acpi_bus_set_power(device->handle, state);

	device->flags.force_power_state = 0;



	cdev = thermal_cooling_device_register("Fan", device,

						&fan_cooling_ops);

	if (cdev)

		printk(KERN_INFO PREFIX

			"%s is registered as cooling_device%d\n",

			device->dev.bus_id, cdev->id);

	else

		goto end;

	acpi_driver_data(device) = cdev;

	result = sysfs_create_link(&device->dev.kobj, &cdev->device.kobj,

					"thermal_cooling");

	if (result)

		return result;



	result = sysfs_create_link(&cdev->device.kobj, &device->dev.kobj,

                                       "device");

        if (result)

                return result;



	result = acpi_fan_add_fs(device);

	if (result)

		goto end;
@@ -208,18 +282,20 @@ static int acpi_fan_add(struct acpi_device *device) 
	       !device->power.state ? "on" : "off");



      end:

	if (result)

		kfree(fan);



	return result;

}



static int acpi_fan_remove(struct acpi_device *device, int type)

{

	if (!device || !acpi_driver_data(device))

	struct thermal_cooling_device *cdev = acpi_driver_data(device);



	if (!device || !cdev)

		return -EINVAL;



	acpi_fan_remove_fs(device);

	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");

	sysfs_remove_link(&cdev->device.kobj, "device");

	thermal_cooling_device_unregister(cdev);



	return 0;

}