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Commit 1cc807a2 authored by Durgadoss R's avatar Durgadoss R Committed by Zhang Rui
Browse files

Thermal: Add a thermal notifier for user space 



This patch registers a governor which will let the
user land manage the platform thermals. Whenever a
trip happens, this governor just notifies the user
space using kobj_uevent().

Signed-off-by: default avatarDurgadoss R <durgadoss.r@intel.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent e151a202

drivers/thermal/Kconfig

+6 −0
Original line number Original line Diff line number Diff line
@@ -67,3 +67,9 @@ config STEP_WISE 
	depends on THERMAL

	depends on THERMAL

	help

	help

	  Enable this to manage platform thermals using a simple linear

	  Enable this to manage platform thermals using a simple linear



config USER_SPACE

	bool "User_space thermal governor"

	depends on THERMAL

	help

	  Enable this to let the user space manage the platform thermals.

drivers/thermal/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -9,3 +9,4 @@ obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o 
obj-$(CONFIG_EXYNOS_THERMAL)		+= exynos_thermal.o

obj-$(CONFIG_EXYNOS_THERMAL)		+= exynos_thermal.o

obj-$(CONFIG_FAIR_SHARE)		+= fair_share.o

obj-$(CONFIG_FAIR_SHARE)		+= fair_share.o

obj-$(CONFIG_STEP_WISE)			+= step_wise.o

obj-$(CONFIG_STEP_WISE)			+= step_wise.o

obj-$(CONFIG_USER_SPACE)		+= user_space.o

drivers/thermal/user_space.c

0 → 100644
+68 −0
Original line number Original line Diff line number Diff line 
/*

 *  user_space.c - A simple user space Thermal events notifier

 *

 *  Copyright (C) 2012 Intel Corp

 *  Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.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; version 2 of the License.

 *

 *  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.

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 */



#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt



#include <linux/module.h>

#include <linux/thermal.h>



#include "thermal_core.h"



/**

 * notify_user_space - Notifies user space about thermal events

 * @tz - thermal_zone_device

 *

 * This function notifies the user space through UEvents.

 */

int notify_user_space(struct thermal_zone_device *tz, int trip)

{

	mutex_lock(&tz->lock);

	kobject_uevent(&tz->device.kobj, KOBJ_CHANGE);

	mutex_unlock(&tz->lock);

	return 0;

}



struct thermal_governor thermal_gov_user_space = {

	.name		= "user_space",

	.throttle	= notify_user_space,

	.owner		= THIS_MODULE,

};



static int __init thermal_gov_user_space_init(void)

{

	return thermal_register_governor(&thermal_gov_user_space);

}



static void __exit thermal_gov_user_space_exit(void)

{

	thermal_unregister_governor(&thermal_gov_user_space);

}



/* This should load after thermal framework */

fs_initcall(thermal_gov_user_space_init);

module_exit(thermal_gov_user_space_exit);



MODULE_AUTHOR("Durgadoss R");

MODULE_DESCRIPTION("A user space Thermal notifier");

MODULE_LICENSE("GPL");