mirror of
https://github.com/torvalds/linux.git
synced 2024-12-15 07:33:56 +00:00
e4dbf98f7f
The bang-bang thermal governor uses a hysteresis to switch abruptly on or off a cooling device. It is intended to control fans, which can not be throttled but just switched on or off. Bang-bang cannot be set as default governor as it is intended for special devices only. For those special devices the driver needs to explicitely request it. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Andreas Mohr <andi@lisas.de> Cc: Borislav Petkov <bp@suse.de> Cc: Javi Merino <javi.merino@arm.com> Cc: linux-pm@vger.kernel.org Signed-off-by: Peter Feuerer <peter@piie.net> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/*
|
|
* thermal_core.h
|
|
*
|
|
* Copyright (C) 2012 Intel Corp
|
|
* Author: 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.
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
|
|
#ifndef __THERMAL_CORE_H__
|
|
#define __THERMAL_CORE_H__
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/thermal.h>
|
|
|
|
/* Initial state of a cooling device during binding */
|
|
#define THERMAL_NO_TARGET -1UL
|
|
|
|
/*
|
|
* This structure is used to describe the behavior of
|
|
* a certain cooling device on a certain trip point
|
|
* in a certain thermal zone
|
|
*/
|
|
struct thermal_instance {
|
|
int id;
|
|
char name[THERMAL_NAME_LENGTH];
|
|
struct thermal_zone_device *tz;
|
|
struct thermal_cooling_device *cdev;
|
|
int trip;
|
|
unsigned long upper; /* Highest cooling state for this trip point */
|
|
unsigned long lower; /* Lowest cooling state for this trip point */
|
|
unsigned long target; /* expected cooling state */
|
|
char attr_name[THERMAL_NAME_LENGTH];
|
|
struct device_attribute attr;
|
|
struct list_head tz_node; /* node in tz->thermal_instances */
|
|
struct list_head cdev_node; /* node in cdev->thermal_instances */
|
|
};
|
|
|
|
int thermal_register_governor(struct thermal_governor *);
|
|
void thermal_unregister_governor(struct thermal_governor *);
|
|
|
|
#ifdef CONFIG_THERMAL_GOV_STEP_WISE
|
|
int thermal_gov_step_wise_register(void);
|
|
void thermal_gov_step_wise_unregister(void);
|
|
#else
|
|
static inline int thermal_gov_step_wise_register(void) { return 0; }
|
|
static inline void thermal_gov_step_wise_unregister(void) {}
|
|
#endif /* CONFIG_THERMAL_GOV_STEP_WISE */
|
|
|
|
#ifdef CONFIG_THERMAL_GOV_FAIR_SHARE
|
|
int thermal_gov_fair_share_register(void);
|
|
void thermal_gov_fair_share_unregister(void);
|
|
#else
|
|
static inline int thermal_gov_fair_share_register(void) { return 0; }
|
|
static inline void thermal_gov_fair_share_unregister(void) {}
|
|
#endif /* CONFIG_THERMAL_GOV_FAIR_SHARE */
|
|
|
|
#ifdef CONFIG_THERMAL_GOV_BANG_BANG
|
|
int thermal_gov_bang_bang_register(void);
|
|
void thermal_gov_bang_bang_unregister(void);
|
|
#else
|
|
static inline int thermal_gov_bang_bang_register(void) { return 0; }
|
|
static inline void thermal_gov_bang_bang_unregister(void) {}
|
|
#endif /* CONFIG_THERMAL_GOV_BANG_BANG */
|
|
|
|
#ifdef CONFIG_THERMAL_GOV_USER_SPACE
|
|
int thermal_gov_user_space_register(void);
|
|
void thermal_gov_user_space_unregister(void);
|
|
#else
|
|
static inline int thermal_gov_user_space_register(void) { return 0; }
|
|
static inline void thermal_gov_user_space_unregister(void) {}
|
|
#endif /* CONFIG_THERMAL_GOV_USER_SPACE */
|
|
|
|
/* device tree support */
|
|
#ifdef CONFIG_THERMAL_OF
|
|
int of_parse_thermal_zones(void);
|
|
void of_thermal_destroy_zones(void);
|
|
#else
|
|
static inline int of_parse_thermal_zones(void) { return 0; }
|
|
static inline void of_thermal_destroy_zones(void) { }
|
|
#endif
|
|
|
|
#endif /* __THERMAL_CORE_H__ */
|