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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
/*
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* thermal_core.h
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*
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* Copyright (C) 2012 Intel Corp
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* Author: Durgadoss R <durgadoss.r@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#ifndef __THERMAL_CORE_H__
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#define __THERMAL_CORE_H__
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#include <linux/device.h>
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#include <linux/thermal.h>
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/* Initial state of a cooling device during binding */
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#define THERMAL_NO_TARGET -1UL
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/*
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* This structure is used to describe the behavior of
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* a certain cooling device on a certain trip point
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* in a certain thermal zone
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*/
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struct thermal_instance {
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int id;
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char name[THERMAL_NAME_LENGTH];
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struct thermal_zone_device *tz;
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struct thermal_cooling_device *cdev;
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int trip;
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unsigned long upper; /* Highest cooling state for this trip point */
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unsigned long lower; /* Lowest cooling state for this trip point */
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unsigned long target; /* expected cooling state */
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char attr_name[THERMAL_NAME_LENGTH];
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struct device_attribute attr;
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struct list_head tz_node; /* node in tz->thermal_instances */
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struct list_head cdev_node; /* node in cdev->thermal_instances */
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};
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int thermal_register_governor(struct thermal_governor *);
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void thermal_unregister_governor(struct thermal_governor *);
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#ifdef CONFIG_THERMAL_GOV_STEP_WISE
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int thermal_gov_step_wise_register(void);
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void thermal_gov_step_wise_unregister(void);
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#else
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static inline int thermal_gov_step_wise_register(void) { return 0; }
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static inline void thermal_gov_step_wise_unregister(void) {}
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#endif /* CONFIG_THERMAL_GOV_STEP_WISE */
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#ifdef CONFIG_THERMAL_GOV_FAIR_SHARE
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int thermal_gov_fair_share_register(void);
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void thermal_gov_fair_share_unregister(void);
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#else
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static inline int thermal_gov_fair_share_register(void) { return 0; }
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static inline void thermal_gov_fair_share_unregister(void) {}
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#endif /* CONFIG_THERMAL_GOV_FAIR_SHARE */
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#ifdef CONFIG_THERMAL_GOV_BANG_BANG
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int thermal_gov_bang_bang_register(void);
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void thermal_gov_bang_bang_unregister(void);
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#else
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static inline int thermal_gov_bang_bang_register(void) { return 0; }
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static inline void thermal_gov_bang_bang_unregister(void) {}
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#endif /* CONFIG_THERMAL_GOV_BANG_BANG */
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#ifdef CONFIG_THERMAL_GOV_USER_SPACE
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int thermal_gov_user_space_register(void);
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void thermal_gov_user_space_unregister(void);
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#else
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static inline int thermal_gov_user_space_register(void) { return 0; }
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static inline void thermal_gov_user_space_unregister(void) {}
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#endif /* CONFIG_THERMAL_GOV_USER_SPACE */
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/* device tree support */
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#ifdef CONFIG_THERMAL_OF
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int of_parse_thermal_zones(void);
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void of_thermal_destroy_zones(void);
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#else
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static inline int of_parse_thermal_zones(void) { return 0; }
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static inline void of_thermal_destroy_zones(void) { }
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#endif
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#endif /* __THERMAL_CORE_H__ */
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