503ccc3fec
The documentation of of_cpufreq_cooling_register() and cpufreq_cooling_register() say that they return ERR_PTR() on error. Accordingly, callers only check for IS_ERR(). Therefore, make them return ERR_PTR(-ENOSYS) as is customary in the kernel when config options are missing. Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/*
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* linux/include/linux/cpu_cooling.h
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*
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* Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
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* Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org>
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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 __CPU_COOLING_H__
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#define __CPU_COOLING_H__
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#include <linux/of.h>
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#include <linux/thermal.h>
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#include <linux/cpumask.h>
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#ifdef CONFIG_CPU_THERMAL
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/**
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* cpufreq_cooling_register - function to create cpufreq cooling device.
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* @clip_cpus: cpumask of cpus where the frequency constraints will happen
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*/
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struct thermal_cooling_device *
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cpufreq_cooling_register(const struct cpumask *clip_cpus);
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/**
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* of_cpufreq_cooling_register - create cpufreq cooling device based on DT.
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* @np: a valid struct device_node to the cooling device device tree node.
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* @clip_cpus: cpumask of cpus where the frequency constraints will happen
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*/
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#ifdef CONFIG_THERMAL_OF
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struct thermal_cooling_device *
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of_cpufreq_cooling_register(struct device_node *np,
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const struct cpumask *clip_cpus);
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#else
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static inline struct thermal_cooling_device *
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of_cpufreq_cooling_register(struct device_node *np,
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const struct cpumask *clip_cpus)
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{
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return ERR_PTR(-ENOSYS);
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}
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#endif
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/**
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* cpufreq_cooling_unregister - function to remove cpufreq cooling device.
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* @cdev: thermal cooling device pointer.
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*/
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void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev);
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unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq);
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#else /* !CONFIG_CPU_THERMAL */
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static inline struct thermal_cooling_device *
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cpufreq_cooling_register(const struct cpumask *clip_cpus)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct thermal_cooling_device *
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of_cpufreq_cooling_register(struct device_node *np,
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const struct cpumask *clip_cpus)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline
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void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
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{
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return;
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}
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static inline
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unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
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{
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return THERMAL_CSTATE_INVALID;
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}
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#endif /* CONFIG_CPU_THERMAL */
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#endif /* __CPU_COOLING_H__ */
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