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kernel/linux-imx6_3.14.28/include/linux/cpu_cooling.h 2.78 KB
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  /*
   *  linux/include/linux/cpu_cooling.h
   *
   *  Copyright (C) 2012	Samsung Electronics Co., Ltd(http://www.samsung.com)
   *  Copyright (C) 2012  Amit Daniel <amit.kachhap@linaro.org>
   *
   * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   *  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 __CPU_COOLING_H__
  #define __CPU_COOLING_H__
  
  #include <linux/of.h>
  #include <linux/thermal.h>
  #include <linux/cpumask.h>
  
  #ifdef CONFIG_CPU_THERMAL
  /**
   * cpufreq_cooling_register - function to create cpufreq cooling device.
   * @clip_cpus: cpumask of cpus where the frequency constraints will happen
   */
  struct thermal_cooling_device *
  cpufreq_cooling_register(const struct cpumask *clip_cpus);
  
  /**
   * of_cpufreq_cooling_register - create cpufreq cooling device based on DT.
   * @np: a valid struct device_node to the cooling device device tree node.
   * @clip_cpus: cpumask of cpus where the frequency constraints will happen
   */
  #ifdef CONFIG_THERMAL_OF
  struct thermal_cooling_device *
  of_cpufreq_cooling_register(struct device_node *np,
  			    const struct cpumask *clip_cpus);
  #else
  static inline struct thermal_cooling_device *
  of_cpufreq_cooling_register(struct device_node *np,
  			    const struct cpumask *clip_cpus)
  {
  	return NULL;
  }
  #endif
  
  /**
   * cpufreq_cooling_unregister - function to remove cpufreq cooling device.
   * @cdev: thermal cooling device pointer.
   */
  void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev);
  
  unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq);
  #else /* !CONFIG_CPU_THERMAL */
  static inline struct thermal_cooling_device *
  cpufreq_cooling_register(const struct cpumask *clip_cpus)
  {
  	return NULL;
  }
  static inline struct thermal_cooling_device *
  of_cpufreq_cooling_register(struct device_node *np,
  			    const struct cpumask *clip_cpus)
  {
  	return NULL;
  }
  static inline
  void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
  {
  	return;
  }
  static inline
  unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
  {
  	return THERMAL_CSTATE_INVALID;
  }
  #endif	/* CONFIG_CPU_THERMAL */
  
  #endif /* __CPU_COOLING_H__ */