1 /* 2 * devfreq_cooling: Thermal cooling device implementation for devices using 3 * devfreq 4 * 5 * Copyright (C) 2014-2015 ARM Limited 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 12 * kind, whether express or implied; without even the implied warranty 13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #ifndef __DEVFREQ_COOLING_H__ 18 #define __DEVFREQ_COOLING_H__ 19 20 #include <linux/devfreq.h> 21 #include <linux/thermal.h> 22 23 #ifdef CONFIG_DEVFREQ_THERMAL 24 25 /** 26 * struct devfreq_cooling_power - Devfreq cooling power ops 27 * @get_static_power: Take voltage, in mV, and return the static power 28 * in mW. If NULL, the static power is assumed 29 * to be 0. 30 * @get_dynamic_power: Take voltage, in mV, and frequency, in HZ, and 31 * return the dynamic power draw in mW. If NULL, 32 * a simple power model is used. 33 * @dyn_power_coeff: Coefficient for the simple dynamic power model in 34 * mW/(MHz mV mV). 35 * If get_dynamic_power() is NULL, then the 36 * dynamic power is calculated as 37 * @dyn_power_coeff * frequency * voltage^2 38 */ 39 struct devfreq_cooling_power { 40 unsigned long (*get_static_power)(unsigned long voltage); 41 unsigned long (*get_dynamic_power)(unsigned long freq, 42 unsigned long voltage); 43 unsigned long dyn_power_coeff; 44 }; 45 46 struct thermal_cooling_device * 47 of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, 48 struct devfreq_cooling_power *dfc_power); 49 struct thermal_cooling_device * 50 of_devfreq_cooling_register(struct device_node *np, struct devfreq *df); 51 struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df); 52 void devfreq_cooling_unregister(struct thermal_cooling_device *dfc); 53 54 #else /* !CONFIG_DEVFREQ_THERMAL */ 55 56 struct thermal_cooling_device * 57 of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, 58 struct devfreq_cooling_power *dfc_power) 59 { 60 return ERR_PTR(-EINVAL); 61 } 62 63 static inline struct thermal_cooling_device * 64 of_devfreq_cooling_register(struct device_node *np, struct devfreq *df) 65 { 66 return ERR_PTR(-EINVAL); 67 } 68 69 static inline struct thermal_cooling_device * 70 devfreq_cooling_register(struct devfreq *df) 71 { 72 return ERR_PTR(-EINVAL); 73 } 74 75 static inline void 76 devfreq_cooling_unregister(struct thermal_cooling_device *dfc) 77 { 78 } 79 80 #endif /* CONFIG_DEVFREQ_THERMAL */ 81 #endif /* __DEVFREQ_COOLING_H__ */ 82