diff options
Diffstat (limited to 'include/linux/devfreq_cooling.h')
-rw-r--r-- | include/linux/devfreq_cooling.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/include/linux/devfreq_cooling.h b/include/linux/devfreq_cooling.h new file mode 100644 index 000000000..14baa73fc --- /dev/null +++ b/include/linux/devfreq_cooling.h @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * devfreq_cooling: Thermal cooling device implementation for devices using + * devfreq + * + * Copyright (C) 2014-2015 ARM Limited + * + */ + +#ifndef __DEVFREQ_COOLING_H__ +#define __DEVFREQ_COOLING_H__ + +#include <linux/devfreq.h> +#include <linux/thermal.h> + + +/** + * struct devfreq_cooling_power - Devfreq cooling power ops + * @get_real_power: When this is set, the framework uses it to ask the + * device driver for the actual power. + * Some devices have more sophisticated methods + * (like power counters) to approximate the actual power + * that they use. + * This function provides more accurate data to the + * thermal governor. When the driver does not provide + * such function, framework just uses pre-calculated + * table and scale the power by 'utilization' + * (based on 'busy_time' and 'total_time' taken from + * devfreq 'last_status'). + * The value returned by this function must be lower + * or equal than the maximum power value + * for the current state + * (which can be found in power_table[state]). + * When this interface is used, the power_table holds + * max total (static + dynamic) power value for each OPP. + */ +struct devfreq_cooling_power { + int (*get_real_power)(struct devfreq *df, u32 *power, + unsigned long freq, unsigned long voltage); +}; + +#ifdef CONFIG_DEVFREQ_THERMAL + +struct thermal_cooling_device * +of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, + struct devfreq_cooling_power *dfc_power); +struct thermal_cooling_device * +of_devfreq_cooling_register(struct device_node *np, struct devfreq *df); +struct thermal_cooling_device *devfreq_cooling_register(struct devfreq *df); +void devfreq_cooling_unregister(struct thermal_cooling_device *dfc); +struct thermal_cooling_device * +devfreq_cooling_em_register(struct devfreq *df, + struct devfreq_cooling_power *dfc_power); + +#else /* !CONFIG_DEVFREQ_THERMAL */ + +static inline struct thermal_cooling_device * +of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df, + struct devfreq_cooling_power *dfc_power) +{ + return ERR_PTR(-EINVAL); +} + +static inline struct thermal_cooling_device * +of_devfreq_cooling_register(struct device_node *np, struct devfreq *df) +{ + return ERR_PTR(-EINVAL); +} + +static inline struct thermal_cooling_device * +devfreq_cooling_register(struct devfreq *df) +{ + return ERR_PTR(-EINVAL); +} + +static inline struct thermal_cooling_device * +devfreq_cooling_em_register(struct devfreq *df, + struct devfreq_cooling_power *dfc_power) +{ + return ERR_PTR(-EINVAL); +} + +static inline void +devfreq_cooling_unregister(struct thermal_cooling_device *dfc) +{ +} + +#endif /* CONFIG_DEVFREQ_THERMAL */ +#endif /* __DEVFREQ_COOLING_H__ */ |