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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef ACPI_ACPIGEN_DPTF_H
#define ACPI_ACPIGEN_DPTF_H
#include <device/device.h>
#include <stdbool.h>
/* A common idiom is to use a default value if none is provided (i.e., == 0) */
#define DEFAULT_IF_0(thing, default_) ((thing) ? (thing) : (default_))
/* List of available participants (i.e., they can participate in policies) */
enum dptf_participant {
DPTF_NONE,
DPTF_CPU,
DPTF_CHARGER,
DPTF_FAN,
DPTF_TEMP_SENSOR_0,
DPTF_TEMP_SENSOR_1,
DPTF_TEMP_SENSOR_2,
DPTF_TEMP_SENSOR_3,
DPTF_PARTICIPANT_COUNT,
};
/* DPTF compile-time constants */
enum {
/* A device can only define _AC0 .. _AC9 i.e. between 0 and 10 Active Cooling Methods */
DPTF_MAX_ACX = 10,
DPTF_MAX_ACTIVE_POLICIES = (DPTF_PARTICIPANT_COUNT-1),
};
/* Active Policy */
struct dptf_active_policy {
/* Device capable of being affected by the fan */
enum dptf_participant target;
/* Source's contribution to the Target's cooling capability as a percentage */
uint8_t weight;
/* When target reaches temperature 'temp', the source will turn on at 'fan_pct' % */
struct {
/* (degrees C) */
uint8_t temp;
/* 0 - 100 */
uint8_t fan_pct;
} thresholds[DPTF_MAX_ACX];
};
/*
* This function provides tables of temperature and corresponding fan or percent. When the
* temperature thresholds are met (_AC0 - _AC9), the fan is driven to corresponding percentage
* of full speed.
*/
void dptf_write_active_policies(const struct dptf_active_policy *policies, int max_count);
/* Helper method to open the scope for a given participant. */
void dptf_write_scope(enum dptf_participant participant);
/*
* Write out a _STA that will check the value of the DPTE field in GNVS, and return 0xF if DPTE
* is 1, otherwise it will return 0.
*/
void dptf_write_STA(void);
#endif /* ACPI_ACPIGEN_DPTF_H */
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