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