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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* ACPI fan device IDs are shared between the fan driver and the device power
* management code.
*
* Add new device IDs before the generic ACPI fan one.
*/
#ifndef _ACPI_FAN_H_
#define _ACPI_FAN_H_
#include <linux/kconfig.h>
#include <linux/limits.h>
#define ACPI_FAN_DEVICE_IDS \
{"INT3404", }, /* Fan */ \
{"INTC1044", }, /* Fan for Tiger Lake generation */ \
{"INTC1048", }, /* Fan for Alder Lake generation */ \
{"INTC1063", }, /* Fan for Meteor Lake generation */ \
{"INTC106A", }, /* Fan for Lunar Lake generation */ \
{"INTC10A2", }, /* Fan for Raptor Lake generation */ \
{"INTC10D6", }, /* Fan for Panther Lake generation */ \
{"INTC10FE", }, /* Fan for Wildcat Lake generation */ \
{"INTC10F5", }, /* Fan for Nova Lake generation */ \
{"PNP0C0B", } /* Generic ACPI fan */
#define ACPI_FPS_NAME_LEN 20
struct acpi_fan_fps {
u64 control;
u64 trip_point;
u64 speed;
u64 noise_level;
u64 power;
char name[ACPI_FPS_NAME_LEN];
struct device_attribute dev_attr;
};
struct acpi_fan_fif {
u8 revision;
u8 fine_grain_ctrl;
u8 step_size;
u8 low_speed_notification;
};
struct acpi_fan_fst {
u64 revision;
u64 control;
u64 speed;
};
struct acpi_fan {
acpi_handle handle;
bool acpi4;
bool has_fst;
struct acpi_fan_fif fif;
struct acpi_fan_fps *fps;
int fps_count;
/* A value of 0 means that trippoint-related functions are not supported */
u32 fan_trip_granularity;
#if IS_REACHABLE(CONFIG_HWMON)
struct device *hdev;
#endif
struct thermal_cooling_device *cdev;
struct device_attribute fst_speed;
struct device_attribute fine_grain_control;
};
/**
* acpi_fan_speed_valid - Check if fan speed value is valid
* @speeed: Speed value returned by the ACPI firmware
*
* Check if the fan speed value returned by the ACPI firmware is valid. This function is
* necessary as ACPI firmware implementations can return 0xFFFFFFFF to signal that the
* ACPI fan does not support speed reporting. Additionally, some buggy ACPI firmware
* implementations return a value larger than the 32-bit integer value defined by
* the ACPI specification when using placeholder values. Such invalid values are also
* detected by this function.
*
* Returns: True if the fan speed value is valid, false otherwise.
*/
static inline bool acpi_fan_speed_valid(u64 speed)
{
return speed < U32_MAX;
}
/**
* acpi_fan_power_valid - Check if fan power value is valid
* @power: Power value returned by the ACPI firmware
*
* Check if the fan power value returned by the ACPI firmware is valid.
* See acpi_fan_speed_valid() for details.
*
* Returns: True if the fan power value is valid, false otherwise.
*/
static inline bool acpi_fan_power_valid(u64 power)
{
return power < U32_MAX;
}
int acpi_fan_get_fst(acpi_handle handle, struct acpi_fan_fst *fst);
int acpi_fan_create_attributes(struct acpi_device *device);
void acpi_fan_delete_attributes(struct acpi_device *device);
#if IS_REACHABLE(CONFIG_HWMON)
int devm_acpi_fan_create_hwmon(struct device *dev);
void acpi_fan_notify_hwmon(struct device *dev);
#else
static inline int devm_acpi_fan_create_hwmon(struct device *dev) { return 0; };
static inline void acpi_fan_notify_hwmon(struct device *dev) { };
#endif
#endif
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