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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* hwmon interface for the ACPI Fan driver.
*
* Copyright (C) 2024 Armin Wolf <W_Armin@gmx.de>
*/
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/limits.h>
#include <linux/types.h>
#include <linux/units.h>
#include "fan.h"
/* Returned when the ACPI fan does not support speed reporting */
#define FAN_SPEED_UNAVAILABLE U32_MAX
#define FAN_POWER_UNAVAILABLE U32_MAX
static struct acpi_fan_fps *acpi_fan_get_current_fps(struct acpi_fan *fan, u64 control)
{
unsigned int i;
for (i = 0; i < fan->fps_count; i++) {
if (fan->fps[i].control == control)
return &fan->fps[i];
}
return NULL;
}
static umode_t acpi_fan_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct acpi_fan *fan = drvdata;
unsigned int i;
switch (type) {
case hwmon_fan:
switch (attr) {
case hwmon_fan_input:
return 0444;
case hwmon_fan_target:
/* Only acpi4 fans support fan control. */
if (!fan->acpi4)
return 0;
/*
* When in fine grain control mode, not every fan control value
* has an associated fan performance state.
*/
if (fan->fif.fine_grain_ctrl)
return 0;
return 0444;
default:
return 0;
}
case hwmon_power:
switch (attr) {
case hwmon_power_input:
/* Only acpi4 fans support fan control. */
if (!fan->acpi4)
return 0;
/*
* When in fine grain control mode, not every fan control value
* has an associated fan performance state.
*/
if (fan->fif.fine_grain_ctrl)
return 0;
/*
* When all fan performance states contain no valid power data,
* when the associated attribute should not be created.
*/
for (i = 0; i < fan->fps_count; i++) {
if (fan->fps[i].power != FAN_POWER_UNAVAILABLE)
return 0444;
}
return 0;
default:
return 0;
}
default:
return 0;
}
}
static int acpi_fan_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
int channel, long *val)
{
struct acpi_fan *fan = dev_get_drvdata(dev);
struct acpi_fan_fps *fps;
struct acpi_fan_fst fst;
int ret;
ret = acpi_fan_get_fst(fan->handle, &fst);
if (ret < 0)
return ret;
switch (type) {
case hwmon_fan:
switch (attr) {
case hwmon_fan_input:
if (fst.speed == FAN_SPEED_UNAVAILABLE)
return -ENODEV;
if (fst.speed > LONG_MAX)
return -EOVERFLOW;
*val = fst.speed;
return 0;
case hwmon_fan_target:
fps = acpi_fan_get_current_fps(fan, fst.control);
if (!fps)
return -EIO;
if (fps->speed > LONG_MAX)
return -EOVERFLOW;
*val = fps->speed;
return 0;
default:
return -EOPNOTSUPP;
}
case hwmon_power:
switch (attr) {
case hwmon_power_input:
fps = acpi_fan_get_current_fps(fan, fst.control);
if (!fps)
return -EIO;
if (fps->power == FAN_POWER_UNAVAILABLE)
return -ENODEV;
if (fps->power > LONG_MAX / MICROWATT_PER_MILLIWATT)
return -EOVERFLOW;
*val = fps->power * MICROWATT_PER_MILLIWATT;
return 0;
default:
return -EOPNOTSUPP;
}
default:
return -EOPNOTSUPP;
}
}
static const struct hwmon_ops acpi_fan_hwmon_ops = {
.is_visible = acpi_fan_hwmon_is_visible,
.read = acpi_fan_hwmon_read,
};
static const struct hwmon_channel_info * const acpi_fan_hwmon_info[] = {
HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET),
HWMON_CHANNEL_INFO(power, HWMON_P_INPUT),
NULL
};
static const struct hwmon_chip_info acpi_fan_hwmon_chip_info = {
.ops = &acpi_fan_hwmon_ops,
.info = acpi_fan_hwmon_info,
};
int devm_acpi_fan_create_hwmon(struct device *dev)
{
struct acpi_fan *fan = dev_get_drvdata(dev);
struct device *hdev;
hdev = devm_hwmon_device_register_with_info(dev, "acpi_fan", fan, &acpi_fan_hwmon_chip_info,
NULL);
return PTR_ERR_OR_ZERO(hdev);
}
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