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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* fan_attr.c - Create extra attributes for ACPI Fan driver
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2022 Intel Corporation. All rights reserved.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include "fan.h"
MODULE_LICENSE("GPL");
static ssize_t show_state(struct device *dev, struct device_attribute *attr, char *buf)
{
struct acpi_fan_fps *fps = container_of(attr, struct acpi_fan_fps, dev_attr);
int count;
if (fps->control == 0xFFFFFFFF || fps->control > 100)
count = scnprintf(buf, PAGE_SIZE, "not-defined:");
else
count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);
if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
count += sysfs_emit_at(buf, count, "not-defined:");
else
count += sysfs_emit_at(buf, count, "%lld:", fps->trip_point);
if (fps->speed == 0xFFFFFFFF)
count += sysfs_emit_at(buf, count, "not-defined:");
else
count += sysfs_emit_at(buf, count, "%lld:", fps->speed);
if (fps->noise_level == 0xFFFFFFFF)
count += sysfs_emit_at(buf, count, "not-defined:");
else
count += sysfs_emit_at(buf, count, "%lld:", fps->noise_level * 100);
if (fps->power == 0xFFFFFFFF)
count += sysfs_emit_at(buf, count, "not-defined\n");
else
count += sysfs_emit_at(buf, count, "%lld\n", fps->power);
return count;
}
static ssize_t show_fan_speed(struct device *dev, struct device_attribute *attr, char *buf)
{
struct acpi_device *acpi_dev = container_of(dev, struct acpi_device, dev);
struct acpi_fan_fst fst;
int status;
status = acpi_fan_get_fst(acpi_dev, &fst);
if (status)
return status;
return sprintf(buf, "%lld\n", fst.speed);
}
static ssize_t show_fine_grain_control(struct device *dev, struct device_attribute *attr, char *buf)
{
struct acpi_device *acpi_dev = container_of(dev, struct acpi_device, dev);
struct acpi_fan *fan = acpi_driver_data(acpi_dev);
return sprintf(buf, "%d\n", fan->fif.fine_grain_ctrl);
}
int acpi_fan_create_attributes(struct acpi_device *device)
{
struct acpi_fan *fan = acpi_driver_data(device);
int i, status;
sysfs_attr_init(&fan->fine_grain_control.attr);
fan->fine_grain_control.show = show_fine_grain_control;
fan->fine_grain_control.store = NULL;
fan->fine_grain_control.attr.name = "fine_grain_control";
fan->fine_grain_control.attr.mode = 0444;
status = sysfs_create_file(&device->dev.kobj, &fan->fine_grain_control.attr);
if (status)
return status;
/* _FST is present if we are here */
sysfs_attr_init(&fan->fst_speed.attr);
fan->fst_speed.show = show_fan_speed;
fan->fst_speed.store = NULL;
fan->fst_speed.attr.name = "fan_speed_rpm";
fan->fst_speed.attr.mode = 0444;
status = sysfs_create_file(&device->dev.kobj, &fan->fst_speed.attr);
if (status)
goto rem_fine_grain_attr;
for (i = 0; i < fan->fps_count; ++i) {
struct acpi_fan_fps *fps = &fan->fps[i];
snprintf(fps->name, ACPI_FPS_NAME_LEN, "state%d", i);
sysfs_attr_init(&fps->dev_attr.attr);
fps->dev_attr.show = show_state;
fps->dev_attr.store = NULL;
fps->dev_attr.attr.name = fps->name;
fps->dev_attr.attr.mode = 0444;
status = sysfs_create_file(&device->dev.kobj, &fps->dev_attr.attr);
if (status) {
int j;
for (j = 0; j < i; ++j)
sysfs_remove_file(&device->dev.kobj, &fan->fps[j].dev_attr.attr);
goto rem_fst_attr;
}
}
return 0;
rem_fst_attr:
sysfs_remove_file(&device->dev.kobj, &fan->fst_speed.attr);
rem_fine_grain_attr:
sysfs_remove_file(&device->dev.kobj, &fan->fine_grain_control.attr);
return status;
}
void acpi_fan_delete_attributes(struct acpi_device *device)
{
struct acpi_fan *fan = acpi_driver_data(device);
int i;
for (i = 0; i < fan->fps_count; ++i)
sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
sysfs_remove_file(&device->dev.kobj, &fan->fst_speed.attr);
sysfs_remove_file(&device->dev.kobj, &fan->fine_grain_control.attr);
}
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