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// SPDX-License-Identifier: GPL-2.0
/*
* thermal_hwmon.c - Generic Thermal Management hwmon support.
*
* Code based on Intel thermal_core.c. Copyrights of the original code:
* Copyright (C) 2008 Intel Corp
* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
*
* Copyright (C) 2013 Texas Instruments
* Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.com>
*/
#include <linux/err.h>
#include <linux/export.h>
#include <linux/hwmon.h>
#include <linux/slab.h>
#include <linux/thermal.h>
#include "thermal_hwmon.h"
#include "thermal_core.h"
/*
* Needs to be large enough to hold a thermal zone type string followed by an
* underline character and a 32-bit integer in decimal representation.
*/
#define THERMAL_HWMON_NAME_LENGTH (THERMAL_NAME_LENGTH + 11)
/* hwmon sys I/F */
/* thermal zone devices with the same type share one hwmon device */
struct thermal_hwmon_device {
char name[THERMAL_HWMON_NAME_LENGTH];
struct device *device;
struct list_head node;
struct thermal_zone_device *tz;
};
static LIST_HEAD(thermal_hwmon_list);
static DEFINE_MUTEX(thermal_hwmon_list_lock);
static ssize_t
temp1_input_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
struct thermal_zone_device *tz = hwmon->tz;
int temperature;
int ret;
ret = thermal_zone_get_temp(tz, &temperature);
if (ret)
return ret;
return sysfs_emit(buf, "%d\n", temperature);
}
static ssize_t
temp1_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
struct thermal_zone_device *tz = hwmon->tz;
int temperature;
int ret;
guard(thermal_zone)(tz);
ret = tz->ops.get_crit_temp(tz, &temperature);
if (ret)
return ret;
return sysfs_emit(buf, "%d\n", temperature);
}
static DEVICE_ATTR_RO(temp1_input);
static DEVICE_ATTR_RO(temp1_crit);
static struct attribute *thermal_hwmon_attrs[] = {
&dev_attr_temp1_input.attr,
&dev_attr_temp1_crit.attr,
NULL,
};
static umode_t thermal_hwmon_attr_is_visible(struct kobject *kobj,
struct attribute *a, int n)
{
if (a == &dev_attr_temp1_input.attr)
return a->mode;
if (a == &dev_attr_temp1_crit.attr) {
struct thermal_hwmon_device *hwmon = dev_get_drvdata(kobj_to_dev(kobj));
struct thermal_zone_device *tz = hwmon->tz;
int dummy;
if (tz->ops.get_crit_temp && !tz->ops.get_crit_temp(tz, &dummy))
return a->mode;
}
return 0;
}
static const struct attribute_group thermal_hwmon_group = {
.attrs = thermal_hwmon_attrs,
.is_visible = thermal_hwmon_attr_is_visible,
};
__ATTRIBUTE_GROUPS(thermal_hwmon);
int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
hwmon = kzalloc_obj(*hwmon);
if (!hwmon)
return -ENOMEM;
hwmon->tz = tz;
/*
* Append the thermal zone ID preceded by an underline character to the
* type to disambiguate the sensors command output.
*/
scnprintf(hwmon->name, THERMAL_HWMON_NAME_LENGTH, "%s_%d", tz->type, tz->id);
strreplace(hwmon->name, '-', '_');
hwmon->device = hwmon_device_register_for_thermal(&tz->device,
hwmon->name, hwmon,
thermal_hwmon_groups);
if (IS_ERR(hwmon->device)) {
int result = PTR_ERR(hwmon->device);
kfree(hwmon);
return result;
}
/* The list is needed for hwmon lookup during removal. */
mutex_lock(&thermal_hwmon_list_lock);
list_add_tail(&hwmon->node, &thermal_hwmon_list);
mutex_unlock(&thermal_hwmon_list_lock);
return 0;
}
EXPORT_SYMBOL_GPL(thermal_add_hwmon_sysfs);
static struct thermal_hwmon_device *
thermal_hwmon_lookup(const struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
list_for_each_entry(hwmon, &thermal_hwmon_list, node) {
if (hwmon->tz == tz)
return hwmon;
}
return NULL;
}
void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
scoped_guard(mutex, &thermal_hwmon_list_lock) {
hwmon = thermal_hwmon_lookup(tz);
if (!hwmon)
return;
list_del(&hwmon->node);
}
hwmon_device_unregister(hwmon->device);
kfree(hwmon);
}
EXPORT_SYMBOL_GPL(thermal_remove_hwmon_sysfs);
static void devm_thermal_hwmon_release(struct device *dev, void *res)
{
thermal_remove_hwmon_sysfs(*(struct thermal_zone_device **)res);
}
int devm_thermal_add_hwmon_sysfs(struct device *dev, struct thermal_zone_device *tz)
{
struct thermal_zone_device **ptr;
int ret;
ptr = devres_alloc(devm_thermal_hwmon_release, sizeof(*ptr),
GFP_KERNEL);
if (!ptr) {
dev_warn(dev, "Failed to allocate device resource data\n");
return -ENOMEM;
}
ret = thermal_add_hwmon_sysfs(tz);
if (ret) {
dev_warn(dev, "Failed to add hwmon sysfs attributes\n");
devres_free(ptr);
return ret;
}
*ptr = tz;
devres_add(dev, ptr);
return ret;
}
EXPORT_SYMBOL_GPL(devm_thermal_add_hwmon_sysfs);
MODULE_IMPORT_NS("HWMON_THERMAL");
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