linux/drivers/thermal/thermal_hwmon.c
Rafael J. Wysocki 698a1eb1f7 thermal: core: Store zone ops in struct thermal_zone_device
The current code requires thermal zone creators to pass pointers to
writable ops structures to thermal_zone_device_register_with_trips()
which needs to modify the target struct thermal_zone_device_ops object
if the "critical" operation in it is NULL.

Moreover, the callers of thermal_zone_device_register_with_trips() are
required to hold on to the struct thermal_zone_device_ops object passed
to it until the given thermal zone is unregistered.

Both of these requirements are quite inconvenient, so modify struct
thermal_zone_device to contain struct thermal_zone_device_ops as field and
make thermal_zone_device_register_with_trips() copy the contents of the
struct thermal_zone_device_ops passed to it via a pointer (which can be
const now) to that field.

Also adjust the code using thermal zone ops accordingly and modify
thermal_of_zone_register() to use a local ops variable during
thermal zone registration so ops do not need to be freed in
thermal_of_zone_unregister() any more.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
2024-02-23 18:24:48 +01:00

291 lines
7.2 KiB
C

// 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"
/* hwmon sys I/F */
/* thermal zone devices with the same type share one hwmon device */
struct thermal_hwmon_device {
char type[THERMAL_NAME_LENGTH];
struct device *device;
int count;
struct list_head tz_list;
struct list_head node;
};
struct thermal_hwmon_attr {
struct device_attribute attr;
char name[16];
};
/* one temperature input for each thermal zone */
struct thermal_hwmon_temp {
struct list_head hwmon_node;
struct thermal_zone_device *tz;
struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
};
static LIST_HEAD(thermal_hwmon_list);
static DEFINE_MUTEX(thermal_hwmon_list_lock);
static ssize_t
temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
{
int temperature;
int ret;
struct thermal_hwmon_attr *hwmon_attr
= container_of(attr, struct thermal_hwmon_attr, attr);
struct thermal_hwmon_temp *temp
= container_of(hwmon_attr, struct thermal_hwmon_temp,
temp_input);
struct thermal_zone_device *tz = temp->tz;
ret = thermal_zone_get_temp(tz, &temperature);
if (ret)
return ret;
return sprintf(buf, "%d\n", temperature);
}
static ssize_t
temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_hwmon_attr *hwmon_attr
= container_of(attr, struct thermal_hwmon_attr, attr);
struct thermal_hwmon_temp *temp
= container_of(hwmon_attr, struct thermal_hwmon_temp,
temp_crit);
struct thermal_zone_device *tz = temp->tz;
int temperature;
int ret;
mutex_lock(&tz->lock);
ret = tz->ops.get_crit_temp(tz, &temperature);
mutex_unlock(&tz->lock);
if (ret)
return ret;
return sprintf(buf, "%d\n", temperature);
}
static struct thermal_hwmon_device *
thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
char type[THERMAL_NAME_LENGTH];
mutex_lock(&thermal_hwmon_list_lock);
list_for_each_entry(hwmon, &thermal_hwmon_list, node) {
strcpy(type, tz->type);
strreplace(type, '-', '_');
if (!strcmp(hwmon->type, type)) {
mutex_unlock(&thermal_hwmon_list_lock);
return hwmon;
}
}
mutex_unlock(&thermal_hwmon_list_lock);
return NULL;
}
/* Find the temperature input matching a given thermal zone */
static struct thermal_hwmon_temp *
thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
const struct thermal_zone_device *tz)
{
struct thermal_hwmon_temp *temp;
mutex_lock(&thermal_hwmon_list_lock);
list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
if (temp->tz == tz) {
mutex_unlock(&thermal_hwmon_list_lock);
return temp;
}
mutex_unlock(&thermal_hwmon_list_lock);
return NULL;
}
static bool thermal_zone_crit_temp_valid(struct thermal_zone_device *tz)
{
int temp;
return tz->ops.get_crit_temp && !tz->ops.get_crit_temp(tz, &temp);
}
int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
struct thermal_hwmon_temp *temp;
int new_hwmon_device = 1;
int result;
hwmon = thermal_hwmon_lookup_by_type(tz);
if (hwmon) {
new_hwmon_device = 0;
goto register_sys_interface;
}
hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
INIT_LIST_HEAD(&hwmon->tz_list);
strscpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
strreplace(hwmon->type, '-', '_');
hwmon->device = hwmon_device_register_for_thermal(&tz->device,
hwmon->type, hwmon);
if (IS_ERR(hwmon->device)) {
result = PTR_ERR(hwmon->device);
goto free_mem;
}
register_sys_interface:
temp = kzalloc(sizeof(*temp), GFP_KERNEL);
if (!temp) {
result = -ENOMEM;
goto unregister_name;
}
temp->tz = tz;
hwmon->count++;
snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
"temp%d_input", hwmon->count);
temp->temp_input.attr.attr.name = temp->temp_input.name;
temp->temp_input.attr.attr.mode = 0444;
temp->temp_input.attr.show = temp_input_show;
sysfs_attr_init(&temp->temp_input.attr.attr);
result = device_create_file(hwmon->device, &temp->temp_input.attr);
if (result)
goto free_temp_mem;
if (thermal_zone_crit_temp_valid(tz)) {
snprintf(temp->temp_crit.name,
sizeof(temp->temp_crit.name),
"temp%d_crit", hwmon->count);
temp->temp_crit.attr.attr.name = temp->temp_crit.name;
temp->temp_crit.attr.attr.mode = 0444;
temp->temp_crit.attr.show = temp_crit_show;
sysfs_attr_init(&temp->temp_crit.attr.attr);
result = device_create_file(hwmon->device,
&temp->temp_crit.attr);
if (result)
goto unregister_input;
}
mutex_lock(&thermal_hwmon_list_lock);
if (new_hwmon_device)
list_add_tail(&hwmon->node, &thermal_hwmon_list);
list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
mutex_unlock(&thermal_hwmon_list_lock);
return 0;
unregister_input:
device_remove_file(hwmon->device, &temp->temp_input.attr);
free_temp_mem:
kfree(temp);
unregister_name:
if (new_hwmon_device)
hwmon_device_unregister(hwmon->device);
free_mem:
kfree(hwmon);
return result;
}
EXPORT_SYMBOL_GPL(thermal_add_hwmon_sysfs);
void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
struct thermal_hwmon_temp *temp;
hwmon = thermal_hwmon_lookup_by_type(tz);
if (unlikely(!hwmon)) {
/* Should never happen... */
dev_dbg(&tz->device, "hwmon device lookup failed!\n");
return;
}
temp = thermal_hwmon_lookup_temp(hwmon, tz);
if (unlikely(!temp)) {
/* Should never happen... */
dev_dbg(&tz->device, "temperature input lookup failed!\n");
return;
}
device_remove_file(hwmon->device, &temp->temp_input.attr);
if (thermal_zone_crit_temp_valid(tz))
device_remove_file(hwmon->device, &temp->temp_crit.attr);
mutex_lock(&thermal_hwmon_list_lock);
list_del(&temp->hwmon_node);
kfree(temp);
if (!list_empty(&hwmon->tz_list)) {
mutex_unlock(&thermal_hwmon_list_lock);
return;
}
list_del(&hwmon->node);
mutex_unlock(&thermal_hwmon_list_lock);
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);