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// SPDX-License-Identifier: GPL-2.0-only
/*
* INT3400 thermal driver
*
* Copyright (C) 2014, Intel Corporation
* Authors: Zhang Rui <rui.zhang@intel.com>
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/thermal.h>
#include "acpi_thermal_rel.h"
#define INT3400_THERMAL_TABLE_CHANGED 0x83
enum int3400_thermal_uuid {
INT3400_THERMAL_PASSIVE_1,
INT3400_THERMAL_ACTIVE,
INT3400_THERMAL_CRITICAL,
INT3400_THERMAL_ADAPTIVE_PERFORMANCE,
INT3400_THERMAL_EMERGENCY_CALL_MODE,
INT3400_THERMAL_PASSIVE_2,
INT3400_THERMAL_POWER_BOSS,
INT3400_THERMAL_VIRTUAL_SENSOR,
INT3400_THERMAL_COOLING_MODE,
INT3400_THERMAL_HARDWARE_DUTY_CYCLING,
INT3400_THERMAL_MAXIMUM_UUID,
};
static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
"42A441D6-AE6A-462b-A84B-4A8CE79027D3",
"3A95C389-E4B8-4629-A526-C52C88626BAE",
"97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
"63BE270F-1C11-48FD-A6F7-3AF253FF3E2D",
"5349962F-71E6-431D-9AE8-0A635B710AEE",
"9E04115A-AE87-4D1C-9500-0F3E340BFE75",
"F5A35014-C209-46A4-993A-EB56DE7530A1",
"6ED722A7-9240-48A5-B479-31EEF723D7CF",
"16CAF1B7-DD38-40ED-B1C1-1B8A1913D531",
"BE84BABF-C4D4-403D-B495-3128FD44dAC1",
};
struct int3400_thermal_priv {
struct acpi_device *adev;
struct thermal_zone_device *thermal;
int mode;
int art_count;
struct art *arts;
int trt_count;
struct trt *trts;
u8 uuid_bitmap;
int rel_misc_dev_res;
int current_uuid_index;
};
static ssize_t available_uuids_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
int i;
int length = 0;
for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
if (priv->uuid_bitmap & (1 << i))
if (PAGE_SIZE - length > 0)
length += snprintf(&buf[length],
PAGE_SIZE - length,
"%s\n",
int3400_thermal_uuids[i]);
}
return length;
}
static ssize_t current_uuid_show(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
return sprintf(buf, "%s\n",
int3400_thermal_uuids[priv->current_uuid_index]);
else
return sprintf(buf, "INVALID\n");
}
static ssize_t current_uuid_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
int i;
for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
if ((priv->uuid_bitmap & (1 << i)) &&
!(strncmp(buf, int3400_thermal_uuids[i],
sizeof(int3400_thermal_uuids[i]) - 1))) {
priv->current_uuid_index = i;
return count;
}
}
return -EINVAL;
}
static DEVICE_ATTR_RW(current_uuid);
static DEVICE_ATTR_RO(available_uuids);
static struct attribute *uuid_attrs[] = {
&dev_attr_available_uuids.attr,
&dev_attr_current_uuid.attr,
NULL
};
static const struct attribute_group uuid_attribute_group = {
.attrs = uuid_attrs,
.name = "uuids"
};
static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
{
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *obja, *objb;
int i, j;
int result = 0;
acpi_status status;
status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
if (ACPI_FAILURE(status))
return -ENODEV;
obja = (union acpi_object *)buf.pointer;
if (obja->type != ACPI_TYPE_PACKAGE) {
result = -EINVAL;
goto end;
}
for (i = 0; i < obja->package.count; i++) {
objb = &obja->package.elements[i];
if (objb->type != ACPI_TYPE_BUFFER) {
result = -EINVAL;
goto end;
}
/* UUID must be 16 bytes */
if (objb->buffer.length != 16) {
result = -EINVAL;
goto end;
}
for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
guid_t guid;
guid_parse(int3400_thermal_uuids[j], &guid);
if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
priv->uuid_bitmap |= (1 << j);
break;
}
}
}
end:
kfree(buf.pointer);
return result;
}
static int int3400_thermal_run_osc(acpi_handle handle,
enum int3400_thermal_uuid uuid, bool enable)
{
u32 ret, buf[2];
acpi_status status;
int result = 0;
struct acpi_osc_context context = {
.uuid_str = int3400_thermal_uuids[uuid],
.rev = 1,
.cap.length = 8,
};
buf[OSC_QUERY_DWORD] = 0;
buf[OSC_SUPPORT_DWORD] = enable;
context.cap.pointer = buf;
status = acpi_run_osc(handle, &context);
if (ACPI_SUCCESS(status)) {
ret = *((u32 *)(context.ret.pointer + 4));
if (ret != enable)
result = -EPERM;
} else
result = -EPERM;
kfree(context.ret.pointer);
return result;
}
static void int3400_notify(acpi_handle handle,
u32 event,
void *data)
{
struct int3400_thermal_priv *priv = data;
char *thermal_prop[5];
if (!priv)
return;
switch (event) {
case INT3400_THERMAL_TABLE_CHANGED:
thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
priv->thermal->type);
thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
priv->thermal->temperature);
thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
THERMAL_TABLE_CHANGED);
thermal_prop[4] = NULL;
kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
thermal_prop);
break;
default:
/* Ignore unknown notification codes sent to INT3400 device */
break;
}
}
static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
int *temp)
{
*temp = 20 * 1000; /* faked temp sensor with 20C */
return 0;
}
static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode *mode)
{
struct int3400_thermal_priv *priv = thermal->devdata;
if (!priv)
return -EINVAL;
*mode = priv->mode;
return 0;
}
static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode mode)
{
struct int3400_thermal_priv *priv = thermal->devdata;
bool enable;
int result = 0;
if (!priv)
return -EINVAL;
if (mode == THERMAL_DEVICE_ENABLED)
enable = true;
else if (mode == THERMAL_DEVICE_DISABLED)
enable = false;
else
return -EINVAL;
if (enable != priv->mode) {
priv->mode = enable;
result = int3400_thermal_run_osc(priv->adev->handle,
priv->current_uuid_index,
enable);
}
return result;
}
static struct thermal_zone_device_ops int3400_thermal_ops = {
.get_temp = int3400_thermal_get_temp,
};
static struct thermal_zone_params int3400_thermal_params = {
.governor_name = "user_space",
.no_hwmon = true,
};
static int int3400_thermal_probe(struct platform_device *pdev)
{
struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
struct int3400_thermal_priv *priv;
int result;
if (!adev)
return -ENODEV;
priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->adev = adev;
result = int3400_thermal_get_uuids(priv);
if (result)
goto free_priv;
result = acpi_parse_art(priv->adev->handle, &priv->art_count,
&priv->arts, true);
if (result)
dev_dbg(&pdev->dev, "_ART table parsing error\n");
result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
&priv->trts, true);
if (result)
dev_dbg(&pdev->dev, "_TRT table parsing error\n");
platform_set_drvdata(pdev, priv);
int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
priv, &int3400_thermal_ops,
&int3400_thermal_params, 0, 0);
if (IS_ERR(priv->thermal)) {
result = PTR_ERR(priv->thermal);
goto free_art_trt;
}
priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
priv->adev->handle);
result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
if (result)
goto free_rel_misc;
result = acpi_install_notify_handler(
priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
(void *)priv);
if (result)
goto free_sysfs;
return 0;
free_sysfs:
sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
free_rel_misc:
if (!priv->rel_misc_dev_res)
acpi_thermal_rel_misc_device_remove(priv->adev->handle);
thermal_zone_device_unregister(priv->thermal);
free_art_trt:
kfree(priv->trts);
kfree(priv->arts);
free_priv:
kfree(priv);
return result;
}
static int int3400_thermal_remove(struct platform_device *pdev)
{
struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
acpi_remove_notify_handler(
priv->adev->handle, ACPI_DEVICE_NOTIFY,
int3400_notify);
if (!priv->rel_misc_dev_res)
acpi_thermal_rel_misc_device_remove(priv->adev->handle);
sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
thermal_zone_device_unregister(priv->thermal);
kfree(priv->trts);
kfree(priv->arts);
kfree(priv);
return 0;
}
static const struct acpi_device_id int3400_thermal_match[] = {
{"INT3400", 0},
{}
};
MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
static struct platform_driver int3400_thermal_driver = {
.probe = int3400_thermal_probe,
.remove = int3400_thermal_remove,
.driver = {
.name = "int3400 thermal",
.acpi_match_table = ACPI_PTR(int3400_thermal_match),
},
};
module_platform_driver(int3400_thermal_driver);
MODULE_DESCRIPTION("INT3400 Thermal driver");
MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
MODULE_LICENSE("GPL");
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