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// SPDX-License-Identifier: GPL-2.0
/*
* Inspur WMI Platform Profile
*
* Copyright (C) 2018 Ai Chao <aichao@kylinos.cn>
*/
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_profile.h>
#include <linux/wmi.h>
#define WMI_INSPUR_POWERMODE_BIOS_GUID "596C31E3-332D-43C9-AEE9-585493284F5D"
enum inspur_wmi_method_ids {
INSPUR_WMI_GET_POWERMODE = 0x02,
INSPUR_WMI_SET_POWERMODE = 0x03,
};
/*
* Power Mode:
* 0x0: Balance Mode
* 0x1: Performance Mode
* 0x2: Power Saver Mode
*/
enum inspur_tmp_profile {
INSPUR_TMP_PROFILE_BALANCE = 0,
INSPUR_TMP_PROFILE_PERFORMANCE = 1,
INSPUR_TMP_PROFILE_POWERSAVE = 2,
};
struct inspur_wmi_priv {
struct wmi_device *wdev;
struct device *ppdev;
};
static int inspur_wmi_perform_query(struct wmi_device *wdev,
enum inspur_wmi_method_ids query_id,
void *buffer, size_t insize,
size_t outsize)
{
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer input = { insize, buffer};
union acpi_object *obj;
acpi_status status;
int ret = 0;
status = wmidev_evaluate_method(wdev, 0, query_id, &input, &output);
if (ACPI_FAILURE(status)) {
dev_err(&wdev->dev, "EC Powermode control failed: %s\n",
acpi_format_exception(status));
return -EIO;
}
obj = output.pointer;
if (!obj)
return -EINVAL;
if (obj->type != ACPI_TYPE_BUFFER ||
obj->buffer.length != outsize) {
ret = -EINVAL;
goto out_free;
}
memcpy(buffer, obj->buffer.pointer, obj->buffer.length);
out_free:
kfree(obj);
return ret;
}
/*
* Set Power Mode to EC RAM. If Power Mode value greater than 0x3,
* return error
* Method ID: 0x3
* Arg: 4 Bytes
* Byte [0]: Power Mode:
* 0x0: Balance Mode
* 0x1: Performance Mode
* 0x2: Power Saver Mode
* Return Value: 4 Bytes
* Byte [0]: Return Code
* 0x0: No Error
* 0x1: Error
*/
static int inspur_platform_profile_set(struct device *dev,
enum platform_profile_option profile)
{
struct inspur_wmi_priv *priv = dev_get_drvdata(dev);
u8 ret_code[4] = {0, 0, 0, 0};
int ret;
switch (profile) {
case PLATFORM_PROFILE_BALANCED:
ret_code[0] = INSPUR_TMP_PROFILE_BALANCE;
break;
case PLATFORM_PROFILE_PERFORMANCE:
ret_code[0] = INSPUR_TMP_PROFILE_PERFORMANCE;
break;
case PLATFORM_PROFILE_LOW_POWER:
ret_code[0] = INSPUR_TMP_PROFILE_POWERSAVE;
break;
default:
return -EOPNOTSUPP;
}
ret = inspur_wmi_perform_query(priv->wdev, INSPUR_WMI_SET_POWERMODE,
ret_code, sizeof(ret_code),
sizeof(ret_code));
if (ret < 0)
return ret;
if (ret_code[0])
return -EBADRQC;
return 0;
}
/*
* Get Power Mode from EC RAM, If Power Mode value greater than 0x3,
* return error
* Method ID: 0x2
* Return Value: 4 Bytes
* Byte [0]: Return Code
* 0x0: No Error
* 0x1: Error
* Byte [1]: Power Mode
* 0x0: Balance Mode
* 0x1: Performance Mode
* 0x2: Power Saver Mode
*/
static int inspur_platform_profile_get(struct device *dev,
enum platform_profile_option *profile)
{
struct inspur_wmi_priv *priv = dev_get_drvdata(dev);
u8 ret_code[4] = {0, 0, 0, 0};
int ret;
ret = inspur_wmi_perform_query(priv->wdev, INSPUR_WMI_GET_POWERMODE,
&ret_code, sizeof(ret_code),
sizeof(ret_code));
if (ret < 0)
return ret;
if (ret_code[0])
return -EBADRQC;
switch (ret_code[1]) {
case INSPUR_TMP_PROFILE_BALANCE:
*profile = PLATFORM_PROFILE_BALANCED;
break;
case INSPUR_TMP_PROFILE_PERFORMANCE:
*profile = PLATFORM_PROFILE_PERFORMANCE;
break;
case INSPUR_TMP_PROFILE_POWERSAVE:
*profile = PLATFORM_PROFILE_LOW_POWER;
break;
default:
return -EINVAL;
}
return 0;
}
static int inspur_platform_profile_probe(void *drvdata, unsigned long *choices)
{
set_bit(PLATFORM_PROFILE_LOW_POWER, choices);
set_bit(PLATFORM_PROFILE_BALANCED, choices);
set_bit(PLATFORM_PROFILE_PERFORMANCE, choices);
return 0;
}
static const struct platform_profile_ops inspur_platform_profile_ops = {
.probe = inspur_platform_profile_probe,
.profile_get = inspur_platform_profile_get,
.profile_set = inspur_platform_profile_set,
};
static int inspur_wmi_probe(struct wmi_device *wdev, const void *context)
{
struct inspur_wmi_priv *priv;
priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->wdev = wdev;
dev_set_drvdata(&wdev->dev, priv);
priv->ppdev = devm_platform_profile_register(&wdev->dev, "inspur-wmi", priv,
&inspur_platform_profile_ops);
return PTR_ERR_OR_ZERO(priv->ppdev);
}
static const struct wmi_device_id inspur_wmi_id_table[] = {
{ .guid_string = WMI_INSPUR_POWERMODE_BIOS_GUID },
{ }
};
MODULE_DEVICE_TABLE(wmi, inspur_wmi_id_table);
static struct wmi_driver inspur_wmi_driver = {
.driver = {
.name = "inspur-wmi-platform-profile",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.id_table = inspur_wmi_id_table,
.probe = inspur_wmi_probe,
.no_singleton = true,
};
module_wmi_driver(inspur_wmi_driver);
MODULE_AUTHOR("Ai Chao <aichao@kylinos.cn>");
MODULE_DESCRIPTION("Platform Profile Support for Inspur");
MODULE_LICENSE("GPL");
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