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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MXM WMI driver
*
* Copyright(C) 2010 Red Hat.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mxm-wmi.h>
#include <linux/acpi.h>
MODULE_AUTHOR("Dave Airlie");
MODULE_DESCRIPTION("MXM WMI Driver");
MODULE_LICENSE("GPL");
#define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
#define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
#define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
struct mxds_args {
u32 func;
u32 args;
u32 xarg;
};
int mxm_wmi_call_mxds(int adapter)
{
struct mxds_args args = {
.func = MXM_WMMX_FUNC_MXDS,
.args = 0,
.xarg = 1,
};
struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
printk("calling mux switch %d\n", adapter);
status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
&output);
if (ACPI_FAILURE(status))
return status;
printk("mux switched %d\n", status);
return 0;
}
EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
int mxm_wmi_call_mxmx(int adapter)
{
struct mxds_args args = {
.func = MXM_WMMX_FUNC_MXMX,
.args = 0,
.xarg = 1,
};
struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
printk("calling mux switch %d\n", adapter);
status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
&output);
if (ACPI_FAILURE(status))
return status;
printk("mux mutex set switched %d\n", status);
return 0;
}
EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
bool mxm_wmi_supported(void)
{
bool guid_valid;
guid_valid = wmi_has_guid(MXM_WMMX_GUID);
return guid_valid;
}
EXPORT_SYMBOL_GPL(mxm_wmi_supported);
static int __init mxm_wmi_init(void)
{
return 0;
}
static void __exit mxm_wmi_exit(void)
{
}
module_init(mxm_wmi_init);
module_exit(mxm_wmi_exit);
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