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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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000703f44c
The MXMX method appears to be a mutex of some sort. Signed-off-by: Dave Airlie <airlied@redhat.com>
112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
/*
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* MXM WMI driver
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*
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* Copyright(C) 2010 Red Hat.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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MODULE_AUTHOR("Dave Airlie");
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MODULE_DESCRIPTION("MXM WMI Driver");
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MODULE_LICENSE("GPL");
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#define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
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MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
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#define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
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#define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
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struct mxds_args {
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u32 func;
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u32 args;
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u32 xarg;
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};
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int mxm_wmi_call_mxds(int adapter)
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{
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struct mxds_args args = {
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.func = MXM_WMMX_FUNC_MXDS,
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.args = 0,
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.xarg = 1,
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};
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struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_status status;
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printk("calling mux switch %d\n", adapter);
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status = wmi_evaluate_method(MXM_WMMX_GUID, 0x1, adapter, &input,
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&output);
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if (ACPI_FAILURE(status))
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return status;
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printk("mux switched %d\n", status);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
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int mxm_wmi_call_mxmx(int adapter)
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{
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struct mxds_args args = {
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.func = MXM_WMMX_FUNC_MXMX,
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.args = 0,
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.xarg = 1,
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};
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struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_status status;
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printk("calling mux switch %d\n", adapter);
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status = wmi_evaluate_method(MXM_WMMX_GUID, 0x1, adapter, &input,
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&output);
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if (ACPI_FAILURE(status))
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return status;
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printk("mux mutex set switched %d\n", status);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
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bool mxm_wmi_supported(void)
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{
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bool guid_valid;
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guid_valid = wmi_has_guid(MXM_WMMX_GUID);
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return guid_valid;
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}
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EXPORT_SYMBOL_GPL(mxm_wmi_supported);
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static int __init mxm_wmi_init(void)
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{
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return 0;
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}
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static void __exit mxm_wmi_exit(void)
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{
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}
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module_init(mxm_wmi_init);
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module_exit(mxm_wmi_exit);
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