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/*
 *  User API methods for ACPI-WMI mapping driver
 *
 *  Copyright (C) 2017 Dell, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */
#ifndef _LINUX_WMI_H
#define _LINUX_WMI_H

#include <linux/ioctl.h>
#include <linux/types.h>

/* WMI bus will filter all WMI vendor driver requests through this IOC */
#define WMI_IOC 'W'

/* All ioctl requests through WMI should declare their size followed by
 * relevant data objects
 */
struct wmi_ioctl_buffer {
	__u64	length;
	__u8	data[];
};

/* This structure may be modified by the firmware when we enter
 * system management mode through SMM, hence the volatiles
 */
struct calling_interface_buffer {
	__u16 cmd_class;
	__u16 cmd_select;
	__volatile__ __u32 input[4];
	__volatile__ __u32 output[4];
} __attribute__((packed));

struct dell_wmi_extensions {
	__u32 argattrib;
	__u32 blength;
	__u8 data[];
} __attribute__((packed));

struct dell_wmi_smbios_buffer {
	__u64 length;
	struct calling_interface_buffer std;
	struct dell_wmi_extensions	ext;
} __attribute__((packed));

/* Whitelisted smbios class/select commands */
#define CLASS_TOKEN_READ	0
#define CLASS_TOKEN_WRITE	1
#define SELECT_TOKEN_STD	0
#define SELECT_TOKEN_BAT	1
#define SELECT_TOKEN_AC		2
#define CLASS_FLASH_INTERFACE	7
#define SELECT_FLASH_INTERFACE	3
#define CLASS_ADMIN_PROP	10
#define SELECT_ADMIN_PROP	3
#define CLASS_INFO		17
#define SELECT_RFKILL		11
#define SELECT_APP_REGISTRATION	3
#define SELECT_DOCK		22

/* whitelisted tokens */
#define CAPSULE_EN_TOKEN	0x0461
#define CAPSULE_DIS_TOKEN	0x0462
#define WSMT_EN_TOKEN		0x04EC
#define WSMT_DIS_TOKEN		0x04ED

/* Dell SMBIOS calling IOCTL command used by dell-smbios-wmi */
#define DELL_WMI_SMBIOS_CMD	_IOWR(WMI_IOC, 0, struct dell_wmi_smbios_buffer)

#endif

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✏️ wmi.h