1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 *  Common functions for kernel modules using Dell SMBIOS
  4 *
  5 *  Copyright (c) Red Hat <mjg@redhat.com>
  6 *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
  7 *  Copyright (c) 2014 Pali Rohár <pali@kernel.org>
  8 *
  9 *  Based on documentation in the libsmbios package:
 10 *  Copyright (C) 2005-2014 Dell Inc.
 11 */
 12
 13#ifndef _DELL_SMBIOS_H_
 14#define _DELL_SMBIOS_H_
 15
 16#include <linux/device.h>
 17#include <uapi/linux/wmi.h>
 18
 19/* Classes and selects used only in kernel drivers */
 20#define CLASS_KBD_BACKLIGHT 4
 21#define SELECT_KBD_BACKLIGHT 11
 22
 23/* Tokens used in kernel drivers, any of these
 24 * should be filtered from userspace access
 25 */
 26#define BRIGHTNESS_TOKEN	0x007d
 27#define KBD_LED_AC_TOKEN	0x0451
 28#define KBD_LED_OFF_TOKEN	0x01E1
 29#define KBD_LED_ON_TOKEN	0x01E2
 30#define KBD_LED_AUTO_TOKEN	0x01E3
 31#define KBD_LED_AUTO_25_TOKEN	0x02EA
 32#define KBD_LED_AUTO_50_TOKEN	0x02EB
 33#define KBD_LED_AUTO_75_TOKEN	0x02EC
 34#define KBD_LED_AUTO_100_TOKEN	0x02F6
 35#define GLOBAL_MIC_MUTE_ENABLE	0x0364
 36#define GLOBAL_MIC_MUTE_DISABLE	0x0365
 37#define GLOBAL_MUTE_ENABLE	0x058C
 38#define GLOBAL_MUTE_DISABLE	0x058D
 39
 40struct notifier_block;
 41
 42struct calling_interface_token {
 43	u16 tokenID;
 44	u16 location;
 45	union {
 46		u16 value;
 47		u16 stringlength;
 48	};
 49};
 50
 51struct calling_interface_structure {
 52	struct dmi_header header;
 53	u16 cmdIOAddress;
 54	u8 cmdIOCode;
 55	u32 supportedCmds;
 56	struct calling_interface_token tokens[];
 57} __packed;
 58
 59int dell_smbios_register_device(struct device *d, void *call_fn);
 60void dell_smbios_unregister_device(struct device *d);
 61
 62int dell_smbios_error(int value);
 63int dell_smbios_call_filter(struct device *d,
 64	struct calling_interface_buffer *buffer);
 65int dell_smbios_call(struct calling_interface_buffer *buffer);
 66
 67struct calling_interface_token *dell_smbios_find_token(int tokenid);
 68
 69enum dell_laptop_notifier_actions {
 70	DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED,
 71};
 72
 73int dell_laptop_register_notifier(struct notifier_block *nb);
 74int dell_laptop_unregister_notifier(struct notifier_block *nb);
 75void dell_laptop_call_notifier(unsigned long action, void *data);
 76
 77/* for the supported backends */
 78#ifdef CONFIG_DELL_SMBIOS_WMI
 79int init_dell_smbios_wmi(void);
 80void exit_dell_smbios_wmi(void);
 81#else /* CONFIG_DELL_SMBIOS_WMI */
 82static inline int init_dell_smbios_wmi(void)
 83{
 84	return -ENODEV;
 85}
 86static inline void exit_dell_smbios_wmi(void)
 87{}
 88#endif /* CONFIG_DELL_SMBIOS_WMI */
 89
 90#ifdef CONFIG_DELL_SMBIOS_SMM
 91int init_dell_smbios_smm(void);
 92void exit_dell_smbios_smm(void);
 93#else /* CONFIG_DELL_SMBIOS_SMM */
 94static inline int init_dell_smbios_smm(void)
 95{
 96	return -ENODEV;
 97}
 98static inline void exit_dell_smbios_smm(void)
 99{}
100#endif /* CONFIG_DELL_SMBIOS_SMM */
101
102#endif /* _DELL_SMBIOS_H_ */