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.rohar@gmail.com>
  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
 38struct notifier_block;
 39
 40struct calling_interface_token {
 41	u16 tokenID;
 42	u16 location;
 43	union {
 44		u16 value;
 45		u16 stringlength;
 46	};
 47};
 48
 49struct calling_interface_structure {
 50	struct dmi_header header;
 51	u16 cmdIOAddress;
 52	u8 cmdIOCode;
 53	u32 supportedCmds;
 54	struct calling_interface_token tokens[];
 55} __packed;
 56
 57int dell_smbios_register_device(struct device *d, void *call_fn);
 58void dell_smbios_unregister_device(struct device *d);
 59
 60int dell_smbios_error(int value);
 61int dell_smbios_call_filter(struct device *d,
 62	struct calling_interface_buffer *buffer);
 63int dell_smbios_call(struct calling_interface_buffer *buffer);
 64
 65struct calling_interface_token *dell_smbios_find_token(int tokenid);
 66
 67enum dell_laptop_notifier_actions {
 68	DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED,
 69};
 70
 71int dell_laptop_register_notifier(struct notifier_block *nb);
 72int dell_laptop_unregister_notifier(struct notifier_block *nb);
 73void dell_laptop_call_notifier(unsigned long action, void *data);
 74
 75/* for the supported backends */
 76#ifdef CONFIG_DELL_SMBIOS_WMI
 77int init_dell_smbios_wmi(void);
 78void exit_dell_smbios_wmi(void);
 79#else /* CONFIG_DELL_SMBIOS_WMI */
 80static inline int init_dell_smbios_wmi(void)
 81{
 82	return -ENODEV;
 83}
 84static inline void exit_dell_smbios_wmi(void)
 85{}
 86#endif /* CONFIG_DELL_SMBIOS_WMI */
 87
 88#ifdef CONFIG_DELL_SMBIOS_SMM
 89int init_dell_smbios_smm(void);
 90void exit_dell_smbios_smm(void);
 91#else /* CONFIG_DELL_SMBIOS_SMM */
 92static inline int init_dell_smbios_smm(void)
 93{
 94	return -ENODEV;
 95}
 96static inline void exit_dell_smbios_smm(void)
 97{}
 98#endif /* CONFIG_DELL_SMBIOS_SMM */
 99
100#endif /* _DELL_SMBIOS_H_ */