1 /*
2  *  Common functions for kernel modules using Dell SMBIOS
3  *
4  *  Copyright (c) Red Hat <mjg@redhat.com>
5  *  Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
6  *  Copyright (c) 2014 Pali Rohár <pali.rohar@gmail.com>
7  *
8  *  Based on documentation in the libsmbios package:
9  *  Copyright (C) 2005-2014 Dell Inc.
10  *
11  *  This program is free software; you can redistribute it and/or modify
12  *  it under the terms of the GNU General Public License version 2 as
13  *  published by the Free Software Foundation.
14  */
15 
16 #ifndef _DELL_SMBIOS_H_
17 #define _DELL_SMBIOS_H_
18 
19 #include <linux/device.h>
20 #include <uapi/linux/wmi.h>
21 
22 /* Classes and selects used only in kernel drivers */
23 #define CLASS_KBD_BACKLIGHT 4
24 #define SELECT_KBD_BACKLIGHT 11
25 
26 /* Tokens used in kernel drivers, any of these
27  * should be filtered from userspace access
28  */
29 #define BRIGHTNESS_TOKEN	0x007d
30 #define KBD_LED_AC_TOKEN	0x0451
31 #define KBD_LED_OFF_TOKEN	0x01E1
32 #define KBD_LED_ON_TOKEN	0x01E2
33 #define KBD_LED_AUTO_TOKEN	0x01E3
34 #define KBD_LED_AUTO_25_TOKEN	0x02EA
35 #define KBD_LED_AUTO_50_TOKEN	0x02EB
36 #define KBD_LED_AUTO_75_TOKEN	0x02EC
37 #define KBD_LED_AUTO_100_TOKEN	0x02F6
38 #define GLOBAL_MIC_MUTE_ENABLE	0x0364
39 #define GLOBAL_MIC_MUTE_DISABLE	0x0365
40 
41 struct notifier_block;
42 
43 struct calling_interface_token {
44 	u16 tokenID;
45 	u16 location;
46 	union {
47 		u16 value;
48 		u16 stringlength;
49 	};
50 };
51 
52 struct calling_interface_structure {
53 	struct dmi_header header;
54 	u16 cmdIOAddress;
55 	u8 cmdIOCode;
56 	u32 supportedCmds;
57 	struct calling_interface_token tokens[];
58 } __packed;
59 
60 int dell_smbios_register_device(struct device *d, void *call_fn);
61 void dell_smbios_unregister_device(struct device *d);
62 
63 int dell_smbios_error(int value);
64 int dell_smbios_call_filter(struct device *d,
65 	struct calling_interface_buffer *buffer);
66 int dell_smbios_call(struct calling_interface_buffer *buffer);
67 
68 struct calling_interface_token *dell_smbios_find_token(int tokenid);
69 
70 enum dell_laptop_notifier_actions {
71 	DELL_LAPTOP_KBD_BACKLIGHT_BRIGHTNESS_CHANGED,
72 };
73 
74 int dell_laptop_register_notifier(struct notifier_block *nb);
75 int dell_laptop_unregister_notifier(struct notifier_block *nb);
76 void dell_laptop_call_notifier(unsigned long action, void *data);
77 
78 /* for the supported backends */
79 #ifdef CONFIG_DELL_SMBIOS_WMI
80 int init_dell_smbios_wmi(void);
81 void exit_dell_smbios_wmi(void);
82 #else /* CONFIG_DELL_SMBIOS_WMI */
init_dell_smbios_wmi(void)83 static inline int init_dell_smbios_wmi(void)
84 {
85 	return -ENODEV;
86 }
exit_dell_smbios_wmi(void)87 static inline void exit_dell_smbios_wmi(void)
88 {}
89 #endif /* CONFIG_DELL_SMBIOS_WMI */
90 
91 #ifdef CONFIG_DELL_SMBIOS_SMM
92 int init_dell_smbios_smm(void);
93 void exit_dell_smbios_smm(void);
94 #else /* CONFIG_DELL_SMBIOS_SMM */
init_dell_smbios_smm(void)95 static inline int init_dell_smbios_smm(void)
96 {
97 	return -ENODEV;
98 }
exit_dell_smbios_smm(void)99 static inline void exit_dell_smbios_smm(void)
100 {}
101 #endif /* CONFIG_DELL_SMBIOS_SMM */
102 
103 #endif /* _DELL_SMBIOS_H_ */
104