drivers/platform/x86/dell-smbios.h

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