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platform/x86: think-lmi: Add WMI interface support on Lenovo platforms

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For Lenovo platforms that support a WMI interface to the BIOS add
support, using the firmware-attributes class, to allow users to access
and modify various BIOS related settings.

Signed-off-by: Mark Pearson <markpearson@lenovo.com>
Link: https://lore.kernel.org/r/20210530223111.25929-3-markpearson@lenovo.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Mark Pearson
2021-05-30 18:31:11 -04:00
committed by Hans de Goede
parent 8a1c379c5a
commit a40cd7ef22
6 changed files with 1008 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
Documentation/ABI/testing/sysfs-class-firmware-attributes
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@@ -197,8 +197,24 @@ Description:
Drivers may emit a CHANGE uevent when a password is set or unset
userspace may check it again.
On Dell systems, if Admin password is set, then all BIOS attributes
On Dell and Lenovo systems, if Admin password is set, then all BIOS attributes
require password validation.
On Lenovo systems if you change the Admin password the new password is not active until
the next boot.
Lenovo specific class extensions
------------------------------
On Lenovo systems the following additional settings are available:
lenovo_encoding:
The encoding method that is used. This can be either "ascii"
or "scancode". Default is set to "ascii"
lenovo_kbdlang:
The keyboard language method that is used. This is generally a
two char code (e.g. "us", "fr", "gr") and may vary per platform.
Default is set to "us"
What: /sys/class/firmware-attributes/*/attributes/pending_reboot
Date: February 2021

7
MAINTAINERS
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@@ -18163,6 +18163,13 @@ W: http://thinkwiki.org/wiki/Ibm-acpi
T: git git://repo.or.cz/linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git
F: drivers/platform/x86/thinkpad_acpi.c
THINKPAD LMI DRIVER
M: Mark Pearson <markpearson@lenovo.com>
L: platform-driver-x86@vger.kernel.org
S: Maintained
F: Documentation/ABI/testing/sysfs-class-firmware-attributes
F: drivers/platform/x86/think-lmi.?
THUNDERBOLT DMA TRAFFIC TEST DRIVER
M: Isaac Hazan <isaac.hazan@intel.com>
L: linux-usb@vger.kernel.org

11
drivers/platform/x86/Kconfig
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@@ -640,6 +640,17 @@ config THINKPAD_ACPI_HOTKEY_POLL
If you are not sure, say Y here. The driver enables polling only if
it is strictly necessary to do so.
config THINKPAD_LMI
tristate "Lenovo WMI-based systems management driver"
depends on ACPI_WMI
select FW_ATTR_CLASS
help
This driver allows changing BIOS settings on Lenovo machines whose
BIOS support the WMI interface.
To compile this driver as a module, choose M here: the module will
be called think-lmi.
config INTEL_ATOMISP2_LED
tristate "Intel AtomISP2 camera LED driver"
depends on GPIOLIB && LEDS_GPIO

1
drivers/platform/x86/Makefile
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@@ -63,6 +63,7 @@ obj-$(CONFIG_IBM_RTL) += ibm_rtl.o
obj-$(CONFIG_IDEAPAD_LAPTOP) += ideapad-laptop.o
obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
obj-$(CONFIG_THINKPAD_LMI) += think-lmi.o
# Intel
obj-$(CONFIG_INTEL_ATOMISP2_LED) += intel_atomisp2_led.o

891
drivers/platform/x86/think-lmi.c Normal file
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File diff suppressed because it is too large Load Diff

81
drivers/platform/x86/think-lmi.h Normal file
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@@ -0,0 +1,81 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _THINK_LMI_H_
#define _THINK_LMI_H_
#include <linux/types.h>
#define TLMI_SETTINGS_COUNT 256
#define TLMI_SETTINGS_MAXLEN 512
#define TLMI_PWD_BUFSIZE 129
#define TLMI_PWDTYPE_MAXLEN 64
#define TLMI_ENC_MAXLEN 64
#define TLMI_LANG_MAXLEN 4
#define TLMI_PWDTYPE_LEN 4
/*
* Longest string should be in the set command: allow size of BIOS
* option and choice
*/
#define TLMI_GETSET_MAXLEN (TLMI_SETTINGS_MAXLEN + TLMI_SETTINGS_MAXLEN)
/* Possible error values */
struct tlmi_err_codes {
const char *err_str;
int err_code;
};
enum encoding_option {
TLMI_ENCODING_ASCII,
TLMI_ENCODING_SCANCODE,
};
/* password configuration details */
struct tlmi_pwdcfg {
uint32_t password_mode;
uint32_t password_state;
uint32_t min_length;
uint32_t max_length;
uint32_t supported_encodings;
uint32_t supported_keyboard;
};
/* password setting details */
struct tlmi_pwd_setting {
struct kobject kobj;
bool valid;
char display_name[TLMI_PWDTYPE_MAXLEN];
char password[TLMI_PWD_BUFSIZE];
const char *pwd_type;
const char *role;
int minlen;
int maxlen;
enum encoding_option encoding;
char kbdlang[TLMI_LANG_MAXLEN];
};
/* Attribute setting details */
struct tlmi_attr_setting {
struct kobject kobj;
int index;
char display_name[TLMI_SETTINGS_MAXLEN];
char *possible_values;
};
struct think_lmi {
struct wmi_device *wmi_device;
int settings_count;
bool can_set_bios_settings;
bool can_get_bios_selections;
bool can_set_bios_password;
bool can_get_password_settings;
struct tlmi_attr_setting *setting[TLMI_SETTINGS_COUNT];
struct device *class_dev;
struct kset *attribute_kset;
struct kset *authentication_kset;
struct tlmi_pwd_setting *pwd_admin;
struct tlmi_pwd_setting *pwd_power;
};
#endif /* !_THINK_LMI_H_ */