Commit a40cd7ef authored by Mark Pearson's avatar Mark Pearson Committed by Hans de Goede

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

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: default avatarMark Pearson <markpearson@lenovo.com>
Link: https://lore.kernel.org/r/20210530223111.25929-3-markpearson@lenovo.comReviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 8a1c379c
...@@ -197,8 +197,24 @@ Description: ...@@ -197,8 +197,24 @@ Description:
Drivers may emit a CHANGE uevent when a password is set or unset Drivers may emit a CHANGE uevent when a password is set or unset
userspace may check it again. 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. 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 What: /sys/class/firmware-attributes/*/attributes/pending_reboot
Date: February 2021 Date: February 2021
......
...@@ -18163,6 +18163,13 @@ W: http://thinkwiki.org/wiki/Ibm-acpi ...@@ -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 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 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 THUNDERBOLT DMA TRAFFIC TEST DRIVER
M: Isaac Hazan <isaac.hazan@intel.com> M: Isaac Hazan <isaac.hazan@intel.com>
L: linux-usb@vger.kernel.org L: linux-usb@vger.kernel.org
......
...@@ -640,6 +640,17 @@ config THINKPAD_ACPI_HOTKEY_POLL ...@@ -640,6 +640,17 @@ config THINKPAD_ACPI_HOTKEY_POLL
If you are not sure, say Y here. The driver enables polling only if If you are not sure, say Y here. The driver enables polling only if
it is strictly necessary to do so. 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 config INTEL_ATOMISP2_LED
tristate "Intel AtomISP2 camera LED driver" tristate "Intel AtomISP2 camera LED driver"
depends on GPIOLIB && LEDS_GPIO depends on GPIOLIB && LEDS_GPIO
......
...@@ -63,6 +63,7 @@ obj-$(CONFIG_IBM_RTL) += ibm_rtl.o ...@@ -63,6 +63,7 @@ obj-$(CONFIG_IBM_RTL) += ibm_rtl.o
obj-$(CONFIG_IDEAPAD_LAPTOP) += ideapad-laptop.o obj-$(CONFIG_IDEAPAD_LAPTOP) += ideapad-laptop.o
obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
obj-$(CONFIG_THINKPAD_LMI) += think-lmi.o
# Intel # Intel
obj-$(CONFIG_INTEL_ATOMISP2_LED) += intel_atomisp2_led.o obj-$(CONFIG_INTEL_ATOMISP2_LED) += intel_atomisp2_led.o
......
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Think LMI BIOS configuration driver
*
* Copyright(C) 2019-2021 Lenovo
*
* Original code from Thinkpad-wmi project https://github.com/iksaif/thinkpad-wmi
* Copyright(C) 2017 Corentin Chary <corentin.chary@gmail.com>
* Distributed under the GPL-2.0 license
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/wmi.h>
#include "firmware_attributes_class.h"
#include "think-lmi.h"
/*
* Name:
* Lenovo_BiosSetting
* Description:
* Get item name and settings for current LMI instance.
* Type:
* Query
* Returns:
* "Item,Value"
* Example:
* "WakeOnLAN,Enable"
*/
#define LENOVO_BIOS_SETTING_GUID "51F5230E-9677-46CD-A1CF-C0B23EE34DB7"
/*
* Name:
* Lenovo_SetBiosSetting
* Description:
* Change the BIOS setting to the desired value using the Lenovo_SetBiosSetting
* class. To save the settings, use the Lenovo_SaveBiosSetting class.
* BIOS settings and values are case sensitive.
* After making changes to the BIOS settings, you must reboot the computer
* before the changes will take effect.
* Type:
* Method
* Arguments:
* "Item,Value,Password,Encoding,KbdLang;"
* Example:
* "WakeOnLAN,Disable,pa55w0rd,ascii,us;"
*/
#define LENOVO_SET_BIOS_SETTINGS_GUID "98479A64-33F5-4E33-A707-8E251EBBC3A1"
/*
* Name:
* Lenovo_SaveBiosSettings
* Description:
* Save any pending changes in settings.
* Type:
* Method
* Arguments:
* "Password,Encoding,KbdLang;"
* Example:
* "pa55w0rd,ascii,us;"
*/
#define LENOVO_SAVE_BIOS_SETTINGS_GUID "6A4B54EF-A5ED-4D33-9455-B0D9B48DF4B3"
/*
* Name:
* Lenovo_BiosPasswordSettings
* Description:
* Return BIOS Password settings
* Type:
* Query
* Returns:
* PasswordMode, PasswordState, MinLength, MaxLength,
* SupportedEncoding, SupportedKeyboard
*/
#define LENOVO_BIOS_PASSWORD_SETTINGS_GUID "8ADB159E-1E32-455C-BC93-308A7ED98246"
/*
* Name:
* Lenovo_SetBiosPassword
* Description:
* Change a specific password.
* - BIOS settings cannot be changed at the same boot as power-on
* passwords (POP) and hard disk passwords (HDP). If you want to change
* BIOS settings and POP or HDP, you must reboot the system after changing
* one of them.
* - A password cannot be set using this method when one does not already
* exist. Passwords can only be updated or cleared.
* Type:
* Method
* Arguments:
* "PasswordType,CurrentPassword,NewPassword,Encoding,KbdLang;"
* Example:
* "pop,pa55w0rd,newpa55w0rd,ascii,us;”
*/
#define LENOVO_SET_BIOS_PASSWORD_GUID "2651D9FD-911C-4B69-B94E-D0DED5963BD7"
/*
* Name:
* Lenovo_GetBiosSelections
* Description:
* Return a list of valid settings for a given item.
* Type:
* Method
* Arguments:
* "Item"
* Returns:
* "Value1,Value2,Value3,..."
* Example:
* -> "FlashOverLAN"
* <- "Enabled,Disabled"
*/
#define LENOVO_GET_BIOS_SELECTIONS_GUID "7364651A-132F-4FE7-ADAA-40C6C7EE2E3B"
#define TLMI_POP_PWD (1 << 0)
#define TLMI_PAP_PWD (1 << 1)
#define to_tlmi_pwd_setting(kobj) container_of(kobj, struct tlmi_pwd_setting, kobj)
#define to_tlmi_attr_setting(kobj) container_of(kobj, struct tlmi_attr_setting, kobj)
static const struct tlmi_err_codes tlmi_errs[] = {
{"Success", 0},
{"Not Supported", -EOPNOTSUPP},
{"Invalid Parameter", -EINVAL},
{"Access Denied", -EACCES},
{"System Busy", -EBUSY},
};
static const char * const encoding_options[] = {
[TLMI_ENCODING_ASCII] = "ascii",
[TLMI_ENCODING_SCANCODE] = "scancode",
};
static struct think_lmi tlmi_priv;
struct class *fw_attr_class;
/* ------ Utility functions ------------*/
/* Convert BIOS WMI error string to suitable error code */
static int tlmi_errstr_to_err(const char *errstr)
{
int i;
for (i = 0; i < sizeof(tlmi_errs)/sizeof(struct tlmi_err_codes); i++) {
if (!strcmp(tlmi_errs[i].err_str, errstr))
return tlmi_errs[i].err_code;
}
return -EPERM;
}
/* Extract error string from WMI return buffer */
static int tlmi_extract_error(const struct acpi_buffer *output)
{
const union acpi_object *obj;
obj = output->pointer;
if (!obj)
return -ENOMEM;
if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer)
return -EIO;
return tlmi_errstr_to_err(obj->string.pointer);
}
/* Utility function to execute WMI call to BIOS */
static int tlmi_simple_call(const char *guid, const char *arg)
{
const struct acpi_buffer input = { strlen(arg), (char *)arg };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
int i, err;
/*
* Duplicated call required to match BIOS workaround for behavior
* seen when WMI accessed via scripting on other OS.
*/
for (i = 0; i < 2; i++) {
/* (re)initialize output buffer to default state */
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL;
status = wmi_evaluate_method(guid, 0, 0, &input, &output);
if (ACPI_FAILURE(status)) {
kfree(output.pointer);
return -EIO;
}
err = tlmi_extract_error(&output);
kfree(output.pointer);
if (err)
return err;
}
return 0;
}
/* Extract output string from WMI return buffer */
static int tlmi_extract_output_string(const struct acpi_buffer *output,
char **string)
{
const union acpi_object *obj;
char *s;
obj = output->pointer;
if (!obj)
return -ENOMEM;
if (obj->type != ACPI_TYPE_STRING || !obj->string.pointer)
return -EIO;
s = kstrdup(obj->string.pointer, GFP_KERNEL);
if (!s)
return -ENOMEM;
*string = s;
return 0;
}
/* ------ Core interface functions ------------*/
/* Get password settings from BIOS */
static int tlmi_get_pwd_settings(struct tlmi_pwdcfg *pwdcfg)
{
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
const union acpi_object *obj;
acpi_status status;
if (!tlmi_priv.can_get_password_settings)
return -EOPNOTSUPP;
status = wmi_query_block(LENOVO_BIOS_PASSWORD_SETTINGS_GUID, 0,
&output);
if (ACPI_FAILURE(status))
return -EIO;
obj = output.pointer;
if (!obj)
return -ENOMEM;
if (obj->type != ACPI_TYPE_BUFFER || !obj->buffer.pointer) {
kfree(obj);
return -EIO;
}
/*
* The size of thinkpad_wmi_pcfg on ThinkStation is larger than ThinkPad.
* To make the driver compatible on different brands, we permit it to get
* the data in below case.
*/
if (obj->buffer.length < sizeof(struct tlmi_pwdcfg)) {
pr_warn("Unknown pwdcfg buffer length %d\n", obj->buffer.length);
kfree(obj);
return -EIO;
}
memcpy(pwdcfg, obj->buffer.pointer, sizeof(struct tlmi_pwdcfg));
kfree(obj);
return 0;
}
static int tlmi_save_bios_settings(const char *password)
{
return tlmi_simple_call(LENOVO_SAVE_BIOS_SETTINGS_GUID,
password);
}
static int tlmi_setting(int item, char **value, const char *guid_string)
{
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
int ret;
status = wmi_query_block(guid_string, item, &output);
if (ACPI_FAILURE(status)) {
kfree(output.pointer);
return -EIO;
}
ret = tlmi_extract_output_string(&output, value);
kfree(output.pointer);
return ret;
}
static int tlmi_get_bios_selections(const char *item, char **value)
{
const struct acpi_buffer input = { strlen(item), (char *)item };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
int ret;
status = wmi_evaluate_method(LENOVO_GET_BIOS_SELECTIONS_GUID,
0, 0, &input, &output);
if (ACPI_FAILURE(status)) {
kfree(output.pointer);
return -EIO;
}
ret = tlmi_extract_output_string(&output, value);
kfree(output.pointer);
return ret;
}
/* ---- Authentication sysfs --------------------------------------------------------- */
static ssize_t is_enabled_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%d\n", setting->valid);
}
static struct kobj_attribute auth_is_pass_set = __ATTR_RO(is_enabled);
static ssize_t current_password_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
size_t pwdlen;
char *p;
pwdlen = strlen(buf);
/* pwdlen == 0 is allowed to clear the password */
if (pwdlen && ((pwdlen < setting->minlen) || (pwdlen > setting->maxlen)))
return -EINVAL;
strscpy(setting->password, buf, setting->maxlen);
/* Strip out CR if one is present, setting password won't work if it is present */
p = strchrnul(setting->password, '\n');
*p = '\0';
return count;
}
static struct kobj_attribute auth_current_password = __ATTR_WO(current_password);
static ssize_t new_password_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
char *auth_str, *new_pwd, *p;
size_t pwdlen;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!tlmi_priv.can_set_bios_password)
return -EOPNOTSUPP;
new_pwd = kstrdup(buf, GFP_KERNEL);
if (!new_pwd)
return -ENOMEM;
/* Strip out CR if one is present, setting password won't work if it is present */
p = strchrnul(new_pwd, '\n');
*p = '\0';
pwdlen = strlen(new_pwd);
/* pwdlen == 0 is allowed to clear the password */
if (pwdlen && ((pwdlen < setting->minlen) || (pwdlen > setting->maxlen))) {
ret = -EINVAL;
goto out;
}
/* Format: 'PasswordType,CurrentPw,NewPw,Encoding,KbdLang;' */
auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s,%s,%s;",
setting->pwd_type, setting->password, new_pwd,
encoding_options[setting->encoding], setting->kbdlang);
if (!auth_str) {
ret = -ENOMEM;
goto out;
}
ret = tlmi_simple_call(LENOVO_SET_BIOS_PASSWORD_GUID, auth_str);
kfree(auth_str);
out:
kfree(new_pwd);
return ret ?: count;
}
static struct kobj_attribute auth_new_password = __ATTR_WO(new_password);
static ssize_t min_password_length_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%d\n", setting->minlen);
}
static struct kobj_attribute auth_min_pass_length = __ATTR_RO(min_password_length);
static ssize_t max_password_length_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%d\n", setting->maxlen);
}
static struct kobj_attribute auth_max_pass_length = __ATTR_RO(max_password_length);
static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sysfs_emit(buf, "password\n");
}
static struct kobj_attribute auth_mechanism = __ATTR_RO(mechanism);
static ssize_t encoding_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%s\n", encoding_options[setting->encoding]);
}
static ssize_t encoding_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
int i;
/* Scan for a matching profile */
i = sysfs_match_string(encoding_options, buf);
if (i < 0)
return -EINVAL;
setting->encoding = i;
return count;
}
static struct kobj_attribute auth_encoding = __ATTR_RW(encoding);
static ssize_t kbdlang_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%s\n", setting->kbdlang);
}
static ssize_t kbdlang_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
int length;
length = strlen(buf);
if (buf[length-1] == '\n')
length--;
if (!length || (length >= TLMI_LANG_MAXLEN))
return -EINVAL;
memcpy(setting->kbdlang, buf, length);
setting->kbdlang[length] = '\0';
return count;
}
static struct kobj_attribute auth_kbdlang = __ATTR_RW(kbdlang);
static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
return sysfs_emit(buf, "%s\n", setting->role);
}
static struct kobj_attribute auth_role = __ATTR_RO(role);
static struct attribute *auth_attrs[] = {
&auth_is_pass_set.attr,
&auth_min_pass_length.attr,
&auth_max_pass_length.attr,
&auth_current_password.attr,
&auth_new_password.attr,
&auth_role.attr,
&auth_mechanism.attr,
&auth_encoding.attr,
&auth_kbdlang.attr,
NULL
};
static const struct attribute_group auth_attr_group = {
.attrs = auth_attrs,
};
/* ---- Attributes sysfs --------------------------------------------------------- */
static ssize_t display_name_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
return sysfs_emit(buf, "%s\n", setting->display_name);
}
static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
char *item;
int ret;
ret = tlmi_setting(setting->index, &item, LENOVO_BIOS_SETTING_GUID);
if (ret)
return ret;
ret = sysfs_emit(buf, "%s\n", item);
kfree(item);
return ret;
}
static ssize_t possible_values_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
if (!tlmi_priv.can_get_bios_selections)
return -EOPNOTSUPP;
return sysfs_emit(buf, "%s\n", setting->possible_values);
}
static ssize_t current_value_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
char *set_str = NULL, *new_setting = NULL;
char *auth_str = NULL;
char *p;
int ret;
if (!tlmi_priv.can_set_bios_settings)
return -EOPNOTSUPP;
new_setting = kstrdup(buf, GFP_KERNEL);
if (!new_setting)
return -ENOMEM;
/* Strip out CR if one is present */
p = strchrnul(new_setting, '\n');
*p = '\0';
if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password) {
auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
tlmi_priv.pwd_admin->password,
encoding_options[tlmi_priv.pwd_admin->encoding],
tlmi_priv.pwd_admin->kbdlang);
if (!auth_str) {
ret = -ENOMEM;
goto out;
}
}
if (auth_str)
set_str = kasprintf(GFP_KERNEL, "%s,%s,%s", setting->display_name,
new_setting, auth_str);
else
set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
new_setting);
if (!set_str) {
ret = -ENOMEM;
goto out;
}
ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTINGS_GUID, set_str);
if (ret)
goto out;
if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password)
ret = tlmi_save_bios_settings(auth_str);
else
ret = tlmi_save_bios_settings("");
out:
kfree(auth_str);
kfree(set_str);
kfree(new_setting);
return ret ?: count;
}
static struct kobj_attribute attr_displ_name = __ATTR_RO(display_name);
static struct kobj_attribute attr_possible_values = __ATTR_RO(possible_values);
static struct kobj_attribute attr_current_val = __ATTR_RW_MODE(current_value, 0600);
static struct attribute *tlmi_attrs[] = {
&attr_displ_name.attr,
&attr_current_val.attr,
&attr_possible_values.attr,
NULL
};
static const struct attribute_group tlmi_attr_group = {
.attrs = tlmi_attrs,
};
static ssize_t tlmi_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct kobj_attribute *kattr;
kattr = container_of(attr, struct kobj_attribute, attr);
if (kattr->show)
return kattr->show(kobj, kattr, buf);
return -EIO;
}
static ssize_t tlmi_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count)
{
struct kobj_attribute *kattr;
kattr = container_of(attr, struct kobj_attribute, attr);
if (kattr->store)
return kattr->store(kobj, kattr, buf, count);
return -EIO;
}
static const struct sysfs_ops tlmi_kobj_sysfs_ops = {
.show = tlmi_attr_show,
.store = tlmi_attr_store,
};
static void tlmi_attr_setting_release(struct kobject *kobj)
{
struct tlmi_attr_setting *setting = to_tlmi_attr_setting(kobj);
kfree(setting);
}
static void tlmi_pwd_setting_release(struct kobject *kobj)
{
struct tlmi_pwd_setting *setting = to_tlmi_pwd_setting(kobj);
kfree(setting);
}
static struct kobj_type tlmi_attr_setting_ktype = {
.release = &tlmi_attr_setting_release,
.sysfs_ops = &tlmi_kobj_sysfs_ops,
};
static struct kobj_type tlmi_pwd_setting_ktype = {
.release = &tlmi_pwd_setting_release,
.sysfs_ops = &tlmi_kobj_sysfs_ops,
};
/* ---- Initialisation --------------------------------------------------------- */
static void tlmi_release_attr(void)
{
int i;
/* Attribute structures */
for (i = 0; i < TLMI_SETTINGS_COUNT; i++) {
if (tlmi_priv.setting[i]) {
kfree(tlmi_priv.setting[i]->possible_values);
sysfs_remove_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group);
kobject_put(&tlmi_priv.setting[i]->kobj);
}
}
kset_unregister(tlmi_priv.attribute_kset);
/* Authentication structures */
sysfs_remove_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group);
kobject_put(&tlmi_priv.pwd_admin->kobj);
sysfs_remove_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group);
kobject_put(&tlmi_priv.pwd_power->kobj);
kset_unregister(tlmi_priv.authentication_kset);
}
static int tlmi_sysfs_init(void)
{
int i, ret;
ret = fw_attributes_class_get(&fw_attr_class);
if (ret)
return ret;
tlmi_priv.class_dev = device_create(fw_attr_class, NULL, MKDEV(0, 0),
NULL, "%s", "thinklmi");
if (IS_ERR(tlmi_priv.class_dev)) {
ret = PTR_ERR(tlmi_priv.class_dev);
goto fail_class_created;
}
tlmi_priv.attribute_kset = kset_create_and_add("attributes", NULL,
&tlmi_priv.class_dev->kobj);
if (!tlmi_priv.attribute_kset) {
ret = -ENOMEM;
goto fail_device_created;
}
for (i = 0; i < TLMI_SETTINGS_COUNT; i++) {
/* Check if index is a valid setting - skip if it isn't */
if (!tlmi_priv.setting[i])
continue;
/* Build attribute */
tlmi_priv.setting[i]->kobj.kset = tlmi_priv.attribute_kset;
ret = kobject_init_and_add(&tlmi_priv.setting[i]->kobj, &tlmi_attr_setting_ktype,
NULL, "%s", tlmi_priv.setting[i]->display_name);
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group);
if (ret)
goto fail_create_attr;
}
/* Create authentication entries */
tlmi_priv.authentication_kset = kset_create_and_add("authentication", NULL,
&tlmi_priv.class_dev->kobj);
if (!tlmi_priv.authentication_kset) {
ret = -ENOMEM;
goto fail_create_attr;
}
tlmi_priv.pwd_admin->kobj.kset = tlmi_priv.authentication_kset;
ret = kobject_init_and_add(&tlmi_priv.pwd_admin->kobj, &tlmi_pwd_setting_ktype,
NULL, "%s", "Admin");
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group);
if (ret)
goto fail_create_attr;
tlmi_priv.pwd_power->kobj.kset = tlmi_priv.authentication_kset;
ret = kobject_init_and_add(&tlmi_priv.pwd_power->kobj, &tlmi_pwd_setting_ktype,
NULL, "%s", "System");
if (ret)
goto fail_create_attr;
ret = sysfs_create_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group);
if (ret)
goto fail_create_attr;
return ret;
fail_create_attr:
tlmi_release_attr();
fail_device_created:
device_destroy(fw_attr_class, MKDEV(0, 0));
fail_class_created:
fw_attributes_class_put();
return ret;
}
/* ---- Base Driver -------------------------------------------------------- */
static int tlmi_analyze(void)
{
struct tlmi_pwdcfg pwdcfg;
acpi_status status;
int i, ret;
if (wmi_has_guid(LENOVO_SET_BIOS_SETTINGS_GUID) &&
wmi_has_guid(LENOVO_SAVE_BIOS_SETTINGS_GUID))
tlmi_priv.can_set_bios_settings = true;
if (wmi_has_guid(LENOVO_GET_BIOS_SELECTIONS_GUID))
tlmi_priv.can_get_bios_selections = true;
if (wmi_has_guid(LENOVO_SET_BIOS_PASSWORD_GUID))
tlmi_priv.can_set_bios_password = true;
if (wmi_has_guid(LENOVO_BIOS_PASSWORD_SETTINGS_GUID))
tlmi_priv.can_get_password_settings = true;
/*
* Try to find the number of valid settings of this machine
* and use it to create sysfs attributes.
*/
for (i = 0; i < TLMI_SETTINGS_COUNT; ++i) {
struct tlmi_attr_setting *setting;
char *item = NULL;
char *p;
tlmi_priv.setting[i] = NULL;
status = tlmi_setting(i, &item, LENOVO_BIOS_SETTING_GUID);
if (ACPI_FAILURE(status))
break;
if (!item)
break;
if (!*item)
continue;
/* It is not allowed to have '/' for file name. Convert it into '\'. */
strreplace(item, '/', '\\');
/* Remove the value part */
p = strchrnul(item, ',');
*p = '\0';
/* Create a setting entry */
setting = kzalloc(sizeof(*setting), GFP_KERNEL);
if (!setting) {
ret = -ENOMEM;
goto fail_clear_attr;
}
setting->index = i;
strscpy(setting->display_name, item, TLMI_SETTINGS_MAXLEN);
/* If BIOS selections supported, load those */
if (tlmi_priv.can_get_bios_selections) {
ret = tlmi_get_bios_selections(setting->display_name,
&setting->possible_values);
if (ret || !setting->possible_values)
pr_info("Error retrieving possible values for %d : %s\n",
i, setting->display_name);
}
tlmi_priv.setting[i] = setting;
tlmi_priv.settings_count++;
kfree(item);
}
/* Create password setting structure */
ret = tlmi_get_pwd_settings(&pwdcfg);
if (ret)
goto fail_clear_attr;
tlmi_priv.pwd_admin = kzalloc(sizeof(struct tlmi_pwd_setting), GFP_KERNEL);
if (!tlmi_priv.pwd_admin) {
ret = -ENOMEM;
goto fail_clear_attr;
}
strscpy(tlmi_priv.pwd_admin->display_name, "admin", TLMI_PWDTYPE_MAXLEN);
strscpy(tlmi_priv.pwd_admin->kbdlang, "us", TLMI_LANG_MAXLEN);
tlmi_priv.pwd_admin->encoding = TLMI_ENCODING_ASCII;
tlmi_priv.pwd_admin->pwd_type = "pap";
tlmi_priv.pwd_admin->role = "bios-admin";
tlmi_priv.pwd_admin->minlen = pwdcfg.min_length;
if (WARN_ON(pwdcfg.max_length >= TLMI_PWD_BUFSIZE))
pwdcfg.max_length = TLMI_PWD_BUFSIZE - 1;
tlmi_priv.pwd_admin->maxlen = pwdcfg.max_length;
if (pwdcfg.password_state & TLMI_PAP_PWD)
tlmi_priv.pwd_admin->valid = true;
tlmi_priv.pwd_power = kzalloc(sizeof(struct tlmi_pwd_setting), GFP_KERNEL);
if (!tlmi_priv.pwd_power) {
ret = -ENOMEM;
goto fail_clear_attr;
}
strscpy(tlmi_priv.pwd_power->display_name, "power-on", TLMI_PWDTYPE_MAXLEN);
strscpy(tlmi_priv.pwd_power->kbdlang, "us", TLMI_LANG_MAXLEN);
tlmi_priv.pwd_power->encoding = TLMI_ENCODING_ASCII;
tlmi_priv.pwd_power->pwd_type = "pop";
tlmi_priv.pwd_power->role = "power-on";
tlmi_priv.pwd_power->minlen = pwdcfg.min_length;
tlmi_priv.pwd_power->maxlen = pwdcfg.max_length;
if (pwdcfg.password_state & TLMI_POP_PWD)
tlmi_priv.pwd_power->valid = true;
return 0;
fail_clear_attr:
for (i = 0; i < TLMI_SETTINGS_COUNT; ++i)
kfree(tlmi_priv.setting[i]);
return ret;
}
static void tlmi_remove(struct wmi_device *wdev)
{
tlmi_release_attr();
device_destroy(fw_attr_class, MKDEV(0, 0));
fw_attributes_class_put();
}
static int tlmi_probe(struct wmi_device *wdev, const void *context)
{
tlmi_analyze();
return tlmi_sysfs_init();
}
static const struct wmi_device_id tlmi_id_table[] = {
{ .guid_string = LENOVO_BIOS_SETTING_GUID },
{ }
};
static struct wmi_driver tlmi_driver = {
.driver = {
.name = "think-lmi",
},
.id_table = tlmi_id_table,
.probe = tlmi_probe,
.remove = tlmi_remove,
};
MODULE_AUTHOR("Sugumaran L <slacshiminar@lenovo.com>");
MODULE_AUTHOR("Mark Pearson <markpearson@lenovo.com>");
MODULE_AUTHOR("Corentin Chary <corentin.chary@gmail.com>");
MODULE_DESCRIPTION("ThinkLMI Driver");
MODULE_LICENSE("GPL");
module_wmi_driver(tlmi_driver);
/* 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_ */
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