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platform/x86: Introduce support for Systems Management Driver over WMI for Dell Systems

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The Dell WMI Systems Management Driver provides a sysfs
interface for systems management to enable BIOS configuration
capability on certain Dell Systems.

This driver allows user to configure Dell systems with a
uniform common interface. To facilitate this, the patch
introduces a generic way for driver to be able to create
configurable BIOS Attributes available in Setup (F2) screen.

Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: mark gross <mgross@linux.intel.com>

Co-developed-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Co-developed-by: Prasanth KSR <prasanth.ksr@dell.com>
Signed-off-by: Prasanth KSR <prasanth.ksr@dell.com>
Signed-off-by: Divya Bharathi <divya.bharathi@dell.com>
Link: https://lore.kernel.org/r/20201027134944.316730-1-divya.bharathi@dell.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Divya Bharathi 2020-10-27 19:19:44 +05:30 committed by Hans de Goede
parent 56afb8d480
commit e8a60aa740
13 changed files with 2123 additions and 0 deletions
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224
Documentation/ABI/testing/sysfs-class-firmware-attributes Normal file
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@ -0,0 +1,224 @@
What: /sys/class/firmware-attributes/*/attributes/*/
Date: February 2021
KernelVersion: 5.11
Contact: Divya Bharathi <Divya.Bharathi@Dell.com>,
Mario Limonciello <mario.limonciello@dell.com>,
Prasanth KSR <prasanth.ksr@dell.com>
Description:
A sysfs interface for systems management software to enable
configuration capability on supported systems. This directory
exposes interfaces for interacting with configuration options.
Unless otherwise specified in an attribute description all attributes are optional
and will accept UTF-8 input.
type: A file that can be read to obtain the type of attribute. This attribute is
mandatory.
The following are known types:
- enumeration: a set of pre-defined valid values
- integer: a range of numerical values
- string
All attribute types support the following values:
current_value: A file that can be read to obtain the current
value of the <attr>.
This file can also be written to in order to update the value of a
<attr>
This attribute is mandatory.
default_value: A file that can be read to obtain the default
value of the <attr>
display_name: A file that can be read to obtain a user friendly
description of the at <attr>
display_name_language_code: A file that can be read to obtain
the IETF language tag corresponding to the
"display_name" of the <attr>
"enumeration"-type specific properties:
possible_values: A file that can be read to obtain the possible
values of the <attr>. Values are separated using
semi-colon (``;``).
"integer"-type specific properties:
min_value: A file that can be read to obtain the lower
bound value of the <attr>
max_value: A file that can be read to obtain the upper
bound value of the <attr>
scalar_increment: A file that can be read to obtain the scalar value used for
increments of current_value this attribute accepts.
"string"-type specific properties:
max_length: A file that can be read to obtain the maximum
length value of the <attr>
min_length: A file that can be read to obtain the minimum
length value of the <attr>
Dell specific class extensions
--------------------------
On Dell systems the following additional attributes are available:
dell_modifier: A file that can be read to obtain attribute-level
dependency rule. It says an attribute X will become read-only or
suppressed, if/if-not attribute Y is configured.
modifier rules can be in following format:
[ReadOnlyIf:<attribute>=<value>]
[ReadOnlyIfNot:<attribute>=<value>]
[SuppressIf:<attribute>=<value>]
[SuppressIfNot:<attribute>=<value>]
For example:
AutoOnFri/dell_modifier has value,
[SuppressIfNot:AutoOn=SelectDays]
This means AutoOnFri will be suppressed in BIOS setup if AutoOn
attribute is not "SelectDays" and its value will not be effective
through sysfs until this rule is met.
Enumeration attributes also support the following:
dell_value_modifier: A file that can be read to obtain value-level dependency.
This file is similar to dell_modifier but here, an
attribute's current value will be forcefully changed based
dependent attributes value.
dell_value_modifier rules can be in following format:
<value>[ForceIf:<attribute>=<value>]
<value>[ForceIfNot:<attribute>=<value>]
For example,
LegacyOrom/dell_value_modifier has value:
Disabled[ForceIf:SecureBoot=Enabled]
This means LegacyOrom's current value will be forced to
"Disabled" in BIOS setup if SecureBoot is Enabled and its
value will not be effective through sysfs until this rule is
met.
What: /sys/class/firmware-attributes/*/authentication/
Date: February 2021
KernelVersion: 5.11
Contact: Divya Bharathi <Divya.Bharathi@Dell.com>,
Mario Limonciello <mario.limonciello@dell.com>,
Prasanth KSR <prasanth.ksr@dell.com>
Devices support various authentication mechanisms which can be exposed
as a separate configuration object.
For example a "BIOS Admin" password and "System" Password can be set,
reset or cleared using these attributes.
- An "Admin" password is used for preventing modification to the BIOS
settings.
- A "System" password is required to boot a machine.
Change in any of these two authentication methods will also generate an
uevent KOBJ_CHANGE.
is_enabled: A file that can be read to obtain a 0/1 flag to see if
<attr> authentication is enabled.
This attribute is mandatory.
role: The type of authentication used.
This attribute is mandatory.
Known types:
bios-admin: Representing BIOS administrator password
power-on: Representing a password required to use
the system
mechanism: The means of authentication. This attribute is mandatory.
Only supported type currently is "password".
max_password_length: A file that can be read to obtain the
maximum length of the Password
min_password_length: A file that can be read to obtain the
minimum length of the Password
current_password: A write only value used for privileged access such as
setting attributes when a system or admin password is set
or resetting to a new password
This attribute is mandatory when mechanism == "password".
new_password: A write only value that when used in tandem with
current_password will reset a system or admin password.
Note, password management is session specific. If Admin password is set,
same password must be written into current_password file (required for
password-validation) and must be cleared once the session is over.
For example:
echo "password" > current_password
echo "disabled" > TouchScreen/current_value
echo "" > current_password
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
require password validation.
What: /sys/class/firmware-attributes/*/attributes/pending_reboot
Date: February 2021
KernelVersion: 5.11
Contact: Divya Bharathi <Divya.Bharathi@Dell.com>,
Mario Limonciello <mario.limonciello@dell.com>,
Prasanth KSR <prasanth.ksr@dell.com>
Description:
A read-only attribute reads 1 if a reboot is necessary to apply
pending BIOS attribute changes. Also, an uevent_KOBJ_CHANGE is
generated when it changes to 1.
0: All BIOS attributes setting are current
1: A reboot is necessary to get pending BIOS attribute changes
applied
Note, userspace applications need to follow below steps for efficient
BIOS management,
1. Check if admin password is set. If yes, follow session method for
password management as briefed under authentication section above.
2. Before setting any attribute, check if it has any modifiers
or value_modifiers. If yes, incorporate them and then modify
attribute.
Drivers may emit a CHANGE uevent when this value changes and userspace
may check it again.
What: /sys/class/firmware-attributes/*/attributes/reset_bios
Date: February 2021
KernelVersion: 5.11
Contact: Divya Bharathi <Divya.Bharathi@Dell.com>,
Mario Limonciello <mario.limonciello@dell.com>,
Prasanth KSR <prasanth.ksr@dell.com>
Description:
This attribute can be used to reset the BIOS Configuration.
Specifically, it tells which type of reset BIOS configuration is being
requested on the host.
Reading from it returns a list of supported options encoded as:
'builtinsafe' (Built in safe configuration profile)
'lastknowngood' (Last known good saved configuration profile)
'factory' (Default factory settings configuration profile)
'custom' (Custom saved configuration profile)
The currently selected option is printed in square brackets as
shown below:
# echo "factory" > /sys/class/firmware-attributes/*/device/attributes/reset_bios
# cat /sys/class/firmware-attributes/*/device/attributes/reset_bios
# builtinsafe lastknowngood [factory] custom
Note that any changes to this attribute requires a reboot
for changes to take effect.

8
MAINTAINERS
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@ -4991,6 +4991,14 @@ M: Mario Limonciello <mario.limonciello@dell.com>
S: Maintained S: Maintained
F: drivers/platform/x86/dell-wmi-descriptor.c F: drivers/platform/x86/dell-wmi-descriptor.c
DELL WMI SYSMAN DRIVER
M: Divya Bharathi <divya.bharathi@dell.com>
M: Mario Limonciello <mario.limonciello@dell.com>
M: Prasanth Ksr <prasanth.ksr@dell.com>
L: platform-driver-x86@vger.kernel.org
S: Maintained
F: drivers/platform/x86/dell-wmi-syman/*
DELL WMI NOTIFICATIONS DRIVER DELL WMI NOTIFICATIONS DRIVER
M: Matthew Garrett <mjg59@srcf.ucam.org> M: Matthew Garrett <mjg59@srcf.ucam.org>
M: Pali Rohár <pali@kernel.org> M: Pali Rohár <pali@kernel.org>

12
drivers/platform/x86/Kconfig
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@ -430,6 +430,18 @@ config DELL_WMI
To compile this driver as a module, choose M here: the module will To compile this driver as a module, choose M here: the module will
be called dell-wmi. be called dell-wmi.
config DELL_WMI_SYSMAN
tristate "Dell WMI-based Systems management driver"
depends on ACPI_WMI
depends on DMI
select NLS
help
This driver allows changing BIOS settings on many Dell machines from
2018 and newer without the use of any additional software.
To compile this driver as a module, choose M here: the module will
be called dell-wmi-sysman.
config DELL_WMI_DESCRIPTOR config DELL_WMI_DESCRIPTOR
tristate tristate
depends on ACPI_WMI depends on ACPI_WMI

1
drivers/platform/x86/Makefile
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@ -47,6 +47,7 @@ obj-$(CONFIG_DELL_WMI) += dell-wmi.o
obj-$(CONFIG_DELL_WMI_DESCRIPTOR) += dell-wmi-descriptor.o obj-$(CONFIG_DELL_WMI_DESCRIPTOR) += dell-wmi-descriptor.o
obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o
obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o
obj-$(CONFIG_DELL_WMI_SYSMAN) += dell-wmi-sysman/
# Fujitsu # Fujitsu
obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o obj-$(CONFIG_AMILO_RFKILL) += amilo-rfkill.o

8
drivers/platform/x86/dell-wmi-sysman/Makefile Normal file
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@ -0,0 +1,8 @@
obj-$(CONFIG_DELL_WMI_SYSMAN) += dell-wmi-sysman.o
dell-wmi-sysman-objs := sysman.o \
enum-attributes.o \
int-attributes.o \
string-attributes.o \
passobj-attributes.o \
biosattr-interface.o \
passwordattr-interface.o

186
drivers/platform/x86/dell-wmi-sysman/biosattr-interface.c Normal file
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@ -0,0 +1,186 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to SET methods under BIOS attributes interface GUID for use
* with dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#include <linux/wmi.h>
#include "dell-wmi-sysman.h"
#define SETDEFAULTVALUES_METHOD_ID 0x02
#define SETBIOSDEFAULTS_METHOD_ID 0x03
#define SETATTRIBUTE_METHOD_ID 0x04
static int call_biosattributes_interface(struct wmi_device *wdev, char *in_args, size_t size,
int method_id)
{
struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
struct acpi_buffer input;
union acpi_object *obj;
acpi_status status;
int ret = -EIO;
input.length = (acpi_size) size;
input.pointer = in_args;
status = wmidev_evaluate_method(wdev, 0, method_id, &input, &output);
if (ACPI_FAILURE(status))
return -EIO;
obj = (union acpi_object *)output.pointer;
if (obj->type == ACPI_TYPE_INTEGER)
ret = obj->integer.value;
if (wmi_priv.pending_changes == 0) {
wmi_priv.pending_changes = 1;
/* let userland know it may need to check reboot pending again */
kobject_uevent(&wmi_priv.class_dev->kobj, KOBJ_CHANGE);
}
kfree(output.pointer);
return map_wmi_error(ret);
}
/**
* set_attribute() - Update an attribute value
* @a_name: The attribute name
* @a_value: The attribute value
*
* Sets an attribute to new value
*/
int set_attribute(const char *a_name, const char *a_value)
{
size_t security_area_size, buffer_size;
size_t a_name_size, a_value_size;
char *buffer = NULL, *start;
int ret;
mutex_lock(&wmi_priv.mutex);
if (!wmi_priv.bios_attr_wdev) {
ret = -ENODEV;
goto out;
}
/* build/calculate buffer */
security_area_size = calculate_security_buffer(wmi_priv.current_admin_password);
a_name_size = calculate_string_buffer(a_name);
a_value_size = calculate_string_buffer(a_value);
buffer_size = security_area_size + a_name_size + a_value_size;
buffer = kzalloc(buffer_size, GFP_KERNEL);
if (!buffer) {
ret = -ENOMEM;
goto out;
}
/* build security area */
populate_security_buffer(buffer, wmi_priv.current_admin_password);
/* build variables to set */
start = buffer + security_area_size;
ret = populate_string_buffer(start, a_name_size, a_name);
if (ret < 0)
goto out;
start += ret;
ret = populate_string_buffer(start, a_value_size, a_value);
if (ret < 0)
goto out;
print_hex_dump_bytes("set attribute data: ", DUMP_PREFIX_NONE, buffer, buffer_size);
ret = call_biosattributes_interface(wmi_priv.bios_attr_wdev,
buffer, buffer_size,
SETATTRIBUTE_METHOD_ID);
if (ret == -EOPNOTSUPP)
dev_err(&wmi_priv.bios_attr_wdev->dev, "admin password must be configured\n");
else if (ret == -EACCES)
dev_err(&wmi_priv.bios_attr_wdev->dev, "invalid password\n");
out:
kfree(buffer);
mutex_unlock(&wmi_priv.mutex);
return ret;
}
/**
* set_bios_defaults() - Resets BIOS defaults
* @deftype: the type of BIOS value reset to issue.
*
* Resets BIOS defaults
*/
int set_bios_defaults(u8 deftype)
{
size_t security_area_size, buffer_size;
size_t integer_area_size = sizeof(u8);
char *buffer = NULL;
u8 *defaultType;
int ret;
mutex_lock(&wmi_priv.mutex);
if (!wmi_priv.bios_attr_wdev) {
ret = -ENODEV;
goto out;
}
security_area_size = calculate_security_buffer(wmi_priv.current_admin_password);
buffer_size = security_area_size + integer_area_size;
buffer = kzalloc(buffer_size, GFP_KERNEL);
if (!buffer) {
ret = -ENOMEM;
goto out;
}
/* build security area */
populate_security_buffer(buffer, wmi_priv.current_admin_password);
defaultType = buffer + security_area_size;
*defaultType = deftype;
ret = call_biosattributes_interface(wmi_priv.bios_attr_wdev, buffer, buffer_size,
SETBIOSDEFAULTS_METHOD_ID);
if (ret)
dev_err(&wmi_priv.bios_attr_wdev->dev, "reset BIOS defaults failed: %d\n", ret);
kfree(buffer);
out:
mutex_unlock(&wmi_priv.mutex);
return ret;
}
static int bios_attr_set_interface_probe(struct wmi_device *wdev, const void *context)
{
mutex_lock(&wmi_priv.mutex);
wmi_priv.bios_attr_wdev = wdev;
mutex_unlock(&wmi_priv.mutex);
return 0;
}
static int bios_attr_set_interface_remove(struct wmi_device *wdev)
{
mutex_lock(&wmi_priv.mutex);
wmi_priv.bios_attr_wdev = NULL;
mutex_unlock(&wmi_priv.mutex);
return 0;
}
static const struct wmi_device_id bios_attr_set_interface_id_table[] = {
{ .guid_string = DELL_WMI_BIOS_ATTRIBUTES_INTERFACE_GUID },
{ },
};
static struct wmi_driver bios_attr_set_interface_driver = {
.driver = {
.name = DRIVER_NAME
},
.probe = bios_attr_set_interface_probe,
.remove = bios_attr_set_interface_remove,
.id_table = bios_attr_set_interface_id_table,
};
int init_bios_attr_set_interface(void)
{
return wmi_driver_register(&bios_attr_set_interface_driver);
}
void exit_bios_attr_set_interface(void)
{
wmi_driver_unregister(&bios_attr_set_interface_driver);
}
MODULE_DEVICE_TABLE(wmi, bios_attr_set_interface_id_table);

191
drivers/platform/x86/dell-wmi-sysman/dell-wmi-sysman.h Normal file
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@ -0,0 +1,191 @@
/* SPDX-License-Identifier: GPL-2.0
* Definitions for kernel modules using Dell WMI System Management Driver
*
* Copyright (c) 2020 Dell Inc.
*/
#ifndef _DELL_WMI_BIOS_ATTR_H_
#define _DELL_WMI_BIOS_ATTR_H_
#include <linux/wmi.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/capability.h>
#define DRIVER_NAME "dell-wmi-sysman"
#define MAX_BUFF 512
#define DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID "F1DDEE52-063C-4784-A11E-8A06684B9BF5"
#define DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID "F1DDEE52-063C-4784-A11E-8A06684B9BFA"
#define DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID "F1DDEE52-063C-4784-A11E-8A06684B9BF9"
#define DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID "0894B8D6-44A6-4719-97D7-6AD24108BFD4"
#define DELL_WMI_BIOS_ATTRIBUTES_INTERFACE_GUID "F1DDEE52-063C-4784-A11E-8A06684B9BF4"
#define DELL_WMI_BIOS_PASSWORD_INTERFACE_GUID "70FE8229-D03B-4214-A1C6-1F884B1A892A"
struct enumeration_data {
struct kobject *attr_name_kobj;
char display_name_language_code[MAX_BUFF];
char dell_value_modifier[MAX_BUFF];
char possible_values[MAX_BUFF];
char attribute_name[MAX_BUFF];
char default_value[MAX_BUFF];
char dell_modifier[MAX_BUFF];
char display_name[MAX_BUFF];
};
struct integer_data {
struct kobject *attr_name_kobj;
char display_name_language_code[MAX_BUFF];
char attribute_name[MAX_BUFF];
char dell_modifier[MAX_BUFF];
char display_name[MAX_BUFF];
int scalar_increment;
int default_value;
int min_value;
int max_value;
};
struct str_data {
struct kobject *attr_name_kobj;
char display_name_language_code[MAX_BUFF];
char attribute_name[MAX_BUFF];
char display_name[MAX_BUFF];
char default_value[MAX_BUFF];
char dell_modifier[MAX_BUFF];
int min_length;
int max_length;
};
struct po_data {
struct kobject *attr_name_kobj;
char attribute_name[MAX_BUFF];
int min_password_length;
int max_password_length;
};
struct wmi_sysman_priv {
char current_admin_password[MAX_BUFF];
char current_system_password[MAX_BUFF];
struct wmi_device *password_attr_wdev;
struct wmi_device *bios_attr_wdev;
struct kset *authentication_dir_kset;
struct kset *main_dir_kset;
struct device *class_dev;
struct enumeration_data *enumeration_data;
int enumeration_instances_count;
struct integer_data *integer_data;
int integer_instances_count;
struct str_data *str_data;
int str_instances_count;
struct po_data *po_data;
int po_instances_count;
bool pending_changes;
struct mutex mutex;
};
/* global structure used by multiple WMI interfaces */
extern struct wmi_sysman_priv wmi_priv;
enum { ENUM, INT, STR, PO };
enum {
ATTR_NAME,
DISPL_NAME_LANG_CODE,
DISPLAY_NAME,
DEFAULT_VAL,
CURRENT_VAL,
MODIFIER
};
#define get_instance_id(type) \
static int get_##type##_instance_id(struct kobject *kobj) \
{ \
int i; \
for (i = 0; i <= wmi_priv.type##_instances_count; i++) { \
if (!(strcmp(kobj->name, wmi_priv.type##_data[i].attribute_name)))\
return i; \
} \
return -EIO; \
}
#define attribute_s_property_show(name, type) \
static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \
char *buf) \
{ \
int i = get_##type##_instance_id(kobj); \
if (i >= 0) \
return sprintf(buf, "%s\n", wmi_priv.type##_data[i].name); \
return 0; \
}
#define attribute_n_property_show(name, type) \
static ssize_t name##_show(struct kobject *kobj, struct kobj_attribute *attr, \
char *buf) \
{ \
int i = get_##type##_instance_id(kobj); \
if (i >= 0) \
return sprintf(buf, "%d\n", wmi_priv.type##_data[i].name); \
return 0; \
}
#define attribute_property_store(curr_val, type) \
static ssize_t curr_val##_store(struct kobject *kobj, \
struct kobj_attribute *attr, \
const char *buf, size_t count) \
{ \
char *p, *buf_cp; \
int i, ret = -EIO; \
buf_cp = kstrdup(buf, GFP_KERNEL); \
if (!buf_cp) \
return -ENOMEM; \
p = memchr(buf_cp, '\n', count); \
\
if (p != NULL) \
*p = '\0'; \
i = get_##type##_instance_id(kobj); \
if (i >= 0) \
ret = validate_##type##_input(i, buf_cp); \
if (!ret) \
ret = set_attribute(kobj->name, buf_cp); \
kfree(buf_cp); \
return ret ? ret : count; \
}
union acpi_object *get_wmiobj_pointer(int instance_id, const char *guid_string);
int get_instance_count(const char *guid_string);
void strlcpy_attr(char *dest, char *src);
int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
struct kobject *attr_name_kobj);
int alloc_enum_data(void);
void exit_enum_attributes(void);
int populate_int_data(union acpi_object *integer_obj, int instance_id,
struct kobject *attr_name_kobj);
int alloc_int_data(void);
void exit_int_attributes(void);
int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj);
int alloc_str_data(void);
void exit_str_attributes(void);
int populate_po_data(union acpi_object *po_obj, int instance_id, struct kobject *attr_name_kobj);
int alloc_po_data(void);
void exit_po_attributes(void);
int set_attribute(const char *a_name, const char *a_value);
int set_bios_defaults(u8 defType);
void exit_bios_attr_set_interface(void);
int init_bios_attr_set_interface(void);
int map_wmi_error(int error_code);
size_t calculate_string_buffer(const char *str);
size_t calculate_security_buffer(char *authentication);
void populate_security_buffer(char *buffer, char *authentication);
ssize_t populate_string_buffer(char *buffer, size_t buffer_len, const char *str);
int set_new_password(const char *password_type, const char *new);
int init_bios_attr_pass_interface(void);
void exit_bios_attr_pass_interface(void);
#endif

189
drivers/platform/x86/dell-wmi-sysman/enum-attributes.c Normal file
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@ -0,0 +1,189 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to enumeration type attributes under
* BIOS Enumeration GUID for use with dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#include "dell-wmi-sysman.h"
get_instance_id(enumeration);
static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int instance_id = get_enumeration_instance_id(kobj);
union acpi_object *obj;
ssize_t ret;
if (instance_id < 0)
return instance_id;
/* need to use specific instance_id and guid combination to get right data */
obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
if (!obj)
return -EIO;
if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_STRING) {
kfree(obj);
return -EINVAL;
}
ret = snprintf(buf, PAGE_SIZE, "%s\n", obj->package.elements[CURRENT_VAL].string.pointer);
kfree(obj);
return ret;
}
/**
* validate_enumeration_input() - Validate input of current_value against possible values
* @instance_id: The instance on which input is validated
* @buf: Input value
*/
static int validate_enumeration_input(int instance_id, const char *buf)
{
char *options, *tmp, *p;
int ret = -EINVAL;
options = tmp = kstrdup(wmi_priv.enumeration_data[instance_id].possible_values,
GFP_KERNEL);
if (!options)
return -ENOMEM;
while ((p = strsep(&options, ";")) != NULL) {
if (!*p)
continue;
if (!strcasecmp(p, buf)) {
ret = 0;
break;
}
}
kfree(tmp);
return ret;
}
attribute_s_property_show(display_name_language_code, enumeration);
static struct kobj_attribute displ_langcode =
__ATTR_RO(display_name_language_code);
attribute_s_property_show(display_name, enumeration);
static struct kobj_attribute displ_name =
__ATTR_RO(display_name);
attribute_s_property_show(default_value, enumeration);
static struct kobj_attribute default_val =
__ATTR_RO(default_value);
attribute_property_store(current_value, enumeration);
static struct kobj_attribute current_val =
__ATTR_RW_MODE(current_value, 0600);
attribute_s_property_show(dell_modifier, enumeration);
static struct kobj_attribute modifier =
__ATTR_RO(dell_modifier);
attribute_s_property_show(dell_value_modifier, enumeration);
static struct kobj_attribute value_modfr =
__ATTR_RO(dell_value_modifier);
attribute_s_property_show(possible_values, enumeration);
static struct kobj_attribute poss_val =
__ATTR_RO(possible_values);
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "enumeration\n");
}
static struct kobj_attribute type =
__ATTR_RO(type);
static struct attribute *enumeration_attrs[] = {
&displ_langcode.attr,
&displ_name.attr,
&default_val.attr,
&current_val.attr,
&modifier.attr,
&value_modfr.attr,
&poss_val.attr,
&type.attr,
NULL,
};
static const struct attribute_group enumeration_attr_group = {
.attrs = enumeration_attrs,
};
int alloc_enum_data(void)
{
int ret = 0;
wmi_priv.enumeration_instances_count =
get_instance_count(DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
wmi_priv.enumeration_data = kcalloc(wmi_priv.enumeration_instances_count,
sizeof(struct enumeration_data), GFP_KERNEL);
if (!wmi_priv.enumeration_data) {
wmi_priv.enumeration_instances_count = 0;
ret = -ENOMEM;
}
return ret;
}
/**
* populate_enum_data() - Populate all properties of an instance under enumeration attribute
* @enumeration_obj: ACPI object with enumeration data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
*/
int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
struct kobject *attr_name_kobj)
{
int i, next_obj, value_modifier_count, possible_values_count;
wmi_priv.enumeration_data[instance_id].attr_name_kobj = attr_name_kobj;
strlcpy_attr(wmi_priv.enumeration_data[instance_id].attribute_name,
enumeration_obj[ATTR_NAME].string.pointer);
strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name_language_code,
enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer);
strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name,
enumeration_obj[DISPLAY_NAME].string.pointer);
strlcpy_attr(wmi_priv.enumeration_data[instance_id].default_value,
enumeration_obj[DEFAULT_VAL].string.pointer);
strlcpy_attr(wmi_priv.enumeration_data[instance_id].dell_modifier,
enumeration_obj[MODIFIER].string.pointer);
next_obj = MODIFIER + 1;
value_modifier_count = (uintptr_t)enumeration_obj[next_obj].string.pointer;
for (i = 0; i < value_modifier_count; i++) {
strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier,
enumeration_obj[++next_obj].string.pointer);
strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";");
}
possible_values_count = (uintptr_t) enumeration_obj[++next_obj].string.pointer;
for (i = 0; i < possible_values_count; i++) {
strcat(wmi_priv.enumeration_data[instance_id].possible_values,
enumeration_obj[++next_obj].string.pointer);
strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";");
}
return sysfs_create_group(attr_name_kobj, &enumeration_attr_group);
}
/**
* exit_enum_attributes() - Clear all attribute data
*
* Clears all data allocated for this group of attributes
*/
void exit_enum_attributes(void)
{
int instance_id;
for (instance_id = 0; instance_id < wmi_priv.enumeration_instances_count; instance_id++) {
if (wmi_priv.enumeration_data[instance_id].attr_name_kobj)
sysfs_remove_group(wmi_priv.enumeration_data[instance_id].attr_name_kobj,
&enumeration_attr_group);
}
kfree(wmi_priv.enumeration_data);
}

173
drivers/platform/x86/dell-wmi-sysman/int-attributes.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to integer type attributes under BIOS Integer GUID for use with
* dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#include "dell-wmi-sysman.h"
enum int_properties {MIN_VALUE = 6, MAX_VALUE, SCALAR_INCR};
get_instance_id(integer);
static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int instance_id = get_integer_instance_id(kobj);
union acpi_object *obj;
ssize_t ret;
if (instance_id < 0)
return instance_id;
/* need to use specific instance_id and guid combination to get right data */
obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID);
if (!obj)
return -EIO;
if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_INTEGER) {
kfree(obj);
return -EINVAL;
}
ret = snprintf(buf, PAGE_SIZE, "%lld\n", obj->package.elements[CURRENT_VAL].integer.value);
kfree(obj);
return ret;
}
/**
* validate_integer_input() - Validate input of current_value against lower and upper bound
* @instance_id: The instance on which input is validated
* @buf: Input value
*/
static int validate_integer_input(int instance_id, const char *buf)
{
int in_val;
int ret;
ret = kstrtoint(buf, 0, &in_val);
if (ret)
return ret;
if (in_val < wmi_priv.integer_data[instance_id].min_value ||
in_val > wmi_priv.integer_data[instance_id].max_value)
return -EINVAL;
return ret;
}
attribute_s_property_show(display_name_language_code, integer);
static struct kobj_attribute integer_displ_langcode =
__ATTR_RO(display_name_language_code);
attribute_s_property_show(display_name, integer);
static struct kobj_attribute integer_displ_name =
__ATTR_RO(display_name);
attribute_n_property_show(default_value, integer);
static struct kobj_attribute integer_default_val =
__ATTR_RO(default_value);
attribute_property_store(current_value, integer);
static struct kobj_attribute integer_current_val =
__ATTR_RW_MODE(current_value, 0600);
attribute_s_property_show(dell_modifier, integer);
static struct kobj_attribute integer_modifier =
__ATTR_RO(dell_modifier);
attribute_n_property_show(min_value, integer);
static struct kobj_attribute integer_lower_bound =
__ATTR_RO(min_value);
attribute_n_property_show(max_value, integer);
static struct kobj_attribute integer_upper_bound =
__ATTR_RO(max_value);
attribute_n_property_show(scalar_increment, integer);
static struct kobj_attribute integer_scalar_increment =
__ATTR_RO(scalar_increment);
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "integer\n");
}
static struct kobj_attribute integer_type =
__ATTR_RO(type);
static struct attribute *integer_attrs[] = {
&integer_displ_langcode.attr,
&integer_displ_name.attr,
&integer_default_val.attr,
&integer_current_val.attr,
&integer_modifier.attr,
&integer_lower_bound.attr,
&integer_upper_bound.attr,
&integer_scalar_increment.attr,
&integer_type.attr,
NULL,
};
static const struct attribute_group integer_attr_group = {
.attrs = integer_attrs,
};
int alloc_int_data(void)
{
int ret = 0;
wmi_priv.integer_instances_count = get_instance_count(DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID);
wmi_priv.integer_data = kcalloc(wmi_priv.integer_instances_count,
sizeof(struct integer_data), GFP_KERNEL);
if (!wmi_priv.integer_data) {
wmi_priv.integer_instances_count = 0;
ret = -ENOMEM;
}
return ret;
}
/**
* populate_int_data() - Populate all properties of an instance under integer attribute
* @integer_obj: ACPI object with integer data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
*/
int populate_int_data(union acpi_object *integer_obj, int instance_id,
struct kobject *attr_name_kobj)
{
wmi_priv.integer_data[instance_id].attr_name_kobj = attr_name_kobj;
strlcpy_attr(wmi_priv.integer_data[instance_id].attribute_name,
integer_obj[ATTR_NAME].string.pointer);
strlcpy_attr(wmi_priv.integer_data[instance_id].display_name_language_code,
integer_obj[DISPL_NAME_LANG_CODE].string.pointer);
strlcpy_attr(wmi_priv.integer_data[instance_id].display_name,
integer_obj[DISPLAY_NAME].string.pointer);
wmi_priv.integer_data[instance_id].default_value =
(uintptr_t)integer_obj[DEFAULT_VAL].string.pointer;
strlcpy_attr(wmi_priv.integer_data[instance_id].dell_modifier,
integer_obj[MODIFIER].string.pointer);
wmi_priv.integer_data[instance_id].min_value =
(uintptr_t)integer_obj[MIN_VALUE].string.pointer;
wmi_priv.integer_data[instance_id].max_value =
(uintptr_t)integer_obj[MAX_VALUE].string.pointer;
wmi_priv.integer_data[instance_id].scalar_increment =
(uintptr_t)integer_obj[SCALAR_INCR].string.pointer;
return sysfs_create_group(attr_name_kobj, &integer_attr_group);
}
/**
* exit_int_attributes() - Clear all attribute data
*
* Clears all data allocated for this group of attributes
*/
void exit_int_attributes(void)
{
int instance_id;
for (instance_id = 0; instance_id < wmi_priv.integer_instances_count; instance_id++) {
if (wmi_priv.integer_data[instance_id].attr_name_kobj)
sysfs_remove_group(wmi_priv.integer_data[instance_id].attr_name_kobj,
&integer_attr_group);
}
kfree(wmi_priv.integer_data);
}

194
drivers/platform/x86/dell-wmi-sysman/passobj-attributes.c Normal file
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// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to password object type attributes under BIOS Password Object GUID for
* use with dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#include "dell-wmi-sysman.h"
enum po_properties {IS_PASS_SET = 1, MIN_PASS_LEN, MAX_PASS_LEN};
get_instance_id(po);
static ssize_t is_enabled_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
int instance_id = get_po_instance_id(kobj);
union acpi_object *obj;
ssize_t ret;
if (instance_id < 0)
return instance_id;
/* need to use specific instance_id and guid combination to get right data */
obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID);
if (!obj)
return -EIO;
if (obj->package.elements[IS_PASS_SET].type != ACPI_TYPE_INTEGER) {
kfree(obj);
return -EINVAL;
}
ret = snprintf(buf, PAGE_SIZE, "%lld\n", obj->package.elements[IS_PASS_SET].integer.value);
kfree(obj);
return ret;
}
struct kobj_attribute po_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)
{
char *target = NULL;
int length;
length = strlen(buf);
if (buf[length-1] == '\n')
length--;
/* firmware does verifiation of min/max password length,
* hence only check for not exceeding MAX_BUFF here.
*/
if (length >= MAX_BUFF)
return -EINVAL;
if (strcmp(kobj->name, "Admin") == 0)
target = wmi_priv.current_admin_password;
else if (strcmp(kobj->name, "System") == 0)
target = wmi_priv.current_system_password;
if (!target)
return -EIO;
memcpy(target, buf, length);
target[length] = '\0';
return count;
}
struct kobj_attribute po_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)
{
char *p, *buf_cp;
int ret;
buf_cp = kstrdup(buf, GFP_KERNEL);
if (!buf_cp)
return -ENOMEM;
p = memchr(buf_cp, '\n', count);
if (p != NULL)
*p = '\0';
if (strlen(buf_cp) > MAX_BUFF) {
ret = -EINVAL;
goto out;
}
ret = set_new_password(kobj->name, buf_cp);
out:
kfree(buf_cp);
return ret ? ret : count;
}
struct kobj_attribute po_new_password =
__ATTR_WO(new_password);
attribute_n_property_show(min_password_length, po);
struct kobj_attribute po_min_pass_length =
__ATTR_RO(min_password_length);
attribute_n_property_show(max_password_length, po);
struct kobj_attribute po_max_pass_length =
__ATTR_RO(max_password_length);
static ssize_t mechanism_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "password\n");
}
struct kobj_attribute po_mechanism =
__ATTR_RO(mechanism);
static ssize_t role_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
if (strcmp(kobj->name, "Admin") == 0)
return sprintf(buf, "bios-admin\n");
else if (strcmp(kobj->name, "System") == 0)
return sprintf(buf, "power-on\n");
return -EIO;
}
struct kobj_attribute po_role =
__ATTR_RO(role);
static struct attribute *po_attrs[] = {
&po_is_pass_set.attr,
&po_min_pass_length.attr,
&po_max_pass_length.attr,
&po_current_password.attr,
&po_new_password.attr,
&po_role.attr,
&po_mechanism.attr,
NULL,
};
static const struct attribute_group po_attr_group = {
.attrs = po_attrs,
};
int alloc_po_data(void)
{
int ret = 0;
wmi_priv.po_instances_count = get_instance_count(DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID);
wmi_priv.po_data = kcalloc(wmi_priv.po_instances_count, sizeof(struct po_data), GFP_KERNEL);
if (!wmi_priv.po_data) {
wmi_priv.po_instances_count = 0;
ret = -ENOMEM;
}
return ret;
}
/**
* populate_po_data() - Populate all properties of an instance under password object attribute
* @po_obj: ACPI object with password object data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
*/
int populate_po_data(union acpi_object *po_obj, int instance_id, struct kobject *attr_name_kobj)
{
wmi_priv.po_data[instance_id].attr_name_kobj = attr_name_kobj;
strlcpy_attr(wmi_priv.po_data[instance_id].attribute_name,
po_obj[ATTR_NAME].string.pointer);
wmi_priv.po_data[instance_id].min_password_length =
(uintptr_t)po_obj[MIN_PASS_LEN].string.pointer;
wmi_priv.po_data[instance_id].max_password_length =
(uintptr_t) po_obj[MAX_PASS_LEN].string.pointer;
return sysfs_create_group(attr_name_kobj, &po_attr_group);
}
/**
* exit_po_attributes() - Clear all attribute data
*
* Clears all data allocated for this group of attributes
*/
void exit_po_attributes(void)
{
int instance_id;
for (instance_id = 0; instance_id < wmi_priv.po_instances_count; instance_id++) {
if (wmi_priv.po_data[instance_id].attr_name_kobj)
sysfs_remove_group(wmi_priv.po_data[instance_id].attr_name_kobj,
&po_attr_group);
}
kfree(wmi_priv.po_data);
}

153
drivers/platform/x86/dell-wmi-sysman/passwordattr-interface.c Normal file
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@ -0,0 +1,153 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to SET password methods under BIOS attributes interface GUID
*
* Copyright (c) 2020 Dell Inc.
*/
#include <linux/wmi.h>
#include "dell-wmi-sysman.h"
static int call_password_interface(struct wmi_device *wdev, char *in_args, size_t size)
{
struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
struct acpi_buffer input;
union acpi_object *obj;
acpi_status status;
int ret = -EIO;
input.length = (acpi_size) size;
input.pointer = in_args;
status = wmidev_evaluate_method(wdev, 0, 1, &input, &output);
if (ACPI_FAILURE(status))
return -EIO;
obj = (union acpi_object *)output.pointer;
if (obj->type == ACPI_TYPE_INTEGER)
ret = obj->integer.value;
kfree(output.pointer);
/* let userland know it may need to check is_password_set again */
kobject_uevent(&wmi_priv.class_dev->kobj, KOBJ_CHANGE);
return map_wmi_error(ret);
}
/**
* set_new_password() - Sets a system admin password
* @password_type: The type of password to set
* @new: The new password
*
* Sets the password using plaintext interface
*/
int set_new_password(const char *password_type, const char *new)
{
size_t password_type_size, current_password_size, new_size;
size_t security_area_size, buffer_size;
char *buffer = NULL, *start;
char *current_password;
int ret;
mutex_lock(&wmi_priv.mutex);
if (!wmi_priv.password_attr_wdev) {
ret = -ENODEV;
goto out;
}
if (strcmp(password_type, "Admin") == 0) {
current_password = wmi_priv.current_admin_password;
} else if (strcmp(password_type, "System") == 0) {
current_password = wmi_priv.current_system_password;
} else {
ret = -EINVAL;
dev_err(&wmi_priv.password_attr_wdev->dev, "unknown password type %s\n",
password_type);
goto out;
}
/* build/calculate buffer */
security_area_size = calculate_security_buffer(wmi_priv.current_admin_password);
password_type_size = calculate_string_buffer(password_type);
current_password_size = calculate_string_buffer(current_password);
new_size = calculate_string_buffer(new);
buffer_size = security_area_size + password_type_size + current_password_size + new_size;
buffer = kzalloc(buffer_size, GFP_KERNEL);
if (!buffer) {
ret = -ENOMEM;
goto out;
}
/* build security area */
populate_security_buffer(buffer, wmi_priv.current_admin_password);
/* build variables to set */
start = buffer + security_area_size;
ret = populate_string_buffer(start, password_type_size, password_type);
if (ret < 0)
goto out;
start += ret;
ret = populate_string_buffer(start, current_password_size, current_password);
if (ret < 0)
goto out;
start += ret;
ret = populate_string_buffer(start, new_size, new);
if (ret < 0)
goto out;
print_hex_dump_bytes("set new password data: ", DUMP_PREFIX_NONE, buffer, buffer_size);
ret = call_password_interface(wmi_priv.password_attr_wdev, buffer, buffer_size);
/* clear current_password here and use user input from wmi_priv.current_password */
if (!ret)
memset(current_password, 0, MAX_BUFF);
/* explain to user the detailed failure reason */
else if (ret == -EOPNOTSUPP)
dev_err(&wmi_priv.password_attr_wdev->dev, "admin password must be configured\n");
else if (ret == -EACCES)
dev_err(&wmi_priv.password_attr_wdev->dev, "invalid password\n");
out:
kfree(buffer);
mutex_unlock(&wmi_priv.mutex);
return ret;
}
static int bios_attr_pass_interface_probe(struct wmi_device *wdev, const void *context)
{
mutex_lock(&wmi_priv.mutex);
wmi_priv.password_attr_wdev = wdev;
mutex_unlock(&wmi_priv.mutex);
return 0;
}
static int bios_attr_pass_interface_remove(struct wmi_device *wdev)
{
mutex_lock(&wmi_priv.mutex);
wmi_priv.password_attr_wdev = NULL;
mutex_unlock(&wmi_priv.mutex);
return 0;
}
static const struct wmi_device_id bios_attr_pass_interface_id_table[] = {
{ .guid_string = DELL_WMI_BIOS_PASSWORD_INTERFACE_GUID },
{ },
};
static struct wmi_driver bios_attr_pass_interface_driver = {
.driver = {
.name = DRIVER_NAME"-password"
},
.probe = bios_attr_pass_interface_probe,
.remove = bios_attr_pass_interface_remove,
.id_table = bios_attr_pass_interface_id_table,
};
int init_bios_attr_pass_interface(void)
{
return wmi_driver_register(&bios_attr_pass_interface_driver);
}
void exit_bios_attr_pass_interface(void)
{
wmi_driver_unregister(&bios_attr_pass_interface_driver);
}
MODULE_DEVICE_TABLE(wmi, bios_attr_pass_interface_id_table);

159
drivers/platform/x86/dell-wmi-sysman/string-attributes.c Normal file
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@ -0,0 +1,159 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to string type attributes under BIOS String GUID for use with
* dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#include "dell-wmi-sysman.h"
enum string_properties {MIN_LEN = 6, MAX_LEN};
get_instance_id(str);
static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int instance_id = get_str_instance_id(kobj);
union acpi_object *obj;
ssize_t ret;
if (instance_id < 0)
return -EIO;
/* need to use specific instance_id and guid combination to get right data */
obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID);
if (!obj)
return -EIO;
if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_STRING) {
kfree(obj);
return -EINVAL;
}
ret = snprintf(buf, PAGE_SIZE, "%s\n", obj->package.elements[CURRENT_VAL].string.pointer);
kfree(obj);
return ret;
}
/**
* validate_str_input() - Validate input of current_value against min and max lengths
* @instance_id: The instance on which input is validated
* @buf: Input value
*/
static int validate_str_input(int instance_id, const char *buf)
{
int in_len = strlen(buf);
if ((in_len < wmi_priv.str_data[instance_id].min_length) ||
(in_len > wmi_priv.str_data[instance_id].max_length))
return -EINVAL;
return 0;
}
attribute_s_property_show(display_name_language_code, str);
static struct kobj_attribute str_displ_langcode =
__ATTR_RO(display_name_language_code);
attribute_s_property_show(display_name, str);
static struct kobj_attribute str_displ_name =
__ATTR_RO(display_name);
attribute_s_property_show(default_value, str);
static struct kobj_attribute str_default_val =
__ATTR_RO(default_value);
attribute_property_store(current_value, str);
static struct kobj_attribute str_current_val =
__ATTR_RW_MODE(current_value, 0600);
attribute_s_property_show(dell_modifier, str);
static struct kobj_attribute str_modifier =
__ATTR_RO(dell_modifier);
attribute_n_property_show(min_length, str);
static struct kobj_attribute str_min_length =
__ATTR_RO(min_length);
attribute_n_property_show(max_length, str);
static struct kobj_attribute str_max_length =
__ATTR_RO(max_length);
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "string\n");
}
static struct kobj_attribute str_type =
__ATTR_RO(type);
static struct attribute *str_attrs[] = {
&str_displ_langcode.attr,
&str_displ_name.attr,
&str_default_val.attr,
&str_current_val.attr,
&str_modifier.attr,
&str_min_length.attr,
&str_max_length.attr,
&str_type.attr,
NULL,
};
static const struct attribute_group str_attr_group = {
.attrs = str_attrs,
};
int alloc_str_data(void)
{
int ret = 0;
wmi_priv.str_instances_count = get_instance_count(DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID);
wmi_priv.str_data = kcalloc(wmi_priv.str_instances_count,
sizeof(struct str_data), GFP_KERNEL);
if (!wmi_priv.str_data) {
wmi_priv.str_instances_count = 0;
ret = -ENOMEM;
}
return ret;
}
/**
* populate_str_data() - Populate all properties of an instance under string attribute
* @str_obj: ACPI object with integer data
* @instance_id: The instance to enumerate
* @attr_name_kobj: The parent kernel object
*/
int populate_str_data(union acpi_object *str_obj, int instance_id, struct kobject *attr_name_kobj)
{
wmi_priv.str_data[instance_id].attr_name_kobj = attr_name_kobj;
strlcpy_attr(wmi_priv.str_data[instance_id].attribute_name,
str_obj[ATTR_NAME].string.pointer);
strlcpy_attr(wmi_priv.str_data[instance_id].display_name_language_code,
str_obj[DISPL_NAME_LANG_CODE].string.pointer);
strlcpy_attr(wmi_priv.str_data[instance_id].display_name,
str_obj[DISPLAY_NAME].string.pointer);
strlcpy_attr(wmi_priv.str_data[instance_id].default_value,
str_obj[DEFAULT_VAL].string.pointer);
strlcpy_attr(wmi_priv.str_data[instance_id].dell_modifier,
str_obj[MODIFIER].string.pointer);
wmi_priv.str_data[instance_id].min_length = (uintptr_t)str_obj[MIN_LEN].string.pointer;
wmi_priv.str_data[instance_id].max_length = (uintptr_t) str_obj[MAX_LEN].string.pointer;
return sysfs_create_group(attr_name_kobj, &str_attr_group);
}
/**
* exit_str_attributes() - Clear all attribute data
*
* Clears all data allocated for this group of attributes
*/
void exit_str_attributes(void)
{
int instance_id;
for (instance_id = 0; instance_id < wmi_priv.str_instances_count; instance_id++) {
if (wmi_priv.str_data[instance_id].attr_name_kobj)
sysfs_remove_group(wmi_priv.str_data[instance_id].attr_name_kobj,
&str_attr_group);
}
kfree(wmi_priv.str_data);
}

625
drivers/platform/x86/dell-wmi-sysman/sysman.c Normal file
View File

@ -0,0 +1,625 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Common methods for use with dell-wmi-sysman
*
* Copyright (c) 2020 Dell Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/fs.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/wmi.h>
#include "dell-wmi-sysman.h"
#define MAX_TYPES 4
#include <linux/nls.h>
static struct class firmware_attributes_class = {
.name = "firmware-attributes",
};
struct wmi_sysman_priv wmi_priv = {
.mutex = __MUTEX_INITIALIZER(wmi_priv.mutex),
};
/* reset bios to defaults */
static const char * const reset_types[] = {"builtinsafe", "lastknowngood", "factory", "custom"};
static int reset_option = -1;
/**
* populate_string_buffer() - populates a string buffer
* @buffer: the start of the destination buffer
* @buffer_len: length of the destination buffer
* @str: the string to insert into buffer
*/
ssize_t populate_string_buffer(char *buffer, size_t buffer_len, const char *str)
{
u16 *length = (u16 *)buffer;
u16 *target = length + 1;
int ret;
ret = utf8s_to_utf16s(str, strlen(str), UTF16_HOST_ENDIAN,
target, buffer_len - sizeof(u16));
if (ret < 0) {
dev_err(wmi_priv.class_dev, "UTF16 conversion failed\n");
return ret;
}
if ((ret * sizeof(u16)) > U16_MAX) {
dev_err(wmi_priv.class_dev, "Error string too long\n");
return -ERANGE;
}
*length = ret * sizeof(u16);
return sizeof(u16) + *length;
}
/**
* calculate_string_buffer() - determines size of string buffer for use with BIOS communication
* @str: the string to calculate based upon
*
*/
size_t calculate_string_buffer(const char *str)
{
/* u16 length field + one UTF16 char for each input char */
return sizeof(u16) + strlen(str) * sizeof(u16);
}
/**
* calculate_security_buffer() - determines size of security buffer for authentication scheme
* @authentication: the authentication content
*
* Currently only supported type is Admin password
*/
size_t calculate_security_buffer(char *authentication)
{
if (strlen(authentication) > 0) {
return (sizeof(u32) * 2) + strlen(authentication) +
strlen(authentication) % 2;
}
return sizeof(u32) * 2;
}
/**
* populate_security_buffer() - builds a security buffer for authentication scheme
* @buffer: the buffer to populate
* @authentication: the authentication content
*
* Currently only supported type is PLAIN TEXT
*/
void populate_security_buffer(char *buffer, char *authentication)
{
char *auth = buffer + sizeof(u32) * 2;
u32 *sectype = (u32 *) buffer;
u32 *seclen = sectype + 1;
*sectype = strlen(authentication) > 0 ? 1 : 0;
*seclen = strlen(authentication);
/* plain text */
if (strlen(authentication) > 0)
memcpy(auth, authentication, *seclen);
}
/**
* map_wmi_error() - map errors from WMI methods to kernel error codes
* @error_code: integer error code returned from Dell's firmware
*/
int map_wmi_error(int error_code)
{
switch (error_code) {
case 0:
/* success */
return 0;
case 1:
/* failed */
return -EIO;
case 2:
/* invalid parameter */
return -EINVAL;
case 3:
/* access denied */
return -EACCES;
case 4:
/* not supported */
return -EOPNOTSUPP;
case 5:
/* memory error */
return -ENOMEM;
case 6:
/* protocol error */
return -EPROTO;
}
/* unspecified error */
return -EIO;
}
/**
* reset_bios_show() - sysfs implementaton for read reset_bios
* @kobj: Kernel object for this attribute
* @attr: Kernel object attribute
* @buf: The buffer to display to userspace
*/
static ssize_t reset_bios_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
char *start = buf;
int i;
for (i = 0; i < MAX_TYPES; i++) {
if (i == reset_option)
buf += sprintf(buf, "[%s] ", reset_types[i]);
else
buf += sprintf(buf, "%s ", reset_types[i]);
}
buf += sprintf(buf, "\n");
return buf-start;
}
/**
* reset_bios_store() - sysfs implementaton for write reset_bios
* @kobj: Kernel object for this attribute
* @attr: Kernel object attribute
* @buf: The buffer from userspace
* @count: the size of the buffer from userspace
*/
static ssize_t reset_bios_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
int type = sysfs_match_string(reset_types, buf);
int ret;
if (type < 0)
return type;
ret = set_bios_defaults(type);
pr_debug("reset all attributes request type %d: %d\n", type, ret);
if (!ret) {
reset_option = type;
ret = count;
}
return ret;
}
/**
* pending_reboot_show() - sysfs implementaton for read pending_reboot
* @kobj: Kernel object for this attribute
* @attr: Kernel object attribute
* @buf: The buffer to display to userspace
*
* Stores default value as 0
* When current_value is changed this attribute is set to 1 to notify reboot may be required
*/
static ssize_t pending_reboot_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", wmi_priv.pending_changes);
}
static struct kobj_attribute reset_bios = __ATTR_RW(reset_bios);
static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot);
/**
* create_attributes_level_sysfs_files() - Creates reset_bios and
* pending_reboot attributes
*/
static int create_attributes_level_sysfs_files(void)
{
int ret = sysfs_create_file(&wmi_priv.main_dir_kset->kobj, &reset_bios.attr);
if (ret) {
pr_debug("could not create reset_bios file\n");
return ret;
}
ret = sysfs_create_file(&wmi_priv.main_dir_kset->kobj, &pending_reboot.attr);
if (ret) {
pr_debug("could not create changing_pending_reboot file\n");
sysfs_remove_file(&wmi_priv.main_dir_kset->kobj, &reset_bios.attr);
}
return ret;
}
static void release_reset_bios_data(void)
{
sysfs_remove_file(&wmi_priv.main_dir_kset->kobj, &reset_bios.attr);
sysfs_remove_file(&wmi_priv.main_dir_kset->kobj, &pending_reboot.attr);
}
static ssize_t wmi_sysman_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct kobj_attribute *kattr;
ssize_t ret = -EIO;
kattr = container_of(attr, struct kobj_attribute, attr);
if (kattr->show)
ret = kattr->show(kobj, kattr, buf);
return ret;
}
static ssize_t wmi_sysman_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count)
{
struct kobj_attribute *kattr;
ssize_t ret = -EIO;
kattr = container_of(attr, struct kobj_attribute, attr);
if (kattr->store)
ret = kattr->store(kobj, kattr, buf, count);
return ret;
}
const struct sysfs_ops wmi_sysman_kobj_sysfs_ops = {
.show = wmi_sysman_attr_show,
.store = wmi_sysman_attr_store,
};
static void attr_name_release(struct kobject *kobj)
{
kfree(kobj);
}
static struct kobj_type attr_name_ktype = {
.release = attr_name_release,
.sysfs_ops = &wmi_sysman_kobj_sysfs_ops,
};
/**
* strlcpy_attr - Copy a length-limited, NULL-terminated string with bound checks
* @dest: Where to copy the string to
* @src: Where to copy the string from
*/
void strlcpy_attr(char *dest, char *src)
{
size_t len = strlen(src) + 1;
if (len > 1 && len <= MAX_BUFF)
strlcpy(dest, src, len);
/*len can be zero because any property not-applicable to attribute can
* be empty so check only for too long buffers and log error
*/
if (len > MAX_BUFF)
pr_err("Source string returned from BIOS is out of bound!\n");
}
/**
* get_wmiobj_pointer() - Get Content of WMI block for particular instance
* @instance_id: WMI instance ID
* @guid_string: WMI GUID (in str form)
*
* Fetches the content for WMI block (instance_id) under GUID (guid_string)
* Caller must kfree the return
*/
union acpi_object *get_wmiobj_pointer(int instance_id, const char *guid_string)
{
struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
status = wmi_query_block(guid_string, instance_id, &out);
return ACPI_SUCCESS(status) ? (union acpi_object *)out.pointer : NULL;
}
/**
* get_instance_count() - Compute total number of instances under guid_string
* @guid_string: WMI GUID (in string form)
*/
int get_instance_count(const char *guid_string)
{
union acpi_object *wmi_obj = NULL;
int i = 0;
do {
kfree(wmi_obj);
wmi_obj = get_wmiobj_pointer(i, guid_string);
i++;
} while (wmi_obj);
return (i-1);
}
/**
* alloc_attributes_data() - Allocate attributes data for a particular type
* @attr_type: Attribute type to allocate
*/
static int alloc_attributes_data(int attr_type)
{
int retval = 0;
switch (attr_type) {
case ENUM:
retval = alloc_enum_data();
break;
case INT:
retval = alloc_int_data();
break;
case STR:
retval = alloc_str_data();
break;
case PO:
retval = alloc_po_data();
break;
default:
break;
}
return retval;
}
/**
* destroy_attribute_objs() - Free a kset of kobjects
* @kset: The kset to destroy
*
* Fress kobjects created for each attribute_name under attribute type kset
*/
static void destroy_attribute_objs(struct kset *kset)
{
struct kobject *pos, *next;
list_for_each_entry_safe(pos, next, &kset->list, entry) {
kobject_put(pos);
}
}
/**
* release_attributes_data() - Clean-up all sysfs directories and files created
*/
static void release_attributes_data(void)
{
release_reset_bios_data();
mutex_lock(&wmi_priv.mutex);
exit_enum_attributes();
exit_int_attributes();
exit_str_attributes();
exit_po_attributes();
if (wmi_priv.authentication_dir_kset) {
destroy_attribute_objs(wmi_priv.authentication_dir_kset);
kset_unregister(wmi_priv.authentication_dir_kset);
wmi_priv.authentication_dir_kset = NULL;
}
if (wmi_priv.main_dir_kset) {
destroy_attribute_objs(wmi_priv.main_dir_kset);
kset_unregister(wmi_priv.main_dir_kset);
}
mutex_unlock(&wmi_priv.mutex);
}
/**
* init_bios_attributes() - Initialize all attributes for a type
* @attr_type: The attribute type to initialize
* @guid: The WMI GUID associated with this type to initialize
*
* Initialiaze all 4 types of attributes enumeration, integer, string and password object.
* Populates each attrbute typ's respective properties under sysfs files
*/
static int init_bios_attributes(int attr_type, const char *guid)
{
struct kobject *attr_name_kobj; //individual attribute names
union acpi_object *obj = NULL;
union acpi_object *elements;
struct kset *tmp_set;
/* instance_id needs to be reset for each type GUID
* also, instance IDs are unique within GUID but not across
*/
int instance_id = 0;
int retval = 0;
retval = alloc_attributes_data(attr_type);
if (retval)
return retval;
/* need to use specific instance_id and guid combination to get right data */
obj = get_wmiobj_pointer(instance_id, guid);
if (!obj)
return -ENODEV;
elements = obj->package.elements;
mutex_lock(&wmi_priv.mutex);
while (elements) {
/* sanity checking */
if (strlen(elements[ATTR_NAME].string.pointer) == 0) {
pr_debug("empty attribute found\n");
goto nextobj;
}
if (attr_type == PO)
tmp_set = wmi_priv.authentication_dir_kset;
else
tmp_set = wmi_priv.main_dir_kset;
if (kset_find_obj(tmp_set, elements[ATTR_NAME].string.pointer)) {
pr_debug("duplicate attribute name found - %s\n",
elements[ATTR_NAME].string.pointer);
goto nextobj;
}
/* build attribute */
attr_name_kobj = kzalloc(sizeof(*attr_name_kobj), GFP_KERNEL);
if (!attr_name_kobj)
goto err_attr_init;
attr_name_kobj->kset = tmp_set;
retval = kobject_init_and_add(attr_name_kobj, &attr_name_ktype, NULL, "%s",
elements[ATTR_NAME].string.pointer);
if (retval) {
kobject_put(attr_name_kobj);
goto err_attr_init;
}
/* enumerate all of this attribute */
switch (attr_type) {
case ENUM:
retval = populate_enum_data(elements, instance_id, attr_name_kobj);
break;
case INT:
retval = populate_int_data(elements, instance_id, attr_name_kobj);
break;
case STR:
retval = populate_str_data(elements, instance_id, attr_name_kobj);
break;
case PO:
retval = populate_po_data(elements, instance_id, attr_name_kobj);
break;
default:
break;
}
if (retval) {
pr_debug("failed to populate %s\n",
elements[ATTR_NAME].string.pointer);
goto err_attr_init;
}
nextobj:
kfree(obj);
instance_id++;
obj = get_wmiobj_pointer(instance_id, guid);
elements = obj ? obj->package.elements : NULL;
}
goto out;
err_attr_init:
release_attributes_data();
kfree(obj);
out:
mutex_unlock(&wmi_priv.mutex);
return retval;
}
static int __init sysman_init(void)
{
int ret = 0;
if (!dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL) &&
!dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "www.dell.com", NULL)) {
pr_err("Unable to run on non-Dell system\n");
return -ENODEV;
}
ret = init_bios_attr_set_interface();
if (ret || !wmi_priv.bios_attr_wdev) {
pr_debug("failed to initialize set interface\n");
goto fail_set_interface;
}
ret = init_bios_attr_pass_interface();
if (ret || !wmi_priv.password_attr_wdev) {
pr_debug("failed to initialize pass interface\n");
goto fail_pass_interface;
}
ret = class_register(&firmware_attributes_class);
if (ret)
goto fail_class;
wmi_priv.class_dev = device_create(&firmware_attributes_class, NULL, MKDEV(0, 0),
NULL, "%s", DRIVER_NAME);
if (IS_ERR(wmi_priv.class_dev)) {
ret = PTR_ERR(wmi_priv.class_dev);
goto fail_classdev;
}
wmi_priv.main_dir_kset = kset_create_and_add("attributes", NULL,
&wmi_priv.class_dev->kobj);
if (!wmi_priv.main_dir_kset) {
ret = -ENOMEM;
goto fail_main_kset;
}
wmi_priv.authentication_dir_kset = kset_create_and_add("authentication", NULL,
&wmi_priv.class_dev->kobj);
if (!wmi_priv.authentication_dir_kset) {
ret = -ENOMEM;
goto fail_authentication_kset;
}
ret = create_attributes_level_sysfs_files();
if (ret) {
pr_debug("could not create reset BIOS attribute\n");
goto fail_reset_bios;
}
ret = init_bios_attributes(ENUM, DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
if (ret) {
pr_debug("failed to populate enumeration type attributes\n");
goto fail_create_group;
}
ret = init_bios_attributes(INT, DELL_WMI_BIOS_INTEGER_ATTRIBUTE_GUID);
if (ret) {
pr_debug("failed to populate integer type attributes\n");
goto fail_create_group;
}
ret = init_bios_attributes(STR, DELL_WMI_BIOS_STRING_ATTRIBUTE_GUID);
if (ret) {
pr_debug("failed to populate string type attributes\n");
goto fail_create_group;
}
ret = init_bios_attributes(PO, DELL_WMI_BIOS_PASSOBJ_ATTRIBUTE_GUID);
if (ret) {
pr_debug("failed to populate pass object type attributes\n");
goto fail_create_group;
}
return 0;
fail_create_group:
release_attributes_data();
fail_reset_bios:
if (wmi_priv.authentication_dir_kset) {
kset_unregister(wmi_priv.authentication_dir_kset);
wmi_priv.authentication_dir_kset = NULL;
}
fail_authentication_kset:
if (wmi_priv.main_dir_kset) {
kset_unregister(wmi_priv.main_dir_kset);
wmi_priv.main_dir_kset = NULL;
}
fail_main_kset:
device_destroy(&firmware_attributes_class, MKDEV(0, 0));
fail_classdev:
class_unregister(&firmware_attributes_class);
fail_class:
exit_bios_attr_pass_interface();
fail_pass_interface:
exit_bios_attr_set_interface();
fail_set_interface:
return ret;
}
static void __exit sysman_exit(void)
{
release_attributes_data();
device_destroy(&firmware_attributes_class, MKDEV(0, 0));
class_unregister(&firmware_attributes_class);
exit_bios_attr_set_interface();
exit_bios_attr_pass_interface();
}
module_init(sysman_init);
module_exit(sysman_exit);
MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>");
MODULE_AUTHOR("Prasanth Ksr <prasanth.ksr@dell.com>");
MODULE_AUTHOR("Divya Bharathi <divya.bharathi@dell.com>");
MODULE_DESCRIPTION("Dell platform setting control interface");
MODULE_LICENSE("GPL");