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Commit 5b09081f authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab Committed by Hans de Goede
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docs: ABI: sysfs-class-firmware-attributes: solve some warnings 

The Description: tag is missing on some places, causing
scripts/get_abi.pl warnings:

	Warning: file Documentation/ABI/testing/sysfs-class-firmware-attributes#172:
		What '/sys/class/firmware-attributes/*/authentication/' doesn't have a description

Also, some warnings are produced when generating html documentation:

	.../Documentation/ABI/testing/sysfs-class-firmware-attributes:2: WARNING: Title underline too short.

	Dell specific class extensions
	--------------------------
	.../Documentation/ABI/testing/sysfs-class-firmware-attributes:2: WARNING: Unexpected indentation.
	.../Documentation/ABI/testing/sysfs-class-firmware-attributes:2: WARNING: Unexpected indentation.
	.../Documentation/ABI/testing/sysfs-class-firmware-attributes:2: WARNING: Block quote ends without a blank line; unexpected unindent.
	.../Documentation/ABI/testing/sysfs-class-firmware-attributes:173: WARNING: Unexpected indentation.
	.../Documentation/ABI/testing/sysfs-class-firmware-attributes:173: WARNING: Unexpected indentation.
	.../Documentation/ABI/testing/sysfs-class-firmware-attributes:173: WARNING: Block quote ends without a blank line; unexpected unindent.
	.../Documentation/ABI/testing/sysfs-class-firmware-attributes:111: WARNING: Inline emphasis start-string without end-string.

Address the warnings, making it to produce the expected
output for the documentation ABI.
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/44b4181b4f772fcc5ec676e72b295c10df35121b.1603963862.git.mchehab+huawei@kernel.orgSigned-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 5c54cb6c
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Showing with 87 additions and 53 deletions
Documentation/ABI/testing/sysfs-class-firmware-attributes
View file @ 5b09081f
......@@ -12,17 +12,20 @@ Description:
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.
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
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
......@@ -30,59 +33,71 @@ Description:
This attribute is mandatory.
default_value: A file that can be read to obtain the default
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
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
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
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
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
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
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
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
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
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>]
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]
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
......@@ -90,18 +105,22 @@ Description:
Enumeration attributes also support the following:
dell_value_modifier: A file that can be read to obtain value-level dependency.
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>]
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]
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
......@@ -113,12 +132,13 @@ KernelVersion: 5.11
Contact: Divya Bharathi <Divya.Bharathi@Dell.com>,
Mario Limonciello <mario.limonciello@dell.com>,
Prasanth KSR <prasanth.ksr@dell.com>
Description:
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.
......@@ -126,39 +146,50 @@ Contact: Divya Bharathi <Divya.Bharathi@Dell.com>,
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
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.
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.
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
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
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
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
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:
For example::
echo "password" > current_password
echo "disabled" > TouchScreen/current_value
echo "" > current_password
......@@ -180,12 +211,15 @@ Description:
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
== =========================================
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
......@@ -208,17 +242,17 @@ Description:
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)
- '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:
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
# 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.
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