diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/configfs-acpi | 29 | ||||
| -rw-r--r-- | Documentation/acpi/ssdt-overlays.txt | 14 |
2 files changed, 43 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/configfs-acpi b/Documentation/ABI/testing/configfs-acpi index 17b19dc2822d..4ab4e99aa863 100644 --- a/Documentation/ABI/testing/configfs-acpi +++ b/Documentation/ABI/testing/configfs-acpi @@ -5,3 +5,32 @@ Contact: linux-acpi@vger.kernel.org Description: This represents the ACPI subsystem entry point directory. It contains sub-groups corresponding to ACPI configurable options. + +What: /config/acpi/table +Date: July 2016 +KernelVersion: 4.8 +Description: + + This group contains the configuration for user defined ACPI + tables. The attributes of a user define table are: + + aml - a binary attribute that the user can use to + fill in the ACPI aml definitions. Once the aml + data is written to this file and the file is + closed the table will be loaded and ACPI devices + will be enumerated. To check if the operation is + successful the user must check the error code + for close(). If the operation is successful, + subsequent writes to this attribute will fail. + + The rest of the attributes are read-only and are valid only + after the table has been loaded by filling the aml entry: + + signature - ASCII table signature + length - length of table in bytes, including the header + revision - ACPI Specification minor version number + oem_id - ASCII OEM identification + oem_table_id - ASCII OEM table identification + oem_revision - OEM revision number + asl_compiler_id - ASCII ASL compiler vendor ID + asl_compiler_revision - ASL compiler version diff --git a/Documentation/acpi/ssdt-overlays.txt b/Documentation/acpi/ssdt-overlays.txt index c4b57badd0b7..5ae13f161ea2 100644 --- a/Documentation/acpi/ssdt-overlays.txt +++ b/Documentation/acpi/ssdt-overlays.txt @@ -156,3 +156,17 @@ tmp=$(mktemp) /bin/echo -ne "\007\000\000\000" | cat - $filename > $tmp dd if=$tmp of="$EFIVARFS/$name-$guid" bs=$(stat -c %s $tmp) rm $tmp + +== Loading ACPI SSDTs from configfs == + +This option allows loading of user defined SSDTs from userspace via the configfs +interface. The CONFIG_ACPI_CONFIGFS option must be select and configfs must be +mounted. In the following examples, we assume that configfs has been mounted in +/config. + +New tables can be loading by creating new directories in /config/acpi/table/ and +writing the SSDT aml code in the aml attribute: + +cd /config/acpi/table +mkdir my_ssdt +cat ~/ssdt.aml > my_ssdt/aml |