en Copyright 2015 Java http://172.16.0.5:8080/history/linux-6.15/Documentation/ABI/testing/sysfs-devices-firmware_node#d1efe3c3 ACPI: Add new sysfs interface to export device descriptionAdd support to export the device description obtained from the ACPI _STRmethod, if one exists for a device, to user-space via a sysfs interface.This new interface provides a standard and platform neutral way for usersto obtain the description text stored in the ACPI _STR method. If no_STR method exists for the device, no sysfs 'description' file will becreated. The 'description' file will be located in the /sys/devices/directory using the device's path./sys/device/<bus>/<bridge path>/<device path>.../firmware_node/descriptionExample:/sys/devices/pci0000:00/0000:00.07.0/0000:0e:00.0/firmware_node/descriptionIt can also be located using the ACPI device path, for example:/sys/devices/LNXSYSTM:00/device:00/ACPI0004:00/PNP0A08:00/device:13/device:15/description/sys/devices/LNXSYSTM:00/device:00/ACPI0004:00/ACPI0004:01/ACPI0007:02/descriptionExecute the 'cat' command on the 'description' file to obtain thedescription string for that device.This patch also includes documentation describing how the new sysfsinterface worksChanges from v1-v2 based on comments by Len Brown and Fengguang Wu* Removed output "No Description" and leaving a NULL attribute if the_STR method failed to evaluate.* In acpi_device_remove_files() removed the redundent check ofdev->pnp.str_obj before calling free. This check triggered a messagefrom smatch.Signed-off-by: Lance Ortiz <lance.ortiz@hp.com>Signed-off-by: Len Brown <len.brown@intel.com> List of files: /linux-6.15/Documentation/ABI/testing/sysfs-devices-firmware_node Tue, 02 Oct 2012 18:43:23 +0000 Lance Ortiz <lance.ortiz@hp.com>