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OpenCloudOS-Kernel/Documentation/ABI/testing/sysfs-devices-firmware_node

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ACPI: Add new sysfs interface to export device description Add support to export the device description obtained from the ACPI _STR method, if one exists for a device, to user-space via a sysfs interface. This new interface provides a standard and platform neutral way for users to obtain the description text stored in the ACPI _STR method. If no _STR method exists for the device, no sysfs 'description' file will be created. 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/description Example: /sys/devices/pci0000:00/0000:00.07.0/0000:0e:00.0/firmware_node/description It 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/description Execute the 'cat' command on the 'description' file to obtain the description string for that device. This patch also includes documentation describing how the new sysfs interface works Changes 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 of dev->pnp.str_obj before calling free. This check triggered a message from smatch. Signed-off-by: Lance Ortiz <lance.ortiz@hp.com> Signed-off-by: Len Brown <len.brown@intel.com>
2012-10-03 02:43:23 +08:00
What: /sys/devices/.../firmware_node/
Date: September 2012
Contact: <>
Description:
The /sys/devices/.../firmware_node directory contains attributes
allowing the user space to check and modify some firmware
related properties of given device.
What: /sys/devices/.../firmware_node/description
Date: September 2012
Contact: Lance Ortiz <lance.ortiz@hp.com>
Description:
The /sys/devices/.../firmware/description attribute contains a string
that describes the device as provided by the _STR method in the ACPI
namespace. This attribute is read-only. If the device does not have
an _STR method associated with it in the ACPI namespace, this
attribute is not present.