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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>
18 lines
686 B
Plaintext
18 lines
686 B
Plaintext
What: /sys/devices/.../firmware_node/
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Date: September 2012
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Contact: <>
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Description:
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The /sys/devices/.../firmware_node directory contains attributes
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allowing the user space to check and modify some firmware
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related properties of given device.
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What: /sys/devices/.../firmware_node/description
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Date: September 2012
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Contact: Lance Ortiz <lance.ortiz@hp.com>
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Description:
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The /sys/devices/.../firmware/description attribute contains a string
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that describes the device as provided by the _STR method in the ACPI
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namespace. This attribute is read-only. If the device does not have
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an _STR method associated with it in the ACPI namespace, this
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attribute is not present.
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