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authorLance Ortiz <lance.ortiz@hp.com>2012-10-02 12:43:23 -0600
committerLen Brown <len.brown@intel.com>2012-10-06 15:52:16 -0400
commitd1efe3c324ead77d3f6cd85093b50f6bd2e17aba (patch)
tree7c85ab68cc0d906c0479e816d955481723e945b1 /README
parent369d913b242cae2205471b11b6e33ac368ed33ec (diff)
downloadlinux-stericsson-d1efe3c324ead77d3f6cd85093b50f6bd2e17aba.tar.gz
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>
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