xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ACPI / PM: Expose current status of ACPI power resources

Browse Source 
Since ACPI power resources are going to be used more extensively on
new hardware platforms, it becomes necessary for user space (powertop
in particular) to observe some properties of those resources for
diagnostics purposes.

For this reason, expose the current status of each ACPI power
resource to user space via sysfs by adding a new resource_in_use
attribute to the sysfs directory representing the given power
resource.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki
2013-01-24 12:50:09 +01:00
parent 836aedb141
commit b1c0f99bfb
4 changed files with 41 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/ABI/testing/sysfs-devices-resource_in_use Normal file
View File

@@ -0,0 +1,12 @@
What: /sys/devices/.../resource_in_use
Date: January 2013
Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Description:
The /sys/devices/.../resource_in_use attribute is only present
for device objects representing ACPI power resources.
If present, it contains a number (0 or 1) representing the
current status of the given power resource (0 means that the
resource is not in use and therefore it has been turned off).
This attribute is read-only.