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Since ACPI power resources are going to be used more extensively on new hardware platforms, it is necessary to allow user space (powertop in particular) to look at the lists of power resources corresponding to different power states of devices for diagnostics and control purposes. For this reason, for each power state of an ACPI device node using power resources create a special attribute group under the device node's directory in sysfs containing links to sysfs directories representing the power resources in that list. The names of the new attribute groups are "power_resources_<state>", where <state> is the state name i.e. "D0", "D1", "D2", or "D3hot". Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
14 lines
614 B
Text
14 lines
614 B
Text
What: /sys/devices/.../power_resources_D2/
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Date: January 2013
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Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Description:
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The /sys/devices/.../power_resources_D2/ directory is only
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present for device objects representing ACPI device nodes that
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use ACPI power resources for power management and support ACPI
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power state D2.
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If present, it contains symbolic links to device directories
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representing ACPI power resources that need to be turned on for
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the given device node to be in ACPI power state D2. The names
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of the links are the same as the names of the directories they
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point to.
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