From 836aedb1414d4724b2ec68dd19810960c593720c Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 24 Jan 2013 12:49:59 +0100 Subject: ACPI / PM: Expose power states of ACPI devices to user space Make it possible to retrieve the current power state of a device with ACPI power management from user space via sysfs by adding two new attributes, power_state and real_power_state, to the sysfs directory associated with the struct acpi_device object representing the device's ACPI node. Signed-off-by: Rafael J. Wysocki Acked-by: Greg Kroah-Hartman --- .../ABI/testing/sysfs-devices-power_state | 20 +++++++++++++++++++ .../ABI/testing/sysfs-devices-real_power_state | 23 ++++++++++++++++++++++ 2 files changed, 43 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-devices-power_state create mode 100644 Documentation/ABI/testing/sysfs-devices-real_power_state (limited to 'Documentation/ABI') diff --git a/Documentation/ABI/testing/sysfs-devices-power_state b/Documentation/ABI/testing/sysfs-devices-power_state new file mode 100644 index 000000000000..7ad9546748f0 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-power_state @@ -0,0 +1,20 @@ +What: /sys/devices/.../power_state +Date: January 2013 +Contact: Rafael J. Wysocki +Description: + The /sys/devices/.../power_state attribute is only present for + device objects representing ACPI device nodes that provide power + management methods. + + If present, it contains a string representing the current ACPI + power state of the given device node. Its possible values, + "D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state + names defined by the ACPI specification (ACPI 4 and above). + + If the device node uses shared ACPI power resources, this state + determines a list of power resources required not to be turned + off. However, some power resources needed by the device node in + higher-power (lower-number) states may also be ON because of + some other devices using them at the moment. + + This attribute is read-only. diff --git a/Documentation/ABI/testing/sysfs-devices-real_power_state b/Documentation/ABI/testing/sysfs-devices-real_power_state new file mode 100644 index 000000000000..8b3527c82a7d --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-real_power_state @@ -0,0 +1,23 @@ +What: /sys/devices/.../real_power_state +Date: January 2013 +Contact: Rafael J. Wysocki +Description: + The /sys/devices/.../real_power_state attribute is only present + for device objects representing ACPI device nodes that provide + power management methods and use ACPI power resources for power + management. + + If present, it contains a string representing the real ACPI + power state of the given device node as returned by the _PSC + control method or inferred from the configuration of power + resources. Its possible values, "D0", "D1", "D2", "D3hot", and + "D3cold", reflect the power state names defined by the ACPI + specification (ACPI 4 and above). + + In some situations the value of this attribute may be different + from the value of the /sys/devices/.../power_state attribute for + the same device object. If that happens, some shared power + resources used by the device node are only ON because of some + other devices using them at the moment. + + This attribute is read-only. -- cgit v1.2.1