118 lines
4.1 KiB
Plaintext
118 lines
4.1 KiB
Plaintext
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ACPI Time and Alarm (TAD) device attributes.
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What: /sys/bus/platform/devices/ACPI000E:00/caps
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Date: March 2018
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Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Description:
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(RO) Hexadecimal bitmask of the TAD attributes are reported by
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the platform firmware (see ACPI 6.2, section 9.18.2):
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======= ======================================================
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BIT(0): AC wakeup implemented if set
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BIT(1): DC wakeup implemented if set
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BIT(2): Get/set real time features implemented if set
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BIT(3): Real time accuracy in milliseconds if set
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BIT(4): Correct status reported for wakeups from S4/S5 if set
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BIT(5): The AC timer wakes up from S4 if set
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BIT(6): The AC timer wakes up from S5 if set
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BIT(7): The DC timer wakes up from S4 if set
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BIT(8): The DC timer wakes up from S5 if set
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======= ======================================================
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The other bits are reserved.
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What: /sys/bus/platform/devices/ACPI000E:00/ac_alarm
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Date: March 2018
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Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Description:
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(RW) The AC alarm timer value.
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Reads return the current AC alarm timer value in seconds or
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"disabled", if the AC alarm is not set to wake up the system.
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Write a new AC alarm timer value in seconds or "disabled" to it
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to set the AC alarm timer or to disable it, respectively.
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If the AC alarm timer is set through this attribute and it
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expires, it will immediately wake up the system from the S3
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sleep state (and from S4/S5 too if supported) until its status
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is explicitly cleared via the ac_status attribute.
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What: /sys/bus/platform/devices/ACPI000E:00/ac_policy
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Date: March 2018
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Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Description:
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(RW) The AC alarm expired timer wake policy (see ACPI 6.2,
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Section 9.18 for details).
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Reads return the current expired timer wake delay for the AC
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alarm timer or "never", if the policy is to discard AC timer
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wakeups if the system is on DC power.
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Write a new expired timer wake delay for the AC alarm timer in
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seconds or "never" to it to set the expired timer wake delay for
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the AC alarm timer or to set its expired wake policy to discard
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wakeups if the system is on DC power, respectively.
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What: /sys/bus/platform/devices/ACPI000E:00/ac_status
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Date: March 2018
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Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Description:
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(RW) The AC alarm status.
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Reads return a hexadecimal bitmask representing the AC alarm
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timer status with the following meaning of bits (see ACPI 6.2,
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Section 9.18.5):
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======= ======================================================
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Bit(0): The timer has expired if set.
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Bit(1): The timer has woken up the system from a sleep state
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(S3 or S4/S5 if supported) if set.
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======= ======================================================
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The other bits are reserved.
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Reads also cause the AC alarm timer status to be reset.
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Another way to reset the status of the AC alarm timer is to
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write (the number) 0 to this file.
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If the status return value indicates that the timer has expired,
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it will immediately wake up the system from the S3 sleep state
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(and from S4/S5 too if supported) until its status is explicitly
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cleared through this attribute.
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What: /sys/bus/platform/devices/ACPI000E:00/dc_alarm
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Date: March 2018
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Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Description:
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(RW,optional) The DC alarm timer value.
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This attribute is only present if the TAD supports a separate
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DC timer.
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It is analogous to the ac_alarm attribute.
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What: /sys/bus/platform/devices/ACPI000E:00/dc_policy
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Date: March 2018
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Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Description:
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(RW,optional) The DC alarm expired timer wake policy.
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This attribute is only present if the TAD supports a separate
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DC timer.
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It is analogous to the ac_policy attribute.
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What: /sys/bus/platform/devices/ACPI000E:00/dc_status
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Date: March 2018
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Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Description:
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(RW,optional) The DC alarm status.
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This attribute is only present if the TAD supports a separate
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DC timer.
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It is analogous to the ac_status attribute.
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