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