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linux-stable/Documentation/ABI/testing/sysfs-class-power-surface

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power: supply: Add battery driver for Surface Aggregator Module On newer Microsoft Surface models (specifically 7th-generation, i.e. Surface Pro 7, Surface Book 3, Surface Laptop 3, and Surface Laptop Go), battery and AC status/information is no longer handled via standard ACPI devices, but instead directly via the Surface System Aggregator Module (SSAM), i.e. the embedded controller on those devices. While on previous generation models, battery status is also handled via SSAM, an ACPI shim was present to translate the standard ACPI battery interface to SSAM requests. The SSAM interface itself, which is modeled closely after the ACPI interface, has not changed. This commit introduces a new SSAM client device driver to support battery status/information via the aforementioned interface on said Surface models. It is in parts based on the standard ACPI battery driver. Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2021-04-05 23:41:25 +00:00
What: /sys/class/power_supply/<supply_name>/alarm
Date: April 2021
KernelVersion: 5.13
Contact: Maximilian Luz <luzmaximilian@gmail.com>
Description:
Battery trip point. When the remaining battery capacity crosses this
value in either direction, the system will be notified and if
necessary woken.
Set to zero to clear/disable.
Access: Read, Write
Valid values: In micro-Wh or micro-Ah, depending on the power unit
of the battery
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