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| author | Maximilian Luz <luzmaximilian@gmail.com> | 2021-04-06 01:41:25 +0200 |
|---|---|---|
| committer | Sebastian Reichel <sebastian.reichel@collabora.com> | 2021-04-08 14:30:28 +0200 |
| commit | 167f77f7d0b3891941866ae66f9cf4362ec33f93 (patch) | |
| tree | 1528eeea3c7d6d511eb2e701036d5b17ea21dbcd /Documentation/ABI | |
| parent | b6dc03fafe63e0e76c094e4303e6d43bc29a06d7 (diff) | |
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>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-power-surface | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-power-surface b/Documentation/ABI/testing/sysfs-class-power-surface new file mode 100644 index 000000000000..79cde4dcf2f5 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-power-surface @@ -0,0 +1,15 @@ +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 |