Re: [PATCH] ACPI: battery: add state_of_health support to power_supply

[Sebastian Reichel <sre@kernel.org>]

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Hi,

On Thu, Apr 23, 2026 at 03:58:53PM +0800, luoxueqin wrote:
> From: Xueqin Luo <luoxueqin@kylinos.cn>
> 
> Add support for POWER_SUPPLY_PROP_STATE_OF_HEALTH in ACPI battery
> driver.
> 
> State of Health is calculated as the ratio between full charge capacity
> and design capacity, expressed as a percentage.
> 
> The value is computed as:
>     SOH = full_charge_capacity * 100 / design_capacity

$ grep -A15 state_of_health Documentation/ABI/testing/sysfs-class-power
What:		/sys/class/power_supply/<supply_name>/state_of_health
Date:		August 2025
Contact:	linux-arm-msm@vger.kernel.org
Description:
		The state_of_health parameter quantifies the overall condition
		of a battery as a percentage, reflecting its ability to deliver
		rated performance relative to its original specifications. It is
		dynamically computed using a combination of learned capacity
		and impedance-based degradation indicators, both of which evolve
		over the battery's lifecycle.
		Note that the exact algorithms are kept secret by most battery
		vendors and the value from different battery vendors cannot be
		compared with each other as there is no vendor-agnostic definition
		of "performance". Also this usually cannot be used for any
		calculations (i.e. this is not the factor between charge_full and
		charge_full_design).

		Access: Read

		Valid values: 0 - 100 (percent)

Greetings,

-- Sebastian

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