linux-kernel - Re: [PATCH] platform/x86:dell-laptop:Add battery charging thresholds and charging mode switch.

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Date:   Wed, 29 Jul 2020 08:27:56 +0100
From:   Matthew Garrett <mjg59@...f.ucam.org>
To:     Perry Yuan <Perry.Yuan@...l.com>
Cc:     sre@...nel.org, pali@...nel.org, dvhart@...radead.org,
        andy@...radead.org, mario.limonciello@...l.com,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] platform/x86:dell-laptop:Add battery charging thresholds
 and charging mode switch.

On Tue, Jul 28, 2020 at 11:54:24PM -0700, Perry Yuan wrote:

This seems extremely useful, but:

> diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
> index bf3b48f022dc..a8adc3b0ca4b 100644
> --- a/Documentation/ABI/testing/sysfs-class-power
> +++ b/Documentation/ABI/testing/sysfs-class-power
> @@ -334,6 +334,29 @@ Description:
>  		Access: Read
>  		Valid values: Represented in microvolts
>  
> +What:		/sys/class/power_supply/<supply_name>/charge_control_charging_mode
> +Date:		March 2020
> +Contact:	linux-pm@...r.kernel.org

The values here seem very Dell specific, but this is going into a 
generic sysfs path. Really stuff here should be as vendor independent as 
possible. If these values don't correspond to a wider industry 
specification it probably makes sense to make this something Dell 
specific.

-- 
Matthew Garrett | mjg59@...f.ucam.org