lkml.org 
[lkml]   [2021]   [Nov]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 0/4] power: supply: add charge_behaviour property (force-discharge, inhibit-charge)
From
Date
Hi Thomas,

thank you very much for working on this. It is high time that we leave
external kernel modules for ThinkPads behind us.

On 13.11.21 11:42, Thomas Weißschuh wrote:
> Hi,
>
> this series adds support for the charge_behaviour property to the power
> subsystem and thinkpad_acpi driver.
>
> As thinkpad_acpi has to use the 'struct power_supply' created by the generic
> ACPI driver it has to rely on custom sysfs attributes instead of proper
> power_supply properties to implement this property.
>
> Patch 1: Adds the power_supply documentation and basic public API
> Patch 2: Adds helpers to power_supply core to help drivers implement the
> charge_behaviour attribute
> Patch 3: Adds support for force-discharge to thinkpad_acpi.
> Patch 4: Adds support for inhibit-discharge to thinkpad_acpi.
>
> Patch 3 and 4 are largely taken from other patches and adapted to the new API.
> (Links are in the patch trailer)
>
> Ognjen Galic, Nicolo' Piazzalunga, Thomas Koch:
>
> Your S-o-b is on the original inhibit_charge and force_discharge patches.
> I would like to add you as Co-developed-by but to do that it will also require
> your S-o-b. Could you give your sign-offs for the new patches, so you can be
> properly attributed?
S-o-b/Co-developed-by/Tested-by is fine with me.

I tested your patches.

Hardware:

- ThinkPad X220, BAT0
- ThinkPad T450s, BAT0+BAT1
- ThinkPad X1C6, BAT0

Test Results:

1. force-discharge

Everythings works as expected
- Writing including disengaging w/ "auto" : OK
- Reading: OK

- Battery discharging: OK
- Disengaging with "auto": OK

2. inhibit-charge

Works as expected:
- Writing: OK

- Disengaging with "auto": OK


Discrepancies:
- Battery charge inhibited: BAT0 OK, BAT1 no effect e.g. continues charging
- Reading: always returns "auto"

Note: the reading discrepancy may be related to Hans' remarks [1].

[1]
https://lore.kernel.org/all/09a66da1-1a8b-a668-3179-81670303ea37@redhat.com/

>
> Sebastian Reichel:
>
> Currently the series does not actually support the property as a proper
> powersupply property handled fully by power_supply_sysfs.c because there would
> be no user for this property.
>
> Previous discussions about the API:
>
> https://lore.kernel.org/platform-driver-x86/20211108192852.357473-1-linux@weissschuh.net/
> https://lore.kernel.org/platform-driver-x86/21569a89-8303-8573-05fb-c2fec29983d1@gmail.com/
>
> Thomas Weißschuh (4):
> power: supply: add charge_behaviour attributes
> power: supply: add helpers for charge_behaviour sysfs
> platform/x86: thinkpad_acpi: support force-discharge
> platform/x86: thinkpad_acpi: support inhibit-charge
>
> Documentation/ABI/testing/sysfs-class-power | 14 ++
> drivers/platform/x86/thinkpad_acpi.c | 154 +++++++++++++++++++-
> drivers/power/supply/power_supply_sysfs.c | 51 +++++++
> include/linux/power_supply.h | 16 ++
> 4 files changed, 231 insertions(+), 4 deletions(-)
>
>
> base-commit: 66f4beaa6c1d28161f534471484b2daa2de1dce0
>
--
Freundliche Grüße / Kind regards,
Thomas Koch

Mail : linrunner@gmx.net
Web : https://linrunner.de/tlp

\
 
 \ /
  Last update: 2021-11-16 17:58    [W:0.121 / U:1.492 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site