linux-kernel - Re: [PATCH v3 1/4] platform/x86: (ayn-ec) Add PWM Fan HWMON Interface

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Message-ID: <CAFqHKTnO2NQ+_q_FOwT74Ukg7tx2k3B_sksEhNBzuCeZEWe3FQ@mail.gmail.com>
Date: Sun, 10 Aug 2025 15:27:36 -0700
From: Derek John Clark <derekjohn.clark@...il.com>
To: Armin Wolf <W_Armin@....de>
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	Hans de Goede <hansg@...nel.org>, Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>, 
	Alok Tiwari <alok.a.tiwari@...cle.com>, David Box <david.e.box@...ux.intel.com>, 
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 1/4] platform/x86: (ayn-ec) Add PWM Fan HWMON Interface

On Mon, Jul 28, 2025 at 9:10 PM Armin Wolf <W_Armin@....de> wrote:
>
> Am 29.07.25 um 04:58 schrieb Derek John Clark:
>
> > On Sat, Jul 26, 2025 at 4:32 PM Armin Wolf <W_Armin@....de> wrote:
> >> Am 26.07.25 um 22:40 schrieb Derek J. Clark:
> >>
> >>> Adds platform driver for AYN Loki and Tectoy Zeenix lines of handheld
> >>> devices. This patch implements a hwmon interface for EC provided manual
> >>> PWM fan control and user defined fan curves. A global ACPI lock is used
> >>> when reading or writing from the EC.
> >>>
> >>> There are 4 fan modes implemented in this patch. Modes 0-3 act in
> >>> accordance with the standard hwmon logic where 0 is 100% fan speed, 1 is
> >>> manual control, and 2 is automatic control. As the EC only provides 3
> >>> modes by default, mode 0 is implemented by setting the device to manual
> >>> and then setting fan speed to 100% directly. In mode 1 the PWM duty cycle
> >>> is set in sysfs with values [0-255], which are then scaled to the EC max
> >>> of 128. Mode 4 is an automatic mode where the fan curve is user defined.
> >>> There are 5 total set points and each set point takes a temperature in
> >>> Celsius [0-100] and a PWM duty cycle [0-255]. When the CPU temperature
> >>> reaches a given set point, the corresponding duty cycle is automatically
> >>> set by the EC.
> >>>
> >>> Signed-off-by: Derek J. Clark <derekjohn.clark@...il.com>
> >>>
> >>> space
> >> Interesting, do you have access to such a device? If yes then i would be very interested
> >> in looking at the ACPI tables shipped with said device.
> > Hi Armin,
> >
> > I have a Loki Max, and know someone with a Loki Zero. Do you want
> > plain text acpidump or a decoded DSDT.dat attached?
>
> I would prefer the plain text acpidump, as the SSDT tables often contain important data.
>

Attached is the plain text acpidump, sorry for the delay. I'll also
note that Ayn provided me with documentation of the EC commands for
this driver.

Cheers,
- Derek

View attachment "ayn_loki_acpi_dump.txt" of type "text/plain" (1184965 bytes)