linux-kernel - Re: [PATCH v2] hwmon: Add thermal sensor driver for Surface Aggregator Module

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Message-ID: <44aa4b41-c9af-4c0a-a8a8-4d2cd3e1054e@kernel.org>
Date: Mon, 19 Aug 2024 12:26:34 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Maximilian Luz <luzmaximilian@...il.com>,
 Konrad Dybcio <konradybcio@...nel.org>, Guenter Roeck <linux@...ck-us.net>
Cc: Jean Delvare <jdelvare@...e.com>, Hans de Goede <hdegoede@...hat.com>,
 Ivor Wanders <ivor@...nders.net>, linux-kernel@...r.kernel.org,
 linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v2] hwmon: Add thermal sensor driver for Surface
 Aggregator Module

On 10.08.2024 3:14 AM, Konrad Dybcio wrote:
> On 10.08.2024 3:04 AM, Maximilian Luz wrote:
>> On 8/10/24 1:35 AM, Konrad Dybcio wrote:
>>> On 5.08.2024 1:08 AM, Maximilian Luz wrote:
>>>> Some of the newer Microsoft Surface devices (such as the Surface Book
>>>> 3 and Pro 9) have thermal sensors connected via the Surface Aggregator
>>>> Module (the embedded controller on those devices). Add a basic driver
>>>> to read out the temperature values of those sensors.
>>>>
>>>> The EC can have up to 16 thermal sensors connected via a single
>>>> sub-device, each providing temperature readings and a label string.
>>>>
>>>> Link: https://github.com/linux-surface/surface-aggregator-module/issues/59
>>>> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
>>>> Co-developed-by: Ivor Wanders <ivor@...nders.net>
>>>> Signed-off-by: Ivor Wanders <ivor@...nders.net>
>>>> Signed-off-by: Maximilian Luz <luzmaximilian@...il.com>
>>>>
>>>> ---
>>>
>>> Gave it a shot on SL7, some names are repeated and one sensor is
>>> totally busted
>>>
>>> /sys/class/hwmon/hwmon66/name:surface_thermal
>>> /sys/class/hwmon/hwmon66/temp10_input:32200
>>> /sys/class/hwmon/hwmon66/temp10_label:I_RTS2
>>> /sys/class/hwmon/hwmon66/temp11_input:31600
>>> /sys/class/hwmon/hwmon66/temp11_label:I_RTS3
>>> /sys/class/hwmon/hwmon66/temp12_input:38000
>>> /sys/class/hwmon/hwmon66/temp12_label:I_RTS4
>>> /sys/class/hwmon/hwmon66/temp1_input:43900
>>> /sys/class/hwmon/hwmon66/temp1_label:I_RTS1
>>> /sys/class/hwmon/hwmon66/temp2_input:44000
>>> /sys/class/hwmon/hwmon66/temp2_label:I_RTS2
>>> /sys/class/hwmon/hwmon66/temp3_input:47300
>>> /sys/class/hwmon/hwmon66/temp3_label:I_RTS3
>>> /sys/class/hwmon/hwmon66/temp4_input:-273100
>>> /sys/class/hwmon/hwmon66/temp4_label:I_RTS4
>>> /sys/class/hwmon/hwmon66/temp5_input:31300
>>> /sys/class/hwmon/hwmon66/temp5_label:I_RTS5
>>> /sys/class/hwmon/hwmon66/temp9_input:37100
>>> /sys/class/hwmon/hwmon66/temp9_label:I_RTS1
>>
>> Hmm, on the SPX it looks like this:
>>
>> I_RTS1:       +31.9°C
>> I_RTS2:       +31.3°C
>> I_RTS3:       +31.4°C
>> I_RTS4:       +28.3°C
>> I_RTS5:       +29.3°C
>> I_RTS6:       +29.3°C
>> I_RTS7:       +29.3°C
>> I_RTS8:       +29.3°C
>> VTS1:         +30.2°C
>> VTS2:          +0.0°C
>> VTS3:          +0.0°C
>> VTS4:          +0.0°C
>> VTS5:          +0.0°C
>>
>> So VTS2-5 seem like they may not actually be connected, but the rest at
>> least look somewhat sensible. I'd probably still keep the names as they
>> at least might give an indication what the sensors could be for.
>>
>> But there's a good chance that we're missing something on how MS
>> envisions these sensors to work exactly.
> 
> I think the takeaway here is that I'll keep the sensors disabled for
> now on SL7 until we have a better idea and not block this driver

I had an idea.. maybe the busted sensor is for something modem-related.
My unit doesn't come with one.

Konrad