linux-kernel - Re: [PATCH 2/2] hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k

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Date:	Sat, 28 Mar 2015 07:13:25 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Steven Honeyman <stevenhoneyman@...il.com>,
	Paul Bolle <pebolle@...cali.nl>
CC:	Pali Rohár <pali.rohar@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jean Delvare <jdelvare@...e.de>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Jochen Eisinger <jochen@...guin-breeder.org>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [PATCH 2/2] hwmon: Allow to compile dell-smm-hwmon driver without
 /proc/i8k

On 03/28/2015 05:54 AM, Steven Honeyman wrote:
> On 28 March 2015 at 11:04, Paul Bolle <pebolle@...cali.nl> wrote:
>> On Sat, 2015-03-28 at 11:24 +0100, Pali Rohár wrote:
>>> --- a/drivers/hwmon/Kconfig
>>> +++ b/drivers/hwmon/Kconfig
>>> @@ -1703,6 +1703,17 @@ config SENSORS_ULTRA45
>>>          This driver provides support for the Ultra45 workstation environmental
>>>          sensors.
>>>
>>> +config SENSORS_DELL_SMM
>>> +     tristate "Dell laptop SMM BIOS hwmon driver"
>>> +     depends ON X86
>>
>> How did this past your testing?
>>
>>> +     ---help---
>>> +       This hwmon driver adds support for reporting temperature of different
>>> +       sensors and controls the fans on Dell laptops via System Management
>>> +       Mode provided by Dell BIOS.
>>> +
>>> +       When option I8K is also enabled this driver provides legacy /proc/i8k
>>> +       userspace interface for i8kutils package.
>>> +
>
> It's working OK for me (after fixing the mistake pointed out above).
>
> [Latitude e6540]
> -----
> coretemp-isa-0000
> Adapter: ISA adapter
> Physical id 0:  +53.0°C  (high = +84.0°C, crit = +100.0°C)
> Core 0:         +51.0°C  (high = +84.0°C, crit = +100.0°C)
> Core 1:         +53.0°C  (high = +84.0°C, crit = +100.0°C)
>
> i8k-virtual-0
> Adapter: Virtual device
> Processor Fan: 3171 RPM
> CPU:            +52.0°C
> Ambient:        +46.0°C
> SODIMM:         +40.0°C
> -----
>
> Ambient and SODIMM look swapped - but it's probably just another Dell
> error. I really need to look at getting coreboot on this thing.
>
> On 28 March 2015 at 10:24, Pali Rohár <pali.rohar@...il.com> wrote:
> ...
>>   config I8K
>> -       tristate "Dell laptop support"
>> -       select HWMON
>> +       bool "Dell i8k legacy laptop support"
>> +       select SENSORS_DELL_SMM
> ...
>> +config SENSORS_DELL_SMM
>> +       tristate "Dell laptop SMM BIOS hwmon driver"
>
> The only change I'd suggest is not to change the tristate to bool for
> I8K. Forcing that to bool means that SENSORS_DELL_SMM can't be
> compiled as a module if the user wishes to keep i8k hanging around
> "just in case". It'll probably annoy distro kernel packagers too.
>

Agreed. It also still needs to select HWMON (SENSORS_DELL_SMM is
only visible if HWMON is selected).

Guenter

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