Messages in this thread | | | Date | Sat, 28 Mar 2015 15:20:41 -0700 | From | Guenter Roeck <> | Subject | Re: [PATCH 2/2] hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k |
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On 03/28/2015 03:00 PM, Pali Rohár wrote: > On Saturday 28 March 2015 13:54:51 Steven Honeyman wrote: >> On 28 March 2015 at 11:04, Paul Bolle <pebolle@tiscali.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. >> > > Both patches do not change any code. So there should not be any > type swapped with or without my patch. > > Cpu type is requested via SMM in same way as it is doing old DOS > executable. So there can be maybe problem in DELL SMM handler too > or maybe just I did not understand correctly assembler dump of > DOS executable... > >> On 28 March 2015 at 10:24, Pali Rohár <pali.rohar@gmail.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. >> >> >> Thanks, >> Steven > > My idea was: > > SENSORS_DELL_SMM enable/disable compilation of kernel driver > (ether statically link into kernel image or as external module) > > CONFIG_I8K just enable /proc/i8k code in SENSORS_DELL_SMM -- no > additional driver, just boolean switch which has effect only iff > SENSORS_DELL_SMM is Y or M >
Maybe that is the plan, but it is not what is happening. I8K selects SENSORS_DELL_SMM, so a boolean I8K forces SENSORS_DELL_SMM to be built into the kernel.
What you suggest would work if I8K would depend on SENSORS_DELL_SMM, but then the symbols would not be backward-compatible.
Guenter
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