Re: [lm-sensors] Datasheet for Fintek F71868a

[Guenter Roeck <linux@roeck-us.net>]

On 02/28/2016 10:36 AM, Fulcrum wrote:
>
> On 02/29/2016 01:54 AM, Guenter Roeck wrote:
>
>> The kernel log should tell you when you load the driver without force_id.
>
> I tried loading the driver without force_id, and it did work. I learnt
> about force_id for this chip in some forum post, and never thought of loading the driver without force_id. Here are the kernel logs (dmesg):
>
> [25369.887005] f71882fg: Found f71868a chip at 0x290, revision 48
> [25369.887150] f71882fg f71882fg.656: Fan: 1 is in duty-cycle mode
> [25369.887177] f71882fg f71882fg.656: Fan: 2 is in duty-cycle mode
> [25369.887202] f71882fg f71882fg.656: Fan: 3 is in duty-cycle mode
>
> There was no chip id in dmesg logs though.
>
It tells you the chip name, so it isn't considered to be necessary.

>> If sensors-detect provides the chip name, its ID is recognized.
> Here is the f71868a related output from sensors-detect:
>
> Driver `to-be-written':
> * ISA bus, address 0x295
> Chip `Fintek F71868A Super IO Sensors' (confidence: 9)
>
> Note: there is no driver for Fintek F71868A Super IO Sensors yet.
> Check http://www.lm-sensors.org/wiki/Devices for updates.
>
> No chip id here either.
>
>> Are you sure the driver doesn't load without force_id ?
>> If so, do you see a message in the kernel log ? What does it say ?
>> There should be something like
>>      f71882fg: Unsupported Fintek device: <hex ID>
>> in the log.
>>
>
> Does work without force_id.
>
>> No, this is not an auto-loading driver. The kernel does not support auto-loading
>> Super-IO chip drivers. In case you wonder: It shouldn't, because Super-IO chip
>> detection is not well defined. Running sensors-detect is critical enough; even
>> that asks you and says "This is _usually_ safe" (emphasis added). We don't really
>> want to do this automatically with every boot.
>
> I didn't know about auto-loading problem with Super-IO chip drivers.
> This fact and the faulty output from sensors-detect were the reasons
> behind this long convesation. LOL
>

Glad I could help. On mystery solved, thousands to go ;-)

> Thanks a lot for helping me and this information.
>
My pleasure.

Thanks,
Guenter



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