Renaming of devices in 2.6.31

[Lars-Peter Clausen]

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Michael 'Mickey' Lauer wrote:
> Am Sonntag, den 22.11.2009, 23:43 +0100 schrieb Lars-Peter Clausen:
>
>> Joerg Reisenweber wrote:
>>> [Lars-Peter Clausen So  22. November 2009]:
>>>> Michael 'Mickey' Lauer wrote:
>>>>> Am Sonntag, den 22.11.2009, 18:19 +0100 schrieb Lars-Peter
>>>>> Clausen:
>>>>>
>>>>>> But: pm-bt is gone anyway pm-gps is gone soon pm-gsm
>>>>>> might also go away, but if it's not it'll be renamed
>>>>>> back.
>>>>> Is anyone preparing a document for the poor userland folks
>>>>> that will get their peripheral control means ripped up side
>>>>> down?
>>>> Not yet. But once the kernel work has been done and there are
>>>> no more changes to be expected, I guess there will be
>>>> detailed information what has changed.
>>> Great, so let's stop userland development until that day :-(
>> Why do you want to do that?
>>> You're aware of  http://wiki.openmoko.org/wiki/GTA02_sysfs ?
>> Yes. And I think it's pretty confusing.
>>>>>> gta02-vibrator is called gta02::vibrator. And this will
>>>>>> stay.
>>>>>>
>>>>> So gta01 will have a gta02::vibrator, oh well, there's much
>>>>>  worse things in life than not making sense :)
>>>> No gta01 has gta01::vibrator
>>> OMG
>> I know you can't understand that. But I'm following specs here
>
> I question the sanity of specs that say that a device with the
> _same_ interface and semantics has to be exposed through different
> names via sysfs. Can you point me to the relevant docs, please?
You are free to do that.


The naming spec for leds can be found at:
http://www.mjmwired.net/kernel/Documentation/leds-class.txt
>> and from a userspace perspective it shouldn't matter whether the
>> it's call neo1973::vibrator gta01::vibrator or
>> ldksaldwaieaz::vibrator
>
> "Matter" is relative. It's about being able to rely on what the
> kerneprovides to userland or not. The effect is that with this
> attitude userland is forced to introduce more files that have to be
>  handmaintained whenever the chique of the day requires another
> renaming.
>
> I would understand it if there were any technical necessities for
> that, but just because you can or blindly following specs does not
> make it a strong point to me.
Uhm... In case you missed the pattern: "*::vibrator"

- - Lars

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