Greg,
It is up to the userspace app to decide whether to use cached
("eeprom") or non-cached ("eeprom-nc") sysfs interface.
Example: SFP module
It exposes two 256-byte EEPROM(-like) devices at 0x50 and 0x51.
0x50 is static vendor/part info and can be cached.
0x51 is real-time diagnostic data and cannot be cached.
Unfortunately, 0x51 does not have any identifying bits telling us that
it is real-time data.
(If it did, it would be easy to check and remember this when 0x51 is probed.)
-- Petri
On Tue, Sep 1, 2009 at 4:39 PM, Greg KH<greg@xxxxxxxxx> wrote:
> On Tue, Sep 01, 2009 at 04:15:00PM -0700, Petri Gynther wrote:
>> Add "eeprom-nc" sysfs attribute to provide non-cached read access
>> to EEPROM data. This is needed because some EEPROM-like devices
>> contain constantly changing real-time diagnostic data that cannot
>> be cached in kernel memory.
>
> How are we going to know which attribute to use?
>
> For all new sysfs attributes, you have to add a Documentation/ABI/ file
> as well, care to do that here?
>
> thanks,
>
> greg k-h
>
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