fetching calibration data from flash

[Matti Laakso]

On 10.06.2014 10:54, Kalle Valo wrote:
> Matti Laakso <malaakso at elisanet.fi> writes:
>
>>> a) Use platform data, like ath9k does.
>>>
>>> b) add a module option to ath10k, and let ath10k fetch the files via mtd 
>>> API.
>>>      Has the downside of requiring MTD (maybe add a config option to 
>>> disable that?),
>>>      but i like that more than the ath9k way of reading an arbitrary 
>>> memory region and
>>>      circumventing the MTD layer.
>>>
>>> Any thoughts? I can prepare a patch if needed.
>> There's yet another method: Use platform data to provide only a file
>> name and then use request_firmware to load it from a file under
>> /lib/firmware. Then it is up to the platform support code to get the
>> data there. This is used in OpenWrt by rt2x00 drivers.
> That's true. Now that you mention this, I remember that this was also
> suggested in linux-wireless list for wl1251 (a long time ago when I was
> still working on that driver). And there doesn't even need to a real
> file in the filesystem, it's possible to implement a udev script which
> does what it ever needs to feed the data to the kernel, be it reading
> from MTD partition or whatever.
>
> But why let the user name provide the file name? Why cannot it be a
> fixed name, like "cal.bin"?
>

If there are multiple WNICs each with its own calibration data?