linux-kernel - Re: wl1251 & mac address & calibration data

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Date:   Fri, 16 Dec 2016 11:40:27 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Daniel Wagner <wagi@...om.org>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Tom Gundersen <teg@...m.no>,
        Johannes Berg <johannes@...solutions.net>,
        Ming Lei <ming.lei@...onical.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sebastian Reichel <sre@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Michal Kazior <michal.kazior@...to.com>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        "linux-wireless" <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Takashi Iwai <tiwai@...e.de>,
        Josh Boyer <jwboyer@...oraproject.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: wl1251 & mac address & calibration data

On Friday 16 December 2016 08:25:44 Daniel Wagner wrote:
> On 12/16/2016 03:03 AM, Luis R. Rodriguez wrote:
> > For the new API a solution for "fallback mechanisms" should be
> > clean though and I am looking to stay as far as possible from the
> > existing mess. A solution to help both the old API and new API is
> > possible for the "fallback mechanism" though -- but for that I can
> > only refer you at this point to some of Daniel Wagner and Tom
> > Gunderson's firmwared deamon prospect. It should help pave the way
> > for a clean solution and help address other stupid issues.
> 
> The firmwared project is hosted here
> 
> https://github.com/teg/firmwared
> 
> As Luis pointed out, firmwared relies on
> FW_LOADER_USER_HELPER_FALLBACK, which is not enabled by default.

I know. But it does not mean that I cannot enable this option at kernel 
compile time.

Bigger problem is that currently request_firmware() first try to load 
firmware directly from VFS and after that (if fails) fallback to user 
helper.

So I would need to extend kernel firmware code with new function (or 
flag) to not use VFS and try only user mode helper.

> I
> don't see any reason why firmwared should not also support loading
> calibration data. If we find a sound way to do this.

It can, but why should I use another daemon for firmware loading as 
non-systemd version of udev (and eudev fork) support firmware loading? 
I think I stay with udev/eudev.

> As you can see from the commit history it is a pretty young project
> and more ore less reanimation of the old udev firmware loader
> feature.  We are getting int into shape, adding integration tests
> etc.
> 
> The main motivation for this project is the get movement back in
> stuck discussion on the firmware loader API. Luis was very busy
> writing up all the details on the current situation and purely from
> the amount of documentation need to describe the API you can tell
> something is awry.
> 
> Thanks,
> Daniel

-- 
Pali Rohár
pali.rohar@...il.com

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