From: "Michał Kępień" <kernel@kempniu.pl>
To: Darren Hart <dvhart@infradead.org>
Cc: Jonathan Woithe <jwoithe@just42.net>,
Rafael Wysocki <rjw@rjwysocki.net>,
Andy Shevchenko <andy@infradead.org>,
platform-driver-x86@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/10] fujitsu-laptop: use device-specific data instead of module-wide globals
Date: Sat, 6 May 2017 14:45:16 +0200 [thread overview]
Message-ID: <20170506124516.GA1075@kmp-mobile.hq.kempniu.pl> (raw)
In-Reply-To: <20170506123107.GA2516@kmp-mobile.hq.kempniu.pl>
> Just to make sure we are all on the same page here, choosing the "two
> separate modules, each with one driver for one ACPI device" approach
> would mean ending up with two modules:
>
> - fujitsu-laptop, binding to the FUJ02E3 ACPI device, handling
> everything _except_ backlight,
>
> - fujitsu-backlight, binding to the FUJ02B1 ACPI device, handling
> backlight and depending on fujitsu-laptop.
>
> We would need to export one function from fujitsu-laptop, namely
> fext_backlight(). I understand this would require creating a separate
> header file which would then be included in fujitsu-backlight.
>
> fext_backlight() causes the FUNC method of the FUJ02E3 ACPI device to be
> called. This method is marked as Serialized, which AFAIU means we do
> not need a separate lock in kernel code because all calls to this method
> are implicitly serialized by firmware itself.
>
> I do not see anything "unnatural" in this approach, but I would love to
> be corrected if I am wrong.
To be fair, one thing that may be "unnatural" with this approach is that
even though fujitsu-backlight would depend on fujitsu-laptop, it would
still have to get a handle to FUJ02E3 using:
acpi_get_handle(NULL, "\\_SB.FEXT", ...)
because call_fext_func() - and thus fext_backlight() - needs to be
passed a handle to FUJ02E3 and the two ACPI devices (FUJ02B1 handled by
fujitsu-backlight and FUJ02E3 handled by fujitsu-laptop) are not related
from the perspective of the ACPI device hierarchy. Unless there is a
better way of implementing this, in which case I am open to suggestions.
--
Best regards,
Michał Kępień
next prev parent reply other threads:[~2017-05-06 12:45 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-24 13:33 [PATCH 00/10] fujitsu-laptop: use device-specific data instead of module-wide globals Michał Kępień
2017-04-24 13:33 ` [PATCH 01/10] platform/x86: fujitsu-laptop: introduce fext_*() helper functions Michał Kępień
2017-05-01 13:13 ` Jonathan Woithe
2017-05-02 13:24 ` Michał Kępień
2017-04-24 13:33 ` [PATCH 02/10] platform/x86: fujitsu-laptop: shorten names of acpi_handle fields Michał Kępień
2017-05-01 13:19 ` Jonathan Woithe
2017-05-01 16:09 ` Darren Hart
2017-04-24 13:33 ` [PATCH 03/10] platform/x86: fujitsu-laptop: explicitly pass ACPI handle to call_fext_func() Michał Kępień
2017-04-24 13:33 ` [PATCH 04/10] platform/x86: fujitsu-laptop: rework backlight power synchronization Michał Kępień
2017-05-01 13:32 ` Jonathan Woithe
2017-05-01 16:17 ` Darren Hart
2017-04-24 13:33 ` [PATCH 05/10] platform/x86: fujitsu-laptop: distinguish current uses of device-specific data Michał Kępień
2017-05-01 13:40 ` Jonathan Woithe
2017-04-24 13:33 ` [PATCH 06/10] platform/x86: fujitsu-laptop: allocate struct fujitsu_bl in acpi_fujitsu_bl_add() Michał Kępień
2017-04-24 13:33 ` [PATCH 07/10] platform/x86: fujitsu-laptop: use device-specific data in backlight code Michał Kępień
2017-04-24 13:33 ` [PATCH 08/10] platform/x86: fujitsu-laptop: allocate struct fujitsu_laptop in acpi_fujitsu_laptop_add() Michał Kępień
2017-04-24 13:33 ` [PATCH 09/10] platform/x86: fujitsu-laptop: use device-specific data in LED-related code Michał Kępień
2017-04-24 13:33 ` [PATCH 10/10] platform/x86: fujitsu-laptop: use device-specific data in remaining module code Michał Kępień
2017-05-01 13:05 ` [PATCH 00/10] fujitsu-laptop: use device-specific data instead of module-wide globals Jonathan Woithe
2017-05-02 13:21 ` Michał Kępień
2017-05-04 23:40 ` Jonathan Woithe
2017-05-05 16:15 ` Darren Hart
2017-05-06 12:31 ` Michał Kępień
2017-05-06 12:45 ` Michał Kępień [this message]
2017-05-06 14:21 ` Andy Shevchenko
2017-05-06 14:23 ` Andy Shevchenko
2017-05-08 16:01 ` Darren Hart
2017-05-09 9:35 ` Michał Kępień
2017-05-09 12:13 ` Jonathan Woithe
2017-05-09 16:47 ` Darren Hart
2017-05-09 21:24 ` Rafael J. Wysocki
2017-05-11 13:52 ` Michał Kępień
2017-05-11 14:37 ` Rafael J. Wysocki
2017-05-11 15:38 ` Darren Hart
2017-05-11 13:40 ` Michał Kępień
2017-05-15 23:27 ` Darren Hart
2017-05-16 0:06 ` Jonathan Woithe
2017-05-16 6:40 ` Michał Kępień
2017-05-15 23:56 ` Jonathan Woithe
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