linux-kernel - Re: [PATCH v2 1/3] backlight: introduce backlight_device

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Message-ID: <1379423017.2218.0.camel@ThinkPad-X230.localdomain>
Date:	Tue, 17 Sep 2013 17:03:37 +0400
From:	Igor Gnatenko <i.gnatenko.brain@...il.com>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	linux-acpi@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel@...ll.ch>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Lee Chun-Yi <joeyli.kernel@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Yves-Alexis Perez <corsac@...ian.org>,
	Felipe Contreras <felipe.contreras@...il.com>,
	Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
	Jani Nikula <jani.nikula@...ux.intel.com>
Subject: Re: [PATCH v2 1/3] backlight: introduce backlight_device_registered

On Tue, 2013-09-17 at 17:23 +0800, Aaron Lu wrote:
> Introduce a new API for modules to query if a specific type of backlight
> device has been registered. This is useful for some backlight device
> provider module(e.g. ACPI video) to know if a native control
> interface(e.g. the interface created by i915) is available and then do
> things accordingly(e.g. avoid register its own on Win8 systems).
> 
> Signed-off-by: Aaron Lu <aaron.lu@...el.com>
Tested-by: Igor Gnatenko <i.gnatenko.brain@...il.com>
> ---
>  drivers/video/backlight/backlight.c | 31 +++++++++++++++++++++++++++++++
>  include/linux/backlight.h           |  4 ++++
>  2 files changed, 35 insertions(+)

-- 
Igor Gnatenko
Fedora release 20 (Heisenbug)
Linux 3.12.0-0.rc1.git0.1.fc20.x86_64

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