linux-kernel - Re: [patch 1/5] video sysfs support - take 2: Add dev argument for backlight_device

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Date:	Tue, 9 Jan 2007 23:09:38 +0800
From:	"Luming Yu" <luming.yu@...il.com>
To:	"Richard Purdie" <rpurdie@...ys.net>
Cc:	"Andrew Morton" <akpm@...l.org>, "Pavel Machek" <pavel@....cz>,
	len.brown@...el.com, "Matt Domsch" <Matt_Domsch@...l.com>,
	"Alessandro Guido" <alessandro.guido@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	jengelh@...ux01.gwdg.de, gelma@...ma.net, ismail@...dus.org.tr,
	"Richard Hughes" <hughsient@...il.com>
Subject: Re: [patch 1/5] video sysfs support - take 2: Add dev argument for backlight_device_register.

On 12/30/06, Richard Purdie <rpurdie@...ys.net> wrote:
> On Wed, 2006-11-08 at 00:33 +0800, Yu Luming wrote:
> > This patch set adds generic abstract layer support for acpi video driver to have
> > generic user interface to control backlight and output switch control by leveraging
> > the existing backlight sysfs class driver, and by adding a new video output sysfs
> > class driver.
> >
> > Patch 1/5:  adds dev argument for backlight_device_register to link the class device
> > to real device object. The platform specific driver should find a way to get the real
> > device object for their video device.
> >
> > signed-off-by: Luming Yu <Luming.yu@...el.com>
> > ---
> >  drivers/acpi/asus_acpi.c            |    2 +-
> >  drivers/acpi/ibm_acpi.c             |    2 +-
> >  drivers/acpi/toshiba_acpi.c         |    3 ++-
> >  drivers/video/backlight/backlight.c |    7 +++++--
> >  include/linux/backlight.h           |    2 +-
> >  5 files changed, 10 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
> > index 27597c5..1d97cdf 100644
> > --- a/drivers/video/backlight/backlight.c
> > +++ b/drivers/video/backlight/backlight.c
> > @@ -190,8 +190,10 @@ static int fb_notifier_callback(struct n
> >   * Creates and registers new backlight class_device. Returns either an
> >   * ERR_PTR() or a pointer to the newly allocated device.
> >   */
> > -struct backlight_device *backlight_device_register(const char *name, void *devdata,
> > -                                                struct backlight_properties *bp)
> > +struct backlight_device *backlight_device_register(const char *name,
> > +     struct device *dev,
> > +     void *devdata,
> > +     struct backlight_properties *bp)
> >  {
> >       int i, rc;
> >       struct backlight_device *new_bd;
>
> This patch breaks several platforms. If you're going to add parameters
> to a function like backlight_device_register, you could at least grep
> the tree and update all the users :-(.

yes, you are right.  I just noticed that there are so many users when I sent
out that patch. And all these users were disabled when I was testing patch.
I'm sorry for that.

>
> To top it off, someone noticed some of the failures and fixed them but
> nobody thought to fix the drivers in drivers/video/backlight itself and
> a mac reference seems to have escaped too.

If my memory serves me well,  there is a patch for mac in mm.
Not sure other drivers in video/backlight. But I should have sent it
to some place.
Need to check.

>
> I'll send a patch to to Andrew to clean up this mess...
>
thank you!
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