linux-kernel - Re: Git backlight subsystem tree

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Date:	Thu, 8 Feb 2007 15:41:27 -0800
From:	Greg KH <greg@...ah.com>
To:	James Simmons <jsimmons@...radead.org>
Cc:	Richard Purdie <rpurdie@...ys.net>,
	LKML <linux-kernel@...r.kernel.org>,
	akpm <akpm@...ux-foundation.org>,
	Marcin Juszkiewicz <openembedded@....one.pl>
Subject: Re: Git backlight subsystem tree

On Thu, Feb 08, 2007 at 09:54:21PM +0000, James Simmons wrote:
> 
> > On Thu, Feb 08, 2007 at 06:32:02PM +0000, James Simmons wrote:
> > > On Thu, 8 Feb 2007, Richard Purdie wrote:
> > > 
> > > > On Thu, 2007-02-08 at 15:28 +0000, James Simmons wrote:
> > > > > I have some patches that move the backlight away from using the class 
> > > > > stuff. The only problem is the patch requires all backlight devices 
> > > > > to be linked to a real struct device. Right now the acpi backligths are 
> > > > > not.
> > > > 
> > > > Why would you want to do that?
> > > > 
> > > > The whole point of having this is so that backlights appear as a
> > > > standard interface under /sys/class/backlight.
> > > > 
> > > > An example of why standardised interfaces are good would be someone
> > > > writing an applet for a handheld to control the backlight brightness.
> > > > With the class in place, the applet can easily work with any backlight.
> > > > Without it, it has to be written for each backlight.
> > > > 
> > > > So this is a very strong NAK but I'm curious why you'd want to do it...
> > > 
> > > I CC Greg to explain. The backlight class didn't go away. The way it is 
> > > handled is different.
> > 
> > Have a pointer to the patch so I can help explain better?
> > 
> > As a short summary, 'struct class_device' is going away.  Using a
> > 'struct device' in its place is what the conversion should have just
> > done, no functionality change otherwise.
> 
> diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c

<snip>

Looks good to me.  And it makes the code simpler too :)

thanks,

greg k-h
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