linux-kernel - Re: private field in led

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Message-ID: <20100310110153.GA6838@const.bordeaux.inria.fr>
Date:	Wed, 10 Mar 2010 12:01:53 +0100
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	lenz@...wisc.edu, rpurdie@...nedhand.com
Subject: Re: private field in led_classdev?

Samuel Thibault, le Wed 10 Mar 2010 10:44:52 +0100, a écrit :
> Greg KH, le Tue 09 Mar 2010 18:54:11 -0800, a écrit :
> > On Sun, Mar 07, 2010 at 03:31:12PM +0100, Samuel Thibault wrote:
> > > Would there be an objection to adding a void *private field to the
> > > led_classdev struct?  It would be a lot less burden for the input
> > > key board leds support for finding out the keyboard device from the
> > > brightness_set callback, as each device may have a long series of leds,
> > > not just a fixed number of them.
> > 
> > What's wrong with using the private pointer in the struct device
> > instead?
> 
> Ah, right. In my case there is a struct device corresponding to the
> actual input device. I hadn't realized that since registering a led
> creates a new device, I have another private pointer which I can use.

One issue, however, is that led_classdev_register() calls
led_trigger_set_default(), which eventually calls the brightness_set
hook, but the private field (platform_data) still hasn't been
initialized, so the brightness_set hook has to abort setting the initial
state. In my case, after led_classdev_register and setting
platform_data, I can call the low level function by hand, it's just not
very pretty...

Samuel
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