linux-kernel - Re: [PATCH] export getledstate()

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Date:	Tue, 19 Feb 2008 11:45:15 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Karl Dahlke <eklhad@...cast.net>
Cc:	linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com
Subject: Re: [PATCH] export getledstate()

On Tue, 19 Feb 2008 13:57:23 -0500 Karl Dahlke wrote:

> I write adapters for disabled people, and we often have to do
> specialized functions based on keystrokes and key chords.
> I would like to do certain things when keys are hit and num lock is on,
> but there is no easy way to get the led state.
> There is a nice function getledstate()
> in keyboard.c, it just isn't exported.
> Here is the patch that would do that.
> Can you apply this patch, or, is there another easy way to get this information,
> or, would it be better to fold this information into keyboard_notifier_param,
> along with shift state etc.
> I use notifiers, so this would be natural, and almost as easy.
> I'd be happy to write that patch, if you think that would be a superior design.

cc Dmitry added.

I don't oppose the export, but it seems that using getledstate()
asynchronously could return out-of-sync info, while adding this info
to the notifier data would synchronize the info..
Maybe it depends on how it's done.

> 
> --- drivers/char/keyboard.c	2008-02-18 21:05:23.000000000 -0500
> +++ drivers/char/keyboard.c.new	2008-02-18 21:06:34.000000000 -0500

--- linux/drivers/char/keyboard.c.old
+++ linux/drivers/char/keyboard.c

is the preferred form.  (a) keep the top-level linux dir name.
(b) the +++ line has the correct file name.

> @@ -963,6 +963,7 @@ unsigned char getledstate(void)
>  {
>  	return ledstate;
>  }
> +EXPORT_SYMBOL_GPL(getledstate);
>  
>  void setledstate(struct kbd_struct *kbd, unsigned int led)
>  {


---
~Randy
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