linux-kernel - Re: [PATCH] surface pro 3: Add support driver for Surface Pro 3 buttons

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Date:	Wed, 5 Aug 2015 16:47:15 -0700
From:	Darren Hart <dvhart@...radead.org>
To:	"Chen, Yu C" <yu.c.chen@...el.com>
Cc:	"joe@...ches.com" <joe@...ches.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Zhang, Rui" <rui.zhang@...el.com>,
	"jslaby@...e.com" <jslaby@...e.com>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Westerberg, Mika" <mika.westerberg@...el.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"mchehab@....samsung.com" <mchehab@....samsung.com>,
	"arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH] surface pro 3: Add support driver for Surface Pro 3
 buttons

On Thu, Aug 06, 2015 at 11:20:44AM +0000, Chen, Yu C wrote:
> Thanks Joe,
> On Wed, 2015-08-05 at 22:30 -0700, Joe Perches wrote:
> > On Thu, 2015-08-06 at 13:16 +0800, Chen Yu wrote:
> > > Since Surface Pro 3 does not follow the specs of "Windows ACPI Design
> > > Guide for SoC Platform", code in drivers/input/misc/soc_array.c can
> > > not detect these buttons on it.
> > 
> > style trivia:
> > 
> > > diff --git a/drivers/platform/x86/surfacepro3_button.c b/drivers/platform/x86/surfacepro3_button.c
> > []
> > > +static void surface_button_notify(struct acpi_device *device, u32 event)
> > > +{
> > []
> > > +	switch (event) {
> > > +	case SURFACE_BUTTON_NOTIFY_PRESS_POWER:
> > > +		pressed = true;
> > > +		/*go through*/
> > 
> > /* fall through */ is more common
> > 
> OK.
> > > +	case SURFACE_BUTTON_NOTIFY_PRESS_HOME:
> > > +		pressed = true;
> > > +	case SURFACE_BUTTON_NOTIFY_RELEASE_HOME:
> > > +		key_code = KEY_LEFTMETA;
> > > +		break;
> > 
> > It may be better to add a comment about the style or
> > maybe add a macro like
> > 
> > #define HANDLE_SURFACE_BUTTON_NOTIFY(type, code)	\
> > 	case SURFACE_BUTTON_NOTIFY_PRESS_##type:	\
> > 		pressed = true;	/* and fall-through */	\
> > 	case SURFACE_BUTTON_NOTIFY_RELEASE_##type:	\
> > 		key_code = code;			\
> > 		break;
> > 
> WRT macro HANDLE_SURFACE_BUTTON_NOTIFY, the checkpatch.pl
> complains that multi lines of codes should be wrapped in 'do
> while'state, but doing like this might lead to incorrect semantic.
> Is it ok to keep these codes and add comments like:
> /*
>  * When a button(power button/volume button/home button) is 
>  * pressed down or released, different ACPI notification codes 
>  * will be generated. We can distinguish different event code 
>  * and value of buttons by these notification codes, then pass
>  * (EV_KEY, event code(key_code), value(pressed)) to input layer.
>  */

The commentary is useful regardless. However, I suspect Joe was
referring to the approach pairing the PRESS and RELEASE cases?

-- 
Darren Hart
Intel Open Source Technology Center
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