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

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Date:	Wed, 05 Aug 2015 22:30:22 -0700
From:	Joe Perches <joe@...ches.com>
To:	Chen Yu <yu.c.chen@...el.com>
Cc:	dvhart@...radead.org, akpm@...ux-foundation.org, arnd@...db.de,
	mchehab@....samsung.com, gregkh@...uxfoundation.org,
	jslaby@...e.com, linux-kernel@...r.kernel.org,
	platform-driver-x86@...r.kernel.org, rui.zhang@...el.com,
	rafael.j.wysocki@...el.com, mika.westerberg@...el.com
Subject: Re: [PATCH] surface pro 3: Add support driver for Surface Pro 3
 buttons

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

> +	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;

> +	case SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_UP:
> +		pressed = true;
> +	case SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_UP:
> +		key_code = KEY_VOLUMEUP;
> +		break;

> +	case SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_DOWN:
> +		pressed = true;
> +	case SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_DOWN:
> +		key_code = KEY_VOLUMEDOWN;
> +		break;
> +	default:
> +		dev_info(&device->dev,
> +				  "Unsupported event [0x%x]\n", event);

It might be useful to ratelimit this


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