linux-kernel - Re: [PATCH] USB: input: wacom_sys.c: format OLED image in kernel

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Message-ID: <20121004072528.GD14217@core.coreip.homeip.net>
Date:	Thu, 4 Oct 2012 00:25:28 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Przemo Firszt <przemo@...szt.eu>
Cc:	rob@...dley.net, pinglinux@...il.com, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH] USB: input: wacom_sys.c: format OLED image in kernel

Hi Przemo,

On Sun, Sep 09, 2012 at 03:37:18PM -0400, Przemo Firszt wrote:
> This patch adds a new way of handling Wacom Intuos4 family OLEDs.
> Previously the images had to be 'scrambled' by userland application. Now
> the 'scrambling' is done in the kernel module, so user space can send
> simple 64x32 pixels 4-bit grayscale (2 pixels per byte) 0,0 in top left corner
> images straight to a wacom OLED sysfs entry. An example:
> 
> dd bs=1024 if=image_file \
> of=/sys/bus/usb/drivers/wacom/[DevNo]/wacom_led/button[No]_formattedimg \
> count=1
> 
> This patch greatly simplifies user space preparation of the image.
> The raw image sysfs enties are still present to avoid breaking API.

I do not not believe that we should add code to the kernel for tasks that
can be just as easily performed in userspace.

Thanks!

-- 
Dmitry
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