linux-kernel - Re: Purpose of parameter in sysfs binary read

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Message-ID: <20090819191944.23e6e0ee@lxorguk.ukuu.org.uk>
Date:	Wed, 19 Aug 2009 19:19:44 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Rick L. Vinyard, Jr." <rvinyard@...nmsu.edu>
Cc:	"Greg KH" <greg@...ah.com>,
	"Linux USB" <linux-usb@...r.kernel.org>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: Purpose of parameter in sysfs binary read

> But, in addition to sending keystroke output you can send a usb control
> message to change the backlight color and an interrupt message to load a
> bitmap as an image.

Ok that actually fits the LCD interface model a bit better, but the LCD
class right now is a hack inside of a single driver so eventually needs
fixing

> The bitmap itself is simple, but requires a specific format. Byte 0 must
> be 0x03 followed by 31 bytes of null. The low bit of byte 32 is x,y (0,0)
> second high bit is (0,1)... with low bit of byte 33 being (1,0)...

How big is it and can it be used for general purpose graphics - I know
the G19 is something like 320x240 but the G13 ?
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