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

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Message-ID: <20090825113619.GB1341@ucw.cz>
Date:	Tue, 25 Aug 2009 13:36:19 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rick L. Vinyard, Jr." <rvinyard@...nmsu.edu>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, 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

Hi!

> > If its a bitmap image why not register the device as a framebuffer ?
> >
> 
> Would that preclude it also being registered as a HID? The primary purpose
> of the device is to function as a keypad input.
> 
> 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.
> 
> 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)...

Sounds very much like auxdisplay things we already have in tree...

-- 
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