Re: Purpose of parameter in sysfs binary read

From: Pavel Machek
Date: Tue Aug 25 2009 - 07:36:36 EST


> > 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...

(cesky, pictures)
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