Re: [PATCH 3.9] Driver for 7-segment displays connected over GPIOs

On Mon, Jan 07, 2013 at 05:42:05PM +0100, Thomas Petazzoni wrote:

Dear drivers/{char,misc}/ maintainers,

This patch series implements a simple driver for 7-segment displays
connected over GPIOs through a BCD encoder. The userspace interface of
the driver is very simple: just a "value" file in the sysfs directory
of the device, which can be written to (changes the value shown on the
7-segment display) and read (gives the current value).

If you ever add/remove/modify sysfs files, you have to also do the same
for the Documentation/ABI/ files as well, please redo that in this patch
series.

But, the bigger question is, why is this a kernel driver at all?  Can't
you do this from userspace today without any new kernel code?

thanks,

greg k-h