HC-SRO4 ultrasonic distance driver

[Johannes Thoma]

Hi all,

I wrote a driver for the popular HC-SRO4 ultrasonic distance sensor. It 
is beta and has been tested
on the Raspberry PI by me and my brother: here is the stand-alone repo:

https://github.com/johannesthoma/linux-hc-sro4

I would like to contribute it to the linux kernel, however I am a little 
bit nervous reading through
the Documentation/Submitting[Patches][Drivers] documentation (in 
particular the How to piss off
a kernel developer sections ;), so I wanted to ask if I could post the 
patch (it will be against the
char/mics device kernel tree at 
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
, I think this is the correct location) on this list first, maybe 
someone can tell me if the formatting
and the driver are correct..

I also have some driver specific questions:

*) First, does it really belong to drivers/misc ? There are other 
sensors there as well, so I suppose
this location is right.

*) As of now, I've created a new device class "distance" where the sysfs 
control files live in (so
the configuration file is /sys/class/distance/configure ), it works for 
me (tm) but I don't know
if code that creates new device classes would be accepted. Is there 
another solution to put
the control files in? Maybe under /sys/class/gpio?

*) I've filled out the parent device field in 
device_create_with_groups() to NULL, I'm not sure if this
is right. If I put a parent, should it be the GPIO device (the HC_SRO4 
is attached to two GPIO pins)?

*) When I submit the patch, I've read that one should cc the maintainers 
(that would be Arnd Bergmann <arnd at arndb.de> and Greg Kroah-Hartman 
<gregkh at linuxfoundation.org>) but on what list should
I post the patch at all? Is it lkml.org?

Please let me know if it ok to post the patch to this list first.

Thanks a lot,

- Johannes