[PATCH] misc devices: HC-SRO4 ultrasonic distance driver

[johannes@johannesthoma.com (Johannes Thoma)]

Dear Greg, dear Daniel,

Thank you for your suggestions,  I will port the driver to IIO layer as
you suggested and then get back (may take some days).  I will also use 
git-send-mail, since that seems to be the best way to do it.

Am 24.03.16 um 16:52 schrieb Daniel Baluta:
> On Thu, Mar 24, 2016 at 5:02 PM, Johannes Thoma
> <johannes@johannesthoma.com> wrote:
>>   From 56e8f71c990b92c28a8cb03d859880eab8d06a3d Mon Sep 17 00:00:00 2001
>> From: Johannes Thoma <johannes@johannesthoma.com>
>> Date: Mon, 21 Mar 2016 22:11:01 +0100
>> Subject: [PATCH] HC-SRO4 ultrasonic distance sensor driver
>>
>> The HC-SRO4 is an ultrasonic distance sensor attached to two GPIO
>> pins. The driver is controlled via sysfs and supports an (in theory)
>> unlimited number of HC-SRO4 devices.
>>
>> Unlike user land solutions this driver produces precise results
>> even when there is high load on the system. It uses a non-blocking
>> interrupt triggered mechanism to record the length of the echo
>> signal.
>
> Add link to datasheet.

One location is:

http://www.micropik.com/PDF/HCSR04.pdf

>>
>> This patch is against the raspberry pi kernel from
>> https://github.com/raspberrypi/linux.git hash
>> e481b5ceae6c94c7e60f8bb8591cbb362806246e
>>
>> Note that this patch isn't meant for lkml (yet) see:
>> TODO's:
>>
>> .) Patch against mainline (or whatever kernel it belongs to)
>> .) Use IIO layer instead of creating random sysfs entries.
>
> So, why aren't you directly using IIO? :)
>
I will but I just got the hint from greg that I should do
so (didn't know about it ;).

all the best,

- Johannes