linux-kernel - Re: [PATCH v4 1/3] iio: Add IIO_DELTA

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Date:   Mon, 7 Aug 2023 15:25:17 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Nuno Sá <noname.nuno@...il.com>
CC:     Ramona Bolboaca <ramona.bolboaca@...log.com>, <jic23@...nel.org>,
        <nuno.sa@...log.com>, <linux-iio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] iio: Add IIO_DELTA_ANGL channel type

On Mon, 07 Aug 2023 16:26:17 +0200
Nuno Sá <noname.nuno@...il.com> wrote:

> On Mon, 2023-08-07 at 14:12 +0300, Ramona Bolboaca wrote:
> > The delta angle is defined as a piece-wise integration of angular
> > velocity data. The delta angle represents the amount of
> > angular displacement between two consecutive measurements and it
> > is measured in radians.
> > 
> > In order to track the total angular displacement during a desired
> > period of time, simply sum-up the delta angle samples acquired
> > during that time.
> > 
> > IIO currently does not offer a suitable channel type for this
> > type of measurements hence this patch adds it.
> > 
> > Signed-off-by: Ramona Bolboaca <ramona.bolboaca@...log.com>
> > ---
> >  Documentation/ABI/testing/sysfs-bus-iio | 14 ++++++++++++++
> >  drivers/iio/industrialio-core.c         |  1 +
> >  include/uapi/linux/iio/types.h          |  1 +
> >  tools/iio/iio_event_monitor.c           |  2 ++
> >  4 files changed, 18 insertions(+)
> > 
> > diff --git a/Documentation/ABI/testing/sysfs-bus-iio
> > b/Documentation/ABI/testing/sysfs-bus-iio
> > index a2854dc9a839..32675fa7dc6f 100644
> > --- a/Documentation/ABI/testing/sysfs-bus-iio
> > +++ b/Documentation/ABI/testing/sysfs-bus-iio
> > @@ -279,6 +279,20 @@ Description:
> >                 but should match other such assignments on device).
> >                 Units after application of scale and offset are m/s^2.
> >  
> > +What:          /sys/bus/iio/devices/iio:deviceX/in_deltaangl_x_raw
> > +What:          /sys/bus/iio/devices/iio:deviceX/in_deltaangl_y_raw
> > +What:          /sys/bus/iio/devices/iio:deviceX/in_deltaangl_z_raw  
> 
> I wonder if we also need to add these to the scan element specific bits? From a
> quick look, it seems not all supported attributes are in there so I'm not sure
> what's the policy in here :)
> 
Yeah, should add them for everything the driver uses.  I forgot about that.
Intent is that anyone grepping will find the docs so they need to be complete.

Jonathan

> 
> - Nuno Sá