Re: [RFC PATCH 0/5] iio: move 'modes' initialization to core

[Alexandru Ardelean]

On Sat, Dec 5, 2020 at 8:42 PM Jonathan Cameron <jic23@xxxxxxxxxx> wrote:
>
> On Thu, 3 Dec 2020 12:04:18 +0200
> Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote:
>
> > I stumbled over this, while trying to implement some changes to the IIO
> > buffer logic.
> > Seems that most drivers have a INDIO_DIRECT_MODE, and some have
> > INDIO_BUFFER_SOFTWARE only as a workaround for not having multiple IIO
> > buffer-support-per-IIO-device (yet).
>
> Examples of that particular corner case would be good from a discussion
> point of view.
>
> It's been a while though and those cases were always 'interesting'
> so I may have misremembered how it works!
>
> It is definitely also used to indicate cases where there is no trigger
> to expose (usually devices doing DMA blocks or using a fifo).
> That was the original intent IIRC.
>
> >
> > Since a lot of drivers seem to only support INDIO_DIRECT_MODE, it begs the
> > question whether this starts to make sense as a default 'modes'
> > initialization.
>
> Hmm. Do we need to set it at all, or can we just make it implicit?
> I'm not sure if that is semantically worse than having it set by default
> or not.  Thinking about it I think we do want to set it just for
> consistency purposes.
>
> I'm a bit in two minds about this set.  It obviously is a noop from
> functional point of view, but it's kind of nice to see the modes
> explicitly called out.  I guess we started walking down this route
> anyway when we set IIO_TRIGGERED_BUFFER inside those setup routines.
>
> The bit that bothers me is that it isn't really a 'default' as such
> it just the most common value.  I wonder if we could be more clever
> and set it only if there as a channel with _RAW or _PROCESSED
> though that would involve moving it to the registration rather than
> creation.

I'll try to think about it a bit more as well.
I stumbled over this while trying to organize the modes a bit with
triggered-buffer, kfifo and stuff like that.
And this was a quick draft to start a discussion.
But, maybe after some IIO devices get merged into a single IIO device
[with multiple buffers], this would be a little easier to do.


>
> Jonathan
>
> >
> > It opens up the idea of hiding 'indio_dev->modes' inside IIO core, with
> > functions like '{devm_}iio_triggered_buffer_setup()' being able to extend
> > the setup of these 'modes'.
> > This idea is far from being ready, but I thought I'd try this RFC instead
> > as a discussion starter in that direction.
> >
> > Alexandru Ardelean (5):
> >   iio: core: initialize 'modes' to INDIO_DIRECT_MODE by default
> >   iio,counter: remove modes init for INDIO_DIRECT_MODE only drivers
> >   iio: remove modes init for INDIO_DIRECT_MODE only drivers (manual)
> >   iio: adc: ad7768-1: remove explicit modes initialization
> >   iio: magnetometer: rm3100: remove explicit modes initialization
> >
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> >  drivers/iio/resolver/ad2s1200.c                   | 1 -
> >  drivers/iio/resolver/ad2s90.c                     | 1 -
> >  drivers/iio/temperature/hid-sensor-temperature.c  | 1 -
> >  drivers/iio/temperature/iqs620at-temp.c           | 1 -
> >  drivers/iio/temperature/ltc2983.c                 | 1 -
> >  drivers/iio/temperature/max31856.c                | 1 -
> >  drivers/iio/temperature/maxim_thermocouple.c      | 1 -
> >  drivers/iio/temperature/mlx90614.c                | 1 -
> >  drivers/iio/temperature/mlx90632.c                | 1 -
> >  drivers/iio/temperature/tmp006.c                  | 1 -
> >  drivers/iio/temperature/tmp007.c                  | 1 -
> >  drivers/iio/temperature/tsys01.c                  | 1 -
> >  drivers/iio/temperature/tsys02d.c                 | 1 -
> >  drivers/input/touchscreen/tsc2007_iio.c           | 1 -
> >  drivers/platform/x86/toshiba_acpi.c               | 1 -
> >  drivers/staging/iio/accel/adis16203.c             | 1 -
> >  drivers/staging/iio/accel/adis16240.c             | 1 -
> >  drivers/staging/iio/adc/ad7280a.c                 | 1 -
> >  drivers/staging/iio/adc/ad7816.c                  | 1 -
> >  drivers/staging/iio/addac/adt7316.c               | 1 -
> >  drivers/staging/iio/cdc/ad7150.c                  | 2 --
> >  drivers/staging/iio/cdc/ad7746.c                  | 1 -
> >  drivers/staging/iio/frequency/ad9832.c            | 1 -
> >  drivers/staging/iio/frequency/ad9834.c            | 1 -
> >  drivers/staging/iio/meter/ade7854.c               | 1 -
> >  drivers/staging/iio/resolver/ad2s1210.c           | 1 -
> >  319 files changed, 1 insertion(+), 321 deletions(-)
> >
>