linux-kernel - Re: [PATCH] iio: light: apds9960: Fix iio_event

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Message-ID: <CAJCx=g=WaGiBFYJTTjNgzrnW3We0qpuMvyy9iFAVDC8Mkbscsg@mail.gmail.com>
Date:   Fri, 11 Nov 2022 10:50:35 +0800
From:   Matt Ranostay <matt.ranostay@...sulko.com>
To:     Subhajit Ghosh <subhajit.ghosh@...technology.com>
Cc:     jic23@...nel.org, lars@...afoo.de, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH] iio: light: apds9960: Fix iio_event_spec structures

On Thu, Nov 10, 2022 at 10:45 PM Subhajit Ghosh
<subhajit.ghosh@...technology.com> wrote:
>
>
> >>                 .type = IIO_EV_TYPE_THRESH,
> >>                 .dir = IIO_EV_DIR_RISING,
> >> -               .mask_separate = BIT(IIO_EV_INFO_VALUE) |
> >> -                       BIT(IIO_EV_INFO_ENABLE),
> >> +               .mask_separate = BIT(IIO_EV_INFO_VALUE),
> >
> > Probably more concise to use the following, and you won't need to add
> > an additional item to the structs.
> >
> >    .mask_separate = BIT(IIO_EV_INFO_VALUE),
> >    .mask_shared_by_type = BIT(IIO_EV_INFO_ENABLE),
> >
>
> Above is the first thing I tried.
>
> Current implementation:
>
> root@...32mp1:~# ls -1 /sys/bus/iio/devices/iio:device0/events/
> in_intensity_clear_thresh_falling_en
> in_intensity_clear_thresh_falling_value
> in_intensity_clear_thresh_rising_en
> in_intensity_clear_thresh_rising_value
>
> in_proximity_thresh_falling_en
> in_proximity_thresh_falling_value
> in_proximity_thresh_rising_en
> in_proximity_thresh_rising_value
>
>
> First method (Which you are suggesting):
> .mask_separate = BIT(IIO_EV_INFO_VALUE),
> .mask_shared_by_type = BIT(IIO_EV_INFO_ENABLE),
>
> root@...32mp1:~# ls -1 /sys/bus/iio/devices/iio:device0/events/
> in_intensity_clear_thresh_falling_value
> in_intensity_clear_thresh_rising_value
> in_intensity_thresh_falling_en
> in_intensity_thresh_rising_en
>
> The above says all channels with with the type IIO_INTENSITY has
> the same enable but we require this particular channel (in_intensity_clear)
> regardless of direction to have the same enable.
> Using mask_shared_by_dir and mask_shared_by_all does not provide the logical
> attribute name.
>
>
> This patch provides the below:
>
> root@...32mp1:~# ls -1 /sys/bus/iio/devices/iio:device0/events/
> in_intensity_clear_thresh_either_en
> in_intensity_clear_thresh_falling_value
> in_intensity_clear_thresh_rising_value
>
> in_proximity_thresh_either_en
> in_proximity_thresh_falling_value
> in_proximity_thresh_rising_value
>
> Verified using iio_event_monitor:
>
> root@...32mp1:~# ./iio_event_monitor /dev/iio:device0
> Event: time: 1647143384807582753, type: proximity, channel: 0, evtype: thresh, direction: either
>

Hmm maybe Jonathan will have some feedback on this (and if it is okay
to break the ABI interface). Been awhile since I've touched
this driver and a little rusty on iio events.  But I am guessing your
method makes sense since the event(s) has direction and a type, and
can't just have one of the .mask_shared_by_dir and mask_shared_by_type.

In any case:

Reviewed-by: Matt Ranostay <matt.ranostay@...sulko.com>


- Matt

>
> Regards
> Subhajit Ghosh
>
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