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Message-ID: <CAMknhBGFBwQQouhsPMgCuMn6+eQfDCcSzJvF-DwJAnoEPvMLAA@mail.gmail.com>
Date: Fri, 29 Sep 2023 12:53:00 -0500
From: David Lechner <dlechner@...libre.com>
To: linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-staging@...ts.linux.dev
Cc: David Lechner <david@...hnology.com>,
Jonathan Cameron <jic23@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Nuno Sá <nuno.sa@...log.com>,
Axel Haslam <ahaslam@...libre.com>,
Philip Molloy <pmolloy@...libre.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 14/27] staging: iio: resolver: ad2s1210: implement
hysteresis as channel attr
On Fri, Sep 29, 2023 at 12:25 PM David Lechner <dlechner@...libre.com> wrote:
>
> The AD2S1210 resolver has a hysteresis feature that can be used to
> prevent flicker in the LSB of the position register. This can be either
> enabled or disabled. Disabling hysteresis is useful for increasing
> precision by oversampling.
>
> Signed-off-by: David Lechner <dlechner@...libre.com>
> ---
...
> +static int ad2s1210_read_avail(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + const int **vals, int *type,
> + int *length, long mask)
> +{
> + static const int hysteresis_available[] = { 0, 1 };
This is basically an enable/disable. Should the 1 value be changed to the
appropriate radians value since this is hysteresis on the position
(angle) channel?
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_HYSTERESIS:
> + switch (chan->type) {
> + case IIO_ANGL:
> + *vals = hysteresis_available;
> + *type = IIO_VAL_INT;
> + *length = ARRAY_SIZE(hysteresis_available);
> + return IIO_AVAIL_LIST;
> + default:
> + return -EINVAL;
> + }
> + default:
> + return -EINVAL;
> + }
> +}
>
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