From: Jonathan Cameron <jic23@kernel.org>
To: Paul Cercueil <paul@crapouillou.net>
Cc: Peter Rosin <peda@axentia.se>,
od@zcrc.me, linux-iio@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] iio: afe: rescale: Implement write_raw
Date: Sat, 15 Feb 2020 18:32:49 +0000 [thread overview]
Message-ID: <20200215183249.2100b6e9@archlinux> (raw)
In-Reply-To: <20200210225438.112660-2-paul@crapouillou.net>
On Mon, 10 Feb 2020 19:54:38 -0300
Paul Cercueil <paul@crapouillou.net> wrote:
> Implement write_raw by converting the value if writing the scale, or
> just calling the managed channel driver's write_raw otherwise.
>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
> drivers/iio/afe/iio-rescale.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c
> index 95802d9ee25e..a48f6af9316d 100644
> --- a/drivers/iio/afe/iio-rescale.c
> +++ b/drivers/iio/afe/iio-rescale.c
> @@ -35,6 +35,27 @@ struct rescale {
> int *scale_data;
> };
>
> +static int rescale_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct rescale *rescale = iio_priv(indio_dev);
> + unsigned long long tmp;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SCALE:
> + tmp = val * 1000000000LL;
> + do_div(tmp, rescale->numerator);
> + tmp *= rescale->denominator;
> + do_div(tmp, 1000000000LL);
> + return iio_write_channel_attribute(rescale->source, tmp, 0,
> + IIO_CHAN_INFO_SCALE);
Why is val2 always 0? Won't that only work if the backend device
has integer scales?
> + default:
> + return iio_write_channel_attribute(rescale->source,
> + val, val2, mask);
> + }
> +}
> +
> static int rescale_convert(struct rescale *rescale, int type,
> const int val, const int val2,
> int *val_out, int *val2_out)
> @@ -110,6 +131,7 @@ static int rescale_read_avail(struct iio_dev *indio_dev,
> }
>
> static const struct iio_info rescale_info = {
> + .write_raw = rescale_write_raw,
> .read_raw = rescale_read_raw,
> .read_avail = rescale_read_avail,
> };
next prev parent reply other threads:[~2020-02-15 18:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 22:54 [PATCH 1/2] iio: afe: rescale: Add support for converting scale avail table Paul Cercueil
2020-02-10 22:54 ` [PATCH 2/2] iio: afe: rescale: Implement write_raw Paul Cercueil
2020-02-15 18:32 ` Jonathan Cameron [this message]
2020-07-20 23:16 ` Paul Cercueil
2020-07-26 12:41 ` Jonathan Cameron
2020-07-27 9:16 ` Peter Rosin
2020-07-27 9:22 ` [PATCH 1/2] iio: afe: rescale: Add support for converting scale avail table Peter Rosin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200215183249.2100b6e9@archlinux \
--to=jic23@kernel.org \
--cc=linux-iio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=od@zcrc.me \
--cc=paul@crapouillou.net \
--cc=peda@axentia.se \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).