From: Andy Shevchenko <andriy.shevchenko@intel.com>
To: Salah Triki <salah.triki@gmail.com>
Cc: "Marcelo Schmitt" <marcelo.schmitt@analog.com>,
"Jonathan Cameron" <jic23@kernel.org>,
"David Lechner" <dlechner@baylibre.com>,
"Nuno Sá" <nuno.sa@analog.com>,
"Andy Shevchenko" <andy@kernel.org>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] iio: temperature: max30208: fix wrong scale value
Date: Tue, 28 Apr 2026 19:02:16 +0300 [thread overview]
Message-ID: <afDaCLfAH2RHtqQw@ashevche-desk.local> (raw)
In-Reply-To: <20260428155349.68019-1-salah.triki@gmail.com>
On Tue, Apr 28, 2026 at 04:53:49PM +0100, Salah Triki wrote:
> The driver currently returns a scale of 5 for IIO_CHAN_INFO_SCALE, which
> leads to incorrect temperature readings.
>
> According to the MAX30208 datasheet, the temperature resolution is 0.005°C
> per LSB. Using IIO_VAL_FRACTIONAL with 5/1000 correctly represents this
> 16-bit resolution.
>
> Although this is a change in the ABI, the current scale is objectively
> incorrect. A raw reading of 5000 (25°C) is currently reported as 25000°C,
> making the driver unusable with standard IIO tools. Given the magnitude
> of the error (factor of 1000) and the fact that the driver is relatively
> recent, fixing it to match the hardware specification is necessary.
Seems the analysis is wrong (as per Jonathan's comment in v1). What are the
user space tools you referring to?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2026-04-28 16:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-28 15:53 [PATCH v2] iio: temperature: max30208: fix wrong scale value Salah Triki
2026-04-28 16:02 ` Andy Shevchenko [this message]
2026-04-28 16:13 ` Salah Triki
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=afDaCLfAH2RHtqQw@ashevche-desk.local \
--to=andriy.shevchenko@intel.com \
--cc=andy@kernel.org \
--cc=dlechner@baylibre.com \
--cc=jic23@kernel.org \
--cc=linux-iio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=marcelo.schmitt@analog.com \
--cc=nuno.sa@analog.com \
--cc=salah.triki@gmail.com \
/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