linux-kernel - [PATCH] iio: sgp40: retain documentation in driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZsWdFOIkDtEB9WGO@mail.your-server.de>
Date: Wed, 21 Aug 2024 09:53:56 +0200
From: Andreas Klinger <ak@...klinger.de>
To: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>,
	Lars-Peter Clausen <lars@...afoo.de>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org, Andreas Klinger <ak@...klinger.de>
Subject: [PATCH] iio: sgp40: retain documentation in driver

Retain documentation on how the voc index is actually calculated in
driver code as it'll be removed in Documentation.

This is a follow up on patch "[PATCH] iio: ABI: remove duplicate
in_resistance_calibbias" from David.

Signed-off-by: Andreas Klinger <ak@...klinger.de>
---
 drivers/iio/chemical/sgp40.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/chemical/sgp40.c b/drivers/iio/chemical/sgp40.c
index 7f0de14a1956..07d8ab830211 100644
--- a/drivers/iio/chemical/sgp40.c
+++ b/drivers/iio/chemical/sgp40.c
@@ -14,11 +14,16 @@
  * 1) read raw logarithmic resistance value from sensor
  *    --> useful to pass it to the algorithm of the sensor vendor for
  *    measuring deteriorations and improvements of air quality.
+ *    It can be read from the attribute in_resistance_raw.
  *
- * 2) calculate an estimated absolute voc index (0 - 500 index points) for
- *    measuring the air quality.
+ * 2) calculate an estimated absolute voc index (in_concentration_input)
+ *    with 0 - 500 index points) for measuring the air quality.
  *    For this purpose the value of the resistance for which the voc index
- *    will be 250 can be set up using calibbias.
+ *    will be 250 can be set up using in_resistance_calibbias (default 30000).
+ *
+ *    The voc index is calculated as:
+ *      x = (in_resistance_raw - in_resistance_calibbias) * 0.65
+ *      in_concentration_input = 500 / (1 + e^x)
  *
  * Compensation values of relative humidity and temperature can be set up
  * by writing to the out values of temp and humidityrelative.
-- 
2.39.2

Download attachment "signature.asc" of type "application/pgp-signature" (660 bytes)