[PATCH] iio: sgp40: retain documentation in driver

From: Andreas Klinger
Date: Wed Aug 21 2024 - 06:05:17 EST


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@xxxxxxxxxxxxx>
---
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

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