The old code was based on a DHT11 datasheet which specifies a measurement
range of 20%-90% RH. Turns out the sensor actually reports values outside
this range, so we should support it as far as possible.
Reported-by: Edward Attfield <edward@xxxxxxxxxxx>
Signed-off-by: Harald Geyer <harald@xxxxxxxxx>
---
drivers/iio/humidity/dht11.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
index df6bab4..1a9f8f4 100644
--- a/drivers/iio/humidity/dht11.c
+++ b/drivers/iio/humidity/dht11.c
@@ -159,7 +159,7 @@ static int dht11_decode(struct dht11 *dht11, int offset)
}
dht11->timestamp = ktime_get_boot_ns();
- if (hum_int < 20) { /* DHT22 */
+ if (hum_int < 4) { /* DHT22: 100000 = (3*256+232)*100 */
dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) *
((temp_int & 0x80) ? -100 : 100);
dht11->humidity = ((hum_int << 8) + hum_dec) * 100;
--
2.1.4
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