iio: humidity: dht11: Allow non-zero decimals

The DHT11 datasheet is pretty cryptic, but it does suggest that after each integer value (humidity and temperature) there are "decimal" values. Validate these as integers in the range 0-9 and treat them as tenths of a unit. Link: #6220 Signed-off-by: Phil Elwell <[email protected]>
raspberrypi · Nov 6, 2024 · ce65ed0 · ce65ed0
1 parent e9e852a
commit ce65ed0
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
@@ -152,9 +152,9 @@ static int dht11_decode(struct dht11 *dht11, int offset)
 		dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) *
 					((temp_int & 0x80) ? -100 : 100);
 		dht11->humidity = ((hum_int << 8) + hum_dec) * 100;
-	} else if (temp_dec == 0 && hum_dec == 0) {  /* DHT11 */
-		dht11->temperature = temp_int * 1000;
-		dht11->humidity = hum_int * 1000;
+	} else if (temp_dec < 10 && hum_dec < 10) {  /* DHT11 */
+		dht11->temperature = temp_int * 1000 + temp_dec * 100;
+		dht11->humidity = hum_int * 1000 + hum_dec * 100;
 	} else {
 		dev_err(dht11->dev,
 			"Don't know how to decode data: %d %d %d %d\n",