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iio: humidity: dht11: Allow non-zero decimals

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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: https://github.com/raspberrypi/linux/issues/6220

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
This commit is contained in:
Phil Elwell
2024-11-04 14:10:53 +00:00
committed by Dom Cobley
parent 6fa2c584ba
commit e8a0f3edf2
1 changed files with 3 additions and 3 deletions
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6
drivers/iio/humidity/dht11.c
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@@ -151,9 +151,9 @@ static int dht11_decode(struct dht11 *dht11, int offset)
dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) * dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) *
((temp_int & 0x80) ? -100 : 100); ((temp_int & 0x80) ? -100 : 100);
dht11->humidity = ((hum_int << 8) + hum_dec) * 100; dht11->humidity = ((hum_int << 8) + hum_dec) * 100;
} else if (temp_dec == 0 && hum_dec == 0) { /* DHT11 */ } else if (temp_dec < 10 && hum_dec < 10) { /* DHT11 */
dht11->temperature = temp_int * 1000; dht11->temperature = temp_int * 1000 + temp_dec * 100;
dht11->humidity = hum_int * 1000; dht11->humidity = hum_int * 1000 + hum_dec * 100;
} else { } else {
dev_err(dht11->dev, dev_err(dht11->dev,
"Don't know how to decode data: %d %d %d %d\n", "Don't know how to decode data: %d %d %d %d\n",