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33 lines
1.3 KiB
Diff
33 lines
1.3 KiB
Diff
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From ce65ed02cb6707ae5c9f3a304f5b0124f4eed559 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Mon, 4 Nov 2024 14:10:53 +0000
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Subject: [PATCH] iio: humidity: dht11: Allow non-zero decimals
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The DHT11 datasheet is pretty cryptic, but it does suggest that after
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each integer value (humidity and temperature) there are "decimal"
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values. Validate these as integers in the range 0-9 and treat them as
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tenths of a unit.
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Link: https://github.com/raspberrypi/linux/issues/6220
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/iio/humidity/dht11.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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--- a/drivers/iio/humidity/dht11.c
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+++ b/drivers/iio/humidity/dht11.c
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@@ -152,9 +152,9 @@ static int dht11_decode(struct dht11 *dh
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dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) *
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((temp_int & 0x80) ? -100 : 100);
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dht11->humidity = ((hum_int << 8) + hum_dec) * 100;
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- } else if (temp_dec == 0 && hum_dec == 0) { /* DHT11 */
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- dht11->temperature = temp_int * 1000;
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- dht11->humidity = hum_int * 1000;
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+ } else if (temp_dec < 10 && hum_dec < 10) { /* DHT11 */
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+ dht11->temperature = temp_int * 1000 + temp_dec * 100;
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+ dht11->humidity = hum_int * 1000 + hum_dec * 100;
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} else {
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dev_err(dht11->dev,
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"Don't know how to decode data: %d %d %d %d\n",
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