diff options
| author | Harald Geyer <harald@ccbib.org> | 2018-02-11 14:09:40 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2018-02-17 15:03:16 +0300 |
| commit | a6bffb6920d16fb2ef4ba072fac5b64b36b1c254 (patch) | |
| tree | c78fa9fce5d4f2c43082c5e40b6d3fb4946896e5 /drivers/iio/humidity/dht11.c | |
| parent | 7fe2241c0ed6e6940924ed58fec8877f72e1279d (diff) | |
| download | linux-a6bffb6920d16fb2ef4ba072fac5b64b36b1c254.tar.xz | |
iio: dht11: Improve detection of sensor type
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@attfield.ca>
Signed-off-by: Harald Geyer <harald@ccbib.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/humidity/dht11.c')
| -rw-r--r-- | drivers/iio/humidity/dht11.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c index df6bab40d6fa..1a9f8f4ffb88 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; |