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authorAbhilash Jindal <klock.android@gmail.com>2016-01-28 01:46:02 +0300
committerJonathan Cameron <jic23@kernel.org>2016-02-01 23:16:13 +0300
commit17a2f46c3d8877fe2a0b6ff391d1df30e67892a6 (patch)
treeb9157688a9f3e3ebe04306ea2db4c5746708db50 /drivers/iio/humidity
parentddeb35cbd6221751f0197ffaa9500da31e8337f4 (diff)
downloadlinux-17a2f46c3d8877fe2a0b6ff391d1df30e67892a6.tar.xz
iio: dht11: Use boottime
Wall time obtained from ktime_get_real_ns is susceptible to sudden jumps due to user setting the time or due to NTP. Boot time is constantly increasing time better suited for comparing two timestamps. Signed-off-by: Abhilash Jindal <klock.android@gmail.com> Reviewed-by: Harald Geyer <harald@ccbib.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/humidity')
-rw-r--r--drivers/iio/humidity/dht11.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
index 1165b1c4f9d6..cfc5a051ab9f 100644
--- a/drivers/iio/humidity/dht11.c
+++ b/drivers/iio/humidity/dht11.c
@@ -117,7 +117,7 @@ static int dht11_decode(struct dht11 *dht11, int offset, int timeres)
if (((hum_int + hum_dec + temp_int + temp_dec) & 0xff) != checksum)
return -EIO;
- dht11->timestamp = ktime_get_real_ns();
+ dht11->timestamp = ktime_get_boot_ns();
if (hum_int < 20) { /* DHT22 */
dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) *
((temp_int & 0x80) ? -100 : 100);
@@ -145,7 +145,7 @@ static irqreturn_t dht11_handle_irq(int irq, void *data)
/* TODO: Consider making the handler safe for IRQ sharing */
if (dht11->num_edges < DHT11_EDGES_PER_READ && dht11->num_edges >= 0) {
- dht11->edges[dht11->num_edges].ts = ktime_get_real_ns();
+ dht11->edges[dht11->num_edges].ts = ktime_get_boot_ns();
dht11->edges[dht11->num_edges++].value =
gpio_get_value(dht11->gpio);
@@ -164,7 +164,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev,
int ret, timeres;
mutex_lock(&dht11->lock);
- if (dht11->timestamp + DHT11_DATA_VALID_TIME < ktime_get_real_ns()) {
+ if (dht11->timestamp + DHT11_DATA_VALID_TIME < ktime_get_boot_ns()) {
timeres = ktime_get_resolution_ns();
if (DHT11_DATA_BIT_HIGH < 2 * timeres) {
dev_err(dht11->dev, "timeresolution %dns too low\n",
@@ -279,7 +279,7 @@ static int dht11_probe(struct platform_device *pdev)
return -EINVAL;
}
- dht11->timestamp = ktime_get_real_ns() - DHT11_DATA_VALID_TIME - 1;
+ dht11->timestamp = ktime_get_boot_ns() - DHT11_DATA_VALID_TIME - 1;
dht11->num_edges = -1;
platform_set_drvdata(pdev, iio);