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* [PATCH] iio: dht11: Use boottime
@ 2016-01-27 22:46 Abhilash Jindal
  2016-01-30 17:50 ` Jonathan Cameron
  0 siblings, 1 reply; 6+ messages in thread
From: Abhilash Jindal @ 2016-01-27 22:46 UTC (permalink / raw)
  To: linux-iio; +Cc: jic23, Abhilash Jindal

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>
---
 drivers/iio/humidity/dht11.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
index 1165b1c..cfc5a05 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);
-- 
1.7.9.5


^ permalink raw reply related	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2016-02-01  5:15 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-01-27 22:46 [PATCH] iio: dht11: Use boottime Abhilash Jindal
2016-01-30 17:50 ` Jonathan Cameron
2016-01-30 19:11   ` Harald Geyer
2016-01-31  5:08     ` Abhilash Jindal
2016-01-31 10:09       ` Harald Geyer
2016-02-01  5:15         ` Abhilash Jindal

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