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authorHarald Geyer <harald@ccbib.org>2015-07-07 13:39:31 +0000
committerJonathan Cameron <jic23@kernel.org>2015-07-20 18:41:20 +0100
commit081d974031bafb204d64de3e82f398daf1d0b899 (patch)
tree6859eb7ca8777b832bb39e185f1611bebed3fa9e /drivers/iio/humidity
parent5fbb0bc466b7b43036b1dd8c9e9166ca9e69e07a (diff)
iio: dht11: Use new function ktime_get_resolution_ns()
This cleans up the most ugly workaround in this driver. There are no functional changes yet in the decoding algorithm, but we improve the following things: * Get rid of spurious warning messages on systems with fast HRTIMER. * If the clock is not fast enough for decoding to work, we give up immediately. * In that case we return EAGAIN instead of EIO, so it's easier to discriminate causes of failure. Returning EAGAIN is somewhat controversial: It's technically correct as a faster clock might become available. OTOH once all clocks are enabled this is a permanent error. There is no ECLOCKTOOSLOW error code. Signed-off-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.c42
1 files changed, 22 insertions, 20 deletions
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
index 91976e06f1c6..1165b1c4f9d6 100644
--- a/drivers/iio/humidity/dht11.c
+++ b/drivers/iio/humidity/dht11.c
@@ -33,6 +33,7 @@
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
+#include <linux/timekeeping.h>
#include <linux/iio/iio.h>
@@ -89,23 +90,11 @@ static unsigned char dht11_decode_byte(int *timing, int threshold)
return ret;
}
-static int dht11_decode(struct dht11 *dht11, int offset)
+static int dht11_decode(struct dht11 *dht11, int offset, int timeres)
{
- int i, t, timing[DHT11_BITS_PER_READ], threshold,
- timeres = DHT11_SENSOR_RESPONSE;
+ int i, t, timing[DHT11_BITS_PER_READ], threshold;
unsigned char temp_int, temp_dec, hum_int, hum_dec, checksum;
- /* Calculate timestamp resolution */
- for (i = 1; i < dht11->num_edges; ++i) {
- t = dht11->edges[i].ts - dht11->edges[i - 1].ts;
- if (t > 0 && t < timeres)
- timeres = t;
- }
- if (2 * timeres > DHT11_DATA_BIT_HIGH) {
- pr_err("dht11: timeresolution %d too bad for decoding\n",
- timeres);
- return -EIO;
- }
threshold = DHT11_DATA_BIT_HIGH / timeres;
if (DHT11_DATA_BIT_LOW / timeres + 1 >= threshold)
pr_err("dht11: WARNING: decoding ambiguous\n");
@@ -128,7 +117,7 @@ static int dht11_decode(struct dht11 *dht11, int offset)
if (((hum_int + hum_dec + temp_int + temp_dec) & 0xff) != checksum)
return -EIO;
- dht11->timestamp = iio_get_time_ns();
+ dht11->timestamp = ktime_get_real_ns();
if (hum_int < 20) { /* DHT22 */
dht11->temperature = (((temp_int & 0x7f) << 8) + temp_dec) *
((temp_int & 0x80) ? -100 : 100);
@@ -156,7 +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 = iio_get_time_ns();
+ dht11->edges[dht11->num_edges].ts = ktime_get_real_ns();
dht11->edges[dht11->num_edges++].value =
gpio_get_value(dht11->gpio);
@@ -172,10 +161,22 @@ static int dht11_read_raw(struct iio_dev *iio_dev,
int *val, int *val2, long m)
{
struct dht11 *dht11 = iio_priv(iio_dev);
- int ret;
+ int ret, timeres;
mutex_lock(&dht11->lock);
- if (dht11->timestamp + DHT11_DATA_VALID_TIME < iio_get_time_ns()) {
+ if (dht11->timestamp + DHT11_DATA_VALID_TIME < ktime_get_real_ns()) {
+ timeres = ktime_get_resolution_ns();
+ if (DHT11_DATA_BIT_HIGH < 2 * timeres) {
+ dev_err(dht11->dev, "timeresolution %dns too low\n",
+ timeres);
+ /* In theory a better clock could become available
+ * at some point ... and there is no error code
+ * that really fits better.
+ */
+ ret = -EAGAIN;
+ goto err;
+ }
+
reinit_completion(&dht11->completion);
dht11->num_edges = 0;
@@ -210,7 +211,8 @@ static int dht11_read_raw(struct iio_dev *iio_dev,
ret = dht11_decode(dht11,
dht11->num_edges == DHT11_EDGES_PER_READ ?
DHT11_EDGES_PREAMBLE :
- DHT11_EDGES_PREAMBLE - 2);
+ DHT11_EDGES_PREAMBLE - 2,
+ timeres);
if (ret)
goto err;
}
@@ -277,7 +279,7 @@ static int dht11_probe(struct platform_device *pdev)
return -EINVAL;
}
- dht11->timestamp = iio_get_time_ns() - DHT11_DATA_VALID_TIME - 1;
+ dht11->timestamp = ktime_get_real_ns() - DHT11_DATA_VALID_TIME - 1;
dht11->num_edges = -1;
platform_set_drvdata(pdev, iio);