diff options
Diffstat (limited to 'drivers/iio/humidity/dht11.c')
| -rw-r--r-- | drivers/iio/humidity/dht11.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c index 7d79a1ac5f5f..343d26af1dd8 100644 --- a/drivers/iio/humidity/dht11.c +++ b/drivers/iio/humidity/dht11.c @@ -46,7 +46,8 @@ * Note that when reading the sensor actually 84 edges are detected, but * since the last edge is not significant, we only store 83: */ -#define DHT11_EDGES_PER_READ (2*DHT11_BITS_PER_READ + DHT11_EDGES_PREAMBLE + 1) +#define DHT11_EDGES_PER_READ (2 * DHT11_BITS_PER_READ + \ + DHT11_EDGES_PREAMBLE + 1) /* Data transmission timing (nano seconds) */ #define DHT11_START_TRANSMISSION 18 /* ms */ @@ -95,24 +96,24 @@ static int dht11_decode(struct dht11 *dht11, int offset) /* Calculate timestamp resolution */ for (i = 1; i < dht11->num_edges; ++i) { - t = dht11->edges[i].ts - dht11->edges[i-1].ts; + t = dht11->edges[i].ts - dht11->edges[i - 1].ts; if (t > 0 && t < timeres) timeres = t; } - if (2*timeres > DHT11_DATA_BIT_HIGH) { + if (2 * timeres > DHT11_DATA_BIT_HIGH) { pr_err("dht11: timeresolution %d too bad for decoding\n", - timeres); + timeres); return -EIO; } threshold = DHT11_DATA_BIT_HIGH / timeres; - if (DHT11_DATA_BIT_LOW/timeres + 1 >= threshold) + if (DHT11_DATA_BIT_LOW / timeres + 1 >= threshold) pr_err("dht11: WARNING: decoding ambiguous\n"); /* scale down with timeres and check validity */ for (i = 0; i < DHT11_BITS_PER_READ; ++i) { - t = dht11->edges[offset + 2*i + 2].ts - - dht11->edges[offset + 2*i + 1].ts; - if (!dht11->edges[offset + 2*i + 1].value) + t = dht11->edges[offset + 2 * i + 2].ts - + dht11->edges[offset + 2 * i + 1].ts; + if (!dht11->edges[offset + 2 * i + 1].value) return -EIO; /* lost synchronisation */ timing[i] = t / timeres; } @@ -166,7 +167,7 @@ static irqreturn_t dht11_handle_irq(int irq, void *data) } static int dht11_read_raw(struct iio_dev *iio_dev, - const struct iio_chan_spec *chan, + const struct iio_chan_spec *chan, int *val, int *val2, long m) { struct dht11 *dht11 = iio_priv(iio_dev); @@ -192,13 +193,13 @@ static int dht11_read_raw(struct iio_dev *iio_dev, goto err; ret = wait_for_completion_killable_timeout(&dht11->completion, - HZ); + HZ); free_irq(dht11->irq, iio_dev); if (ret == 0 && dht11->num_edges < DHT11_EDGES_PER_READ - 1) { dev_err(&iio_dev->dev, - "Only %d signal edges detected\n", + "Only %d signal edges detected\n", dht11->num_edges); ret = -ETIMEDOUT; } @@ -206,7 +207,7 @@ static int dht11_read_raw(struct iio_dev *iio_dev, goto err; ret = dht11_decode(dht11, - dht11->num_edges == DHT11_EDGES_PER_READ ? + dht11->num_edges == DHT11_EDGES_PER_READ ? DHT11_EDGES_PREAMBLE : DHT11_EDGES_PREAMBLE - 2); if (ret) |