diff options
| author | Petre Rodan <petre.rodan@subdimension.ro> | 2024-02-11 09:56:36 +0200 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2024-02-19 19:32:22 +0000 |
| commit | df3186e829c33e3c577e00e8b3faa25763a44bb0 (patch) | |
| tree | ab3e9c4b9853d636a460a3f9b2e7da9b5bc2f9a2 | |
| parent | b0e42c9e932323d340d9ec000c2ee06610386a80 (diff) | |
| download | iio-df3186e829c33e3c577e00e8b3faa25763a44bb0.tar.gz | |
iio: pressure: hsc030pa add mandatory delay
Add a mandatory 2ms delay between consecutive chip reads.
A Technical Note pdf specifies that the measurement cycle in these
chips takes around 1.26ms. By adding this 2ms delay we make sure that
we never get stale measurements.
For more details, please see "Figure 1" in the pdf below:
https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/common/documents/sps-siot-sleep-mode-technical-note-008286-1-en-ciid-155793.pdf
Signed-off-by: Petre Rodan <petre.rodan@subdimension.ro>
Link: https://lore.kernel.org/r/20240211075645.28777-6-petre.rodan@subdimension.ro
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
| -rw-r--r-- | drivers/iio/pressure/hsc030pa.h | 1 | ||||
| -rw-r--r-- | drivers/iio/pressure/hsc030pa_i2c.c | 3 | ||||
| -rw-r--r-- | drivers/iio/pressure/hsc030pa_spi.c | 2 |
3 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iio/pressure/hsc030pa.h b/drivers/iio/pressure/hsc030pa.h index f1079a70799fa..56dc8e88194bc 100644 --- a/drivers/iio/pressure/hsc030pa.h +++ b/drivers/iio/pressure/hsc030pa.h @@ -13,6 +13,7 @@ #include <linux/iio/iio.h> #define HSC_REG_MEASUREMENT_RD_SIZE 4 +#define HSC_RESP_TIME_MS 2 struct device; diff --git a/drivers/iio/pressure/hsc030pa_i2c.c b/drivers/iio/pressure/hsc030pa_i2c.c index b5810bafef40f..b3fd230e71da1 100644 --- a/drivers/iio/pressure/hsc030pa_i2c.c +++ b/drivers/iio/pressure/hsc030pa_i2c.c @@ -8,6 +8,7 @@ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/common/documents/sps-siot-sleep-mode-technical-note-008286-1-en-ciid-155793.pdf */ +#include <linux/delay.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/i2c.h> @@ -25,6 +26,8 @@ static int hsc_i2c_recv(struct hsc_data *data) struct i2c_msg msg; int ret; + msleep_interruptible(HSC_RESP_TIME_MS); + msg.addr = client->addr; msg.flags = client->flags | I2C_M_RD; msg.len = HSC_REG_MEASUREMENT_RD_SIZE; diff --git a/drivers/iio/pressure/hsc030pa_spi.c b/drivers/iio/pressure/hsc030pa_spi.c index 8d3441f1dcf96..818fa63034545 100644 --- a/drivers/iio/pressure/hsc030pa_spi.c +++ b/drivers/iio/pressure/hsc030pa_spi.c @@ -8,6 +8,7 @@ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/common/documents/sps-siot-sleep-mode-technical-note-008286-1-en-ciid-155793.pdf */ +#include <linux/delay.h> #include <linux/device.h> #include <linux/mod_devicetable.h> #include <linux/module.h> @@ -28,6 +29,7 @@ static int hsc_spi_recv(struct hsc_data *data) .len = HSC_REG_MEASUREMENT_RD_SIZE, }; + msleep_interruptible(HSC_RESP_TIME_MS); return spi_sync_transfer(spi, &xfer, 1); } |