By default the driver was always setting the RANGE bit which means that
the analog input goes from 0 to VREF. However, we might want to have 0
to 2xVREF. This change adds a new FW property to allow for the range
selection while keeping the default behavior if nothing is provided.
Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
---
drivers/iio/adc/ad7923.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
index 910cf05e75cd..4bd0ae209d18 100644
--- a/drivers/iio/adc/ad7923.c
+++ b/drivers/iio/adc/ad7923.c
@@ -6,8 +6,10 @@
* Copyright 2012 CS Systemes d'Information
*/
+#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/kernel.h>
+#include <linux/property.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
@@ -45,6 +47,8 @@
/* val = value, dec = left shift, bits = number of bits of the mask */
#define EXTRACT(val, dec, bits) (((val) >> (dec)) & ((1 << (bits)) - 1))
+#define AD7923_RANGE_0_VREF 1
+
struct ad7923_state {
struct spi_device *spi;
struct spi_transfer ring_xfer[5];
@@ -300,6 +304,7 @@ static void ad7923_regulator_disable(void *data)
static int ad7923_probe(struct spi_device *spi)
{
+ u32 ad7923_range = FIELD_PREP(AD7923_RANGE, AD7923_RANGE_0_VREF), val;
struct ad7923_state *st;
struct iio_dev *indio_dev;
const struct ad7923_chip_info *info;
@@ -311,8 +316,17 @@ static int ad7923_probe(struct spi_device *spi)
st = iio_priv(indio_dev);
+ ret = device_property_read_u32(&spi->dev, "adi,range-select", &val);
+ if (!ret) {
+ if (val > AD7923_RANGE_0_VREF)
+ return dev_err_probe(&spi->dev, -EINVAL,
+ "Invalid range (%u) selected\n", val);
+
+ ad7923_range = FIELD_PREP(AD7923_RANGE, val);
+ }
+
st->spi = spi;
- st->settings = AD7923_CODING | AD7923_RANGE |
+ st->settings = AD7923_CODING | ad7923_range |
AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS);
info = &ad7923_chip_info[spi_get_device_id(spi)->driver_data];
--
2.37.3
