From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
The supply voltage is attenuated by 6 before being fed to the ADC.
Handle this explcitly rather than premultiplying the _raw value by 6.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
drivers/staging/iio/cdc/ad7746.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)
diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
index 9208fb179240..df12fdb20662 100644
--- a/drivers/staging/iio/cdc/ad7746.c
+++ b/drivers/staging/iio/cdc/ad7746.c
@@ -114,9 +114,8 @@ static const struct iio_chan_spec ad7746_channels[] = {
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 0,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
- BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),
.address = AD7746_REG_VT_DATA_HIGH << 8 |
AD7746_VTSETUP_VTMD_EXT_VIN,
},
@@ -125,9 +124,8 @@ static const struct iio_chan_spec ad7746_channels[] = {
.indexed = 1,
.channel = 1,
.extend_name = "supply",
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
- BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),
.address = AD7746_REG_VT_DATA_HIGH << 8 |
AD7746_VTSETUP_VTMD_VDD_MON,
},
@@ -560,10 +558,6 @@ static int ad7746_read_raw(struct iio_dev *indio_dev,
*/
*val = (*val * 125) / 256;
break;
- case IIO_VOLTAGE:
- if (chan->channel == 1) /* supply_raw*/
- *val = *val * 6;
- break;
default:
break;
}
@@ -618,6 +612,8 @@ static int ad7746_read_raw(struct iio_dev *indio_dev,
case IIO_VOLTAGE:
/* 1170mV / 2^23 */
*val = 1170;
+ if (chan->channel == 1)
+ *val *= 6;
*val2 = 23;
ret = IIO_VAL_FRACTIONAL_LOG2;
break;
--
2.36.1
