The function ntc_adc_iio_read was using iio_read_channel_raw and
converting to microVolts using the assumption of a 12 bit ADC. If a
converter with different precision was used, the result was in error.
Instead, use iio_read_channel_processed, which does the conversion to
microVolts itself.
Signed-off-by: Chris Lesiak <chris.lesiak@xxxxxxxxx>
---
drivers/hwmon/ntc_thermistor.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c
index 6880011..0d3a686 100644
--- a/drivers/hwmon/ntc_thermistor.c
+++ b/drivers/hwmon/ntc_thermistor.c
@@ -190,20 +190,15 @@ struct ntc_data {
static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
{
struct iio_channel *channel = pdata->chan;
- s64 result;
int val, ret;
- ret = iio_read_channel_raw(channel, &val);
+ ret = iio_read_channel_processed(channel, &val);
if (ret < 0) {
pr_err("read channel() error: %d\n", ret);
return ret;
}
- /* unit: mV */
- result = pdata->pullup_uv * (s64) val;
- result >>= 12;
-
- return (int)result;
+ return val;
}
static const struct of_device_id ntc_match[] = {
--
1.9.3
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