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authorMiquel Raynal <miquel.raynal@bootlin.com>2021-10-15 10:15:02 +0200
committerLee Jones <lee.jones@linaro.org>2021-10-21 10:24:01 +0200
commit3af9935499056a2af5b909b39cc0cbc358abaf7e (patch)
treef8ec984ef578de065da47579b5e1f22f996eb2bb /drivers/iio/adc/ti_am335x_adc.c
parentiio: adc: ti_am335x_adc: Add a unit to the timeout delay (diff)
downloadlinux-3af9935499056a2af5b909b39cc0cbc358abaf7e.tar.xz
linux-3af9935499056a2af5b909b39cc0cbc358abaf7e.zip
iio: adc: ti_am335x_adc: Add the scale information
Without the scale, the values returned to the user are just a picture of the input voltage against the full scale range of the ADC. We need to provide the actual conversion factor to get milli-Volts values. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20211015081506.933180-45-miquel.raynal@bootlin.com
Diffstat (limited to 'drivers/iio/adc/ti_am335x_adc.c')
-rw-r--r--drivers/iio/adc/ti_am335x_adc.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index e7dba10b29b4..867690b6c2dd 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -417,6 +417,7 @@ static int tiadc_channel_init(struct device *dev, struct iio_dev *indio_dev,
chan->indexed = 1;
chan->channel = adc_dev->channel_line[i];
chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
+ chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
chan->datasheet_name = chan_name_ain[chan->channel];
chan->scan_index = i;
chan->scan_type.sign = 'u';
@@ -441,6 +442,23 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
unsigned long timeout;
int ret;
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ *val = 1800;
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
if (iio_buffer_enabled(indio_dev))
return -EBUSY;