[PATCH 36/40] iio: adc: ti_am335x_adc: Add the scale information
From: Miquel Raynal <miquel.raynal@bootlin.com>
Date: 2021-08-25 15:35:07
Also in:
linux-devicetree, linux-iio, linux-input, linux-omap
Subsystem:
iio subsystem and drivers, the rest · Maintainers:
Jonathan Cameron, Linus Torvalds
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> --- drivers/iio/adc/ti_am335x_adc.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index d4619fd6fd54..f644898b47dd 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;
--
2.27.0