From 3af9935499056a2af5b909b39cc0cbc358abaf7e Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Fri, 15 Oct 2021 10:15:02 +0200 Subject: [PATCH] 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 Acked-by: Jonathan Cameron Signed-off-by: Lee Jones Link: https://lore.kernel.org/r/20211015081506.933180-45-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 e7dba10b29b47..867690b6c2dd0 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; -- 2.30.2