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iio: adc: ad7192: Add aincom supply

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AINCOM should actually be a supply. AINx inputs are referenced to AINCOM
in pseudo-differential operation mode. AINCOM voltage represents the
offset of corresponding channels.

Signed-off-by: Alisa-Dariana Roman <alisa.roman@analog.com>
Link: https://lore.kernel.org/r/20240514120222.56488-4-alisa.roman@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alisa-Dariana Roman 2024-05-14 15:02:19 +03:00 committed by Jonathan Cameron
parent ecec83a236
commit 2b12a52b29
1 changed files with 48 additions and 2 deletions
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50
drivers/iio/adc/ad7192.c
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@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/units.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@ -186,6 +187,7 @@ struct ad7192_state {
struct regulator *vref;
struct clk *mclk;
u16 int_vref_mv;
u32 aincom_mv;
u32 fclk;
u32 mode;
u32 conf;
@ -742,10 +744,24 @@ static int ad7192_read_raw(struct iio_dev *indio_dev,
*val = -(1 << (chan->scan_type.realbits - 1));
else
*val = 0;
switch (chan->type) {
case IIO_VOLTAGE:
/*
* Only applies to pseudo-differential inputs.
* AINCOM voltage has to be converted to "raw" units.
*/
if (st->aincom_mv && !chan->differential)
*val += DIV_ROUND_CLOSEST_ULL((u64)st->aincom_mv * NANO,
st->scale_avail[gain][1]);
return IIO_VAL_INT;
/* Kelvin to Celsius */
if (chan->type == IIO_TEMP)
case IIO_TEMP:
*val -= 273 * ad7192_get_temp_scale(unipolar);
return IIO_VAL_INT;
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SAMP_FREQ:
*val = DIV_ROUND_CLOSEST(ad7192_get_f_adc(st), 1024);
return IIO_VAL_INT;
@ -1052,6 +1068,7 @@ static int ad7192_probe(struct spi_device *spi)
{
struct ad7192_state *st;
struct iio_dev *indio_dev;
struct regulator *aincom;
int ret;
if (!spi->irq) {
@ -1067,6 +1084,35 @@ static int ad7192_probe(struct spi_device *spi)
mutex_init(&st->lock);
/*
* Regulator aincom is optional to maintain compatibility with older DT.
* Newer firmware should provide a zero volt fixed supply if wired to
* ground.
*/
aincom = devm_regulator_get_optional(&spi->dev, "aincom");
if (IS_ERR(aincom)) {
if (PTR_ERR(aincom) != -ENODEV)
return dev_err_probe(&spi->dev, PTR_ERR(aincom),
"Failed to get AINCOM supply\n");
st->aincom_mv = 0;
} else {
ret = regulator_enable(aincom);
if (ret)
return dev_err_probe(&spi->dev, ret,
"Failed to enable specified AINCOM supply\n");
ret = devm_add_action_or_reset(&spi->dev, ad7192_reg_disable, aincom);
if (ret)
return ret;
ret = regulator_get_voltage(aincom);
if (ret < 0)
return dev_err_probe(&spi->dev, ret,
"Device tree error, AINCOM voltage undefined\n");
st->aincom_mv = ret / MILLI;
}
st->avdd = devm_regulator_get(&spi->dev, "avdd");
if (IS_ERR(st->avdd))
return PTR_ERR(st->avdd);