AINCOM should actually be a supply. If present and it has a non-zero voltage, the pseudo-differential channels are configured as single-ended with an offset. Otherwise, they are configured as differential channels between AINx and AINCOM pins. Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx> --- drivers/iio/adc/ad7192.c | 53 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 49 insertions(+), 4 deletions(-) diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c index ac737221beae..a9eb4fab39ca 100644 --- a/drivers/iio/adc/ad7192.c +++ b/drivers/iio/adc/ad7192.c @@ -175,7 +175,7 @@ enum { struct ad7192_chip_info { unsigned int chip_id; const char *name; - const struct iio_chan_spec *channels; + struct iio_chan_spec *channels; u8 num_channels; const struct iio_info *info; }; @@ -186,6 +186,7 @@ struct ad7192_state { struct regulator *vref; struct clk *mclk; u16 int_vref_mv; + u16 aincom_mv; u32 fclk; u32 mode; u32 conf; @@ -745,6 +746,9 @@ static int ad7192_read_raw(struct iio_dev *indio_dev, /* Kelvin to Celsius */ if (chan->type == IIO_TEMP) *val -= 273 * ad7192_get_temp_scale(unipolar); + else if (st->aincom_mv && chan->channel2 == -1) + *val += DIV_ROUND_CLOSEST_ULL((u64)st->aincom_mv * 1000000000, + st->scale_avail[gain][1]); return IIO_VAL_INT; case IIO_CHAN_INFO_SAMP_FREQ: *val = DIV_ROUND_CLOSEST(ad7192_get_f_adc(st), 1024); @@ -982,7 +986,7 @@ static const struct iio_info ad7195_info = { #define AD7193_CHANNEL(_si, _channel1, _address) \ AD7193_DIFF_CHANNEL(_si, _channel1, -1, _address) -static const struct iio_chan_spec ad7192_channels[] = { +static struct iio_chan_spec ad7192_channels[] = { AD719x_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M), AD719x_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M), AD719x_TEMP_CHANNEL(2, AD7192_CH_TEMP), @@ -994,7 +998,7 @@ static const struct iio_chan_spec ad7192_channels[] = { IIO_CHAN_SOFT_TIMESTAMP(8), }; -static const struct iio_chan_spec ad7193_channels[] = { +static struct iio_chan_spec ad7193_channels[] = { AD7193_DIFF_CHANNEL(0, 1, 2, AD7193_CH_AIN1P_AIN2M), AD7193_DIFF_CHANNEL(1, 3, 4, AD7193_CH_AIN3P_AIN4M), AD7193_DIFF_CHANNEL(2, 5, 6, AD7193_CH_AIN5P_AIN6M), @@ -1048,11 +1052,27 @@ static void ad7192_reg_disable(void *reg) regulator_disable(reg); } +static int ad7192_config_channels(struct ad7192_state *st) +{ + struct iio_chan_spec *channels = st->chip_info->channels; + int i; + + if (!st->aincom_mv) + for (i = 0; i < st->chip_info->num_channels; i++) + if (channels[i].channel2 == -1) { + channels[i].differential = 1; + channels[i].channel2 = 0; + } + + return 0; +} + static int ad7192_probe(struct spi_device *spi) { struct ad7192_state *st; struct iio_dev *indio_dev; - int ret; + struct regulator *aincom; + int ret = 0; if (!spi->irq) { dev_err(&spi->dev, "no IRQ?\n"); @@ -1067,6 +1087,26 @@ static int ad7192_probe(struct spi_device *spi) mutex_init(&st->lock); + aincom = devm_regulator_get_optional(&spi->dev, "aincom"); + if (!IS_ERR(aincom)) { + ret = regulator_enable(aincom); + if (ret) { + dev_err(&spi->dev, "Failed to enable specified AINCOM supply\n"); + return ret; + } + + 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 / 1000; + st->avdd = devm_regulator_get(&spi->dev, "avdd"); if (IS_ERR(st->avdd)) return PTR_ERR(st->avdd); @@ -1113,6 +1153,11 @@ static int ad7192_probe(struct spi_device *spi) st->int_vref_mv = ret / 1000; st->chip_info = spi_get_device_match_data(spi); + + ret = ad7192_config_channels(st); + if (ret) + return ret; + indio_dev->name = st->chip_info->name; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = st->chip_info->channels; -- 2.34.1