diff options
| -rw-r--r-- | drivers/iio/adc/ad4170-4.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/iio/adc/ad4170-4.c b/drivers/iio/adc/ad4170-4.c index 3153680c0a30..2a20868a1db7 100644 --- a/drivers/iio/adc/ad4170-4.c +++ b/drivers/iio/adc/ad4170-4.c @@ -874,6 +874,27 @@ static const struct iio_chan_spec ad4170_channel_template = { }, }; +static const struct iio_chan_spec ad4170_temp_channel_template = { + .type = IIO_TEMP, + .indexed = 0, + .channel = 17, + .channel2 = 17, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET) | + BIT(IIO_CHAN_INFO_CALIBSCALE) | + BIT(IIO_CHAN_INFO_CALIBBIAS) | + BIT(IIO_CHAN_INFO_SAMP_FREQ), + .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), + .scan_type = { + .sign = 's', + .realbits = 24, + .storagebits = 32, + .shift = 8, + .endianness = IIO_BE, + }, +}; + /* * Receives the number of a multiplexed AD4170 input (ain_n), and stores the * voltage (in µV) of the specified input into ain_voltage. If the input number @@ -1181,6 +1202,18 @@ static int ad4170_read_raw(struct iio_dev *indio_dev, *val = chan_info->scale_tbl[pga][0]; *val2 = chan_info->scale_tbl[pga][1]; return IIO_VAL_INT_PLUS_NANO; + case IIO_TEMP: + /* + * The scale_tbl converts output codes to mV units so + * multiply by MILLI to make the factor convert to µV. + * Then, apply the temperature sensor change sensitivity + * of 477 μV/K. Finally, multiply the result by MILLI + * again to comply with milli degrees Celsius IIO ABI. + */ + *val = 0; + *val2 = DIV_ROUND_CLOSEST(chan_info->scale_tbl[pga][1] * MILLI, 477) * + MILLI; + return IIO_VAL_INT_PLUS_NANO; default: return -EINVAL; } @@ -1859,6 +1892,9 @@ static int ad4170_parse_channels(struct iio_dev *indio_dev) if (num_channels > AD4170_MAX_ADC_CHANNELS) return dev_err_probe(dev, -EINVAL, "Too many channels\n"); + /* Add one for temperature */ + num_channels = min(num_channels + 1, AD4170_MAX_ADC_CHANNELS); + chan_num = 0; device_for_each_child_node_scoped(dev, child) { ret = ad4170_parse_channel_node(indio_dev, child, chan_num++); @@ -1866,6 +1902,32 @@ static int ad4170_parse_channels(struct iio_dev *indio_dev) return ret; } + /* + * Add internal temperature sensor channel if the maximum number of + * channels has not been reached. + */ + if (num_channels < AD4170_MAX_ADC_CHANNELS) { + struct ad4170_setup *setup = &st->chan_infos[chan_num].setup; + + st->chans[chan_num] = ad4170_temp_channel_template; + st->chans[chan_num].address = chan_num; + st->chans[chan_num].scan_index = chan_num; + + st->chan_infos[chan_num].setup_num = AD4170_INVALID_SETUP; + st->chan_infos[chan_num].initialized = true; + + setup->afe |= FIELD_PREP(AD4170_AFE_REF_SELECT_MSK, + AD4170_REF_AVDD); + + ret = ad4170_get_input_range(st, &st->chans[chan_num], chan_num, + AD4170_REF_AVDD); + if (ret < 0) + return dev_err_probe(dev, ret, "Invalid input config\n"); + + st->chan_infos[chan_num].input_range_uv = ret; + chan_num++; + } + /* Add timestamp channel */ struct iio_chan_spec ts_chan = IIO_CHAN_SOFT_TIMESTAMP(chan_num); |