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charset="UTF-8" Content-Transfer-Encoding: 8bit X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-ORIG-GUID: 4P1jzgQxKGkpBfwsoyYRdq2ymJtB4xXG X-Authority-Analysis: v=2.4 cv=cdjSrmDM c=1 sm=1 tr=0 ts=67f66770 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=XR8D0OoHHMoA:10 a=gAnH3GRIAAAA:8 a=o3DtMFfdRpqB0q9FUmIA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: 4P1jzgQxKGkpBfwsoyYRdq2ymJtB4xXG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-09_04,2025-04-08_04,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 malwarescore=0 priorityscore=1501 adultscore=0 mlxscore=0 clxscore=1015 mlxlogscore=999 phishscore=0 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504090073 The AD4170 has an internal temperature sensor that can be read using the ADC. Whenever possible, configure an IIO channel to provide the chip's temperature. Signed-off-by: Marcelo Schmitt --- drivers/iio/adc/ad4170.c | 72 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 69 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/ad4170.c b/drivers/iio/adc/ad4170.c index b382e7f3dbe0..d204f8ca840f 100644 --- a/drivers/iio/adc/ad4170.c +++ b/drivers/iio/adc/ad4170.c @@ -922,6 +922,27 @@ 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 @@ -1209,9 +1230,27 @@ static int ad4170_read_raw(struct iio_dev *indio_dev, return ret; case IIO_CHAN_INFO_SCALE: pga = FIELD_GET(AD4170_AFE_PGA_GAIN_MSK, setup->afe); - *val = chan_info->scale_tbl[pga][0]; - *val2 = chan_info->scale_tbl[pga][1]; - return IIO_VAL_INT_PLUS_NANO; + switch (chan->type) { + case IIO_VOLTAGE: + *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; /* The scale integer part is always 0. */ + *val2 = DIV_ROUND_CLOSEST(chan_info->scale_tbl[pga][1] * MILLI, + 477) * MILLI; + return IIO_VAL_INT_PLUS_NANO; + default: + return -EINVAL; + } case IIO_CHAN_INFO_OFFSET: pga = FIELD_GET(AD4170_AFE_PGA_GAIN_MSK, setup->afe); *val = chan_info->offset_tbl[pga]; @@ -1855,12 +1894,39 @@ static int ad4170_parse_channels(struct iio_dev *indio_dev) if (num_channels > AD4170_MAX_CHANNELS) return dev_err_probe(dev, -EINVAL, "Too many channels\n"); + /* Add one for temperature */ + num_channels = min(num_channels + 1, AD4170_MAX_CHANNELS); + device_for_each_child_node_scoped(dev, child) { ret = ad4170_parse_channel_node(indio_dev, child, chan_num++); if (ret) return ret; } + /* + * Add internal temperature sensor channel if the maximum number of + * channels has not been reached. + */ + if (num_channels < AD4170_MAX_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; + } indio_dev->num_channels = num_channels; indio_dev->channels = st->chans; return 0; -- 2.47.2