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Mon, 7 Jul 2025 09:54:12 -0400 From: Marcelo Schmitt To: , , , CC: , , , , , , , , , , , , , , Subject: [PATCH v8 11/12] iio: adc: ad4170-4: Add support for internal temperature sensor Date: Mon, 7 Jul 2025 10:54:09 -0300 Message-ID: <71ac994060cf79a6c49f39b0c7d04c6c9cbbab00.1751895245.git.marcelo.schmitt@analog.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ADIRuleOP-NewSCL: Rule Triggered X-Authority-Analysis: v=2.4 cv=AP9nYgXq c=1 sm=1 tr=0 ts=686bd195 cx=c_pps a=PpDZqlmH/M8setHirZLBMw==:117 a=PpDZqlmH/M8setHirZLBMw==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=gAnH3GRIAAAA:8 a=o3DtMFfdRpqB0q9FUmIA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzA3MDA4MSBTYWx0ZWRfX3YfE0BWE80k+ 5Y/wAYpgia+ccGSGt4Nuh0H5I6DT68dChjC++5J7GUj/U4+HUt9CP8jzI/nd3rDBtpSIXvXbQmf AffTDor8iS43vw24q5oHXBq+wQ5d0/kqy/5FVBCRJT5NpCFhVZwlfTVFKMlvt9NJwe7z+lVAdBl p9OpqXOdCqlU+t83MvMt4mlkPGQhzzcFGDFpEwa/r7zZvJn7WrKsLXjvHZDzvSliz433akO9dYi M/7ABcZtBOI0hJjizNK9qHiq1qbNKWUNQSS2phC0hSpY/nHNhNOZ/9my8KGj+//ZyfN3w7RhOw3 GgRrjPHhBr+2xGEgk4CJMI9nYlZGP1yv1wvD3A2IUhIjVEa0VWuw/AxXvLNfXqKelAc5A2iCz3Q vhTdoAoe0JLs0RwNkWdHajNNuKi3m5Qb3anpOWIdLu0VmzeyyyDYS0QFcYlkMLx/SAPG3M1o X-Proofpoint-ORIG-GUID: YF3jiuLuJtYhWSN7dkevxHbeJVHlOkOt X-Proofpoint-GUID: YF3jiuLuJtYhWSN7dkevxHbeJVHlOkOt X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-07_03,2025-07-07_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=999 mlxscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 impostorscore=0 malwarescore=0 adultscore=0 spamscore=0 phishscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507070081 The AD4170-4 has an internal temperature sensor that can be read using the ADC. Whenever possible, configure an IIO channel to provide the chip's temperature. Reviewed-by: Nuno Sá Signed-off-by: Marcelo Schmitt --- Change log v7 -> v8 - Reduced number of line removals in code diff. drivers/iio/adc/ad4170-4.c | 62 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) 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); -- 2.47.2