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Wed, 4 Feb 2026 07:33:00 -0500 From: Jonathan Santos To: , CC: Jonathan Santos , , , , , , Subject: [PATCH 2/3] iio: adc: ad7768-1: prevent one-shot mode with wideband filter Date: Sat, 31 Jan 2026 22:35:29 -0300 Message-ID: X-Mailer: git-send-email 2.34.1 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-Transfer-Encoding: quoted-printable X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: X-uuf4-VoyZfQ9pnzN_SxBKZycPq1odJ X-Proofpoint-ORIG-GUID: X-uuf4-VoyZfQ9pnzN_SxBKZycPq1odJ X-Authority-Analysis: v=2.4 cv=OrdCCi/t c=1 sm=1 tr=0 ts=69833c86 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=gAnH3GRIAAAA:8 a=-hccp5cQjjF6FW3WzvAA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjA0MDA5NCBTYWx0ZWRfX1T7etph2YHok 1IQVlI7Pw8z3nQAXanaHrCmDjC+RxPr3j2nBXKxcnNRpvGSwBYgyGARHny+ZPEpfGW/aG/q8UaK sMgzO2ebLTsfcSsj9MSYsvXBomjUofg7PRVkRwBxp1Fo0xvD2DtmDk/kof8m4P++33oD9VLAkJ2 oqh9/7IJxfENcKP9xlouVErG57EK+VjF/vwbgfGbTRmIfsCA/Hf8/5xLxVDeBad1TWYwFFc1Q49 KBzzRR/owVAh+4Q/0LZMk+k/PMcYP9MXY8hPyouvc0C6C4ZYkRH0rZsp8savZiuZBGDx8BWe7F5 9PVZCDVm/f+LSXASH02Et7F5d2wToKNgshlKFB1NcQFpc0t8ir8C8xr9gyRr8ySWMmajNWTGcky 7aBjPQBNSPZIs/85s9oe7rktwbh8TmaQbsb3AqrrmZoXJjAQ8cQwk7fp/NenClb25SpGEO66jjg Ykc3dYnmeQ9T4ek3AVA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-04_03,2026-02-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 suspectscore=0 phishscore=0 impostorscore=0 malwarescore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602040094 Content-Type: text/plain; charset="utf-8" The AD7768-1 datasheet specifies that the wideband low ripple FIR filter is only available in continuous conversion mode and should not be used with one-shot mode to avoid malfunction and incorrect data. Add filter type checks in ad7768_scan_direct() to skip one-shot mode switching when wideband filter is configured. Signed-off-by: Jonathan Santos --- drivers/iio/adc/ad7768-1.c | 25 +++++++++++++++---------- 1 file changed, 15 insertions(+), 10 deletions(-) diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c index 8d39b71703ae..374614ea97ac 100644 --- a/drivers/iio/adc/ad7768-1.c +++ b/drivers/iio/adc/ad7768-1.c @@ -463,14 +463,17 @@ static int ad7768_scan_direct(struct iio_dev *indio_d= ev) struct ad7768_state *st =3D iio_priv(indio_dev); int readval, ret; =20 - ret =3D ad7768_set_mode(st, AD7768_ONE_SHOT); - if (ret < 0) - return ret; + /* Wideband filter is not available in One-Shot conversion mode */ + if (st->filter_type !=3D AD7768_FILTER_WIDEBAND) { + ret =3D ad7768_set_mode(st, AD7768_ONE_SHOT); + if (ret < 0) + return ret; =20 - /* One-shot mode requires a SYNC pulse to generate a new sample */ - ret =3D ad7768_send_sync_pulse(st); - if (ret) - return ret; + /* One-shot mode requires a SYNC pulse to generate a new sample */ + ret =3D ad7768_send_sync_pulse(st); + if (ret) + return ret; + } =20 reinit_completion(&st->completion); =20 @@ -496,9 +499,11 @@ static int ad7768_scan_direct(struct iio_dev *indio_de= v) * Any SPI configuration of the AD7768-1 can only be * performed in continuous conversion mode. */ - ret =3D ad7768_set_mode(st, AD7768_CONTINUOUS); - if (ret < 0) - return ret; + if (st->filter_type !=3D AD7768_FILTER_WIDEBAND) { + ret =3D ad7768_set_mode(st, AD7768_CONTINUOUS); + if (ret < 0) + return ret; + } =20 return readval; } --=20 2.34.1