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Tue, 15 Sep 2026 15:12:07 -0400 From: Marcelo Schmitt To: , , , CC: , , , , , , , , , , Subject: [PATCH v2 01/15] iio: adc: ad4134: Sign extend sample data Date: Tue, 15 Sep 2026 16:11:59 -0300 Message-ID: <7083358e62e3edfeeba0201aefd8d3195ee951d0.1789494473.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-Transfer-Encoding: 8bit Content-Type: text/plain X-ADIRuleOP-NewSCL: Rule Triggered X-Authority-Analysis: v=2.4 cv=JekpPkKV c=1 sm=1 tr=0 ts=6aa99894 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=N--XFCr6TIEc_64PeIT2:22 a=gAnH3GRIAAAA:8 a=TOduCJ2NwqVHWOW4apYA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE1MDI4MCBTYWx0ZWRfX1diqo2UsveOF kTcn9gAmL2KjPNyNDdMKfLnwlVJljkXIDY3fYYqU2b9INF2ES3DPZMcKyfGQSmkZMFwHQcxTT+U sJEpkKBrO9XfAzoFTNYBWKCF53c/dh4ob38IqHQmBma6v/0uPDByA0vIwOk0Hg4HncBgwO2Rxfk 5NBl4SMxgUN2HDzI0pO0UW0GwOr4c6vbH5RIggQpV5RoYSTnnj+dxlOn07oxJsOT7DJzpAi15kx HG1TYLtj2y6NlQrwxs8NTtac0Y5reid2/RoGo6SoFZS3Mjuaa12eTyZnu09s5e68igc+eyFcLrh YopZmOnsBtoXxM8sPp8btieIOYjse7IfriyE5YsUiKCm9UdQe0xZgeLUMB9kyhjYwDnYvtKYdwT i/5yhHVvOFxRvJeaQJx2jDZczlcrXmkGj60+L7H6KXQhFi6Z9x46eED9ef5xxJQr6DEY/9YGlCv YIxRqVt3psFCy5DTMkg== X-Proofpoint-GUID: BiAI0m3T7Y7GHRzPngG8tZZxOfhKN53x X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE1MDI4MCBTYWx0ZWRfX4Bx/HFo1P7FF Btxy82nWFmovnF2WgLkW+KW9aLmTs/AI90nr3n5kj+We2Fizw/hplNN9eaDG0ct+IfbHGaQ5UjH 8PzzmDmZkt5zEPjDUK0g2Cy/zacj3HAwXz9sT0OC5kWo3wIdgaNE X-Proofpoint-ORIG-GUID: BiAI0m3T7Y7GHRzPngG8tZZxOfhKN53x X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-15_05,2026-09-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 adultscore=0 impostorscore=0 phishscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 suspectscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609150280 Sign extend ADC sample data for correct delivery of negative ADC input difference. Fixes: e0bc6d7e2584 ("iio: adc: Initial support for AD4134") Signed-off-by: Marcelo Schmitt --- New patch in v2. drivers/iio/adc/ad4134.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad4134.c b/drivers/iio/adc/ad4134.c index 0490218bb0e9..7d40c0521bb3 100644 --- a/drivers/iio/adc/ad4134.c +++ b/drivers/iio/adc/ad4134.c @@ -172,6 +172,7 @@ static int ad4134_data_read(struct ad4134_state *st, unsigned int reg, unsigned int *val) { unsigned int i; + u32 sample; int ret; /* @@ -196,8 +197,9 @@ static int ad4134_data_read(struct ad4134_state *st, unsigned int reg, * Clock out data from all channels to avoid that. */ if (i == AD4134_VREG_CH(reg)) - *val = get_unaligned_be24(st->rx_buf); + sample = get_unaligned_be24(st->rx_buf); } + *val = sign_extend32(sample, AD4134_CHAN_PRECISION_BITS - 1); return 0; } -- 2.53.0