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Tue, 28 Apr 2026 01:54:21 -0700 (PDT) Received: from localhost.localdomain ([196.235.239.18]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4463fa89140sm4634632f8f.27.2026.04.28.01.54.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Apr 2026 01:54:21 -0700 (PDT) From: Salah Triki To: Marcelo Schmitt , Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Salah Triki Subject: [PATCH] iio: temperature: max30208: fix wrong scale value Date: Tue, 28 Apr 2026 09:54:15 +0100 Message-ID: <20260428085415.52858-1-salah.triki@gmail.com> X-Mailer: git-send-email 2.43.0 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 The driver currently returns a scale of 5 for IIO_CHAN_INFO_SCALE, which leads to incorrect temperature readings. According to the MAX30208 datasheet, the temperature resolution is 0.005°C per LSB. Using IIO_VAL_FRACTIONAL with 5/1000 correctly represents this 16-bit resolution. Fix the scale value to ensure user space tools report the temperature correctly in Celsius. Fixes: 9ee95ae4cffd ("iio: temperature: Add driver support for Maxim MAX30208") Signed-off-by: Salah Triki --- drivers/iio/temperature/max30208.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iio/temperature/max30208.c b/drivers/iio/temperature/max30208.c index 720469f9dc36..96f63c4fb2b6 100644 --- a/drivers/iio/temperature/max30208.c +++ b/drivers/iio/temperature/max30208.c @@ -163,7 +163,8 @@ static int max30208_read(struct iio_dev *indio_dev, case IIO_CHAN_INFO_SCALE: *val = 5; - return IIO_VAL_INT; + *val2 = 1000; + return IIO_VAL_FRACTIONAL; default: return -EINVAL; -- 2.43.0