From: Vidhu Sarwal <vidhu.linux@gmail.com>
Date: Sat, 4 Jul 2026 11:52:45 +0000 (+0530)
Subject: iio: light: al3010: fix incorrect scale for the highest gain range
X-Git-Tag: v7.2-rc3~3^2^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aa411adc6ce40ad1a55ebc965f255a4cfc0005f8;p=thirdparty%2Fkernel%2Fstable.git

iio: light: al3010: fix incorrect scale for the highest gain range

al3010_scales[] encodes the highest gain range as {0, 1187200}.
For IIO_VAL_INT_PLUS_MICRO, the fractional part must be less than
1000000, so the scale 1.1872 should instead be represented as
{ 1, 187200 }.

Since write_raw() compares the value from userspace against this
table, writing the advertised 1.1872 scale never matches the malformed
entry and returns -EINVAL. As a result, the highest gain range cannot
be selected. Reading the scale in that state also reports the malformed
value.

Fixes: c36b5195ab70 ("iio: light: add Dyna-Image AL3010 driver")
Signed-off-by: Vidhu Sarwal <vidhu.linux@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

diff --git a/drivers/iio/light/al3010.c b/drivers/iio/light/al3010.c
index d603b4a6b8e8..ca1d7fd6defb 100644
--- a/drivers/iio/light/al3010.c
+++ b/drivers/iio/light/al3010.c
@@ -42,7 +42,7 @@ enum al3xxxx_range {
 };
 
 static const int al3010_scales[][2] = {
-	{0, 1187200}, {0, 296800}, {0, 74200}, {0, 18600}
+	{ 1, 187200 }, { 0, 296800 }, { 0, 74200 }, { 0, 18600 },
 };
 
 static const struct regmap_config al3010_regmap_config = {