[PATCH] iio: magnetometer: mmc35240: refactor volatile and writeable reg functions

["Bianca Costa Galvão" <biancalvao@gmail.com>]

From: Bianca Costa Galvão <biancagalvao@usp.br>

Refactor 'mmc35240_is_volatile_reg' and 'mmc35240_is_writeable_reg' as they
share similar logic, returning the inverse of each other.

Introduce a new helper function 'mmc35240_reg_check' to generalize this
behavior, which is then used by both 'mmc35240_is_volatile_reg' and
'mmc35240_is_writeable_reg'.

Signed-off-by: Bianca Costa Galvão <biancagalvao@usp.br>
Co-developed-by: Júlia Calixto Rosa <juliacalixtorosa@usp.br>
Signed-off-by: Júlia Calixto Rosa <juliacalixtorosa@usp.br>
---
 drivers/iio/magnetometer/mmc35240.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/iio/magnetometer/mmc35240.c b/drivers/iio/magnetometer/mmc35240.c
index e08a57cd6de2..07f58567e521 100644
--- a/drivers/iio/magnetometer/mmc35240.c
+++ b/drivers/iio/magnetometer/mmc35240.c
@@ -418,15 +418,14 @@ static const struct iio_info mmc35240_info = {
 	.attrs		= &mmc35240_attribute_group,
 };
 
+static bool mmc35240_reg_check(unsigned int reg)
+{
+	return reg == MMC35240_REG_CTRL0 || reg == MMC35240_REG_CTRL1;
+}
+
 static bool mmc35240_is_writeable_reg(struct device *dev, unsigned int reg)
 {
-	switch (reg) {
-	case MMC35240_REG_CTRL0:
-	case MMC35240_REG_CTRL1:
-		return true;
-	default:
-		return false;
-	}
+	return mmc35240_reg_check(reg);
 }
 
 static bool mmc35240_is_readable_reg(struct device *dev, unsigned int reg)
@@ -448,13 +447,7 @@ static bool mmc35240_is_readable_reg(struct device *dev, unsigned int reg)
 
 static bool mmc35240_is_volatile_reg(struct device *dev, unsigned int reg)
 {
-	switch (reg) {
-	case MMC35240_REG_CTRL0:
-	case MMC35240_REG_CTRL1:
-		return false;
-	default:
-		return true;
-	}
+	return !mmc35240_reg_check(reg);
 }
 
 static const struct reg_default mmc35240_reg_defaults[] = {
-- 
2.43.0