iio: accel: bma400: Replace bit shifts with FIELD_PREP() and FIELD_GET()

set_* functions involve left shift of param values into respective
register fields before writing to register. Similarly get_* functions
involve right shift to extract values from the respective bit fields.
Replace these explicit shifting statements with standard kernel style
macros FIELD_GET() and FIELD_PREP().

Signed-off-by: Akshay Jindal <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/accel/bma400.h

···
  */
 #define BMA400_ACC_CONFIG0_REG		0x19
 #define BMA400_ACC_CONFIG0_LP_OSR_MASK		GENMASK(6, 5)
-#define BMA400_LP_OSR_SHIFT		5
 
 #define BMA400_ACC_CONFIG1_REG		0x1a
 #define BMA400_ACC_CONFIG1_ODR_MASK		GENMASK(3, 0)
···
 #define BMA400_ACC_CONFIG1_ODR_MIN_WHOLE_HZ	25
 #define BMA400_ACC_CONFIG1_ODR_MIN_HZ		12
 #define BMA400_ACC_CONFIG1_NP_OSR_MASK		GENMASK(5, 4)
-#define BMA400_NP_OSR_SHIFT		4
 #define BMA400_ACC_CONFIG1_ACC_RANGE_MASK	GENMASK(7, 6)
-#define BMA400_ACC_RANGE_SHIFT		6
 
 #define BMA400_ACC_CONFIG2_REG      0x1b
 

drivers/iio/accel/bma400_core.c

···
 			return ret;
 		}
 
-		osr = (val & BMA400_ACC_CONFIG0_LP_OSR_MASK) >> BMA400_LP_OSR_SHIFT;
+		osr = FIELD_GET(BMA400_ACC_CONFIG0_LP_OSR_MASK, val);
 
 		data->oversampling_ratio = osr;
 		return 0;
···
 			return ret;
 		}
 
-		osr = (val & BMA400_ACC_CONFIG1_NP_OSR_MASK) >> BMA400_NP_OSR_SHIFT;
+		osr = FIELD_GET(BMA400_ACC_CONFIG1_NP_OSR_MASK, val);
 
 		data->oversampling_ratio = osr;
 		return 0;
···
 
 		ret = regmap_write(data->regmap, BMA400_ACC_CONFIG0_REG,
 				   (acc_config & ~BMA400_ACC_CONFIG0_LP_OSR_MASK) |
-				   (val << BMA400_LP_OSR_SHIFT));
+				   FIELD_PREP(BMA400_ACC_CONFIG0_LP_OSR_MASK, val));
 		if (ret) {
 			dev_err(data->dev, "Failed to write out OSR\n");
 			return ret;
···
 
 		ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG,
 				   (acc_config & ~BMA400_ACC_CONFIG1_NP_OSR_MASK) |
-				   (val << BMA400_NP_OSR_SHIFT));
+				   FIELD_PREP(BMA400_ACC_CONFIG1_NP_OSR_MASK, val));
 		if (ret) {
 			dev_err(data->dev, "Failed to write out OSR\n");
 			return ret;
···
 	if (ret)
 		return ret;
 
-	raw_scale = (val & BMA400_ACC_CONFIG1_ACC_RANGE_MASK) >> BMA400_ACC_RANGE_SHIFT;
+	raw_scale = FIELD_GET(BMA400_ACC_CONFIG1_ACC_RANGE_MASK, val);
 	if (raw_scale > BMA400_TWO_BITS_MASK)
 		return -EINVAL;
 
···
 
 	ret = regmap_write(data->regmap, BMA400_ACC_CONFIG1_REG,
 			   (acc_config & ~BMA400_ACC_CONFIG1_ACC_RANGE_MASK) |
-			   (raw << BMA400_ACC_RANGE_SHIFT));
+			   FIELD_PREP(BMA400_ACC_CONFIG1_ACC_RANGE_MASK, raw));
 	if (ret)
 		return ret;