[PATCH 2/4] staging: iio: ad7150: use FIELD_GET and GENMASK

Melissa Wen melissa.srw at gmail.com
Fri May 3 22:14:33 UTC 2019


Use the bitfield macro FIELD_GET, and GENMASK to do the shift and mask in
one go. This makes the code more readable than explicit masking followed
by a shift.

Signed-off-by: Melissa Wen <melissa.srw at gmail.com>
---
 drivers/staging/iio/cdc/ad7150.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/iio/cdc/ad7150.c b/drivers/staging/iio/cdc/ad7150.c
index 24601ba7db88..4ba46fb6ac02 100644
--- a/drivers/staging/iio/cdc/ad7150.c
+++ b/drivers/staging/iio/cdc/ad7150.c
@@ -5,6 +5,7 @@
  * Copyright 2010-2011 Analog Devices Inc.
  */
 
+#include <linux/bitfield.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
@@ -44,6 +45,9 @@
 #define AD7150_SN0_REG				0x16
 #define AD7150_ID_REG				0x17
 
+/* AD7150 masks */
+#define AD7150_THRESHTYPE_MSK			GENMASK(6, 5)
+
 /**
  * struct ad7150_chip_info - instance specific chip data
  * @client: i2c client for this device
@@ -136,7 +140,7 @@ static int ad7150_read_event_config(struct iio_dev *indio_dev,
 	if (ret < 0)
 		return ret;
 
-	threshtype = (ret >> 5) & 0x03;
+	threshtype = FIELD_GET(AD7150_THRESHTYPE_MSK, ret);
 	adaptive = !!(ret & 0x80);
 
 	switch (type) {
-- 
2.20.1



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