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From: Melissa Wen <melissa.srw@gmail.com>
To: Lars-Peter Clausen <lars@metafoo.de>,
	Michael Hennerich <Michael.Hennerich@analog.com>,
	Stefan Popa <stefan.popa@analog.com>,
	Jonathan Cameron <jic23@kernel.org>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Barry Song <21cnbao@gmail.com>
Cc: linux-iio@vger.kernel.org, devel@driverdev.osuosl.org,
	linux-kernel@vger.kernel.org, kernel-usp@googlegroups.com
Subject: [PATCH v2 1/3] staging: iio: ad7150: use FIELD_GET and GENMASK
Date: Fri, 14 Jun 2019 13:32:21 -0300
Message-ID: <4f88fd66e478289006353645d84b7af1b5aa345c.1560529045.git.melissa.srw@gmail.com> (raw)
In-Reply-To: <cover.1560529045.git.melissa.srw@gmail.com>

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@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 8234da4b8c65..091aa33589d7 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>
@@ -45,6 +46,9 @@
 #define AD7150_SN0                 22
 #define AD7150_ID                  23
 
+/* AD7150 masks */
+#define AD7150_THRESHTYPE_MSK			GENMASK(6, 5)
+
 /**
  * struct ad7150_chip_info - instance specific chip data
  * @client: i2c client for this device
@@ -137,7 +141,7 @@ 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


  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14 16:31 [PATCH v2 0/3] staging: iio: ad7150: improve driver readability Melissa Wen
2019-06-14 16:32 ` Melissa Wen [this message]
2019-06-16 10:18   ` [PATCH v2 1/3] staging: iio: ad7150: use FIELD_GET and GENMASK Jonathan Cameron
2019-06-14 16:32 ` [PATCH v2 2/3] staging: iio: ad7150: simplify i2c SMBus return treatment Melissa Wen
2019-06-16 10:20   ` Jonathan Cameron
2019-06-14 16:33 ` [PATCH v2 3/3] staging: iio: ad7150: clean up of comments Melissa Wen
2019-06-16 10:20   ` Jonathan Cameron

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