linux-kernel - [PATCH 5/6] Staging: iio: impedance-analyzer: Prefer using the BIT macro

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Date:	Thu, 10 Sep 2015 09:43:53 +0530
From:	Shraddha Barke <shraddha.6596@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@...nel.org>,
	Peter Meerwald <pmeerw@...erw.net>,
	Hartmut Knaack <knaack.h@....de>, linux-kernel@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Cc:	Shraddha Barke <shraddha.6596@...il.com>
Subject: [PATCH 5/6] Staging: iio: impedance-analyzer: Prefer using the BIT macro

This patch replaces bit shifting on 1 with the BIT(x) macro
as it's extensively used by other function in this driver.

This was done with coccinelle:
@@ int g; @@

-(1 << g)
+BIT(g)

Signed-off-by: Shraddha Barke <shraddha.6596@...il.com>
---
 drivers/staging/iio/impedance-analyzer/ad5933.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
index c18109c..48acad0 100644
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -39,7 +39,7 @@
 #define AD5933_REG_IMAG_DATA		0x96	/* R, 2 bytes*/
 
 /* AD5933_REG_CONTROL_HB Bits */
-#define AD5933_CTRL_INIT_START_FREQ	(0x1 << 4)
+#define AD5933_CTRL_INIT_START_FREQ	BIT(4)
 #define AD5933_CTRL_START_SWEEP		(0x2 << 4)
 #define AD5933_CTRL_INC_FREQ		(0x3 << 4)
 #define AD5933_CTRL_REPEAT_FREQ		(0x4 << 4)
@@ -48,23 +48,23 @@
 #define AD5933_CTRL_STANDBY		(0xB << 4)
 
 #define AD5933_CTRL_RANGE_2000mVpp	(0x0 << 1)
-#define AD5933_CTRL_RANGE_200mVpp	(0x1 << 1)
+#define AD5933_CTRL_RANGE_200mVpp	BIT(1)
 #define AD5933_CTRL_RANGE_400mVpp	(0x2 << 1)
 #define AD5933_CTRL_RANGE_1000mVpp	(0x3 << 1)
 #define AD5933_CTRL_RANGE(x)		((x) << 1)
 
-#define AD5933_CTRL_PGA_GAIN_1		(0x1 << 0)
+#define AD5933_CTRL_PGA_GAIN_1		BIT(0)
 #define AD5933_CTRL_PGA_GAIN_5		(0x0 << 0)
 
 /* AD5933_REG_CONTROL_LB Bits */
-#define AD5933_CTRL_RESET		(0x1 << 4)
+#define AD5933_CTRL_RESET		BIT(4)
 #define AD5933_CTRL_INT_SYSCLK		(0x0 << 3)
-#define AD5933_CTRL_EXT_SYSCLK		(0x1 << 3)
+#define AD5933_CTRL_EXT_SYSCLK		BIT(3)
 
 /* AD5933_REG_STATUS Bits */
-#define AD5933_STAT_TEMP_VALID		(0x1 << 0)
-#define AD5933_STAT_DATA_VALID		(0x1 << 1)
-#define AD5933_STAT_SWEEP_DONE		(0x1 << 2)
+#define AD5933_STAT_TEMP_VALID		BIT(0)
+#define AD5933_STAT_DATA_VALID		BIT(1)
+#define AD5933_STAT_SWEEP_DONE		BIT(2)
 
 /* I2C Block Commands */
 #define AD5933_I2C_BLOCK_WRITE		0xA0
@@ -222,7 +222,7 @@ static int ad5933_set_freq(struct ad5933_state *st,
 		u8 d8[4];
 	} dat;
 
-	freqreg = (u64) freq * (u64) (1 << 27);
+	freqreg = (u64) freq * (u64) BIT(27);
 	do_div(freqreg, st->mclk_hz / 4);
 
 	switch (reg) {
@@ -308,7 +308,7 @@ static ssize_t ad5933_show_frequency(struct device *dev,
 	freqreg = be32_to_cpu(dat.d32) & 0xFFFFFF;
 
 	freqreg = (u64) freqreg * (u64) (st->mclk_hz / 4);
-	do_div(freqreg, 1 << 27);
+	do_div(freqreg, BIT(27));
 
 	return sprintf(buf, "%d\n", (int) freqreg);
 }
@@ -437,7 +437,7 @@ static ssize_t ad5933_store(struct device *dev,
 
 		/* 2x, 4x handling, see datasheet */
 		if (val > 511)
-			val = (val >> 1) | (1 << 9);
+			val = (val >> 1) | BIT(9);
 		else if (val > 1022)
 			val = (val >> 2) | (3 << 9);
 
-- 
2.1.4

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