linux-kernel - [PATCH 6/8 v2] staging: pi433: use defines for shifting register values

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Date:   Wed, 13 Dec 2017 17:55:14 +0100
From:   Valentin Vidic <Valentin.Vidic@...Net.hr>
To:     Marcus Wolf <marcus.wolf@...rthome-wolf.de>
Cc:     Simon Sandström <simon@...anor.nu>,
        Marcin Ciupak <marcin.s.ciupak@...il.com>,
        Marcus Wolf <linux@...f-entwicklungen.de>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Valentin Vidic <Valentin.Vidic@...Net.hr>
Subject: [PATCH 6/8 v2] staging: pi433: use defines for shifting register values

Avoid shifting by magic numbers and use defines instead.

Signed-off-by: Valentin Vidic <Valentin.Vidic@...Net.hr>
---
v2: - drop change for SHIFT_DATAMODUL_MODULATION_TYPE
    - move shifting to the header file

 drivers/staging/pi433/rf69.c           | 16 ++++++++--------
 drivers/staging/pi433/rf69_registers.h |  8 ++++++++
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/pi433/rf69.c b/drivers/staging/pi433/rf69.c
index f77ecd60f43a..ce259b4f0b0e 100644
--- a/drivers/staging/pi433/rf69.c
+++ b/drivers/staging/pi433/rf69.c
@@ -340,14 +340,14 @@ enum lnaGain rf69_get_lna_gain(struct spi_device *spi)
 
 	currentValue = rf69_read_reg(spi, REG_LNA);
 
-	switch (currentValue & MASK_LNA_CURRENT_GAIN >> 3) { // improvement: change 3 to define
-	case LNA_GAIN_AUTO:	    return automatic;
-	case LNA_GAIN_MAX:	    return max;
-	case LNA_GAIN_MAX_MINUS_6:  return maxMinus6;
-	case LNA_GAIN_MAX_MINUS_12: return maxMinus12;
-	case LNA_GAIN_MAX_MINUS_24: return maxMinus24;
-	case LNA_GAIN_MAX_MINUS_36: return maxMinus36;
-	case LNA_GAIN_MAX_MINUS_48: return maxMinus48;
+	switch (currentValue & MASK_LNA_CURRENT_GAIN) {
+	case LNA_GAIN_AUTO_SHIFTED:	    return automatic;
+	case LNA_GAIN_MAX_SHIFTED:	    return max;
+	case LNA_GAIN_MAX_MINUS_6_SHIFTED:  return maxMinus6;
+	case LNA_GAIN_MAX_MINUS_12_SHIFTED: return maxMinus12;
+	case LNA_GAIN_MAX_MINUS_24_SHIFTED: return maxMinus24;
+	case LNA_GAIN_MAX_MINUS_36_SHIFTED: return maxMinus36;
+	case LNA_GAIN_MAX_MINUS_48_SHIFTED: return maxMinus48;
 	default:		    return undefined;
 	}
 }
diff --git a/drivers/staging/pi433/rf69_registers.h b/drivers/staging/pi433/rf69_registers.h
index d23b8b668ef5..6329bbf9e499 100644
--- a/drivers/staging/pi433/rf69_registers.h
+++ b/drivers/staging/pi433/rf69_registers.h
@@ -237,6 +237,7 @@
 #define  MASK_LNA_ZIN				0x80
 #define  MASK_LNA_CURRENT_GAIN			0x38
 #define  MASK_LNA_GAIN				0x07
+#define  SHIFT_LNA_CURRENT_GAIN			3
 
 #define  LNA_GAIN_AUTO				0x00 /* default */
 #define  LNA_GAIN_MAX				0x01
@@ -246,6 +247,13 @@
 #define  LNA_GAIN_MAX_MINUS_36			0x05
 #define  LNA_GAIN_MAX_MINUS_48			0x06
 
+#define  LNA_GAIN_AUTO_SHIFTED			(LNA_GAIN_AUTO		<< SHIFT_LNA_CURRENT_GAIN)
+#define  LNA_GAIN_MAX_SHIFTED			(LNA_GAIN_MAX		<< SHIFT_LNA_CURRENT_GAIN)
+#define  LNA_GAIN_MAX_MINUS_6_SHIFTED		(LNA_GAIN_MAX_MINUS_6	<< SHIFT_LNA_CURRENT_GAIN)
+#define  LNA_GAIN_MAX_MINUS_12_SHIFTED		(LNA_GAIN_MAX_MINUS_12	<< SHIFT_LNA_CURRENT_GAIN)
+#define  LNA_GAIN_MAX_MINUS_24_SHIFTED		(LNA_GAIN_MAX_MINUS_24	<< SHIFT_LNA_CURRENT_GAIN)
+#define  LNA_GAIN_MAX_MINUS_36_SHIFTED		(LNA_GAIN_MAX_MINUS_36	<< SHIFT_LNA_CURRENT_GAIN)
+#define  LNA_GAIN_MAX_MINUS_48_SHIFTED		(LNA_GAIN_MAX_MINUS_48	<< SHIFT_LNA_CURRENT_GAIN)
 
 /* RegRxBw (0x19) and RegAfcBw (0x1A) */
 #define  MASK_BW_DCC_FREQ			0xE0
-- 
2.15.0