linux-kernel - [PATCH v2] staging: comedi: amplc_pci224: Convert macro GAT

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Message-ID: <20170312153329.GA20729@singhal-Inspiron-5558>
Date:   Sun, 12 Mar 2017 21:03:30 +0530
From:   simran singhal <singhalsimran0@...il.com>
To:     abbotti@....co.uk
Cc:     hsweeten@...ionengravers.com, gregkh@...uxfoundation.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: [PATCH v2] staging: comedi: amplc_pci224: Convert macro GAT_CONFIG
 to static inline function

Convert macro GAT_CONFIG to static inline function as static inline
functions are preferred over macros. This change is possible since the
arguments at all call sites have the same type.

This was done using Coccinelle:

@r@
expression e;
@@
- #define GAT_CONFIG(chan, src) e
+ static inline unsigned int pci224_gat_config(unsigned int chan,
+                                              unsigned int src)
+{
+       return ((chan & 3) << 3) | (src & 7);
+}

@r1@
expression dev,reg,chan,src;
@@
-GAT_CONFIG(chan, src)
+pci224_gat_config(chan, src)

Also, the comment describing the macro has been removed manually.

Signed-off-by: simran singhal <singhalsimran0@...il.com>
---

 v2:
   -Change the name of static inline function
   -put some code from 2 line to 1 line

 drivers/staging/comedi/drivers/amplc_pci224.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/comedi/drivers/amplc_pci224.c b/drivers/staging/comedi/drivers/amplc_pci224.c
index 2e6decf..07555cf 100644
--- a/drivers/staging/comedi/drivers/amplc_pci224.c
+++ b/drivers/staging/comedi/drivers/amplc_pci224.c
@@ -216,8 +216,12 @@
 #define GAT_GND		1	/* GND (i.e. disabled) */
 #define GAT_EXT		2	/* reserved (external gate input) */
 #define GAT_NOUTNM2	3	/* inverted output of channel-2 modulo total */
-/* Macro to construct gate input configuration register value. */
-#define GAT_CONFIG(chan, src)	((((chan) & 3) << 3) | ((src) & 7))
+
+static inline unsigned int pci224_gat_config(unsigned int chan,
+					     unsigned int src)
+{
+	return ((chan & 3) << 3) | (src & 7);
+}
 
 /*
  * Summary of CLK_OUTNM1 and GAT_NOUTNM2 connections for PCI224 and PCI234:
@@ -817,10 +821,10 @@ static void pci224_ao_start_pacer(struct comedi_device *dev,
 	 * source.
 	 */
 	/* Make sure Z2-0 is gated on.  */
-	outb(GAT_CONFIG(0, GAT_VCC), devpriv->iobase1 + PCI224_ZGAT_SCE);
+	outb(pci224_gat_config(0, GAT_VCC), devpriv->iobase1 + PCI224_ZGAT_SCE);
 	/* Cascading with Z2-2. */
 	/* Make sure Z2-2 is gated on.  */
-	outb(GAT_CONFIG(2, GAT_VCC), devpriv->iobase1 + PCI224_ZGAT_SCE);
+	outb(pci224_gat_config(2, GAT_VCC), devpriv->iobase1 + PCI224_ZGAT_SCE);
 	/* Z2-2 needs 10 MHz clock. */
 	outb(CLK_CONFIG(2, CLK_10MHZ), devpriv->iobase1 + PCI224_ZCLK_SCE);
 	/* Z2-0 is clocked from Z2-2's output. */
-- 
2.7.4