linux-kernel - [PATCH v3 1/3] lib: cordic: Move cordic macros and defines to header file

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Date:   Wed, 14 Nov 2018 20:27:50 +0200
From:   Priit Laes <plaes@...es.org>
To:     Kees Cook <keescook@...omium.org>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Colin Ian King <colin.king@...onical.com>,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        Varsha Rao <rvarsha016@...il.com>,
        linux-wireless@...r.kernel.org, b43-dev@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Priit Laes <plaes@...es.org>
Subject: [PATCH v3 1/3] lib: cordic: Move cordic macros and defines to header file

Now that these macros are in header file, we can eventually
clean up the duplicate macros present in the drivers that
utilize the same cordic algorithm implementation.

Also add CORDIC_ prefix to nonprefixed macros.

Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
Signed-off-by: Priit Laes <plaes@...es.org>
---
 include/linux/cordic.h |  9 +++++++++
 lib/cordic.c           | 23 +++++++----------------
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/include/linux/cordic.h b/include/linux/cordic.h
index cf68ca4..3d656f5 100644
--- a/include/linux/cordic.h
+++ b/include/linux/cordic.h
@@ -18,6 +18,15 @@
 
 #include <linux/types.h>
 
+#define CORDIC_ANGLE_GEN	39797
+#define CORDIC_PRECISION_SHIFT	16
+#define CORDIC_NUM_ITER	(CORDIC_PRECISION_SHIFT + 2)
+
+#define CORDIC_FIXED(X)	((s32)((X) << CORDIC_PRECISION_SHIFT))
+#define CORDIC_FLOAT(X)	(((X) >= 0) \
+		? ((((X) >> (CORDIC_PRECISION_SHIFT - 1)) + 1) >> 1) \
+		: -((((-(X)) >> (CORDIC_PRECISION_SHIFT - 1)) + 1) >> 1))
+
 /**
  * struct cordic_iq - i/q coordinate.
  *
diff --git a/lib/cordic.c b/lib/cordic.c
index 6cf4778..8ef27c1 100644
--- a/lib/cordic.c
+++ b/lib/cordic.c
@@ -16,15 +16,6 @@
 #include <linux/module.h>
 #include <linux/cordic.h>
 
-#define CORDIC_ANGLE_GEN	39797
-#define CORDIC_PRECISION_SHIFT	16
-#define	CORDIC_NUM_ITER		(CORDIC_PRECISION_SHIFT + 2)
-
-#define	FIXED(X)	((s32)((X) << CORDIC_PRECISION_SHIFT))
-#define	FLOAT(X)	(((X) >= 0) \
-		? ((((X) >> (CORDIC_PRECISION_SHIFT - 1)) + 1) >> 1) \
-		: -((((-(X)) >> (CORDIC_PRECISION_SHIFT - 1)) + 1) >> 1))
-
 static const s32 arctan_table[] = {
 	2949120,
 	1740967,
@@ -64,16 +55,16 @@ struct cordic_iq cordic_calc_iq(s32 theta)
 	coord.q = 0;
 	angle = 0;
 
-	theta = FIXED(theta);
+	theta = CORDIC_FIXED(theta);
 	signtheta = (theta < 0) ? -1 : 1;
-	theta = ((theta + FIXED(180) * signtheta) % FIXED(360)) -
-		FIXED(180) * signtheta;
+	theta = ((theta + CORDIC_FIXED(180) * signtheta) % CORDIC_FIXED(360)) -
+		CORDIC_FIXED(180) * signtheta;
 
-	if (FLOAT(theta) > 90) {
-		theta -= FIXED(180);
+	if (CORDIC_FLOAT(theta) > 90) {
+		theta -= CORDIC_FIXED(180);
 		signx = -1;
-	} else if (FLOAT(theta) < -90) {
-		theta += FIXED(180);
+	} else if (CORDIC_FLOAT(theta) < -90) {
+		theta += CORDIC_FIXED(180);
 		signx = -1;
 	}
 
-- 
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