Input: move fixp-arith.h to drivers/input

Move fixp-arith.h from drivers/usb/input to drivers/input, as the part of
force feedback support that requires trigonometric functions is being moved
there.

Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 87 insertions, 0 deletions

diff --git a/drivers/input/fixp-arith.h b/drivers/input/fixp-arith.h
new file mode 100644
index 000000000000..ed3d2da0c485
--- /dev/null
+++ b/drivers/input/fixp-arith.h
@@ -0,0 +1,87 @@
+#ifndef _FIXP_ARITH_H
+#define _FIXP_ARITH_H
+
+/*
+ * Simplistic fixed-point arithmetics.
+ * Hmm, I'm probably duplicating some code :(
+ *
+ * Copyright (c) 2002 Johann Deneux
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Should you need to contact me, the author, you can do so by
+ * e-mail - mail your message to <deneux@ifrance.com>
+ */
+
+#include <linux/types.h>
+
+/* The type representing fixed-point values */
+typedef s16 fixp_t;
+
+#define FRAC_N 8
+#define FRAC_MASK ((1<<FRAC_N)-1)
+
+/* Not to be used directly. Use fixp_{cos,sin} */
+static const fixp_t cos_table[46] = {
+        0x0100, 0x00FF, 0x00FF, 0x00FE, 0x00FD, 0x00FC, 0x00FA, 0x00F8,
+        0x00F6, 0x00F3, 0x00F0, 0x00ED, 0x00E9, 0x00E6, 0x00E2, 0x00DD,
+        0x00D9, 0x00D4, 0x00CF, 0x00C9, 0x00C4, 0x00BE, 0x00B8, 0x00B1,
+        0x00AB, 0x00A4, 0x009D, 0x0096, 0x008F, 0x0087, 0x0080, 0x0078,
+        0x0070, 0x0068, 0x005F, 0x0057, 0x004F, 0x0046, 0x003D, 0x0035,
+        0x002C, 0x0023, 0x001A, 0x0011, 0x0008, 0x0000
+};
+
+
+/* a: 123 -> 123.0 */
+static inline fixp_t fixp_new(s16 a)
+{
+        return a<<FRAC_N;
+}
+
+/* a: 0xFFFF -> -1.0
+      0x8000 -> 1.0
+      0x0000 -> 0.0
+*/
+static inline fixp_t fixp_new16(s16 a)
+{
+        return ((s32)a)>>(16-FRAC_N);
+}
+
+static inline fixp_t fixp_cos(unsigned int degrees)
+{
+        int quadrant = (degrees / 90) & 3;
+        unsigned int i = degrees % 90;
+
+        if (quadrant == 1 || quadrant == 3)
+                i = 90 - i;
+
+        i >>= 1;
+
+        return (quadrant == 1 || quadrant == 2)? -cos_table[i] : cos_table[i];
+}
+
+static inline fixp_t fixp_sin(unsigned int degrees)
+{
+        return -fixp_cos(degrees + 90);
+}
+
+static inline fixp_t fixp_mult(fixp_t a, fixp_t b)
+{
+        return ((s32)(a*b))>>FRAC_N;
+}
+
+#endif