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path: root/drivers/usb/input/fixp-arith.h
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Diffstat (limited to 'drivers/usb/input/fixp-arith.h')
-rw-r--r--drivers/usb/input/fixp-arith.h15
1 files changed, 6 insertions, 9 deletions
diff --git a/drivers/usb/input/fixp-arith.h b/drivers/usb/input/fixp-arith.h
index b44d398de071..ed3d2da0c485 100644
--- a/drivers/usb/input/fixp-arith.h
+++ b/drivers/usb/input/fixp-arith.h
@@ -2,8 +2,6 @@
2#define _FIXP_ARITH_H 2#define _FIXP_ARITH_H
3 3
4/* 4/*
5 * $$
6 *
7 * Simplistic fixed-point arithmetics. 5 * Simplistic fixed-point arithmetics.
8 * Hmm, I'm probably duplicating some code :( 6 * Hmm, I'm probably duplicating some code :(
9 * 7 *
@@ -31,20 +29,20 @@
31 29
32#include <linux/types.h> 30#include <linux/types.h>
33 31
34// The type representing fixed-point values 32/* The type representing fixed-point values */
35typedef s16 fixp_t; 33typedef s16 fixp_t;
36 34
37#define FRAC_N 8 35#define FRAC_N 8
38#define FRAC_MASK ((1<<FRAC_N)-1) 36#define FRAC_MASK ((1<<FRAC_N)-1)
39 37
40// Not to be used directly. Use fixp_{cos,sin} 38/* Not to be used directly. Use fixp_{cos,sin} */
41static const fixp_t cos_table[45] = { 39static const fixp_t cos_table[46] = {
42 0x0100, 0x00FF, 0x00FF, 0x00FE, 0x00FD, 0x00FC, 0x00FA, 0x00F8, 40 0x0100, 0x00FF, 0x00FF, 0x00FE, 0x00FD, 0x00FC, 0x00FA, 0x00F8,
43 0x00F6, 0x00F3, 0x00F0, 0x00ED, 0x00E9, 0x00E6, 0x00E2, 0x00DD, 41 0x00F6, 0x00F3, 0x00F0, 0x00ED, 0x00E9, 0x00E6, 0x00E2, 0x00DD,
44 0x00D9, 0x00D4, 0x00CF, 0x00C9, 0x00C4, 0x00BE, 0x00B8, 0x00B1, 42 0x00D9, 0x00D4, 0x00CF, 0x00C9, 0x00C4, 0x00BE, 0x00B8, 0x00B1,
45 0x00AB, 0x00A4, 0x009D, 0x0096, 0x008F, 0x0087, 0x0080, 0x0078, 43 0x00AB, 0x00A4, 0x009D, 0x0096, 0x008F, 0x0087, 0x0080, 0x0078,
46 0x0070, 0x0068, 0x005F, 0x0057, 0x004F, 0x0046, 0x003D, 0x0035, 44 0x0070, 0x0068, 0x005F, 0x0057, 0x004F, 0x0046, 0x003D, 0x0035,
47 0x002C, 0x0023, 0x001A, 0x0011, 0x0008 45 0x002C, 0x0023, 0x001A, 0x0011, 0x0008, 0x0000
48}; 46};
49 47
50 48
@@ -68,9 +66,8 @@ static inline fixp_t fixp_cos(unsigned int degrees)
68 int quadrant = (degrees / 90) & 3; 66 int quadrant = (degrees / 90) & 3;
69 unsigned int i = degrees % 90; 67 unsigned int i = degrees % 90;
70 68
71 if (quadrant == 1 || quadrant == 3) { 69 if (quadrant == 1 || quadrant == 3)
72 i = 89 - i; 70 i = 90 - i;
73 }
74 71
75 i >>= 1; 72 i >>= 1;
76 73