b43: update cordic code to match current specs
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/phy_common.c b/drivers/net/wireless/b43/phy_common.c
index 446c41b..8f7d7ef 100644
--- a/drivers/net/wireless/b43/phy_common.c
+++ b/drivers/net/wireless/b43/phy_common.c
@@ -422,21 +422,28 @@
b43_write16(dev, B43_MMIO_PHY0, on ? 0 : 0xF4);
}
+/* http://bcm-v4.sipsolutions.net/802.11/PHY/Cordic */
struct b43_c32 b43_cordic(int theta)
{
u32 arctg[] = { 2949120, 1740967, 919879, 466945, 234379, 117304,
58666, 29335, 14668, 7334, 3667, 1833, 917, 458,
229, 115, 57, 29, };
- int i, tmp, signx = 1, angle = 0;
+ u8 i;
+ s32 tmp;
+ s8 signx = 1;
+ u32 angle = 0;
struct b43_c32 ret = { .i = 39797, .q = 0, };
- theta = clamp_t(int, theta, -180, 180);
+ while (theta > (180 << 16))
+ theta -= (360 << 16);
+ while (theta < -(180 << 16))
+ theta += (360 << 16);
- if (theta > 90) {
- theta -= 180;
+ if (theta > (90 << 16)) {
+ theta -= (180 << 16);
signx = -1;
- } else if (theta < -90) {
- theta += 180;
+ } else if (theta < -(90 << 16)) {
+ theta += (180 << 16);
signx = -1;
}