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authorRafał Miłecki <zajec5@gmail.com>2010-01-25 20:59:59 +0300
committerJohn W. Linville <linville@tuxdriver.com>2010-01-26 00:36:31 +0300
commit986504540306137dfc90a936f9f25086d15621c5 (patch)
treee41a8ea05d14152054f07fe3c4bd2fbc3c7836bb /drivers/net/wireless/b43/phy_lp.c
parent3ed0fac3b56504aaaa3d800e7891ed4a7068b85c (diff)
downloadlinux-986504540306137dfc90a936f9f25086d15621c5.tar.xz
b43: make cordic common (LP-PHY and N-PHY need it)
Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/b43/phy_lp.c')
-rw-r--r--drivers/net/wireless/b43/phy_lp.c45
1 files changed, 2 insertions, 43 deletions
diff --git a/drivers/net/wireless/b43/phy_lp.c b/drivers/net/wireless/b43/phy_lp.c
index b58d6cf26580..453585073437 100644
--- a/drivers/net/wireless/b43/phy_lp.c
+++ b/drivers/net/wireless/b43/phy_lp.c
@@ -1767,47 +1767,6 @@ out:
return ret;
}
-/* Complex number using 2 32-bit signed integers */
-typedef struct {s32 i, q;} lpphy_c32;
-
-static lpphy_c32 lpphy_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;
- lpphy_c32 ret = { .i = 39797, .q = 0, };
-
- theta = clamp_t(int, theta, -180, 180);
-
- if (theta > 90) {
- theta -= 180;
- signx = -1;
- } else if (theta < -90) {
- theta += 180;
- signx = -1;
- }
-
- for (i = 0; i <= 17; i++) {
- if (theta > angle) {
- tmp = ret.i - (ret.q >> i);
- ret.q += ret.i >> i;
- ret.i = tmp;
- angle += arctg[i];
- } else {
- tmp = ret.i + (ret.q >> i);
- ret.q -= ret.i >> i;
- ret.i = tmp;
- angle -= arctg[i];
- }
- }
-
- ret.i *= signx;
- ret.q *= signx;
-
- return ret;
-}
-
static void lpphy_run_samples(struct b43_wldev *dev, u16 samples, u16 loops,
u16 wait)
{
@@ -1826,7 +1785,7 @@ static void lpphy_start_tx_tone(struct b43_wldev *dev, s32 freq, u16 max)
struct b43_phy_lp *lpphy = dev->phy.lp;
u16 buf[64];
int i, samples = 0, angle = 0, rotation = (9 * freq) / 500;
- lpphy_c32 sample;
+ struct b43_c32 sample;
lpphy->tx_tone_freq = freq;
@@ -1842,7 +1801,7 @@ static void lpphy_start_tx_tone(struct b43_wldev *dev, s32 freq, u16 max)
}
for (i = 0; i < samples; i++) {
- sample = lpphy_cordic(angle);
+ sample = b43_cordic(angle);
angle += rotation;
buf[i] = ((sample.i * max) & 0xFF) << 8;
buf[i] |= (sample.q * max) & 0xFF;