From 986504540306137dfc90a936f9f25086d15621c5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Mon, 25 Jan 2010 18:59:59 +0100 Subject: b43: make cordic common (LP-PHY and N-PHY need it) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Rafał Miłecki Signed-off-by: John W. Linville --- drivers/net/wireless/b43/phy_lp.c | 45 ++------------------------------------- 1 file changed, 2 insertions(+), 43 deletions(-) (limited to 'drivers/net/wireless/b43/phy_lp.c') 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; -- cgit v1.2.3