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carl9170: use generic sign_extend32

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This patch replaces the handcrafted
sign extension cruft with a generic
bitop function.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2010-10-29 23:11:23 +02:00 committed by John W. Linville
parent 7919a57bc6
commit b1d771ee33
1 changed files with 4 additions and 13 deletions
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17
drivers/net/wireless/ath/carl9170/phy.c
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@ -1554,15 +1554,6 @@ static int carl9170_set_power_cal(struct ar9170 *ar, u32 freq,
return carl9170_regwrite_result();
}
/* TODO: replace this with sign_extend32(noise, 8) */
static int carl9170_calc_noise_dbm(u32 raw_noise)
{
if (raw_noise & 0x100)
return ~0x1ff | raw_noise;
else
return raw_noise;
}
int carl9170_get_noisefloor(struct ar9170 *ar)
{
static const u32 phy_regs[] = {
@ -1578,11 +1569,11 @@ int carl9170_get_noisefloor(struct ar9170 *ar)
return err;
for (i = 0; i < 2; i++) {
ar->noise[i] = carl9170_calc_noise_dbm(
(phy_res[i] >> 19) & 0x1ff);
ar->noise[i] = sign_extend32(GET_VAL(
AR9170_PHY_CCA_MIN_PWR, phy_res[i]), 8);
ar->noise[i + 2] = carl9170_calc_noise_dbm(
(phy_res[i + 2] >> 23) & 0x1ff);
ar->noise[i + 2] = sign_extend32(GET_VAL(
AR9170_PHY_EXT_CCA_MIN_PWR, phy_res[i + 2]), 8);
}
return 0;