/*
* Convert GHz frequency to IEEE channel number.
*/
int
ath_hal_mhz2ieee(struct ath_hal *ah, u_int freq, u_int flags)
{
if (flags & IEEE80211_CHAN_2GHZ) { /* 2GHz band */
if (freq == 2484)
return 14;
if (freq < 2484)
return ((int)freq - 2407) / 5;
else
return 15 + ((freq - 2512) / 20);
} else if (flags & IEEE80211_CHAN_5GHZ) {/* 5Ghz band */
if (IS_CHAN_IN_PUBLIC_SAFETY_BAND(freq))
return mappsb(freq, flags);
else if ((flags & IEEE80211_CHAN_A) && (freq <= 5000))
return (freq - 4000) / 5;
else
return (freq - 5000) / 5;
} else { /* either, guess */
if (freq == 2484)
return 14;
if (freq < 2484)
return ((int)freq - 2407) / 5;
if (freq < 5000) {
if (IS_CHAN_IN_PUBLIC_SAFETY_BAND(freq))
return mappsb(freq, flags);
else if (freq > 4900)
return (freq - 4000) / 5;
else
return 15 + ((freq - 2512) / 20);
}
return (freq - 5000) / 5;
}
}
/*
* Function : icm_convert_mhz2channel
* Description : converts MHz to IEEE channel
* Input params : freq in MHz
* Return : channel number
*
*/
int icm_convert_mhz2channel(u_int32_t freq)
{
#define IS_CHAN_IN_PUBLIC_SAFETY_BAND(_c) ((_c) > 4940 && (_c) < 4990)
if (freq == 2484)
return 14;
if (freq < 2484)
return (freq - 2407) / 5;
if (freq < 5000) {
if (IS_CHAN_IN_PUBLIC_SAFETY_BAND(freq)) {
return ((freq * 10) +
(((freq % 5) == 2) ? 5 : 0) - 49400)/5;
} else if (freq > 4900) {
return (freq - 4000) / 5;
} else {
return 15 + ((freq - 2512) / 20);
}
}
return (freq - 5000) / 5;
}
LBD_STATUS wlanifResolveRegclassAndChannum(u_int32_t freq, u_int8_t *channel,
u_int8_t *regClass) {
if (!channel || !regClass) {
return LBD_NOK;
}
*channel = 0;
*regClass = IEEE80211_RRM_REGCLASS_RESERVED;
freq /= 100000; // Convert to MHz
if ((freq >= 2412) && (freq <= 2472)) {
if (((freq - 2407) % 5) != 0) {
/* error: freq not exact */
return LBD_NOK;
}
*regClass = IEEE80211_RRM_REGCLASS_81; /* 2.407 GHz, channels 1..13 */
*channel = (freq - 2407) / 5;
return LBD_OK;
}
if (freq == 2484) {
*regClass = IEEE80211_RRM_REGCLASS_82; /* channel 14 */
*channel = 14;
return LBD_OK;
}
#define IS_CHAN_IN_PUBLIC_SAFETY_BAND(_c) ((_c) > 4940 && (_c) < 4990)
if (freq >= 2512 && freq < 5000) {
if (IS_CHAN_IN_PUBLIC_SAFETY_BAND(freq)) {
*channel = ((freq * 10) +
(((freq % 5) == 2) ? 5 : 0) - 49400)/5;
} else if ( freq > 4900 ) {
*channel = (freq - 4000) / 5;
} else {
*channel = 15 + ((freq - 2512) / 20);
}
// Since our chipset does not support bands other than 2.4 Ghz or 5 GHz,
// indicate failure here with channel resolved but regulatory class cannot
// be resolved.
return LBD_NOK;
}
#define FREQ_5G_CH(_chan_num) (5000 + (5 * _chan_num))
#define CASE_5G_FREQ(_chan_num) \
case FREQ_5G_CH(_chan_num): \
*channel = _chan_num; \
break;
if ((freq >= FREQ_5G_CH(36)) && (freq <= FREQ_5G_CH(48))) {
switch(freq) {
CASE_5G_FREQ(36);
CASE_5G_FREQ(40);
CASE_5G_FREQ(44);
CASE_5G_FREQ(48);
default:
/* No valid frequency in this range */
return LBD_NOK;
}
*regClass = IEEE80211_RRM_REGCLASS_115; /* 5 GHz, channels 36..48 */
return LBD_OK;
}
if ((freq >= FREQ_5G_CH(149)) && (freq <= FREQ_5G_CH(161))) {
switch(freq) {
CASE_5G_FREQ(149);
CASE_5G_FREQ(153);
CASE_5G_FREQ(157);
CASE_5G_FREQ(161);
default:
/* No valid frequency in this range */
return LBD_NOK;
}
*regClass = IEEE80211_RRM_REGCLASS_124; /* 5 GHz, channels 149..161 */
return LBD_OK;
}
if ((freq >= FREQ_5G_CH(8)) && (freq <= FREQ_5G_CH(16))) {
switch(freq) {
CASE_5G_FREQ(8);
CASE_5G_FREQ(12);
CASE_5G_FREQ(16);
default:
/* No valid frequency in this range */
return LBD_NOK;
}
*regClass = IEEE80211_RRM_REGCLASS_112; /* 5 GHz, channels 8, 12, 16 */
return LBD_OK;
}
if ((freq >= FREQ_5G_CH(52)) && (freq <= FREQ_5G_CH(64))) {
switch(freq) {
CASE_5G_FREQ(52);
CASE_5G_FREQ(56);
CASE_5G_FREQ(60);
CASE_5G_FREQ(64);
default:
/* No valid frequency in this range */
return LBD_NOK;
}
*regClass = IEEE80211_RRM_REGCLASS_118; /* 5 GHz, channels 52, 56, 60, 64 */
return LBD_OK;
}
if ((freq >= FREQ_5G_CH(100)) && (freq <= FREQ_5G_CH(140))) {
switch(freq) {
CASE_5G_FREQ(100);
CASE_5G_FREQ(104);
CASE_5G_FREQ(108);
CASE_5G_FREQ(112);
CASE_5G_FREQ(116);
CASE_5G_FREQ(120);
CASE_5G_FREQ(124);
CASE_5G_FREQ(128);
CASE_5G_FREQ(132);
CASE_5G_FREQ(136);
CASE_5G_FREQ(140);
default:
/* No valid frequency in this range */
return LBD_NOK;
}
*regClass = IEEE80211_RRM_REGCLASS_121; /* 5 GHz, channels 100, 104, 108, 112,
* 116, 120, 124, 128, 132, 136, 140 */
return LBD_OK;
}
return LBD_NOK;
#undef IS_CHAN_IN_PUBLIC_SAFETY_BAND
#undef CASE_5G_FREQ
#undef FREQ_5G_CH
}
