wifi: cfg80211: Add utility for converting op_class into chandef

This utility is used in STA CSA handling. The op_class in the ECSA
Element can be converted into chandef.

Co-developed-by: Money Wang <money.wang@mediatek.com>
Signed-off-by: Michael-CY Lee <michael-cy.lee@mediatek.com>
Link: https://msgid.link/20231222010914.6521-2-michael-cy.lee@mediatek.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/net/wireless/util.c b/net/wireless/util.c
index d1ce3bee2797..379f742fd741 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -2073,6 +2073,82 @@ bool ieee80211_operating_class_to_band(u8 operating_class,
 }
 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
 
+bool ieee80211_operating_class_to_chandef(u8 operating_class,
+					  struct ieee80211_channel *chan,
+					  struct cfg80211_chan_def *chandef)
+{
+	u32 control_freq, offset = 0;
+	enum nl80211_band band;
+
+	if (!ieee80211_operating_class_to_band(operating_class, &band) ||
+	    !chan || band != chan->band)
+		return false;
+
+	control_freq = chan->center_freq;
+	chandef->chan = chan;
+
+	if (control_freq >= 5955)
+		offset = control_freq - 5955;
+	else if (control_freq >= 5745)
+		offset = control_freq - 5745;
+	else if (control_freq >= 5180)
+		offset = control_freq - 5180;
+	offset /= 20;
+
+	switch (operating_class) {
+	case 81:  /* 2 GHz band; 20 MHz; channels 1..13 */
+	case 82:  /* 2 GHz band; 20 MHz; channel 14 */
+	case 115: /* 5 GHz band; 20 MHz; channels 36,40,44,48 */
+	case 118: /* 5 GHz band; 20 MHz; channels 52,56,60,64 */
+	case 121: /* 5 GHz band; 20 MHz; channels 100..144 */
+	case 124: /* 5 GHz band; 20 MHz; channels 149,153,157,161 */
+	case 125: /* 5 GHz band; 20 MHz; channels 149..177 */
+	case 131: /* 6 GHz band; 20 MHz; channels 1..233*/
+	case 136: /* 6 GHz band; 20 MHz; channel 2 */
+		chandef->center_freq1 = control_freq;
+		chandef->width = NL80211_CHAN_WIDTH_20;
+		return true;
+	case 83:  /* 2 GHz band; 40 MHz; channels 1..9 */
+	case 116: /* 5 GHz band; 40 MHz; channels 36,44 */
+	case 119: /* 5 GHz band; 40 MHz; channels 52,60 */
+	case 122: /* 5 GHz band; 40 MHz; channels 100,108,116,124,132,140 */
+	case 126: /* 5 GHz band; 40 MHz; channels 149,157,165,173 */
+		chandef->center_freq1 = control_freq + 10;
+		chandef->width = NL80211_CHAN_WIDTH_40;
+		return true;
+	case 84:  /* 2 GHz band; 40 MHz; channels 5..13 */
+	case 117: /* 5 GHz band; 40 MHz; channels 40,48 */
+	case 120: /* 5 GHz band; 40 MHz; channels 56,64 */
+	case 123: /* 5 GHz band; 40 MHz; channels 104,112,120,128,136,144 */
+	case 127: /* 5 GHz band; 40 MHz; channels 153,161,169,177 */
+		chandef->center_freq1 = control_freq - 10;
+		chandef->width = NL80211_CHAN_WIDTH_40;
+		return true;
+	case 132: /* 6 GHz band; 40 MHz; channels 1,5,..,229*/
+		chandef->center_freq1 = control_freq + 10 - (offset & 1) * 20;
+		chandef->width = NL80211_CHAN_WIDTH_40;
+		return true;
+	case 128: /* 5 GHz band; 80 MHz; channels 36..64,100..144,149..177 */
+	case 133: /* 6 GHz band; 80 MHz; channels 1,5,..,229 */
+		chandef->center_freq1 = control_freq + 30 - (offset & 3) * 20;
+		chandef->width = NL80211_CHAN_WIDTH_80;
+		return true;
+	case 129: /* 5 GHz band; 160 MHz; channels 36..64,100..144,149..177 */
+	case 134: /* 6 GHz band; 160 MHz; channels 1,5,..,229 */
+		chandef->center_freq1 = control_freq + 70 - (offset & 7) * 20;
+		chandef->width = NL80211_CHAN_WIDTH_160;
+		return true;
+	case 130: /* 5 GHz band; 80+80 MHz; channels 36..64,100..144,149..177 */
+	case 135: /* 6 GHz band; 80+80 MHz; channels 1,5,..,229 */
+		  /* The center_freq2 of 80+80 MHz is unknown */
+	case 137: /* 6 GHz band; 320 MHz; channels 1,5,..,229 */
+		  /* 320-1 or 320-2 channelization is unknown */
+	default:
+		return false;
+	}
+}
+EXPORT_SYMBOL(ieee80211_operating_class_to_chandef);
+
 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
 					  u8 *op_class)
 {