nl80211/cfg80211: add 5 and 10 MHz defines and wiphy flag

Add defines for 5 and 10 MHz channel width and fix channel
handling functions accordingly.

Also check for and report the WIPHY_FLAG_SUPPORTS_5_10_MHZ
capability.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
[fix spelling in comment]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 49 insertions, 8 deletions

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index fd556ac..50f6195 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -54,6 +54,8 @@ bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
 	control_freq = chandef->chan->center_freq;
 
 	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_5:
+	case NL80211_CHAN_WIDTH_10:
 	case NL80211_CHAN_WIDTH_20:
 	case NL80211_CHAN_WIDTH_20_NOHT:
 		if (chandef->center_freq1 != control_freq)
@@ -152,6 +154,12 @@ static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
 	int width;
 
 	switch (c->width) {
+	case NL80211_CHAN_WIDTH_5:
+		width = 5;
+		break;
+	case NL80211_CHAN_WIDTH_10:
+		width = 10;
+		break;
 	case NL80211_CHAN_WIDTH_20:
 	case NL80211_CHAN_WIDTH_20_NOHT:
 		width = 20;
@@ -194,6 +202,16 @@ cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
 	if (c1->width == c2->width)
 		return NULL;
 
+	/*
+	 * can't be compatible if one of them is 5 or 10 MHz,
+	 * but they don't have the same width.
+	 */
+	if (c1->width == NL80211_CHAN_WIDTH_5 ||
+	    c1->width == NL80211_CHAN_WIDTH_10 ||
+	    c2->width == NL80211_CHAN_WIDTH_5 ||
+	    c2->width == NL80211_CHAN_WIDTH_10)
+		return NULL;
+
 	if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
 	    c1->width == NL80211_CHAN_WIDTH_20)
 		return c2;
@@ -264,11 +282,17 @@ static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
 					    u32 bandwidth)
 {
 	struct ieee80211_channel *c;
-	u32 freq;
+	u32 freq, start_freq, end_freq;
+
+	if (bandwidth <= 20) {
+		start_freq = center_freq;
+		end_freq = center_freq;
+	} else {
+		start_freq = center_freq - bandwidth/2 + 10;
+		end_freq = center_freq + bandwidth/2 - 10;
+	}
 
-	for (freq = center_freq - bandwidth/2 + 10;
-	     freq <= center_freq + bandwidth/2 - 10;
-	     freq += 20) {
+	for (freq = start_freq; freq <= end_freq; freq += 20) {
 		c = ieee80211_get_channel(wiphy, freq);
 		if (!c)
 			return -EINVAL;
@@ -310,11 +334,17 @@ static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
 					u32 prohibited_flags)
 {
 	struct ieee80211_channel *c;
-	u32 freq;
+	u32 freq, start_freq, end_freq;
+
+	if (bandwidth <= 20) {
+		start_freq = center_freq;
+		end_freq = center_freq;
+	} else {
+		start_freq = center_freq - bandwidth/2 + 10;
+		end_freq = center_freq + bandwidth/2 - 10;
+	}
 
-	for (freq = center_freq - bandwidth/2 + 10;
-	     freq <= center_freq + bandwidth/2 - 10;
-	     freq += 20) {
+	for (freq = start_freq; freq <= end_freq; freq += 20) {
 		c = ieee80211_get_channel(wiphy, freq);
 		if (!c)
 			return false;
@@ -349,6 +379,12 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 	control_freq = chandef->chan->center_freq;
 
 	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_5:
+		width = 5;
+		break;
+	case NL80211_CHAN_WIDTH_10:
+		width = 10;
+		break;
 	case NL80211_CHAN_WIDTH_20:
 		if (!ht_cap->ht_supported)
 			return false;
@@ -405,6 +441,11 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 	if (width > 20)
 		prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
 
+	/* 5 and 10 MHz are only defined for the OFDM PHY */
+	if (width < 20)
+		prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
+
+
 	if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
 					 width, prohibited_flags))
 		return false;