Here's a screenshot of what this looks like with ath9k:
mcgrof@pogo /debug/ieee80211/phy0 $ cat ht40allow_map
2412 HT40 +
2417 HT40 +
2422 HT40 +
2427 HT40 +
2432 HT40 -+
2437 HT40 -+
2442 HT40 -+
2447 HT40 -
2452 HT40 -
2457 HT40 -
2462 HT40 -
2467 Disabled
2472 Disabled
2484 Disabled
5180 HT40 +
5200 HT40 -+
5220 HT40 -+
5240 HT40 -+
5260 HT40 -+
5280 HT40 -+
5300 HT40 -+
5320 HT40 -
5500 HT40 +
5520 HT40 -+
5540 HT40 -+
5560 HT40 -+
5580 HT40 -+
5600 HT40 -+
5620 HT40 -+
5640 HT40 -+
5660 HT40 -+
5680 HT40 -+
5700 HT40 -
5745 HT40 +
5765 HT40 -+
5785 HT40 -+
5805 HT40 -+
5825 HT40 -
Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>
---
net/wireless/core.h | 1 +
net/wireless/debugfs.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 62 insertions(+), 0 deletions(-)
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 5756e80..b705149 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -58,6 +58,7 @@ struct cfg80211_registered_device {
struct dentry *fragmentation_threshold;
struct dentry *short_retry_limit;
struct dentry *long_retry_limit;
+ struct dentry *ht40allow_map;
} debugfs;
#endif
diff --git a/net/wireless/debugfs.c b/net/wireless/debugfs.c
index 3211e0e..679ddfc 100644
--- a/net/wireless/debugfs.c
+++ b/net/wireless/debugfs.c
@@ -44,6 +44,65 @@ DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
wiphy->retry_long);
+static int ht_print_chan(struct ieee80211_channel *chan,
+ char *buf, int buf_size, int offset)
+{
+ if (WARN_ON(offset > buf_size))
+ return 0;
+
+ if (chan->flags & IEEE80211_CHAN_DISABLED)
+ return snprintf(buf + offset,
+ buf_size - offset,
+ "%d Disabled\n",
+ chan->center_freq);
+
+ return snprintf(buf + offset,
+ buf_size - offset,
+ "%d HT40 %c%c\n",
+ chan->center_freq,
+ (chan->flags & IEEE80211_CHAN_NO_HT40MINUS) ? ' ' : '-',
+ (chan->flags & IEEE80211_CHAN_NO_HT40PLUS) ? ' ' : '+');
+}
+
+static ssize_t ht40allow_map_read(struct file *file,
+ char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct wiphy *wiphy = file->private_data;
+ char *buf;
+ unsigned int offset = 0, buf_size = PAGE_SIZE, i, r;
+ enum ieee80211_band band;
+ struct ieee80211_supported_band *sband;
+
+ buf = kzalloc(buf_size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ mutex_lock(&cfg80211_mutex);
+
+ for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
+ sband = wiphy->bands[band];
+ if (!sband)
+ continue;
+ for (i = 0; i < sband->n_channels; i++)
+ offset += ht_print_chan(&sband->channels[i],
+ buf, buf_size, offset);
+ }
+
+ mutex_unlock(&cfg80211_mutex);
+
+ r = simple_read_from_buffer(user_buf, count, ppos, buf, offset);
+
+ kfree(buf);
+
+ return r;
+}
+
+static const struct file_operations ht40allow_map_ops = {
+ .read = ht40allow_map_read,
+ .open = cfg80211_open_file_generic,
+};
+
#define DEBUGFS_ADD(name) \
drv->debugfs.name = debugfs_create_file(#name, S_IRUGO, phyd, \
&drv->wiphy, &name## _ops);
@@ -59,6 +118,7 @@ void cfg80211_debugfs_drv_add(struct cfg80211_registered_device *drv)
DEBUGFS_ADD(fragmentation_threshold);
DEBUGFS_ADD(short_retry_limit);
DEBUGFS_ADD(long_retry_limit);
+ DEBUGFS_ADD(ht40allow_map);
}
void cfg80211_debugfs_drv_del(struct cfg80211_registered_device *drv)
@@ -67,4 +127,5 @@ void cfg80211_debugfs_drv_del(struct cfg80211_registered_device *drv)
DEBUGFS_DEL(fragmentation_threshold);
DEBUGFS_DEL(short_retry_limit);
DEBUGFS_DEL(long_retry_limit);
+ DEBUGFS_DEL(ht40allow_map);
}
--
1.6.0.6
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