[PATCH] ipw2200: add channels sysfs entry

Add 'channels' sysfs entry for ipw2200. The entry exports channels
information for the user space.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
index 4839a45098c..2069908a306 100644
--- a/drivers/net/wireless/ipw2200.c
+++ b/drivers/net/wireless/ipw2200.c
@@ -1847,6 +1847,52 @@ static ssize_t store_net_stats(struct device *d, struct device_attribute *attr,
 static DEVICE_ATTR(net_stats, S_IWUSR | S_IRUGO,
                    show_net_stats, store_net_stats);
 
+static ssize_t show_channels(struct device *d,
+                             struct device_attribute *attr,
+                             char *buf)
+{
+        struct ipw_priv *priv = dev_get_drvdata(d);
+        const struct ieee80211_geo *geo = ipw_get_geo(priv->ieee);
+        int len = 0, i;
+
+        len = sprintf(&buf[len],
+                      "Displaying %d channels in 2.4Ghz band "
+                      "(802.11bg):\n", geo->bg_channels);
+
+        for (i = 0; i < geo->bg_channels; i++) {
+                len += sprintf(&buf[len], "%d: BSS%s%s, %s, Band %s.\n",
+                               geo->bg[i].channel,
+                               geo->bg[i].flags & IEEE80211_CH_RADAR_DETECT ?
+                               " (radar spectrum)" : "",
+                               ((geo->bg[i].flags & IEEE80211_CH_NO_IBSS) ||
+                                (geo->bg[i].flags & IEEE80211_CH_RADAR_DETECT))
+                               ? "" : ", IBSS",
+                               geo->bg[i].flags & IEEE80211_CH_PASSIVE_ONLY ?
+                               "passive only" : "active/passive",
+                               geo->bg[i].flags & IEEE80211_CH_B_ONLY ?
+                               "B" : "B/G");
+        }
+
+        len += sprintf(&buf[len],
+                       "Displaying %d channels in 5.2Ghz band "
+                       "(802.11a):\n", geo->a_channels);
+        for (i = 0; i < geo->a_channels; i++) {
+                len += sprintf(&buf[len], "%d: BSS%s%s, %s.\n",
+                               geo->a[i].channel,
+                               geo->a[i].flags & IEEE80211_CH_RADAR_DETECT ?
+                               " (radar spectrum)" : "",
+                               ((geo->a[i].flags & IEEE80211_CH_NO_IBSS) ||
+                                (geo->a[i].flags & IEEE80211_CH_RADAR_DETECT))
+                               ? "" : ", IBSS",
+                               geo->a[i].flags & IEEE80211_CH_PASSIVE_ONLY ?
+                               "passive only" : "active/passive");
+        }
+
+        return len;
+}
+
+static DEVICE_ATTR(channels, S_IRUSR, show_channels, NULL);
+
 static void notify_wx_assoc_event(struct ipw_priv *priv)
 {
         union iwreq_data wrqu;
@@ -11383,6 +11429,7 @@ static struct attribute *ipw_sysfs_entries[] = {
         &dev_attr_led.attr,
         &dev_attr_speed_scan.attr,
         &dev_attr_net_stats.attr,
+        &dev_attr_channels.attr,
 #ifdef CONFIG_IPW2200_PROMISCUOUS
         &dev_attr_rtap_iface.attr,
         &dev_attr_rtap_filter.attr,