iwl3945: add debugfs support

Add debugfs support to 3945 driver to display rs info.

Signed-off-by: Mohamed Abbas <mohamed.abbas@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
index bfeef701b1fd..76100d5786fb 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
@@ -63,6 +63,9 @@ struct iwl3945_rs_sta {
         u8 ibss_sta_added;
         struct timer_list rate_scale_flush;
         struct iwl3945_rate_scale_data win[IWL_RATE_COUNT];
+#ifdef CONFIG_MAC80211_DEBUGFS
+        struct dentry *rs_sta_dbgfs_stats_table_file;
+#endif
 
         /* used to be in sta_info */
         int last_txrate_idx;
@@ -772,6 +775,60 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta,
         IWL_DEBUG_RATE("leave: %d\n", index);
 }
 
+#ifdef CONFIG_MAC80211_DEBUGFS
+static int iwl3945_open_file_generic(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+static ssize_t iwl3945_sta_dbgfs_stats_table_read(struct file *file,
+                                                  char __user *user_buf,
+                                                  size_t count, loff_t *ppos)
+{
+        char buff[1024];
+        int desc = 0;
+        int j;
+        struct iwl3945_rs_sta *lq_sta = file->private_data;
+
+        desc += sprintf(buff + desc, "tx packets=%d last rate index=%d\n"
+                        "rate=0x%X flush time %d\n",
+                        lq_sta->tx_packets,
+                        lq_sta->last_txrate_idx,
+                        lq_sta->start_rate, jiffies_to_msecs(lq_sta->flush_time));
+        for (j = 0; j < IWL_RATE_COUNT; j++) {
+                desc += sprintf(buff+desc,
+                                "counter=%d success=%d %%=%d\n",
+                                lq_sta->win[j].counter,
+                                lq_sta->win[j].success_counter,
+                                lq_sta->win[j].success_ratio);
+        }
+        return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
+}
+
+static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
+        .read = iwl3945_sta_dbgfs_stats_table_read,
+        .open = iwl3945_open_file_generic,
+};
+
+static void iwl3945_add_debugfs(void *priv, void *priv_sta,
+                                struct dentry *dir)
+{
+        struct iwl3945_rs_sta *lq_sta = priv_sta;
+
+        lq_sta->rs_sta_dbgfs_stats_table_file =
+                debugfs_create_file("rate_stats_table", 0600, dir,
+                lq_sta, &rs_sta_dbgfs_stats_table_ops);
+
+}
+
+static void iwl3945_remove_debugfs(void *priv, void *priv_sta)
+{
+        struct iwl3945_rs_sta *lq_sta = priv_sta;
+        debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
+}
+#endif
+
 static struct rate_control_ops rs_ops = {
         .module = NULL,
         .name = RS_NAME,
@@ -782,6 +839,11 @@ static struct rate_control_ops rs_ops = {
         .free = rs_free,
         .alloc_sta = rs_alloc_sta,
         .free_sta = rs_free_sta,
+#ifdef CONFIG_MAC80211_DEBUGFS
+        .add_sta_debugfs = iwl3945_add_debugfs,
+        .remove_sta_debugfs = iwl3945_remove_debugfs,
+#endif
+
 };
 
 void iwl3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)