mac80211/cfg80211: move wiphy specific debugfs entries to cfg80211

This moves the cfg80211 specific stuff to new cfg80211 debugfs
entries. Non-mac80211 will also get these entries now. There were
only 4 which we take:

rts_threshold
fragmentation_threshold
short_retry_limit
long_retry_limit

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

6 files changed, 109 insertions, 0 deletions

diff --git a/net/wireless/Kconfig b/net/wireless/Kconfig
index 3c3bc9e579ed..45005497c634 100644
--- a/net/wireless/Kconfig
+++ b/net/wireless/Kconfig
@@ -10,6 +10,14 @@ config CFG80211_REG_DEBUG
 
           If unsure, say N.
 
+config CFG80211_DEBUGFS
+        bool "cfg80211 DebugFS entries"
+        depends on CFG80211 && DEBUG_FS
+        ---help---
+          You can enable this if you want to debugfs entries for cfg80211.
+
+          If unsure, say N.
+
 config WIRELESS_OLD_REGULATORY
         bool "Old wireless static regulatory definitions"
         default n
diff --git a/net/wireless/Makefile b/net/wireless/Makefile
index 14ea01c4a103..f78c4832a9ca 100644
--- a/net/wireless/Makefile
+++ b/net/wireless/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_LIB80211_CRYPT_CCMP) += lib80211_crypt_ccmp.o
 obj-$(CONFIG_LIB80211_CRYPT_TKIP) += lib80211_crypt_tkip.o
 
 cfg80211-y += core.o sysfs.o radiotap.o util.o reg.o scan.o nl80211.o mlme.o ibss.o
+cfg80211-$(CONFIG_CFG80211_DEBUGFS) += debugfs.o
 cfg80211-$(CONFIG_WIRELESS_EXT) += wext-compat.o
 
 ccflags-y += -D__CHECK_ENDIAN__
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 47c20eb0c04d..b6ef5337c85f 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -17,6 +17,7 @@
 #include "nl80211.h"
 #include "core.h"
 #include "sysfs.h"
+#include "debugfs.h"
 
 /* name for sysfs, %d is appended */
 #define PHY_NAME "phy"
@@ -375,6 +376,8 @@ int wiphy_register(struct wiphy *wiphy)
                 nl80211_send_reg_change_event(&request);
         }
 
+        cfg80211_debugfs_drv_add(drv);
+
         res = 0;
 out_unlock:
         mutex_unlock(&cfg80211_mutex);
@@ -405,6 +408,8 @@ void wiphy_unregister(struct wiphy *wiphy)
         /* unlock again before freeing */
         mutex_unlock(&drv->mtx);
 
+        cfg80211_debugfs_drv_del(drv);
+
         /* If this device got a regulatory hint tell core its
          * free to listen now to a new shiny device regulatory hint */
         reg_device_remove(wiphy);
diff --git a/net/wireless/core.h b/net/wireless/core.h
index f14b6c5f4221..930a80124dbf 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -10,6 +10,7 @@
 #include <linux/netdevice.h>
 #include <linux/kref.h>
 #include <linux/rbtree.h>
+#include <linux/debugfs.h>
 #include <net/genetlink.h>
 #include <net/cfg80211.h>
 #include "reg.h"
@@ -50,6 +51,16 @@ struct cfg80211_registered_device {
         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
         unsigned long suspend_at;
 
+#ifdef CONFIG_MAC80211_DEBUGFS
+        /* Debugfs entries */
+        struct wiphy_debugfsdentries {
+                struct dentry *rts_threshold;
+                struct dentry *fragmentation_threshold;
+                struct dentry *short_retry_limit;
+                struct dentry *long_retry_limit;
+        } debugfs;
+#endif
+
         /* must be last because of the way we do wiphy_priv(),
          * and it should at least be aligned to NETDEV_ALIGN */
         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
diff --git a/net/wireless/debugfs.c b/net/wireless/debugfs.c
new file mode 100644
index 000000000000..3211e0e9fe4c
--- /dev/null
+++ b/net/wireless/debugfs.c
@@ -0,0 +1,70 @@
+/*
+ * cfg80211 debugfs
+ *
+ * Copyright 2009       Luis R. Rodriguez <lrodriguez@atheros.com>
+ * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "core.h"
+#include "debugfs.h"
+
+static int cfg80211_open_file_generic(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+#define DEBUGFS_READONLY_FILE(name, buflen, fmt, value...)              \
+static ssize_t name## _read(struct file *file, char __user *userbuf,    \
+                            size_t count, loff_t *ppos)                 \
+{                                                                       \
+        struct wiphy *wiphy= file->private_data;                \
+        char buf[buflen];                                               \
+        int res;                                                        \
+                                                                        \
+        res = scnprintf(buf, buflen, fmt "\n", ##value);                \
+        return simple_read_from_buffer(userbuf, count, ppos, buf, res); \
+}                                                                       \
+                                                                        \
+static const struct file_operations name## _ops = {                     \
+        .read = name## _read,                                           \
+        .open = cfg80211_open_file_generic,                             \
+};
+
+DEBUGFS_READONLY_FILE(rts_threshold, 20, "%d",
+                      wiphy->rts_threshold)
+DEBUGFS_READONLY_FILE(fragmentation_threshold, 20, "%d",
+                      wiphy->frag_threshold);
+DEBUGFS_READONLY_FILE(short_retry_limit, 20, "%d",
+                      wiphy->retry_short)
+DEBUGFS_READONLY_FILE(long_retry_limit, 20, "%d",
+                      wiphy->retry_long);
+
+#define DEBUGFS_ADD(name)                                               \
+        drv->debugfs.name = debugfs_create_file(#name, S_IRUGO, phyd,   \
+                                                  &drv->wiphy, &name## _ops);
+#define DEBUGFS_DEL(name)                                               \
+        debugfs_remove(drv->debugfs.name);                              \
+        drv->debugfs.name = NULL;
+
+void cfg80211_debugfs_drv_add(struct cfg80211_registered_device *drv)
+{
+        struct dentry *phyd = drv->wiphy.debugfsdir;
+
+        DEBUGFS_ADD(rts_threshold);
+        DEBUGFS_ADD(fragmentation_threshold);
+        DEBUGFS_ADD(short_retry_limit);
+        DEBUGFS_ADD(long_retry_limit);
+}
+
+void cfg80211_debugfs_drv_del(struct cfg80211_registered_device *drv)
+{
+        DEBUGFS_DEL(rts_threshold);
+        DEBUGFS_DEL(fragmentation_threshold);
+        DEBUGFS_DEL(short_retry_limit);
+        DEBUGFS_DEL(long_retry_limit);
+}
diff --git a/net/wireless/debugfs.h b/net/wireless/debugfs.h
new file mode 100644
index 000000000000..c226983ae66b
--- /dev/null
+++ b/net/wireless/debugfs.h
@@ -0,0 +1,14 @@
+#ifndef __CFG80211_DEBUGFS_H
+#define __CFG80211_DEBUGFS_H
+
+#ifdef CONFIG_CFG80211_DEBUGFS
+void cfg80211_debugfs_drv_add(struct cfg80211_registered_device *drv);
+void cfg80211_debugfs_drv_del(struct cfg80211_registered_device *drv);
+#else
+static inline
+void cfg80211_debugfs_drv_add(struct cfg80211_registered_device *drv) {}
+static inline
+void cfg80211_debugfs_drv_del(struct cfg80211_registered_device *drv) {}
+#endif
+
+#endif /* __CFG80211_DEBUGFS_H */