rtlwifi: Improve debugging by using debugfs

Use debugfs to dump register and btcoex status, and also write registers
and h2c.

We create topdir in /sys/kernel/debug/rtlwifi/, and use the MAC address
as subdirectory with several entries to dump mac_reg, bb_reg, rf_reg etc.
An example is
    /sys/kernel/debug/rtlwifi/00-11-22-33-44-55-66/mac_0

This change permits examination of device registers in a dynamic manner,
a feature not available with the current debug mechanism.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/realtek/rtlwifi/base.c

@@ -2530,6 +2530,9 @@ static int __init rtl_core_module_init(void)
 	if (rtl_rate_control_register())
 		pr_err("rtl: Unable to register rtl_rc, use default RC !!\n");
 
+	/* add debugfs */
+	rtl_debugfs_add_topdir();
+
 	/* init some global vars */
 	INIT_LIST_HEAD(&rtl_global_var.glb_priv_list);
 	spin_lock_init(&rtl_global_var.glb_list_lock);
@@ -2541,6 +2544,9 @@ static void __exit rtl_core_module_exit(void)
 {
 	/*RC*/
 	rtl_rate_control_unregister();
+
+	/* remove debugfs */
+	rtl_debugfs_remove_topdir();
 }
 
 module_init(rtl_core_module_init);

drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c

@@ -1513,7 +1513,8 @@ void exhalbtc_set_single_ant_path(u8 single_ant_path)
 	gl_bt_coexist.board_info.single_ant_path = single_ant_path;
 }
 
-void exhalbtc_display_bt_coex_info(struct btc_coexist *btcoexist)
+void exhalbtc_display_bt_coex_info(struct btc_coexist *btcoexist,
+				   struct seq_file *m)
 {
 	if (!halbtc_is_bt_coexist_available(btcoexist))
 		return;

drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.h

@@ -626,7 +626,8 @@ void exhalbtc_update_min_bt_rssi(s8 bt_rssi);
 void exhalbtc_set_bt_exist(bool bt_exist);
 void exhalbtc_set_chip_type(u8 chip_type);
 void exhalbtc_set_ant_num(struct rtl_priv *rtlpriv, u8 type, u8 ant_num);
-void exhalbtc_display_bt_coex_info(struct btc_coexist *btcoexist);
+void exhalbtc_display_bt_coex_info(struct btc_coexist *btcoexist,
+				   struct seq_file *m);
 void exhalbtc_signal_compensation(struct btc_coexist *btcoexist,
 				  u8 *rssi_wifi, u8 *rssi_bt);
 void exhalbtc_lps_leave(struct btc_coexist *btcoexist);

drivers/net/wireless/realtek/rtlwifi/btcoexist/rtl_btc.c

@@ -52,8 +52,14 @@ static struct rtl_btc_ops rtl_btc_operation = {
 	.btc_is_bt_ctrl_lps = rtl_btc_is_bt_ctrl_lps,
 	.btc_is_bt_lps_on = rtl_btc_is_bt_lps_on,
 	.btc_get_ampdu_cfg = rtl_btc_get_ampdu_cfg,
+	.btc_display_bt_coex_info = rtl_btc_display_bt_coex_info,
 };
 
+void rtl_btc_display_bt_coex_info(struct rtl_priv *rtlpriv, struct seq_file *m)
+{
+	exhalbtc_display_bt_coex_info(&gl_bt_coexist, m);
+}
+
 void rtl_btc_record_pwr_mode(struct rtl_priv *rtlpriv, u8 *buf, u8 len)
 {
 	u8 safe_len;

drivers/net/wireless/realtek/rtlwifi/btcoexist/rtl_btc.h

@@ -44,6 +44,7 @@ bool rtl_btc_is_limited_dig(struct rtl_priv *rtlpriv);
 bool rtl_btc_is_disable_edca_turbo(struct rtl_priv *rtlpriv);
 bool rtl_btc_is_bt_disabled(struct rtl_priv *rtlpriv);
 void rtl_btc_special_packet_notify(struct rtl_priv *rtlpriv, u8 pkt_type);
+void rtl_btc_display_bt_coex_info(struct rtl_priv *rtlpriv, struct seq_file *m);
 void rtl_btc_record_pwr_mode(struct rtl_priv *rtlpriv, u8 *buf, u8 len);
 u8   rtl_btc_get_lps_val(struct rtl_priv *rtlpriv);
 u8   rtl_btc_get_rpwm_val(struct rtl_priv *rtlpriv);

drivers/net/wireless/realtek/rtlwifi/debug.h

@@ -218,5 +218,17 @@ static inline void RT_PRINT_DATA(struct rtl_priv *rtlpriv,
 {
 }
 
+#endif
+
+#ifdef CONFIG_RTLWIFI_DEBUG
+void rtl_debug_add_one(struct ieee80211_hw *hw);
+void rtl_debug_remove_one(struct ieee80211_hw *hw);
+void rtl_debugfs_add_topdir(void);
+void rtl_debugfs_remove_topdir(void);
+#else
+#define rtl_debug_add_one(hw)
+#define rtl_debug_remove_one(hw)
+#define rtl_debugfs_add_topdir()
+#define rtl_debugfs_remove_topdir()
 #endif
 #endif

drivers/net/wireless/realtek/rtlwifi/pci.c

@@ -2309,6 +2309,9 @@ int rtl_pci_probe(struct pci_dev *pdev,
 	}
 	rtlpriv->mac80211.mac80211_registered = 1;
 
+	/* add for debug */
+	rtl_debug_add_one(hw);
+
 	/*init rfkill */
 	rtl_init_rfkill(hw);	/* Init PCI sw */
 
@@ -2357,6 +2360,9 @@ void rtl_pci_disconnect(struct pci_dev *pdev)
 	wait_for_completion(&rtlpriv->firmware_loading_complete);
 	clear_bit(RTL_STATUS_INTERFACE_START, &rtlpriv->status);
 
+	/* remove form debug */
+	rtl_debug_remove_one(hw);
+
 	/*ieee80211_unregister_hw will call ops_stop */
 	if (rtlmac->mac80211_registered == 1) {
 		ieee80211_unregister_hw(hw);

drivers/net/wireless/realtek/rtlwifi/wifi.h

@@ -2381,6 +2381,12 @@ struct rtl_works {
 	struct work_struct fill_h2c_cmd;
 };
 
+struct rtl_debug {
+	/* add for debug */
+	struct dentry *debugfs_dir;
+	char debugfs_name[20];
+};
+
 #define MIMO_PS_STATIC			0
 #define MIMO_PS_DYNAMIC			1
 #define MIMO_PS_NOLIMIT			3
@@ -2575,6 +2581,8 @@ struct rtl_btc_ops {
 	bool (*btc_is_bt_disabled) (struct rtl_priv *rtlpriv);
 	void (*btc_special_packet_notify)(struct rtl_priv *rtlpriv,
 					  u8 pkt_type);
+	void (*btc_display_bt_coex_info)(struct rtl_priv *rtlpriv,
+					 struct seq_file *m);
 	void (*btc_record_pwr_mode)(struct rtl_priv *rtlpriv, u8 *buf, u8 len);
 	u8   (*btc_get_lps_val)(struct rtl_priv *rtlpriv);
 	u8   (*btc_get_rpwm_val)(struct rtl_priv *rtlpriv);
@@ -2649,6 +2657,7 @@ struct rtl_priv {
 	/* c2hcmd list for kthread level access */
 	struct list_head c2hcmd_list;
 
+	struct rtl_debug dbg;
 	int max_fw_size;
 
 	/*