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>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index 4013394fac33..c1833a501be4 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/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);