staging: rtlwifi: Improve debugging by using debugfs

The changes in this commit are also being sent to the main rtlwifi
drivers in wireless-next; however, these changes will also be useful for
any debugging of r8822be before it gets moved into the main tree.

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.

We use seq_file to replace RT_TRACE to dump status, then we can use 'cat'
to access btcoex's status through debugfs.
(i.e. /sys/kernel/debug/rtlwifi/00-11-22-33-44-55-66/btcoex)
Other related changes are
1. implement btc_disp_dbg_msg() to access btcoex's common status.
2. remove obsolete field bt_exist
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Yan-Hsuan Chuang <yhchuang@realtek.com>
Cc: Birming Chiu <birming@realtek.com>
Cc: Shaofu <shaofu@realtek.com>
Cc: Steven Ting <steventing@realtek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtlwifi/debug.c

@@ -80,9 +80,11 @@ void _rtl_dbg_print_data(struct rtl_priv *rtlpriv, u64 comp, int level,
 	}
 }
 
-struct rtl_debgufs_priv {
+struct rtl_debugfs_priv {
 	struct rtl_priv *rtlpriv;
-	int (*cb)(struct seq_file *m, void *v);
+	int (*cb_read)(struct seq_file *m, void *v);
+	ssize_t (*cb_write)(struct file *filp, const char __user *buffer,
+			    size_t count, loff_t *loff);
 	u32 cb_data;
 };
 
@@ -90,9 +92,9 @@ static struct dentry *debugfs_topdir;
 
 static int rtl_debug_get_common(struct seq_file *m, void *v)
 {
-	struct rtl_debgufs_priv *debugfs_priv = m->private;
+	struct rtl_debugfs_priv *debugfs_priv = m->private;
 
-	return debugfs_priv->cb(m, v);
+	return debugfs_priv->cb_read(m, v);
 }
 
 static int dl_debug_open_common(struct inode *inode, struct file *file)
@@ -109,7 +111,7 @@ static const struct file_operations file_ops_common = {
 
 static int rtl_debug_get_mac_page(struct seq_file *m, void *v)
 {
-	struct rtl_debgufs_priv *debugfs_priv = m->private;
+	struct rtl_debugfs_priv *debugfs_priv = m->private;
 	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
 	u32 page = debugfs_priv->cb_data;
 	int i, n;
@@ -126,8 +128,8 @@ static int rtl_debug_get_mac_page(struct seq_file *m, void *v)
 }
 
 #define RTL_DEBUG_IMPL_MAC_SERIES(page, addr)		\
-struct rtl_debgufs_priv rtl_debug_priv_mac_ ##page = {	\
-	.cb = rtl_debug_get_mac_page,			\
+struct rtl_debugfs_priv rtl_debug_priv_mac_ ##page = {	\
+	.cb_read = rtl_debug_get_mac_page,		\
 	.cb_data = addr,				\
 }
 
@@ -150,7 +152,7 @@ RTL_DEBUG_IMPL_MAC_SERIES(17, 0x1700);
 
 static int rtl_debug_get_bb_page(struct seq_file *m, void *v)
 {
-	struct rtl_debgufs_priv *debugfs_priv = m->private;
+	struct rtl_debugfs_priv *debugfs_priv = m->private;
 	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
 	struct ieee80211_hw *hw = rtlpriv->hw;
 	u32 page = debugfs_priv->cb_data;
@@ -168,8 +170,8 @@ static int rtl_debug_get_bb_page(struct seq_file *m, void *v)
 }
 
 #define RTL_DEBUG_IMPL_BB_SERIES(page, addr)		\
-struct rtl_debgufs_priv rtl_debug_priv_bb_ ##page = {	\
-	.cb = rtl_debug_get_bb_page,			\
+struct rtl_debugfs_priv rtl_debug_priv_bb_ ##page = {	\
+	.cb_read = rtl_debug_get_bb_page,		\
 	.cb_data = addr,				\
 }
 
@@ -192,7 +194,7 @@ RTL_DEBUG_IMPL_BB_SERIES(1f, 0x1f00);
 
 static int rtl_debug_get_reg_rf(struct seq_file *m, void *v)
 {
-	struct rtl_debgufs_priv *debugfs_priv = m->private;
+	struct rtl_debugfs_priv *debugfs_priv = m->private;
 	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
 	struct ieee80211_hw *hw = rtlpriv->hw;
 	enum radio_path rfpath = debugfs_priv->cb_data;
@@ -215,8 +217,8 @@ static int rtl_debug_get_reg_rf(struct seq_file *m, void *v)
 }
 
 #define RTL_DEBUG_IMPL_RF_SERIES(page, addr)		\
-struct rtl_debgufs_priv rtl_debug_priv_rf_ ##page = {	\
-	.cb = rtl_debug_get_reg_rf,			\
+struct rtl_debugfs_priv rtl_debug_priv_rf_ ##page = {	\
+	.cb_read = rtl_debug_get_reg_rf,		\
 	.cb_data = addr,				\
 }
 
@@ -225,7 +227,7 @@ RTL_DEBUG_IMPL_RF_SERIES(b, RF90_PATH_B);
 
 static int rtl_debug_get_cam_register(struct seq_file *m, void *v)
 {
-	struct rtl_debgufs_priv *debugfs_priv = m->private;
+	struct rtl_debugfs_priv *debugfs_priv = m->private;
 	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
 	int start = debugfs_priv->cb_data;
 	u32 target_cmd = 0;
@@ -270,8 +272,8 @@ static int rtl_debug_get_cam_register(struct seq_file *m, void *v)
 }
 
 #define RTL_DEBUG_IMPL_CAM_SERIES(page, addr)		\
-struct rtl_debgufs_priv rtl_debug_priv_cam_ ##page = {	\
-	.cb = rtl_debug_get_cam_register,	\
+struct rtl_debugfs_priv rtl_debug_priv_cam_ ##page = {	\
+	.cb_read = rtl_debug_get_cam_register,		\
 	.cb_data = addr,				\
 }
 
@@ -281,7 +283,7 @@ RTL_DEBUG_IMPL_CAM_SERIES(3, 22);
 
 static int rtl_debug_get_btcoex(struct seq_file *m, void *v)
 {
-	struct rtl_debgufs_priv *debugfs_priv = m->private;
+	struct rtl_debugfs_priv *debugfs_priv = m->private;
 	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
 
 	if (rtlpriv->cfg->ops->get_btc_status())
@@ -293,8 +295,8 @@ static int rtl_debug_get_btcoex(struct seq_file *m, void *v)
 	return 0;
 }
 
-static struct rtl_debgufs_priv rtl_debug_priv_btcoex = {
-	.cb = rtl_debug_get_btcoex,
+static struct rtl_debugfs_priv rtl_debug_priv_btcoex = {
+	.cb_read = rtl_debug_get_btcoex,
 	.cb_data = 0,
 };
 
@@ -302,18 +304,15 @@ static ssize_t rtl_debugfs_set_write_reg(struct file *filp,
 					 const char __user *buffer,
 					 size_t count, loff_t *loff)
 {
-	struct rtl_debgufs_priv *debugfs_priv = filp->private_data;
+	struct rtl_debugfs_priv *debugfs_priv = filp->private_data;
 	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
-	struct ieee80211_hw *hw = rtlpriv->hw;
 	char tmp[32 + 1];
 	int tmp_len;
 	u32 addr, val, len;
 	int num;
 
-	if (count < 3) {
-		/*printk("argument size is less than 3\n");*/
+	if (count < 3)
 		return -EFAULT;
-	}
 
 	tmp_len = (count > sizeof(tmp) - 1 ? sizeof(tmp) - 1 : count);
 
@@ -322,57 +321,11 @@ static ssize_t rtl_debugfs_set_write_reg(struct file *filp,
 
 	tmp[tmp_len] = '\0';
 
-	/* write H2C */
-	if (!strncmp(tmp, "h2c", 3)) {
-		u8 h2c_len, h2c_data_packed[8];
-		int h2c_data[8];	/* idx 0: cmd */
-		int i;
-
-		h2c_len = sscanf(tmp + 3, "%X %X %X %X %X %X %X %X",
-				 &h2c_data[0], &h2c_data[1],
-				 &h2c_data[2], &h2c_data[3],
-				 &h2c_data[4], &h2c_data[5],
-				 &h2c_data[6], &h2c_data[7]);
-
-		if (h2c_len <= 0)
-			return count;
-
-		for (i = 0; i < h2c_len; i++)
-			h2c_data_packed[i] = (u8)h2c_data[i];
-
-		rtlpriv->cfg->ops->fill_h2c_cmd(hw, h2c_data_packed[0],
-						h2c_len - 1,
-						&h2c_data_packed[1]);
-
-		return count;
-	}
-
-	/* write RF register */
-	if (!strncmp(tmp, "rf", 2)) {
-		int path;
-		u32 addr, bitmask, data;
-
-		num = sscanf(tmp + 2, "%X %X %X %X",
-			     &path, &addr, &bitmask, &data);
-
-		if (num != 4) {
-			RT_TRACE(rtlpriv, COMP_ERR, DBG_DMESG,
-				 "Format is <path> <addr> <mask> <data>\n");
-			return count;
-		}
-
-		rtl_set_rfreg(hw, path, addr, bitmask, data);
-
-		return count;
-	}
-
 	/* write BB/MAC register */
-	num  = sscanf(tmp, "%x %x %x", &addr, &val, &len);
+	num = sscanf(tmp, "%x %x %x", &addr, &val, &len);
 
-	if (num !=  3) {
-		/*printk("invalid write_reg parameter!\n");*/
+	if (num !=  3)
 		return count;
-	}
 
 	switch (len) {
 	case 1:
@@ -392,27 +345,115 @@ static ssize_t rtl_debugfs_set_write_reg(struct file *filp,
 	return count;
 }
 
-static int rtl_debugfs_open(struct inode *inode, struct file *filp)
+static struct rtl_debugfs_priv rtl_debug_priv_write_reg = {
+	.cb_write = rtl_debugfs_set_write_reg,
+};
+
+static ssize_t rtl_debugfs_set_write_h2c(struct file *filp,
+					 const char __user *buffer,
+					 size_t count, loff_t *loff)
 {
-	filp->private_data = inode->i_private;
+	struct rtl_debugfs_priv *debugfs_priv = filp->private_data;
+	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
+	struct ieee80211_hw *hw = rtlpriv->hw;
+	char tmp[32 + 1];
+	int tmp_len;
+	u8 h2c_len, h2c_data_packed[8];
+	int h2c_data[8];	/* idx 0: cmd */
+	int i;
 
-	return 0;
+	if (count < 3)
+		return -EFAULT;
+
+	tmp_len = (count > sizeof(tmp) - 1 ? sizeof(tmp) - 1 : count);
+
+	if (!buffer || copy_from_user(tmp, buffer, tmp_len))
+		return count;
+
+	tmp[tmp_len] = '\0';
+
+	h2c_len = sscanf(tmp, "%X %X %X %X %X %X %X %X",
+			 &h2c_data[0], &h2c_data[1],
+			 &h2c_data[2], &h2c_data[3],
+			 &h2c_data[4], &h2c_data[5],
+			 &h2c_data[6], &h2c_data[7]);
+
+	if (h2c_len <= 0)
+		return count;
+
+	for (i = 0; i < h2c_len; i++)
+		h2c_data_packed[i] = (u8)h2c_data[i];
+
+	rtlpriv->cfg->ops->fill_h2c_cmd(hw, h2c_data_packed[0],
+					h2c_len - 1,
+					&h2c_data_packed[1]);
+
+	return count;
+}
+
+static struct rtl_debugfs_priv rtl_debug_priv_write_h2c = {
+	.cb_write = rtl_debugfs_set_write_h2c,
+};
+
+static ssize_t rtl_debugfs_set_write_rfreg(struct file *filp,
+					   const char __user *buffer,
+					    size_t count, loff_t *loff)
+{
+	struct rtl_debugfs_priv *debugfs_priv = filp->private_data;
+	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
+	struct ieee80211_hw *hw = rtlpriv->hw;
+	char tmp[32 + 1];
+	int tmp_len;
+	int num;
+	int path;
+	u32 addr, bitmask, data;
+
+	if (count < 3)
+		return -EFAULT;
+
+	tmp_len = (count > sizeof(tmp) - 1 ? sizeof(tmp) - 1 : count);
+
+	if (!buffer || copy_from_user(tmp, buffer, tmp_len))
+		return count;
+
+	tmp[tmp_len] = '\0';
+
+	num = sscanf(tmp, "%X %X %X %X",
+		     &path, &addr, &bitmask, &data);
+
+	if (num != 4) {
+		RT_TRACE(rtlpriv, COMP_ERR, DBG_DMESG,
+			 "Format is <path> <addr> <mask> <data>\n");
+		return count;
+	}
+
+	rtl_set_rfreg(hw, path, addr, bitmask, data);
+
+	return count;
 }
 
+static struct rtl_debugfs_priv rtl_debug_priv_write_rfreg = {
+	.cb_write = rtl_debugfs_set_write_rfreg,
+};
+
 static int rtl_debugfs_close(struct inode *inode, struct file *filp)
 {
 	return 0;
 }
 
-static struct rtl_debgufs_priv rtl_debug_priv_write_reg = {
-	.cb = NULL,
-	.cb_data = 0,
-};
+static ssize_t rtl_debugfs_common_write(struct file *filp,
+					const char __user *buffer,
+					size_t count, loff_t *loff)
+{
+	struct rtl_debugfs_priv *debugfs_priv = filp->private_data;
+
+	return debugfs_priv->cb_write(filp, buffer, count, loff);
+}
 
-static const struct file_operations file_ops_write_reg = {
+static const struct file_operations file_ops_common_write = {
 	.owner = THIS_MODULE,
-	.write = rtl_debugfs_set_write_reg,
-	.open = rtl_debugfs_open,
+	.write = rtl_debugfs_common_write,
+	.open = simple_open,
 	.release = rtl_debugfs_close,
 };
 
@@ -420,7 +461,7 @@ static ssize_t rtl_debugfs_phydm_cmd(struct file *filp,
 				     const char __user *buffer,
 				     size_t count, loff_t *loff)
 {
-	struct rtl_debgufs_priv *debugfs_priv = filp->private_data;
+	struct rtl_debugfs_priv *debugfs_priv = filp->private_data;
 	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
 
 	char tmp[64];
@@ -444,7 +485,7 @@ static ssize_t rtl_debugfs_phydm_cmd(struct file *filp,
 
 static int rtl_debug_get_phydm_cmd(struct seq_file *m, void *v)
 {
-	struct rtl_debgufs_priv *debugfs_priv = m->private;
+	struct rtl_debugfs_priv *debugfs_priv = m->private;
 	struct rtl_priv *rtlpriv = debugfs_priv->rtlpriv;
 
 	if (rtlpriv->dbg.msg_buf)
@@ -456,7 +497,7 @@ static int rtl_debug_get_phydm_cmd(struct seq_file *m, void *v)
 static int rtl_debugfs_open_rw(struct inode *inode, struct file *filp)
 {
 	if (filp->f_mode & FMODE_READ)
-		single_open(filp, rtl_debug_get_phydm_cmd, inode->i_private);
+		single_open(filp, rtl_debug_get_common, inode->i_private);
 	else
 		filp->private_data = inode->i_private;
 
@@ -471,18 +512,19 @@ static int rtl_debugfs_close_rw(struct inode *inode, struct file *filp)
 	return 0;
 }
 
-static struct rtl_debgufs_priv rtl_debug_priv_phydm_cmd = {
-	.cb = NULL,
+static struct rtl_debugfs_priv rtl_debug_priv_phydm_cmd = {
+	.cb_read = rtl_debug_get_phydm_cmd,
+	.cb_write = rtl_debugfs_phydm_cmd,
 	.cb_data = 0,
 };
 
-static const struct file_operations file_ops_phydm_cmd = {
+static const struct file_operations file_ops_common_rw = {
 	.owner = THIS_MODULE,
 	.open = rtl_debugfs_open_rw,
 	.release = rtl_debugfs_close_rw,
 	.read = seq_read,
 	.llseek = seq_lseek,
-	.write = rtl_debugfs_phydm_cmd,
+	.write = rtl_debugfs_common_write,
 };
 
 #define RTL_DEBUGFS_ADD_CORE(name, mode, fopname)			   \
@@ -499,9 +541,9 @@ static const struct file_operations file_ops_phydm_cmd = {
 #define RTL_DEBUGFS_ADD(name)						   \
 		RTL_DEBUGFS_ADD_CORE(name, S_IFREG | 0444, common)
 #define RTL_DEBUGFS_ADD_W(name)						   \
-		RTL_DEBUGFS_ADD_CORE(name, S_IFREG | 0222, write_reg)
+		RTL_DEBUGFS_ADD_CORE(name, S_IFREG | 0222, common_write)
 #define RTL_DEBUGFS_ADD_RW(name)					   \
-		RTL_DEBUGFS_ADD_CORE(name, S_IFREG | 0666, phydm_cmd)
+		RTL_DEBUGFS_ADD_CORE(name, S_IFREG | 0666, common_rw)
 
 void rtl_debug_add_one(struct ieee80211_hw *hw)
 {
@@ -565,6 +607,8 @@ void rtl_debug_add_one(struct ieee80211_hw *hw)
 	RTL_DEBUGFS_ADD(btcoex);
 
 	RTL_DEBUGFS_ADD_W(write_reg);
+	RTL_DEBUGFS_ADD_W(write_h2c);
+	RTL_DEBUGFS_ADD_W(write_rfreg);
 
 	RTL_DEBUGFS_ADD_RW(phydm_cmd);
 }