mt76: overwrite default reg_ops if necessary

Introduce mt76_register_debugfs_fops routine in order to
define per-driver regs file operations and make sure the
device is up before reading or writing its registers

Fixes: 1d8efc74 ("mt76: mt7921: introduce Runtime PM support")
Fixes: de5ff3c9 ("mt76: mt7615: introduce pm_power_save delayed work")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/debugfs.c

@@ -116,8 +116,11 @@ static int mt76_read_rate_txpower(struct seq_file *s, void *data)
 	return 0;
 }
 
-struct dentry *mt76_register_debugfs(struct mt76_dev *dev)
+struct dentry *
+mt76_register_debugfs_fops(struct mt76_dev *dev,
+			   const struct file_operations *ops)
 {
+	const struct file_operations *fops = ops ? ops : &fops_regval;
 	struct dentry *dir;
 
 	dir = debugfs_create_dir("mt76", dev->hw->wiphy->debugfsdir);
@@ -126,8 +129,7 @@ struct dentry *mt76_register_debugfs(struct mt76_dev *dev)
 
 	debugfs_create_u8("led_pin", 0600, dir, &dev->led_pin);
 	debugfs_create_u32("regidx", 0600, dir, &dev->debugfs_reg);
-	debugfs_create_file_unsafe("regval", 0600, dir, dev,
-				   &fops_regval);
+	debugfs_create_file_unsafe("regval", 0600, dir, dev, fops);
 	debugfs_create_file_unsafe("napi_threaded", 0600, dir, dev,
 				   &fops_napi_threaded);
 	debugfs_create_blob("eeprom", 0400, dir, &dev->eeprom);
@@ -140,4 +142,4 @@ struct dentry *mt76_register_debugfs(struct mt76_dev *dev)
 
 	return dir;
 }
-EXPORT_SYMBOL_GPL(mt76_register_debugfs);
+EXPORT_SYMBOL_GPL(mt76_register_debugfs_fops);

drivers/net/wireless/mediatek/mt76/mt76.h

@@ -879,7 +879,13 @@ struct mt76_phy *mt76_alloc_phy(struct mt76_dev *dev, unsigned int size,
 int mt76_register_phy(struct mt76_phy *phy, bool vht,
 		      struct ieee80211_rate *rates, int n_rates);
 
-struct dentry *mt76_register_debugfs(struct mt76_dev *dev);
+struct dentry *mt76_register_debugfs_fops(struct mt76_dev *dev,
+					  const struct file_operations *ops);
+static inline struct dentry *mt76_register_debugfs(struct mt76_dev *dev)
+{
+	return mt76_register_debugfs_fops(dev, NULL);
+}
+
 int mt76_queues_read(struct seq_file *s, void *data);
 void mt76_seq_puts_array(struct seq_file *file, const char *str,
 			 s8 *val, int len);

drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c

@@ -2,6 +2,33 @@
 
 #include "mt7615.h"
 
+static int
+mt7615_reg_set(void *data, u64 val)
+{
+	struct mt7615_dev *dev = data;
+
+	mt7615_mutex_acquire(dev);
+	mt76_wr(dev, dev->mt76.debugfs_reg, val);
+	mt7615_mutex_release(dev);
+
+	return 0;
+}
+
+static int
+mt7615_reg_get(void *data, u64 *val)
+{
+	struct mt7615_dev *dev = data;
+
+	mt7615_mutex_acquire(dev);
+	*val = mt76_rr(dev, dev->mt76.debugfs_reg);
+	mt7615_mutex_release(dev);
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_regval, mt7615_reg_get, mt7615_reg_set,
+			 "0x%08llx\n");
+
 static int
 mt7615_radar_pattern_set(void *data, u64 val)
 {
@@ -506,7 +533,7 @@ int mt7615_init_debugfs(struct mt7615_dev *dev)
 {
 	struct dentry *dir;
 
-	dir = mt76_register_debugfs(&dev->mt76);
+	dir = mt76_register_debugfs_fops(&dev->mt76, &fops_regval);
 	if (!dir)
 		return -ENOMEM;
 

drivers/net/wireless/mediatek/mt76/mt7921/debugfs.c

@@ -4,6 +4,32 @@
 #include "mt7921.h"
 #include "eeprom.h"
 
+static int
+mt7921_reg_set(void *data, u64 val)
+{
+	struct mt7921_dev *dev = data;
+
+	mt7921_mutex_acquire(dev);
+	mt76_wr(dev, dev->mt76.debugfs_reg, val);
+	mt7921_mutex_release(dev);
+
+	return 0;
+}
+
+static int
+mt7921_reg_get(void *data, u64 *val)
+{
+	struct mt7921_dev *dev = data;
+
+	mt7921_mutex_acquire(dev);
+	*val = mt76_rr(dev, dev->mt76.debugfs_reg);
+	mt7921_mutex_release(dev);
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_regval, mt7921_reg_get, mt7921_reg_set,
+			 "0x%08llx\n");
 static int
 mt7921_fw_debug_set(void *data, u64 val)
 {
@@ -381,7 +407,7 @@ int mt7921_init_debugfs(struct mt7921_dev *dev)
 {
 	struct dentry *dir;
 
-	dir = mt76_register_debugfs(&dev->mt76);
+	dir = mt76_register_debugfs_fops(&dev->mt76, &fops_regval);
 	if (!dir)
 		return -ENOMEM;