hwmon: (pmbus) Use _pmbus_read_byte_data with callback

Some of the pmbus core functions uses pmbus_read_byte_data, which does
not support driver callbacks for chip specific write operations. This
could potentially influence some specific regulator chips that for
example need a time delay before each data access.

Lets use _pmbus_read_byte_data with callback check.
Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>
Link: https://lore.kernel.org/r/20220428144039.2464667-3-marten.lindahl@axis.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pmbus/pmbus_core.c

@@ -294,6 +294,24 @@ static int _pmbus_write_byte_data(struct i2c_client *client, int page, int reg,
 	return pmbus_write_byte_data(client, page, reg, value);
 }
 
+/*
+ * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
+ * a device specific mapping function exists and calls it if necessary.
+ */
+static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	struct pmbus_data *data = i2c_get_clientdata(client);
+	const struct pmbus_driver_info *info = data->info;
+	int status;
+
+	if (info->read_byte_data) {
+		status = info->read_byte_data(client, page, reg);
+		if (status != -ENODATA)
+			return status;
+	}
+	return pmbus_read_byte_data(client, page, reg);
+}
+
 int pmbus_update_fan(struct i2c_client *client, int page, int id,
 		     u8 config, u8 mask, u16 command)
 {
@@ -301,7 +319,7 @@ int pmbus_update_fan(struct i2c_client *client, int page, int id,
 	int rv;
 	u8 to;
 
-	from = pmbus_read_byte_data(client, page,
+	from = _pmbus_read_byte_data(client, page,
 				    pmbus_fan_config_registers[id]);
 	if (from < 0)
 		return from;
@@ -408,7 +426,7 @@ int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
 	unsigned int tmp;
 	int rv;
 
-	rv = pmbus_read_byte_data(client, page, reg);
+	rv = _pmbus_read_byte_data(client, page, reg);
 	if (rv < 0)
 		return rv;
 
@@ -421,24 +439,6 @@ int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
 }
 EXPORT_SYMBOL_NS_GPL(pmbus_update_byte_data, PMBUS);
 
-/*
- * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
- * a device specific mapping function exists and calls it if necessary.
- */
-static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
-{
-	struct pmbus_data *data = i2c_get_clientdata(client);
-	const struct pmbus_driver_info *info = data->info;
-	int status;
-
-	if (info->read_byte_data) {
-		status = info->read_byte_data(client, page, reg);
-		if (status != -ENODATA)
-			return status;
-	}
-	return pmbus_read_byte_data(client, page, reg);
-}
-
 static struct pmbus_sensor *pmbus_find_sensor(struct pmbus_data *data, int page,
 					      int reg)
 {
@@ -473,7 +473,7 @@ static int pmbus_get_fan_rate(struct i2c_client *client, int page, int id,
 		return s->data;
 	}
 
-	config = pmbus_read_byte_data(client, page,
+	config = _pmbus_read_byte_data(client, page,
 				      pmbus_fan_config_registers[id]);
 	if (config < 0)
 		return config;
@@ -2417,7 +2417,7 @@ static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
 	int ret;
 
 	mutex_lock(&data->update_lock);
-	ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
+	ret = _pmbus_read_byte_data(client, page, PMBUS_OPERATION);
 	mutex_unlock(&data->update_lock);
 
 	if (ret < 0)
@@ -2516,7 +2516,7 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
 		if (!(func & cat->func))
 			continue;
 
-		status = pmbus_read_byte_data(client, page, cat->reg);
+		status = _pmbus_read_byte_data(client, page, cat->reg);
 		if (status < 0) {
 			mutex_unlock(&data->update_lock);
 			return status;