mlxsw: core_hwmon: Split temperature querying from show functions

mlxsw_hwmon_module_temp_show(), mlxsw_hwmon_module_temp_critical_show()
and mlxsw_hwmon_module_temp_emergency_show() query the relevant
temperature from firmware and fill the value in provided buffers.

Split the temperature querying functionality to individual get()
functions and call them from the show() functions.

The get() functions will be used by subsequent patches in the set.
Signed-off-by: Amit Cohen <amitc@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/core_hwmon.c

@@ -205,25 +205,39 @@ static ssize_t mlxsw_hwmon_pwm_store(struct device *dev,
 	return len;
 }
 
-static ssize_t mlxsw_hwmon_module_temp_show(struct device *dev,
+static int mlxsw_hwmon_module_temp_get(struct device *dev,
 				       struct device_attribute *attr,
-					    char *buf)
+				       int *p_temp)
 {
 	struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 			container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 	struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
 	char mtmp_pl[MLXSW_REG_MTMP_LEN];
 	u8 module;
-	int temp;
 	int err;
 
 	module = mlwsw_hwmon_attr->type_index - mlxsw_hwmon->sensor_count;
 	mlxsw_reg_mtmp_pack(mtmp_pl, MLXSW_REG_MTMP_MODULE_INDEX_MIN + module,
 			    false, false);
 	err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mtmp), mtmp_pl);
+	if (err) {
+		dev_err(dev, "Failed to query module temperature\n");
+		return err;
+	}
+	mlxsw_reg_mtmp_unpack(mtmp_pl, p_temp, NULL, NULL);
+
+	return 0;
+}
+
+static ssize_t mlxsw_hwmon_module_temp_show(struct device *dev,
+					    struct device_attribute *attr,
+					    char *buf)
+{
+	int err, temp;
+
+	err = mlxsw_hwmon_module_temp_get(dev, attr, &temp);
 	if (err)
 		return err;
-	mlxsw_reg_mtmp_unpack(mtmp_pl, &temp, NULL, NULL);
 
 	return sprintf(buf, "%d\n", temp);
 }
@@ -270,48 +284,72 @@ static ssize_t mlxsw_hwmon_module_temp_fault_show(struct device *dev,
 	return sprintf(buf, "%u\n", fault);
 }
 
-static ssize_t
-mlxsw_hwmon_module_temp_critical_show(struct device *dev,
-				      struct device_attribute *attr, char *buf)
+static int mlxsw_hwmon_module_temp_critical_get(struct device *dev,
+						struct device_attribute *attr,
+						int *p_temp)
 {
 	struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 			container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 	struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
-	int temp;
 	u8 module;
 	int err;
 
 	module = mlwsw_hwmon_attr->type_index - mlxsw_hwmon->sensor_count;
 	err = mlxsw_env_module_temp_thresholds_get(mlxsw_hwmon->core, module,
-						   SFP_TEMP_HIGH_WARN, &temp);
+						   SFP_TEMP_HIGH_WARN, p_temp);
 	if (err) {
 		dev_err(dev, "Failed to query module temperature thresholds\n");
 		return err;
 	}
 
-	return sprintf(buf, "%u\n", temp);
+	return 0;
 }
 
 static ssize_t
-mlxsw_hwmon_module_temp_emergency_show(struct device *dev,
+mlxsw_hwmon_module_temp_critical_show(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	int err, temp;
+
+	err = mlxsw_hwmon_module_temp_critical_get(dev, attr, &temp);
+	if (err)
+		return err;
+
+	return sprintf(buf, "%u\n", temp);
+}
+
+static int mlxsw_hwmon_module_temp_emergency_get(struct device *dev,
 						 struct device_attribute *attr,
-				       char *buf)
+						 int *p_temp)
 {
 	struct mlxsw_hwmon_attr *mlwsw_hwmon_attr =
 			container_of(attr, struct mlxsw_hwmon_attr, dev_attr);
 	struct mlxsw_hwmon *mlxsw_hwmon = mlwsw_hwmon_attr->hwmon;
 	u8 module;
-	int temp;
 	int err;
 
 	module = mlwsw_hwmon_attr->type_index - mlxsw_hwmon->sensor_count;
 	err = mlxsw_env_module_temp_thresholds_get(mlxsw_hwmon->core, module,
-						   SFP_TEMP_HIGH_ALARM, &temp);
+						   SFP_TEMP_HIGH_ALARM, p_temp);
 	if (err) {
 		dev_err(dev, "Failed to query module temperature thresholds\n");
 		return err;
 	}
 
+	return 0;
+}
+
+static ssize_t
+mlxsw_hwmon_module_temp_emergency_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	int err, temp;
+
+	err = mlxsw_hwmon_module_temp_emergency_get(dev, attr, &temp);
+	if (err)
+		return err;
+
 	return sprintf(buf, "%u\n", temp);
 }