hwmon: (dell-smm) Introduce helper function for data init

In the future, multiple SMM calling backends will exist,
with each backend being required to initialize its data.
Introduce a helper function for this so the code necessary
to initialize dell_smm_data is not duplicated between
different backends.

Tested-by: <serverror@serverror.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20231123004820.50635-7-W_Armin@gmx.deSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/dell-smm-hwmon.c

@@ -623,6 +623,11 @@ static void __init i8k_init_procfs(struct device *dev)
 {
 	struct dell_smm_data *data = dev_get_drvdata(dev);
 
+	strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
+		sizeof(data->bios_version));
+	strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
+		sizeof(data->bios_machineid));
+
 	/* Only register exit function if creation was successful */
 	if (proc_create_data("i8k", 0, NULL, &i8k_proc_ops, data))
 		devm_add_action_or_reset(dev, i8k_exit_procfs, NULL);
@@ -1078,6 +1083,26 @@ static int __init dell_smm_init_hwmon(struct device *dev)
 	return PTR_ERR_OR_ZERO(dell_smm_hwmon_dev);
 }
 
+static int __init dell_smm_init_data(struct device *dev, const struct dell_smm_ops *ops)
+{
+	struct dell_smm_data *data;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	mutex_init(&data->i8k_mutex);
+	dev_set_drvdata(dev, data);
+
+	data->ops = ops;
+	/* All options must not be 0 */
+	data->i8k_fan_mult = fan_mult ? : I8K_FAN_MULT;
+	data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH;
+	data->i8k_pwm_mult = DIV_ROUND_UP(255, data->i8k_fan_max);
+
+	return 0;
+}
+
 static const struct dmi_system_id i8k_dmi_table[] __initconst = {
 	{
 		.ident = "Dell G5 5590",
@@ -1386,26 +1411,11 @@ static const struct dmi_system_id i8k_whitelist_fan_control[] __initconst = {
 
 static int __init dell_smm_probe(struct platform_device *pdev)
 {
-	struct dell_smm_data *data;
 	int ret;
 
-	data = devm_kzalloc(&pdev->dev, sizeof(struct dell_smm_data), GFP_KERNEL);
-	if (!data)
-		return -ENOMEM;
-
-	mutex_init(&data->i8k_mutex);
-	platform_set_drvdata(pdev, data);
-	data->ops = &i8k_smm_ops;
-
-	strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),
-		sizeof(data->bios_version));
-	strscpy(data->bios_machineid, i8k_get_dmi_data(DMI_PRODUCT_SERIAL),
-		sizeof(data->bios_machineid));
-
-	/* All options must not be 0 */
-	data->i8k_fan_mult = fan_mult ? : I8K_FAN_MULT;
-	data->i8k_fan_max = fan_max ? : I8K_FAN_HIGH;
-	data->i8k_pwm_mult = DIV_ROUND_UP(255, data->i8k_fan_max);
+	ret = dell_smm_init_data(&pdev->dev, &i8k_smm_ops);
+	if (ret < 0)
+		return ret;
 
 	ret = dell_smm_init_hwmon(&pdev->dev);
 	if (ret)