thermal: intel: int340x: Add production mode attribute

It is possible that the system manufacturer locks down thermal tuning
beyond what is usually done on the given platform. In that case user
space calibration tools should not try to adjust the thermal
configuration of the system.

To allow user space to check if that is the case, add a new sysfs
attribute "production_mode" that will be present when the ACPI DCFG
method is present under the INT3400 device object in the ACPI Namespace.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
index c1fc4a78607c..d0295123cc3e 100644
--- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
+++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
@@ -60,6 +60,7 @@ struct int3400_thermal_priv {
 	int odvp_count;
 	int *odvp;
 	u32 os_uuid_mask;
+	int production_mode;
 	struct odvp_attr *odvp_attrs;
 };
 
@@ -309,6 +310,44 @@ end:
 	return result;
 }
 
+static ssize_t production_mode_show(struct device *dev, struct device_attribute *attr,
+				     char *buf)
+{
+	struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", priv->production_mode);
+}
+
+static DEVICE_ATTR_RO(production_mode);
+
+static int production_mode_init(struct int3400_thermal_priv *priv)
+{
+	unsigned long long mode;
+	acpi_status status;
+	int ret;
+
+	priv->production_mode = -1;
+
+	status = acpi_evaluate_integer(priv->adev->handle, "DCFG", NULL, &mode);
+	/* If the method is not present, this is not an error */
+	if (ACPI_FAILURE(status))
+		return 0;
+
+	ret = sysfs_create_file(&priv->pdev->dev.kobj, &dev_attr_production_mode.attr);
+	if (ret)
+		return ret;
+
+	priv->production_mode = mode;
+
+	return 0;
+}
+
+static void production_mode_exit(struct int3400_thermal_priv *priv)
+{
+	if (priv->production_mode >= 0)
+		sysfs_remove_file(&priv->pdev->dev.kobj, &dev_attr_production_mode.attr);
+}
+
 static ssize_t odvp_show(struct device *dev, struct device_attribute *attr,
 			 char *buf)
 {
@@ -604,8 +643,15 @@ static int int3400_thermal_probe(struct platform_device *pdev)
 	if (result)
 		goto free_sysfs;
 
+	result = production_mode_init(priv);
+	if (result)
+		goto free_notify;
+
 	return 0;
 
+free_notify:
+	acpi_remove_notify_handler(priv->adev->handle, ACPI_DEVICE_NOTIFY,
+				   int3400_notify);
 free_sysfs:
 	cleanup_odvp(priv);
 	if (!ZERO_OR_NULL_PTR(priv->data_vault)) {
@@ -632,6 +678,8 @@ static int int3400_thermal_remove(struct platform_device *pdev)
 {
 	struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 
+	production_mode_exit(priv);
+
 	acpi_remove_notify_handler(
 			priv->adev->handle, ACPI_DEVICE_NOTIFY,
 			int3400_notify);