[PATCH] thermal: int340x_thermal: Add production mode attribute

[Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>]

It is possible that system manufacturer locks further thermal tuning. In
this case user space calibration tools should not try to adjust thermal
configuration.

Add an attribute "production_mode". This attribute is only present when
the ACPI DCFG method is present under INT3400 device scope.

When DCFG evaluates to non 0, user space configuration tools should exit.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 .../driver-api/thermal/intel_dptf.rst         |  4 ++
 .../intel/int340x_thermal/int3400_thermal.c   | 48 +++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/Documentation/driver-api/thermal/intel_dptf.rst b/Documentation/driver-api/thermal/intel_dptf.rst
index 372bdb4d04c6..9a7b651ba764 100644
--- a/Documentation/driver-api/thermal/intel_dptf.rst
+++ b/Documentation/driver-api/thermal/intel_dptf.rst
@@ -84,6 +84,10 @@ DPTF ACPI Drivers interface
 	https:/github.com/intel/thermal_daemon for decoding
 	thermal table.
 
+``production_mode`` (RO)
+	When non zero, manufacturer locked thermal configuration from
+	further changes.
+
 
 ACPI Thermal Relationship table interface
 ------------------------------------------
diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
index db8a6f63657d..ec5ec07ccf41 100644
--- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
+++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
@@ -60,6 +60,8 @@ struct int3400_thermal_priv {
 	int odvp_count;
 	int *odvp;
 	u32 os_uuid_mask;
+	int production_mode;
+	bool production_mode_support;
 	struct odvp_attr *odvp_attrs;
 };
 
@@ -315,6 +317,43 @@ static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
 	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 sprintf(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;
+
+	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_support = true;
+	priv->production_mode = mode;
+
+	return 0;
+}
+
+void production_mode_exit(struct int3400_thermal_priv *priv)
+{
+	if (priv->production_mode_support)
+		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)
 {
@@ -610,8 +649,15 @@ 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)) {
@@ -638,6 +684,8 @@ 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);
-- 
2.31.1