Commit 5c36cf27 authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Rafael J. Wysocki
Browse files

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: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent fee19c69

Documentation/driver-api/thermal/intel_dptf.rst

+3 −0
Original line number Diff line number Diff line
@@ -84,6 +84,9 @@ DPTF ACPI Drivers interface 
	https:/github.com/intel/thermal_daemon for decoding

	thermal table.



``production_mode`` (RO)

	When different from zero, manufacturer locked thermal configuration

	from further changes.



ACPI Thermal Relationship table interface

------------------------------------------

drivers/thermal/intel/int340x_thermal/int3400_thermal.c

+48 −0
Original line number Diff line number Diff line
@@ -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 @@ 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 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);