thermal/int340x_thermal: Export GDDV

Implementing DPTF properly requires making use of firmware-provided
information associated with the INT3400 device. Calling GDDV provides a
buffer of information which userland can then interpret to determine
appropriate DPTF policy.

Conflicts:
	drivers/thermal/intel/int340x_thermal/int3400_thermal.c

Signed-off-by: Matthew Garrett <mjg59@google.com>
Tested-by: Pandruvada, Srinivas <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Link: https://lore.kernel.org/r/20200414020953.255364-1-matthewgarrett@google.com

Author: mjg59

drivers/thermal/intel/int340x_thermal/int3400_thermal.c

@@ -52,6 +52,25 @@ struct int3400_thermal_priv {
 	u8 uuid_bitmap;
 	int rel_misc_dev_res;
 	int current_uuid_index;
+	char *data_vault;
+};
+
+static ssize_t data_vault_read(struct file *file, struct kobject *kobj,
+	     struct bin_attribute *attr, char *buf, loff_t off, size_t count)
+{
+	memcpy(buf, attr->private + off, count);
+	return count;
+}
+
+static BIN_ATTR_RO(data_vault, 0);
+
+static struct bin_attribute *data_attributes[] = {
+	&bin_attr_data_vault,
+	NULL,
+};
+
+static const struct attribute_group data_attribute_group = {
+	.bin_attrs = data_attributes,
 };
 
 static ssize_t available_uuids_show(struct device *dev,
@@ -280,6 +299,32 @@ static struct thermal_zone_params int3400_thermal_params = {
 	.no_hwmon = true,
 };
 
+static void int3400_setup_gddv(struct int3400_thermal_priv *priv)
+{
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *obj;
+	acpi_status status;
+
+	status = acpi_evaluate_object(priv->adev->handle, "GDDV", NULL,
+				      &buffer);
+	if (ACPI_FAILURE(status) || !buffer.length)
+		return;
+
+	obj = buffer.pointer;
+	if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count != 1
+	    || obj->package.elements[0].type != ACPI_TYPE_BUFFER) {
+		kfree(buffer.pointer);
+		return;
+	}
+
+	priv->data_vault = kmemdup(obj->package.elements[0].buffer.pointer,
+				   obj->package.elements[0].buffer.length,
+				   GFP_KERNEL);
+	bin_attr_data_vault.private = priv->data_vault;
+	bin_attr_data_vault.size = obj->package.elements[0].buffer.length;
+	kfree(buffer.pointer);
+}
+
 static int int3400_thermal_probe(struct platform_device *pdev)
 {
 	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
@@ -311,6 +356,8 @@ static int int3400_thermal_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, priv);
 
+	int3400_setup_gddv(priv);
+
 	priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
 						priv, &int3400_thermal_ops,
 						&int3400_thermal_params, 0, 0);
@@ -326,6 +373,13 @@ static int int3400_thermal_probe(struct platform_device *pdev)
 	if (result)
 		goto free_rel_misc;
 
+	if (priv->data_vault) {
+		result = sysfs_create_group(&pdev->dev.kobj,
+					    &data_attribute_group);
+		if (result)
+			goto free_uuid;
+	}
+
 	result = acpi_install_notify_handler(
 			priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
 			(void *)priv);
@@ -335,6 +389,9 @@ static int int3400_thermal_probe(struct platform_device *pdev)
 	return 0;
 
 free_sysfs:
+	if (priv->data_vault)
+		sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group);
+free_uuid:
 	sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 free_rel_misc:
 	if (!priv->rel_misc_dev_res)
@@ -359,8 +416,11 @@ static int int3400_thermal_remove(struct platform_device *pdev)
 	if (!priv->rel_misc_dev_res)
 		acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 
+	if (priv->data_vault)
+		sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group);
 	sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 	thermal_zone_device_unregister(priv->thermal);
+	kfree(priv->data_vault);
 	kfree(priv->trts);
 	kfree(priv->arts);
 	kfree(priv);