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authorMatthew Garrett <mjg59@google.com>2020-04-13 19:09:51 -0700
committerDaniel Lezcano <daniel.lezcano@linaro.org>2020-05-29 20:26:51 +0200
commit0ba13c763aacb27ab32bde5d559bf40e88465921 (patch)
tree74bc43e2480c0cc51393774ccbc6cdd1a33a960a
parent47fa116e5faec894f6238f87322c01dd41d21e23 (diff)
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
-rw-r--r--drivers/thermal/intel/int340x_thermal/int3400_thermal.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
index e802922a13cf..0ad0469e91ba 100644
--- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
+++ b/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);