Re: [PATCH V2 1/3] thermal/int340x_thermal: Export GDDV

[Pandruvada, Srinivas]

On Mon, 2020-04-13 at 19:09 -0700, Matthew Garrett wrote:
> From: Matthew Garrett <mjg59@xxxxxxxxxx>
> 
> 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.
> 
> Signed-off-by: Matthew Garrett <mjg59@xxxxxxxxxx>
Tested-by: Pandruvada, Srinivas <srinivas.pandruvada@xxxxxxxxxxxxxxx>

> ---
>  .../intel/int340x_thermal/int3400_thermal.c   | 60
> +++++++++++++++++++
>  1 file changed, 60 insertions(+)
> 
> diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
> index ceef89c956bd4..00a7732724cd0 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,
> @@ -278,6 +297,32 @@ 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);
> @@ -309,6 +354,8 @@ static int int3400_thermal_probe(struct
> platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, priv);
>  
> +	int3400_setup_gddv(priv);
> +
>  	int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
>  	int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
>  
> @@ -327,6 +374,13 @@ 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);
> @@ -336,6 +390,9 @@ 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)
> @@ -360,8 +417,11 @@ 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);