[PATCH 2/6] platform/x86/intel/tpmi: Add API to get debugfs root

[Tero Kristo <tero.kristo@linux.intel.com>]

Add new API to get the debugfs root directory for TPMI. This allows any
TPMI devices to add their own debugfs items under the same directory
structure.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
---
 drivers/platform/x86/intel/tpmi.c | 9 +++++++++
 include/linux/intel_tpmi.h        | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/platform/x86/intel/tpmi.c b/drivers/platform/x86/intel/tpmi.c
index c2ef2cd587ba..83e8b1fe53b3 100644
--- a/drivers/platform/x86/intel/tpmi.c
+++ b/drivers/platform/x86/intel/tpmi.c
@@ -357,6 +357,15 @@ int tpmi_get_feature_status(struct auxiliary_device *auxdev,
 }
 EXPORT_SYMBOL_NS_GPL(tpmi_get_feature_status, INTEL_TPMI);
 
+struct dentry *tpmi_get_debugfs_dir(struct auxiliary_device *auxdev)
+{
+	struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(auxdev->dev.parent);
+	struct intel_tpmi_info *tpmi_info = auxiliary_get_drvdata(&intel_vsec_dev->auxdev);
+
+	return tpmi_info->dbgfs_dir;
+}
+EXPORT_SYMBOL_NS_GPL(tpmi_get_debugfs_dir, INTEL_TPMI);
+
 static int tpmi_pfs_dbg_show(struct seq_file *s, void *unused)
 {
 	struct intel_tpmi_info *tpmi_info = s->private;
diff --git a/include/linux/intel_tpmi.h b/include/linux/intel_tpmi.h
index a88ac937d2c2..ff480b47ae64 100644
--- a/include/linux/intel_tpmi.h
+++ b/include/linux/intel_tpmi.h
@@ -54,4 +54,5 @@ struct resource *tpmi_get_resource_at_index(struct auxiliary_device *auxdev, int
 int tpmi_get_resource_count(struct auxiliary_device *auxdev);
 int tpmi_get_feature_status(struct auxiliary_device *auxdev, int feature_id, bool *read_blocked,
 			    bool *write_blocked);
+struct dentry *tpmi_get_debugfs_dir(struct auxiliary_device *auxdev);
 #endif
-- 
2.43.1