1 files changed, 65 insertions, 0 deletions
diff --git a/drivers/gpu/drm/display/drm_hdmi_cec_notifier_helper.c b/drivers/gpu/drm/display/drm_hdmi_cec_notifier_helper.c
new file mode 100644
index 000000000000..31b8e4a93e24
--- /dev/null
+++ b/drivers/gpu/drm/display/drm_hdmi_cec_notifier_helper.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright (c) 2024 Linaro Ltd
+ */
+
+#include <drm/drm_bridge.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_managed.h>
+#include <drm/display/drm_hdmi_cec_helper.h>
+
+#include <linux/export.h>
+#include <linux/mutex.h>
+
+#include <media/cec.h>
+#include <media/cec-notifier.h>
+
+static void drm_connector_hdmi_cec_notifier_phys_addr_invalidate(struct drm_connector *connector)
+{
+	cec_notifier_phys_addr_invalidate(connector->cec.data);
+}
+
+static void drm_connector_hdmi_cec_notifier_phys_addr_set(struct drm_connector *connector,
+							  u16 addr)
+{
+	cec_notifier_set_phys_addr(connector->cec.data, addr);
+}
+
+static void drm_connector_hdmi_cec_notifier_unregister(struct drm_device *dev, void *res)
+{
+	struct drm_connector *connector = res;
+
+	cec_notifier_conn_unregister(connector->cec.data);
+	connector->cec.data = NULL;
+}
+
+static const struct drm_connector_cec_funcs drm_connector_cec_notifier_funcs = {
+	.phys_addr_invalidate = drm_connector_hdmi_cec_notifier_phys_addr_invalidate,
+	.phys_addr_set = drm_connector_hdmi_cec_notifier_phys_addr_set,
+};
+
+int drmm_connector_hdmi_cec_notifier_register(struct drm_connector *connector,
+					      const char *port_name,
+					      struct device *dev)
+{
+	struct cec_connector_info conn_info;
+	struct cec_notifier *notifier;
+
+	cec_fill_conn_info_from_drm(&conn_info, connector);
+
+	notifier = cec_notifier_conn_register(dev, port_name, &conn_info);
+	if (!notifier)
+		return -ENOMEM;
+
+	mutex_lock(&connector->cec.mutex);
+
+	connector->cec.data = notifier;
+	connector->cec.funcs = &drm_connector_cec_notifier_funcs;
+
+	mutex_unlock(&connector->cec.mutex);
+
+	return drmm_add_action_or_reset(connector->dev,
+					drm_connector_hdmi_cec_notifier_unregister,
+					connector);
+}
+EXPORT_SYMBOL(drmm_connector_hdmi_cec_notifier_register);