[PATCH RFC/RFT v2 1/8] drm/connector: add CEC-related fields

[Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>]

As a preparation to adding HDMI CEC helper code, add CEC-related fields
to the struct drm_connector. Include both cec_adapter and cec_notifier,
allowing drivers to select which one to use. The unregister callback
is provided to let drivers unregister CEC-related data in a generic way
without polluting drm_connector.c with dependencies on the CEC
functions.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
 drivers/gpu/drm/drm_connector.c | 13 ++++++++++++
 include/drm/drm_connector.h     | 44 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 1383fa9fff9bcf31488453e209a36c6fe97be2f1..fffb718b09eaaac200e6abc7524bbfe98c4741f4 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -279,6 +279,7 @@ static int drm_connector_init_only(struct drm_device *dev,
 	INIT_LIST_HEAD(&connector->probed_modes);
 	INIT_LIST_HEAD(&connector->modes);
 	mutex_init(&connector->mutex);
+	mutex_init(&connector->cec.mutex);
 	mutex_init(&connector->eld_mutex);
 	mutex_init(&connector->edid_override_mutex);
 	mutex_init(&connector->hdmi.infoframes.lock);
@@ -698,6 +699,16 @@ static void drm_mode_remove(struct drm_connector *connector,
 	drm_mode_destroy(connector->dev, mode);
 }
 
+static void drm_connector_cec_unregister(struct drm_connector *connector)
+{
+	mutex_lock(&connector->cec.mutex);
+
+	if (connector->cec.funcs->unregister)
+		connector->cec.funcs->unregister(connector);
+
+	mutex_unlock(&connector->cec.mutex);
+}
+
 /**
  * drm_connector_cleanup - cleans up an initialised connector
  * @connector: connector to cleanup
@@ -718,6 +729,8 @@ void drm_connector_cleanup(struct drm_connector *connector)
 
 	platform_device_unregister(connector->hdmi_audio.codec_pdev);
 
+	drm_connector_cec_unregister(connector);
+
 	if (connector->privacy_screen) {
 		drm_privacy_screen_put(connector->privacy_screen);
 		connector->privacy_screen = NULL;
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index f13d597370a30dc1b14c630ee00145256052ba56..6da840673b1209c84bbc396643c6033679a7ec74 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -46,6 +46,7 @@ struct drm_property_blob;
 struct drm_printer;
 struct drm_privacy_screen;
 struct drm_edid;
+struct cec_adapter;
 struct edid;
 struct hdmi_codec_daifmt;
 struct hdmi_codec_params;
@@ -1191,6 +1192,19 @@ struct drm_connector_hdmi_audio_funcs {
 			   bool enable, int direction);
 };
 
+/**
+ * struct drm_connector_cec_funcs - drm_hdmi_connector control functions
+ */
+struct drm_connector_cec_funcs {
+	/**
+	 * @adap_unregister: unregister CEC adapter / notifier.
+	 *
+	 * The callback to unregister CEC adapter or notifier, so that the core
+	 * DRM layer doesn't depend on the CEC_CORE.
+	 */
+	void (*unregister)(struct drm_connector *connector);
+};
+
 /**
  * struct drm_connector_hdmi_funcs - drm_hdmi_connector control functions
  */
@@ -1832,6 +1846,31 @@ struct drm_connector_hdmi {
 	} infoframes;
 };
 
+/**
+ * struct drm_connector_cec - DRM Connector CEC-related structure
+ */
+struct drm_connector_cec {
+	/**
+	 * @mutex: protects all CEC-related fields
+	 */
+	struct mutex mutex;
+
+	/**
+	 * @adap: CEC adapter corresponding to the DRM connector.
+	 */
+	struct cec_adapter *adapter;
+
+	/**
+	 * @notifier: CEC notifier corresponding to the DRM connector.
+	 */
+	struct cec_notifier *notifier;
+
+	/**
+	 * @funcs: CEC Control Functions
+	 */
+	const struct drm_connector_cec_funcs *funcs;
+};
+
 /**
  * struct drm_connector - central DRM connector control structure
  *
@@ -2253,6 +2292,11 @@ struct drm_connector {
 	 * @hdmi_audio: HDMI codec properties and non-DRM state.
 	 */
 	struct drm_connector_hdmi_audio hdmi_audio;
+
+	/**
+	 * @cec: CEC-related data.
+	 */
+	struct drm_connector_cec cec;
 };
 
 #define obj_to_connector(x) container_of(x, struct drm_connector, base)

-- 
2.39.5