media: cec: add struct cec_connector_info support

Define struct cec_connector_info in media/cec.h and define
CEC_CAP_CONNECTOR_INFO. In a later patch this will be moved to
uapi/linux/cec.h.

The CEC_CAP_CONNECTOR_INFO capability can be set by drivers, but
cec_allocate_adapter() will remove it again until the public API
for this can be enabled once all drm drivers wire this up correctly.

Also add the cec_fill_conn_info_from_drm and cec_s_conn_info functions,
which are needed by drm drivers to fill in the cec_connector info
based on a drm_connector.

The cec_notifier_(un)register and cec_register_cec_notifier
prototypes were moved from cec-notifier.h to cec.h since cec.h no longer
includes cec-notifier.h. These headers included each other before,
which caused various problems.

Due to these changes the seco-cec driver was changed as well: it
should include cec-notifier.h, not cec.h.

Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/cec/cec-adap.c

@@ -16,7 +16,10 @@
 #include <linux/string.h>
 #include <linux/types.h>
 
+#include <drm/drm_connector.h>
+#include <drm/drm_device.h>
 #include <drm/drm_edid.h>
+#include <drm/drm_file.h>
 
 #include "cec-priv.h"
 
@@ -75,6 +78,16 @@ u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
 }
 EXPORT_SYMBOL_GPL(cec_get_edid_phys_addr);
 
+void cec_fill_conn_info_from_drm(struct cec_connector_info *conn_info,
+				 const struct drm_connector *connector)
+{
+	memset(conn_info, 0, sizeof(*conn_info));
+	conn_info->type = CEC_CONNECTOR_TYPE_DRM;
+	conn_info->drm.card_no = connector->dev->primary->index;
+	conn_info->drm.connector_id = connector->base.id;
+}
+EXPORT_SYMBOL_GPL(cec_fill_conn_info_from_drm);
+
 /*
  * Queue a new event for this filehandle. If ts == 0, then set it
  * to the current time.
@@ -1598,6 +1611,22 @@ void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
 }
 EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid);
 
+void cec_s_conn_info(struct cec_adapter *adap,
+		     const struct cec_connector_info *conn_info)
+{
+	if (!(adap->capabilities & CEC_CAP_CONNECTOR_INFO))
+		return;
+
+	mutex_lock(&adap->lock);
+	if (conn_info)
+		adap->conn_info = *conn_info;
+	else
+		memset(&adap->conn_info, 0, sizeof(adap->conn_info));
+	cec_post_state_event(adap);
+	mutex_unlock(&adap->lock);
+}
+EXPORT_SYMBOL_GPL(cec_s_conn_info);
+
 /*
  * Called from either the ioctl or a driver to set the logical addresses.
  *