media: cec-notifier: add new notifier functions

In order to support multiple CEC devices for an HDMI connector,
and to support cec_connector_info, drivers should use either a
cec_notifier_conn_(un)register pair of functions (HDMI drivers)
or a cec_notifier_cec_adap_(un)register pair (CEC adapter drivers).

This replaces cec_notifier_get_conn/cec_notifier_put.

For CEC adapters it is also no longer needed to call cec_notifier_register,
cec_register_cec_notifier and cec_notifier_unregister. This is now
all handled internally by the new functions.

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

1 files changed, 85 insertions, 0 deletions

diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
index f72b19c351dd..52a867bde15f 100644
--- a/drivers/media/cec/cec-notifier.c
+++ b/drivers/media/cec/cec-notifier.c
@@ -22,6 +22,7 @@ struct cec_notifier {
 	struct list_head head;
 	struct kref kref;
 	struct device *hdmi_dev;
+	struct cec_connector_info conn_info;
 	const char *conn_name;
 	struct cec_adapter *cec_adap;
 	void (*callback)(struct cec_adapter *adap, u16 pa);
@@ -88,6 +89,84 @@ void cec_notifier_put(struct cec_notifier *n)
 }
 EXPORT_SYMBOL_GPL(cec_notifier_put);
 
+struct cec_notifier *
+cec_notifier_conn_register(struct device *hdmi_dev, const char *conn_name,
+			   const struct cec_connector_info *conn_info)
+{
+	struct cec_notifier *n = cec_notifier_get_conn(hdmi_dev, conn_name);
+
+	if (!n)
+		return n;
+
+	mutex_lock(&n->lock);
+	n->phys_addr = CEC_PHYS_ADDR_INVALID;
+	if (conn_info)
+		n->conn_info = *conn_info;
+	else
+		memset(&n->conn_info, 0, sizeof(n->conn_info));
+	if (n->cec_adap) {
+		cec_phys_addr_invalidate(n->cec_adap);
+		cec_s_conn_info(n->cec_adap, conn_info);
+	}
+	mutex_unlock(&n->lock);
+	return n;
+}
+EXPORT_SYMBOL_GPL(cec_notifier_conn_register);
+
+void cec_notifier_conn_unregister(struct cec_notifier *n)
+{
+	if (!n)
+		return;
+
+	mutex_lock(&n->lock);
+	memset(&n->conn_info, 0, sizeof(n->conn_info));
+	n->phys_addr = CEC_PHYS_ADDR_INVALID;
+	if (n->cec_adap) {
+		cec_phys_addr_invalidate(n->cec_adap);
+		cec_s_conn_info(n->cec_adap, NULL);
+	}
+	mutex_unlock(&n->lock);
+	cec_notifier_put(n);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_conn_unregister);
+
+struct cec_notifier *
+cec_notifier_cec_adap_register(struct device *hdmi_dev, const char *conn_name,
+			       struct cec_adapter *adap)
+{
+	struct cec_notifier *n;
+
+	if (WARN_ON(!adap))
+		return NULL;
+
+	n = cec_notifier_get_conn(hdmi_dev, conn_name);
+	if (!n)
+		return n;
+
+	mutex_lock(&n->lock);
+	n->cec_adap = adap;
+	adap->conn_info = n->conn_info;
+	adap->notifier = n;
+	cec_s_phys_addr(adap, n->phys_addr, false);
+	mutex_unlock(&n->lock);
+	return n;
+}
+EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_register);
+
+void cec_notifier_cec_adap_unregister(struct cec_notifier *n)
+{
+	if (!n)
+		return;
+
+	mutex_lock(&n->lock);
+	n->cec_adap->notifier = NULL;
+	n->cec_adap = NULL;
+	n->callback = NULL;
+	mutex_unlock(&n->lock);
+	cec_notifier_put(n);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_cec_adap_unregister);
+
 void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
 {
 	if (n == NULL)
@@ -97,6 +176,8 @@ void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa)
 	n->phys_addr = pa;
 	if (n->callback)
 		n->callback(n->cec_adap, n->phys_addr);
+	else if (n->cec_adap)
+		cec_s_phys_addr(n->cec_adap, n->phys_addr, false);
 	mutex_unlock(&n->lock);
 }
 EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr);
@@ -131,6 +212,10 @@ EXPORT_SYMBOL_GPL(cec_notifier_register);
 
 void cec_notifier_unregister(struct cec_notifier *n)
 {
+	/* Do nothing unless cec_notifier_register was called first */
+	if (!n->callback)
+		return;
+
 	mutex_lock(&n->lock);
 	n->callback = NULL;
 	mutex_unlock(&n->lock);