[media] cec: integrate CEC notifier support

Support the CEC notifier framework, simplifying drivers that
depend on this.

Signed-off-by: Hans Verkuil <[e-mail]>
Tested-by: Marek Szyprowski <[e-mail]>
Tested-by: Benjamin Gaignard <[e-mail]>
Acked-by: Daniel Vetter <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/cec/cec-core.c

···
 	put_device(&devnode->dev);
 }
 
+#ifdef CONFIG_MEDIA_CEC_NOTIFIER
+static void cec_cec_notify(struct cec_adapter *adap, u16 pa)
+{
+	cec_s_phys_addr(adap, pa, false);
+}
+
+void cec_register_cec_notifier(struct cec_adapter *adap,
+			       struct cec_notifier *notifier)
+{
+	if (WARN_ON(!adap->devnode.registered))
+		return;
+
+	adap->notifier = notifier;
+	cec_notifier_register(adap->notifier, adap, cec_cec_notify);
+}
+EXPORT_SYMBOL_GPL(cec_register_cec_notifier);
+#endif
+
 struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
 					 void *priv, const char *name, u32 caps,
 					 u8 available_las)
···
 	adap->rc = NULL;
 #endif
 	debugfs_remove_recursive(adap->cec_dir);
+#ifdef CONFIG_MEDIA_CEC_NOTIFIER
+	if (adap->notifier)
+		cec_notifier_unregister(adap->notifier);
+#endif
 	cec_devnode_unregister(&adap->devnode);
 }
 EXPORT_SYMBOL_GPL(cec_unregister_adapter);

include/media/cec.h

···
 #include <linux/cec-funcs.h>
 #include <media/rc-core.h>
 #include <media/cec-edid.h>
+#include <media/cec-notifier.h>
 
 /**
  * struct cec_devnode - cec device node
···
 	bool passthrough;
 	struct cec_log_addrs log_addrs;
 
+#ifdef CONFIG_MEDIA_CEC_NOTIFIER
+	struct cec_notifier *notifier;
+#endif
+
 	struct dentry *cec_dir;
 	struct dentry *status_file;
 
···
 void cec_transmit_done(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt,
 		       u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt);
 void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg);
+
+#ifdef CONFIG_MEDIA_CEC_NOTIFIER
+void cec_register_cec_notifier(struct cec_adapter *adap,
+			       struct cec_notifier *notifier);
+#endif
 
 #else