misc/printk: Add a function to get the current hook function.

This can be necessary at run-time if a switch of one console to
another has to be made, with the possibility to reinstall the former
hook at some point.

Change-Id: I60efc74b1c94953bdc2585b99cc4816c46715372
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/misc/printk.c b/misc/printk.c
index ff66f88ae..0d671e2c2 100644
--- a/misc/printk.c
+++ b/misc/printk.c
@@ -57,6 +57,19 @@ void __printk_hook_install(int (*fn)(int))
 }
 
 /**
+ * @brief Get the current character output routine for printk
+ *
+ * To be called by any console driver that would like to save
+ * current hook - if any - for later re-installation.
+ *
+ * @return a function pointer or NULL if no hook is set
+ */
+void *__printk_get_hook(void)
+{
+	return _char_out;
+}
+
+/**
  * @brief Printk internals
  *
  * See printk() for description.