Input: add to kernel-api docbook

Add input subsystem to kernel-api docbook.
Enhance some function and parameter comments.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/Documentation/DocBook/kernel-api.tmpl b/Documentation/DocBook/kernel-api.tmpl
index a166675..a1af278 100644
--- a/Documentation/DocBook/kernel-api.tmpl
+++ b/Documentation/DocBook/kernel-api.tmpl
@@ -533,4 +533,12 @@
 -->
      </sect1>
   </chapter>
+
+  <chapter id="input_subsystem">
+     <title>Input Subsystem</title>
+!Iinclude/linux/input.h
+!Edrivers/input/input.c
+!Edrivers/input/ff-core.c
+!Edrivers/input/ff-memless.c
+  </chapter>
 </book>