Input: i8042 - allow installing platform filters for incoming data

Some hardware (such as Dell laptops) signal a variety of events through
the i8042 controller, even if these don't map to keyboard events. Add
support for drivers to filter the i8042 event stream in order to respond
to these events and (if appropriate) block them from entering the input
stream.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 17 insertions, 1 deletions

diff --git a/include/linux/i8042.h b/include/linux/i8042.h
index 60c3360ef6ad..9bf6870ee5f4 100644
--- a/include/linux/i8042.h
+++ b/include/linux/i8042.h
@@ -39,6 +39,10 @@ void i8042_lock_chip(void);
 void i8042_unlock_chip(void);
 int i8042_command(unsigned char *param, int command);
 bool i8042_check_port_owner(const struct serio *);
+int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
+                                        struct serio *serio));
+int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
+                                       struct serio *serio));
 
 #else
 
@@ -52,7 +56,7 @@ void i8042_unlock_chip(void)
 
 int i8042_command(unsigned char *param, int command)
 {
-        return -ENOSYS;
+        return -ENODEV;
 }
 
 bool i8042_check_port_owner(const struct serio *serio)
@@ -60,6 +64,18 @@ bool i8042_check_port_owner(const struct serio *serio)
         return false;
 }
 
+int i8042_install_filter(bool (*filter)(unsigned char data, unsigned char str,
+                                        struct serio *serio))
+{
+        return -ENODEV;
+}
+
+int i8042_remove_filter(bool (*filter)(unsigned char data, unsigned char str,
+                                       struct serio *serio))
+{
+        return -ENODEV;
+}
+
 #endif
 
 #endif