• Mauro Carvalho Chehab's avatar
    Input: add support for large scancodes · 8613e4c2
    Mauro Carvalho Chehab authored
    Several devices use a high number of bits for scancodes. One important
    group is the Remote Controllers. Some new protocols like RC-6 define a
    scancode space of 64 bits.
    
    The current EVIO[CS]GKEYCODE ioctls allow replace the scancode/keycode
    translation tables, but it is limited to up to 32 bits for scancode.
    
    Also, if userspace wants to clean the existing table, replacing it by
    a new one, it needs to run a loop calling the ioctls over the entire
    sparse scancode space.
    
    To solve those problems, this patch extends the ioctls to allow drivers
    handle scancodes up to 32 bytes long (the length could be extended in
    the future should such need arise) and allow userspace to query and set
    scancode to keycode mappings not only by scancode but also by index.
    
    Compatibility code were also added to handle the old format of
    EVIO[CS]GKEYCODE ioctls.
    
    Folded fixes by:
    - Dan Carpenter: locking fixes for the original implementation
    - Jarod Wilson: fix crash when setting keycode and wiring up get/set
                    handlers in original implementation.
    - Dmitry Torokhov: rework to consolidate old and new scancode handling,
                       provide options to act either by index or scancode.
    Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
    Signed-off-by: default avatarDan Carpenter <error27@gmail.com>
    Signed-off-by: default avatarJarod Wilson <jarod@redhat.com>
    Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
    8613e4c2
keyboard.c 32.9 KB