keymap: add Genius SlimStar 320

This keyboard have 16 "multimedia" keys plus a "4-way turbo scroll pad" which
is essentially a round up/down/left/right button. Unfortunately most of these
keys emit non-standard scancodes in a range 495-508 which does not make any
sense. I tried to remap those to the best of my knowledge.

Note the keyboard comes up as two event devices, second one is multimedia
keys, so I ended up adding ENV{ID_USB_INTERFACE_NUM}=="01" to avoid
unnecessary initialization of the "main" keyboard.

extras/keymap/95-keymap.rules

@@ -20,6 +20,7 @@ GOTO="keyboard_modulecheck"
 
 LABEL="keyboard_usbcheck"
 
+ENV{ID_VENDOR}=="Genius", ENV{ID_MODEL_ID}=="0708", ENV{ID_USB_INTERFACE_NUM}=="01", RUN+="keymap $name genius-slimstar-320"
 ENV{ID_VENDOR}=="Logitech*", ATTRS{name}=="Logitech USB Multimedia Keyboard", RUN+="keymap $name logitech-wave"
 ENV{ID_VENDOR}=="Logitech*", ATTRS{name}=="Logitech USB Receiver", RUN+="keymap $name logitech-wave-cordless"
 # Logitech Cordless Wave Pro looks slightly weird; some hotkeys are coming through the mouse interface

extras/keymap/keymaps/genius-slimstar-320

@@ -0,0 +1,35 @@
+# Genius SlimStar 320
+#
+# Only buttons which are not properly mapped yet are configured below
+
+# "Scroll wheel", a circular up/down/left/right button. Aimed for scolling,
+# but since there are no scrollleft/scrollright, let's map to back/forward.
+0x900f0 scrollup
+0x900f1 scrolldown
+0x900f3 back
+0x900f2 forward
+
+# Multimedia buttons, left side (from left to right)
+# [W]
+0x900f5 wordprocessor
+# [Ex]
+0x900f6 spreadsheet
+# [P]
+0x900f4 presentation
+# Other five (calculator, playpause, stop, mute and eject) are OK
+
+# Right side, from left to right
+# [e]
+0xc0223 www
+# "man"
+0x900f7 chat
+# "Y"
+0x900fb prog1
+# [X]
+0x900f8 close
+# "picture"
+0x900f9 graphicseditor
+# "two windows"
+0x900fd scale
+# "lock"
+0x900fc screenlock