HID: Add Tablet Pick -> BTN_STYLUS2 mapping

Many tablet input drivers use BTN_STYLUS2 code to report a second
tablet stylus button. Yet, the generic HID input driver doesn't map it.
Apparently, because there is no corresponding usage in the HID Usage Tables.

This patch selects a compromise usage - "Tablet Pick" (0x46) to be mapped to
BTN_STYLUS2. Some tablets use "Eraser" usage, but mapping it to a button
wouldn't be entirely correct, because the specification says it may be "a
pressure quantity".

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 6c03dcc..0c2908f 100644 (file)
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -336,6 +336,10 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
                        map_key_clear(BTN_STYLUS);
                        break;
 
+               case 0x46: /* TabletPick */
+                       map_key_clear(BTN_STYLUS2);
+                       break;
+
                default:  goto unknown;
                }
                break;