Introduce new macro to input.h for packing matrix keypad keycodes.
As suggested by David Brownell, add two driver-internal defines:
* MATRIX_ROWCOL_MASK to strip R/C from MATRIX_KEY()
* MATRIX_KEYCODE_MASK to stip the keycode from a MATRIX_KEY()
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: David Brownell <david-b@xxxxxxxxxxx>
---
diff --git a/include/linux/input.h b/include/linux/input.h
index 1249a0c..6d88780 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -598,6 +598,17 @@ struct input_absinfo {
#define KEY_CNT (KEY_MAX+1)
/*
+ * Macro to pack the row/col of a key on a matrix keypad and it's
associated
+ * KEY_* code into into an array. 4 bits are used for both the row and
column
+ * allowing for up to a 16x16 keypad. The row (_r) and column (_c) are
+ * interchangable depending on a keypad drivers usage.
+ */
+#define MATRIX_KEY(_r, _c, _v) (((_r) << 28) | ((_c) << 24) | (_v))
+
+#define MATRIX_ROWCOL_MASK 0xff000000
+#define MATRIX_KEYCODE_MASK 0x00ffffff
+
+/*
* Relative axes
*/
--
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