Input: pxa27x_keypad - introduce driver structure and use KEY() to define matrix keys

 1. Introduce the "struct pxa27x_keypad" structure for driver specific
    information, such as "struct clk", generated matrix key codes and
    so on

 2. Use KEY() macro to define matrix keys, instead of original 8x8 map
    this makes definition easier with keypad where keys are sparse

 3. Keep a generated array in "struct pxa27x_keypad" for fast lookup

 4. Separate the matrix scan into a dedicated function for readability
    and report only those keys whose state has been changed, instead
    of report all states

 5. Make use of KPAS to decide the faster path if only one key has been
    detected

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 17 insertions, 4 deletions

diff --git a/include/asm-arm/arch-pxa/pxa27x_keypad.h b/include/asm-arm/arch-pxa/pxa27x_keypad.h
index ef17db6d791e..1b1bf9fe6d81 100644
--- a/include/asm-arm/arch-pxa/pxa27x_keypad.h
+++ b/include/asm-arm/arch-pxa/pxa27x_keypad.h
@@ -1,12 +1,25 @@
-#define PXAKBD_MAXROW           8
-#define PXAKBD_MAXCOL           8
+#ifndef __ASM_ARCH_PXA27x_KEYPAD_H
+#define __ASM_ARCH_PXA27x_KEYPAD_H
+
+#include <linux/input.h>
+
+#define MAX_MATRIX_KEY_ROWS     (8)
+#define MAX_MATRIX_KEY_COLS     (8)
 
 struct pxa27x_keypad_platform_data {
-        int nr_rows, nr_cols;
-        int keycodes[PXAKBD_MAXROW][PXAKBD_MAXCOL];
+
+        /* code map for the matrix keys */
+        unsigned int    matrix_key_rows;
+        unsigned int    matrix_key_cols;
+        unsigned int    *matrix_key_map;
+        int             matrix_key_map_size;
 
 #ifdef CONFIG_PM
         u32 reg_kpc;
         u32 reg_kprec;
 #endif
 };
+
+#define KEY(row, col, val)      (((row) << 28) | ((col) << 24) | (val))
+
+#endif /* __ASM_ARCH_PXA27x_KEYPAD_H */