Input: twl40300-keypad - fix handling of "all ground" rows

The Nokia RX51 board code (arch/arm/mach-omap2/board-rx51-peripherals.c)
defines a key map for the matrix keypad keyboard. The hardware seems to
use all of the 8 rows and 8 columns of the keypad, although not all
possible locations are used.

The TWL4030 supports keypads with at most 8 rows and 8 columns. Most keys
are defined with a row and column number between 0 and 7, except

        KEY(0xff, 2, KEY_F9),
        KEY(0xff, 4, KEY_F10),
        KEY(0xff, 5, KEY_F11),

which represent keycodes that should be emitted when entire row is
connected to the ground.  since the driver handles this case as if we
had an extra column in the key matrix. Unfortunately we do not allocate
enough space and end up owerwriting some random memory.

Reported-and-tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/input/keyboard/twl4030_keypad.c b/drivers/input/keyboard/twl4030_keypad.c
index 7aa59e07b68..fb16b5e5ea1 100644
--- a/drivers/input/keyboard/twl4030_keypad.c
+++ b/drivers/input/keyboard/twl4030_keypad.c
@@ -51,8 +51,12 @@
  */
 #define TWL4030_MAX_ROWS        8       /* TWL4030 hard limit */
 #define TWL4030_MAX_COLS        8
-#define TWL4030_ROW_SHIFT       3
-#define TWL4030_KEYMAP_SIZE     (TWL4030_MAX_ROWS * TWL4030_MAX_COLS)
+/*
+ * Note that we add space for an extra column so that we can handle
+ * row lines connected to the gnd (see twl4030_col_xlate()).
+ */
+#define TWL4030_ROW_SHIFT       4
+#define TWL4030_KEYMAP_SIZE     (TWL4030_MAX_ROWS << TWL4030_ROW_SHIFT)
 
 struct twl4030_keypad {
         unsigned short  keymap[TWL4030_KEYMAP_SIZE];
@@ -182,7 +186,7 @@ static int twl4030_read_kp_matrix_state(struct twl4030_keypad *kp, u16 *state)
         return ret;
 }
 
-static int twl4030_is_in_ghost_state(struct twl4030_keypad *kp, u16 *key_state)
+static bool twl4030_is_in_ghost_state(struct twl4030_keypad *kp, u16 *key_state)
 {
         int i;
         u16 check = 0;
@@ -191,12 +195,12 @@ static int twl4030_is_in_ghost_state(struct twl4030_keypad *kp, u16 *key_state)
                 u16 col = key_state[i];
 
                 if ((col & check) && hweight16(col) > 1)
-                        return 1;
+                        return true;
 
                 check |= col;
         }
 
-        return 0;
+        return false;
 }
 
 static void twl4030_kp_scan(struct twl4030_keypad *kp, bool release_all)
@@ -225,7 +229,8 @@ static void twl4030_kp_scan(struct twl4030_keypad *kp, bool release_all)
                 if (!changed)
                         continue;
 
-                for (col = 0; col < kp->n_cols; col++) {
+                /* Extra column handles "all gnd" rows */
+                for (col = 0; col < kp->n_cols + 1; col++) {
                         int code;
 
                         if (!(changed & (1 << col)))