Input: add matrix keypad driver for Cirrus EP93xx

This is a keyboard driver for the Cirrus Logic EP93xx keypad matrix
peripheral. This driver is based on the pxa27x_keypad driver.

[dtor@mail.ru: Plug in input_dev->keycode so keymap can be changed
		from userspace.]
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 42 insertions, 0 deletions

diff --git a/arch/arm/mach-ep93xx/include/mach/ep93xx_keypad.h b/arch/arm/mach-ep93xx/include/mach/ep93xx_keypad.h
new file mode 100644
index 000000000000..83f31cd0a274
--- /dev/null
+++ b/arch/arm/mach-ep93xx/include/mach/ep93xx_keypad.h
@@ -0,0 +1,42 @@
+/*
+ * arch/arm/mach-ep93xx/include/mach/ep93xx_keypad.h
+ */
+
+#ifndef __ASM_ARCH_EP93XX_KEYPAD_H
+#define __ASM_ARCH_EP93XX_KEYPAD_H
+
+#define MAX_MATRIX_KEY_ROWS             (8)
+#define MAX_MATRIX_KEY_COLS             (8)
+
+/* flags for the ep93xx_keypad driver */
+#define EP93XX_KEYPAD_DISABLE_3_KEY     (1<<0)  /* disable 3-key reset */
+#define EP93XX_KEYPAD_DIAG_MODE         (1<<1)  /* diagnostic mode */
+#define EP93XX_KEYPAD_BACK_DRIVE        (1<<2)  /* back driving mode */
+#define EP93XX_KEYPAD_TEST_MODE         (1<<3)  /* scan only column 0 */
+#define EP93XX_KEYPAD_KDIV              (1<<4)  /* 1/4 clock or 1/16 clock */
+#define EP93XX_KEYPAD_AUTOREPEAT        (1<<5)  /* enable key autorepeat */
+
+/**
+ * struct ep93xx_keypad_platform_data - platform specific device structure
+ * @matrix_key_rows:            number of rows in the keypad matrix
+ * @matrix_key_cols:            number of columns in the keypad matrix
+ * @matrix_key_map:             array of keycodes defining the keypad matrix
+ * @matrix_key_map_size:        ARRAY_SIZE(matrix_key_map)
+ * @debounce:                   debounce start count; terminal count is 0xff
+ * @prescale:                   row/column counter pre-scaler load value
+ * @flags:                      see above
+ */
+struct ep93xx_keypad_platform_data {
+        unsigned int    matrix_key_rows;
+        unsigned int    matrix_key_cols;
+        unsigned int    *matrix_key_map;
+        int             matrix_key_map_size;
+        unsigned int    debounce;
+        unsigned int    prescale;
+        unsigned int    flags;
+};
+
+/* macro for creating the matrix_key_map table */
+#define KEY(row, col, val)      (((row) << 28) | ((col) << 24) | (val))
+
+#endif  /* __ASM_ARCH_EP93XX_KEYPAD_H */