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>

arch/arm/mach-ep93xx/include/mach/ep93xx_keypad.h

+/*
+ * 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 */

drivers/input/keyboard/Kconfig

@@ -332,4 +332,14 @@ config KEYBOARD_SH_KEYSC
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called sh_keysc.
++
+config KEYBOARD_EP93XX
+	tristate "EP93xx Matrix Keypad support"
+	depends on ARCH_EP93XX
+	help
+	  Say Y here to enable the matrix keypad on the Cirrus EP93XX.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ep93xx_keypad.
+
 endif

drivers/input/keyboard/Makefile

@@ -28,3 +28,4 @@ obj-$(CONFIG_KEYBOARD_HP7XX)		+= jornada720_kbd.o
 obj-$(CONFIG_KEYBOARD_MAPLE)		+= maple_keyb.o
 obj-$(CONFIG_KEYBOARD_BFIN)		+= bf54x-keys.o
 obj-$(CONFIG_KEYBOARD_SH_KEYSC)		+= sh_keysc.o
+obj-$(CONFIG_KEYBOARD_EP93XX)		+= ep93xx_keypad.o