ARM: EXYNOS4: Add keypad device helpers

This patch adds the samsung_keypad_cfg_gpio() for EXYNOS4.
Now, this helpers are only for keypad operating in PORT-0.

Signed-off-by: Naveen Krishna Ch <ch.naveen@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-exynos4/Kconfig

@@ -65,6 +65,11 @@ config EXYNOS4_SETUP_I2C7
 	help
 	  Common setup code for i2c bus 7.
 
+config EXYNOS4_SETUP_KEYPAD
+	bool
+	help
+	  Common setup code for keypad.
+
 config EXYNOS4_SETUP_SDHCI
 	bool
 	select EXYNOS4_SETUP_SDHCI_GPIO

arch/arm/mach-exynos4/Makefile

@@ -50,6 +50,7 @@ obj-$(CONFIG_EXYNOS4_SETUP_I2C4)	+= setup-i2c4.o
 obj-$(CONFIG_EXYNOS4_SETUP_I2C5)	+= setup-i2c5.o
 obj-$(CONFIG_EXYNOS4_SETUP_I2C6)	+= setup-i2c6.o
 obj-$(CONFIG_EXYNOS4_SETUP_I2C7)	+= setup-i2c7.o
+obj-$(CONFIG_EXYNOS4_SETUP_KEYPAD)	+= setup-keypad.o
 obj-$(CONFIG_EXYNOS4_SETUP_SDHCI)	+= setup-sdhci.o
 obj-$(CONFIG_EXYNOS4_SETUP_SDHCI_GPIO)	+= setup-sdhci-gpio.o
 obj-$(CONFIG_SATA_AHCI_PLATFORM)	+= dev-ahci.o

arch/arm/mach-exynos4/setup-keypad.c

@@ -0,0 +1,35 @@
+/* linux/arch/arm/mach-exynos4/setup-keypad.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * GPIO configuration for Exynos4 KeyPad device
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/gpio.h>
+#include <plat/gpio-cfg.h>
+
+void samsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)
+{
+	/* Keypads can be of various combinations, Just making sure */
+
+	if (rows > 8) {
+		/* Set all the necessary GPX2 pins: KP_ROW[0~7] */
+		s3c_gpio_cfgrange_nopull(EXYNOS4_GPX2(0), 8, S3C_GPIO_SFN(3));
+
+		/* Set all the necessary GPX3 pins: KP_ROW[8~] */
+		s3c_gpio_cfgrange_nopull(EXYNOS4_GPX3(0), (rows - 8),
+					 S3C_GPIO_SFN(3));
+	} else {
+		/* Set all the necessary GPX2 pins: KP_ROW[x] */
+		s3c_gpio_cfgrange_nopull(EXYNOS4_GPX2(0), rows,
+					 S3C_GPIO_SFN(3));
+	}
+
+	/* Set all the necessary GPX1 pins to special-function 3: KP_COL[x] */
+	s3c_gpio_cfgrange_nopull(EXYNOS4_GPX1(0), cols, S3C_GPIO_SFN(3));
+}