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>

3 files changed, 41 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig
index 8b841e693902..8a007cc26ac5 100644
--- a/arch/arm/mach-exynos4/Kconfig
+++ b/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
diff --git a/arch/arm/mach-exynos4/Makefile b/arch/arm/mach-exynos4/Makefile
index 486d8b4b38d3..b8f0e7d82d7e 100644
--- a/arch/arm/mach-exynos4/Makefile
+++ b/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
diff --git a/arch/arm/mach-exynos4/setup-keypad.c b/arch/arm/mach-exynos4/setup-keypad.c
new file mode 100644
index 000000000000..1ee0ebff111f
--- /dev/null
+++ b/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));
+}