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>

1 files changed, 35 insertions, 0 deletions

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));
+}