[PATCH 2/7] ARM: S5P: Add GPIOlib gpio_to_irq for external interrupts

[Joonyoung Shim]

This patch is to support gpio_to_irq() of GPIOlib for external
interrupts. The gpio_to_irq() calls s5p_gpiolib_eint_to_irq function.

Signed-off-by: Joonyoung Shim <jy0922.shim at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
 arch/arm/plat-s5p/Makefile                     |    1 +
 arch/arm/plat-s5p/gpiolib.c                    |   35 ++++++++++++++++++++++++
 arch/arm/plat-samsung/include/plat/gpio-core.h |    2 +
 3 files changed, 38 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/plat-s5p/gpiolib.c

diff --git a/arch/arm/plat-s5p/Makefile b/arch/arm/plat-s5p/Makefile
index 39c242b..f6e1a13 100644
--- a/arch/arm/plat-s5p/Makefile
+++ b/arch/arm/plat-s5p/Makefile
@@ -15,6 +15,7 @@ obj-				:=
 obj-y				+= dev-uart.o
 obj-y				+= cpu.o
 obj-y				+= clock.o
+obj-y				+= gpiolib.o
 obj-y				+= irq.o
 obj-$(CONFIG_S5P_EXT_INT)	+= irq-eint.o
 
diff --git a/arch/arm/plat-s5p/gpiolib.c b/arch/arm/plat-s5p/gpiolib.c
new file mode 100644
index 0000000..0c27a9d
--- /dev/null
+++ b/arch/arm/plat-s5p/gpiolib.c
@@ -0,0 +1,35 @@
+/*
+ * linux/arch/arm/plat-s5p/gpiolib.c
+ *
+ * Copyright (C) 2010 Samsung Electronics Co.Ltd
+ * Author: Joonyoung Shim <jy0922.shim at samsung.com>
+ *
+ * S5P - GPIOlib support
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/gpio.h>
+#include <mach/irqs.h>
+#include <mach/regs-gpio.h>
+
+/* be called from gpio_to_irq() for external interrupts */
+int s5p_gpiolib_eint_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+	switch (chip->base) {
+	case EINT_GPIO_0(0):
+		return IRQ_EINT(offset);
+	case EINT_GPIO_1(0):
+		return IRQ_EINT(8 + offset);
+	case EINT_GPIO_2(0):
+		return IRQ_EINT(16 + offset);
+	case EINT_GPIO_3(0):
+		return IRQ_EINT(24 + offset);
+	default:
+		return -EINVAL;
+	}
+}
diff --git a/arch/arm/plat-samsung/include/plat/gpio-core.h b/arch/arm/plat-samsung/include/plat/gpio-core.h
index e358c7d..f6c5151 100644
--- a/arch/arm/plat-samsung/include/plat/gpio-core.h
+++ b/arch/arm/plat-samsung/include/plat/gpio-core.h
@@ -121,6 +121,8 @@ extern void samsung_gpiolib_add_4bit2(struct s3c_gpio_chip *chip);
 /* exported for core SoC support to change */
 extern struct s3c_gpio_cfg s3c24xx_gpiocfg_default;
 
+extern int s5p_gpiolib_eint_to_irq(struct gpio_chip *chip, unsigned int offset);
+
 #ifdef CONFIG_S3C_GPIO_TRACK
 extern struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END];
 
-- 
1.7.0.4