[PATCH 3/5] ARM: S5PC110: gpio_to_irq support on external interrupt

[Kyungmin Park]

From: Kyungmin Park <kyungmin.park at samsung.com>

Using group field, it can calculate the related irq number easily.
Also if don't support gpio_to_irq, it can't use the gpio functionaliy fully.
e.g., can't use the gpio-keys and so on

Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
 arch/arm/mach-s5pv210/gpiolib.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-s5pv210/gpiolib.c b/arch/arm/mach-s5pv210/gpiolib.c
index f6a32c4..bd24c81 100644
--- a/arch/arm/mach-s5pv210/gpiolib.c
+++ b/arch/arm/mach-s5pv210/gpiolib.c
@@ -246,6 +246,15 @@ static struct s3c_gpio_chip s5pv210_gpio_4bit[] = {
 	},
 };
 
+static int s5pv210_extint_to_irq(struct gpio_chip *gpio, unsigned int offset)
+{
+	struct s3c_gpio_chip *chip = to_s3c_gpio(gpio);
+	int irq;
+
+	irq = (chip->group * 8) + offset;
+	return IRQ_EINT(irq);
+}
+
 static __init int s5pv210_gpiolib_init(void)
 {
 	struct s3c_gpio_chip *chip = s5pv210_gpio_4bit;
@@ -257,6 +266,9 @@ static __init int s5pv210_gpiolib_init(void)
 			chip->config = &gpio_cfg;
 		if (chip->config == &gpio_cfg_extint) {
 			chip->base = S5PV210_BANK_BASE(extint) + EXTINT_OFFSET;
+			/* Assign the external GPIO interrupt group number */
+			chip->group = extint;
+			chip->chip.to_irq = s5pv210_extint_to_irq;
 			extint++;
 		}
 		if (chip->base == NULL)
-- 
1.5.3.3