[PATCH 1/4] add to_irq function so we can map gpios to external interrupts.

[sfking]

From: Steven King <sfk...@fdwdc.com>

---
 arch/m68k/platform/coldfire/gpio.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/m68k/platform/coldfire/gpio.c 
b/arch/m68k/platform/coldfire/gpio.c
index 9cd2b5c..ab9ac41 100644
--- a/arch/m68k/platform/coldfire/gpio.c
+++ b/arch/m68k/platform/coldfire/gpio.c
@@ -147,6 +147,18 @@ void mcfgpio_free(struct gpio_chip *chip, unsigned offset)
        __mcfgpio_free(offset);
 }
 
+int mcfgpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+#if defined(MCFGPIO_IRQ_MIN)
+       if ((offset >= MCFGPIO_IRQ_MIN) && (offset < MCFGPIO_IRQ_MAX))
+#else
+       if (offset < MCFGPIO_IRQ_MAX)
+#endif
+               return MCFGPIO_IRQ_VECBASE + offset;
+       else
+               return -EINVAL;
+}
+
 struct bus_type mcfgpio_subsys = {
        .name           = "gpio",
        .dev_name       = "gpio",
@@ -160,6 +172,7 @@ static struct gpio_chip mcfgpio_chip = {
        .direction_output       = mcfgpio_direction_output,
        .get                    = mcfgpio_get_value,
        .set                    = mcfgpio_set_value,
+       .to_irq                 = mcfgpio_to_irq,
        .base                   = 0,
        .ngpio                  = MCFGPIO_PIN_MAX,
 };
-- 
1.7.10.4

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