gpio: acpi: Split out acpi_gpio_get_irq_resource() helper

The helper does retrieve pointer to struct acpi_resource_gpio from
struct acpi_resource if it represents GpioInt() resource.

It will be used by PNP code later on.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 18 insertions, 5 deletions

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index e431222edc2b..6bea176b066c 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -165,6 +165,23 @@ static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
         /* The address of this function is used as a key. */
 }
 
+bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
+                                struct acpi_resource_gpio **agpio)
+{
+        struct acpi_resource_gpio *gpio;
+
+        if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+                return false;
+
+        gpio = &ares->data.gpio;
+        if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
+                return false;
+
+        *agpio = gpio;
+        return true;
+}
+EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
+
 static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
                                                    void *context)
 {
@@ -178,11 +195,7 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
         unsigned long irqflags;
         int ret, pin, irq;
 
-        if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
-                return AE_OK;
-
-        agpio = &ares->data.gpio;
-        if (agpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
+        if (!acpi_gpio_get_irq_resource(ares, &agpio))
                 return AE_OK;
 
         handle = ACPI_HANDLE(chip->parent);