[PATCH v2 09/12] gpio: acpi: Split out acpi_gpio_get_irq_resource() helper

[Andy Shevchenko]

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.shevche...@linux.intel.com>
---
 drivers/gpio/gpiolib-acpi.c | 23 ++++++++++++++++++-----
 include/linux/acpi.h        |  7 +++++++
 2 files changed, 25 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);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 137e4a3d89c5..d5aa3c42f64d 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -964,6 +964,8 @@ int devm_acpi_dev_add_driver_gpios(struct device *dev,
                                   const struct acpi_gpio_mapping *gpios);
 void devm_acpi_dev_remove_driver_gpios(struct device *dev);
 
+bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
+                               struct acpi_resource_gpio **agpio);
 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index);
 #else
 static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
@@ -980,6 +982,11 @@ static inline int devm_acpi_dev_add_driver_gpios(struct 
device *dev,
 }
 static inline void devm_acpi_dev_remove_driver_gpios(struct device *dev) {}
 
+static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
+                                             struct acpi_resource_gpio **agpio)
+{
+       return false;
+}
 static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 {
        return -ENXIO;
-- 
2.11.0