Merge tag 'v4.1-rc3' into devel

[karo-tx-linux.git] / drivers / gpio / gpiolib-acpi.c

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 725d16138b740e27a39d151ec5f7bfdedb9a969b..19b99d0c2bf008bf0ab9a730873463999a7b5008 100644 (file)
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -514,6 +514,35 @@ struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
        return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
 }
 
+/**
+ * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
+ * @adev: pointer to a ACPI device to get IRQ from
+ * @index: index of GpioInt resource (starting from %0)
+ *
+ * If the device has one or more GpioInt resources, this function can be
+ * used to translate from the GPIO offset in the resource to the Linux IRQ
+ * number.
+ *
+ * Return: Linux IRQ number (>%0) on success, negative errno on failure.
+ */
+int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
+{
+       int idx, i;
+
+       for (i = 0, idx = 0; idx <= index; i++) {
+               struct acpi_gpio_info info;
+               struct gpio_desc *desc;
+
+               desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
+               if (IS_ERR(desc))
+                       break;
+               if (info.gpioint && idx++ == index)
+                       return gpiod_to_irq(desc);
+       }
+       return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
+
 static acpi_status
 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
                            u32 bits, u64 *value, void *handler_context,