i2c: acpi: Use available IRQ helper functions

Use the available IRQ helper functions, most of the functions have
additional helpful side affects like configuring the trigger type of the
IRQ.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 13 insertions, 9 deletions

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 964687534754..d3474d1f5e09 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -137,13 +137,23 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev,
         return 0;
 }
 
+static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
+{
+        int *irq = data;
+        struct resource r;
+
+        if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
+                *irq = i2c_dev_irq_from_resources(&r, 1);
+
+        return 1; /* No need to add resource to the list */
+}
+
 static int i2c_acpi_get_info(struct acpi_device *adev,
                              struct i2c_board_info *info,
                              struct i2c_adapter *adapter,
                              acpi_handle *adapter_handle)
 {
         struct list_head resource_list;
-        struct resource_entry *entry;
         struct i2c_acpi_lookup lookup;
         int ret;
 
@@ -176,17 +186,11 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
 
         /* Then fill IRQ number if any */
         INIT_LIST_HEAD(&resource_list);
-        ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
+        ret = acpi_dev_get_resources(adev, &resource_list,
+                                     i2c_acpi_add_resource, &info->irq);
         if (ret < 0)
                 return -EINVAL;
 
-        resource_list_for_each_entry(entry, &resource_list) {
-                if (resource_type(entry->res) == IORESOURCE_IRQ) {
-                        info->irq = entry->res->start;
-                        break;
-                }
-        }
-
         acpi_dev_free_resource_list(&resource_list);
 
         acpi_set_modalias(adev, dev_name(&adev->dev), info->type,