ACPI: Introduce helper function acpi_dev_filter_resource_type()

Introduce helper function acpi_dev_filter_resource_type(), which may
be used by acpi_dev_get_resources() to filer out resource based on
resource type.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 63 insertions, 0 deletions

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 1c3abae6f2fa..3ea0d17eb951 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -569,3 +569,58 @@ int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
         return c.count;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
+
+/**
+ * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
+ *                                 types
+ * @ares: Input ACPI resource object.
+ * @types: Valid resource types of IORESOURCE_XXX
+ *
+ * This is a hepler function to support acpi_dev_get_resources(), which filters
+ * ACPI resource objects according to resource types.
+ */
+int acpi_dev_filter_resource_type(struct acpi_resource *ares,
+                                  unsigned long types)
+{
+        unsigned long type = 0;
+
+        switch (ares->type) {
+        case ACPI_RESOURCE_TYPE_MEMORY24:
+        case ACPI_RESOURCE_TYPE_MEMORY32:
+        case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+                type = IORESOURCE_MEM;
+                break;
+        case ACPI_RESOURCE_TYPE_IO:
+        case ACPI_RESOURCE_TYPE_FIXED_IO:
+                type = IORESOURCE_IO;
+                break;
+        case ACPI_RESOURCE_TYPE_IRQ:
+        case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
+                type = IORESOURCE_IRQ;
+                break;
+        case ACPI_RESOURCE_TYPE_DMA:
+        case ACPI_RESOURCE_TYPE_FIXED_DMA:
+                type = IORESOURCE_DMA;
+                break;
+        case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
+                type = IORESOURCE_REG;
+                break;
+        case ACPI_RESOURCE_TYPE_ADDRESS16:
+        case ACPI_RESOURCE_TYPE_ADDRESS32:
+        case ACPI_RESOURCE_TYPE_ADDRESS64:
+        case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
+                if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
+                        type = IORESOURCE_MEM;
+                else if (ares->data.address.resource_type == ACPI_IO_RANGE)
+                        type = IORESOURCE_IO;
+                else if (ares->data.address.resource_type ==
+                         ACPI_BUS_NUMBER_RANGE)
+                        type = IORESOURCE_BUS;
+                break;
+        default:
+                break;
+        }
+
+        return (type & types) ? 0 : 1;
+}
+EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 21dac3cb62d2..e818decb631f 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -310,6 +310,14 @@ void acpi_dev_free_resource_list(struct list_head *list);
 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
                            int (*preproc)(struct acpi_resource *, void *),
                            void *preproc_data);
+int acpi_dev_filter_resource_type(struct acpi_resource *ares,
+                                  unsigned long types);
+
+static inline int acpi_dev_filter_resource_type_cb(struct acpi_resource *ares,
+                                                   void *arg)
+{
+        return acpi_dev_filter_resource_type(ares, (unsigned long)arg);
+}
 
 int acpi_check_resource_conflict(const struct resource *res);