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>

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index 1c3abae..3ea0d17 100644 (file)
--- 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 21dac3c..e818dec 100644 (file)
--- 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);