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authorSuravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>2015-07-01 09:44:04 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-07-02 00:17:53 +0300
commitf65358e5724890ef473d28762f6de0f3284b146e (patch)
treef061b692bf48756d4b4c9cad28419507129c59cb /drivers/acpi/acpica/utids.c
parentcbc823405a48c93a6e98bb97ccdcb23ae034ab93 (diff)
downloadlinux-f65358e5724890ef473d28762f6de0f3284b146e.tar.xz
ACPICA: Utilities: Add _CLS processing
ACPICA commit 9a2b638acb3a7215209432e070c6bd0312374229 ACPI Device object often contains a _CLS object to supply PCI-defined class code for the device. This patch introduces logic to process the _CLS object. Suravee Suthikulpanit, Lv Zheng. Link: https://github.com/acpica/acpica/commit/9a2b638a Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/utids.c')
-rw-r--r--drivers/acpi/acpica/utids.c91
1 files changed, 90 insertions, 1 deletions
diff --git a/drivers/acpi/acpica/utids.c b/drivers/acpi/acpica/utids.c
index 27431cfc1c44..3afe07f19b9f 100644
--- a/drivers/acpi/acpica/utids.c
+++ b/drivers/acpi/acpica/utids.c
@@ -1,6 +1,6 @@
/******************************************************************************
*
- * Module Name: utids - support for device Ids - HID, UID, CID
+ * Module Name: utids - support for device Ids - HID, UID, CID, SUB, CLS
*
*****************************************************************************/
@@ -416,3 +416,92 @@ cleanup:
acpi_ut_remove_reference(obj_desc);
return_ACPI_STATUS(status);
}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_execute_CLS
+ *
+ * PARAMETERS: device_node - Node for the device
+ * return_id - Where the _CLS is returned
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Executes the _CLS control method that returns PCI-defined
+ * class code of the device. The _CLS value is always a package
+ * containing PCI class information as a list of integers.
+ * The returned string has format "BBSSPP", where:
+ * BB = Base-class code
+ * SS = Sub-class code
+ * PP = Programming Interface code
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_execute_CLS(struct acpi_namespace_node *device_node,
+ struct acpi_pnp_device_id **return_id)
+{
+ union acpi_operand_object *obj_desc;
+ union acpi_operand_object **cls_objects;
+ u32 count;
+ struct acpi_pnp_device_id *cls;
+ u32 length;
+ acpi_status status;
+ u8 class_code[3] = { 0, 0, 0 };
+
+ ACPI_FUNCTION_TRACE(ut_execute_CLS);
+
+ status = acpi_ut_evaluate_object(device_node, METHOD_NAME__CLS,
+ ACPI_BTYPE_PACKAGE, &obj_desc);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Get the size of the String to be returned, includes null terminator */
+
+ length = ACPI_PCICLS_STRING_SIZE;
+ cls_objects = obj_desc->package.elements;
+ count = obj_desc->package.count;
+
+ if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
+ if (count > 0
+ && cls_objects[0]->common.type == ACPI_TYPE_INTEGER) {
+ class_code[0] = (u8)cls_objects[0]->integer.value;
+ }
+ if (count > 1
+ && cls_objects[1]->common.type == ACPI_TYPE_INTEGER) {
+ class_code[1] = (u8)cls_objects[1]->integer.value;
+ }
+ if (count > 2
+ && cls_objects[2]->common.type == ACPI_TYPE_INTEGER) {
+ class_code[2] = (u8)cls_objects[2]->integer.value;
+ }
+ }
+
+ /* Allocate a buffer for the CLS */
+
+ cls =
+ ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pnp_device_id) +
+ (acpi_size) length);
+ if (!cls) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+
+ /* Area for the string starts after PNP_DEVICE_ID struct */
+
+ cls->string =
+ ACPI_ADD_PTR(char, cls, sizeof(struct acpi_pnp_device_id));
+
+ /* Simply copy existing string */
+
+ acpi_ex_pci_cls_to_string(cls->string, class_code);
+ cls->length = length;
+ *return_id = cls;
+
+cleanup:
+
+ /* On exit, we must delete the return object */
+
+ acpi_ut_remove_reference(obj_desc);
+ return_ACPI_STATUS(status);
+}