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author | Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> | 2015-07-01 09:44:04 +0300 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-07-02 00:17:53 +0300 |
commit | f65358e5724890ef473d28762f6de0f3284b146e (patch) | |
tree | f061b692bf48756d4b4c9cad28419507129c59cb /drivers/acpi/acpica/utids.c | |
parent | cbc823405a48c93a6e98bb97ccdcb23ae034ab93 (diff) | |
download | linux-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.c | 91 |
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); +} |