[PATCH 2/2] ACPI: Add _PLD support

[Matthew Garrett <mjg@redhat.com>]

Add a simple helper function to allow drivers to obtain the physical
device location data.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
---
 drivers/acpi/utils.c    |   25 +++++++++++++++++++++++++
 include/acpi/acpi_bus.h |   33 ++++++++++++++++++++++++++++++++-
 2 files changed, 57 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index b002a47..159207e 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -382,3 +382,28 @@ acpi_evaluate_reference(acpi_handle handle,
 }
 
 EXPORT_SYMBOL(acpi_evaluate_reference);
+
+acpi_status
+acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld)
+{
+	acpi_status status;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	union acpi_object *output;
+
+	status = acpi_evaluate_object(handle, "_PLD", NULL, &buffer);
+
+	if (ACPI_FAILURE(status))
+		return status;
+
+	output = buffer.pointer;
+
+	if (!output || (output->type != ACPI_TYPE_BUFFER)) {
+		status = AE_TYPE;
+		goto out;
+	}
+
+	memcpy(pld, output->buffer.pointer, output->buffer.length);
+out:
+	kfree (buffer.pointer);
+	return status;
+}
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 6cd5b64..30a9250 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -48,9 +48,40 @@ acpi_evaluate_integer(acpi_handle handle,
 acpi_status
 acpi_evaluate_reference(acpi_handle handle,
 			acpi_string pathname,
-			struct acpi_object_list *arguments,
+			struct acpi_object_list *arguments,		
 			struct acpi_handle_list *list);
 
+struct acpi_pld {
+        unsigned int revision :7; /* 0 */
+        unsigned int ignore_colour :1; /* 7 */
+        unsigned int colour :24; /* 8 */
+        unsigned int width :16; /* 32 */
+        unsigned int height :16; /* 48 */
+        unsigned int user_visible :1; /* 64 */
+        unsigned int dock :1; /* 65 */
+        unsigned int lid :1; /* 66 */
+        unsigned int panel :3; /* 67 */
+        unsigned int vertical_pos :2; /* 70 */
+        unsigned int horizontal_pos :2; /* 72 */
+        unsigned int shape :4; /* 74 */
+        unsigned int group_orientation :1; /* 78 */
+        unsigned int group_token :8; /* 79 */
+        unsigned int group_position :8; /* 87 */
+        unsigned int bay :1; /* 95 */
+        unsigned int ejectable :1; /* 96 */
+        unsigned int ospm_eject_required :1; /* 97 */
+        unsigned int cabinet_number :8; /* 98 */
+        unsigned int card_cage_number :8; /* 106 */
+        unsigned int reference :1; /* 114 */
+        unsigned int rotation :4; /* 115 */
+        unsigned int order :5; /* 119 */
+        unsigned int reserved :4; /* 124 */
+        unsigned int vertical_offset :16; /* 128 */
+        unsigned int horizontal_offset :16; /* 144 */
+};
+
+acpi_status
+acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld);
 #ifdef CONFIG_ACPI
 
 #include <linux/proc_fs.h>
-- 
1.7.6.4