[PATCH V2 2/4] ACPI: Add _PLD support

Matthew Garrett
2012-03-12T21:45:59Z

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 | 29 +++++++++++++++++++++++++++++
include/acpi/acpi_bus.h | 31 +++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index b002a47..5c320a0 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -382,3 +382,32 @@ 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_PACKAGE
+ || !output->package.count
+ || output->package.elements[0].type != ACPI_TYPE_BUFFER
+ || output->package.elements[0].buffer.length > sizeof(*pld)) {
+ status = AE_TYPE;
+ goto out;
+ }
+
+ memcpy(pld, output->package.elements[0].buffer.pointer,
+ output->package.elements[0].buffer.length);
+out:
+ kfree(buffer.pointer);
+ return status;
+}
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 6cd5b64..39d7de9 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -51,6 +51,37 @@ acpi_evaluate_reference(acpi_handle handle,
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>
--
1.7.9.3