Add a simple helper function to allow drivers to obtain the physical
device location data.
Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx>
---
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
--
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