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ACPI: Add _PLD support 

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

Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthew Garrett 2012-05-11 16:08:26 +08:00 committed by Greg Kroah-Hartman
parent 66886d6f8c
commit 38ac0f1b90
2 changed files with 61 additions and 0 deletions
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30
drivers/acpi/utils.c
View File

@ -382,3 +382,33 @@ 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;
}
EXPORT_SYMBOL(acpi_get_physical_device_location);

31
include/acpi/acpi_bus.h
View File

@ -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 */
} __attribute__((__packed__));
acpi_status
acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld *pld);
#ifdef CONFIG_ACPI
#include <linux/proc_fs.h>