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Commit 38ac0f1b authored by Matthew Garrett's avatar Matthew Garrett Committed by Greg Kroah-Hartman
Browse files

ACPI: Add _PLD support 



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

Acked-by: default avatarLen Brown <len.brown@intel.com>
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
Signed-off-by: default avatarLan Tianyu <tianyu.lan@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 66886d6f

drivers/acpi/utils.c

+30 −0
Original line number Diff line number Diff line
@@ -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);

include/acpi/acpi_bus.h

+31 −0
Original line number Diff line number Diff line
@@ -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>