[src/trunk]: src/sys/dev/acpi acpi: Add helper for querying DSM function 0.

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c9a10be22425
branches:  trunk
changeset: 359648:c9a10be22425
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Jan 15 14:40:22 2022 +0000

description:
acpi: Add helper for querying DSM function 0.

diffstat:

 sys/dev/acpi/acpi_util.c |  36 ++++++++++++++++++++++++++++++++++--
 sys/dev/acpi/acpi_util.h |   4 +++-
 2 files changed, 37 insertions(+), 3 deletions(-)

diffs (75 lines):

diff -r c3ac7079aa3e -r c9a10be22425 sys/dev/acpi/acpi_util.c
--- a/sys/dev/acpi/acpi_util.c  Sat Jan 15 14:33:36 2022 +0000
+++ b/sys/dev/acpi/acpi_util.c  Sat Jan 15 14:40:22 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpi_util.c,v 1.30 2022/01/09 14:28:23 jmcneill Exp $ */
+/*     $NetBSD: acpi_util.c,v 1.31 2022/01/15 14:40:22 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2003, 2007, 2021 The NetBSD Foundation, Inc.
@@ -65,7 +65,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi_util.c,v 1.30 2022/01/09 14:28:23 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_util.c,v 1.31 2022/01/15 14:40:22 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/kmem.h>
@@ -1117,6 +1117,38 @@
 }
 
 ACPI_STATUS
+acpi_dsm_query(ACPI_HANDLE handle, uint8_t *uuid, ACPI_INTEGER rev,
+    ACPI_INTEGER *ret)
+{
+       ACPI_OBJECT *obj;
+       ACPI_STATUS status;
+       uint8_t *data;
+       u_int n;
+
+       status = acpi_dsm(handle, uuid, rev, 0, NULL, &obj);
+       if (ACPI_FAILURE(status)) {
+               return status;
+       }
+
+       if (obj->Type == ACPI_TYPE_INTEGER) {
+               *ret = obj->Integer.Value;
+       } else if (obj->Type == ACPI_TYPE_BUFFER &&
+                  obj->Buffer.Length <= 8) {
+               *ret = 0;
+               data = (uint8_t *)obj->Buffer.Pointer;
+               for (n = 0; n < obj->Buffer.Length; n++) {
+                       *ret |= (uint64_t)data[n] << (n * 8);
+               }
+       } else {
+               status = AE_TYPE;
+       }
+
+       ACPI_FREE(obj);
+
+       return status;
+}
+
+ACPI_STATUS
 acpi_claim_childdevs(device_t dev, struct acpi_devnode *devnode)
 {
        struct acpi_devnode *ad;
diff -r c3ac7079aa3e -r c9a10be22425 sys/dev/acpi/acpi_util.h
--- a/sys/dev/acpi/acpi_util.h  Sat Jan 15 14:33:36 2022 +0000
+++ b/sys/dev/acpi/acpi_util.h  Sat Jan 15 14:40:22 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpi_util.h,v 1.12 2022/01/09 14:28:23 jmcneill Exp $ */
+/*     $NetBSD: acpi_util.h,v 1.13 2022/01/15 14:40:33 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
@@ -108,6 +108,8 @@
 ACPI_STATUS     acpi_dsm_integer(ACPI_HANDLE, uint8_t *, ACPI_INTEGER,
                        ACPI_INTEGER, const ACPI_OBJECT *,
                        ACPI_INTEGER *);
+ACPI_STATUS     acpi_dsm_query(ACPI_HANDLE, uint8_t *, ACPI_INTEGER,
+                       ACPI_INTEGER *);
 
 ACPI_STATUS     acpi_claim_childdevs(device_t, struct acpi_devnode *);