[src/trunk]: src/sys/dev/acpi Add acpi_dsd_integer, which reads an integer va...

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

details:   https://anonhg.NetBSD.org/src/rev/52f12855cb06
branches:  trunk
changeset: 446832:52f12855cb06
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Fri Dec 21 14:51:12 2018 +0000

description:
Add acpi_dsd_integer, which reads an integer value from an ACPI 5.0 _DSD
key/value package list.

diffstat:

 sys/dev/acpi/acpi_util.c |  68 ++++++++++++++++++++++++++++++++++++++++++++++-
 sys/dev/acpi/acpi_util.h |   4 ++-
 2 files changed, 69 insertions(+), 3 deletions(-)

diffs (102 lines):

diff -r fa4beae2a1b0 -r 52f12855cb06 sys/dev/acpi/acpi_util.c
--- a/sys/dev/acpi/acpi_util.c  Fri Dec 21 14:50:18 2018 +0000
+++ b/sys/dev/acpi/acpi_util.c  Fri Dec 21 14:51:12 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpi_util.c,v 1.14 2018/11/16 23:05:50 jmcneill Exp $ */
+/*     $NetBSD: acpi_util.c,v 1.15 2018/12/21 14:51:12 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
@@ -65,7 +65,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi_util.c,v 1.14 2018/11/16 23:05:50 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_util.c,v 1.15 2018/12/21 14:51:12 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/kmem.h>
@@ -607,3 +607,67 @@
 
        return intr_string(ih, buf, size);
 }
+
+/*
+ * USB Device-Specific Data (_DSD) support
+ */
+
+static UINT8 acpi_dsd_uuid[ACPI_UUID_LENGTH] = {
+       0x14, 0xd8, 0xff, 0xda, 0xba, 0x6e, 0x8c, 0x4d,
+       0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01
+};
+
+ACPI_STATUS
+acpi_dsd_integer(ACPI_HANDLE handle, const char *prop, ACPI_INTEGER *val)
+{
+       ACPI_OBJECT *obj, *uuid, *props, *pobj, *propkey, *propval;
+       ACPI_STATUS rv;
+       ACPI_BUFFER buf;
+       int n;
+
+       buf.Pointer = NULL;
+       buf.Length = ACPI_ALLOCATE_BUFFER;
+
+       rv = AcpiEvaluateObjectTyped(handle, "_DSD", NULL, &buf, ACPI_TYPE_PACKAGE);
+       if (ACPI_FAILURE(rv))
+               return rv;
+
+       props = NULL;
+       obj = (ACPI_OBJECT *)buf.Pointer;
+       for (n = 0; (n + 1) < obj->Package.Count; n += 2) {
+               uuid = &obj->Package.Elements[n];
+               if (uuid->Buffer.Length == ACPI_UUID_LENGTH &&
+                   memcmp(uuid->Buffer.Pointer, acpi_dsd_uuid, ACPI_UUID_LENGTH) == 0) {
+                       props = &obj->Package.Elements[n + 1];
+                       break;
+               }
+       }
+       if (props == NULL) {
+               rv = AE_NOT_FOUND;
+               goto done;
+       }
+
+       for (n = 0; n < props->Package.Count; n++) {
+               pobj = &props->Package.Elements[n];
+               if (pobj->Type != ACPI_TYPE_PACKAGE || pobj->Package.Count != 2)
+                       continue;
+               propkey = (ACPI_OBJECT *)&pobj->Package.Elements[0];
+               propval = (ACPI_OBJECT *)&pobj->Package.Elements[1];
+               if (propkey->Type != ACPI_TYPE_STRING)
+                       continue;
+               if (strcmp(propkey->String.Pointer, prop) != 0)
+                       continue;
+
+               if (propval->Type != ACPI_TYPE_INTEGER) {
+                       rv = AE_TYPE;
+               } else {
+                       *val = propval->Integer.Value;
+                       rv = AE_OK;
+               }
+               break;
+       }
+
+done:
+       ACPI_FREE(buf.Pointer);
+       return rv;
+}
diff -r fa4beae2a1b0 -r 52f12855cb06 sys/dev/acpi/acpi_util.h
--- a/sys/dev/acpi/acpi_util.h  Fri Dec 21 14:50:18 2018 +0000
+++ b/sys/dev/acpi/acpi_util.h  Fri Dec 21 14:51:12 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpi_util.h,v 1.6 2018/10/12 23:25:29 jmcneill Exp $ */
+/*     $NetBSD: acpi_util.h,v 1.7 2018/12/21 14:51:12 jmcneill Exp $ */
 
 /*-
  * Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
@@ -88,4 +88,6 @@
 ACPI_HANDLE     acpi_match_cpu_info(struct cpu_info *);
 struct cpu_info *acpi_match_cpu_handle(ACPI_HANDLE);
 
+ACPI_STATUS     acpi_dsd_integer(ACPI_HANDLE, const char *, ACPI_INTEGER *);
+
 #endif /* !_SYS_DEV_ACPI_ACPI_UTIL_H */