[src/trunk]: src/sys/dev/acpi ACPI device handle implementation.

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

details:   https://anonhg.NetBSD.org/src/rev/9db4c393172c
branches:  trunk
changeset: 959227:9db4c393172c
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Fri Feb 05 17:12:43 2021 +0000

description:
ACPI device handle implementation.

diffstat:

 sys/dev/acpi/acpi_util.c |  73 ++++++++++++++++++++++++++++++++++++++++++++++-
 sys/dev/acpi/acpi_util.h |   8 ++++-
 2 files changed, 78 insertions(+), 3 deletions(-)

diffs (116 lines):

diff -r 76803eada158 -r 9db4c393172c sys/dev/acpi/acpi_util.c
--- a/sys/dev/acpi/acpi_util.c  Fri Feb 05 17:03:35 2021 +0000
+++ b/sys/dev/acpi/acpi_util.c  Fri Feb 05 17:12:43 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpi_util.c,v 1.23 2021/01/27 05:11:54 thorpej Exp $ */
+/*     $NetBSD: acpi_util.c,v 1.24 2021/02/05 17:12:43 thorpej 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 1.23 2021/01/27 05:11:54 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_util.c,v 1.24 2021/02/05 17:12:43 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/kmem.h>
@@ -88,6 +88,75 @@
 };
 
 /*
+ * ACPI device handle support.
+ */
+
+static device_call_t
+acpi_devhandle_lookup_device_call(devhandle_t handle, const char *name,
+    devhandle_t *call_handlep)
+{
+       __link_set_decl(acpi_device_calls, struct device_call_descriptor);
+       struct device_call_descriptor * const *desc;
+
+       __link_set_foreach(desc, acpi_device_calls) {
+               if (strcmp((*desc)->name, name) == 0) {
+                       return (*desc)->call;
+               }
+       }
+       return NULL;
+}
+
+static const struct devhandle_impl acpi_devhandle_impl = {
+       .type = DEVHANDLE_TYPE_ACPI,
+       .lookup_device_call = acpi_devhandle_lookup_device_call,
+};
+
+devhandle_t
+devhandle_from_acpi(ACPI_HANDLE const hdl)
+{
+       devhandle_t handle = {
+               .impl = &acpi_devhandle_impl,
+               .pointer = hdl,
+       };
+
+       return handle;
+}
+
+ACPI_HANDLE
+devhandle_to_acpi(devhandle_t const handle)
+{
+       KASSERT(devhandle_type(handle) == DEVHANDLE_TYPE_ACPI);
+
+       return handle.pointer;
+}
+
+static int
+acpi_device_enumerate_children(device_t dev, devhandle_t call_handle, void *v)
+{
+       struct device_enumerate_children_args *args = v;
+       ACPI_HANDLE hdl = devhandle_to_acpi(call_handle);
+       struct acpi_devnode *devnode, *ad;
+
+       devnode = acpi_match_node(hdl);
+       KASSERT(devnode != NULL);
+
+       SIMPLEQ_FOREACH(ad, &devnode->ad_child_head, ad_child_list) {
+               if (ad->ad_devinfo->Type != ACPI_TYPE_DEVICE ||
+                   !acpi_device_present(ad->ad_handle)) {
+                       continue;
+               }
+               if (!args->callback(dev, devhandle_from_acpi(ad->ad_handle),
+                                   args->callback_arg)) {
+                       break;
+               }
+       }
+
+       return 0;
+}
+ACPI_DEVICE_CALL_REGISTER("device-enumerate-children",
+                         acpi_device_enumerate_children)
+
+/*
  * Evaluate an integer object.
  */
 ACPI_STATUS
diff -r 76803eada158 -r 9db4c393172c sys/dev/acpi/acpi_util.h
--- a/sys/dev/acpi/acpi_util.h  Fri Feb 05 17:03:35 2021 +0000
+++ b/sys/dev/acpi/acpi_util.h  Fri Feb 05 17:12:43 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: acpi_util.h,v 1.10 2021/01/26 00:19:53 jmcneill Exp $ */
+/*     $NetBSD: acpi_util.h,v 1.11 2021/02/05 17:12:43 thorpej Exp $ */
 
 /*-
  * Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
@@ -67,6 +67,12 @@
 #ifndef _SYS_DEV_ACPI_ACPI_UTIL_H
 #define _SYS_DEV_ACPI_ACPI_UTIL_H
 
+devhandle_t    devhandle_from_acpi(ACPI_HANDLE);
+ACPI_HANDLE    devhandle_to_acpi(devhandle_t);
+
+#define        ACPI_DEVICE_CALL_REGISTER(_n_, _c_)                             \
+       DEVICE_CALL_REGISTER(acpi_device_calls, _n_, _c_)
+
 ACPI_STATUS    acpi_eval_integer(ACPI_HANDLE, const char *, ACPI_INTEGER *);
 ACPI_STATUS    acpi_eval_set_integer(ACPI_HANDLE handle, const char *path,
                    ACPI_INTEGER arg);