[RFC V3 PATCH 01/13] acpi: Implement control method sleep button

[Annie Li <annie.li@oracle.com>]

The fixed hardware sleep button isn't appropriate for hardware
reduced platform. This patch implements the control method sleep
button in a separate source file so that the button can be added
for various platforms.

Co-developed-by: Miguel Luis <miguel.luis@oracle.com>
Signed-off-by: Annie Li <annie.li@oracle.com>
---
 hw/acpi/control_method_device.c         | 33 +++++++++++++++++++++++++
 hw/acpi/meson.build                     |  1 +
 include/hw/acpi/control_method_device.h | 21 ++++++++++++++++
 3 files changed, 55 insertions(+)

diff --git a/hw/acpi/control_method_device.c b/hw/acpi/control_method_device.c
new file mode 100644
index 0000000000..c3b1d484c4
--- /dev/null
+++ b/hw/acpi/control_method_device.c
@@ -0,0 +1,33 @@
+/*
+ * Control Method Device
+ *
+ * Copyright (c) 2023 Oracle and/or its affiliates.
+ *
+ *
+ * Authors:
+ *     Annie Li <annie.li@oracle.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+#include "hw/acpi/control_method_device.h"
+#include "hw/mem/nvdimm.h"
+
+/*
+ * The control method sleep button[ACPI v6.5 Section 4.8.2.2.2.2]
+ * resides in generic hardware address spaces. The sleep button
+ * is defined as _HID("PNP0C0E") that associates with device "SLPB".
+ */
+void acpi_dsdt_add_sleep_button(Aml *scope)
+{
+    Aml *dev = aml_device(ACPI_SLEEP_BUTTON_DEVICE);
+    aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0C0E")));
+    aml_append(dev, aml_operation_region("\\SLP", AML_SYSTEM_IO,
+                                         aml_int(0x201), 0x1));
+    Aml *field = aml_field("\\SLP", AML_BYTE_ACC, AML_NOLOCK,
+                           AML_WRITE_AS_ZEROS);
+    aml_append(field, aml_named_field("SBP", 1));
+    aml_append(dev, field);
+    aml_append(scope, dev);
+}
diff --git a/hw/acpi/meson.build b/hw/acpi/meson.build
index 73f02b9691..a62e625cef 100644
--- a/hw/acpi/meson.build
+++ b/hw/acpi/meson.build
@@ -17,6 +17,7 @@ acpi_ss.add(when: 'CONFIG_ACPI_CXL', if_true: files('cxl.c'), if_false: files('c
 acpi_ss.add(when: 'CONFIG_ACPI_VMGENID', if_true: files('vmgenid.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_VMCLOCK', if_true: files('vmclock.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_HW_REDUCED', if_true: files('generic_event_device.c'))
+acpi_ss.add(when: 'CONFIG_ACPI_HW_REDUCED', if_true: files('control_method_device.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_HMAT', if_true: files('hmat.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_APEI', if_true: files('ghes.c'), if_false: files('ghes-stub.c'))
 acpi_ss.add(when: 'CONFIG_ACPI_PIIX4', if_true: files('piix4.c'))
diff --git a/include/hw/acpi/control_method_device.h b/include/hw/acpi/control_method_device.h
new file mode 100644
index 0000000000..079f1a74dd
--- /dev/null
+++ b/include/hw/acpi/control_method_device.h
@@ -0,0 +1,21 @@
+/*
+ * Control Method Device
+ *
+ * Copyright (c) 2023 Oracle and/or its affiliates.
+ *
+ *
+ * Authors:
+ *     Annie Li <annie.li@oracle.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+
+#ifndef HW_ACPI_CONTROL_METHOD_DEVICE_H
+#define HW_ACPI_CONTROL_NETHOD_DEVICE_H
+
+#define ACPI_SLEEP_BUTTON_DEVICE "SLPB"
+
+void acpi_dsdt_add_sleep_button(Aml *scope);
+
+#endif
-- 
2.43.5