From 58ff53ec526a4f9da9be099025de08d1f5221a4f Mon Sep 17 00:00:00 2001
From: Alexander Boettcher <alexander.boettcher@genode-labs.com>
Date: Wed, 21 Sep 2022 15:47:15 +0200
Subject: [PATCH] acpica: report S0-S5 sleep state support

Issue #4669
---
 repos/libports/src/app/acpica/os.cc     |  7 +++++
 repos/libports/src/app/acpica/report.cc | 41 +++++++++++++++++++++++++
 repos/libports/src/app/acpica/target.mk |  2 +-
 repos/libports/src/app/acpica/util.h    |  4 +--
 4 files changed, 51 insertions(+), 3 deletions(-)
 create mode 100644 repos/libports/src/app/acpica/report.cc

diff --git a/repos/libports/src/app/acpica/os.cc b/repos/libports/src/app/acpica/os.cc
index 869966a8d2..5ac4a79cf5 100644
--- a/repos/libports/src/app/acpica/os.cc
+++ b/repos/libports/src/app/acpica/os.cc
@@ -129,6 +129,8 @@ struct Acpica::Main
 		void                  *context;
 	} irq_handler;
 
+	Expanding_reporter report_sleep_states { env, "sleep_states", "sleep_states" };
+
 	void init_acpica();
 
 	Main(Env &env)
@@ -415,6 +417,11 @@ void Acpica::Main::init_acpica()
 		error("AcpiGetDevices (FUJ02E3) failed, status=", status);
 		return;
 	}
+
+	/* report S0-S5 support and the SLP_TYPa/b values to be used by kernel(s) */
+	report_sleep_states.generate([&] (auto &xml) {
+		Acpica::generate_suspend_report(xml);
+	});
 }
 
 
diff --git a/repos/libports/src/app/acpica/report.cc b/repos/libports/src/app/acpica/report.cc
new file mode 100644
index 0000000000..1972a57b22
--- /dev/null
+++ b/repos/libports/src/app/acpica/report.cc
@@ -0,0 +1,41 @@
+/*
+ * \brief  Generate XML report
+ * \author Alexander Boettcher
+ */
+
+/*
+ * Copyright (C) 2018-2022 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU Affero General Public License version 3.
+ */
+
+#include <base/env.h>
+#include <os/reporter.h>
+
+#include "util.h"
+
+using namespace Acpica;
+
+using Genode::Reporter;
+
+void Acpica::generate_suspend_report(Reporter::Xml_generator &xml)
+{
+	for (unsigned sleep_state = 1; sleep_state < ACPI_S_STATE_COUNT; sleep_state ++) {
+		UINT8 slp_typa {};
+		UINT8 slp_typb {};
+
+		ACPI_STATUS const result = AcpiGetSleepTypeData (sleep_state,
+		                                                 &slp_typa,
+		                                                 &slp_typb);
+
+		Genode::String<4> const state_name("S", sleep_state);
+		xml.node(state_name.string(), [&] () {
+			xml.attribute("supported", result == AE_OK);
+			if (result == AE_OK) {
+				xml.attribute("SLP_TYPa", slp_typa);
+				xml.attribute("SLP_TYPb", slp_typb);
+			}
+		});
+	}
+}
diff --git a/repos/libports/src/app/acpica/target.mk b/repos/libports/src/app/acpica/target.mk
index 1a09936831..0db7d0f48c 100644
--- a/repos/libports/src/app/acpica/target.mk
+++ b/repos/libports/src/app/acpica/target.mk
@@ -1,5 +1,5 @@
 TARGET   := acpica
-SRC_CC   := os.cc printf.cc
+SRC_CC   := os.cc printf.cc report.cc
 REQUIRES := x86
 LIBS     += base acpica
 
diff --git a/repos/libports/src/app/acpica/util.h b/repos/libports/src/app/acpica/util.h
index 40643e68c9..a37d81f5e1 100644
--- a/repos/libports/src/app/acpica/util.h
+++ b/repos/libports/src/app/acpica/util.h
@@ -17,15 +17,15 @@ extern "C" {
 #include "acpi.h"
 }
 
-class Bridge;
 
 namespace Acpica {
 	template<typename> class Buffer;
 	template<typename> class Callback;
-	void generate_report(Genode::Env &, Bridge *);
 
 	template <typename H, typename S, typename F, typename FSIZE>
 	void for_each_element(H const head, S *, F const &fn, FSIZE const &fn_size);
+
+	void generate_suspend_report(Genode::Reporter::Xml_generator &);
 }
 
 template <typename T>