From b6912a3d8746eb6a015685b3d0c3e26ae474dc68 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Josef=20S=C3=B6ntgen?= <josef.soentgen@genode-labs.com>
Date: Mon, 21 Sep 2020 17:38:54 +0200
Subject: [PATCH] dde_bsd: query initial head-phone state

Account for the situation where the driver is started while the HP
is already plugged in and configure the mixer accordingly.

Thanks to Peter for the patch.

Issue #3929.
---
 repos/dde_bsd/src/lib/audio/driver.cc         | 37 ++++++++++++++++++-
 .../dde_bsd/src/lib/audio/include/bsd_emul.h  |  3 +-
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/repos/dde_bsd/src/lib/audio/driver.cc b/repos/dde_bsd/src/lib/audio/driver.cc
index d323867e0d..bf8311fef3 100644
--- a/repos/dde_bsd/src/lib/audio/driver.cc
+++ b/repos/dde_bsd/src/lib/audio/driver.cc
@@ -216,7 +216,7 @@ static bool set_mixer_value(Mixer &mixer, char const * const field,
 }
 
 
-static char const *get_mixer_value(mixer_devinfo_t *info)
+static char const *get_mixer_value(mixer_devinfo_t const *info)
 {
 	static char buffer[128];
 
@@ -272,6 +272,33 @@ static char const *get_mixer_value(mixer_devinfo_t *info)
 }
 
 
+static bool headphone_plugged()
+{
+	for (unsigned i = 0; i < mixer.num; i++) {
+		mixer_devinfo_t const &info = mixer.info[i];
+
+		if (info.type == AUDIO_MIXER_CLASS) {
+			continue;
+		}
+
+		unsigned     const mixer_class = info.mixer_class;
+		char const * const class_name  = mixer.info[mixer_class].label.name;
+		char const * const name        = info.label.name;
+
+		Genode::String<64> const control { class_name, ".", name };
+		if (control != "outputs.hp_sense") {
+			continue;
+		}
+
+		auto const result = get_mixer_value(&info);
+
+		return Genode::strcmp("plugged", result) == 0;
+	}
+
+	return false;
+}
+
+
 static void dump_mixer(Mixer const &mixer)
 {
 	Genode::log("--- mixer information ---");
@@ -406,6 +433,8 @@ static bool configure_audio_device(Genode::Env &env, dev_t dev, Genode::Xml_node
 
 	configure_mixer(env, mixer, config);
 
+	notify_hp_sense(headphone_plugged() ? 1: 0);
+
 	return true;
 }
 
@@ -561,6 +590,12 @@ extern "C" void notify_record()
 }
 
 
+extern "C" void notify_hp_sense(int const sense)
+{
+	set_mixer_value(mixer, "record.adc-0:1_source", sense ? "mic2" : "mic");
+}
+
+
 /*****************************
  ** private Audio namespace **
  *****************************/
diff --git a/repos/dde_bsd/src/lib/audio/include/bsd_emul.h b/repos/dde_bsd/src/lib/audio/include/bsd_emul.h
index adfee55321..379ed9afeb 100644
--- a/repos/dde_bsd/src/lib/audio/include/bsd_emul.h
+++ b/repos/dde_bsd/src/lib/audio/include/bsd_emul.h
@@ -8,7 +8,7 @@
  */
 
 /*
- * Copyright (C) 2014-2017 Genode Labs GmbH
+ * Copyright (C) 2014-2020 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.
@@ -28,6 +28,7 @@
 
 void notify_play();
 void notify_record();
+void notify_hp_sense(int const);
 
 
 /*****************