bluez5: add support for hardware quirk/feature database

Implement hardware quirk/feature database with pattern matching.

spa/plugins/bluez5/backend-hsphfpd.c

@@ -51,6 +51,8 @@ struct impl {
 	struct spa_dbus *dbus;
 	DBusConnection *conn;
 
+	const struct spa_bt_quirks *quirks;
+
 	struct spa_list endpoint_list;
 	bool endpoints_listed;
 
@@ -1485,6 +1487,7 @@ static const struct spa_bt_backend_implementation backend_impl = {
 struct spa_bt_backend *backend_hsphfpd_new(struct spa_bt_monitor *monitor,
 		void *dbus_connection,
 		const struct spa_dict *info,
+		const struct spa_bt_quirks *quirks,
 		const struct spa_support *support,
 	  uint32_t n_support)
 {
@@ -1504,11 +1507,12 @@ struct spa_bt_backend *backend_hsphfpd_new(struct spa_bt_monitor *monitor,
 	spa_bt_backend_set_implementation(&backend->this, &backend_impl, backend);
 
 	backend->monitor = monitor;
+	backend->quirks = quirks;
 	backend->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
 	backend->dbus = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DBus);
 	backend->main_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Loop);
 	backend->conn = dbus_connection;
-	if (info && (str = spa_dict_lookup(info, "bluez5.msbc-support")))
+	if (info && (str = spa_dict_lookup(info, "bluez5.enable-msbc")))
 		backend->msbc_supported = spa_atob(str);
 	else
 		backend->msbc_supported = false;

spa/plugins/bluez5/backend-native.c

@@ -73,6 +73,8 @@ struct impl {
 
 	struct spa_source sco;
 
+	const struct spa_bt_quirks *quirks;
+
 	struct spa_list rfcomm_list;
 	unsigned int defer_setup_enabled:1;
 };
@@ -1925,6 +1927,7 @@ static const struct spa_bt_backend_implementation backend_impl = {
 struct spa_bt_backend *backend_native_new(struct spa_bt_monitor *monitor,
 		void *dbus_connection,
 		const struct spa_dict *info,
+		const struct spa_bt_quirks *quirks,
 		const struct spa_support *support,
 	  uint32_t n_support)
 {
@@ -1941,6 +1944,7 @@ struct spa_bt_backend *backend_native_new(struct spa_bt_monitor *monitor,
 	spa_bt_backend_set_implementation(&backend->this, &backend_impl, backend);
 
 	backend->monitor = monitor;
+	backend->quirks = quirks;
 	backend->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
 	backend->dbus = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DBus);
 	backend->main_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Loop);

spa/plugins/bluez5/backend-ofono.c

@@ -54,6 +54,8 @@ struct impl {
 	struct spa_dbus *dbus;
 	DBusConnection *conn;
 
+	const struct spa_bt_quirks *quirks;
+
 	unsigned int filters_added:1;
 	unsigned int msbc_supported:1;
 };
@@ -769,6 +771,7 @@ static const struct spa_bt_backend_implementation backend_impl = {
 struct spa_bt_backend *backend_ofono_new(struct spa_bt_monitor *monitor,
 		void *dbus_connection,
 		const struct spa_dict *info,
+		const struct spa_bt_quirks *quirks,
 		const struct spa_support *support,
 		uint32_t n_support)
 {
@@ -785,11 +788,12 @@ struct spa_bt_backend *backend_ofono_new(struct spa_bt_monitor *monitor,
 	spa_bt_backend_set_implementation(&backend->this, &backend_impl, backend);
 
 	backend->monitor = monitor;
+	backend->quirks = quirks;
 	backend->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
 	backend->dbus = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DBus);
 	backend->main_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Loop);
 	backend->conn = dbus_connection;
-	if (info && (str = spa_dict_lookup(info, "bluez5.msbc-support")))
+	if (info && (str = spa_dict_lookup(info, "bluez5.enable-msbc")))
 		backend->msbc_supported = spa_atob(str);
 	else
 		backend->msbc_supported = false;

spa/plugins/bluez5/bluez5-dbus.c

@@ -88,6 +88,9 @@ struct spa_bt_monitor {
 	struct spa_dict enabled_codecs;
 
 	unsigned int connection_info_supported:1;
+
+	struct spa_bt_quirks *quirks;
+
 	unsigned int enable_sbc_xq:1;
 	unsigned int backend_native_registered:1;
 	unsigned int backend_ofono_registered:1;
@@ -3842,6 +3845,8 @@ static int impl_clear(struct spa_handle *handle)
 	monitor->backend_ofono_registered = false;
 	monitor->backend_hsphfpd_registered = false;
 
+	spa_bt_quirks_destroy(monitor->quirks);
+
 	return 0;
 }
 
@@ -3986,6 +3991,12 @@ impl_init(const struct spa_handle_factory *factory,
 		return -EINVAL;
 	}
 
+	this->quirks = spa_bt_quirks_create(info, this->log);
+	if (this->quirks == NULL) {
+		spa_log_error(this->log, NAME ": failed to parse quirk table");
+		return -EINVAL;
+	}
+
 	this->dbus_connection = spa_dbus_get_connection(this->dbus, SPA_DBUS_TYPE_SYSTEM);
 	if (this->dbus_connection == NULL) {
 		spa_log_error(this->log, "no dbus connection");
@@ -4027,16 +4038,16 @@ impl_init(const struct spa_handle_factory *factory,
 		    ((tmp =  atoi(str)) > 0))
 			this->default_audio_info.channels = tmp;
 
-		if ((str = spa_dict_lookup(info, "bluez5.sbc-xq-support")) != NULL &&
+		if ((str = spa_dict_lookup(info, "bluez5.enable-sbc-xq")) != NULL &&
 		    spa_atob(str))
 			this->enable_sbc_xq = true;
 	}
 
 	register_media_application(this);
 
-	this->backend_native = backend_native_new(this, this->conn, info, support, n_support);
+	this->backend_native = backend_native_new(this, this->conn, info, this->quirks, support, n_support);
-	this->backend_ofono = backend_ofono_new(this, this->conn, info, support, n_support);
+	this->backend_ofono = backend_ofono_new(this, this->conn, info, this->quirks, support, n_support);
-	this->backend_hsphfpd = backend_hsphfpd_new(this, this->conn, info, support, n_support);
+	this->backend_hsphfpd = backend_hsphfpd_new(this, this->conn, info, this->quirks, support, n_support);
 
 	if (this->backend_ofono && spa_bt_backend_register_profiles(this->backend_ofono) == 0)
 		this->backend_ofono_registered = true;

spa/plugins/bluez5/defs.h

@@ -666,6 +666,23 @@ static inline double spa_bt_volume_hw_to_linear(uint32_t v, uint32_t hw_volume_m
 		0.0, 1.0);
 }
 
+enum spa_bt_feature {
+	SPA_BT_FEATURE_MSBC		= (1 << 0),
+	SPA_BT_FEATURE_MSBC_ALT1	= (1 << 1),
+	SPA_BT_FEATURE_MSBC_ALT1_RTL	= (1 << 2),
+	SPA_BT_FEATURE_HW_VOLUME	= (1 << 3),
+	SPA_BT_FEATURE_SBC_XQ		= (1 << 4),
+};
+
+struct spa_bt_quirks;
+
+struct spa_bt_quirks *spa_bt_quirks_create(const struct spa_dict *info, struct spa_log *log);
+int spa_bt_quirks_get_features(const struct spa_bt_quirks *quirks,
+		const struct spa_bt_adapter *adapter,
+		const struct spa_bt_device *device,
+		uint32_t *features);
+void spa_bt_quirks_destroy(struct spa_bt_quirks *quirks);
+
 struct spa_bt_backend_implementation {
 #define SPA_VERSION_BT_BACKEND_IMPLEMENTATION	0
 	uint32_t version;
@@ -707,6 +724,7 @@ struct spa_bt_backend {
 static inline struct spa_bt_backend *dummy_backend_new(struct spa_bt_monitor *monitor,
 		void *dbus_connection,
 		const struct spa_dict *info,
+		const struct spa_bt_quirks *quirks,
 		const struct spa_support *support,
 		uint32_t n_support)
 {
@@ -717,6 +735,7 @@ static inline struct spa_bt_backend *dummy_backend_new(struct spa_bt_monitor *mo
 struct spa_bt_backend *backend_native_new(struct spa_bt_monitor *monitor,
 		void *dbus_connection,
 		const struct spa_dict *info,
+		const struct spa_bt_quirks *quirks,
 		const struct spa_support *support,
 		uint32_t n_support);
 #else
@@ -728,6 +747,7 @@ struct spa_bt_backend *backend_native_new(struct spa_bt_monitor *monitor,
 struct spa_bt_backend *backend_ofono_new(struct spa_bt_monitor *monitor,
 		void *dbus_connection,
 		const struct spa_dict *info,
+		const struct spa_bt_quirks *quirks,
 		const struct spa_support *support,
 		uint32_t n_support);
 #else
@@ -739,6 +759,7 @@ struct spa_bt_backend *backend_ofono_new(struct spa_bt_monitor *monitor,
 struct spa_bt_backend *backend_hsphfpd_new(struct spa_bt_monitor *monitor,
 		void *dbus_connection,
 		const struct spa_dict *info,
+		const struct spa_bt_quirks *quirks,
 		const struct spa_support *support,
 		uint32_t n_support);
 #else

spa/plugins/bluez5/meson.build

@@ -28,6 +28,7 @@ bluez5_sources = ['plugin.c',
 		  'sco-sink.c',
 		  'sco-source.c',
 		  'sco-io.c',
+		  'quirks.c',
 		  'bluez5-device.c',
 		  'bluez5-dbus.c']
 

spa/plugins/bluez5/quirks.c

@@ -0,0 +1,319 @@
+/* Device/adapter/kernel quirk table
+ *
+ * Copyright © 2021 Pauli Virtanen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <fcntl.h>
+#include <regex.h>
+#include <sys/utsname.h>
+
+#include <bluetooth/bluetooth.h>
+
+#include <dbus/dbus.h>
+
+#include <spa/support/log.h>
+#include <spa/support/loop.h>
+#include <spa/support/dbus.h>
+#include <spa/support/plugin.h>
+#include <spa/monitor/device.h>
+#include <spa/monitor/utils.h>
+#include <spa/utils/hook.h>
+#include <spa/utils/type.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/names.h>
+#include <spa/utils/result.h>
+#include <spa/utils/json.h>
+#include <spa/utils/string.h>
+
+#include "a2dp-codecs.h"
+#include "defs.h"
+
+#define NAME "bluez5-quirks"
+
+struct spa_bt_quirks {
+	struct spa_log *log;
+
+	int force_msbc;
+	int force_hw_volume;
+	int force_sbc_xq;
+
+	char *device_rules;
+	char *adapter_rules;
+	char *kernel_rules;
+};
+
+static enum spa_bt_feature parse_feature(const char *str)
+{
+	static const struct { const char *key; enum spa_bt_feature value; } feature_keys[] = {
+		{ "msbc", SPA_BT_FEATURE_MSBC },
+		{ "msbc-alt1", SPA_BT_FEATURE_MSBC_ALT1 },
+		{ "msbc-alt1-rtl", SPA_BT_FEATURE_MSBC_ALT1_RTL },
+		{ "hw-volume", SPA_BT_FEATURE_HW_VOLUME },
+		{ "sbc-xq", SPA_BT_FEATURE_SBC_XQ },
+	};
+	size_t i;
+	for (i = 0; i < SPA_N_ELEMENTS(feature_keys); ++i) {
+		if (spa_streq(str, feature_keys[i].key))
+			return feature_keys[i].value;
+	}
+	return 0;
+}
+
+static int do_match(const char *rules, struct spa_dict *dict, uint32_t *no_features)
+{
+	struct spa_json rules_json = SPA_JSON_INIT(rules, strlen(rules));
+	struct spa_json rules_arr, it[2];
+
+	if (spa_json_enter_array(&rules_json, &rules_arr) <= 0)
+		return 1;
+
+	while (spa_json_enter_object(&rules_arr, &it[0]) > 0) {
+		char key[256];
+		int match = true;
+		uint32_t no_features_cur = 0;
+
+		while (spa_json_get_string(&it[0], key, sizeof(key)-1) > 0) {
+			char val[4096];
+			const char *str, *value;
+			int len;
+			bool success = false;
+
+			if (spa_streq(key, "no-features")) {
+				if (spa_json_enter_array(&it[0], &it[1]) > 0) {
+					while (spa_json_get_string(&it[1], val, sizeof(val)-1) > 0)
+						no_features_cur |= parse_feature(val);
+				}
+				continue;
+			}
+
+			if ((len = spa_json_next(&it[0], &value)) <= 0)
+				break;
+
+			if (spa_json_is_null(value, len)) {
+				value = NULL;
+			} else {
+				spa_json_parse_string(value, SPA_MIN(len, (int)sizeof(val)-1), val);
+				value = val;
+			}
+
+			str = spa_dict_lookup(dict, key);
+			if (value == NULL) {
+				success = str == NULL;
+			} else if (str != NULL) {
+				if (value[0] == '~') {
+					regex_t r;
+					if (regcomp(&r, value+1, REG_EXTENDED | REG_NOSUB) == 0) {
+						if (regexec(&r, str, 0, NULL, 0) == 0)
+							success = true;
+						regfree(&r);
+					}
+				} else if (spa_streq(str, value)) {
+					success = true;
+				}
+			}
+
+			if (!success) {
+				match = false;
+				break;
+			}
+		}
+
+		if (match) {
+			*no_features = no_features_cur;
+			return 0;
+		}
+	}
+	return 0;
+}
+
+static int parse_force_flag(const struct spa_dict *info, const char *key)
+{
+	const char *str;
+	str = spa_dict_lookup(info, key);
+	if (str == NULL)
+		return -1;
+	else
+		return (strcmp(str, "true") == 0 || atoi(str)) ? 1 : 0;
+}
+
+struct spa_bt_quirks *spa_bt_quirks_create(const struct spa_dict *info, struct spa_log *log)
+{
+	struct spa_bt_quirks *this;
+	const char *str;
+
+	if (!info) {
+		errno = -EINVAL;
+		return NULL;
+	}
+
+	this = calloc(1, sizeof(struct spa_bt_quirks));
+	if (this == NULL)
+		return NULL;
+
+	this->log = log;
+
+	this->force_sbc_xq = parse_force_flag(info, "bluez5.enable-sbc-xq");
+	this->force_msbc = parse_force_flag(info, "bluez5.enable-msbc");
+	this->force_hw_volume = parse_force_flag(info, "bluez5.enable-hw-volume");
+
+	str = spa_dict_lookup(info, "bluez5.features.kernel");
+	this->kernel_rules = str ? strdup(str) : NULL;
+	str = spa_dict_lookup(info, "bluez5.features.adapter");
+	this->adapter_rules = str ? strdup(str) : NULL;
+	str = spa_dict_lookup(info, "bluez5.features.device");
+	this->device_rules = str ? strdup(str) : NULL;
+
+	if (!(this->kernel_rules && this->adapter_rules && this->device_rules))
+		spa_log_info(this->log, NAME " failed to find data from bluez-hardware.conf");
+
+	return this;
+}
+
+void spa_bt_quirks_destroy(struct spa_bt_quirks *this)
+{
+	free(this->kernel_rules);
+	free(this->adapter_rules);
+	free(this->device_rules);
+	free(this);
+}
+
+static void log_props(struct spa_log *log, const struct spa_dict *dict)
+{
+	const struct spa_dict_item *item;
+	spa_dict_for_each(item, dict)
+		spa_log_debug(log, "quirk property %s=%s", item->key, item->value);
+}
+
+static void strtolower(char *src, char *dst, int maxsize)
+{
+	while (maxsize > 1 && *src != '\0') {
+		*dst = (*src >= 'A' && *src <= 'Z') ? ('a' + (*src - 'A')) : *src;
+		++src;
+		++dst;
+		--maxsize;
+	}
+	if (maxsize > 0)
+		*dst = '\0';
+}
+
+int spa_bt_quirks_get_features(const struct spa_bt_quirks *this,
+		const struct spa_bt_adapter *adapter,
+		const struct spa_bt_device *device,
+		uint32_t *features)
+{
+	struct spa_dict props;
+	struct spa_dict_item items[5];
+	int res;
+
+	*features = ~(uint32_t)0;
+
+	/* Kernel */
+	if (this->kernel_rules) {
+		uint32_t no_features = 0;
+		int nitems = 0;
+		struct utsname name;
+		if ((res = uname(&name)) < 0)
+			return res;
+		items[nitems++] = SPA_DICT_ITEM_INIT("sysname", name.sysname);
+		items[nitems++] = SPA_DICT_ITEM_INIT("release", name.release);
+		items[nitems++] = SPA_DICT_ITEM_INIT("version", name.version);
+		props = SPA_DICT_INIT(items, nitems);
+		log_props(this->log, &props);
+		do_match(this->kernel_rules, &props, &no_features);
+		spa_log_debug(this->log, NAME ": kernel quirks:%08x", no_features);
+		*features &= ~no_features;
+	}
+
+	/* Adapter */
+	if (this->adapter_rules) {
+		uint32_t no_features = 0;
+		int nitems = 0;
+		char vendor_id[64], product_id[64], address[64];
+
+		if (spa_bt_format_vendor_product_id(
+				adapter->source_id, adapter->vendor_id, adapter->product_id,
+				vendor_id, sizeof(vendor_id), product_id, sizeof(product_id)) == 0) {
+			items[nitems++] = SPA_DICT_ITEM_INIT("vendor-id", vendor_id);
+			items[nitems++] = SPA_DICT_ITEM_INIT("product-id", product_id);
+		}
+		items[nitems++] = SPA_DICT_ITEM_INIT("bus-type",
+				(adapter->bus_type == BUS_TYPE_USB) ? "usb" : "other");
+		if (adapter->address) {
+			strtolower(adapter->address, address, sizeof(address));
+			items[nitems++] = SPA_DICT_ITEM_INIT("address", address);
+		}
+		props = SPA_DICT_INIT(items, nitems);
+		log_props(this->log, &props);
+		do_match(this->adapter_rules, &props, &no_features);
+		spa_log_debug(this->log, NAME ": adapter quirks:%08x", no_features);
+		*features &= ~no_features;
+	}
+
+	/* Device */
+	if (this->device_rules) {
+		uint32_t no_features = 0;
+		int nitems = 0;
+		char vendor_id[64], product_id[64], version_id[64], address[64];
+		if (spa_bt_format_vendor_product_id(
+				device->source_id, device->vendor_id, device->product_id,
+				vendor_id, sizeof(vendor_id), product_id, sizeof(product_id)) == 0) {
+			snprintf(version_id, sizeof(version_id), "%04x",
+					(unsigned int)device->version_id);
+			items[nitems++] = SPA_DICT_ITEM_INIT("vendor-id", vendor_id);
+			items[nitems++] = SPA_DICT_ITEM_INIT("product-id", product_id);
+			items[nitems++] = SPA_DICT_ITEM_INIT("version-id", version_id);
+		}
+		if (device->name)
+			items[nitems++] = SPA_DICT_ITEM_INIT("name", device->name);
+		if (device->address) {
+			strtolower(device->address, address, sizeof(address));
+			items[nitems++] = SPA_DICT_ITEM_INIT("address", address);
+		}
+		props = SPA_DICT_INIT(items, nitems);
+		log_props(this->log, &props);
+		do_match(this->device_rules, &props, &no_features);
+		spa_log_debug(this->log, NAME ": device quirks:%08x", no_features);
+		*features &= ~no_features;
+	}
+
+	/* Force flags */
+	if (this->force_msbc != -1) {
+		SPA_FLAG_UPDATE(*features, SPA_BT_FEATURE_MSBC, this->force_msbc);
+		SPA_FLAG_UPDATE(*features, SPA_BT_FEATURE_MSBC_ALT1, this->force_msbc);
+		SPA_FLAG_UPDATE(*features, SPA_BT_FEATURE_MSBC_ALT1_RTL, this->force_msbc);
+	}
+
+	if (this->force_hw_volume != -1)
+		SPA_FLAG_UPDATE(*features, SPA_BT_FEATURE_HW_VOLUME, this->force_hw_volume);
+
+	if (this->force_sbc_xq != -1)
+		SPA_FLAG_UPDATE(*features, SPA_BT_FEATURE_SBC_XQ, this->force_sbc_xq);
+
+	return 0;
+}

src/daemon/media-session.d/bluez-monitor.conf

@@ -7,10 +7,11 @@
 properties = {
     # These features do not work on all headsets, so they are enabled
     # by default based on the hardware database. They can also be
-    # forced on/off by the following options:
+    # forced on/off for all devices by the following options:
 
-    #bluez5.force-sbc-xq = true
+    #bluez5.enable-sbc-xq = true
-    #bluez5.force-msbc = true
+    #bluez5.enable-msbc = true
+    #bluez5.enable-hw-volume = true
 
     # See bluez-hardware.conf for the hardware database.
 
@@ -62,10 +63,7 @@ rules = [
                 #]
                 bluez5.auto-connect  = [ hfp_hf hsp_hs a2dp_sink ]
 
-                # Overload mSBC support for native backend and a specific device.
+                # Hardware volume control (default: all)
-                #bluez5.msbc-support = false
-
-                # Hardware volume control (default: [ hfp_ag hsp_ag a2dp_source ])
                 #bluez5.hw-volume = [
                 #    hfp_hf
                 #    hsp_hs

src/examples/media-session/bluez-monitor.c

@@ -49,6 +49,7 @@
 
 #define NAME		"bluez5-monitor"
 #define SESSION_CONF	"bluez-monitor.conf"
+#define FEATURES_CONF	"bluez-hardware.conf"
 
 struct device;
 
@@ -715,7 +716,9 @@ int sm_bluez5_monitor_start(struct sm_media_session *session)
 {
 	int res;
 	struct impl *impl;
-	const char *str;
+	const char *key, *str;
+	struct pw_properties *hw_features = NULL;
+	void *state = NULL;
 
 	impl = calloc(1, sizeof(struct impl));
 	if (impl == NULL) {
@@ -731,9 +734,16 @@ int sm_bluez5_monitor_start(struct sm_media_session *session)
 		res = -errno;
 		goto out_free;
 	}
+	if ((hw_features = pw_properties_new(NULL, NULL)) == NULL) {
+		res = -errno;
+		goto out_free;
+	}
 	if ((res = sm_media_session_load_conf(impl->session,
 					SESSION_CONF, impl->conf)) < 0)
 		pw_log_info("can't load "SESSION_CONF" config: %s", spa_strerror(res));
+	if ((res = sm_media_session_load_conf(impl->session,
+					FEATURES_CONF, hw_features)) < 0)
+		pw_log_info("can't load "FEATURES_CONF" config: %s", spa_strerror(res));
 
 	if ((impl->props = pw_properties_new(NULL, NULL)) == NULL) {
 		res = -errno;
@@ -744,14 +754,23 @@ int sm_bluez5_monitor_start(struct sm_media_session *session)
 
 	pw_properties_set(impl->props, "api.bluez5.connection-info", "true");
 
+	while ((key = pw_properties_iterate(hw_features, &state)) != NULL) {
+		if (strncmp(key, "bluez5.features.", strlen("bluez5.features.")) != 0)
+			continue;
+		if ((str = pw_properties_get(hw_features, key)) != NULL)
+			pw_properties_set(impl->props, key, str);
+	}
+
+	pw_properties_free(hw_features);
+
 	sm_media_session_add_listener(session, &impl->session_listener,
 			&session_events, impl);
-
 	return 0;
 
 out_free:
 	pw_properties_free(impl->conf);
 	pw_properties_free(impl->props);
+	pw_properties_free(hw_features);
 	free(impl);
 out:
 	return res;