[RFC next v0 01/11] bluetooth: Add backend infrastructure with core->backend reporting

[mikel.astiz.oss@xxxxxxxxx (Mikel Astiz)]

From: Mikel Astiz <mikel.astiz@xxxxxxxxxxxx>

Components other than BlueZ can also implement Bluetooth profiles and
some infrastructure is required to keep the codebase cleanly split.
---
 src/modules/bluetooth/bluetooth-util.c | 32 ++++++++++++++++++++++++++++++++
 src/modules/bluetooth/bluetooth-util.h | 12 ++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/src/modules/bluetooth/bluetooth-util.c b/src/modules/bluetooth/bluetooth-util.c
index 5924736..b8fe450 100644
--- a/src/modules/bluetooth/bluetooth-util.c
+++ b/src/modules/bluetooth/bluetooth-util.c
@@ -91,6 +91,11 @@ typedef enum pa_bluez_version {
     BLUEZ_VERSION_5,
 } pa_bluez_version_t;
 
+struct profile_data {
+    pa_bluetooth_backend *backend;
+    void *backend_private;
+};
+
 struct pa_bluetooth_discovery {
     PA_REFCNT_DECLARE;
 
@@ -101,6 +106,7 @@ struct pa_bluetooth_discovery {
     bool adapters_listed;
     pa_hashmap *devices;
     pa_hashmap *transports;
+    struct profile_data profiles[PA_BLUETOOTH_PROFILE_COUNT];
     pa_hook hooks[PA_BLUETOOTH_HOOK_MAX];
     bool filter_added;
 };
@@ -2281,3 +2287,29 @@ bool pa_bluetooth_uuid_has(pa_bluetooth_uuid *uuids, const char *uuid) {
 
     return false;
 }
+
+int pa_bt_backend_register(pa_bluetooth_discovery *y, pa_bluetooth_backend *b, enum profile p, void *bp) {
+    pa_assert(y);
+    pa_assert(b);
+
+    if (y->profiles[p].backend) {
+        pa_log_error("Bluetooth backend already exists for profile %s", pa_bt_profile_to_string(p));
+        return -1;
+    }
+
+    y->profiles[p].backend = b;
+    y->profiles[p].backend_private = bp;
+
+    return 0;
+}
+
+void pa_bt_backend_unregister(pa_bluetooth_discovery *y, pa_bluetooth_backend *b, enum profile p) {
+    pa_assert(y);
+    pa_assert(b);
+
+    if (y->profiles[p].backend != b)
+        return;
+
+    y->profiles[p].backend = NULL;
+    y->profiles[p].backend_private = NULL;
+}
diff --git a/src/modules/bluetooth/bluetooth-util.h b/src/modules/bluetooth/bluetooth-util.h
index 3361b0f..969f489 100644
--- a/src/modules/bluetooth/bluetooth-util.h
+++ b/src/modules/bluetooth/bluetooth-util.h
@@ -175,4 +175,16 @@ char *pa_bluetooth_cleanup_name(const char *name);
 bool pa_bluetooth_uuid_has(pa_bluetooth_uuid *uuids, const char *uuid);
 const char *pa_bt_profile_to_string(enum profile profile);
 
+/*
+ * Backend registration mechanism
+ */
+struct pa_bluetooth_backend;
+typedef struct pa_bluetooth_backend pa_bluetooth_backend;
+
+struct pa_bluetooth_backend {
+};
+
+int pa_bt_backend_register(pa_bluetooth_discovery *y, pa_bluetooth_backend *b, enum profile p, void *bp);
+void pa_bt_backend_unregister(pa_bluetooth_discovery *y, pa_bluetooth_backend *b, enum profile p);
+
 #endif
-- 
1.8.1.4