From c9824094c6c8a91961889c913360938cae72efbb Mon Sep 17 00:00:00 2001
From: zvecr <git@zvecr.com>
Date: Thu, 5 Jun 2025 05:11:18 +0100
Subject: [PATCH 1/2] Partially implement connection update logic

---
 quantum/keyboard.c       |  4 ++++
 tmk_core/protocol/host.c | 31 +++++++++++++++++++++++++++++--
 tmk_core/protocol/host.h |  3 +++
 3 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/quantum/keyboard.c b/quantum/keyboard.c
index c1a6d444a5a..4605e7434cd 100644
--- a/quantum/keyboard.c
+++ b/quantum/keyboard.c
@@ -29,6 +29,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "debug.h"
 #include "command.h"
 #include "util.h"
+#include "host.h"
 #include "sendchar.h"
 #include "eeconfig.h"
 #include "action_layer.h"
@@ -471,6 +472,7 @@ void keyboard_init(void) {
 #ifdef CONNECTION_ENABLE
     connection_init();
 #endif
+    host_init();
     led_init_ports();
 #ifdef BACKLIGHT_ENABLE
     backlight_init_ports();
@@ -715,6 +717,8 @@ void quantum_task(void) {
 #ifdef LAYER_LOCK_ENABLE
     layer_lock_task();
 #endif
+
+    host_task();
 }
 
 /** \brief Main task that is repeatedly called as fast as possible. */
diff --git a/tmk_core/protocol/host.c b/tmk_core/protocol/host.c
index 4874d7c1d36..166bcbabea6 100644
--- a/tmk_core/protocol/host.c
+++ b/tmk_core/protocol/host.c
@@ -18,6 +18,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <stdint.h>
 #include "keyboard.h"
 #include "keycode.h"
+#include "action.h"
 #include "host.h"
 #include "util.h"
 #include "debug.h"
@@ -78,9 +79,35 @@ host_driver_t *host_get_driver(void) {
     return driver;
 }
 
+#ifdef CONNECTION_ENABLE
+static connection_host_t active_host = CONNECTION_HOST_NONE;
+
+static void host_update_active_driver(connection_host_t current, connection_host_t next) {
+    if (current != CONNECTION_HOST_NONE) {
+        // TODO: Additionally have host_driver_t handle swap
+        clear_keyboard();
+    }
+}
+#endif
+
+void host_init(void) {
+    // currently do nothing
+}
+
+void host_task(void) {
+#ifdef CONNECTION_ENABLE
+    connection_host_t next_host = connection_get_host();
+    if (next_host != active_host) {
+        host_update_active_driver(active_host, next_host);
+
+        active_host = next_host;
+    }
+#endif
+}
+
 static host_driver_t *host_get_active_driver(void) {
 #ifdef CONNECTION_ENABLE
-    switch (connection_get_host()) {
+    switch (active_host) {
 #    ifdef BLUETOOTH_ENABLE
         case CONNECTION_HOST_BLUETOOTH:
             return &bt_driver;
@@ -96,7 +123,7 @@ static host_driver_t *host_get_active_driver(void) {
 
 bool host_can_send_nkro(void) {
 #ifdef CONNECTION_ENABLE
-    switch (connection_get_host()) {
+    switch (active_host) {
 #    ifdef BLUETOOTH_ENABLE
         case CONNECTION_HOST_BLUETOOTH:
             return bluetooth_can_send_nkro();
diff --git a/tmk_core/protocol/host.h b/tmk_core/protocol/host.h
index a0b1e73dccc..7ff6d0df08d 100644
--- a/tmk_core/protocol/host.h
+++ b/tmk_core/protocol/host.h
@@ -27,6 +27,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 extern "C" {
 #endif
 
+void host_init(void);
+void host_task(void);
+
 /* host driver */
 void           host_set_driver(host_driver_t *driver);
 host_driver_t *host_get_driver(void);

From 6dd03f42882b8de1483db79e30bf937bff781c49 Mon Sep 17 00:00:00 2001
From: zvecr <git@zvecr.com>
Date: Fri, 6 Jun 2025 02:42:57 +0100
Subject: [PATCH 2/2] Add active driver callbacks

---
 tmk_core/protocol/host.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/tmk_core/protocol/host.c b/tmk_core/protocol/host.c
index 166bcbabea6..f4fa9064e03 100644
--- a/tmk_core/protocol/host.c
+++ b/tmk_core/protocol/host.c
@@ -82,12 +82,25 @@ host_driver_t *host_get_driver(void) {
 #ifdef CONNECTION_ENABLE
 static connection_host_t active_host = CONNECTION_HOST_NONE;
 
+__attribute__((weak)) void host_disconnect_active_driver_user(connection_host_t host) {}
+__attribute__((weak)) void host_disconnect_active_driver_kb(connection_host_t host) {}
+
+__attribute__((weak)) void host_connect_active_driver_user(connection_host_t host) {}
+__attribute__((weak)) void host_connect_active_driver_kb(connection_host_t host) {}
+
+// TODO: Additionally have host_driver_t handle swap
 static void host_update_active_driver(connection_host_t current, connection_host_t next) {
+    host_disconnect_active_driver_user(current);
+    host_disconnect_active_driver_kb(current);
+
     if (current != CONNECTION_HOST_NONE) {
-        // TODO: Additionally have host_driver_t handle swap
         clear_keyboard();
     }
+
+    host_connect_active_driver_user(next);
+    host_connect_active_driver_kb(next);
 }
+
 #endif
 
 void host_init(void) {