Make "detected_host_os()" available on the SLAVE side of the split keyboard (#19854)

Co-authored-by: ngs.ch <ngs.ch>
Co-authored-by: Drashna Jaelre <drashna@drashna.net>

3 files changed, 43 insertions, 0 deletions

diff --git a/quantum/split_common/transaction_id_define.h b/quantum/split_common/transaction_id_define.h
index 4932530aa3..4d4d2b9570 100644
--- a/quantum/split_common/transaction_id_define.h
+++ b/quantum/split_common/transaction_id_define.h
@@ -113,6 +113,10 @@ enum serial_transaction_id {
     SPLIT_TRANSACTION_IDS_USER,
 #endif // SPLIT_TRANSACTION_IDS_USER
 
+#if defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+    PUT_DETECTED_OS,
+#endif // defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+
     NUM_TOTAL_TRANSACTIONS
 };
 
diff --git a/quantum/split_common/transactions.c b/quantum/split_common/transactions.c
index 0ae91ba363..b3c80f1194 100644
--- a/quantum/split_common/transactions.c
+++ b/quantum/split_common/transactions.c
@@ -820,6 +820,34 @@ static void activity_handlers_slave(matrix_row_t master_matrix[], matrix_row_t s
 #endif // defined(SPLIT_ACTIVITY_ENABLE)
 
 ////////////////////////////////////////////////////
+// Detected OS
+
+#if defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+
+static bool detected_os_handlers_master(matrix_row_t master_matrix[], matrix_row_t slave_matrix[]) {
+    static uint32_t last_detected_os_update = 0;
+    os_variant_t    detected_os             = detected_host_os();
+    bool            okay                    = send_if_condition(PUT_DETECTED_OS, &last_detected_os_update, (detected_os != split_shmem->detected_os), &detected_os, sizeof(os_variant_t));
+    return okay;
+}
+
+static void detected_os_handlers_slave(matrix_row_t master_matrix[], matrix_row_t slave_matrix[]) {
+    slave_update_detected_host_os(split_shmem->detected_os);
+}
+
+#    define TRANSACTIONS_DETECTED_OS_MASTER() TRANSACTION_HANDLER_MASTER(detected_os)
+#    define TRANSACTIONS_DETECTED_OS_SLAVE() TRANSACTION_HANDLER_SLAVE_AUTOLOCK(detected_os)
+#    define TRANSACTIONS_DETECTED_OS_REGISTRATIONS [PUT_DETECTED_OS] = trans_initiator2target_initializer(detected_os),
+
+#else // defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+
+#    define TRANSACTIONS_DETECTED_OS_MASTER()
+#    define TRANSACTIONS_DETECTED_OS_SLAVE()
+#    define TRANSACTIONS_DETECTED_OS_REGISTRATIONS
+
+#endif // defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+
+////////////////////////////////////////////////////
 
 split_transaction_desc_t split_transaction_table[NUM_TOTAL_TRANSACTIONS] = {
     // Set defaults
@@ -848,6 +876,7 @@ split_transaction_desc_t split_transaction_table[NUM_TOTAL_TRANSACTIONS] = {
     TRANSACTIONS_WATCHDOG_REGISTRATIONS
     TRANSACTIONS_HAPTIC_REGISTRATIONS
     TRANSACTIONS_ACTIVITY_REGISTRATIONS
+    TRANSACTIONS_DETECTED_OS_REGISTRATIONS
 // clang-format on
 
 #if defined(SPLIT_TRANSACTION_IDS_KB) || defined(SPLIT_TRANSACTION_IDS_USER)
@@ -877,6 +906,7 @@ bool transactions_master(matrix_row_t master_matrix[], matrix_row_t slave_matrix
     TRANSACTIONS_WATCHDOG_MASTER();
     TRANSACTIONS_HAPTIC_MASTER();
     TRANSACTIONS_ACTIVITY_MASTER();
+    TRANSACTIONS_DETECTED_OS_MASTER();
     return true;
 }
 
@@ -899,6 +929,7 @@ void transactions_slave(matrix_row_t master_matrix[], matrix_row_t slave_matrix[
     TRANSACTIONS_WATCHDOG_SLAVE();
     TRANSACTIONS_HAPTIC_SLAVE();
     TRANSACTIONS_ACTIVITY_SLAVE();
+    TRANSACTIONS_DETECTED_OS_SLAVE();
 }
 
 #if defined(SPLIT_TRANSACTION_IDS_KB) || defined(SPLIT_TRANSACTION_IDS_USER)
diff --git a/quantum/split_common/transport.h b/quantum/split_common/transport.h
index 13b1e56814..6f8985cb07 100644
--- a/quantum/split_common/transport.h
+++ b/quantum/split_common/transport.h
@@ -142,6 +142,10 @@ typedef struct _rpc_sync_info_t {
 } rpc_sync_info_t;
 #endif // defined(SPLIT_TRANSACTION_IDS_KB) || defined(SPLIT_TRANSACTION_IDS_USER)
 
+#if defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+#    include "os_detection.h"
+#endif // defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+
 typedef struct _split_shared_memory_t {
 #ifdef USE_I2C
     int8_t transaction_id;
@@ -222,6 +226,10 @@ typedef struct _split_shared_memory_t {
     uint8_t         rpc_m2s_buffer[RPC_M2S_BUFFER_SIZE];
     uint8_t         rpc_s2m_buffer[RPC_S2M_BUFFER_SIZE];
 #endif // defined(SPLIT_TRANSACTION_IDS_KB) || defined(SPLIT_TRANSACTION_IDS_USER)
+
+#if defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+    os_variant_t detected_os;
+#endif // defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
 } split_shared_memory_t;
 
 extern split_shared_memory_t *const split_shmem;