Migrate more custom matrix 'lite' code to core (#7863)

* Migrate more custom matrix lite code to core

* Align function names

* fix up MATRIX_MASKED

9 files changed, 58 insertions, 176 deletions

diff --git a/keyboards/xd84/custom_matrix_helper.c b/keyboards/xd84/custom_matrix_helper.c
deleted file mode 100644
index e4e2563819..0000000000
--- a/keyboards/xd84/custom_matrix_helper.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/* Copyright 2019
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <stdint.h>
-#include <stdbool.h>
-#include "wait.h"
-#include "print.h"
-#include "debug.h"
-#include "util.h"
-#include "matrix.h"
-#include "debounce.h"
-#include "quantum.h"
-
-//_____COULD BE COMMON_________________________________________________________
-/* matrix state(1:on, 0:off) */
-/*static*/ matrix_row_t raw_matrix[MATRIX_ROWS];
-/*static*/ matrix_row_t matrix[MATRIX_ROWS];
-
-__attribute__ ((weak))
-matrix_row_t matrix_get_row(uint8_t row) {
-  return matrix[row];
-}
-
-//_____CUSTOM MATRIX 'LITE'____________________________________________________
-__attribute__ ((weak))
-void custom_matrix_init(void) {
-}
-
-__attribute__ ((weak))
-bool custom_matrix_scan(matrix_row_t current_matrix[]) {
-    bool changed = true;
-    return changed;
-}
-
-__attribute__ ((weak))
-void matrix_init(void) {
-
-  custom_matrix_init();
-
-  // initialize matrix state: all keys off
-  for (uint8_t i=0; i < MATRIX_ROWS; i++) {
-    raw_matrix[i] = 0;
-    matrix[i] = 0;
-  }
-
-  debounce_init(MATRIX_ROWS);
-
-  matrix_init_quantum();
-}
-
-__attribute__ ((weak))
-uint8_t matrix_scan(void) {
-  bool changed = custom_matrix_scan(raw_matrix);
-
-  debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
-
-  matrix_scan_quantum();
-  return 1;
-}
diff --git a/keyboards/xd84/matrix.c b/keyboards/xd84/matrix.c
index a4ddbee9a0..92b8ff8546 100644
--- a/keyboards/xd84/matrix.c
+++ b/keyboards/xd84/matrix.c
@@ -82,14 +82,14 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
 //_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________
 
-void custom_matrix_init(void) {
+void matrix_init_custom(void) {
     pca9555_init(IC1);
     pca9555_init(IC2);
 
     init_pins();
 }
 
-bool custom_matrix_scan(matrix_row_t current_matrix[]) {
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
     bool changed = false;
     for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
         changed |= read_cols_on_row(current_matrix, current_row);
diff --git a/keyboards/xd84/rules.mk b/keyboards/xd84/rules.mk
index 4a460d91fa..13e1b4ba37 100644
--- a/keyboards/xd84/rules.mk
+++ b/keyboards/xd84/rules.mk
@@ -37,7 +37,7 @@ LINK_TIME_OPTIMIZATION_ENABLE = yes
 CUSTOM_MATRIX = lite
 
 VPATH += drivers/gpio
-SRC += custom_matrix_helper.c pca9555.c matrix.c
+SRC += pca9555.c matrix.c
 QUANTUM_LIB_SRC += i2c_master.c
 
 LAYOUTS = 75_ansi 75_iso
diff --git a/keyboards/xd96/custom_matrix_helper.c b/keyboards/xd96/custom_matrix_helper.c
deleted file mode 100644
index e4e2563819..0000000000
--- a/keyboards/xd96/custom_matrix_helper.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/* Copyright 2019
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <stdint.h>
-#include <stdbool.h>
-#include "wait.h"
-#include "print.h"
-#include "debug.h"
-#include "util.h"
-#include "matrix.h"
-#include "debounce.h"
-#include "quantum.h"
-
-//_____COULD BE COMMON_________________________________________________________
-/* matrix state(1:on, 0:off) */
-/*static*/ matrix_row_t raw_matrix[MATRIX_ROWS];
-/*static*/ matrix_row_t matrix[MATRIX_ROWS];
-
-__attribute__ ((weak))
-matrix_row_t matrix_get_row(uint8_t row) {
-  return matrix[row];
-}
-
-//_____CUSTOM MATRIX 'LITE'____________________________________________________
-__attribute__ ((weak))
-void custom_matrix_init(void) {
-}
-
-__attribute__ ((weak))
-bool custom_matrix_scan(matrix_row_t current_matrix[]) {
-    bool changed = true;
-    return changed;
-}
-
-__attribute__ ((weak))
-void matrix_init(void) {
-
-  custom_matrix_init();
-
-  // initialize matrix state: all keys off
-  for (uint8_t i=0; i < MATRIX_ROWS; i++) {
-    raw_matrix[i] = 0;
-    matrix[i] = 0;
-  }
-
-  debounce_init(MATRIX_ROWS);
-
-  matrix_init_quantum();
-}
-
-__attribute__ ((weak))
-uint8_t matrix_scan(void) {
-  bool changed = custom_matrix_scan(raw_matrix);
-
-  debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
-
-  matrix_scan_quantum();
-  return 1;
-}
diff --git a/keyboards/xd96/matrix.c b/keyboards/xd96/matrix.c
index e8fd850edb..8cecc79c26 100644
--- a/keyboards/xd96/matrix.c
+++ b/keyboards/xd96/matrix.c
@@ -80,14 +80,14 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
 //_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________
 
-void custom_matrix_init(void) {
+void matrix_init_custom(void) {
   pca9555_init(IC1);
   pca9555_init(IC2);
 
   init_pins();
 }
 
-bool custom_matrix_scan(matrix_row_t current_matrix[]) {
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
   bool changed = false;
   for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
     changed |= read_cols_on_row(current_matrix, current_row);
diff --git a/keyboards/xd96/rules.mk b/keyboards/xd96/rules.mk
index d5ac5df36a..9afd4eec4e 100644
--- a/keyboards/xd96/rules.mk
+++ b/keyboards/xd96/rules.mk
@@ -37,5 +37,5 @@ LINK_TIME_OPTIMIZATION_ENABLE = yes
 CUSTOM_MATRIX = lite
 
 VPATH += drivers/gpio
-SRC += custom_matrix_helper.c pca9555.c matrix.c
+SRC += pca9555.c matrix.c
 QUANTUM_LIB_SRC += i2c_master.c
diff --git a/quantum/matrix.c b/quantum/matrix.c
index 62a86fba68..1675f2477b 100644
--- a/quantum/matrix.c
+++ b/quantum/matrix.c
@@ -22,10 +22,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "debounce.h"
 #include "quantum.h"
 
-#ifdef MATRIX_MASKED
-extern const matrix_row_t matrix_mask[];
-#endif
-
 #ifdef DIRECT_PINS
 static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
 #elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
@@ -34,22 +30,8 @@ static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 #endif
 
 /* matrix state(1:on, 0:off) */
-static matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
-static matrix_row_t matrix[MATRIX_ROWS];      // debounced values
-
-// helper functions
-
-inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
-
-inline matrix_row_t matrix_get_row(uint8_t row) {
-    // Matrix mask lets you disable switches in the returned matrix data. For example, if you have a
-    // switch blocker installed and the switch is always pressed.
-#ifdef MATRIX_MASKED
-    return matrix[row] & matrix_mask[row];
-#else
-    return matrix[row];
-#endif
-}
+extern matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
+extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
 
 // matrix code
 
diff --git a/quantum/matrix_common.c b/quantum/matrix_common.c
index 22704e8ee2..a8948a264b 100644
--- a/quantum/matrix_common.c
+++ b/quantum/matrix_common.c
@@ -3,6 +3,14 @@
 #include "print.h"
 #include "debug.h"
 
+/* matrix state(1:on, 0:off) */
+matrix_row_t raw_matrix[MATRIX_ROWS];
+matrix_row_t matrix[MATRIX_ROWS];
+
+#ifdef MATRIX_MASKED
+extern const matrix_row_t matrix_mask[];
+#endif
+
 // user-defined overridable functions
 
 __attribute__((weak)) void matrix_init_kb(void) { matrix_init_user(); }
@@ -19,6 +27,18 @@ inline uint8_t matrix_rows(void) { return MATRIX_ROWS; }
 
 inline uint8_t matrix_cols(void) { return MATRIX_COLS; }
 
+inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
+
+inline matrix_row_t matrix_get_row(uint8_t row) {
+    // Matrix mask lets you disable switches in the returned matrix data. For example, if you have a
+    // switch blocker installed and the switch is always pressed.
+#ifdef MATRIX_MASKED
+    return matrix[row] & matrix_mask[row];
+#else
+    return matrix[row];
+#endif
+}
+
 // Deprecated.
 bool matrix_is_modified(void) {
     if (debounce_active()) return false;
@@ -57,3 +77,31 @@ uint8_t matrix_key_count(void) {
     }
     return count;
 }
+
+// CUSTOM MATRIX 'LITE'
+__attribute__((weak)) void matrix_init_custom(void) {}
+
+__attribute__((weak)) bool matrix_scan_custom(matrix_row_t current_matrix[]) { return true; }
+
+__attribute__((weak)) void matrix_init(void) {
+    matrix_init_custom();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        raw_matrix[i] = 0;
+        matrix[i]     = 0;
+    }
+
+    debounce_init(MATRIX_ROWS);
+
+    matrix_init_quantum();
+}
+
+__attribute__((weak)) uint8_t matrix_scan(void) {
+    bool changed = matrix_scan_custom(raw_matrix);
+
+    debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
+
+    matrix_scan_quantum();
+    return 1;
+}
diff --git a/quantum/split_common/matrix.c b/quantum/split_common/matrix.c
index 58602af859..ed1ff5acf3 100644
--- a/quantum/split_common/matrix.c
+++ b/quantum/split_common/matrix.c
@@ -41,8 +41,8 @@ static pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 #endif
 
 /* matrix state(1:on, 0:off) */
-static matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
-static matrix_row_t matrix[MATRIX_ROWS];      // debounced values
+extern matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
+extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
 
 // row offsets for each hand
 uint8_t thisHand, thatHand;
@@ -50,12 +50,6 @@ uint8_t thisHand, thatHand;
 // user-defined overridable functions
 __attribute__((weak)) void matrix_slave_scan_user(void) {}
 
-// helper functions
-
-inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
-
-inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
-
 // matrix code
 
 #ifdef DIRECT_PINS