Add support for driving unselected row/col. (#16278)

4 files changed, 19 insertions, 139 deletions

diff --git a/docs/config_options.md b/docs/config_options.md
index b661b55ee..15ad945b2 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -61,6 +61,8 @@ This is a C header file that is one of the first things included, and will persi
   * pins unused by the keyboard for reference
 * `#define MATRIX_HAS_GHOST`
   * define is matrix has ghost (unlikely)
+* `#define MATRIX_UNSELECT_DRIVE_HIGH`
+  * On un-select of matrix pins, rather than setting pins to input-high, sets them to output-high.
 * `#define DIODE_DIRECTION COL2ROW`
   * COL2ROW or ROW2COL - how your matrix is configured. COL2ROW means the black mark on your diode is facing to the rows, and between the switch and the rows.
 * `#define DIRECT_PINS { { F1, F0, B0, C7 }, { F4, F5, F6, F7 } }`
diff --git a/keyboards/keychron/q2/config.h b/keyboards/keychron/q2/config.h
index 8252b83df..d019bcee1 100644
--- a/keyboards/keychron/q2/config.h
+++ b/keyboards/keychron/q2/config.h
@@ -29,6 +29,8 @@
 #define MATRIX_ROW_PINS { B4, B3, A15, A14, A13 }
 #define MATRIX_COL_PINS { C14, C15, A0, A1, A2, A3, A4, A5, A6, A7, B0, B1, A8, A9, H3 }
 
+#define MATRIX_UNSELECT_DRIVE_HIGH
+
 /* DIP switch */
 #define DIP_SWITCH_MATRIX_GRID  { {4, 4} }
 
diff --git a/keyboards/keychron/q2/matrix.c b/keyboards/keychron/q2/matrix.c
deleted file mode 100644
index 1e493d33e..000000000
--- a/keyboards/keychron/q2/matrix.c
+++ /dev/null
@@ -1,139 +0,0 @@
-/* Copyright 2021 @ Keychron (https://www.keychron.com)
- *
- * 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 <string.h>
-#include "util.h"
-#include "matrix.h"
-#include "debounce.h"
-#include "quantum.h"
-
-#ifdef MATRIX_ROW_PINS
-static pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
-#endif  // MATRIX_ROW_PINS
-#ifdef MATRIX_COL_PINS
-static pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
-#endif  // MATRIX_COL_PINS
-
-#define ROWS_PER_HAND (MATRIX_ROWS)
-
-/* matrix state(1:on, 0:off) */
-extern matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
-extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
-
-static inline void setPinOutput_writeLow(pin_t pin) {
-    ATOMIC_BLOCK_FORCEON {
-        setPinOutput(pin);
-        writePinLow(pin);
-    }
-}
-
-static inline void setPinOutput_writeHigh(pin_t pin) {
-    ATOMIC_BLOCK_FORCEON {
-        setPinOutput(pin);
-        writePinHigh(pin);
-    }
-}
-
-static inline void setPinInputHigh_atomic(pin_t pin) {
-    ATOMIC_BLOCK_FORCEON { setPinInputHigh(pin); }
-}
-
-static inline uint8_t readMatrixPin(pin_t pin) {
-    if (pin != NO_PIN) {
-        return readPin(pin);
-    } else {
-        return 1;
-    }
-}
-
-static bool select_col(uint8_t col) {
-    pin_t pin = col_pins[col];
-    if (pin != NO_PIN) {
-        setPinOutput_writeLow(pin);
-        return true;
-    }
-    return false;
-}
-
-static void unselect_col(uint8_t col) {
-    pin_t pin = col_pins[col];
-    if (pin != NO_PIN) {
-        setPinOutput_writeHigh(pin);
-    }
-}
-
-static void unselect_cols(void) {
-    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
-        unselect_col(x);
-    }
-}
-
-void matrix_init_pins(void) {
-    unselect_cols();
-    for (uint8_t x = 0; x < ROWS_PER_HAND; x++) {
-        if (row_pins[x] != NO_PIN) {
-            setPinInputHigh_atomic(row_pins[x]);
-        }
-    }
-}
-
-void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
-    bool key_pressed = false;
-
-    // Select col
-    if (!select_col(current_col)) {  // select col
-        return;                      // skip NO_PIN col
-    }
-    matrix_output_select_delay();
-
-    // For each row...
-    for (uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) {
-        // Check row pin state
-        if (readMatrixPin(row_pins[row_index]) == 0) {
-            // Pin LO, set col bit
-            current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << current_col);
-            key_pressed = true;
-        } else {
-            // Pin HI, clear col bit
-            current_matrix[row_index] &= ~(MATRIX_ROW_SHIFTER << current_col);
-        }
-    }
-
-    // Unselect col
-    unselect_col(current_col);
-    matrix_output_unselect_delay(current_col, key_pressed);  // wait for all Row signals to go HIGH
-}
-
-void matrix_init_custom(void) {
-    // initialize key pins
-    matrix_init_pins();
-}
-
-bool matrix_scan_custom(matrix_row_t current_matrix[]) {
-    matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
-
-    // Set col, read rows
-    for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
-        matrix_read_rows_on_col(curr_matrix, current_col);
-    }
-
-    bool changed = memcmp(current_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
-    if (changed) memcpy(current_matrix, curr_matrix, sizeof(curr_matrix));
-
-    return (uint8_t)changed;
-}
diff --git a/quantum/matrix.c b/quantum/matrix.c
index 483d518ec..8596c2eab 100644
--- a/quantum/matrix.c
+++ b/quantum/matrix.c
@@ -82,6 +82,13 @@ static inline void setPinOutput_writeLow(pin_t pin) {
     }
 }
 
+static inline void setPinOutput_writeHigh(pin_t pin) {
+    ATOMIC_BLOCK_FORCEON {
+        setPinOutput(pin);
+        writePinHigh(pin);
+    }
+}
+
 static inline void setPinInputHigh_atomic(pin_t pin) {
     ATOMIC_BLOCK_FORCEON { setPinInputHigh(pin); }
 }
@@ -141,7 +148,11 @@ static bool select_row(uint8_t row) {
 static void unselect_row(uint8_t row) {
     pin_t pin = row_pins[row];
     if (pin != NO_PIN) {
+#            ifdef MATRIX_UNSELECT_DRIVE_HIGH
+        setPinOutput_writeHigh(pin);
+#            else
         setPinInputHigh_atomic(pin);
+#            endif
     }
 }
 
@@ -200,7 +211,11 @@ static bool select_col(uint8_t col) {
 static void unselect_col(uint8_t col) {
     pin_t pin = col_pins[col];
     if (pin != NO_PIN) {
+#            ifdef MATRIX_UNSELECT_DRIVE_HIGH
+        setPinOutput_writeHigh(pin);
+#            else
         setPinInputHigh_atomic(pin);
+#            endif
     }
 }