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diff --git a/keyboards/gboards/gergoplex/matrix.c b/keyboards/gboards/gergoplex/matrix.c
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+/*
+
+Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.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 "matrix.h"
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include "wait.h"
+#include "action_layer.h"
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "debounce.h"
+#include "gergoplex.h"
+
+#ifdef BALLER
+# include <avr/interrupt.h>
+# include "pointing_device.h"
+#endif
+
+#ifndef DEBOUNCE
+# define DEBOUNCE 5
+#endif
+
+// ATmega pin defs
+#define ROW1 (1 << 6)
+#define ROW2 (1 << 5)
+#define ROW3 (1 << 4)
+#define ROW4 (1 << 1)
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+/*
+ * matrix state(1:on, 0:off)
+ * contains the raw values without debounce filtering of the last read cycle.
+ */
+static matrix_row_t raw_matrix[MATRIX_ROWS];
+
+static const pin_t row_pins[MATRIX_COLS] = MATRIX_ROW_PINS;
+// Right-hand side only pins, the left side is controlled my MCP
+static const pin_t col_pins[MATRIX_ROWS_PER_SIDE] = MATRIX_COL_PINS;
+
+// Debouncing: store for each key the number of scans until it's eligible to
+// change. When scanning the matrix, ignore any changes in keys that have
+// already changed in the last DEBOUNCE scans.
+
+static matrix_row_t read_cols(uint8_t row);
+static void init_cols(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+
+static uint8_t mcp23018_reset_loop;
+
+__attribute__((weak)) void matrix_init_user(void) {}
+__attribute__((weak)) void matrix_scan_user(void) {}
+__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
+
+void matrix_init(void) {
+ // initialize row and col
+ mcp23018_status = init_mcp23018();
+ unselect_rows();
+ init_cols();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ matrix[i] = 0;
+ raw_matrix[i] = 0;
+ }
+
+ debounce_init(MATRIX_ROWS);
+ matrix_init_quantum();
+}
+void matrix_power_up(void) {
+ mcp23018_status = init_mcp23018();
+
+ unselect_rows();
+ init_cols();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ matrix[i] = 0;
+ }
+}
+
+// Reads and stores a row, returning
+// whether a change occurred.
+static inline bool store_raw_matrix_row(uint8_t index) {
+ matrix_row_t temp = read_cols(index);
+ if (raw_matrix[index] != temp) {
+ raw_matrix[index] = temp;
+ return true;
+ }
+ return false;
+}
+uint8_t matrix_scan(void) {
+ if (mcp23018_status) { // if there was an error
+ if (++mcp23018_reset_loop == 0) {
+ // if (++mcp23018_reset_loop >= 1300) {
+ // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
+ // this will be approx bit more frequent than once per second
+ print("trying to reset mcp23018\n");
+ mcp23018_status = init_mcp23018();
+ if (mcp23018_status) {
+ print("left side not responding\n");
+ } else {
+ print("left side attached\n");
+ }
+ }
+ }
+
+ bool changed = false;
+ for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
+ // select rows from left and right hands
+ uint8_t left_index = i;
+ uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
+ select_row(left_index);
+ select_row(right_index);
+
+ // we don't need a 30us delay anymore, because selecting a
+ // left-hand row requires more than 30us for i2c.
+
+ changed |= store_raw_matrix_row(left_index);
+ changed |= store_raw_matrix_row(right_index);
+
+ unselect_rows();
+ }
+
+ debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
+ matrix_scan_quantum();
+
+#ifdef DEBUG_MATRIX
+ for (uint8_t c = 0; c < MATRIX_COLS; c++)
+ for (uint8_t r = 0; r < MATRIX_ROWS; r++)
+ if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
+#endif
+
+ return 1;
+}
+
+bool matrix_is_modified(void) // deprecated and evidently not called.
+{
+ return true;
+}
+
+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]; }
+
+void matrix_print(void) {
+ print("\nr/c 0123456789ABCDEF\n");
+ for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+ print_hex8(row);
+ print(": ");
+ print_bin_reverse16(matrix_get_row(row));
+ print("\n");
+ }
+}
+uint8_t matrix_key_count(void) {
+ uint8_t count = 0;
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ count += bitpop16(matrix[i]);
+ }
+ return count;
+}
+
+// Remember this means ROWS
+static void init_cols(void) {
+ for (uint8_t row = 0; row < MATRIX_COLS; row++) {
+ setPinInputHigh(row_pins[row]);
+ }
+}
+
+static matrix_row_t read_cols(uint8_t row) {
+ if (row < 5) {
+ if (mcp23018_status) { // if there was an error
+ return 0;
+ } else {
+ uint8_t data = 0;
+ mcp23018_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
+ if (mcp23018_status) goto out;
+ mcp23018_status = i2c_read_nack(I2C_TIMEOUT);
+ if (mcp23018_status < 0) goto out;
+ data = ~((uint8_t)mcp23018_status);
+ mcp23018_status = I2C_STATUS_SUCCESS;
+ out:
+ i2c_stop();
+
+#ifdef DEBUG_MATRIX
+ if (data != 0x00) xprintf("I2C: %d\n", data);
+#endif
+ return data;
+ }
+ } else {
+ return ~((((PINF & ROW4) >> 1) | ((PINF & (ROW1 | ROW2 | ROW3)) >> 3)) & 0xF);
+ }
+}
+
+// Row pin configuration
+static void unselect_rows(void) {
+ // no need to unselect on mcp23018, because the select step sets all
+ // the other row bits high, and it's not changing to a different direction
+
+ for (uint8_t col = 0; col < MATRIX_ROWS_PER_SIDE; col++) {
+ setPinInput(col_pins[col]);
+ writePinLow(col_pins[col]);
+ }
+}
+
+static void select_row(uint8_t row) {
+ if (row < 5) {
+ // select on mcp23018
+ if (mcp23018_status) { // do nothing on error
+ } else { // set active row low : 0 // set other rows hi-Z : 1
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
+ if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(GPIOA, I2C_TIMEOUT);
+ if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0xFF & ~(1 << (row + 1)), I2C_TIMEOUT);
+ if (mcp23018_status) goto out;
+ out:
+ i2c_stop();
+ }
+ } else {
+ setPinOutput(col_pins[row - MATRIX_ROWS_PER_SIDE]);
+ writePinLow(col_pins[row - MATRIX_ROWS_PER_SIDE]);
+ }
+}