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diff --git a/keyboards/fc660c/actuation_point.c b/keyboards/fc660c/actuation_point.c
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+/*
+Copyright 2017 Balz Guenat
+based on work by Jun Wako <wakojun@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 "actuation_point.h"
+#include "i2c.h"
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// AD5258 I2C digital potentiometer
+// http://www.analog.com/media/en/technical-documentation/data-sheets/AD5258.pdf
+//
+#define AD5258_ADDR 0b0011000
+#define AD5258_INST_RDAC 0x00
+#define AD5258_INST_EEPROM 0x20
+
+uint8_t read_rdac(void) {
+ // read RDAC register
+ i2c_start_write(AD5258_ADDR);
+ i2c_master_write(AD5258_INST_RDAC);
+ i2c_start_read(AD5258_ADDR);
+ uint8_t ret = i2c_master_read(I2C_NACK);
+ i2c_master_stop();
+ return ret;
+};
+
+uint8_t read_eeprom(void) {
+ i2c_start_write(AD5258_ADDR);
+ i2c_master_write(AD5258_INST_EEPROM);
+ i2c_start_read(AD5258_ADDR);
+ uint8_t ret = i2c_master_read(I2C_NACK);
+ i2c_master_stop();
+ return ret;
+};
+
+void write_rdac(uint8_t rdac) {
+ // write RDAC register:
+ i2c_start_write(AD5258_ADDR);
+ i2c_master_write(AD5258_INST_RDAC);
+ i2c_master_write(rdac & 0x3F);
+ i2c_master_stop();
+};
+
+void actuation_point_up(void) {
+ // write RDAC register: lower value makes actuation point shallow
+ uint8_t rdac = read_rdac();
+ if (rdac == 0)
+ write_rdac(0);
+ else
+ write_rdac(rdac-1);
+};
+
+void actuation_point_down(void) {
+ // write RDAC register: higher value makes actuation point deep
+ uint8_t rdac = read_rdac();
+ if (rdac == 63)
+ write_rdac(63);
+ else
+ write_rdac(rdac+1);
+};
+
+void adjust_actuation_point(int offset) {
+ i2c_master_init();
+ uint8_t rdac = read_eeprom() + offset;
+ if (rdac > 63) { // protects from under and overflows
+ if (offset > 0)
+ write_rdac(63);
+ else
+ write_rdac(0);
+ } else {
+ write_rdac(rdac);
+ }
+}