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diff --git a/keyboards/handwired/co60/rev6/led.c b/keyboards/handwired/co60/rev6/led.c
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+/*
+Copyright 2012 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 "hal.h"
+#include "led_custom.h"
+#include "rev6.h"
+#include "printf.h"
+
+static void breathing_callback(PWMDriver *pwmp);
+
+static PWMConfig pwmCFG = {
+ 0xFFFF, /* PWM clock frequency */
+ 256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
+ NULL, /* No Callback */
+ {
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* Enable Channel 3 */
+ {PWM_OUTPUT_DISABLED, NULL}
+ },
+ 0, /* HW dependent part.*/
+ 0
+};
+
+static PWMConfig pwmCFG_breathing = {
+ 0xFFFF, /* 10kHz PWM clock frequency */
+ 256, /* PWM period (in ticks) 1S (1/10kHz=0.1mS 0.1ms*10000 ticks=1S) */
+ breathing_callback, /* Breathing Callback */
+ {
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_DISABLED, NULL},
+ {PWM_OUTPUT_ACTIVE_HIGH, NULL}, /* Enable Channel 3 */
+ {PWM_OUTPUT_DISABLED, NULL}
+ },
+ 0, /* HW dependent part.*/
+ 0
+};
+
+// See http://jared.geek.nz/2013/feb/linear-led-pwm
+static uint16_t cie_lightness(uint16_t v) {
+ if (v <= 5243) // if below 8% of max
+ return v / 9; // same as dividing by 900%
+ else {
+ uint32_t y = (((uint32_t)v + 10486) << 8) / (10486 + 0xFFFFUL); // add 16% of max and compare
+ // to get a useful result with integer division, we shift left in the expression above
+ // and revert what we've done again after squaring.
+ y = y * y * y >> 8;
+ if (y > 0xFFFFUL) // prevent overflow
+ return 0xFFFFU;
+ else
+ return (uint16_t)y;
+ }
+}
+
+void backlight_init_ports(void) {
+ palSetPadMode(GPIOB, 8, PAL_MODE_ALTERNATE(2));
+ pwmStart(&PWMD4, &pwmCFG);
+ if (kb_backlight_config.enable) {
+ if (kb_backlight_config.breathing) {
+ breathing_enable();
+ } else {
+ backlight_set(kb_backlight_config.level);
+ }
+ } else {
+ backlight_set(0);
+ }
+}
+
+void backlight_set(uint8_t level) {
+ uint32_t duty = (uint32_t)(cie_lightness(0xFFFF * (uint32_t)level / BACKLIGHT_LEVELS));
+ if (level == 0) {
+ // Turn backlight off
+ // Disable channel 3 on PWM4
+ pwmDisableChannel(&PWMD4, 2);
+ } else {
+ // Turn backlight on
+ if (!is_breathing()) {
+ // Enable channel 3 on PWM4
+ pwmEnableChannel(&PWMD4, 2, PWM_FRACTION_TO_WIDTH(&PWMD4, 0xFFFF, duty));
+ }
+ }
+}
+
+uint8_t backlight_tick = 0;
+
+void backlight_task(void) {
+}
+
+#define BREATHING_NO_HALT 0
+#define BREATHING_HALT_OFF 1
+#define BREATHING_HALT_ON 2
+#define BREATHING_STEPS 128
+
+static uint8_t breathing_period = BREATHING_PERIOD;
+static uint8_t breathing_halt = BREATHING_NO_HALT;
+static uint16_t breathing_counter = 0;
+
+bool is_breathing(void) {
+ return PWMD4.config == &pwmCFG_breathing;
+}
+
+#define breathing_min() do {breathing_counter = 0;} while (0)
+#define breathing_max() do {breathing_counter = breathing_period * 256 / 2;} while (0)
+
+
+void breathing_interrupt_enable(void){
+ pwmStop(&PWMD4);
+ pwmStart(&PWMD4, &pwmCFG_breathing);
+ chSysLockFromISR();
+ pwmEnablePeriodicNotification(&PWMD4);
+ pwmEnableChannelI(
+ &PWMD4,
+ 2,
+ PWM_FRACTION_TO_WIDTH(
+ &PWMD4,
+ 0xFFFF,
+ 0xFFFF
+ )
+ );
+ chSysUnlockFromISR();
+}
+
+void breathing_interrupt_disable(void){
+ pwmStop(&PWMD4);
+ pwmStart(&PWMD4, &pwmCFG);
+}
+
+void breathing_enable(void)
+{
+ breathing_counter = 0;
+ breathing_halt = BREATHING_NO_HALT;
+ breathing_interrupt_enable();
+}
+
+void breathing_pulse(void)
+{
+ if (kb_backlight_config.level == 0)
+ breathing_min();
+ else
+ breathing_max();
+ breathing_halt = BREATHING_HALT_ON;
+ breathing_interrupt_enable();
+}
+
+void breathing_disable(void)
+{
+ breathing_interrupt_disable();
+ // Restore backlight level
+ backlight_set(kb_backlight_config.level);
+}
+
+void breathing_self_disable(void)
+{
+ if (kb_backlight_config.level == 0)
+ breathing_halt = BREATHING_HALT_OFF;
+ else
+ breathing_halt = BREATHING_HALT_ON;
+}
+
+void breathing_toggle(void) {
+ if (is_breathing()){
+ breathing_disable();
+ } else {
+ breathing_enable();
+ }
+}
+
+void breathing_period_set(uint8_t value)
+{
+ if (!value)
+ value = 1;
+ breathing_period = value;
+}
+
+void breathing_period_default(void) {
+ breathing_period_set(BREATHING_PERIOD);
+}
+
+void breathing_period_inc(void)
+{
+ breathing_period_set(breathing_period+1);
+}
+
+void breathing_period_dec(void)
+{
+ breathing_period_set(breathing_period-1);
+}
+
+/* To generate breathing curve in python:
+ * from math import sin, pi; [int(sin(x/128.0*pi)**4*255) for x in range(128)]
+ */
+static const uint8_t breathing_table[BREATHING_STEPS] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 28, 32, 36, 41, 46, 51, 57, 63, 70, 76, 83, 91, 98, 106, 113, 121, 129, 138, 146, 154, 162, 170, 178, 185, 193, 200, 207, 213, 220, 225, 231, 235, 240, 244, 247, 250, 252, 253, 254, 255, 254, 253, 252, 250, 247, 244, 240, 235, 231, 225, 220, 213, 207, 200, 193, 185, 178, 170, 162, 154, 146, 138, 129, 121, 113, 106, 98, 91, 83, 76, 70, 63, 57, 51, 46, 41, 36, 32, 28, 24, 20, 17, 15, 12, 10, 8, 6, 5, 4, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+// Use this before the cie_lightness function.
+static inline uint16_t scale_backlight(uint16_t v) {
+ return v / BACKLIGHT_LEVELS * kb_backlight_config.level;
+}
+
+static void breathing_callback(PWMDriver *pwmp)
+{
+ (void)pwmp;
+ uint16_t interval = (uint16_t) breathing_period * 256 / BREATHING_STEPS;
+ // resetting after one period to prevent ugly reset at overflow.
+ breathing_counter = (breathing_counter + 1) % (breathing_period * 256);
+ uint8_t index = breathing_counter / interval % BREATHING_STEPS;
+
+ if (((breathing_halt == BREATHING_HALT_ON) && (index == BREATHING_STEPS / 2)) ||
+ ((breathing_halt == BREATHING_HALT_OFF) && (index == BREATHING_STEPS - 1)))
+ {
+ breathing_interrupt_disable();
+ }
+
+ uint32_t duty = cie_lightness(scale_backlight(breathing_table[index] * 256));
+
+ chSysLockFromISR();
+ pwmEnableChannelI(
+ &PWMD4,
+ 2,
+ PWM_FRACTION_TO_WIDTH(
+ &PWMD4,
+ 0xFFFF,
+ duty
+ )
+ );
+ chSysUnlockFromISR();
+}
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