Reset EC config on Fn+Esc during power on

src/board/system76/common/config.c

@@ -3,8 +3,16 @@
 #include <board/config.h>
 
 #include <board/battery.h>
+#include <board/kbscan.h>
 #include <common/debug.h>
 
+/**
+ * Test if the EC should reset its configuration.
+ */
+bool config_should_reset(void) {
+    return kbscan_fn_held && kbscan_esc_held;
+}
+
 /**
  * Reset the EC configuration data.
  */

src/board/system76/common/include/board/config.h

@@ -3,6 +3,9 @@
 #ifndef _BOARD_CONFIG_H
 #define _BOARD_CONFIG_H
 
+#include <stdbool.h>
+
+bool config_should_reset(void);
 void config_reset(void);
 
 #endif // _BOARD_CONFIG_H

src/board/system76/common/include/board/kbscan.h

@@ -7,6 +7,10 @@
 
 #include <ec/kbscan.h>
 
+// EC config reset key combo: Fn+Esc
+extern bool kbscan_fn_held;
+extern bool kbscan_esc_held;
+
 extern bool kbscan_enabled;
 
 // ms between repeating key

src/board/system76/common/kbscan.c

@@ -18,6 +18,9 @@
 #define KM_NKEY 0
 #endif // KM_NKEY
 
+bool kbscan_fn_held = false;
+bool kbscan_esc_held = false;
+
 bool kbscan_enabled = false;
 uint16_t kbscan_repeat_period = 91;
 uint16_t kbscan_repeat_delay = 500;
@@ -182,12 +185,16 @@ bool kbscan_press(uint16_t key, bool pressed, uint8_t * layer) {
         case (KT_NORMAL):
             if (kbscan_enabled) {
                 kbc_scancode(&KBC, key, pressed);
+                if ((key & 0xFF) == K_ESC)
+                    kbscan_esc_held = pressed;
             }
             break;
         case (KT_FN):
             if (layer != NULL) {
                 if (pressed) *layer = 1;
                 else *layer = 0;
+
+                kbscan_fn_held = pressed;
             } else {
                 // In the case no layer can be set, reset bit
                 return false;

src/board/system76/common/power.c

@@ -5,6 +5,7 @@
 #include <board/acpi.h>
 #include <board/battery.h>
 #include <board/board.h>
+#include <board/config.h>
 #include <board/gpio.h>
 #include <board/kbled.h>
 #include <board/lid.h>
@@ -405,6 +406,8 @@ void power_event(void) {
             // Enable S5 power if necessary, before sending PWR_BTN
             update_power_state();
             if (power_state == POWER_STATE_DS5) {
+                if (config_should_reset())
+                    config_reset();
                 power_on_s5();
             }
         }