From 825677bfb54bda8aa31d6daafe1d3dd81654de4d Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jeremy@system76.com>
Date: Sat, 4 Apr 2020 19:36:01 -0600
Subject: [PATCH] Turn off VDD3 when CPU is off and AC is not connected

---
 src/board/system76/lemp9/gpio.c               |  1 +
 src/board/system76/lemp9/include/board/gpio.h |  1 +
 src/board/system76/lemp9/power.c              | 18 ++++++++++++++----
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/src/board/system76/lemp9/gpio.c b/src/board/system76/lemp9/gpio.c
index 2e662d4..eae6c1a 100644
--- a/src/board/system76/lemp9/gpio.c
+++ b/src/board/system76/lemp9/gpio.c
@@ -35,6 +35,7 @@ struct Gpio __code VA_EC_EN =       GPIO(J, 4);
 struct Gpio __code VR_ON =          GPIO(H, 4);
 struct Gpio __code WLAN_EN =        GPIO(G, 1);
 struct Gpio __code WLAN_PWR_EN =    GPIO(A, 3);
+struct Gpio __code XLP_OUT =        GPIO(B, 4);
 
 void gpio_init() {
     // Enable LPC reset on GPD2
diff --git a/src/board/system76/lemp9/include/board/gpio.h b/src/board/system76/lemp9/include/board/gpio.h
index 380df8b..34e38d7 100644
--- a/src/board/system76/lemp9/include/board/gpio.h
+++ b/src/board/system76/lemp9/include/board/gpio.h
@@ -46,5 +46,6 @@ extern struct Gpio __code VA_EC_EN;
 extern struct Gpio __code VR_ON;
 extern struct Gpio __code WLAN_EN;
 extern struct Gpio __code WLAN_PWR_EN;
+extern struct Gpio __code XLP_OUT;
 
 #endif // _BOARD_GPIO_H
diff --git a/src/board/system76/lemp9/power.c b/src/board/system76/lemp9/power.c
index 0440459..c4393e7 100644
--- a/src/board/system76/lemp9/power.c
+++ b/src/board/system76/lemp9/power.c
@@ -399,14 +399,14 @@ void power_event(void) {
         }
     }
 
+    static uint32_t last_time = 0;
+    uint32_t time = time_get();
     if (power_state == POWER_STATE_S0) {
         // CPU on, green light
         gpio_set(&LED_PWR, true);
         gpio_set(&LED_ACIN, false);
     } else if (power_state == POWER_STATE_S3 || power_state == POWER_STATE_DS3) {
         // Suspended, flashing green light
-        static uint32_t last_time = 0;
-        uint32_t time = time_get();
         if (
             (time < last_time) // overflow
             ||
@@ -421,9 +421,19 @@ void power_event(void) {
         gpio_set(&LED_PWR, false);
         gpio_set(&LED_ACIN, true);
     } else {
-        // CPU off and AC adapter unplugged, no light
+        // CPU off and AC adapter unplugged, flashing orange light
         gpio_set(&LED_PWR, false);
-        gpio_set(&LED_ACIN, false);
+        if (
+            (time < last_time) // overflow
+            ||
+            (time >= (last_time + 1000)) // timeout
+        ) {
+            gpio_set(&LED_ACIN, !gpio_get(&LED_ACIN));
+            last_time = time;
+        }
+
+        // Attempt to kill VDD3
+        gpio_set(&XLP_OUT, false);
     }
 #endif // DEEP_SX
 }