From c2d830c07c823c48a17c214b093ec1bab989fb6a Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Thu, 20 Nov 2014 17:06:46 +0900
Subject: [PATCH] USB initialize when plug-in during battery powered

---
 common/avr/suspend.c | 49 ++++++++++++++++++++++++++++++--------------
 common/suspend.h     |  3 ++-
 protocol/lufa/lufa.c | 15 +++++++++++++-
 3 files changed, 50 insertions(+), 17 deletions(-)

diff --git a/common/avr/suspend.c b/common/avr/suspend.c
index f44a036b..66a579fd 100644
--- a/common/avr/suspend.c
+++ b/common/avr/suspend.c
@@ -7,6 +7,9 @@
 #include "backlight.h"
 #include "suspend_avr.h"
 #include "suspend.h"
+#ifdef PROTOCOL_LUFA
+#include "lufa.h"
+#endif
 
 
 #define wdt_intr_enable(value)   \
@@ -26,30 +29,45 @@ __asm__ __volatile__ (  \
 )
 
 
-void suspend_power_down(void)
+void suspend_idle(uint8_t time)
 {
-#ifdef BACKLIGHT_ENABLE
-    backlight_set(0);
-#endif
-#ifndef NO_SUSPEND_POWER_DOWN
-    // Enable watchdog to wake from MCU sleep
     cli();
-    wdt_reset();
+    set_sleep_mode(SLEEP_MODE_IDLE);
+    sleep_enable();
+    sei();
+    sleep_cpu();
+    sleep_disable();
+}
+
+/* Power down MCU with watchdog timer
+ * wdto: watchdog timer timeout defined in <avr/wdt.h>
+ *          WDTO_15MS
+ *          WDTO_30MS
+ *          WDTO_60MS
+ *          WDTO_120MS
+ *          WDTO_250MS
+ *          WDTO_500MS
+ *          WDTO_1S
+ *          WDTO_2S
+ *          WDTO_4S
+ *          WDTO_8S
+ */
+void suspend_power_down(uint8_t wdto)
+{
+#ifdef PROTOCOL_LUFA
+    if (USB_DeviceState == DEVICE_STATE_Configured) return;
+#endif
 
-    // Watchdog Interrupt and System Reset Mode
-    //wdt_enable(WDTO_1S);
-    //WDTCSR |= _BV(WDIE);
-    
     // Watchdog Interrupt Mode
-    wdt_intr_enable(WDTO_120MS);
-    
+    wdt_intr_enable(wdto);
+
     // TODO: more power saving
     // See PicoPower application note
     // - I/O port input with pullup
     // - prescale clock
     // - BOD disable
     // - Power Reduction Register PRR
-    // sleep in power down mode
+
     set_sleep_mode(SLEEP_MODE_PWR_DOWN);
     sleep_enable();
     sei();
@@ -58,12 +76,13 @@ void suspend_power_down(void)
 
     // Disable watchdog after sleep
     wdt_disable();
-#endif
 }
 
 bool suspend_wakeup_condition(void)
 {
+    matrix_power_up();
     matrix_scan();
+    matrix_power_down();
     for (uint8_t r = 0; r < MATRIX_ROWS; r++) {
         if (matrix_get_row(r)) return true;
     }
diff --git a/common/suspend.h b/common/suspend.h
index 9b76f280..f339c670 100644
--- a/common/suspend.h
+++ b/common/suspend.h
@@ -5,7 +5,8 @@
 #include <stdbool.h>
 
 
-void suspend_power_down(void);
+void suspend_idle(uint8_t timeout);
+void suspend_power_down(uint8_t timeout);
 bool suspend_wakeup_condition(void);
 void suspend_wakeup_init(void);
 
diff --git a/protocol/lufa/lufa.c b/protocol/lufa/lufa.c
index 16a602df..6802f3b6 100644
--- a/protocol/lufa/lufa.c
+++ b/protocol/lufa/lufa.c
@@ -148,10 +148,23 @@ static void Console_Task(void)
 */
 void EVENT_USB_Device_Connect(void)
 {
+    /* For battery powered device */
+    if (!USB_IsInitialized) {
+        USB_Init();
+        USB_Device_EnableSOFEvents();
+    }
 }
 
 void EVENT_USB_Device_Disconnect(void)
 {
+    /* For battery powered device */
+/* TODO: This doesn't work. After several plug in/outs can not be enumerated. 
+    if (USB_IsInitialized) {
+        USB_Disable();  // Disable all interrupts
+	USB_Controller_Enable();
+        USB_INT_Enable(USB_INT_VBUSTI);
+    }
+*/
 }
 
 void EVENT_USB_Device_Reset(void)
@@ -574,7 +587,7 @@ int main(void)
     print("Keyboard start.\n");
     while (1) {
         while (USB_DeviceState == DEVICE_STATE_Suspended) {
-            suspend_power_down();
+            suspend_power_down(WDTO_120MS);
             if (USB_Device_RemoteWakeupEnabled && suspend_wakeup_condition()) {
                     USB_Device_SendRemoteWakeup();
             }
-- 
2.46.2