From 608ebe2686bdb3fdbd0426731cabdf6082c57b53 Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Sun, 23 Nov 2014 13:08:05 +0900
Subject: Matrix power saving

---
 keyboard/hhkb_rn42/hhkb_avr.h  |  5 ++---
 keyboard/hhkb_rn42/matrix.c    | 28 ++++++++++++++++++++++++++--
 keyboard/hhkb_rn42/rn42/main.c |  2 +-
 3 files changed, 29 insertions(+), 6 deletions(-)

(limited to 'keyboard/hhkb_rn42')

diff --git a/keyboard/hhkb_rn42/hhkb_avr.h b/keyboard/hhkb_rn42/hhkb_avr.h
index 313effedfe..f007d7667a 100644
--- a/keyboard/hhkb_rn42/hhkb_avr.h
+++ b/keyboard/hhkb_rn42/hhkb_avr.h
@@ -43,11 +43,10 @@ static inline void KEY_PREV_ON(void) { (PORTB |=  (1<<7)); }
 static inline void KEY_PREV_OFF(void) { (PORTB &= ~(1<<7)); }
 #ifdef HHKB_POWER_SAVING
 static inline void KEY_POWER_ON(void) {
-    _delay_ms(10);                      // TODO: sleep to save power
     DDRB = 0xFF; PORTB = 0x40;          // change pins output
     DDRD |= (1<<4); PORTD |= (1<<4);    // MOS FET switch on
     /* Without this wait you will miss or get false key events. */
-    _delay_ms(1);                       // wait for powering up
+    _delay_ms(5);                       // wait for powering up
 }
 static inline void KEY_POWER_OFF(void) {
     /* input with pull-up consumes less than without it when pin is open. */
@@ -74,7 +73,7 @@ static inline void KEY_INIT(void)
     KEY_UNABLE();
     KEY_PREV_OFF();
 
-    KEY_POWER_OFF();
+    KEY_POWER_ON();
 }
 static inline void KEY_SELECT(uint8_t ROW, uint8_t COL)
 {
diff --git a/keyboard/hhkb_rn42/matrix.c b/keyboard/hhkb_rn42/matrix.c
index b0af4baa52..c6c444ff52 100644
--- a/keyboard/hhkb_rn42/matrix.c
+++ b/keyboard/hhkb_rn42/matrix.c
@@ -27,8 +27,16 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "timer.h"
 #include "matrix.h"
 #include "hhkb_avr.h"
+#include <avr/wdt.h>
+#include "suspend.h"
+#include "lufa.h"
 
 
+// matrix power saving
+#define MATRIX_POWER_SAVE       10000
+static uint32_t matrix_last_modified = 0;
+static bool matrix_power = true;
+
 // matrix state buffer(1:on, 0:off)
 static matrix_row_t *matrix;
 static matrix_row_t *matrix_prev;
@@ -72,7 +80,7 @@ uint8_t matrix_scan(void)
     matrix_prev = matrix;
     matrix = tmp;
 
-    KEY_POWER_ON();
+    matrix_power_up();
     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
         for (uint8_t col = 0; col < MATRIX_COLS; col++) {
             KEY_SELECT(row, col);
@@ -126,8 +134,9 @@ uint8_t matrix_scan(void)
             // This takes 25us or more to make sure KEY_STATE returns to idle state.
             _delay_us(75);
         }
+        if (matrix[row] ^ matrix_prev[row]) matrix_last_modified = timer_read32();
     }
-    KEY_POWER_OFF();
+    matrix_power_down();
     return 1;
 }
 
@@ -165,3 +174,18 @@ void matrix_print(void)
         xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
     }
 }
+
+void matrix_power_up(void) {
+    if (matrix_power) return;
+    KEY_POWER_ON();
+    matrix_power = true;
+}
+void matrix_power_down(void) {
+    if (!matrix_power) return;
+    // doesn't power save while USB connection is active
+    if (USB_DeviceState == DEVICE_STATE_Configured) return;
+    if (timer_elapsed32(matrix_last_modified) <= MATRIX_POWER_SAVE) return;
+    KEY_POWER_OFF();
+    suspend_power_down(WDTO_15MS);
+    matrix_power = false;
+}
diff --git a/keyboard/hhkb_rn42/rn42/main.c b/keyboard/hhkb_rn42/rn42/main.c
index a3a37c0747..43d887067d 100644
--- a/keyboard/hhkb_rn42/rn42/main.c
+++ b/keyboard/hhkb_rn42/rn42/main.c
@@ -85,7 +85,7 @@ 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();
             }
-- 
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