From 03e63da3165fa2ea02286a4497d2e9cf0bdc6ea6 Mon Sep 17 00:00:00 2001
From: Sebastian Leonhardt <sebastian.leonhardt@web.de>
Date: Sat, 25 Jun 2016 15:25:30 +0200
Subject: YH820: implement LCD sleep

use sleep setting to keep transflective LCD active without backlight

Change-Id: Iccd97e956d5e4a2a22abc90d15e9123782126ecb
---
 firmware/export/backlight.h                        |  4 +++
 firmware/export/config/samsungyh820.h              | 15 +++++---
 .../target/arm/samsung/yh820/backlight-yh820.c     |  5 +--
 firmware/target/arm/samsung/yh820/lcd-yh820.c      | 41 ++++++++++++++++++++++
 4 files changed, 57 insertions(+), 8 deletions(-)

diff --git a/firmware/export/backlight.h b/firmware/export/backlight.h
index a1c65a3b4e..6d029790b3 100644
--- a/firmware/export/backlight.h
+++ b/firmware/export/backlight.h
@@ -60,6 +60,10 @@ void backlight_set_on_button_hold(int index);
 void lcd_set_sleep_after_backlight_off(int timeout_seconds);
 #endif
 
+#ifdef HAVE_LCD_SLEEP
+void lcd_awake(void);
+#endif
+
 #else /* !HAVE_BACKLIGHT */
 #define backlight_init()
 #endif /* !HAVE_BACKLIGHT */
diff --git a/firmware/export/config/samsungyh820.h b/firmware/export/config/samsungyh820.h
index 52ed821370..d937a3ff6c 100644
--- a/firmware/export/config/samsungyh820.h
+++ b/firmware/export/config/samsungyh820.h
@@ -34,6 +34,9 @@
 #define LCD_DEPTH  16   /* 65536 colours */
 #define LCD_PIXELFORMAT RGB565
 
+/* LCD stays visible without backlight - simulator hint */
+#define HAVE_TRANSFLECTIVE_LCD
+
 #ifndef BOOTLOADER
 
 /* define this if you have a real-time clock */
@@ -42,12 +45,16 @@
 //#define HAVE_RTC_ALARM
 
 /* Define this if your LCD can be enabled/disabled */
-#define HAVE_LCD_ENABLE
+/* #define HAVE_LCD_ENABLE */
 
 /* Define this if your LCD can be put to sleep.
-   HAVE_LCD_ENABLE should be defined as well. */
-/* todo #define HAVE_LCD_SLEEP*/
-/* todo #define HAVE_LCD_SLEEP_SETTING */
+   HAVE_LCD_ENABLE should be defined as well.
+   Note: with a transflective display, HAVE_LCD_ENABLE shouldn't be defined.
+   LCD gets disabled when setting to sleep. */
+#define HAVE_LCD_SLEEP
+#define HAVE_LCD_SLEEP_SETTING
+/* The same code may also be used when shutting down */
+#define HAVE_LCD_SHUTDOWN
 #endif /* !BOOTLOADER */
 
 /* Define this for LCD backlight available */
diff --git a/firmware/target/arm/samsung/yh820/backlight-yh820.c b/firmware/target/arm/samsung/yh820/backlight-yh820.c
index b24f8128c4..c9309eebbe 100644
--- a/firmware/target/arm/samsung/yh820/backlight-yh820.c
+++ b/firmware/target/arm/samsung/yh820/backlight-yh820.c
@@ -28,7 +28,7 @@
 void backlight_hw_on(void)
 {
 #ifdef HAVE_LCD_SLEEP
-    backlight_lcd_sleep_countdown(false); /* stop counter */
+    lcd_awake(); /* power on lcd + visible display */
 #endif
 #ifdef HAVE_LCD_ENABLE
     lcd_enable(true); /* power on lcd + visible display */
@@ -42,7 +42,4 @@ void backlight_hw_off(void)
 #ifdef HAVE_LCD_ENABLE
     lcd_enable(false); /* power off visible display */
 #endif
-#ifdef HAVE_LCD_SLEEP
-    backlight_lcd_sleep_countdown(true); /* start countdown */
-#endif
 }
diff --git a/firmware/target/arm/samsung/yh820/lcd-yh820.c b/firmware/target/arm/samsung/yh820/lcd-yh820.c
index d6bb2a196b..f4b55ab917 100644
--- a/firmware/target/arm/samsung/yh820/lcd-yh820.c
+++ b/firmware/target/arm/samsung/yh820/lcd-yh820.c
@@ -25,6 +25,9 @@
 #include "lcd.h"
 #include "kernel.h"
 #include "system.h"
+#ifdef HAVE_LCD_SHUTDOWN
+#include "backlight-target.h"  /* included for backlight_hw_off() prototype */
+#endif
 
 /* Display status */
 static unsigned lcd_yuv_options SHAREDBSS_ATTR = 0;
@@ -235,6 +238,28 @@ void lcd_enable(bool yesno)
 }
 #endif
 
+#ifdef HAVE_LCD_SLEEP
+void lcd_sleep(void)
+{
+    if (is_lcd_enabled)
+    {
+        is_lcd_enabled = false;
+        lcd_send_command(R_STANDBY_ON);
+    }
+}
+
+void lcd_awake(void)
+{
+    if (!is_lcd_enabled)
+    {
+        is_lcd_enabled = true;
+        lcd_send_command(R_STANDBY_OFF);
+        lcd_send_command(R_DISPLAY_ON);
+        send_event(LCD_EVENT_ACTIVATION, NULL);
+    }
+}
+#endif
+
 #if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP)
 bool lcd_active(void)
 {
@@ -242,6 +267,17 @@ bool lcd_active(void)
 }
 #endif
 
+#if defined(HAVE_LCD_SHUTDOWN)
+void lcd_shutdown(void)
+{
+    backlight_hw_off();
+#ifndef HAVE_LCD_ENABLE
+    /* already done by backlight_hw_off() */
+    lcd_send_command(R_STANDBY_ON);
+#endif
+}
+#endif
+
 #ifdef HAVE_LCD_FLIP
 /* turn the display upside down (call lcd_update() afterwards) */
 /* Note: since the lcd is rotated, this will flip horiz instead of vert */
@@ -338,6 +374,11 @@ void lcd_update(void)
 void lcd_update_rect(int x, int y, int width, int height)
 {
     const fb_data *addr;
+
+#if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP)
+    if (!is_lcd_enabled)
+        return;
+#endif
     
     if (x + width >= LCD_WIDTH)
         width = LCD_WIDTH - x;
-- 
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