1 files changed, 151 insertions, 0 deletions

diff --git a/firmware/target/arm/s3c2440/mini2440/backlight-mini2440.c b/firmware/target/arm/s3c2440/mini2440/backlight-mini2440.c
new file mode 100644
index 0000000000..88c0b5ce2c
--- /dev/null
+++ b/firmware/target/arm/s3c2440/mini2440/backlight-mini2440.c
@@ -0,0 +1,151 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 by Bob Cousins
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+#include "system.h"
+#include "backlight-target.h"
+#include "backlight.h"
+#include "lcd.h"
+#include "power.h"
+
+
+/* Dummy value at index 0, 1-12 used. */
+static const unsigned char log_brightness[13] =
+    {0,0,1,2,3,5,7,10,15,22,31,44,63};
+
+
+static enum backlight_states
+{
+    BACKLIGHT_CONTROL_IDLE,
+    BACKLIGHT_CONTROL_OFF,
+    BACKLIGHT_CONTROL_ON,
+    BACKLIGHT_CONTROL_SET,
+    BACKLIGHT_CONTROL_FADE
+} backlight_control;
+
+static unsigned char _backlight_brightness;
+static unsigned char backlight_target;
+
+
+/* Assumes that the backlight has been initialized */
+void _backlight_set_brightness(int brightness)
+{
+    /* stop the interrupt from messing us up */
+    backlight_control = BACKLIGHT_CONTROL_IDLE;
+    _backlight_brightness = log_brightness[brightness];
+    backlight_control = BACKLIGHT_CONTROL_SET;
+}
+
+void _backlight_set_state (unsigned int level)
+{
+    if (level == 0)
+       GPGDAT &= ~GPIO_LCD_PWR;
+    else
+       GPGDAT |= GPIO_LCD_PWR;
+}
+
+/* led_control_service runs in interrupt context - be brief!
+ * This service is called once per interrupt timer tick - 100 times a second.
+ *
+ * There should be at most only one i2c operation per call - if more are need
+ *  the calls should be spread across calls.
+ *
+ * Putting all led servicing in one thread means that we wont step on any
+ * i2c operations - they are all serialized here in the ISR tick. It also
+ * insures that we get called at equal timing for good visual effect.
+ */
+#ifndef BOOTLOADER
+static void led_control_service(void)
+{
+    switch (backlight_control)
+    {
+        case BACKLIGHT_CONTROL_IDLE:
+            backlight_control = BACKLIGHT_CONTROL_IDLE;
+            break;
+        case BACKLIGHT_CONTROL_OFF:
+            _backlight_set_brightness(0);
+            backlight_control = BACKLIGHT_CONTROL_IDLE;
+            break;
+        case BACKLIGHT_CONTROL_ON:
+            _backlight_set_brightness(255);
+            backlight_control = BACKLIGHT_CONTROL_IDLE;
+            break;
+        case BACKLIGHT_CONTROL_SET:
+            _backlight_set_brightness(255);
+            backlight_control = BACKLIGHT_CONTROL_IDLE;
+            break;
+        case BACKLIGHT_CONTROL_FADE:
+            _backlight_set_brightness(0);
+            backlight_control = BACKLIGHT_CONTROL_IDLE;
+            break;
+        default:
+            backlight_control = BACKLIGHT_CONTROL_IDLE;
+            break;
+    }
+}
+#endif /* BOOTLOADER */
+
+static void __backlight_dim(bool dim_now)
+{
+    /* dont let the interrupt tick happen */
+    backlight_control = BACKLIGHT_CONTROL_IDLE;
+    backlight_target = dim_now ? 0 : _backlight_brightness;
+    if(backlight_target==0 && _backlight_brightness==0)
+    {
+        if(dim_now == false)
+            backlight_control = BACKLIGHT_CONTROL_ON;
+        else
+            backlight_control = BACKLIGHT_CONTROL_OFF;
+    }
+    else
+        backlight_control = BACKLIGHT_CONTROL_FADE;
+}
+
+void _backlight_on(void)
+{
+#ifdef HAVE_LCD_ENABLE
+    lcd_enable(true); /* power on lcd + visible display */
+#endif
+    __backlight_dim(false);
+}
+
+void _backlight_off(void)
+{
+    __backlight_dim(true);
+}
+
+
+bool _backlight_init(void)
+{
+    unsigned char brightness = log_brightness[DEFAULT_BRIGHTNESS_SETTING];
+    _backlight_brightness = brightness;
+
+    backlight_control = BACKLIGHT_CONTROL_ON;
+
+    _backlight_set_state (1);
+    S3C2440_GPIO_CONFIG (GPGCON, 4, GPIO_OUTPUT);    
+    
+#ifndef BOOTLOADER
+    /* put the led control on the tick list */
+    tick_add_task(led_control_service);
+#endif
+    return true;
+}