Clip: add backlight and buttonlight code

Revive lcd_enable() as well, and use it in _backlight_on/off()
Don't update the lcd framebuffer if the display is off

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18952 a1c6a512-1295-4272-9138-f99709370657

firmware/target/arm/as3525/sansa-clip/backlight-clip.c

@@ -0,0 +1,58 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright © 2008 Rafaël Carré
+ *
+ * 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 "backlight-target.h"
+#include "as3525.h"
+
+/* TODO : backlight brightness */
+
+/* XXX : xpd is used for SD/MCI interface
+ * If interrupts are used to access this interface, they should be
+ * disabled in _buttonlight_on/off ()
+ */
+
+void _buttonlight_on(void)
+{
+    int saved_ccu_io;
+
+    saved_ccu_io = CCU_IO;  /* save XPD setting */
+
+    CCU_IO &= ~(3<<2);      /* setup xpd as GPIO */
+
+    GPIOD_DIR |= (1<<7);
+    GPIOD_PIN(7) = (1<<7);  /* set pin d7 high */
+
+    CCU_IO = saved_ccu_io;  /* restore the previous XPD setting */
+}
+
+void _buttonlight_off(void)
+{
+    int saved_ccu_io;
+
+    saved_ccu_io = CCU_IO;  /* save XPD setting */
+
+    CCU_IO &= ~(3<<2);      /* setup xpd as GPIO */
+
+    GPIOD_DIR |= (1<<7);
+    GPIOD_PIN(7) = 0;       /* set pin d7 low */
+
+    CCU_IO = saved_ccu_io;  /* restore the previous XPD setting */
+}

firmware/target/arm/as3525/sansa-clip/backlight-target.h

@@ -7,7 +7,7 @@
  *                     \/            \/     \/    \/            \/
  * $Id$
  *
- * Copyright (C) 2008 ??
+ * Copyright © 2008 Rafaël Carré
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -21,17 +21,23 @@
 #ifndef BACKLIGHT_TARGET_H
 #define BACKLIGHT_TARGET_H
 
-static inline bool _backlight_init(void)
-{
-    return true;
-}
+#include "stdbool.h"
+#include "lcd.h"
+#include "backlight.h"
+
+#define _backlight_init() true
 
 static inline void _backlight_on(void)
 {
+    lcd_enable(true);
 }
 
 static inline void _backlight_off(void)
 {
+    lcd_enable(false);
 }
 
+void _buttonlight_on(void);
+void _buttonlight_off(void);
+
 #endif

firmware/target/arm/as3525/sansa-clip/lcd-ssd1303.c

@@ -149,6 +149,9 @@ void lcd_set_flip(bool yesno)
 
 void lcd_enable(bool enable)
 {
+    if(display_on == enable)
+        return;
+
     if( (display_on = enable) ) /* simple '=' is not a typo ! */
         lcd_write_command(LCD_SET_DISPLAY_ON);
     else
@@ -240,6 +243,9 @@ void lcd_init_device(void)
 void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
                    int bheight, int stride)
 {
+    if(!display_on)
+        return;
+
     /* Copy display bitmap to hardware */
     while (bheight--)
     {
@@ -258,6 +264,13 @@ void lcd_blit_mono(const unsigned char *data, int x, int by, int width,
 void lcd_blit_grey_phase(unsigned char *values, unsigned char *phases,
                          int x, int by, int width, int bheight, int stride)
 {
+    /* TODO */
+
+#if 0
+    if(!display_on)
+        return;
+#endif
+
     (void)values;
     (void)phases;
     (void)x;
@@ -274,6 +287,9 @@ void lcd_update(void)
 {
     int y;
 
+    if(!display_on)
+        return;
+
     /* Copy display bitmap to hardware */
     for (y = 0; y < LCD_FBHEIGHT; y++)
     {
@@ -291,6 +307,9 @@ void lcd_update_rect(int x, int y, int width, int height)
 {
     int ymax;
 
+    if(!display_on)
+        return;
+
     /* The Y coordinates have to work on even 8 pixel rows */
     ymax = (y + height-1) >> 3;
     y >>= 3;