Reworked backlight fading by GPIO based PWM to work for other targets

than H1x0. iPod Nano and 5G backlight fading is enabled. To try for your
device, just define HAVE_BACKLIGHT_PWM_FADING in the relevant
config-xxxx.h file. NOTE: Will break your settings, so save a config
file first.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9121 a1c6a512-1295-4272-9138-f99709370657

9 files changed, 132 insertions, 93 deletions

diff --git a/apps/settings.c b/apps/settings.c
index 6fedf66669..7329b12a76 100644
--- a/apps/settings.c
+++ b/apps/settings.c
@@ -90,7 +90,7 @@ const char rec_base_directory[] = REC_BASE_DIR;
 #include "dsp.h"
 #endif
 
-#define CONFIG_BLOCK_VERSION 37
+#define CONFIG_BLOCK_VERSION 38
 #define CONFIG_BLOCK_SIZE 512
 #define RTC_BLOCK_SIZE 44
 
@@ -436,7 +436,7 @@ static const struct bit_entry hd_bits[] =
     {4, S_O(rec_trigger_mode ), 0, "trigger mode", "off,once,repeat"},
 #endif
 
-#if CONFIG_BACKLIGHT == BL_IRIVER_H100
+#ifdef HAVE_BACKLIGHT_PWM_FADING
     /* backlight fading */
     {2, S_O(backlight_fade_in), 1, "backlight fade in", "off,500ms,1s,2s"},
     {3, S_O(backlight_fade_out), 3, "backlight fade out",
@@ -997,7 +997,7 @@ void settings_apply(void)
 #ifdef HAVE_CHARGING
     backlight_set_timeout_plugged(global_settings.backlight_timeout_plugged);
 #endif
-#if (CONFIG_BACKLIGHT == BL_IRIVER_H100) && !defined(SIMULATOR)
+#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
     backlight_set_fade_in(global_settings.backlight_fade_in);
     backlight_set_fade_out(global_settings.backlight_fade_out);
 #endif
diff --git a/apps/settings.h b/apps/settings.h
index 3d129ba6e6..52e949ea9e 100644
--- a/apps/settings.h
+++ b/apps/settings.h
@@ -271,7 +271,7 @@ struct user_settings
                                1=always,
                                then according to timeout_values[] */
     int backlight_timeout_plugged;
-#if CONFIG_BACKLIGHT == BL_IRIVER_H100
+#ifdef HAVE_BACKLIGHT_PWM_FADING
     int backlight_fade_in;  /* backlight fade in timing: 0..3 */
     int backlight_fade_out; /* backlight fade in timing: 0..7 */
 #endif
diff --git a/apps/settings_menu.c b/apps/settings_menu.c
index 517c7f1f6b..6e8d62191f 100644
--- a/apps/settings_menu.c
+++ b/apps/settings_menu.c
@@ -191,7 +191,7 @@ static bool backlight_timer(void)
                       backlight_set_timeout );
 }
 
-#if (CONFIG_BACKLIGHT == BL_IRIVER_H100) && !defined(SIMULATOR)
+#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
 static bool backlight_fade_in(void)
 {
     static const struct opt_items names[] = {
@@ -1087,7 +1087,7 @@ static bool custom_remote_wps_browse(void)
     return rockbox_browse(WPS_DIR, SHOW_RWPS);
 }
 #endif
-        
+
 static bool custom_cfg_browse(void)
 {
     return rockbox_browse(ROCKBOX_DIR, SHOW_CFG);
@@ -1614,7 +1614,7 @@ static bool lcd_settings_menu(void)
         { ID2P(LANG_BACKLIGHT_ON_WHEN_CHARGING), backlight_timer_plugged },
 #endif
         { ID2P(LANG_CAPTION_BACKLIGHT), caption_backlight },
-#if (CONFIG_BACKLIGHT == BL_IRIVER_H100) && !defined(SIMULATOR)
+#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
         { ID2P(LANG_BACKLIGHT_FADE_IN), backlight_fade_in },
         { ID2P(LANG_BACKLIGHT_FADE_OUT), backlight_fade_out },
 #endif
diff --git a/firmware/backlight.c b/firmware/backlight.c
index 9d48f0d660..9aace01b2e 100644
--- a/firmware/backlight.c
+++ b/firmware/backlight.c
@@ -41,6 +41,88 @@
 #include "lcd-remote.h"
 #endif
 
+/* Basic low-level code that simply switches backlight on or off. Probably
+ * a nice candidate for inclusion in the target/ dir. */
+static inline void __backlight_on(void)
+{
+#ifdef SIMULATOR
+    sim_backlight(100);
+#elif CONFIG_BACKLIGHT == BL_IRIVER_H100
+    and_l(~0x00020000, &GPIO1_OUT);
+#elif CONFIG_BACKLIGHT == BL_IRIVER_H300
+    lcd_enable(true);
+    or_l(0x00020000, &GPIO1_OUT);    
+#elif CONFIG_BACKLIGHT == BL_RTC
+    /* Enable square wave */
+    rtc_write(0x0a, rtc_read(0x0a) | 0x40);
+#elif CONFIG_BACKLIGHT == BL_PA14_LO /* Player */
+    and_b(~0x40, &PADRH); /* drive and set low */
+    or_b(0x40, &PAIORH);
+#elif CONFIG_BACKLIGHT == BL_PA14_HI /* Ondio */
+    or_b(0x40, &PADRH); /* drive it high */
+#elif CONFIG_BACKLIGHT == BL_GMINI
+    P1 |= 0x10;
+#elif CONFIG_BACKLIGHT == BL_IPOD4G
+    /* brightness full */
+    outl(0x80000000 | (0xff << 16), 0x7000a010);
+
+    /* set port b bit 3 on */
+    outl(((0x100 | 1) << 3), 0x6000d824);
+#elif CONFIG_BACKLIGHT==BL_IPODMINI
+    /* set port B03 on */
+    outl(((0x100 | 1) << 3), 0x6000d824);
+#elif CONFIG_BACKLIGHT==BL_IPODNANO
+    /* set port B03 on */
+    outl(((0x100 | 1) << 3), 0x6000d824);
+
+    /* set port L07 on */
+    outl(((0x100 | 1) << 7), 0x6000d12c);
+#elif CONFIG_BACKLIGHT==BL_IPOD3G
+    lcd_enable(true);
+#elif CONFIG_BACKLIGHT==BL_IRIVER_IFP7XX
+    GPIO3_SET = 1;
+#endif
+}
+
+static inline void __backlight_off(void)
+{
+#ifdef SIMULATOR
+    sim_backlight(0);
+#elif CONFIG_BACKLIGHT == BL_IRIVER_H100
+    or_l(0x00020000, &GPIO1_OUT);
+#elif CONFIG_BACKLIGHT == BL_IRIVER_H300
+    and_l(~0x00020000, &GPIO1_OUT);
+    lcd_enable(false);
+#elif CONFIG_BACKLIGHT == BL_RTC
+    /* Disable square wave */
+    rtc_write(0x0a, rtc_read(0x0a) & ~0x40);
+#elif CONFIG_BACKLIGHT == BL_PA14_LO /* Player */
+    and_b(~0x40, &PAIORH); /* let it float (up) */
+#elif CONFIG_BACKLIGHT == BL_PA14_HI /* Ondio */
+    and_b(~0x40, &PADRH); /* drive it low */
+#elif CONFIG_BACKLIGHT == BL_GMINI
+    P1 &= ~0x10;
+#elif CONFIG_BACKLIGHT == BL_IPOD4G
+   /* fades backlight off on 4g */
+   outl(inl(0x70000084) & ~0x2000000, 0x70000084);
+   outl(0x80000000, 0x7000a010);
+#elif CONFIG_BACKLIGHT==BL_IPODNANO
+    /* set port B03 off */
+    outl(((0x100 | 0) << 3), 0x6000d824);
+
+    /* set port L07 off */
+    outl(((0x100 | 0) << 7), 0x6000d12c);
+#elif CONFIG_BACKLIGHT==BL_IRIVER_IFP7XX
+    GPIO3_CLR = 1;
+#elif CONFIG_BACKLIGHT==BL_IPOD3G
+    lcd_enable(false);
+#elif CONFIG_BACKLIGHT==BL_IPODMINI
+    /* set port B03 off */
+    outl(((0x100 | 0) << 3), 0x6000d824);
+#endif
+}
+
+
 #if defined(CONFIG_BACKLIGHT) && !defined(BOOTLOADER)
 
 const char backlight_timeout_value[19] =
@@ -73,7 +155,7 @@ static int remote_backlight_timeout_plugged = 5*HZ;
 #endif
 #endif
 
-#if (CONFIG_BACKLIGHT == BL_IRIVER_H100) && !defined(SIMULATOR)
+#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
 /* backlight fading */
 #define BL_PWM_INTERVAL 5000  /* Cycle interval in µs */
 #define BL_PWM_COUNT    100
@@ -93,7 +175,7 @@ static void backlight_isr(void)
     int timer_period;
     bool idle = false;
     
-    timer_period = CPU_FREQ / 1000 * BL_PWM_INTERVAL / 1000;
+    timer_period = TIMER_FREQ / 1000 * BL_PWM_INTERVAL / 1000;
     switch (bl_dim_state) 
     {
       /* New cycle */
@@ -103,7 +185,7 @@ static void backlight_isr(void)
         
         if (bl_dim_current > 0 && bl_dim_current < BL_PWM_COUNT)
         {
-            and_l(~0x00020000, &GPIO1_OUT);
+            __backlight_on();
             bl_pwm_counter = bl_dim_current;
             timer_period = timer_period * bl_pwm_counter / BL_PWM_COUNT;
             bl_dim_state = DIM_STATE_MAIN;
@@ -111,10 +193,9 @@ static void backlight_isr(void)
         else
         {
             if (bl_dim_current)
-                and_l(~0x00020000, &GPIO1_OUT);
+                __backlight_on();
             else
-                or_l(0x00020000, &GPIO1_OUT);
-
+                __backlight_off();
             if (bl_dim_current == bl_dim_target)
                 idle = true;
         }
@@ -123,7 +204,7 @@ static void backlight_isr(void)
         
       /* Dim main screen */
       case DIM_STATE_MAIN:
-        or_l(0x00020000, &GPIO1_OUT);
+        __backlight_off();
         bl_dim_state = DIM_STATE_START;
         timer_period = timer_period * (BL_PWM_COUNT - bl_pwm_counter) / BL_PWM_COUNT;
         break ;
@@ -143,7 +224,9 @@ static void backlight_isr(void)
 
     if (idle) 
     {
+#ifdef CPU_COLDFIRE
         queue_post(&backlight_queue, BACKLIGHT_UNBOOST_CPU, NULL);
+#endif
         timer_unregister();
         bl_timer_active = false;
     }
@@ -155,19 +238,21 @@ static void backlight_switch(void)
 {
     if (bl_dim_target > (BL_PWM_COUNT/2))
     {
-        and_l(~0x00020000, &GPIO1_OUT);
+        __backlight_on();
         bl_dim_current = BL_PWM_COUNT;
     }
     else
     {
-        or_l(0x00020000, &GPIO1_OUT);
+        __backlight_off();
         bl_dim_current = 0;
     }
 }
 
 static void backlight_release_timer(void)
 {
+#ifdef CPU_COLDFIRE
     cpu_boost(false);
+#endif
     timer_unregister();
     bl_timer_active = false;
     backlight_switch();
@@ -186,8 +271,10 @@ static void backlight_dim(int value)
 
     if (timer_register(0, backlight_release_timer, 1, 0, backlight_isr))
     {
+#ifdef CPU_COLDFIRE
         /* Prevent cpu frequency changes while dimming. */
         cpu_boost(true);
+#endif
         bl_timer_active = true;
     }
     else
@@ -203,96 +290,35 @@ void backlight_set_fade_out(int index)
 {
     fade_out_count = backlight_fade_value[index];
 }
-#endif /* (CONFIG_BACKLIGHT == BL_IRIVER_H100) && !defined(SIMULATOR) */
+#endif /* defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR) */
 
-static void __backlight_on(void)
+static void _backlight_on(void)
 {
-#ifdef SIMULATOR
-    sim_backlight(100);
-#elif CONFIG_BACKLIGHT == BL_IRIVER_H100
+#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
     if (fade_in_count > 0)
         backlight_dim(BL_PWM_COUNT);
     else
     {
         bl_dim_target = bl_dim_current = BL_PWM_COUNT;
-        and_l(~0x00020000, &GPIO1_OUT);
+        __backlight_on();
     }
-#elif CONFIG_BACKLIGHT == BL_IRIVER_H300
-    lcd_enable(true);
-    or_l(0x00020000, &GPIO1_OUT);    
-#elif CONFIG_BACKLIGHT == BL_RTC
-    /* Enable square wave */
-    rtc_write(0x0a, rtc_read(0x0a) | 0x40);
-#elif CONFIG_BACKLIGHT == BL_PA14_LO /* Player */
-    and_b(~0x40, &PADRH); /* drive and set low */
-    or_b(0x40, &PAIORH);
-#elif CONFIG_BACKLIGHT == BL_PA14_HI /* Ondio */
-    or_b(0x40, &PADRH); /* drive it high */
-#elif CONFIG_BACKLIGHT == BL_GMINI
-    P1 |= 0x10;
-#elif CONFIG_BACKLIGHT == BL_IPOD4G
-    /* brightness full */
-    outl(0x80000000 | (0xff << 16), 0x7000a010);
-
-    /* set port b bit 3 on */
-    outl(((0x100 | 1) << 3), 0x6000d824);
-#elif CONFIG_BACKLIGHT==BL_IPODMINI
-    /* set port B03 on */
-    outl(((0x100 | 1) << 3), 0x6000d824);
-#elif CONFIG_BACKLIGHT==BL_IPODNANO
-    /* set port B03 on */
-    outl(((0x100 | 1) << 3), 0x6000d824);
-
-    /* set port L07 on */
-    outl(((0x100 | 1) << 7), 0x6000d12c);
-#elif CONFIG_BACKLIGHT==BL_IPOD3G
-    lcd_enable(true);
-#elif CONFIG_BACKLIGHT==BL_IRIVER_IFP7XX
-    GPIO3_SET = 1;
+#else
+    __backlight_on();
 #endif
 }
 
-static void __backlight_off(void)
+static void _backlight_off(void)
 {
-#ifdef SIMULATOR
-    sim_backlight(0);
-#elif CONFIG_BACKLIGHT == BL_IRIVER_H100
+#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
     if (fade_out_count > 0)
         backlight_dim(0);
     else
     {
         bl_dim_target = bl_dim_current = 0;
-        or_l(0x00020000, &GPIO1_OUT);
+        __backlight_off();
     }
-#elif CONFIG_BACKLIGHT == BL_IRIVER_H300
-    and_l(~0x00020000, &GPIO1_OUT);
-    lcd_enable(false);
-#elif CONFIG_BACKLIGHT == BL_RTC
-    /* Disable square wave */
-    rtc_write(0x0a, rtc_read(0x0a) & ~0x40);
-#elif CONFIG_BACKLIGHT == BL_PA14_LO /* Player */
-    and_b(~0x40, &PAIORH); /* let it float (up) */
-#elif CONFIG_BACKLIGHT == BL_PA14_HI /* Ondio */
-    and_b(~0x40, &PADRH); /* drive it low */
-#elif CONFIG_BACKLIGHT == BL_GMINI
-    P1 &= ~0x10;
-#elif CONFIG_BACKLIGHT == BL_IPOD4G
-   /* fades backlight off on 4g */
-   outl(inl(0x70000084) & ~0x2000000, 0x70000084);
-   outl(0x80000000, 0x7000a010);
-#elif CONFIG_BACKLIGHT==BL_IPODNANO
-    /* set port B03 off */
-    outl(((0x100 | 0) << 3), 0x6000d824);
-
-    /* set port L07 off */
-    outl(((0x100 | 0) << 7), 0x6000d12c);
-#elif CONFIG_BACKLIGHT==BL_IRIVER_IFP7XX
-    GPIO3_CLR = 1;
-#elif CONFIG_BACKLIGHT==BL_IPOD3G
-    lcd_enable(false);
-#elif CONFIG_BACKLIGHT==BL_IPODMINI
-    /* set port B03 off */
-    outl(((0x100 | 0) << 3), 0x6000d824);
+#else
+    __backlight_off();
 #endif
 }
 
@@ -374,19 +400,20 @@ void backlight_thread(void)
                 if (backlight_timer < 0) /* Backlight == OFF in the setting? */
                 {
                     backlight_timer = 0; /* Disable the timeout */
-                    __backlight_off();
+                    _backlight_off();
                 }
                 else 
                 {
-                    __backlight_on();
+                    _backlight_on();
                 }
                 break;
                 
             case BACKLIGHT_OFF:
-                __backlight_off();
+                _backlight_off();
                 break;
 
-#if (CONFIG_BACKLIGHT == BL_IRIVER_H100) && !defined(SIMULATOR)
+#if defined(HAVE_BACKLIGHT_PWM_FADING) && defined(CPU_COLDFIRE) \
+    && !defined(SIMULATOR)
             case BACKLIGHT_UNBOOST_CPU:
                 cpu_boost(false);
                 break;
diff --git a/firmware/export/backlight.h b/firmware/export/backlight.h
index 05d395f4a6..e182803898 100644
--- a/firmware/export/backlight.h
+++ b/firmware/export/backlight.h
@@ -27,7 +27,7 @@ void backlight_set_timeout(int index);
 #ifdef CONFIG_BACKLIGHT
 void backlight_init(void);
 int  backlight_get_current_timeout(void);
-#if CONFIG_BACKLIGHT == BL_IRIVER_H100
+#ifdef HAVE_BACKLIGHT_PWM_FADING
 void backlight_set_fade_in(int index);
 void backlight_set_fade_out(int index);
 #endif
diff --git a/firmware/export/config-h100.h b/firmware/export/config-h100.h
index bdbcce71a4..bc8968902d 100644
--- a/firmware/export/config-h100.h
+++ b/firmware/export/config-h100.h
@@ -40,6 +40,9 @@
 /* Define this for LCD backlight available */
 #define CONFIG_BACKLIGHT BL_IRIVER_H100 /* port controlled */
 
+/* We can fade the backlight by using PWM */
+#define HAVE_BACKLIGHT_PWM_FADING
+
 /* Define this if you have a software controlled poweroff */
 #define HAVE_SW_POWEROFF
 
diff --git a/firmware/export/config-h120.h b/firmware/export/config-h120.h
index aea6011e63..bbfa942ee7 100644
--- a/firmware/export/config-h120.h
+++ b/firmware/export/config-h120.h
@@ -36,6 +36,9 @@
 /* Define this for LCD backlight available */
 #define CONFIG_BACKLIGHT BL_IRIVER_H100 /* port controlled */
 
+/* We can fade the backlight by using PWM */
+#define HAVE_BACKLIGHT_PWM_FADING
+
 /* Define this if you have a software controlled poweroff */
 #define HAVE_SW_POWEROFF
 
diff --git a/firmware/export/config-ipodnano.h b/firmware/export/config-ipodnano.h
index 6bcbffb3b2..142fb272f9 100644
--- a/firmware/export/config-ipodnano.h
+++ b/firmware/export/config-ipodnano.h
@@ -48,6 +48,9 @@
 /* Define this for LCD backlight available */
 #define CONFIG_BACKLIGHT BL_IPODNANO /* port controlled */
 
+/* We can fade the backlight by using PWM */
+#define HAVE_BACKLIGHT_PWM_FADING
+
 #ifndef SIMULATOR
 
 /* The Nano actually has a PP5021 - but it's register compatible with 
diff --git a/firmware/export/config-ipodvideo.h b/firmware/export/config-ipodvideo.h
index 6ea9fcebb8..9536cc8b8f 100644
--- a/firmware/export/config-ipodvideo.h
+++ b/firmware/export/config-ipodvideo.h
@@ -48,6 +48,9 @@
 /* Define this for LCD backlight available */
 #define CONFIG_BACKLIGHT BL_IPODNANO /* port controlled */
 
+/* We can fade the backlight by using PWM */
+#define HAVE_BACKLIGHT_PWM_FADING
+
 #ifndef SIMULATOR
 
 /* The Nano actually has a PP5021 - but it's register compatible with