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rockbox/firmware/backlight.c
Michael Giacomelli 2d8cd814ac Increase backlight priority to the same level as UI so that there is no longer a long delay when activating it during heavy CPU load. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16543 a1c6a512-1295-4272-9138-f99709370657
2008-03-07 00:51:36 +00:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include <stdlib.h>
#include "cpu.h"
#include "kernel.h"
#include "thread.h"
#include "i2c.h"
#include "debug.h"
#include "rtc.h"
#include "usb.h"
#include "power.h"
#include "system.h"
#include "button.h"
#include "timer.h"
#include "backlight.h"
#if defined(HAVE_LCD_ENABLE) || defined(HAVE_LCD_SLEEP)
#include "lcd.h" /* for lcd_enable() and lcd_sleep() */
#endif
#ifdef HAVE_REMOTE_LCD
#include "lcd-remote.h"
#endif
#ifndef SIMULATOR
#include "backlight-target.h"
#endif
#ifdef SIMULATOR
/* TODO: find a better way to do it but we need a kernel thread somewhere to
handle this */
extern void screen_dump(void);
static inline void _backlight_on(void)
{
sim_backlight(100);
}
static inline void _backlight_off(void)
{
sim_backlight(0);
}
static inline void _backlight_set_brightness(int val)
{
(void)val;
}
static inline void _buttonlight_on(void)
{
}
static inline void _buttonlight_off(void)
{
}
static inline void _buttonlight_set_brightness(int val)
{
(void)val;
}
#ifdef HAVE_REMOTE_LCD
static inline void _remote_backlight_on(void)
{
sim_remote_backlight(100);
}
static inline void _remote_backlight_off(void)
{
sim_remote_backlight(0);
}
#endif /* HAVE_REMOTE_LCD */
#endif /* SIMULATOR */
#if defined(HAVE_BACKLIGHT) && !defined(BOOTLOADER)
enum {
BACKLIGHT_ON,
BACKLIGHT_OFF,
#ifdef HAVE_REMOTE_LCD
REMOTE_BACKLIGHT_ON,
REMOTE_BACKLIGHT_OFF,
#endif
#if defined(_BACKLIGHT_FADE_BOOST) || defined(_BACKLIGHT_FADE_ENABLE)
BACKLIGHT_FADE_FINISH,
#endif
#ifdef HAVE_LCD_SLEEP
LCD_SLEEP,
#endif
#ifdef HAVE_BUTTON_LIGHT
BUTTON_LIGHT_ON,
BUTTON_LIGHT_OFF,
#endif
};
static void backlight_thread(void);
static long backlight_stack[DEFAULT_STACK_SIZE/sizeof(long)];
static const char backlight_thread_name[] = "backlight";
static struct event_queue backlight_queue;
static int backlight_timer;
static int backlight_timeout;
static int backlight_timeout_normal = 5*HZ;
#if CONFIG_CHARGING
static int backlight_timeout_plugged = 5*HZ;
#endif
#ifdef HAS_BUTTON_HOLD
static int backlight_on_button_hold = 0;
#endif
#ifdef HAVE_BUTTON_LIGHT
static int buttonlight_timer;
int _buttonlight_timeout = 5*HZ;
/* Update state of buttonlight according to timeout setting */
static void buttonlight_update_state(void)
{
buttonlight_timer = _buttonlight_timeout;
/* Buttonlight == OFF in the setting? */
if (buttonlight_timer < 0)
{
buttonlight_timer = 0; /* Disable the timeout */
_buttonlight_off();
}
else
_buttonlight_on();
}
/* external interface */
void buttonlight_on(void)
{
queue_remove_from_head(&backlight_queue, BUTTON_LIGHT_ON);
queue_post(&backlight_queue, BUTTON_LIGHT_ON, 0);
}
void buttonlight_off(void)
{
queue_post(&backlight_queue, BUTTON_LIGHT_OFF, 0);
}
void buttonlight_set_timeout(int value)
{
_buttonlight_timeout = HZ * value;
buttonlight_update_state();
}
#endif
#ifdef HAVE_REMOTE_LCD
static int remote_backlight_timer;
static int remote_backlight_timeout;
static int remote_backlight_timeout_normal = 5*HZ;
#if CONFIG_CHARGING
static int remote_backlight_timeout_plugged = 5*HZ;
#endif
#ifdef HAS_REMOTE_BUTTON_HOLD
static int remote_backlight_on_button_hold = 0;
#endif
#endif
#ifdef HAVE_LCD_SLEEP
const signed char lcd_sleep_timeout_value[10] =
{
-1, 0, 5, 10, 15, 20, 30, 45, 60, 90
};
int _lcd_sleep_timer;
int _lcd_sleep_timeout = 10*HZ;
#endif
#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
/* backlight fading */
#define BL_PWM_INTERVAL 5 /* Cycle interval in ms */
#define BL_PWM_BITS 8
#define BL_PWM_COUNT (1<<BL_PWM_BITS)
/* s15.16 fixed point variables */
static int32_t bl_fade_in_step = ((BL_PWM_INTERVAL*BL_PWM_COUNT)<<16)/300;
static int32_t bl_fade_out_step = ((BL_PWM_INTERVAL*BL_PWM_COUNT)<<16)/2000;
static int32_t bl_dim_fraction = 0;
static int bl_dim_target = 0;
static int bl_dim_current = 0;
static enum {DIM_STATE_START, DIM_STATE_MAIN} bl_dim_state = DIM_STATE_START;
static bool bl_timer_active = false;
static void backlight_isr(void)
{
int timer_period = (TIMER_FREQ*BL_PWM_INTERVAL/1000);
bool idle = false;
switch (bl_dim_state)
{
/* New cycle */
case DIM_STATE_START:
bl_dim_current = bl_dim_fraction >> 16;
if (bl_dim_current > 0 && bl_dim_current < BL_PWM_COUNT)
{
_backlight_on_isr();
timer_period = (timer_period * bl_dim_current) >> BL_PWM_BITS;
bl_dim_state = DIM_STATE_MAIN;
}
else
{
if (bl_dim_current)
_backlight_on_isr();
else
_backlight_off_isr();
if (bl_dim_current == bl_dim_target)
idle = true;
}
if (bl_dim_current < bl_dim_target)
{
bl_dim_fraction = MIN(bl_dim_fraction + bl_fade_in_step,
(BL_PWM_COUNT<<16));
}
else if (bl_dim_current > bl_dim_target)
{
bl_dim_fraction = MAX(bl_dim_fraction - bl_fade_out_step, 0);
}
break;
/* Dim main screen */
case DIM_STATE_MAIN:
_backlight_off_isr();
timer_period = (timer_period * (BL_PWM_COUNT - bl_dim_current))
>> BL_PWM_BITS;
bl_dim_state = DIM_STATE_START;
break ;
}
if (idle)
{
#if defined(_BACKLIGHT_FADE_BOOST) || defined(_BACKLIGHT_FADE_ENABLE)
queue_post(&backlight_queue, BACKLIGHT_FADE_FINISH, 0);
#endif
timer_unregister();
bl_timer_active = false;
}
else
timer_set_period(timer_period);
}
static void backlight_switch(void)
{
if (bl_dim_target > (BL_PWM_COUNT/2))
{
_backlight_on_normal();
bl_dim_fraction = (BL_PWM_COUNT<<16);
}
else
{
_backlight_off_normal();
bl_dim_fraction = 0;
}
}
static void backlight_release_timer(void)
{
#ifdef _BACKLIGHT_FADE_BOOST
cpu_boost(false);
#endif
timer_unregister();
bl_timer_active = false;
backlight_switch();
}
static void backlight_dim(int value)
{
/* protect from extraneous calls with the same target value */
if (value == bl_dim_target)
return;
bl_dim_target = value;
if (bl_timer_active)
return ;
if (timer_register(0, backlight_release_timer, 2, 0, backlight_isr))
{
#ifdef _BACKLIGHT_FADE_BOOST
/* Prevent cpu frequency changes while dimming. */
cpu_boost(true);
#endif
bl_timer_active = true;
}
else
backlight_switch();
}
static void _backlight_on(void)
{
if (bl_fade_in_step > 0)
{
#ifdef _BACKLIGHT_FADE_ENABLE
_backlight_hw_enable(true);
#endif
backlight_dim(BL_PWM_COUNT);
}
else
{
bl_dim_target = BL_PWM_COUNT;
bl_dim_fraction = (BL_PWM_COUNT<<16);
_backlight_on_normal();
}
#ifdef HAVE_LCD_SLEEP
_lcd_sleep_timer = 0; /* LCD should be awake already */
#endif
}
static void _backlight_off(void)
{
if (bl_fade_out_step > 0)
{
backlight_dim(0);
}
else
{
bl_dim_target = bl_dim_fraction = 0;
_backlight_off_normal();
}
#ifdef HAVE_LCD_SLEEP
/* Start LCD sleep countdown */
if (_lcd_sleep_timeout < 0)
{
_lcd_sleep_timer = 0; /* Setting == Always */
lcd_sleep();
}
else
_lcd_sleep_timer = _lcd_sleep_timeout;
#endif
}
void backlight_set_fade_in(int value)
{
if (value > 0)
bl_fade_in_step = ((BL_PWM_INTERVAL*BL_PWM_COUNT)<<16) / value;
else
bl_fade_in_step = 0;
}
void backlight_set_fade_out(int value)
{
if (value > 0)
bl_fade_out_step = ((BL_PWM_INTERVAL*BL_PWM_COUNT)<<16) / value;
else
bl_fade_out_step = 0;
}
#endif /* defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR) */
/* Update state of backlight according to timeout setting */
static void backlight_update_state(void)
{
#ifdef HAS_BUTTON_HOLD
if (button_hold() && (backlight_on_button_hold != 0))
backlight_timeout = (backlight_on_button_hold == 2) ? 0 : -1;
/* always on or always off */
else
#endif
#if CONFIG_CHARGING
if (charger_inserted()
#ifdef HAVE_USB_POWER
|| usb_powered()
#endif
)
backlight_timeout = backlight_timeout_plugged;
else
#endif
backlight_timeout = backlight_timeout_normal;
/* Backlight == OFF in the setting? */
if (backlight_timeout < 0)
{
backlight_timer = 0; /* Disable the timeout */
_backlight_off();
}
else
{
backlight_timer = backlight_timeout;
_backlight_on();
}
}
#ifdef HAVE_REMOTE_LCD
/* Update state of remote backlight according to timeout setting */
static void remote_backlight_update_state(void)
{
#ifdef HAS_REMOTE_BUTTON_HOLD
if (remote_button_hold() && (remote_backlight_on_button_hold != 0))
remote_backlight_timeout = (remote_backlight_on_button_hold == 2)
? 0 : -1; /* always on or always off */
else
#endif
#if CONFIG_CHARGING
if (charger_inserted()
#ifdef HAVE_USB_POWER
|| usb_powered()
#endif
)
remote_backlight_timeout = remote_backlight_timeout_plugged;
else
#endif
remote_backlight_timeout = remote_backlight_timeout_normal;
/* Backlight == OFF in the setting? */
if (remote_backlight_timeout < 0)
{
remote_backlight_timer = 0; /* Disable the timeout */
_remote_backlight_off();
}
else
{
remote_backlight_timer = remote_backlight_timeout;
_remote_backlight_on();
}
}
#endif /* HAVE_REMOTE_LCD */
void backlight_thread(void)
{
struct queue_event ev;
bool locked = false;
while(1)
{
queue_wait(&backlight_queue, &ev);
switch(ev.id)
{ /* These events must always be processed */
#ifdef _BACKLIGHT_FADE_BOOST
case BACKLIGHT_FADE_FINISH:
cpu_boost(false);
break;
#endif
#ifdef _BACKLIGHT_FADE_ENABLE
case BACKLIGHT_FADE_FINISH:
_backlight_hw_enable((bl_dim_current|bl_dim_target) != 0);
break;
#endif
#if defined(HAVE_REMOTE_LCD) && !defined(SIMULATOR)
/* Here for now or else the aggressive init messes up scrolling */
case SYS_REMOTE_PLUGGED:
lcd_remote_on();
lcd_remote_update();
break;
case SYS_REMOTE_UNPLUGGED:
lcd_remote_off();
break;
#endif /* defined(HAVE_REMOTE_LCD) && !defined(SIMULATOR) */
#ifdef SIMULATOR
/* This one here too for lack of a better place */
case SYS_SCREENDUMP:
screen_dump();
break;
#endif
case SYS_USB_CONNECTED:
/* Tell the USB thread that we are safe */
DEBUGF("backlight_thread got SYS_USB_CONNECTED\n");
usb_acknowledge(SYS_USB_CONNECTED_ACK);
break;
case SYS_USB_DISCONNECTED:
usb_acknowledge(SYS_USB_DISCONNECTED_ACK);
break;
}
if (locked)
continue;
switch(ev.id)
{ /* These events are only processed if backlight isn't locked */
#ifdef HAVE_REMOTE_LCD
case REMOTE_BACKLIGHT_ON:
remote_backlight_update_state();
break;
case REMOTE_BACKLIGHT_OFF:
remote_backlight_timer = 0; /* Disable the timeout */
_remote_backlight_off();
break;
#endif /* HAVE_REMOTE_LCD */
case BACKLIGHT_ON:
backlight_update_state();
break;
case BACKLIGHT_OFF:
backlight_timer = 0; /* Disable the timeout */
_backlight_off();
break;
#ifdef HAVE_LCD_SLEEP
case LCD_SLEEP:
lcd_sleep();
break;
#endif
#ifdef HAVE_BUTTON_LIGHT
case BUTTON_LIGHT_ON:
buttonlight_update_state();
break;
case BUTTON_LIGHT_OFF:
buttonlight_timer = 0;
_buttonlight_off();
break;
#endif
case SYS_POWEROFF: /* Lock backlight on poweroff so it doesn't */
locked = true; /* go off before power is actually cut. */
/* fall through */
#if CONFIG_CHARGING
case SYS_CHARGER_CONNECTED:
case SYS_CHARGER_DISCONNECTED:
#endif
backlight_update_state();
#ifdef HAVE_REMOTE_LCD
remote_backlight_update_state();
#endif
break;
}
} /* end while */
}
static void backlight_tick(void)
{
if(backlight_timer)
{
backlight_timer--;
if(backlight_timer == 0)
{
backlight_off();
}
}
#ifdef HAVE_LCD_SLEEP
else if(_lcd_sleep_timer)
{
_lcd_sleep_timer--;
if(_lcd_sleep_timer == 0)
{
/* Queue on bl thread or freeze! */
queue_post(&backlight_queue, LCD_SLEEP, 0);
}
}
#endif /* HAVE_LCD_SLEEP */
#ifdef HAVE_REMOTE_LCD
if(remote_backlight_timer)
{
remote_backlight_timer--;
if(remote_backlight_timer == 0)
{
remote_backlight_off();
}
}
#endif /* HAVE_REMOVE_LCD */
#ifdef HAVE_BUTTON_LIGHT
if (buttonlight_timer)
{
buttonlight_timer--;
if (buttonlight_timer == 0)
{
buttonlight_off();
}
}
#endif /* HAVE_BUTTON_LIGHT */
}
void backlight_init(void)
{
queue_init(&backlight_queue, true);
#ifndef SIMULATOR
if (_backlight_init())
{
# ifdef HAVE_BACKLIGHT_PWM_FADING
/* If backlight is already on, don't fade in. */
bl_dim_target = BL_PWM_COUNT;
bl_dim_fraction = (BL_PWM_COUNT<<16);
# endif
}
#endif
/* Leave all lights as set by the bootloader here. The settings load will
* call the appropriate backlight_set_*() functions, only changing light
* status if necessary. */
create_thread(backlight_thread, backlight_stack,
sizeof(backlight_stack), 0, backlight_thread_name
IF_PRIO(, PRIORITY_USER_INTERFACE)
IF_COP(, CPU));
tick_add_task(backlight_tick);
}
void backlight_on(void)
{
queue_remove_from_head(&backlight_queue, BACKLIGHT_ON);
queue_post(&backlight_queue, BACKLIGHT_ON, 0);
}
void backlight_off(void)
{
queue_post(&backlight_queue, BACKLIGHT_OFF, 0);
}
/* returns true when the backlight is on OR when it's set to always off */
bool is_backlight_on(void)
{
if (backlight_timer || backlight_timeout <= 0)
return true;
else
return false;
}
/* return value in ticks; 0 means always on, <0 means always off */
int backlight_get_current_timeout(void)
{
return backlight_timeout;
}
void backlight_set_timeout(int value)
{
backlight_timeout_normal = HZ * value;
backlight_update_state();
}
#if CONFIG_CHARGING
void backlight_set_timeout_plugged(int value)
{
backlight_timeout_plugged = HZ * value;
backlight_update_state();
}
#endif /* CONFIG_CHARGING */
#ifdef HAS_BUTTON_HOLD
/* Hold button change event handler. */
void backlight_hold_changed(bool hold_button)
{
if (!hold_button || (backlight_on_button_hold > 0))
/* if unlocked or override in effect */
backlight_on();
}
void backlight_set_on_button_hold(int index)
{
if ((unsigned)index >= 3)
/* if given a weird value, use default */
index = 0;
backlight_on_button_hold = index;
backlight_update_state();
}
#endif /* HAS_BUTTON_HOLD */
#ifdef HAVE_LCD_SLEEP
void lcd_set_sleep_after_backlight_off(int index)
{
if ((unsigned)index >= sizeof(lcd_sleep_timeout_value))
/* if given a weird value, use default */
index = 3;
_lcd_sleep_timeout = HZ * lcd_sleep_timeout_value[index];
if (backlight_timer > 0 || backlight_get_current_timeout() == 0)
/* Timer will be set when bl turns off or bl set to on. */
return;
/* Backlight is Off */
if (_lcd_sleep_timeout < 0)
_lcd_sleep_timer = 1; /* Always - sleep next tick */
else
_lcd_sleep_timer = _lcd_sleep_timeout; /* Never, other */
}
#endif /* HAVE_LCD_SLEEP */
#ifdef HAVE_REMOTE_LCD
void remote_backlight_on(void)
{
queue_post(&backlight_queue, REMOTE_BACKLIGHT_ON, 0);
}
void remote_backlight_off(void)
{
queue_post(&backlight_queue, REMOTE_BACKLIGHT_OFF, 0);
}
void remote_backlight_set_timeout(int value)
{
remote_backlight_timeout_normal = HZ * value;
remote_backlight_update_state();
}
#if CONFIG_CHARGING
void remote_backlight_set_timeout_plugged(int value)
{
remote_backlight_timeout_plugged = HZ * value;
remote_backlight_update_state();
}
#endif /* CONFIG_CHARGING */
#ifdef HAS_REMOTE_BUTTON_HOLD
/* Remote hold button change event handler. */
void remote_backlight_hold_changed(bool rc_hold_button)
{
if (!rc_hold_button || (remote_backlight_on_button_hold > 0))
/* if unlocked or override */
remote_backlight_on();
}
void remote_backlight_set_on_button_hold(int index)
{
if ((unsigned)index >= 3)
/* if given a weird value, use default */
index = 0;
remote_backlight_on_button_hold = index;
remote_backlight_update_state();
}
#endif /* HAS_REMOTE_BUTTON_HOLD */
/* return value in ticks; 0 means always on, <0 means always off */
int remote_backlight_get_current_timeout(void)
{
return remote_backlight_timeout;
}
/* returns true when the backlight is on OR when it's set to always off */
bool is_remote_backlight_on(void)
{
if (remote_backlight_timer != 0 || remote_backlight_timeout <= 0)
return true;
else
return false;
}
#endif /* HAVE_REMOTE_LCD */
#ifdef HAVE_BACKLIGHT_BRIGHTNESS
void backlight_set_brightness(int val)
{
if (val < MIN_BRIGHTNESS_SETTING)
val = MIN_BRIGHTNESS_SETTING;
else if (val > MAX_BRIGHTNESS_SETTING)
val = MAX_BRIGHTNESS_SETTING;
_backlight_set_brightness(val);
}
#endif /* HAVE_BACKLIGHT_BRIGHTNESS */
#ifdef HAVE_BUTTONLIGHT_BRIGHTNESS
void buttonlight_set_brightness(int val)
{
if (val < MIN_BRIGHTNESS_SETTING)
val = MIN_BRIGHTNESS_SETTING;
else if (val > MAX_BRIGHTNESS_SETTING)
val = MAX_BRIGHTNESS_SETTING;
_buttonlight_set_brightness(val);
}
#endif /* HAVE_BUTTONLIGHT_BRIGHTNESS */
#else /* !defined(HAVE_BACKLIGHT) || defined(BOOTLOADER)
-- no backlight, empty dummy functions */
#if defined(BOOTLOADER) && defined(HAVE_BACKLIGHT)
void backlight_init(void)
{
(void)_backlight_init();
_backlight_on();
}
#endif
void backlight_on(void) {}
void backlight_off(void) {}
void buttonlight_on(void) {}
void backlight_set_timeout(int value) {(void)value;}
bool is_backlight_on(void) {return true;}
#ifdef HAVE_REMOTE_LCD
void remote_backlight_on(void) {}
void remote_backlight_off(void) {}
void remote_backlight_set_timeout(int value) {(void)value;}
bool is_remote_backlight_on(void) {return true;}
#endif /* HAVE_REMOTE_LCD */
#ifdef HAVE_BACKLIGHT_BRIGHTNESS
void backlight_set_brightness(int val) { (void)val; }
#endif
#ifdef HAVE_BUTTONLIGHT_BRIGHTNESS
void buttonlight_set_brightness(int val) { (void)val; }
#endif
#endif /* defined(HAVE_BACKLIGHT) && !defined(BOOTLOADER) */
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