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rockbox/firmware/backlight.c
Steve Bavin 021413ad5e Don't overflow the backlight event queue with on messages 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11420 a1c6a512-1295-4272-9138-f99709370657
2006-11-03 09:46:26 +00:00

851 lines
22 KiB
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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"
#ifdef HAVE_BACKLIGHT_BRIGHTNESS
#include "pcf50606.h" /* iRiver, iAudio X5 brightness */
#endif
#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
#if defined(TARGET_TREE) && !defined(SIMULATOR)
#include "backlight-target.h"
#endif
#ifdef SIMULATOR
static inline void __backlight_on(void)
{
sim_backlight(100);
}
static inline void __backlight_off(void)
{
sim_backlight(0);
}
#else
/* Basic low-level code that simply switches backlight on or off. Probably
* a nice candidate for inclusion in the target/ dir. */
#ifndef TARGET_TREE
static inline void __backlight_on(void)
{
#if 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_IRIVER_IFP7XX
GPIO3_SET = 1;
#endif
}
static inline void __backlight_off(void)
{
#if 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_IRIVER_IFP7XX
GPIO3_CLR = 1;
#endif
}
#endif
#endif /* SIMULATOR */
#if defined(CONFIG_BACKLIGHT) && !defined(BOOTLOADER)
const signed char backlight_timeout_value[19] =
{
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 45, 60, 90
};
#define BACKLIGHT_ON 1
#define BACKLIGHT_OFF 2
#define REMOTE_BACKLIGHT_ON 3
#define REMOTE_BACKLIGHT_OFF 4
#define BACKLIGHT_UNBOOST_CPU 5
#ifdef HAVE_LCD_SLEEP
#define LCD_SLEEP 6
#endif
static void backlight_thread(void);
static long backlight_stack[DEFAULT_STACK_SIZE/sizeof(long)];
#ifdef X5_BACKLIGHT_SHUTDOWN
#define BACKLIGHT_QUIT 256
/* Need to save this for x5 shutdown */
struct thread_entry* backlight_thread_id;
#endif
static const char backlight_thread_name[] = "backlight";
static struct event_queue backlight_queue;
static int backlight_timer;
static int backlight_timeout = 5*HZ;
#ifdef CONFIG_CHARGING
static int backlight_timeout_plugged = 5*HZ;
#endif
#ifdef HAS_BUTTON_HOLD
static int backlight_on_button_hold = 0;
#endif
#ifdef HAVE_REMOTE_LCD
static int remote_backlight_timer;
static int remote_backlight_timeout = 5*HZ;
#ifdef 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
};
static int lcd_sleep_timer;
static int lcd_sleep_timeout = 10*HZ;
#endif
#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
/* backlight fading */
#define BL_PWM_INTERVAL 5000 /* Cycle interval in s */
#define BL_PWM_COUNT 100
static const char backlight_fade_value[8] = { 0, 1, 2, 4, 6, 8, 10, 20 };
static int fade_in_count = 1;
static int fade_out_count = 4;
static bool bl_timer_active = false;
static int bl_dim_current = BL_PWM_COUNT;
static int bl_dim_target = BL_PWM_COUNT;
static int bl_pwm_counter = 0;
static volatile int bl_cycle_counter = 0;
static enum {DIM_STATE_START, DIM_STATE_MAIN} bl_dim_state = DIM_STATE_START;
static void backlight_isr(void)
{
int timer_period;
bool idle = false;
timer_period = TIMER_FREQ / 1000 * BL_PWM_INTERVAL / 1000;
switch (bl_dim_state)
{
/* New cycle */
case DIM_STATE_START:
bl_pwm_counter = 0;
bl_cycle_counter++;
if (bl_dim_current > 0 && bl_dim_current < BL_PWM_COUNT)
{
__backlight_on();
bl_pwm_counter = bl_dim_current;
timer_period = timer_period * bl_pwm_counter / BL_PWM_COUNT;
bl_dim_state = DIM_STATE_MAIN;
}
else
{
if (bl_dim_current)
__backlight_on();
else
__backlight_off();
if (bl_dim_current == bl_dim_target)
idle = true;
}
break ;
/* Dim main screen */
case DIM_STATE_MAIN:
__backlight_off();
bl_dim_state = DIM_STATE_START;
timer_period = timer_period * (BL_PWM_COUNT - bl_pwm_counter) / BL_PWM_COUNT;
break ;
}
if ((bl_dim_target > bl_dim_current) && (bl_cycle_counter >= fade_in_count))
{
bl_dim_current++;
bl_cycle_counter = 0;
}
if ((bl_dim_target < bl_dim_current) && (bl_cycle_counter >= fade_out_count))
{
bl_dim_current--;
bl_cycle_counter = 0;
}
if (idle)
{
#ifdef CPU_COLDFIRE
queue_post(&backlight_queue, BACKLIGHT_UNBOOST_CPU, NULL);
#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();
bl_dim_current = BL_PWM_COUNT;
}
else
{
__backlight_off();
bl_dim_current = 0;
}
}
static void backlight_release_timer(void)
{
#ifdef CPU_COLDFIRE
cpu_boost_id(false, CPUBOOSTID_BACKLIGHT);
#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 CPU_COLDFIRE
/* Prevent cpu frequency changes while dimming. */
cpu_boost_id(true, CPUBOOSTID_BACKLIGHT);
#endif
bl_timer_active = true;
}
else
backlight_switch();
}
void backlight_set_fade_in(int index)
{
fade_in_count = backlight_fade_value[index];
}
void backlight_set_fade_out(int index)
{
fade_out_count = backlight_fade_value[index];
}
#endif /* defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR) */
static void _backlight_on(void)
{
#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;
__backlight_on();
}
#else
__backlight_on();
#endif
#ifdef HAVE_LCD_SLEEP
lcd_sleep_timer = 0; /* LCD should be awake already */
#endif
}
static void _backlight_off(void)
{
#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
if (fade_out_count > 0)
backlight_dim(0);
else
{
bl_dim_target = bl_dim_current = 0;
__backlight_off();
}
#else
__backlight_off();
#endif
#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
}
#ifdef HAVE_REMOTE_LCD
#ifdef SIMULATOR
static void __remote_backlight_on(void)
{
sim_remote_backlight(100);
}
static void __remote_backlight_off(void)
{
sim_remote_backlight(0);
}
#endif /* SIMULATOR */
#endif /* HAVE_REMOTE_LCD */
/* Update state of backlight according to timeout setting */
static void backlight_update_state(void)
{
#ifdef CONFIG_CHARGING
if (charger_inserted()
#ifdef HAVE_USB_POWER
|| usb_powered()
#endif
)
backlight_timer = backlight_timeout_plugged;
else
#endif
backlight_timer = backlight_timeout;
/* Backlight == OFF in the setting? */
if (backlight_timer < 0)
{
backlight_timer = 0; /* Disable the timeout */
#ifdef HAS_BUTTON_HOLD
if (backlight_on_button_hold == 2 && button_hold())
return; /* Keep on if "On" */
#endif
_backlight_off();
}
else
{
#ifdef HAS_BUTTON_HOLD
if (backlight_on_button_hold == 1 && button_hold())
{
/* Keep off if "Off". */
backlight_timer = 0; /* Disable the timeout */
return;
}
#endif
_backlight_on();
}
}
#ifdef HAVE_REMOTE_LCD
/* Update state of remote backlight according to timeout setting */
static void remote_backlight_update_state(void)
{
#ifdef CONFIG_CHARGING
if (charger_inserted()
#ifdef HAVE_USB_POWER
|| usb_powered()
#endif
)
remote_backlight_timer = remote_backlight_timeout_plugged;
else
#endif
remote_backlight_timer = remote_backlight_timeout;
/* Backlight == OFF in the setting? */
if (remote_backlight_timer < 0)
{
remote_backlight_timer = 0; /* Disable the timeout */
#ifdef HAS_REMOTE_BUTTON_HOLD
if (remote_backlight_on_button_hold == 2 && remote_button_hold())
return; /* Keep on if "On" */
#endif
__remote_backlight_off();
}
else
{
#if defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES)
if (remote_type() == REMOTETYPE_H300_NONLCD)
{
backlight_update_state();
}
else
#endif
{
#ifdef HAS_REMOTE_BUTTON_HOLD
if (remote_backlight_on_button_hold == 1 && remote_button_hold())
{
/* Keep off if "Off". */
remote_backlight_timer = 0; /* Disable the timeout */
return;
}
#endif
__remote_backlight_on();
}
}
}
#endif /* HAVE_REMOTE_LCD */
void backlight_thread(void)
{
struct event ev;
while(1)
{
queue_wait(&backlight_queue, &ev);
switch(ev.id)
{
#ifdef HAVE_REMOTE_LCD
case REMOTE_BACKLIGHT_ON:
remote_backlight_update_state();
break;
case REMOTE_BACKLIGHT_OFF:
remote_backlight_timer = 0; /* Disable the timeout */
#ifdef HAS_REMOTE_BUTTON_HOLD
if (remote_backlight_on_button_hold == 2 &&
remote_button_hold())
break; /* Keep on if "On" */
#endif
__remote_backlight_off();
break;
#endif /* HAVE_REMOTE_LCD */
case BACKLIGHT_ON:
backlight_update_state();
break;
case BACKLIGHT_OFF:
backlight_timer = 0; /* Disable the timeout */
#ifdef HAS_BUTTON_HOLD
if (backlight_on_button_hold == 2 && button_hold())
break; /* Keep on if "On" */
#endif
_backlight_off();
break;
#ifdef HAVE_LCD_SLEEP
case LCD_SLEEP:
lcd_sleep();
break;
#endif
#ifdef X5_BACKLIGHT_SHUTDOWN
case BACKLIGHT_QUIT:
remove_thread(backlight_thread_id);
break;
#endif
#if defined(HAVE_BACKLIGHT_PWM_FADING) && defined(CPU_COLDFIRE) \
&& !defined(SIMULATOR)
case BACKLIGHT_UNBOOST_CPU:
cpu_boost_id(false, CPUBOOSTID_BACKLIGHT);
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;
} /* end switch */
} /* end while */
}
static void backlight_tick(void)
{
#ifdef CONFIG_CHARGING
static bool charger_was_inserted = false;
bool charger_is_inserted = charger_inserted()
#ifdef HAVE_USB_POWER
|| usb_powered()
#endif
;
if( charger_was_inserted != charger_is_inserted )
{
backlight_on();
#ifdef HAVE_REMOTE_LCD
remote_backlight_on();
#endif
}
charger_was_inserted = charger_is_inserted;
#endif /* CONFIG_CHARGING */
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, NULL);
}
}
#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 */
}
void backlight_init(void)
{
queue_init(&backlight_queue, true);
#ifdef X5_BACKLIGHT_SHUTDOWN
backlight_thread_id =
#endif
create_thread(backlight_thread, backlight_stack,
sizeof(backlight_stack), backlight_thread_name
IF_PRIO(, PRIORITY_SYSTEM));
tick_add_task(backlight_tick);
#ifdef SIMULATOR
/* do nothing */
#elif CONFIG_BACKLIGHT == BL_IRIVER_H100
or_l(0x00020000, &GPIO1_ENABLE);
or_l(0x00020000, &GPIO1_FUNCTION);
and_l(~0x00020000, &GPIO1_OUT); /* Start with the backlight ON */
#elif CONFIG_BACKLIGHT == BL_IRIVER_H300
or_l(0x00020000, &GPIO1_ENABLE);
or_l(0x00020000, &GPIO1_FUNCTION);
or_l(0x00020000, &GPIO1_OUT); /* Start with the backlight ON */
#elif CONFIG_BACKLIGHT == BL_PA14_LO || CONFIG_BACKLIGHT == BL_PA14_HI
PACR1 &= ~0x3000; /* Set PA14 (backlight control) to GPIO */
or_b(0x40, &PAIORH); /* ..and output */
#elif CONFIG_BACKLIGHT == BL_GMINI
P1CON |= 0x10; /* P1.4 C-MOS output mode */
#endif
backlight_on();
#ifdef HAVE_REMOTE_LCD
remote_backlight_on();
#endif
}
#ifdef X5_BACKLIGHT_SHUTDOWN
void x5_backlight_shutdown(void)
{
/* Turn on the screen and don't let anyone else mess with it. Called
from clean_shutdown in misc.c. */
queue_empty(&backlight_queue);
tick_remove_task(backlight_tick);
/* Next time the thread runs, if at all, it will just remove itself. */
queue_post(&backlight_queue, BACKLIGHT_QUIT, NULL);
__backlight_on();
}
#endif /* X5_BACKLIGHT_SHUTDOWN */
void backlight_on(void)
{
queue_remove_from_head(&backlight_queue, BACKLIGHT_ON);
queue_post(&backlight_queue, BACKLIGHT_ON, NULL);
}
void backlight_off(void)
{
queue_post(&backlight_queue, BACKLIGHT_OFF, NULL);
}
/* returns true when the backlight is on OR when it's set to always off */
bool is_backlight_on(void)
{
if (backlight_timer || backlight_get_current_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)
{
#ifdef CONFIG_CHARGING
if (charger_inserted()
#ifdef HAVE_USB_POWER
|| usb_powered()
#endif
)
return backlight_timeout_plugged;
else
return backlight_timeout;
#else
return backlight_timeout;
#endif
}
void backlight_set_timeout(int index)
{
if((unsigned)index >= sizeof(backlight_timeout_value))
/* if given a weird value, use default */
index = 6;
backlight_timeout = HZ * backlight_timeout_value[index];
backlight_update_state();
}
#ifdef CONFIG_CHARGING
void backlight_set_timeout_plugged(int index)
{
if((unsigned)index >= sizeof(backlight_timeout_value))
/* if given a weird value, use default */
index = 6;
backlight_timeout_plugged = HZ * backlight_timeout_value[index];
backlight_update_state();
}
#endif /* CONFIG_CHARGING */
#ifdef HAS_BUTTON_HOLD
/* Hold button change event handler. */
void backlight_hold_changed(bool hold_button)
{
/* Hold switch overrides all backlight behavior except when
set to "Normal" */
/* Queue or freeze */
if (hold_button && backlight_on_button_hold == 1)
backlight_off(); /* setting == Off */
else /* setting == On, Normal, no hold button, or anything else */
backlight_on();
}
void backlight_set_on_button_hold(int index)
{
if ((unsigned)index >= 3)
/* if given a weird value, use default */
index = 0;
if (index == backlight_on_button_hold)
return;
backlight_on_button_hold = index;
backlight_hold_changed(button_hold());
}
#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, NULL);
}
void remote_backlight_off(void)
{
queue_post(&backlight_queue, REMOTE_BACKLIGHT_OFF, NULL);
}
void remote_backlight_set_timeout(int index)
{
if((unsigned)index >= sizeof(backlight_timeout_value))
/* if given a weird value, use default */
index=6;
remote_backlight_timeout = HZ * backlight_timeout_value[index];
remote_backlight_update_state();
}
#ifdef CONFIG_CHARGING
void remote_backlight_set_timeout_plugged(int index)
{
if((unsigned)index >= sizeof(backlight_timeout_value))
/* if given a weird value, use default */
index=6;
remote_backlight_timeout_plugged = HZ * backlight_timeout_value[index];
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)
{
/* Hold switch overrides all backlight behavior except when
set to "Normal" */
/* Queue or freeze */
if (rc_hold_button && remote_backlight_on_button_hold == 1)
remote_backlight_off(); /* setting == Off */
else /* setting == On, Normal, no hold button, or anything else */
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;
if (index == remote_backlight_on_button_hold)
return;
remote_backlight_on_button_hold = index;
remote_backlight_hold_changed(remote_button_hold());
}
#endif /* HAS_REMOTE_BUTTON_HOLD */
/* return value in ticks; 0 means always on, <0 means always off */
int remote_backlight_get_current_timeout(void)
{
#ifdef CONFIG_CHARGING
if (charger_inserted()
#ifdef HAVE_USB_POWER
|| usb_powered()
#endif
)
return remote_backlight_timeout_plugged;
else
return remote_backlight_timeout;
#else
return remote_backlight_timeout;
#endif
}
/* 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_get_current_timeout() <= 0)
return true;
else
return false;
}
#endif /* HAVE_REMOTE_LCD */
#else /* !defined(CONFIG_BACKLIGHT) || defined(BOOTLOADER)
-- no backlight, empty dummy functions */
#if defined(BOOTLOADER) && defined(CONFIG_BACKLIGHT)
void backlight_init(void)
{
#ifdef IRIVER_H300_SERIES
or_l(0x00020000, &GPIO1_OUT);
or_l(0x00020000, &GPIO1_ENABLE);
or_l(0x00020000, &GPIO1_FUNCTION);
#endif
}
#endif
void backlight_on(void) {}
void backlight_off(void) {}
void backlight_set_timeout(int index) {(void)index;}
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 index) {(void)index;}
bool is_remote_backlight_on(void) {return true;}
#endif
#endif /* defined(CONFIG_BACKLIGHT) && !defined(BOOTLOADER) */
/* TODO: Move low level code to target/ tree. Create
__backlight_set_brightness and call from here. */
#ifdef HAVE_BACKLIGHT_BRIGHTNESS
#if defined(IRIVER_H300_SERIES) || defined(IAUDIO_X5)
void backlight_set_brightness(int val)
{
#ifndef SIMULATOR
/* set brightness by changing the PWM
* accepts 0..15 but note that 0 and 1 give a black display on H300!
* 0 is black on the X5.
*/
/* disable IRQs while bitbanging */
int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
/* Clamp setting to range */
if(val<MIN_BRIGHTNESS_SETTING)
val=MIN_BRIGHTNESS_SETTING;
else if(val>MAX_BRIGHTNESS_SETTING)
val=MAX_BRIGHTNESS_SETTING;
pcf50606_write(0x35, (val << 1) | 0x01); /* 512Hz, Enable PWM */
/* enable IRQs again */
set_irq_level(old_irq_level);
#else
val=0;
#endif
}
#endif
#endif /* HAVE_BACKLIGHT_BRIGHTNESS */
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