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rockbox/firmware/backlight.c
Thom Johansen 3c7278f405 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
2006-03-19 17:42:58 +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 "timer.h"
#include "backlight.h"
#ifdef HAVE_BACKLIGHT_BRIGHTNESS
#include "pcf50606.h" /* iRiver brightness */
#endif
#if (CONFIG_BACKLIGHT == BL_IRIVER_H300) || (CONFIG_BACKLIGHT == BL_IPOD3G)
#include "lcd.h" /* for lcd_enable() */
#endif
#ifdef HAVE_REMOTE_LCD
#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] =
{
-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
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 = 5*HZ;
#ifdef HAVE_CHARGING
static int backlight_timeout_plugged = 5*HZ;
#endif
#ifdef HAVE_REMOTE_LCD
static int remote_backlight_timer;
static int remote_backlight_timeout = 5*HZ;
#ifdef HAVE_CHARGING
static int remote_backlight_timeout_plugged = 5*HZ;
#endif
#endif
#if defined(HAVE_BACKLIGHT_PWM_FADING) && !defined(SIMULATOR)
/* backlight fading */
#define BL_PWM_INTERVAL 5000 /* Cycle interval in <20>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(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, 1, 0, backlight_isr))
{
#ifdef CPU_COLDFIRE
/* Prevent cpu frequency changes while dimming. */
cpu_boost(true);
#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
}
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_REMOTE_LCD
static void __remote_backlight_on(void)
{
#ifdef SIMULATOR
sim_remote_backlight(100);
#elif defined(IRIVER_H300_SERIES)
and_l(~0x00000002, &GPIO1_OUT);
#else
and_l(~0x00000800, &GPIO_OUT);
#endif
}
static void __remote_backlight_off(void)
{
#ifdef SIMULATOR
sim_remote_backlight(0);
#elif defined(IRIVER_H300_SERIES)
or_l(0x00000002, &GPIO1_OUT);
#else
or_l(0x00000800, &GPIO_OUT);
#endif
}
#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:
#ifdef HAVE_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 */
__remote_backlight_off();
}
else
{
__remote_backlight_on();
}
break;
case REMOTE_BACKLIGHT_OFF:
__remote_backlight_off();
break;
#endif /* HAVE_REMOTE_LCD */
case BACKLIGHT_ON:
#ifdef HAVE_CHARGING
if (charger_inserted()
#ifdef HAVE_USB_POWER
|| usb_powered()
#endif
)
backlight_timer = backlight_timeout_plugged;
else
#endif
backlight_timer = backlight_timeout;
if (backlight_timer < 0) /* Backlight == OFF in the setting? */
{
backlight_timer = 0; /* Disable the timeout */
_backlight_off();
}
else
{
_backlight_on();
}
break;
case BACKLIGHT_OFF:
_backlight_off();
break;
#if defined(HAVE_BACKLIGHT_PWM_FADING) && defined(CPU_COLDFIRE) \
&& !defined(SIMULATOR)
case BACKLIGHT_UNBOOST_CPU:
cpu_boost(false);
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;
}
}
}
static void backlight_tick(void)
{
#ifdef HAVE_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 /* HAVE_CHARGING */
if(backlight_timer)
{
backlight_timer--;
if(backlight_timer == 0)
{
backlight_off();
}
}
#ifdef HAVE_REMOTE_LCD
if(remote_backlight_timer)
{
remote_backlight_timer--;
if(remote_backlight_timer == 0)
{
remote_backlight_off();
}
}
#endif
}
void backlight_init(void)
{
queue_init(&backlight_queue);
create_thread(backlight_thread, backlight_stack,
sizeof(backlight_stack), backlight_thread_name);
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
}
void backlight_on(void)
{
queue_post(&backlight_queue, BACKLIGHT_ON, NULL);
}
void backlight_off(void)
{
queue_post(&backlight_queue, BACKLIGHT_OFF, NULL);
}
/* return value in ticks; 0 means always on, <0 means always off */
int backlight_get_current_timeout(void)
{
#ifdef HAVE_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 0 */
index=0;
backlight_timeout = HZ * backlight_timeout_value[index];
backlight_on();
}
#ifdef HAVE_CHARGING
void backlight_set_timeout_plugged(int index)
{
if((unsigned)index >= sizeof(backlight_timeout_value))
/* if given a weird value, use 0 */
index=0;
backlight_timeout_plugged = HZ * backlight_timeout_value[index];
backlight_on();
}
#endif
#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 0 */
index=0;
remote_backlight_timeout = HZ * backlight_timeout_value[index];
remote_backlight_on();
}
#ifdef HAVE_CHARGING
void remote_backlight_set_timeout_plugged(int index)
{
if((unsigned)index >= sizeof(backlight_timeout_value))
/* if given a weird value, use 0 */
index=0;
remote_backlight_timeout_plugged = HZ * backlight_timeout_value[index];
remote_backlight_on();
}
#endif
#endif /* HAVE_REMOTE_LCD */
#else /* 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;}
#ifdef HAVE_REMOTE_LCD
void remote_backlight_on(void) {}
void remote_backlight_off(void) {}
void remote_backlight_set_timeout(int index) {(void)index;}
#endif
#endif /* #ifdef CONFIG_BACKLIGHT */
#ifdef HAVE_BACKLIGHT_BRIGHTNESS
#ifdef IRIVER_H300_SERIES
void backlight_set_brightness(int val)
{
/* set H300 brightness by changing the PWM
accepts 0..15 but note that 0 and 1 give a black display! */
val &= 0x0F;
if(val<MIN_BRIGHTNESS_SETTING)
val=MIN_BRIGHTNESS_SETTING;
/* shift one bit left */
val <<= 1;
/* enable PWM */
val |= 0x01;
/* disable IRQs while bitbanging */
int old_irq_level = set_irq_level(HIGHEST_IRQ_LEVEL);
pcf50606_write(0x35, val);
/* enable IRQs again */
set_irq_level(old_irq_level);
}
#endif
#endif
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