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rockbox/firmware/backlight.c
Miika Pekkarinen 2bfd2585a9 Initial support for iriver backlight dimming. Unfortunately dimming 
remote control's EL-backlight is not possible.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6747 a1c6a512-1295-4272-9138-f99709370657
2005-06-18 12:53:57 +00:00

502 lines
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C
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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"
#ifdef HAVE_REMOTE_LCD
#include "lcd-remote.h"
#endif
#ifdef CONFIG_BACKLIGHT
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
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 bool charger_was_inserted = 0;
static bool backlight_on_when_charging = 0;
static int backlight_timer;
static unsigned int backlight_timeout = 5;
#ifdef HAVE_REMOTE_LCD
static int remote_backlight_timer;
static unsigned int remote_backlight_timeout = 5;
#endif
#if CONFIG_BACKLIGHT == BL_IRIVER
#define BL_PWM_COUNT 100
/* Cycle interval in ms */
#define BL_PWM_INTERVAL 5000
#define BL_PWM_INTERVAL_IDLE 500000
#define BL_DIM_SPEED 4
#define __backlight_on __backlight_fade_in
#define __backlight_off __backlight_fade_out
#define DIM_STATE_START 0
#define DIM_STATE_MAIN 1
#define DIM_STATE_REMOTE 2
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;
/* Unfortunately we can't dim H1xx remote lcd :/ */
#ifdef HAVE_REMOTE_LCD_DIMMABLE
#define lcd_remote_backlight_on __backlight_fade_remote_in
#define lcd_remote_backlight_off __backlight_fade_remote_out
static int bl_dim_remote_current = BL_PWM_COUNT;
static int bl_dim_remote_target = BL_PWM_COUNT;
static int bl_pwm_remote_counter = 0;
static bool bl_dim_next_interval;
#endif
static int bl_dim_state = 0;
void backlight_start_timer(void)
{
unsigned int count;
if (bl_timer_active)
return ;
count = 1;
bl_timer_active = true;
/* We are using timer 1 */
TRR1 = count; /* The reference count */
TCN1 = 0; /* reset the timer */
TMR1 = 0x011d; /* prescaler=2, restart, CLK/16, enabled */
TER1 = 0xff; /* Clear all events */
/* ICR2 (Timer2) */
ICR0 = (ICR0 & 0xffff00ff) | 0x00009000; /* Interrupt on level 4.0 */
IMR &= ~(1<<10);
}
void TIMER1(void) __attribute__ ((interrupt_handler));
void TIMER1(void)
{
int timer_period;
#ifdef HAVE_REMOTE_LCD_DIMMABLE
int new_timer_period;
#endif
timer_period = FREQ/20000 * BL_PWM_INTERVAL / 100 / 32;
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) {
GPIO1_OUT &= ~0x00020000;
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)
GPIO1_OUT &= ~0x00020000;
else
GPIO1_OUT |= 0x00020000;
}
#ifdef HAVE_REMOTE_LCD_DIMMABLE
bl_dim_next_interval = 0;
bl_pwm_remote_counter = 0;
if (bl_dim_remote_current > 0 &&
bl_dim_remote_current < BL_PWM_COUNT) {
GPIO_OUT &= ~0x00000800;
bl_pwm_remote_counter = bl_dim_remote_current;
if (bl_dim_state == DIM_STATE_START) {
timer_period = timer_period * bl_pwm_remote_counter
/ BL_PWM_COUNT;
bl_dim_state = DIM_STATE_REMOTE;
break ;
}
new_timer_period = timer_period * bl_pwm_remote_counter
/ BL_PWM_COUNT;
if (new_timer_period < timer_period) {
bl_dim_next_interval = timer_period - new_timer_period;
timer_period = new_timer_period;
bl_dim_state = DIM_STATE_REMOTE;
} else {
bl_dim_next_interval = new_timer_period - timer_period;
}
} else {
if (bl_dim_remote_current)
GPIO_OUT &= ~0x00000800;
else
GPIO_OUT |= 0x00000800;
}
#endif
break ;
/* Dim main screen */
case DIM_STATE_MAIN:
GPIO1_OUT |= 0x00020000;
#ifdef HAVE_REMOTE_LCD_DIMMABLE
if (bl_dim_next_interval) {
timer_period = bl_dim_next_interval;
bl_dim_next_interval = 0;
bl_dim_state = DIM_STATE_REMOTE;
break ;
}
#endif
bl_dim_state = DIM_STATE_START;
timer_period = timer_period * (BL_PWM_COUNT - bl_pwm_counter) / BL_PWM_COUNT;
break ;
#ifdef HAVE_REMOTE_LCD_DIMMABLE
/* Dim remote lcd */
case DIM_STATE_REMOTE:
GPIO_OUT |= 0x00000800;
if (bl_dim_next_interval) {
timer_period = bl_dim_next_interval;
bl_dim_next_interval = 0;
bl_dim_state = DIM_STATE_MAIN;
break ;
}
bl_dim_state = DIM_STATE_START;
timer_period = timer_period * (BL_PWM_COUNT - bl_pwm_remote_counter) / BL_PWM_COUNT;
break ;
#endif
}
if (bl_cycle_counter >= BL_DIM_SPEED) {
bool idle = true;
if (bl_dim_target > bl_dim_current) {
bl_dim_current++;
idle = false;
}
else if (bl_dim_target < bl_dim_current) {
bl_dim_current--;
idle = false;
}
#ifdef HAVE_REMOTE_LCD_DIMMABLE
if (bl_dim_remote_target > bl_dim_remote_current) {
bl_dim_remote_current++;
idle = false;
}
else if (bl_dim_remote_target < bl_dim_remote_current) {
bl_dim_remote_current--;
idle = false;
}
#endif
bl_cycle_counter = 0;
/* Save CPU & battery when idle, stop timer */
if (idle) {
bl_timer_active = false;
TMR1 = 0;
}
}
TRR1 = timer_period;
TCN1 = 0;
TER1 = 0xff; /* Clear all events */
}
static void __backlight_dim(int value)
{
bl_dim_target = value;
backlight_start_timer();
}
static void __backlight_fade_in(void)
{
__backlight_dim(BL_PWM_COUNT);
}
static void __backlight_fade_out(void)
{
__backlight_dim(0);
}
#ifdef HAVE_REMOTE_LCD_DIMMABLE
static void __backlight_dim_remote(int value)
{
bl_dim_remote_target = value;
}
static void __backlight_fade_remote_in(void)
{
__backlight_dim_remote(BL_PWM_COUNT);
}
static void __backlight_fade_remote_out(void)
{
__backlight_dim_remote(0);
}
#endif
#else
static void __backlight_off(void)
{
#if CONFIG_BACKLIGHT == BL_IRIVER
GPIO1_OUT |= 0x00020000;
#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;
#endif
}
static void __backlight_on(void)
{
#if CONFIG_BACKLIGHT == BL_IRIVER
GPIO1_OUT &= ~0x00020000;
#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;
#endif
}
#endif
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_timer =
HZ*backlight_timeout_value[remote_backlight_timeout];
/* Backlight == OFF in the setting? */
if(remote_backlight_timer < 0)
{
remote_backlight_timer = 0; /* Disable the timeout */
lcd_remote_backlight_off();
}
else
{
lcd_remote_backlight_on();
}
break;
case REMOTE_BACKLIGHT_OFF:
lcd_remote_backlight_off();
break;
#endif
case BACKLIGHT_ON:
if( backlight_on_when_charging && charger_inserted() )
{
/* Forcing to zero keeps the lights on */
backlight_timer = 0;
}
else
{
backlight_timer = HZ*backlight_timeout_value[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;
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;
}
}
}
void backlight_on(void)
{
queue_post(&backlight_queue, BACKLIGHT_ON, NULL);
}
void backlight_off(void)
{
queue_post(&backlight_queue, BACKLIGHT_OFF, NULL);
}
#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 = index; /* index in the backlight_timeout_value table */
remote_backlight_on();
}
#endif
int backlight_get_timeout(void)
{
return backlight_timeout;
}
void backlight_set_timeout(int index)
{
if((unsigned)index >= sizeof(backlight_timeout_value))
/* if given a weird value, use 0 */
index=0;
backlight_timeout = index; /* index in the backlight_timeout_value table */
backlight_on();
}
#ifdef HAVE_CHARGE_CTRL
bool backlight_get_on_when_charging(void)
{
return backlight_on_when_charging;
}
#endif
void backlight_set_on_when_charging(bool yesno)
{
backlight_on_when_charging = yesno;
backlight_on();
}
void backlight_tick(void)
{
bool charger_is_inserted = charger_inserted();
if( backlight_on_when_charging &&
(charger_was_inserted != charger_is_inserted) )
{
backlight_on();
}
charger_was_inserted = charger_is_inserted;
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);
#if CONFIG_BACKLIGHT == BL_IRIVER
GPIO1_ENABLE |= 0x00020000;
GPIO1_FUNCTION |= 0x00020000;
#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
}
#else /* no backlight, empty dummy functions */
void backlight_init(void) {}
void backlight_on(void) {}
void backlight_off(void) {}
void backlight_tick(void) {}
int backlight_get_timeout(void) {return 0;}
void backlight_set_timeout(int index) {(void)index;}
void backlight_set_on_when_charging(bool yesno) {(void)yesno;}
#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 */
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