powermgmt.c

编译后直接运行的ＭＰ３播放器全部Ｃ语言源代码 一个包含FAT文件系统、系统引导 Boot、FLASH Driver等内容的

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id: powermgmt.c,v 1.45 2004/02/05 13:44:03 linusnielsen Exp $
 *
 * Copyright (C) 2002 by Heikki Hannikainen, Uwe Freese
 *
 * 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 "sh7034.h"
#include "kernel.h"
#include "thread.h"
#include "system.h"
#include "debug.h"
#include "panic.h"
#include "adc.h"
#include "string.h"
#include "sprintf.h"
#include "ata.h"
#include "power.h"
#include "button.h"
#include "ata.h"
#include "mpeg.h"
#include "usb.h"
#include "powermgmt.h"
#include "backlight.h"
#ifdef HAVE_FMRADIO
#include "fmradio.h"
#endif

#ifdef SIMULATOR

int battery_level(void)
{
    return 75;
}

int battery_time(void)
{
    return 500;
}

bool battery_level_safe(void)
{
    return battery_level() >= 10;
}

void set_poweroff_timeout(int timeout)
{
    (void)timeout;
}

void set_battery_capacity(int capacity)
{
  (void)capacity;
}

void set_car_adapter_mode(bool setting)
{
    (void)setting;
}

#else /* not SIMULATOR */

int battery_capacity = 1500;   /* only a default value */
int battery_level_cached = -1; /* battery level of this minute, updated once
                                  per minute */
static bool car_adapter_mode_enabled = false;

static int poweroff_idle_timeout_value[15] =
{
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 30, 45, 60
};

static int percent_to_volt_decharge[11] =
/* voltages (centivolt) of 0%, 10%, ... 100% when charging disabled */
{
#ifdef HAVE_LIION
    /* measured values */
    260, 285, 295, 303, 311, 320, 330, 345, 360, 380, 400
#else /* NiMH */
    /* original values were taken directly after charging, but it should show
       100% after turning off the device for some hours, too */
    450, 481, 491, 497, 503, 507, 512, 514, 517, 525, 540 /* orig. values:
                                                             ...,528,560 */
#endif
};

void set_battery_capacity(int capacity)
{
    battery_capacity = capacity;
    if (battery_capacity > BATTERY_CAPACITY_MAX)
        battery_capacity = BATTERY_CAPACITY_MAX;
    if (battery_capacity < 1500)
        battery_capacity = 1500;
}

#if defined(HAVE_CHARGE_CTRL) || defined(HAVE_LIION)
int charge_state = 0;                          /* at the beginning, the
                                                  charger does nothing */
#endif

#ifdef HAVE_CHARGE_CTRL

char power_message[POWER_MESSAGE_LEN] = "";    /* message that's shown in
                                                  debug menu */
char charge_restart_level = CHARGE_RESTART_HI; /* level at which charging
                                                  starts */
int powermgmt_last_cycle_startstop_min = 25;   /* how many minutes ago was the
                                                  charging started or
                                                  stopped? */
int powermgmt_last_cycle_level = 0;            /* which level had the
                                                  batteries at this time? */
bool trickle_charge_enabled = true;
int trickle_sec = 0;                           /* how many seconds should the
                                                  charger be enabled per
                                                  minute for trickle
                                                  charging? */
static int percent_to_volt_charge[11] = /* voltages (centivolt) of 0%, 10%,
                                           ... 100% when charging enabled */
{
    /* values guessed, see
       http://www.seattlerobotics.org/encoder/200210/LiIon2.pdf until someone
       measures voltages over a charging cycle */
    476, 544, 551, 556, 561, 564, 566, 576, 582, 584, 585 /* NiMH */
};

void enable_trickle_charge(bool on)
{
    trickle_charge_enabled = on;
}
#endif /* HAVE_CHARGE_CTRL */

static char power_stack[DEFAULT_STACK_SIZE];
static char power_thread_name[] = "power";

static int poweroff_timeout = 0;
static long last_charge_time = 0;
int powermgmt_est_runningtime_min = -1;

static bool sleeptimer_active = false;
static unsigned long sleeptimer_endtick;

unsigned short power_history[POWER_HISTORY_LEN];

int battery_time(void)
{
    return powermgmt_est_runningtime_min;
}

/* look into the percent_to_volt_* table and get a realistic battery level
       percentage */
int voltage_to_percent(int voltage, int* table)
{
    if (voltage <= table[0])
        return 0;
    else
        if (voltage >= table[10])
            return 100;
        else {    
            /* search nearest value */
            int i = 0;
            while ((i < 10) && (table[i+1] < voltage))
                i++;
            /* interpolate linear between the smaller and greater value */
            return i * 10 /* 10th */
                + (voltage - table[i]) *
                10 / (table[i+1] - table[i]); /* 1th */
        }
}

/* update battery level, called only once per minute */
void battery_level_update(void)
{
    int level = 0;
    int c = 0;
    int i;
    
    /* calculate maximum over last 3 minutes (skip empty samples) */
    for (i = 0; i < 3; i++)
        if (power_history[POWER_HISTORY_LEN-1-i] > c)
            c = power_history[POWER_HISTORY_LEN-1-i];
        
    if (c)
        level = c;
    else /* history was empty, get a fresh sample */
        level = (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) / 10000;

    if(level > BATTERY_LEVEL_FULL)
        level = BATTERY_LEVEL_FULL;

    if(level < BATTERY_LEVEL_EMPTY)
        level = BATTERY_LEVEL_EMPTY;

#ifdef HAVE_CHARGE_CTRL
    if (charge_state == 0) { /* decharge */
        level = voltage_to_percent(level, percent_to_volt_decharge);
    }
    else if (charge_state == 1) { /* charge */
        level = voltage_to_percent(level, percent_to_volt_charge);
    }
    else {/* in trickle charge, the battery is per definition 100% full */
        battery_level_cached = level = 100;
    }
#else
    level = voltage_to_percent(level, percent_to_volt_decharge);
    /* always use the decharge table */
#endif

    if (battery_level_cached == -1) { /* first run of this procedure */
        /* the battery voltage is usually a little lower directly after
           turning on, because the disk was used heavily raise it by 5 % */
        battery_level_cached = (level > 95) ? 100 : level + 5;
    }
    else {
        /* the level is allowed to be -1 of the last value when usb not
           connected and to be -3 of the last value when usb is connected */
        if (usb_inserted()) {
            if (level < battery_level_cached - 3)
                level = battery_level_cached - 3;
        }
        else {
            if (level < battery_level_cached - 1)
                level = battery_level_cached - 1;
        }
        battery_level_cached = level;
    }
}

/* Returns battery level in percent */
int battery_level(void)
{
#ifdef HAVE_CHARGE_CTRL
    if ((charge_state==1) && (battery_level_cached==100))
        return 99;
#endif
    return battery_level_cached;
}

/* Tells if the battery level is safe for disk writes */
bool battery_level_safe(void)
{
    /* I'm pretty sure we don't want an average over a long time here */
    if (power_history[POWER_HISTORY_LEN-1])
        return power_history[POWER_HISTORY_LEN-1] > BATTERY_LEVEL_DANGEROUS;
    else
        return adc_read(ADC_UNREG_POWER) > (BATTERY_LEVEL_DANGEROUS * 10000) /
            BATTERY_SCALE_FACTOR;
}

void set_poweroff_timeout(int timeout)
{
    poweroff_timeout = timeout;
}

void set_sleep_timer(int seconds)
{
    if(seconds) {
        sleeptimer_active = true;
        sleeptimer_endtick = current_tick + seconds * HZ;
    }
    else {
        sleeptimer_active = false;
        sleeptimer_endtick = 0;
    }
}

int get_sleep_timer(void)