firmware/powermgmt.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Heikki Hannikainen, Uwe Freese
  11  * Revisions copyright (C) 2005 by Gerald Van Baren
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22 #include "config.h"
  23 #include "system.h"
  24 #include "kernel.h"
  25 #include "thread.h"
  26 #include "debug.h"
  27 #include "adc.h"
  28 #include "string.h"
  29 #include "storage.h"
  30 #include "power.h"
  31 #include "audio.h"
  32 #include "mp3_playback.h"
  33 #include "usb.h"
  34 #include "powermgmt.h"
  35 #include "backlight.h"
  36 #include "lcd.h"
  37 #include "rtc.h"
  38 #if CONFIG_TUNER
  39 #include "fmradio.h"
  40 #endif
  41 #include "sound.h"
  42 #ifdef HAVE_LCD_BITMAP
  43 #include "font.h"
  44 #endif
  45 #include "logf.h"
  46 #include "lcd-remote.h"
  47 #ifdef SIMULATOR
  48 #include <time.h>
  49 #endif
  50
  51 #if (defined(IAUDIO_X5) || defined(IAUDIO_M5)) && !defined (SIMULATOR)
  52 #include "lcd-remote-target.h"
  53 #endif
  54 #if (defined(IAUDIO_X5) || defined(IAUDIO_M5) || defined(COWON_D2)) \
  55     && !defined (SIMULATOR)
  56 #include "pcf50606.h"
  57 #endif
  58
  59 /** Shared by sim **/
  60 int last_sent_battery_level = 100;
  61 /* battery level (0-100%) */
  62 int battery_percent = -1;
  63 void send_battery_level_event(void);
  64
  65 #if CONFIG_CHARGING
  66 /* State of the charger input as seen by the power thread */
  67 enum charger_input_state_type charger_input_state;
  68 /* Power inputs as seen by the power thread */
  69 unsigned int power_thread_inputs;
  70 #if CONFIG_CHARGING >= CHARGING_MONITOR
  71 /* Charging state (mode) as seen by the power thread */
  72 enum charge_state_type charge_state = DISCHARGING;
  73 #endif
  74 #endif /* CONFIG_CHARGING */
  75
  76 #ifndef SIMULATOR
  77 static int shutdown_timeout = 0;
  78 /*
  79  * Average battery voltage and charger voltage, filtered via a digital
  80  * exponential filter (aka. exponential moving average, scaled):
  81  * avgbat = y[n] = (N-1)/N*y[n-1] + x[n]. battery_millivolts = y[n] / N.
  82  */
  83 static unsigned int avgbat;
  84 /* filtered battery voltage, millivolts */
  85 static unsigned int battery_millivolts;
  86 /* default value, mAh */
  87 static int battery_capacity = BATTERY_CAPACITY_DEFAULT;
  88
  89
  90 #if BATTERY_TYPES_COUNT > 1
  91 static int battery_type = 0;
  92 #else
  93 #define battery_type 0
  94 #endif
  95
  96 /* Power history: power_history[0] is the newest sample */
  97 unsigned short power_history[POWER_HISTORY_LEN] = {0};
  98
  99 #if CONFIG_CPU == JZ4732 /* FIXME! */
 100 static char power_stack[DEFAULT_STACK_SIZE + POWERMGMT_DEBUG_STACK];
 101 #else
 102 static char power_stack[DEFAULT_STACK_SIZE/2 + POWERMGMT_DEBUG_STACK];
 103 #endif
 104 static const char power_thread_name[] = "power";
 105
 106 static int poweroff_timeout = 0;
 107 static int powermgmt_est_runningtime_min = -1;
 108
 109 static bool sleeptimer_active = false;
 110 static long sleeptimer_endtick;
 111
 112 static long last_event_tick;
 113
 114 static int voltage_to_battery_level(int battery_millivolts);
 115 static void battery_status_update(void);
 116
 117 #ifdef CURRENT_NORMAL   /*only used if we have run current*/
 118 static int runcurrent(void);
 119 #endif
 120
 121 void battery_read_info(int *voltage, int *level)
 122 {
 123     int millivolts = battery_adc_voltage();
 124
 125     if (voltage)
 126         *voltage = millivolts;
 127
 128     if (level)
 129         *level = voltage_to_battery_level(millivolts);
 130 }
 131
 132 void reset_poweroff_timer(void)
 133 {
 134     last_event_tick = current_tick;
 135 }
 136
 137 #if BATTERY_TYPES_COUNT > 1
 138 void set_battery_type(int type)
 139 {
 140     if (type != battery_type) {
 141         if ((unsigned)type >= BATTERY_TYPES_COUNT)
 142             type = 0;
 143
 144         battery_type = type;
 145         battery_status_update(); /* recalculate the battery status */
 146     }
 147 }
 148 #endif
 149
 150 void set_battery_capacity(int capacity)
 151 {
 152     if (capacity > BATTERY_CAPACITY_MAX)
 153         capacity = BATTERY_CAPACITY_MAX;
 154     if (capacity < BATTERY_CAPACITY_MIN)
 155         capacity = BATTERY_CAPACITY_MIN;
 156
 157     battery_capacity = capacity;
 158
 159     battery_status_update(); /* recalculate the battery status */
 160 }
 161
 162 int get_battery_capacity(void)
 163 {
 164     return battery_capacity;
 165 }
 166
 167 int battery_time(void)
 168 {
 169     return powermgmt_est_runningtime_min;
 170 }
 171
 172 /* Returns battery level in percent */
 173 int battery_level(void)
 174 {
 175 #ifdef HAVE_BATTERY_SWITCH
 176     if ((power_input_status() & POWER_INPUT_BATTERY) == 0)
 177         return -1;
 178 #endif
 179     return battery_percent;
 180 }
 181
 182 /* Returns filtered battery voltage [millivolts] */
 183 unsigned int battery_voltage(void)
 184 {
 185     return battery_millivolts;
 186 }
 187
 188 /* Tells if the battery level is safe for disk writes */
 189 bool battery_level_safe(void)
 190 {
 191 #if defined(NO_LOW_BATTERY_SHUTDOWN)
 192     return true;
 193 #elif defined(HAVE_BATTERY_SWITCH)
 194     /* Cannot rely upon the battery reading to be valid and the
 195      * device could be powered externally. */
 196     return input_millivolts() > battery_level_dangerous[battery_type];
 197 #else
 198     return battery_millivolts > battery_level_dangerous[battery_type];
 199 #endif
 200 }
 201
 202 void set_poweroff_timeout(int timeout)
 203 {
 204     poweroff_timeout = timeout;
 205 }
 206
 207 void set_sleep_timer(int seconds)
 208 {
 209     if (seconds) {
 210         sleeptimer_active  = true;
 211         sleeptimer_endtick = current_tick + seconds * HZ;
 212     }
 213     else {
 214         sleeptimer_active  = false;
 215         sleeptimer_endtick = 0;
 216     }
 217 }
 218
 219 int get_sleep_timer(void)
 220 {
 221     if (sleeptimer_active)
 222         return (sleeptimer_endtick - current_tick) / HZ;
 223     else
 224         return 0;
 225 }
 226
 227 /* look into the percent_to_volt_* table and get a realistic battery level */
 228 static int voltage_to_percent(int voltage, const short* table)
 229 {
 230     if (voltage <= table[0]) {
 231         return 0;
 232     }
 233     else if (voltage >= table[10]) {
 234         return 100;
 235     }
 236     else {
 237         /* search nearest value */
 238         int i = 0;
 239
 240         while (i < 10 && table[i+1] < voltage)
 241             i++;
 242
 243         /* interpolate linear between the smaller and greater value */
 244         /* Tens digit, 10% per entry,  ones digit: interpolated */
 245         return i*10 + (voltage - table[i])*10 / (table[i+1] - table[i]);
 246     }
 247 }
 248
 249 /* update battery level and estimated runtime, called once per minute or
 250  * when battery capacity / type settings are changed */
 251 static int voltage_to_battery_level(int battery_millivolts)
 252 {
 253     int level;
 254
 255 #if CONFIG_CHARGING >= CHARGING_MONITOR
 256     if (charging_state()) {
 257         /* battery level is defined to be < 100% until charging is finished */
 258         level = voltage_to_percent(battery_millivolts,
 259                                    percent_to_volt_charge);
 260         if (level > 99)
 261             level = 99;
 262     }
 263     else
 264 #endif /* CONFIG_CHARGING >= CHARGING_MONITOR */
 265     {
 266         /* DISCHARGING or error state */
 267         level = voltage_to_percent(battery_millivolts,
 268                                    percent_to_volt_discharge[battery_type]);
 269     }
 270
 271     return level;
 272 }
 273
 274 static void battery_status_update(void)
 275 {
 276     int level = voltage_to_battery_level(battery_millivolts);
 277
 278 #ifdef CURRENT_NORMAL  /*don't try to estimate run or charge
 279                         time without normal current defined*/
 280     /* calculate estimated remaining running time */
 281 #if CONFIG_CHARGING >= CHARGING_MONITOR
 282     if (charging_state()) {
 283         /* charging: remaining charging time */
 284         powermgmt_est_runningtime_min = (100 - level)*battery_capacity*60
 285                 / 100 / (CURRENT_MAX_CHG - runcurrent());
 286     }
 287     else
 288 #endif
 289
 290     /* discharging: remaining running time */
 291     if (battery_millivolts > percent_to_volt_discharge[0][0]) {
 292         /* linear extrapolation */
 293         powermgmt_est_runningtime_min = (level + battery_percent)*60
 294                 * battery_capacity / 200 / runcurrent();
 295     }
 296     if (0 > powermgmt_est_runningtime_min) {
 297         powermgmt_est_runningtime_min = 0;
 298     }
 299 #else
 300     powermgmt_est_runningtime_min=-1;
 301 #endif
 302
 303     battery_percent = level;
 304     send_battery_level_event();
 305 }
 306
 307 /*
 308  * We shut off in the following cases:
 309  * 1) The unit is idle, not playing music
 310  * 2) The unit is playing music, but is paused
 311  * 3) The battery level has reached shutdown limit
 312  *
 313  * We do not shut off in the following cases:
 314  * 1) The USB is connected
 315  * 2) The charger is connected
 316  * 3) We are recording, or recording with pause
 317  * 4) The radio is playing
 318  */
 319 static void handle_auto_poweroff(void)
 320 {
 321     long timeout = poweroff_timeout*60*HZ;
 322     int audio_stat = audio_status();
 323     long tick = current_tick;
 324
 325 #if CONFIG_CHARGING
 326     /*
 327      * Inhibit shutdown as long as the charger is plugged in.  If it is
 328      * unplugged, wait for a timeout period and then shut down.
 329      */
 330     if (charger_input_state == CHARGER || audio_stat == AUDIO_STATUS_PLAY) {
 331         last_event_tick = current_tick;
 332     }
 333 #endif
 334
 335     if (!shutdown_timeout && query_force_shutdown()) {
 336         backlight_on();
 337         sys_poweroff();
 338     }
 339
 340     if (timeout &&
 341 #if CONFIG_TUNER
 342         !(get_radio_status() & FMRADIO_PLAYING) &&
 343 #endif
 344         !usb_inserted() &&
 345         (audio_stat == 0 ||
 346          (audio_stat == (AUDIO_STATUS_PLAY | AUDIO_STATUS_PAUSE) &&
 347           !sleeptimer_active))) {
 348
 349         if (TIME_AFTER(tick, last_event_tick + timeout) &&
 350             TIME_AFTER(tick, storage_last_disk_activity() + timeout)) {
 351             sys_poweroff();
 352         }
 353     }
 354     else if (sleeptimer_active) {
 355         /* Handle sleeptimer */
 356         if (TIME_AFTER(tick, sleeptimer_endtick)) {
 357             audio_stop();
 358
 359             if (usb_inserted()
 360 #if CONFIG_CHARGING && !defined(HAVE_POWEROFF_WHILE_CHARGING)
 361 #if CONFIG_CHARGING >= CHARGING_MONITOR
 362                 || charging_state()
 363 #else
 364                 || charger_input_state != NO_CHARGER
 365 #endif
 366 #endif
 367             ) {
 368                 DEBUGF("Sleep timer timeout. Stopping...\n");
 369                 set_sleep_timer(0);
 370                 backlight_off(); /* Nighty, nighty... */
 371             }
 372             else {
 373                 DEBUGF("Sleep timer timeout. Shutting off...\n");
 374                 sys_poweroff();
 375             }
 376         }
 377     }
 378 }
 379
 380 #ifdef CURRENT_NORMAL /*check that we have a current defined in a config file*/
 381
 382 /*
 383  * Estimate how much current we are drawing just to run.
 384  */
 385 static int runcurrent(void)
 386 {
 387     int current = CURRENT_NORMAL;
 388
 389 #ifndef BOOTLOADER
 390     if (usb_inserted()
 391 #ifdef HAVE_USB_POWER
 392     #if (CURRENT_USB < CURRENT_NORMAL)
 393        || usb_powered()
 394     #else
 395        && !usb_powered()
 396     #endif
 397 #endif
 398     ) {
 399         current = CURRENT_USB;
 400     }
 401
 402 #if defined(HAVE_BACKLIGHT)
 403     if (backlight_get_current_timeout() == 0) /* LED always on */
 404         current += CURRENT_BACKLIGHT;
 405 #endif
 406
 407 #if defined(HAVE_RECORDING) && defined(CURRENT_RECORD)
 408     if (audio_status() & AUDIO_STATUS_RECORD)
 409         current += CURRENT_RECORD;
 410 #endif
 411
 412 #ifdef HAVE_SPDIF_POWER
 413     if (spdif_powered())
 414         current += CURRENT_SPDIF_OUT;
 415 #endif
 416
 417 #ifdef HAVE_REMOTE_LCD
 418     if (remote_detect())
 419         current += CURRENT_REMOTE;
 420 #endif
 421 #endif /* BOOTLOADER */
 422
 423     return current;
 424 }
 425
 426 #endif  /* CURRENT_NORMAL */
 427
 428 /* Check to see whether or not we've received an alarm in the last second */
 429 #ifdef HAVE_RTC_ALARM
 430 static void power_thread_rtc_process(void)
 431 {
 432     if (rtc_check_alarm_flag())
 433         rtc_enable_alarm(false);
 434 }
 435 #endif
 436
 437 /* switch off unit if battery level is too low for reliable operation */
 438 bool query_force_shutdown(void)
 439 {
 440 #if defined(NO_LOW_BATTERY_SHUTDOWN)
 441     return false;
 442 #elif defined(HAVE_BATTERY_SWITCH)
 443     /* Cannot rely upon the battery reading to be valid and the
 444      * device could be powered externally. */
 445     return input_millivolts() < battery_level_shutoff[battery_type];
 446 #else
 447     return battery_millivolts < battery_level_shutoff[battery_type];
 448 #endif
 449 }
 450
 451 #if defined(HAVE_BATTERY_SWITCH) || defined(HAVE_RESET_BATTERY_FILTER)
 452 /*
 453  * Reset the battery voltage filter to a new value and update the
 454  * status.
 455  */
 456 void reset_battery_filter(int millivolts)
 457 {
 458     avgbat = millivolts * BATT_AVE_SAMPLES;
 459     battery_millivolts = millivolts;
 460     battery_status_update();
 461 }
 462 #endif /* HAVE_BATTERY_SWITCH */
 463
 464 /** Generic charging algorithms for common charging types **/
 465 #if CONFIG_CHARGING == 0 || CONFIG_CHARGING == CHARGING_SIMPLE
 466 static inline void powermgmt_init_target(void)
 467 {
 468     /* Nothing to do */
 469 }
 470
 471 static inline void charging_algorithm_step(void)
 472 {
 473     /* Nothing to do */
 474 }
 475
 476 static inline void charging_algorithm_close(void)
 477 {
 478     /* Nothing to do */
 479 }
 480 #elif CONFIG_CHARGING == CHARGING_MONITOR
 481 /*
 482  * Monitor CHARGING/DISCHARGING state.
 483  */
 484 static inline void powermgmt_init_target(void)
 485 {
 486     /* Nothing to do */
 487 }
 488
 489 static inline void charging_algorithm_step(void)
 490 {
 491     switch (charger_input_state)
 492     {
 493     case CHARGER_PLUGGED:
 494     case CHARGER:
 495         if (charging_state()) {
 496             charge_state = CHARGING;
 497             break;
 498         }
 499     /* Fallthrough */
 500     case CHARGER_UNPLUGGED:
 501     case NO_CHARGER:
 502         charge_state = DISCHARGING;
 503         break;
 504     }
 505 }
 506
 507 static inline void charging_algorithm_close(void)
 508 {
 509     /* Nothing to do */
 510 }
 511 #endif /* CONFIG_CHARGING == * */
 512
 513 #if CONFIG_CHARGING
 514 /* Shortcut function calls - compatibility, simplicity. */
 515
 516 /* Returns true if any power input is capable of charging. */
 517 bool charger_inserted(void)
 518 {
 519     return power_thread_inputs & POWER_INPUT_CHARGER;
 520 }
 521
 522 /* Returns true if any power input is connected - charging-capable
 523  * or not. */
 524 bool power_input_present(void)
 525 {
 526     return power_thread_inputs & POWER_INPUT;
 527 }
 528
 529 /*
 530  * Detect charger inserted. Return true if the state is transistional.
 531  */
 532 static inline bool detect_charger(unsigned int pwr)
 533 {
 534     /*
 535      * Detect charger plugged/unplugged transitions.  On a plugged or
 536      * unplugged event, we return immediately, run once through the main
 537      * loop (including the subroutines), and end up back here where we
 538      * transition to the appropriate steady state charger on/off state.
 539      */
 540     if (pwr & POWER_INPUT_CHARGER) {
 541         switch (charger_input_state)
 542         {
 543         case NO_CHARGER:
 544         case CHARGER_UNPLUGGED:
 545             charger_input_state = CHARGER_PLUGGED;
 546             break;
 547
 548         case CHARGER_PLUGGED:
 549             queue_broadcast(SYS_CHARGER_CONNECTED, 0);
 550             last_sent_battery_level = 0;
 551             charger_input_state = CHARGER;
 552             break;
 553
 554         case CHARGER:
 555             /* Steady state */
 556             return false;
 557         }
 558     }
 559     else {    /* charger not inserted */
 560         switch (charger_input_state)
 561         {
 562         case NO_CHARGER:
 563             /* Steady state */
 564             return false;
 565
 566         case CHARGER_UNPLUGGED:
 567             queue_broadcast(SYS_CHARGER_DISCONNECTED, 0);
 568             last_sent_battery_level = 100;
 569             charger_input_state = NO_CHARGER;
 570             break;
 571
 572         case CHARGER_PLUGGED:
 573         case CHARGER:
 574             charger_input_state = CHARGER_UNPLUGGED;
 575             break;
 576         }
 577     }
 578
 579     /* Transitional state */
 580     return true;
 581 }
 582 #endif /* CONFIG_CHARGING */
 583
 584 /*
 585  * Monitor the presence of a charger and perform critical frequent steps
 586  * such as running the battery voltage filter.
 587  */
 588 static inline void power_thread_step(void)
 589 {
 590     /* If the power off timeout expires, the main thread has failed
 591        to shut down the system, and we need to force a power off */
 592     if (shutdown_timeout) {
 593         shutdown_timeout -= POWER_THREAD_STEP_TICKS;
 594
 595         if (shutdown_timeout <= 0)
 596             power_off();
 597     }
 598
 599 #ifdef HAVE_RTC_ALARM
 600     power_thread_rtc_process();
 601 #endif
 602
 603     /*
 604      * Do a digital exponential filter.  We don't sample the battery if
 605      * the disk is spinning unless we are in USB mode (the disk will most
 606      * likely always be spinning in USB mode) or charging.
 607      */
 608     if (!storage_disk_is_active() || usb_inserted()
 609 #if CONFIG_CHARGING >= CHARGING_MONITOR
 610             || charger_input_state == CHARGER
 611 #endif
 612     ) {
 613         avgbat += battery_adc_voltage() - avgbat / BATT_AVE_SAMPLES;
 614         /*
 615          * battery_millivolts is the millivolt-scaled filtered battery value.
 616          */
 617         battery_millivolts = avgbat / BATT_AVE_SAMPLES;
 618
 619         /* update battery status every time an update is available */
 620         battery_status_update();
 621     }
 622     else if (battery_percent < 8) {
 623         /*
 624          * If battery is low, observe voltage during disk activity.
 625          * Shut down if voltage drops below shutoff level and we are not
 626          * using NiMH or Alkaline batteries.
 627          */
 628         battery_millivolts = (battery_adc_voltage() +
 629                               battery_millivolts + 1) / 2;
 630
 631         /* update battery status every time an update is available */
 632         battery_status_update();
 633
 634         if (!shutdown_timeout && query_force_shutdown()) {
 635             sys_poweroff();
 636         }
 637         else {
 638             avgbat += battery_millivolts - avgbat / BATT_AVE_SAMPLES;
 639         }
 640     }
 641 } /* power_thread_step */
 642
 643 static void power_thread(void)
 644 {
 645     long next_power_hist;
 646
 647     /* Delay reading the first battery level */
 648 #ifdef MROBE_100
 649     while (battery_adc_voltage() > 4200) /* gives false readings initially */
 650 #endif
 651     {
 652         sleep(HZ/100);
 653     }
 654
 655 #if CONFIG_CHARGING
 656     /* Initialize power input status before calling other routines. */
 657     power_thread_inputs = power_input_status();
 658 #endif
 659
 660     /* initialize the voltages for the exponential filter */
 661     avgbat = battery_adc_voltage() + 15;
 662
 663 #ifdef HAVE_DISK_STORAGE /* this adjustment is only needed for HD based */
 664     /* The battery voltage is usually a little lower directly after
 665        turning on, because the disk was used heavily. Raise it by 5% */
 666 #if CONFIG_CHARGING
 667     if (!charger_inserted()) /* only if charger not connected */
 668 #endif
 669     {
 670         avgbat += (percent_to_volt_discharge[battery_type][6] -
 671                    percent_to_volt_discharge[battery_type][5]) / 2;
 672     }
 673 #endif /* HAVE_DISK_STORAGE */
 674
 675     avgbat = avgbat * BATT_AVE_SAMPLES;
 676     battery_millivolts = avgbat / BATT_AVE_SAMPLES;
 677     power_history[0] = battery_millivolts;
 678
 679 #if CONFIG_CHARGING
 680     if (charger_inserted()) {
 681         battery_percent = voltage_to_percent(battery_millivolts,
 682                             percent_to_volt_charge);
 683     }
 684     else
 685 #endif
 686     {
 687         battery_percent = voltage_to_percent(battery_millivolts,
 688                             percent_to_volt_discharge[battery_type]);
 689         battery_percent += battery_percent < 100;
 690     }
 691
 692     powermgmt_init_target();
 693
 694     next_power_hist = current_tick + HZ*60;
 695
 696     while (1)
 697     {
 698 #if CONFIG_CHARGING
 699         unsigned int pwr = power_input_status();
 700 #ifdef HAVE_BATTERY_SWITCH
 701         if ((pwr ^ power_thread_inputs) & POWER_INPUT_BATTERY) {
 702             sleep(HZ/10);
 703             reset_battery_filter(battery_adc_voltage());
 704         }
 705 #endif
 706         power_thread_inputs = pwr;
 707
 708         if (!detect_charger(pwr))
 709 #endif /* CONFIG_CHARGING */
 710         {
 711             /* Steady state */
 712             sleep(POWER_THREAD_STEP_TICKS);
 713
 714             /* Do common power tasks */
 715             power_thread_step();
 716         }
 717
 718         /* Perform target tasks */
 719         charging_algorithm_step();
 720
 721         if (TIME_BEFORE(current_tick, next_power_hist))
 722             continue;
 723
 724         /* increment to ensure there is a record for every minute
 725          * rather than go forward from the current tick */
 726         next_power_hist += HZ*60;
 727
 728         /* rotate the power history */
 729         memmove(&power_history[1], &power_history[0],
 730                 sizeof(power_history) - sizeof(power_history[0]));
 731
 732         /* insert new value at the start, in millivolts 8-) */
 733         power_history[0] = battery_millivolts;
 734
 735         handle_auto_poweroff();
 736     }
 737 } /* power_thread */
 738
 739 void powermgmt_init(void)
 740 {
 741     create_thread(power_thread, power_stack, sizeof(power_stack), 0,
 742                   power_thread_name IF_PRIO(, PRIORITY_SYSTEM)
 743                   IF_COP(, CPU));
 744 }
 745
 746 /* Various hardware housekeeping tasks relating to shutting down the player */
 747 void shutdown_hw(void)
 748 {
 749     charging_algorithm_close();
 750     audio_stop();
 751
 752     if (battery_level_safe()) { /* do not save on critical battery */
 753 #ifdef HAVE_LCD_BITMAP
 754       glyph_cache_save(NULL);
 755 #endif
 756
 757 /* Commit pending writes if needed. Even though we don't do write caching,
 758    things like flash translation layers may need this to commit scattered
 759    pages to there final locations. So far only used for iPod Nano 2G. */
 760 #ifdef HAVE_STORAGE_FLUSH
 761         storage_flush();
 762 #endif
 763
 764         if (storage_disk_is_active())
 765             storage_spindown(1);
 766     }
 767
 768     while (storage_disk_is_active())
 769         sleep(HZ/10);
 770
 771 #if CONFIG_CODEC == SWCODEC
 772     audiohw_close();
 773 #else
 774     mp3_shutdown();
 775 #endif
 776
 777     /* If HD is still active we try to wait for spindown, otherwise the
 778        shutdown_timeout in power_thread_step will force a power off */
 779     while (storage_disk_is_active())
 780         sleep(HZ/10);
 781
 782 #ifndef HAVE_LCD_COLOR
 783     lcd_set_contrast(0);
 784 #endif
 785 #ifdef HAVE_REMOTE_LCD
 786     lcd_remote_set_contrast(0);
 787 #endif
 788 #ifdef HAVE_LCD_SHUTDOWN
 789     lcd_shutdown();
 790 #endif
 791
 792     /* Small delay to make sure all HW gets time to flush. Especially
 793        eeprom chips are quite slow and might be still writing the last
 794        byte. */
 795     sleep(HZ/4);
 796     power_off();
 797 }
 798
 799 void sys_poweroff(void)
 800 {
 801 #ifndef BOOTLOADER
 802     logf("sys_poweroff()");
 803     /* If the main thread fails to shut down the system, we will force a
 804        power off after an 20 second timeout - 28 seconds if recording */
 805     if (shutdown_timeout == 0) {
 806 #if defined(IAUDIO_X5) || defined(IAUDIO_M5) || defined(COWON_D2)
 807         pcf50606_reset_timeout(); /* Reset timer on first attempt only */
 808 #endif
 809 #ifdef HAVE_RECORDING
 810         if (audio_status() & AUDIO_STATUS_RECORD)
 811             shutdown_timeout += HZ*8;
 812 #endif
 813 #ifdef IPOD_NANO2G
 814         /* The FTL alone may take half a minute to shut down cleanly. */
 815         shutdown_timeout += HZ*60;
 816 #else
 817         shutdown_timeout += HZ*20;
 818 #endif
 819     }
 820
 821     queue_broadcast(SYS_POWEROFF, 0);
 822 #endif /* BOOTLOADER */
 823 }
 824
 825 void cancel_shutdown(void)
 826 {
 827     logf("cancel_shutdown()");
 828
 829 #if defined(IAUDIO_X5) || defined(IAUDIO_M5) || defined(COWON_D2)
 830     /* TODO: Move some things to target/ tree */
 831     if (shutdown_timeout)
 832         pcf50606_reset_timeout();
 833 #endif
 834
 835     shutdown_timeout = 0;
 836 }
 837 #endif /* SIMULATOR */
 838
 839 /* Send system battery level update events on reaching certain significant
 840    levels. This must be called after battery_percent has been updated. */
 841 void send_battery_level_event(void)
 842 {
 843     static const int levels[] = { 5, 15, 30, 50, 0 };
 844     const int *level = levels;
 845
 846     while (*level)
 847     {
 848         if (battery_percent <= *level && last_sent_battery_level > *level) {
 849             last_sent_battery_level = *level;
 850             queue_broadcast(SYS_BATTERY_UPDATE, last_sent_battery_level);
 851             break;
 852         }
 853
 854         level++;
 855     }
 856 }