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  * All files in this archive are subject to the GNU General Public License.
  14  * See the file COPYING in the source tree root for full license agreement.
  15  *
  16  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  17  * KIND, either express or implied.
  18  *
  19  ****************************************************************************/
  20 #include "config.h"
  21 #include "cpu.h"
  22 #include "kernel.h"
  23 #include "thread.h"
  24 #include "system.h"
  25 #include "debug.h"
  26 #include "panic.h"
  27 #include "adc.h"
  28 #include "string.h"
  29 #include "sprintf.h"
  30 #include "ata.h"
  31 #include "power.h"
  32 #include "button.h"
  33 #include "audio.h"
  34 #include "mp3_playback.h"
  35 #include "usb.h"
  36 #include "powermgmt.h"
  37 #include "backlight.h"
  38 #include "lcd.h"
  39 #include "rtc.h"
  40 #if CONFIG_TUNER
  41 #include "fmradio.h"
  42 #endif
  43 #include "sound.h"
  44 #ifdef HAVE_LCD_BITMAP
  45 #include "font.h"
  46 #endif
  47 #if defined(HAVE_RECORDING) && (CONFIG_CODEC == SWCODEC)
  48 #include "pcm_record.h"
  49 #endif
  50 #include "logf.h"
  51 #include "lcd-remote.h"
  52 #ifdef SIMULATOR
  53 #include <time.h>
  54 #endif
  55
  56 #if (defined(IAUDIO_X5) || defined(IAUDIO_M5)) && !defined (SIMULATOR)
  57 #include "pcf50606.h"
  58 #include "lcd-remote-target.h"
  59 #endif
  60
  61 /*
  62  * Define DEBUG_FILE to create a csv (spreadsheet) with battery information
  63  * in it (one sample per minute).  This is only for very low level debug.
  64  */
  65 #undef  DEBUG_FILE
  66 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
  67 #include "file.h"
  68 #define DEBUG_FILE_NAME   "/powermgmt.csv"
  69 #define DEBUG_MESSAGE_LEN 133
  70 static char debug_message[DEBUG_MESSAGE_LEN];
  71 #define DEBUG_STACK ((0x1000)/sizeof(long))
  72 static int fd;          /* write debug information to this file */
  73 static int wrcount;
  74 #else
  75 #define DEBUG_STACK 0
  76 #endif
  77
  78 static int shutdown_timeout = 0;
  79 #if CONFIG_CHARGING >= CHARGING_MONITOR
  80 charge_state_type charge_state;     /* charging mode */
  81 #endif
  82
  83 #if CONFIG_CHARGING
  84 charger_input_state_type charger_input_state IDATA_ATTR;
  85 #endif
  86
  87 #ifdef SIMULATOR /***********************************************************/
  88
  89 #define BATT_MINMVOLT   2500            /* minimum millivolts of battery */
  90 #define BATT_MAXMVOLT   4500            /* maximum millivolts of battery */
  91 #define BATT_MAXRUNTIME (10 * 60)       /* maximum runtime with full battery in minutes */
  92
  93 static unsigned int batt_millivolts = (unsigned int)BATT_MAXMVOLT;
  94 static int batt_level = 100;            /* battery capacity level in percent */
  95 static int batt_time = BATT_MAXRUNTIME; /* estimated remaining time in minutes */
  96 static time_t last_change = 0;
  97
  98 static void battery_status_update(void)
  99 {
 100     time_t          now;
 101
 102     time(&now);
 103     if (last_change < now) {
 104         last_change = now;
 105
 106         /* change the values: */
 107         batt_millivolts -= (unsigned int)(BATT_MAXMVOLT - BATT_MINMVOLT) / 101;
 108         if (batt_millivolts < (unsigned int)BATT_MINMVOLT)
 109             batt_millivolts = (unsigned int)BATT_MAXMVOLT;
 110
 111         batt_level = 100 * (batt_millivolts - BATT_MINMVOLT) / (BATT_MAXMVOLT - BATT_MINMVOLT);
 112         batt_time = batt_level * BATT_MAXRUNTIME / 100;
 113     }
 114 }
 115
 116 void battery_read_info(int *voltage, int *level)
 117 {
 118     battery_status_update();
 119
 120     if (voltage)
 121         *voltage = batt_millivolts;
 122
 123     if (level)
 124         *level = batt_level;
 125 }
 126
 127 unsigned int battery_voltage(void)
 128 {
 129     battery_status_update();
 130     return batt_millivolts;
 131 }
 132
 133 int battery_level(void)
 134 {
 135     battery_status_update();
 136     return batt_level;
 137 }
 138
 139 int battery_time(void)
 140 {
 141     battery_status_update();
 142     return batt_time;
 143 }
 144
 145 bool battery_level_safe(void)
 146 {
 147     return battery_level() >= 10;
 148 }
 149
 150 void set_poweroff_timeout(int timeout)
 151 {
 152     (void)timeout;
 153 }
 154
 155 void set_battery_capacity(int capacity)
 156 {
 157   (void)capacity;
 158 }
 159
 160 #if BATTERY_TYPES_COUNT > 1
 161 void set_battery_type(int type)
 162 {
 163     (void)type;
 164 }
 165 #endif
 166
 167 void reset_poweroff_timer(void)
 168 {
 169 }
 170
 171 #else /* not SIMULATOR ******************************************************/
 172
 173 static const unsigned char poweroff_idle_timeout_value[15] =
 174 {
 175     0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 30, 45, 60
 176 };
 177
 178 #if CONFIG_CHARGING == CHARGING_CONTROL
 179 int long_delta;                     /* long term delta battery voltage */
 180 int short_delta;                    /* short term delta battery voltage */
 181 bool disk_activity_last_cycle = false;         /* flag set to aid charger time
 182                                                 * calculation */
 183 char power_message[POWER_MESSAGE_LEN] = "";    /* message that's shown in
 184                                                   debug menu */
 185                                                /* percentage at which charging
 186                                                   starts */
 187 int powermgmt_last_cycle_startstop_min = 0;    /* how many minutes ago was the
 188                                                   charging started or
 189                                                   stopped? */
 190 int powermgmt_last_cycle_level = 0;            /* which level had the
 191                                                   batteries at this time? */
 192 int trickle_sec = 0;                           /* how many seconds should the
 193                                                   charger be enabled per
 194                                                   minute for trickle
 195                                                   charging? */
 196 int pid_p = 0;                      /* PID proportional term */
 197 int pid_i = 0;                      /* PID integral term */
 198 #endif /* CONFIG_CHARGING == CHARGING_CONTROL */
 199
 200 /*
 201  * Average battery voltage and charger voltage, filtered via a digital
 202  * exponential filter.
 203  */
 204 static unsigned int avgbat;     /* average battery voltage (filtering) */
 205 static unsigned int battery_millivolts;/* filtered battery voltage, millivolts */
 206
 207 #ifdef HAVE_CHARGE_CTRL
 208 #define BATT_AVE_SAMPLES    32  /* filter constant / @ 2Hz sample rate */
 209 #else
 210 #define BATT_AVE_SAMPLES   128  /* slw filter constant for all others */
 211 #endif
 212
 213 /* battery level (0-100%) of this minute, updated once per minute */
 214 static int battery_percent  = -1;
 215 static int battery_capacity = BATTERY_CAPACITY_DEFAULT; /* default value, mAh */
 216 static int battery_type     = 0;
 217
 218 /* Power history: power_history[0] is the newest sample */
 219 unsigned short power_history[POWER_HISTORY_LEN];
 220
 221 static char power_stack[DEFAULT_STACK_SIZE/2 + DEBUG_STACK];
 222 static const char power_thread_name[] = "power";
 223
 224 static int poweroff_timeout = 0;
 225 static int powermgmt_est_runningtime_min = -1;
 226
 227 static bool sleeptimer_active = false;
 228 static long sleeptimer_endtick;
 229
 230 static long last_event_tick;
 231
 232 static int voltage_to_battery_level(int battery_millivolts);
 233 static void battery_status_update(void);
 234 static int runcurrent(void);
 235
 236 void battery_read_info(int *voltage, int *level)
 237 {
 238     int millivolts = battery_adc_voltage();
 239
 240     if (voltage)
 241         *voltage = millivolts;
 242
 243     if (level)
 244         *level = voltage_to_battery_level(millivolts);
 245 }
 246
 247 void reset_poweroff_timer(void)
 248 {
 249     last_event_tick = current_tick;
 250 }
 251
 252 #if BATTERY_TYPES_COUNT > 1
 253 void set_battery_type(int type)
 254 {
 255     if (type != battery_type) {
 256         battery_type = type;
 257         battery_status_update();     /* recalculate the battery status */
 258     }
 259 }
 260 #endif
 261
 262 void set_battery_capacity(int capacity)
 263 {
 264     battery_capacity = capacity;
 265     if (battery_capacity > BATTERY_CAPACITY_MAX)
 266         battery_capacity = BATTERY_CAPACITY_MAX;
 267     if (battery_capacity < BATTERY_CAPACITY_MIN)
 268         battery_capacity = BATTERY_CAPACITY_MIN;
 269     battery_status_update();     /* recalculate the battery status */
 270 }
 271
 272 int battery_time(void)
 273 {
 274     return powermgmt_est_runningtime_min;
 275 }
 276
 277 /* Returns battery level in percent */
 278 int battery_level(void)
 279 {
 280     return battery_percent;
 281 }
 282
 283 /* Returns filtered battery voltage [millivolts] */
 284 unsigned int battery_voltage(void)
 285 {
 286     return battery_millivolts;
 287 }
 288
 289 /* Tells if the battery level is safe for disk writes */
 290 bool battery_level_safe(void)
 291 {
 292     return battery_millivolts > battery_level_dangerous[battery_type];
 293 }
 294
 295 void set_poweroff_timeout(int timeout)
 296 {
 297     poweroff_timeout = timeout;
 298 }
 299
 300 void set_sleep_timer(int seconds)
 301 {
 302     if(seconds) {
 303         sleeptimer_active  = true;
 304         sleeptimer_endtick = current_tick + seconds * HZ;
 305     }
 306     else {
 307         sleeptimer_active  = false;
 308         sleeptimer_endtick = 0;
 309     }
 310 }
 311
 312 int get_sleep_timer(void)
 313 {
 314     if(sleeptimer_active)
 315         return (sleeptimer_endtick - current_tick) / HZ;
 316     else
 317         return 0;
 318 }
 319
 320 /* look into the percent_to_volt_* table and get a realistic battery level */
 321 static int voltage_to_percent(int voltage, const short* table)
 322 {
 323     if (voltage <= table[0])
 324         return 0;
 325     else
 326         if (voltage >= table[10])
 327             return 100;
 328         else {
 329             /* search nearest value */
 330             int i = 0;
 331             while ((i < 10) && (table[i+1] < voltage))
 332                 i++;
 333             /* interpolate linear between the smaller and greater value */
 334             return (i * 10) /* Tens digit, 10% per entry */
 335                 + (((voltage - table[i]) * 10)
 336                    / (table[i+1] - table[i])); /* Ones digit: interpolated */
 337         }
 338 }
 339
 340 /* update battery level and estimated runtime, called once per minute or
 341  * when battery capacity / type settings are changed */
 342 static int voltage_to_battery_level(int battery_millivolts)
 343 {
 344     int level;
 345
 346 #if defined(CONFIG_CHARGER) \
 347  && (defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES))
 348     /* Checking for iriver is a temporary kludge.
 349      * This code needs rework/unification */
 350     if (charger_input_state == NO_CHARGER) {
 351         /* discharging. calculate new battery level and average with last */
 352         level = voltage_to_percent(battery_millivolts,
 353                 percent_to_volt_discharge[battery_type]);
 354         if (level != (battery_percent - 1))
 355             level = (level + battery_percent + 1) / 2;
 356     }
 357     else if (charger_input_state == CHARGER_UNPLUGGED) {
 358         /* just unplugged. adjust filtered values */
 359         battery_millivolts -= percent_to_volt_charge[battery_percent/10] -
 360                               percent_to_volt_discharge[0][battery_percent/10];
 361         avgbat = battery_millivolts * 1000 * BATT_AVE_SAMPLES;
 362         level  = battery_percent;
 363     }
 364     else if (charger_input_state == CHARGER_PLUGGED) {
 365         /* just plugged in. adjust battery values */
 366         battery_millivolts += percent_to_volt_charge[battery_percent/10] -
 367                               percent_to_volt_discharge[0][battery_percent/10];
 368         avgbat = battery_millivolts * 1000 * BATT_AVE_SAMPLES;
 369         level  = MIN(12 * battery_percent / 10, 99);
 370     }
 371     else { /* charging. calculate new battery level */
 372         level = voltage_to_percent(battery_millivolts,
 373                 percent_to_volt_charge);
 374     }
 375 #elif CONFIG_CHARGING >= CHARGING_MONITOR
 376     if (charge_state == DISCHARGING) {
 377         level = voltage_to_percent(battery_millivolts,
 378                     percent_to_volt_discharge[battery_type]);
 379     }
 380     else if (charge_state == CHARGING) {
 381         /* battery level is defined to be < 100% until charging is finished */
 382         level = MIN(voltage_to_percent(battery_millivolts,
 383                     percent_to_volt_charge), 99);
 384     }
 385     else { /* in topoff/trickle charge, battery is by definition 100% full */
 386         level = 100;
 387     }
 388 #else
 389     /* always use the discharge table */
 390     level = voltage_to_percent(battery_millivolts,
 391                 percent_to_volt_discharge[battery_type]);
 392 #endif
 393
 394     return level;
 395 }
 396
 397 static void battery_status_update(void)
 398 {
 399     int level = voltage_to_battery_level(battery_millivolts);
 400
 401
 402     /* calculate estimated remaining running time */
 403     /* discharging: remaining running time */
 404     /* charging:    remaining charging time */
 405 #if CONFIG_CHARGING >= CHARGING_MONITOR
 406     if (charge_state == CHARGING) {
 407         powermgmt_est_runningtime_min = (100 - level) * battery_capacity * 60
 408                                       / 100 / (CURRENT_MAX_CHG - runcurrent());
 409     }
 410     else
 411 #elif CONFIG_CHARGING \
 412   && (defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES))
 413     /* Checking for iriver is a temporary kludge.
 414      * This code needs rework/unification */
 415     if (charger_inserted()) {
 416 #ifdef IRIVER_H300_SERIES
 417         /* H300_SERIES use CURRENT_MAX_CHG for basic charge time (80%)
 418          * plus 110 min top off charge time */
 419         powermgmt_est_runningtime_min = ((100-level) * battery_capacity * 80
 420                                          /100 / CURRENT_MAX_CHG) + 110;
 421 #else
 422         /* H100_SERIES scaled for 160 min basic charge time (80%) on
 423          * 1600 mAh battery plus 110 min top off charge time */
 424         powermgmt_est_runningtime_min = ((100 - level) * battery_capacity
 425                                          / 993) + 110;
 426 #endif
 427         level = (level * 80) / 100;
 428         if (level > 72) { /* > 91% */
 429             int i = POWER_HISTORY_LEN;
 430             int d = 1;
 431 #ifdef HAVE_CHARGE_STATE
 432             if (charge_state == DISCHARGING)
 433                 d = -2;
 434 #endif
 435             while ((i > 2) && (d > 0)) /* search zero or neg. delta */
 436                 d = power_history[0] - power_history[--i];
 437             if ((((d == 0) && (i > 6)) || (d == -1)) && (i < 118)) {
 438                 /* top off charging */
 439                 level = MIN(80 + (i*19 / 113), 99);  /* show 81% .. 99% */
 440                 powermgmt_est_runningtime_min = MAX(116 - i, 0);
 441             }
 442             else if ((d < 0) || (i > 117)) {
 443                 /* charging finished */
 444                 level = 100;
 445                 powermgmt_est_runningtime_min = battery_capacity * 60
 446                                                 / runcurrent();
 447             }
 448         }
 449     }
 450     else
 451 #endif /* BATT_LIPOL1300 */
 452     {
 453         if ((battery_millivolts + 20) > percent_to_volt_discharge[0][0])
 454             powermgmt_est_runningtime_min = (level + battery_percent) * 60 *
 455                                          battery_capacity / 200 / runcurrent();
 456         else
 457             powermgmt_est_runningtime_min = (battery_millivolts -
 458                                              battery_level_shutoff[0]) / 2;
 459     }
 460
 461     battery_percent = level;
 462 }
 463
 464 /*
 465  * We shut off in the following cases:
 466  * 1) The unit is idle, not playing music
 467  * 2) The unit is playing music, but is paused
 468  * 3) The battery level has reached shutdown limit
 469  *
 470  * We do not shut off in the following cases:
 471  * 1) The USB is connected
 472  * 2) The charger is connected
 473  * 3) We are recording, or recording with pause
 474  * 4) The radio is playing
 475  */
 476 static void handle_auto_poweroff(void)
 477 {
 478     long timeout = poweroff_idle_timeout_value[poweroff_timeout]*60*HZ;
 479     int  audio_stat = audio_status();
 480
 481 #if CONFIG_CHARGING
 482     /*
 483      * Inhibit shutdown as long as the charger is plugged in.  If it is
 484      * unplugged, wait for a timeout period and then shut down.
 485      */
 486     if(charger_input_state == CHARGER || audio_stat == AUDIO_STATUS_PLAY) {
 487         last_event_tick = current_tick;
 488     }
 489 #endif
 490
 491 #ifndef NO_LOW_BATTERY_SHUTDOWN
 492     /* switch off unit if battery level is too low for reliable operation */
 493     if(battery_millivolts < battery_level_shutoff[battery_type]) {
 494         if(!shutdown_timeout) {
 495             backlight_on();
 496             sys_poweroff();
 497         }
 498     }
 499 #endif
 500
 501     if(timeout &&
 502 #if CONFIG_TUNER && !defined(BOOTLOADER)
 503        (!(get_radio_status() & FMRADIO_PLAYING)) &&
 504 #endif
 505        !usb_inserted() &&
 506        ((audio_stat == 0) ||
 507         ((audio_stat == (AUDIO_STATUS_PLAY | AUDIO_STATUS_PAUSE)) &&
 508          !sleeptimer_active)))
 509     {
 510         if(TIME_AFTER(current_tick, last_event_tick    + timeout) &&
 511            TIME_AFTER(current_tick, last_disk_activity + timeout))
 512         {
 513             sys_poweroff();
 514         }
 515     }
 516     else
 517     {
 518         /* Handle sleeptimer */
 519         if(sleeptimer_active && !usb_inserted())
 520         {
 521             if(TIME_AFTER(current_tick, sleeptimer_endtick))
 522             {
 523                 audio_stop();
 524 #if CONFIG_CHARGING && !defined(HAVE_POWEROFF_WHILE_CHARGING)
 525                 if((charger_input_state == CHARGER) ||
 526                    (charger_input_state == CHARGER_PLUGGED))
 527                 {
 528                     DEBUGF("Sleep timer timeout. Stopping...\n");
 529                     set_sleep_timer(0);
 530                     backlight_off(); /* Nighty, nighty... */
 531                 }
 532                 else
 533 #endif
 534                 {
 535                     DEBUGF("Sleep timer timeout. Shutting off...\n");
 536                     sys_poweroff();
 537                 }
 538             }
 539         }
 540     }
 541 }
 542
 543 /*
 544  * Estimate how much current we are drawing just to run.
 545  */
 546 static int runcurrent(void)
 547 {
 548     int current;
 549
 550 #if MEM == 8 && !defined(HAVE_MMC)
 551     /* assuming 192 kbps, the running time is 22% longer with 8MB */
 552     current = (CURRENT_NORMAL*100/122);
 553 #else
 554     current = CURRENT_NORMAL;
 555 #endif /* MEM == 8 */
 556
 557     if(usb_inserted()
 558 #if defined(HAVE_USB_POWER)
 559   #if (CURRENT_USB < CURRENT_NORMAL)
 560        || usb_powered()
 561   #else
 562        && !usb_powered()
 563   #endif
 564 #endif
 565     )
 566     {
 567         current = CURRENT_USB;
 568     }
 569
 570 #if defined(HAVE_BACKLIGHT) && !defined(BOOTLOADER)
 571     if (backlight_get_current_timeout() == 0) /* LED always on */
 572         current += CURRENT_BACKLIGHT;
 573 #endif
 574
 575 #if defined(HAVE_RECORDING) && defined(CURRENT_RECORD)
 576     if (audio_status() & AUDIO_STATUS_RECORD)
 577         current += CURRENT_RECORD;
 578 #endif
 579
 580 #ifdef HAVE_SPDIF_POWER
 581     if (spdif_powered())
 582         current += CURRENT_SPDIF_OUT;
 583 #endif
 584
 585 #ifdef HAVE_REMOTE_LCD
 586     if (remote_detect())
 587         current += CURRENT_REMOTE;
 588 #endif
 589
 590     return(current);
 591 }
 592
 593
 594 /* Check to see whether or not we've received an alarm in the last second */
 595 #ifdef HAVE_RTC_ALARM
 596 static void power_thread_rtc_process(void)
 597 {
 598     if (rtc_check_alarm_flag()) {
 599         rtc_enable_alarm(false);
 600     }
 601 }
 602 #endif
 603
 604 /*
 605  * This function is called to do the relativly long sleep waits from within the
 606  * main power_thread loop while at the same time servicing any other periodic
 607  * functions in the power thread which need to be called at a faster periodic
 608  * rate than the slow periodic rate of the main power_thread loop.
 609  *
 610  * While we are waiting for the time to expire, we average the battery
 611  * voltages.
 612  */
 613 static void power_thread_sleep(int ticks)
 614 {
 615     int small_ticks;
 616
 617     while (ticks > 0) {
 618
 619 #if CONFIG_CHARGING
 620         /*
 621          * Detect charger plugged/unplugged transitions.  On a plugged or
 622          * unplugged event, we return immediately, run once through the main
 623          * loop (including the subroutines), and end up back here where we
 624          * transition to the appropriate steady state charger on/off state.
 625          */
 626         if(charger_inserted()
 627 #ifdef HAVE_USB_POWER /* USB powered or USB inserted both provide power */
 628                 || usb_powered()
 629 #if CONFIG_CHARGING
 630                 || (usb_inserted() && usb_charging_enabled())
 631 #endif
 632 #endif
 633                 ) {
 634             switch(charger_input_state) {
 635                 case NO_CHARGER:
 636                 case CHARGER_UNPLUGGED:
 637                     charger_input_state = CHARGER_PLUGGED;
 638                     return;
 639                 case CHARGER_PLUGGED:
 640                     queue_broadcast(SYS_CHARGER_CONNECTED, 0);
 641                     charger_input_state = CHARGER;
 642                     break;
 643                 case CHARGER:
 644                     break;
 645             }
 646         } else {    /* charger not inserted */
 647             switch(charger_input_state) {
 648                 case NO_CHARGER:
 649                     break;
 650                 case CHARGER_UNPLUGGED:
 651                     queue_broadcast(SYS_CHARGER_DISCONNECTED, 0);
 652                     charger_input_state = NO_CHARGER;
 653                     break;
 654                 case CHARGER_PLUGGED:
 655                 case CHARGER:
 656                     charger_input_state = CHARGER_UNPLUGGED;
 657                     return;
 658             }
 659         }
 660 #endif
 661 #if CONFIG_CHARGING == CHARGING_MONITOR
 662         switch (charger_input_state) {
 663             case CHARGER_UNPLUGGED:
 664             case NO_CHARGER:
 665                 charge_state = DISCHARGING;
 666                 break;
 667             case CHARGER_PLUGGED:
 668             case CHARGER:
 669                 if (charging_state()) {
 670                     charge_state = CHARGING;
 671                 } else {
 672                     charge_state = DISCHARGING;
 673                 }
 674                 break;
 675         }
 676
 677 #endif /* CONFIG_CHARGING == CHARGING_MONITOR */
 678
 679         small_ticks = MIN(HZ/2, ticks);
 680         sleep(small_ticks);
 681         ticks -= small_ticks;
 682
 683         /* If the power off timeout expires, the main thread has failed
 684            to shut down the system, and we need to force a power off */
 685         if(shutdown_timeout) {
 686             shutdown_timeout -= small_ticks;
 687             if(shutdown_timeout <= 0)
 688                 power_off();
 689         }
 690
 691 #ifdef HAVE_RTC_ALARM
 692         power_thread_rtc_process();
 693 #endif
 694
 695         /*
 696          * Do a digital exponential filter.  We don't sample the battery if
 697          * the disk is spinning unless we are in USB mode (the disk will most
 698          * likely always be spinning in USB mode).
 699          */
 700         if (!ata_disk_is_active() || usb_inserted()) {
 701             avgbat += battery_adc_voltage() - (avgbat / BATT_AVE_SAMPLES);
 702             /*
 703              * battery_millivolts is the millivolt-scaled filtered battery value.
 704              */
 705             battery_millivolts = avgbat / BATT_AVE_SAMPLES;
 706
 707             /* update battery status every time an update is available */
 708             battery_status_update();
 709         }
 710         else if (battery_percent < 8) {
 711             /* If battery is low, observe voltage during disk activity.
 712              * Shut down if voltage drops below shutoff level and we are not
 713              * using NiMH or Alkaline batteries.
 714              */
 715             battery_millivolts = (battery_adc_voltage() +
 716                                   battery_millivolts + 1) / 2;
 717
 718             /* update battery status every time an update is available */
 719             battery_status_update();
 720
 721 #ifndef NO_LOW_BATTERY_SHUTDOWN
 722             if (!shutdown_timeout &&
 723                 (battery_millivolts < battery_level_shutoff[battery_type]))
 724                 sys_poweroff();
 725             else
 726 #endif
 727                 avgbat += battery_millivolts - (avgbat / BATT_AVE_SAMPLES);
 728         }
 729
 730 #if CONFIG_CHARGING == CHARGING_CONTROL
 731         if (ata_disk_is_active()) {
 732             /* flag hdd use for charging calculation */
 733             disk_activity_last_cycle = true;
 734         }
 735 #endif
 736 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
 737         /*
 738          * If we have a lot of pending writes or if the disk is spining,
 739          * fsync the debug log file.
 740          */
 741         if((wrcount > 10) || ((wrcount > 0) && ata_disk_is_active())) {
 742             fsync(fd);
 743             wrcount = 0;
 744         }
 745 #endif
 746     }
 747 }
 748
 749
 750 /*
 751  * This power thread maintains a history of battery voltage
 752  * and implements a charging algorithm.
 753  * For a complete description of the charging algorithm read
 754  * docs/CHARGING_ALGORITHM.
 755  */
 756
 757 static void power_thread(void)
 758 {
 759 #if CONFIG_CHARGING == CHARGING_CONTROL
 760     int i;
 761     unsigned int target_voltage = TRICKLE_VOLTAGE;    /* desired topoff/trickle
 762                                        * voltage level */
 763     int charge_max_time_idle = 0;     /* max. charging duration, calculated at
 764                                        * beginning of charging */
 765     int charge_max_time_now = 0;      /* max. charging duration including
 766                                        * hdd activity */
 767     int minutes_disk_activity = 0;    /* count minutes of hdd use during
 768                                        * charging */
 769     int last_disk_activity = CHARGE_END_LONGD + 1; /* last hdd use x mins ago */
 770 #endif
 771
 772     /* initialize the voltages for the exponential filter */
 773     avgbat = battery_adc_voltage() + 15;
 774
 775 #ifndef HAVE_MMC  /* this adjustment is only needed for HD based */
 776         /* The battery voltage is usually a little lower directly after
 777            turning on, because the disk was used heavily. Raise it by 5% */
 778 #ifdef HAVE_CHARGING
 779     if(!charger_inserted()) /* only if charger not connected */
 780 #endif
 781         avgbat += (percent_to_volt_discharge[battery_type][6] -
 782                    percent_to_volt_discharge[battery_type][5]) / 2;
 783 #endif /* not HAVE_MMC */
 784
 785     avgbat = avgbat * BATT_AVE_SAMPLES;
 786     battery_millivolts = avgbat / BATT_AVE_SAMPLES;
 787
 788 #if CONFIG_CHARGING
 789     if(charger_inserted()) {
 790         battery_percent  = voltage_to_percent(battery_millivolts,
 791                            percent_to_volt_charge);
 792 #if defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES)
 793         /* Checking for iriver is a temporary kludge. */
 794         charger_input_state = CHARGER;
 795 #endif
 796     } else
 797 #endif
 798     {   battery_percent  = voltage_to_percent(battery_millivolts,
 799                            percent_to_volt_discharge[battery_type]);
 800         battery_percent += (battery_percent < 100);
 801     }
 802
 803 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
 804     fd      = -1;
 805     wrcount = 0;
 806 #endif
 807
 808     while (1)
 809     {
 810         /* rotate the power history */
 811         memmove(power_history + 1, power_history,
 812                 sizeof(power_history) - sizeof(power_history[0]));
 813
 814         /* insert new value at the start, in millivolts 8-) */
 815         power_history[0] = battery_millivolts;
 816
 817 #if CONFIG_CHARGING == CHARGING_CONTROL
 818         if (charger_input_state == CHARGER_PLUGGED) {
 819             pid_p = 0;
 820             pid_i = 0;
 821             snprintf(power_message, POWER_MESSAGE_LEN, "Charger plugged in");
 822             /*
 823              * The charger was just plugged in.  If the battery level is
 824              * nearly charged, just trickle.  If the battery is low, start
 825              * a full charge cycle.  If the battery level is in between,
 826              * top-off and then trickle.
 827              */
 828             if(battery_percent > START_TOPOFF_CHG) {
 829                 powermgmt_last_cycle_level = battery_percent;
 830                 powermgmt_last_cycle_startstop_min = 0;
 831                 if(battery_percent >= START_TRICKLE_CHG) {
 832                     charge_state = TRICKLE;
 833                     target_voltage = TRICKLE_VOLTAGE;
 834                 } else {
 835                     charge_state = TOPOFF;
 836                     target_voltage = TOPOFF_VOLTAGE;
 837                 }
 838             } else {
 839                 /*
 840                  * Start the charger full strength
 841                  */
 842                 i = CHARGE_MAX_TIME_1500 * battery_capacity / 1500;
 843                 charge_max_time_idle =
 844                     i * (100 + 35 - battery_percent) / 100;
 845                 if (charge_max_time_idle > i) {
 846                     charge_max_time_idle = i;
 847                 }
 848                 charge_max_time_now = charge_max_time_idle;
 849
 850                 snprintf(power_message, POWER_MESSAGE_LEN,
 851                          "ChgAt %d%% max %dm", battery_level(),
 852                          charge_max_time_now);
 853
 854                 /* enable the charger after the max time calc is done,
 855                    because battery_level depends on if the charger is
 856                    on */
 857                 DEBUGF("power: charger inserted and battery"
 858                        " not full, charging\n");
 859                 powermgmt_last_cycle_level = battery_percent;
 860                 powermgmt_last_cycle_startstop_min = 0;
 861                 trickle_sec  = 60;
 862                 long_delta   = short_delta = 999999;
 863                 charge_state = CHARGING;
 864             }
 865         }
 866         if (charge_state == CHARGING) {
 867             /* alter charge time max length with extra disk use */
 868             if (disk_activity_last_cycle) {
 869                 minutes_disk_activity++;
 870                 charge_max_time_now = charge_max_time_idle +
 871                                      (minutes_disk_activity * 2 / 5);
 872                 disk_activity_last_cycle = false;
 873                 last_disk_activity = 0;
 874             } else {
 875                 last_disk_activity++;
 876             }
 877             /*
 878              * Check the delta voltage over the last X minutes so we can do
 879              * our end-of-charge logic based on the battery level change.
 880              *(no longer use minimum time as logic for charge end has 50
 881              * minutes minimum charge built in)
 882              */
 883             if (powermgmt_last_cycle_startstop_min > CHARGE_END_SHORTD) {
 884                 short_delta = power_history[0] -
 885                               power_history[CHARGE_END_SHORTD - 1];
 886             }
 887
 888             if (powermgmt_last_cycle_startstop_min > CHARGE_END_LONGD) {
 889             /*
 890              * Scan the history: the points where measurement is taken need to
 891              * be fairly static. (check prior to short delta 'area')
 892              * (also only check first and last 10 cycles - delta in middle OK)
 893              */
 894                 long_delta = power_history[0] -
 895                              power_history[CHARGE_END_LONGD - 1];
 896
 897                 for(i = CHARGE_END_SHORTD; i < CHARGE_END_SHORTD + 10; i++) {
 898                     if(((power_history[i] - power_history[i+1]) >  50) ||
 899                        ((power_history[i] - power_history[i+1]) < -50)) {
 900                         long_delta = 777777;
 901                         break;
 902                     }
 903                 }
 904                  for(i = CHARGE_END_LONGD - 11; i < CHARGE_END_LONGD - 1 ; i++) {
 905                     if(((power_history[i] - power_history[i+1]) >  50) ||
 906                        ((power_history[i] - power_history[i+1]) < -50)) {
 907                         long_delta = 888888;
 908                         break;
 909                     }
 910                 }
 911             }
 912
 913             snprintf(power_message, POWER_MESSAGE_LEN,
 914                      "Chg %dm, max %dm", powermgmt_last_cycle_startstop_min,
 915                      charge_max_time_now);
 916             /*
 917              * End of charge criteria (any qualify):
 918              * 1) Charged a long time
 919              * 2) DeltaV went negative for a short time ( & long delta static)
 920              * 3) DeltaV was negative over a longer period (no disk use only)
 921              * Note: short_delta and long_delta are millivolts
 922              */
 923             if ((powermgmt_last_cycle_startstop_min >= charge_max_time_now) ||
 924                 (short_delta <= -50 && long_delta < 50 ) || (long_delta  < -20 &&
 925                 last_disk_activity > CHARGE_END_LONGD)) {
 926                 if (powermgmt_last_cycle_startstop_min > charge_max_time_now) {
 927                     DEBUGF("power: powermgmt_last_cycle_startstop_min > charge_max_time_now, "
 928                            "enough!\n");
 929                     /*
 930                      *have charged too long and deltaV detection did not
 931                      *work!
 932                      */
 933                      snprintf(power_message, POWER_MESSAGE_LEN,
 934                              "Chg tmout %d min", charge_max_time_now);
 935                     /*
 936                      * Switch to trickle charging.  We skip the top-off
 937                      * since we've effectively done the top-off operation
 938                      * already since we charged for the maximum full
 939                      * charge time.
 940                      */
 941                     powermgmt_last_cycle_level = battery_percent;
 942                     powermgmt_last_cycle_startstop_min = 0;
 943                     charge_state = TRICKLE;
 944
 945                     /*
 946                      * set trickle charge target to a relative voltage instead
 947                      * of an arbitrary value - the fully charged voltage may
 948                      * vary according to ambient temp, battery condition etc
 949                      * trickle target is -0.15v from full voltage acheived
 950                      * topup target is -0.05v from full voltage
 951                      */
 952                     target_voltage = power_history[0] - 150;
 953
 954                 } else {
 955                     if(short_delta <= -5) {
 956                         DEBUGF("power: short-term negative"
 957                                " delta, enough!\n");
 958                         snprintf(power_message, POWER_MESSAGE_LEN,
 959                                  "end negd %d %dmin", short_delta,
 960                                  powermgmt_last_cycle_startstop_min);
 961                         target_voltage = power_history[CHARGE_END_SHORTD - 1]
 962                                          - 50;
 963                     } else {
 964                         DEBUGF("power: long-term small "
 965                                "positive delta, enough!\n");
 966                         snprintf(power_message, POWER_MESSAGE_LEN,
 967                                  "end lowd %d %dmin", long_delta,
 968                                  powermgmt_last_cycle_startstop_min);
 969                         target_voltage = power_history[CHARGE_END_LONGD - 1]
 970                                          - 50;
 971                     }
 972                     /*
 973                      * Switch to top-off charging.
 974                      */
 975                     powermgmt_last_cycle_level = battery_percent;
 976                     powermgmt_last_cycle_startstop_min = 0;
 977                     charge_state = TOPOFF;
 978                 }
 979             }
 980         }
 981         else if (charge_state != DISCHARGING)  /* top off or trickle */
 982         {
 983             /*
 984              *Time to switch from topoff to trickle?
 985              */
 986             if ((charge_state == TOPOFF) &&
 987                 (powermgmt_last_cycle_startstop_min > TOPOFF_MAX_TIME))
 988             {
 989                 powermgmt_last_cycle_level = battery_percent;
 990                 powermgmt_last_cycle_startstop_min = 0;
 991                 charge_state = TRICKLE;
 992                 target_voltage = target_voltage - 100;
 993             }
 994             /*
 995              * Adjust trickle charge time (proportional and integral terms).
 996              * Note: I considered setting the level higher if the USB is
 997              * plugged in, but it doesn't appear to be necessary and will
 998              * generate more heat [gvb].
 999              */
1000
1001             pid_p = ((signed)target_voltage - (signed)battery_millivolts) / 5;
1002             if((pid_p <= PID_DEADZONE) && (pid_p >= -PID_DEADZONE))
1003                 pid_p = 0;
1004
1005             if((unsigned) battery_millivolts < target_voltage) {
1006                 if(pid_i < 60) {
1007                     pid_i++;        /* limit so it doesn't "wind up" */
1008                 }
1009             } else {
1010                 if(pid_i > 0) {
1011                     pid_i--;        /* limit so it doesn't "wind up" */
1012                 }
1013             }
1014
1015             trickle_sec = pid_p + pid_i;
1016
1017             if(trickle_sec > 60) {
1018                 trickle_sec = 60;
1019             }
1020             if(trickle_sec < 0) {
1021                 trickle_sec = 0;
1022             }
1023
1024         } else if (charge_state == DISCHARGING) {
1025             trickle_sec = 0;
1026             /*
1027              * The charger is enabled here only in one case: if it was
1028              * turned on at boot time (power_init).  Turn it off now.
1029              */
1030             if (charger_enabled)
1031                 charger_enable(false);
1032         }
1033
1034         if (charger_input_state == CHARGER_UNPLUGGED) {
1035             /*
1036              * The charger was just unplugged.
1037              */
1038             DEBUGF("power: charger disconnected, disabling\n");
1039
1040             charger_enable(false);
1041             powermgmt_last_cycle_level = battery_percent;
1042             powermgmt_last_cycle_startstop_min = 0;
1043             trickle_sec  = 0;
1044             pid_p        = 0;
1045             pid_i        = 0;
1046             charge_state = DISCHARGING;
1047             snprintf(power_message, POWER_MESSAGE_LEN, "Charger: discharge");
1048         }
1049
1050 #endif /* CONFIG_CHARGING == CHARGING_CONTROL */
1051
1052         /* sleep for a minute */
1053
1054 #if CONFIG_CHARGING == CHARGING_CONTROL
1055         if(trickle_sec > 0) {
1056             charger_enable(true);
1057             power_thread_sleep(HZ * trickle_sec);
1058         }
1059         if(trickle_sec < 60)
1060             charger_enable(false);
1061         power_thread_sleep(HZ * (60 - trickle_sec));
1062 #else
1063         power_thread_sleep(HZ * 60);
1064 #endif
1065
1066 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
1067         if(usb_inserted()) {
1068             if(fd >= 0) {
1069                 /* It is probably too late to close the file but we can try...*/
1070                 close(fd);
1071                 fd = -1;
1072             }
1073         } else {
1074             if(fd < 0) {
1075                 fd = open(DEBUG_FILE_NAME, O_WRONLY | O_APPEND | O_CREAT);
1076                 if(fd >= 0) {
1077                     snprintf(debug_message, DEBUG_MESSAGE_LEN,
1078                     "cycle_min, bat_millivolts, bat_percent, chgr_state, charge_state, pid_p, pid_i, trickle_sec\n");
1079                     write(fd, debug_message, strlen(debug_message));
1080                     wrcount = 99;   /* force a flush */
1081                 }
1082             }
1083             if(fd >= 0) {
1084                 snprintf(debug_message, DEBUG_MESSAGE_LEN,
1085                         "%d, %d, %d, %d, %d, %d, %d, %d\n",
1086                     powermgmt_last_cycle_startstop_min, battery_millivolts,
1087                     battery_percent, charger_input_state, charge_state,
1088                     pid_p, pid_i, trickle_sec);
1089                 write(fd, debug_message, strlen(debug_message));
1090                 wrcount++;
1091             }
1092         }
1093 #endif
1094         handle_auto_poweroff();
1095
1096 #if CONFIG_CHARGING == CHARGING_CONTROL
1097         powermgmt_last_cycle_startstop_min++;
1098 #endif
1099     }
1100 }
1101
1102 void powermgmt_init(void)
1103 {
1104     /* init history to 0 */
1105     memset(power_history, 0x00, sizeof(power_history));
1106     create_thread(power_thread, power_stack, sizeof(power_stack), 0,
1107                   power_thread_name IF_PRIO(, PRIORITY_SYSTEM)
1108                           IF_COP(, CPU));
1109 }
1110
1111 #endif /* SIMULATOR */
1112
1113 void sys_poweroff(void)
1114 {
1115     logf("sys_poweroff()");
1116     /* If the main thread fails to shut down the system, we will force a
1117        power off after an 20 second timeout - 28 seconds if recording */
1118     if (shutdown_timeout == 0)
1119     {
1120 #if (defined(IAUDIO_X5) || defined(IAUDIO_M5)) && !defined (SIMULATOR)
1121         pcf50606_reset_timeout(); /* Reset timer on first attempt only */
1122 #endif
1123 #ifdef HAVE_RECORDING
1124         if (audio_status() & AUDIO_STATUS_RECORD)
1125             shutdown_timeout += HZ*8;
1126 #endif
1127         shutdown_timeout += HZ*20;
1128     }
1129
1130     queue_broadcast(SYS_POWEROFF, 0);
1131 }
1132
1133 void cancel_shutdown(void)
1134 {
1135     logf("sys_cancel_shutdown()");
1136
1137 #if (defined(IAUDIO_X5) || defined(IAUDIO_M5)) && !defined (SIMULATOR)
1138     /* TODO: Move some things to target/ tree */
1139     if (shutdown_timeout)
1140         pcf50606_reset_timeout();
1141 #endif
1142
1143     shutdown_timeout = 0;
1144 }
1145
1146 /* Various hardware housekeeping tasks relating to shutting down the jukebox */
1147 void shutdown_hw(void)
1148 {
1149 #ifndef SIMULATOR
1150 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
1151     if(fd >= 0) {
1152         close(fd);
1153         fd = -1;
1154     }
1155 #endif
1156     audio_stop();
1157     if (battery_level_safe()) { /* do not save on critical battery */
1158 #ifdef HAVE_LCD_BITMAP
1159         glyph_cache_save();
1160 #endif
1161         if(ata_disk_is_active())
1162             ata_spindown(1);
1163     }
1164     while(ata_disk_is_active())
1165         sleep(HZ/10);
1166
1167 #if CONFIG_CODEC != SWCODEC
1168     mp3_shutdown();
1169 #else
1170     audiohw_close();
1171 #endif
1172
1173     /* If HD is still active we try to wait for spindown, otherwise the
1174        shutdown_timeout in power_thread_sleep will force a power off */
1175     while(ata_disk_is_active())
1176         sleep(HZ/10);
1177 #ifndef IAUDIO_X5
1178     lcd_set_contrast(0);
1179 #endif /* IAUDIO_X5 */
1180 #ifdef HAVE_REMOTE_LCD
1181     lcd_remote_set_contrast(0);
1182 #endif
1183
1184 #ifdef HAVE_LCD_SHUTDOWN
1185     lcd_shutdown();
1186 #endif
1187
1188     /* Small delay to make sure all HW gets time to flush. Especially
1189        eeprom chips are quite slow and might be still writing the last
1190        byte. */
1191     sleep(HZ/4);
1192     power_off();
1193 #endif /* #ifndef SIMULATOR */
1194 }