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 static void send_battery_level_event(void);
  84 static int last_sent_battery_level = 100;
  85
  86 #if CONFIG_CHARGING
  87 charger_input_state_type charger_input_state IDATA_ATTR;
  88 #endif
  89
  90 #ifdef SIMULATOR /***********************************************************/
  91
  92 #define BATT_MINMVOLT   2500            /* minimum millivolts of battery */
  93 #define BATT_MAXMVOLT   4500            /* maximum millivolts of battery */
  94 #define BATT_MAXRUNTIME (10 * 60)       /* maximum runtime with full battery in minutes */
  95
  96 static unsigned int battery_millivolts = (unsigned int)BATT_MAXMVOLT;
  97 static int battery_percent = 100;       /* battery capacity level in percent */
  98 static int powermgmt_est_runningtime_min = BATT_MAXRUNTIME; /* estimated remaining time in minutes */
  99
 100 static void battery_status_update(void)
 101 {
 102     static time_t last_change = 0;
 103     static bool charging = false;
 104     time_t now;
 105
 106     time(&now);
 107     if (last_change < now)
 108     {
 109         last_change = now;
 110
 111         /* change the values: */
 112         if (charging)
 113         {
 114             if (battery_millivolts >= BATT_MAXMVOLT)
 115             {
 116                 /* Pretend the charger was disconnected */
 117                 charging = false;
 118                 queue_broadcast(SYS_CHARGER_DISCONNECTED, 0);
 119                 last_sent_battery_level = 100;
 120             }
 121         }
 122         else
 123         {
 124             if (battery_millivolts <= BATT_MINMVOLT)
 125             {
 126                 /* Pretend the charger was connected */
 127                 charging = true;
 128                 queue_broadcast(SYS_CHARGER_CONNECTED, 0);
 129                 last_sent_battery_level = 0;
 130             }
 131         }
 132         if (charging)
 133             battery_millivolts += (BATT_MAXMVOLT - BATT_MINMVOLT) / 50;
 134         else
 135             battery_millivolts -= (BATT_MAXMVOLT - BATT_MINMVOLT) / 100;
 136
 137         battery_percent = 100 * (battery_millivolts - BATT_MINMVOLT) / (BATT_MAXMVOLT - BATT_MINMVOLT);
 138         powermgmt_est_runningtime_min = battery_percent * BATT_MAXRUNTIME / 100;
 139     }
 140     send_battery_level_event();
 141 }
 142
 143 void battery_read_info(int *voltage, int *level)
 144 {
 145     battery_status_update();
 146
 147     if (voltage)
 148         *voltage = battery_millivolts;
 149
 150     if (level)
 151         *level = battery_percent;
 152 }
 153
 154 unsigned int battery_voltage(void)
 155 {
 156     battery_status_update();
 157     return battery_millivolts;
 158 }
 159
 160 int battery_level(void)
 161 {
 162     battery_status_update();
 163     return battery_percent;
 164 }
 165
 166 int battery_time(void)
 167 {
 168     battery_status_update();
 169     return powermgmt_est_runningtime_min;
 170 }
 171
 172 bool battery_level_safe(void)
 173 {
 174     return battery_level() >= 10;
 175 }
 176
 177 void set_poweroff_timeout(int timeout)
 178 {
 179     (void)timeout;
 180 }
 181
 182 void set_battery_capacity(int capacity)
 183 {
 184   (void)capacity;
 185 }
 186
 187 #if BATTERY_TYPES_COUNT > 1
 188 void set_battery_type(int type)
 189 {
 190     (void)type;
 191 }
 192 #endif
 193
 194 void reset_poweroff_timer(void)
 195 {
 196 }
 197
 198 #else /* not SIMULATOR ******************************************************/
 199
 200 static const unsigned char poweroff_idle_timeout_value[15] =
 201 {
 202     0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 30, 45, 60
 203 };
 204
 205 #if CONFIG_CHARGING == CHARGING_CONTROL
 206 int long_delta;                     /* long term delta battery voltage */
 207 int short_delta;                    /* short term delta battery voltage */
 208 bool disk_activity_last_cycle = false;         /* flag set to aid charger time
 209                                                 * calculation */
 210 char power_message[POWER_MESSAGE_LEN] = "";    /* message that's shown in
 211                                                   debug menu */
 212                                                /* percentage at which charging
 213                                                   starts */
 214 int powermgmt_last_cycle_startstop_min = 0;    /* how many minutes ago was the
 215                                                   charging started or
 216                                                   stopped? */
 217 int powermgmt_last_cycle_level = 0;            /* which level had the
 218                                                   batteries at this time? */
 219 int trickle_sec = 0;                           /* how many seconds should the
 220                                                   charger be enabled per
 221                                                   minute for trickle
 222                                                   charging? */
 223 int pid_p = 0;                      /* PID proportional term */
 224 int pid_i = 0;                      /* PID integral term */
 225 #endif /* CONFIG_CHARGING == CHARGING_CONTROL */
 226
 227 /*
 228  * Average battery voltage and charger voltage, filtered via a digital
 229  * exponential filter.
 230  */
 231 static unsigned int avgbat;     /* average battery voltage (filtering) */
 232 static unsigned int battery_millivolts;/* filtered battery voltage, millivolts */
 233
 234 #ifdef HAVE_CHARGE_CTRL
 235 #define BATT_AVE_SAMPLES    32  /* filter constant / @ 2Hz sample rate */
 236 #else
 237 #define BATT_AVE_SAMPLES   128  /* slw filter constant for all others */
 238 #endif
 239
 240 /* battery level (0-100%) of this minute, updated once per minute */
 241 static int battery_percent  = -1;
 242 static int battery_capacity = BATTERY_CAPACITY_DEFAULT; /* default value, mAh */
 243 #if BATTERY_TYPES_COUNT > 1
 244 static int battery_type     = 0;
 245 #else
 246 #define battery_type 0
 247 #endif
 248
 249 /* Power history: power_history[0] is the newest sample */
 250 unsigned short power_history[POWER_HISTORY_LEN];
 251
 252 static char power_stack[DEFAULT_STACK_SIZE/2 + DEBUG_STACK];
 253 static const char power_thread_name[] = "power";
 254
 255 static int poweroff_timeout = 0;
 256 static int powermgmt_est_runningtime_min = -1;
 257
 258 static bool sleeptimer_active = false;
 259 static long sleeptimer_endtick;
 260
 261 static long last_event_tick;
 262
 263 static int voltage_to_battery_level(int battery_millivolts);
 264 static void battery_status_update(void);
 265 static int runcurrent(void);
 266
 267 void battery_read_info(int *voltage, int *level)
 268 {
 269     int millivolts = battery_adc_voltage();
 270
 271     if (voltage)
 272         *voltage = millivolts;
 273
 274     if (level)
 275         *level = voltage_to_battery_level(millivolts);
 276 }
 277
 278 void reset_poweroff_timer(void)
 279 {
 280     last_event_tick = current_tick;
 281 }
 282
 283 #if BATTERY_TYPES_COUNT > 1
 284 void set_battery_type(int type)
 285 {
 286     if (type != battery_type) {
 287         battery_type = type;
 288         battery_status_update();     /* recalculate the battery status */
 289     }
 290 }
 291 #endif
 292
 293 void set_battery_capacity(int capacity)
 294 {
 295     battery_capacity = capacity;
 296     if (battery_capacity > BATTERY_CAPACITY_MAX)
 297         battery_capacity = BATTERY_CAPACITY_MAX;
 298     if (battery_capacity < BATTERY_CAPACITY_MIN)
 299         battery_capacity = BATTERY_CAPACITY_MIN;
 300     battery_status_update();     /* recalculate the battery status */
 301 }
 302
 303 int battery_time(void)
 304 {
 305     return powermgmt_est_runningtime_min;
 306 }
 307
 308 /* Returns battery level in percent */
 309 int battery_level(void)
 310 {
 311     return battery_percent;
 312 }
 313
 314 /* Returns filtered battery voltage [millivolts] */
 315 unsigned int battery_voltage(void)
 316 {
 317     return battery_millivolts;
 318 }
 319
 320 /* Tells if the battery level is safe for disk writes */
 321 bool battery_level_safe(void)
 322 {
 323     return battery_millivolts > battery_level_dangerous[battery_type];
 324 }
 325
 326 void set_poweroff_timeout(int timeout)
 327 {
 328     poweroff_timeout = timeout;
 329 }
 330
 331 void set_sleep_timer(int seconds)
 332 {
 333     if(seconds) {
 334         sleeptimer_active  = true;
 335         sleeptimer_endtick = current_tick + seconds * HZ;
 336     }
 337     else {
 338         sleeptimer_active  = false;
 339         sleeptimer_endtick = 0;
 340     }
 341 }
 342
 343 int get_sleep_timer(void)
 344 {
 345     if(sleeptimer_active)
 346         return (sleeptimer_endtick - current_tick) / HZ;
 347     else
 348         return 0;
 349 }
 350
 351 /* look into the percent_to_volt_* table and get a realistic battery level */
 352 static int voltage_to_percent(int voltage, const short* table)
 353 {
 354     if (voltage <= table[0])
 355         return 0;
 356     else
 357         if (voltage >= table[10])
 358             return 100;
 359         else {
 360             /* search nearest value */
 361             int i = 0;
 362             while ((i < 10) && (table[i+1] < voltage))
 363                 i++;
 364             /* interpolate linear between the smaller and greater value */
 365             return (i * 10) /* Tens digit, 10% per entry */
 366                 + (((voltage - table[i]) * 10)
 367                    / (table[i+1] - table[i])); /* Ones digit: interpolated */
 368         }
 369 }
 370
 371 /* update battery level and estimated runtime, called once per minute or
 372  * when battery capacity / type settings are changed */
 373 static int voltage_to_battery_level(int battery_millivolts)
 374 {
 375     int level;
 376
 377 #if defined(CONFIG_CHARGER) \
 378  && (defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES))
 379     /* Checking for iriver is a temporary kludge.
 380      * This code needs rework/unification */
 381     if (charger_input_state == NO_CHARGER) {
 382         /* discharging. calculate new battery level and average with last */
 383         level = voltage_to_percent(battery_millivolts,
 384                 percent_to_volt_discharge[battery_type]);
 385         if (level != (battery_percent - 1))
 386             level = (level + battery_percent + 1) / 2;
 387     }
 388     else if (charger_input_state == CHARGER_UNPLUGGED) {
 389         /* just unplugged. adjust filtered values */
 390         battery_millivolts -= percent_to_volt_charge[battery_percent/10] -
 391                               percent_to_volt_discharge[0][battery_percent/10];
 392         avgbat = battery_millivolts * 1000 * BATT_AVE_SAMPLES;
 393         level  = battery_percent;
 394     }
 395     else if (charger_input_state == CHARGER_PLUGGED) {
 396         /* just plugged in. adjust battery values */
 397         battery_millivolts += percent_to_volt_charge[battery_percent/10] -
 398                               percent_to_volt_discharge[0][battery_percent/10];
 399         avgbat = battery_millivolts * 1000 * BATT_AVE_SAMPLES;
 400         level  = MIN(12 * battery_percent / 10, 99);
 401     }
 402     else { /* charging. calculate new battery level */
 403         level = voltage_to_percent(battery_millivolts,
 404                 percent_to_volt_charge);
 405     }
 406 #elif CONFIG_CHARGING >= CHARGING_MONITOR
 407     if (charge_state == DISCHARGING) {
 408         level = voltage_to_percent(battery_millivolts,
 409                     percent_to_volt_discharge[battery_type]);
 410     }
 411     else if (charge_state == CHARGING) {
 412         /* battery level is defined to be < 100% until charging is finished */
 413         level = MIN(voltage_to_percent(battery_millivolts,
 414                     percent_to_volt_charge), 99);
 415     }
 416     else { /* in topoff/trickle charge, battery is by definition 100% full */
 417         level = 100;
 418     }
 419 #else
 420     /* always use the discharge table */
 421     level = voltage_to_percent(battery_millivolts,
 422                 percent_to_volt_discharge[battery_type]);
 423 #endif
 424
 425     return level;
 426 }
 427
 428 static void battery_status_update(void)
 429 {
 430     int level = voltage_to_battery_level(battery_millivolts);
 431
 432     /* calculate estimated remaining running time */
 433     /* discharging: remaining running time */
 434     /* charging:    remaining charging time */
 435 #if CONFIG_CHARGING >= CHARGING_MONITOR
 436     if (charge_state == CHARGING) {
 437         powermgmt_est_runningtime_min = (100 - level) * battery_capacity * 60
 438                                       / 100 / (CURRENT_MAX_CHG - runcurrent());
 439     }
 440     else
 441 #elif CONFIG_CHARGING \
 442   && (defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES))
 443     /* Checking for iriver is a temporary kludge.
 444      * This code needs rework/unification */
 445     if (charger_inserted()) {
 446 #ifdef IRIVER_H300_SERIES
 447         /* H300_SERIES use CURRENT_MAX_CHG for basic charge time (80%)
 448          * plus 110 min top off charge time */
 449         powermgmt_est_runningtime_min = ((100-level) * battery_capacity * 80
 450                                          /100 / CURRENT_MAX_CHG) + 110;
 451 #else
 452         /* H100_SERIES scaled for 160 min basic charge time (80%) on
 453          * 1600 mAh battery plus 110 min top off charge time */
 454         powermgmt_est_runningtime_min = ((100 - level) * battery_capacity
 455                                          / 993) + 110;
 456 #endif
 457         level = (level * 80) / 100;
 458         if (level > 72) { /* > 91% */
 459             int i = POWER_HISTORY_LEN;
 460             int d = 1;
 461 #ifdef HAVE_CHARGE_STATE
 462             if (charge_state == DISCHARGING)
 463                 d = -2;
 464 #endif
 465             while ((i > 2) && (d > 0)) /* search zero or neg. delta */
 466                 d = power_history[0] - power_history[--i];
 467             if ((((d == 0) && (i > 6)) || (d == -1)) && (i < 118)) {
 468                 /* top off charging */
 469                 level = MIN(80 + (i*19 / 113), 99);  /* show 81% .. 99% */
 470                 powermgmt_est_runningtime_min = MAX(116 - i, 0);
 471             }
 472             else if ((d < 0) || (i > 117)) {
 473                 /* charging finished */
 474                 level = 100;
 475                 powermgmt_est_runningtime_min = battery_capacity * 60
 476                                                 / runcurrent();
 477             }
 478         }
 479     }
 480     else
 481 #endif /* BATT_LIPOL1300 */
 482     {
 483         if ((battery_millivolts + 20) > percent_to_volt_discharge[0][0])
 484             powermgmt_est_runningtime_min = (level + battery_percent) * 60 *
 485                                          battery_capacity / 200 / runcurrent();
 486         else
 487             powermgmt_est_runningtime_min = (battery_millivolts -
 488                                              battery_level_shutoff[0]) / 2;
 489     }
 490
 491     battery_percent = level;
 492     send_battery_level_event();
 493 }
 494
 495 /*
 496  * We shut off in the following cases:
 497  * 1) The unit is idle, not playing music
 498  * 2) The unit is playing music, but is paused
 499  * 3) The battery level has reached shutdown limit
 500  *
 501  * We do not shut off in the following cases:
 502  * 1) The USB is connected
 503  * 2) The charger is connected
 504  * 3) We are recording, or recording with pause
 505  * 4) The radio is playing
 506  */
 507 static void handle_auto_poweroff(void)
 508 {
 509     long timeout = poweroff_idle_timeout_value[poweroff_timeout]*60*HZ;
 510     int  audio_stat = audio_status();
 511
 512 #if CONFIG_CHARGING
 513     /*
 514      * Inhibit shutdown as long as the charger is plugged in.  If it is
 515      * unplugged, wait for a timeout period and then shut down.
 516      */
 517     if(charger_input_state == CHARGER || audio_stat == AUDIO_STATUS_PLAY) {
 518         last_event_tick = current_tick;
 519     }
 520 #endif
 521
 522 #ifndef NO_LOW_BATTERY_SHUTDOWN
 523     /* switch off unit if battery level is too low for reliable operation */
 524     if(battery_millivolts < battery_level_shutoff[battery_type]) {
 525         if(!shutdown_timeout) {
 526             backlight_on();
 527             sys_poweroff();
 528         }
 529     }
 530 #endif
 531
 532     if(timeout &&
 533 #if CONFIG_TUNER && !defined(BOOTLOADER)
 534        (!(get_radio_status() & FMRADIO_PLAYING)) &&
 535 #endif
 536        !usb_inserted() &&
 537        ((audio_stat == 0) ||
 538         ((audio_stat == (AUDIO_STATUS_PLAY | AUDIO_STATUS_PAUSE)) &&
 539          !sleeptimer_active)))
 540     {
 541         if(TIME_AFTER(current_tick, last_event_tick    + timeout) &&
 542            TIME_AFTER(current_tick, last_disk_activity + timeout))
 543         {
 544             sys_poweroff();
 545         }
 546     }
 547     else
 548     {
 549         /* Handle sleeptimer */
 550         if(sleeptimer_active && !usb_inserted())
 551         {
 552             if(TIME_AFTER(current_tick, sleeptimer_endtick))
 553             {
 554                 audio_stop();
 555 #if CONFIG_CHARGING && !defined(HAVE_POWEROFF_WHILE_CHARGING)
 556                 if((charger_input_state == CHARGER) ||
 557                    (charger_input_state == CHARGER_PLUGGED))
 558                 {
 559                     DEBUGF("Sleep timer timeout. Stopping...\n");
 560                     set_sleep_timer(0);
 561                     backlight_off(); /* Nighty, nighty... */
 562                 }
 563                 else
 564 #endif
 565                 {
 566                     DEBUGF("Sleep timer timeout. Shutting off...\n");
 567                     sys_poweroff();
 568                 }
 569             }
 570         }
 571     }
 572 }
 573
 574 /*
 575  * Estimate how much current we are drawing just to run.
 576  */
 577 static int runcurrent(void)
 578 {
 579     int current;
 580
 581 #if MEM == 8 && !defined(HAVE_MMC)
 582     /* assuming 192 kbps, the running time is 22% longer with 8MB */
 583     current = (CURRENT_NORMAL*100/122);
 584 #else
 585     current = CURRENT_NORMAL;
 586 #endif /* MEM == 8 */
 587
 588     if(usb_inserted()
 589 #if defined(HAVE_USB_POWER)
 590   #if (CURRENT_USB < CURRENT_NORMAL)
 591        || usb_powered()
 592   #else
 593        && !usb_powered()
 594   #endif
 595 #endif
 596     )
 597     {
 598         current = CURRENT_USB;
 599     }
 600
 601 #if defined(HAVE_BACKLIGHT) && !defined(BOOTLOADER)
 602     if (backlight_get_current_timeout() == 0) /* LED always on */
 603         current += CURRENT_BACKLIGHT;
 604 #endif
 605
 606 #if defined(HAVE_RECORDING) && defined(CURRENT_RECORD)
 607     if (audio_status() & AUDIO_STATUS_RECORD)
 608         current += CURRENT_RECORD;
 609 #endif
 610
 611 #ifdef HAVE_SPDIF_POWER
 612     if (spdif_powered())
 613         current += CURRENT_SPDIF_OUT;
 614 #endif
 615
 616 #ifdef HAVE_REMOTE_LCD
 617     if (remote_detect())
 618         current += CURRENT_REMOTE;
 619 #endif
 620
 621     return(current);
 622 }
 623
 624
 625 /* Check to see whether or not we've received an alarm in the last second */
 626 #ifdef HAVE_RTC_ALARM
 627 static void power_thread_rtc_process(void)
 628 {
 629     if (rtc_check_alarm_flag()) {
 630         rtc_enable_alarm(false);
 631     }
 632 }
 633 #endif
 634
 635 /*
 636  * This function is called to do the relativly long sleep waits from within the
 637  * main power_thread loop while at the same time servicing any other periodic
 638  * functions in the power thread which need to be called at a faster periodic
 639  * rate than the slow periodic rate of the main power_thread loop.
 640  *
 641  * While we are waiting for the time to expire, we average the battery
 642  * voltages.
 643  */
 644 static void power_thread_sleep(int ticks)
 645 {
 646     int small_ticks;
 647
 648     while (ticks > 0) {
 649
 650 #if CONFIG_CHARGING
 651         /*
 652          * Detect charger plugged/unplugged transitions.  On a plugged or
 653          * unplugged event, we return immediately, run once through the main
 654          * loop (including the subroutines), and end up back here where we
 655          * transition to the appropriate steady state charger on/off state.
 656          */
 657         if(charger_inserted()
 658 #ifdef HAVE_USB_POWER /* USB powered or USB inserted both provide power */
 659                 || usb_powered()
 660 #if CONFIG_CHARGING
 661                 || (usb_inserted() && usb_charging_enabled())
 662 #endif
 663 #endif
 664                 ) {
 665             switch(charger_input_state) {
 666                 case NO_CHARGER:
 667                 case CHARGER_UNPLUGGED:
 668                     charger_input_state = CHARGER_PLUGGED;
 669                     return;
 670                 case CHARGER_PLUGGED:
 671                     queue_broadcast(SYS_CHARGER_CONNECTED, 0);
 672                     last_sent_battery_level = 0;
 673                     charger_input_state = CHARGER;
 674                     break;
 675                 case CHARGER:
 676                     break;
 677             }
 678         } else {    /* charger not inserted */
 679             switch(charger_input_state) {
 680                 case NO_CHARGER:
 681                     break;
 682                 case CHARGER_UNPLUGGED:
 683                     queue_broadcast(SYS_CHARGER_DISCONNECTED, 0);
 684                     last_sent_battery_level = 100;
 685                     charger_input_state = NO_CHARGER;
 686                     break;
 687                 case CHARGER_PLUGGED:
 688                 case CHARGER:
 689                     charger_input_state = CHARGER_UNPLUGGED;
 690                     return;
 691             }
 692         }
 693 #endif
 694 #if CONFIG_CHARGING == CHARGING_MONITOR
 695         switch (charger_input_state) {
 696             case CHARGER_UNPLUGGED:
 697             case NO_CHARGER:
 698                 charge_state = DISCHARGING;
 699                 break;
 700             case CHARGER_PLUGGED:
 701             case CHARGER:
 702                 if (charging_state()) {
 703                     charge_state = CHARGING;
 704                 } else {
 705                     charge_state = DISCHARGING;
 706                 }
 707                 break;
 708         }
 709
 710 #endif /* CONFIG_CHARGING == CHARGING_MONITOR */
 711
 712         small_ticks = MIN(HZ/2, ticks);
 713         sleep(small_ticks);
 714         ticks -= small_ticks;
 715
 716         /* If the power off timeout expires, the main thread has failed
 717            to shut down the system, and we need to force a power off */
 718         if(shutdown_timeout) {
 719             shutdown_timeout -= small_ticks;
 720             if(shutdown_timeout <= 0)
 721                 power_off();
 722         }
 723
 724 #ifdef HAVE_RTC_ALARM
 725         power_thread_rtc_process();
 726 #endif
 727
 728         /*
 729          * Do a digital exponential filter.  We don't sample the battery if
 730          * the disk is spinning unless we are in USB mode (the disk will most
 731          * likely always be spinning in USB mode).
 732          */
 733         if (!ata_disk_is_active() || usb_inserted()) {
 734             avgbat += battery_adc_voltage() - (avgbat / BATT_AVE_SAMPLES);
 735             /*
 736              * battery_millivolts is the millivolt-scaled filtered battery value.
 737              */
 738             battery_millivolts = avgbat / BATT_AVE_SAMPLES;
 739
 740             /* update battery status every time an update is available */
 741             battery_status_update();
 742         }
 743         else if (battery_percent < 8) {
 744             /* If battery is low, observe voltage during disk activity.
 745              * Shut down if voltage drops below shutoff level and we are not
 746              * using NiMH or Alkaline batteries.
 747              */
 748             battery_millivolts = (battery_adc_voltage() +
 749                                   battery_millivolts + 1) / 2;
 750
 751             /* update battery status every time an update is available */
 752             battery_status_update();
 753
 754 #ifndef NO_LOW_BATTERY_SHUTDOWN
 755             if (!shutdown_timeout &&
 756                 (battery_millivolts < battery_level_shutoff[battery_type]))
 757                 sys_poweroff();
 758             else
 759 #endif
 760                 avgbat += battery_millivolts - (avgbat / BATT_AVE_SAMPLES);
 761         }
 762
 763 #if CONFIG_CHARGING == CHARGING_CONTROL
 764         if (ata_disk_is_active()) {
 765             /* flag hdd use for charging calculation */
 766             disk_activity_last_cycle = true;
 767         }
 768 #endif
 769 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
 770         /*
 771          * If we have a lot of pending writes or if the disk is spining,
 772          * fsync the debug log file.
 773          */
 774         if((wrcount > 10) || ((wrcount > 0) && ata_disk_is_active())) {
 775             fsync(fd);
 776             wrcount = 0;
 777         }
 778 #endif
 779     }
 780 }
 781
 782
 783 /*
 784  * This power thread maintains a history of battery voltage
 785  * and implements a charging algorithm.
 786  * For a complete description of the charging algorithm read
 787  * docs/CHARGING_ALGORITHM.
 788  */
 789
 790 static void power_thread(void)
 791 {
 792 #if CONFIG_CHARGING == CHARGING_CONTROL
 793     int i;
 794     unsigned int target_voltage = TRICKLE_VOLTAGE;    /* desired topoff/trickle
 795                                        * voltage level */
 796     int charge_max_time_idle = 0;     /* max. charging duration, calculated at
 797                                        * beginning of charging */
 798     int charge_max_time_now = 0;      /* max. charging duration including
 799                                        * hdd activity */
 800     int minutes_disk_activity = 0;    /* count minutes of hdd use during
 801                                        * charging */
 802     int last_disk_activity = CHARGE_END_LONGD + 1; /* last hdd use x mins ago */
 803 #endif
 804
 805     /* initialize the voltages for the exponential filter */
 806     avgbat = battery_adc_voltage() + 15;
 807
 808 #ifndef HAVE_MMC  /* this adjustment is only needed for HD based */
 809         /* The battery voltage is usually a little lower directly after
 810            turning on, because the disk was used heavily. Raise it by 5% */
 811 #ifdef HAVE_CHARGING
 812     if(!charger_inserted()) /* only if charger not connected */
 813 #endif
 814         avgbat += (percent_to_volt_discharge[battery_type][6] -
 815                    percent_to_volt_discharge[battery_type][5]) / 2;
 816 #endif /* not HAVE_MMC */
 817
 818     avgbat = avgbat * BATT_AVE_SAMPLES;
 819     battery_millivolts = avgbat / BATT_AVE_SAMPLES;
 820
 821 #if CONFIG_CHARGING
 822     if(charger_inserted()) {
 823         battery_percent  = voltage_to_percent(battery_millivolts,
 824                            percent_to_volt_charge);
 825 #if defined(IRIVER_H100_SERIES) || defined(IRIVER_H300_SERIES)
 826         /* Checking for iriver is a temporary kludge. */
 827         charger_input_state = CHARGER;
 828 #endif
 829     } else
 830 #endif
 831     {   battery_percent  = voltage_to_percent(battery_millivolts,
 832                            percent_to_volt_discharge[battery_type]);
 833         battery_percent += (battery_percent < 100);
 834     }
 835
 836 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
 837     fd      = -1;
 838     wrcount = 0;
 839 #endif
 840
 841     while (1)
 842     {
 843         /* rotate the power history */
 844         memmove(power_history + 1, power_history,
 845                 sizeof(power_history) - sizeof(power_history[0]));
 846
 847         /* insert new value at the start, in millivolts 8-) */
 848         power_history[0] = battery_millivolts;
 849
 850 #if CONFIG_CHARGING == CHARGING_CONTROL
 851         if (charger_input_state == CHARGER_PLUGGED) {
 852             pid_p = 0;
 853             pid_i = 0;
 854             snprintf(power_message, POWER_MESSAGE_LEN, "Charger plugged in");
 855             /*
 856              * The charger was just plugged in.  If the battery level is
 857              * nearly charged, just trickle.  If the battery is low, start
 858              * a full charge cycle.  If the battery level is in between,
 859              * top-off and then trickle.
 860              */
 861             if(battery_percent > START_TOPOFF_CHG) {
 862                 powermgmt_last_cycle_level = battery_percent;
 863                 powermgmt_last_cycle_startstop_min = 0;
 864                 if(battery_percent >= START_TRICKLE_CHG) {
 865                     charge_state = TRICKLE;
 866                     target_voltage = TRICKLE_VOLTAGE;
 867                 } else {
 868                     charge_state = TOPOFF;
 869                     target_voltage = TOPOFF_VOLTAGE;
 870                 }
 871             } else {
 872                 /*
 873                  * Start the charger full strength
 874                  */
 875                 i = CHARGE_MAX_TIME_1500 * battery_capacity / 1500;
 876                 charge_max_time_idle =
 877                     i * (100 + 35 - battery_percent) / 100;
 878                 if (charge_max_time_idle > i) {
 879                     charge_max_time_idle = i;
 880                 }
 881                 charge_max_time_now = charge_max_time_idle;
 882
 883                 snprintf(power_message, POWER_MESSAGE_LEN,
 884                          "ChgAt %d%% max %dm", battery_level(),
 885                          charge_max_time_now);
 886
 887                 /* enable the charger after the max time calc is done,
 888                    because battery_level depends on if the charger is
 889                    on */
 890                 DEBUGF("power: charger inserted and battery"
 891                        " not full, charging\n");
 892                 powermgmt_last_cycle_level = battery_percent;
 893                 powermgmt_last_cycle_startstop_min = 0;
 894                 trickle_sec  = 60;
 895                 long_delta   = short_delta = 999999;
 896                 charge_state = CHARGING;
 897             }
 898         }
 899         if (charge_state == CHARGING) {
 900             /* alter charge time max length with extra disk use */
 901             if (disk_activity_last_cycle) {
 902                 minutes_disk_activity++;
 903                 charge_max_time_now = charge_max_time_idle +
 904                                      (minutes_disk_activity * 2 / 5);
 905                 disk_activity_last_cycle = false;
 906                 last_disk_activity = 0;
 907             } else {
 908                 last_disk_activity++;
 909             }
 910             /*
 911              * Check the delta voltage over the last X minutes so we can do
 912              * our end-of-charge logic based on the battery level change.
 913              *(no longer use minimum time as logic for charge end has 50
 914              * minutes minimum charge built in)
 915              */
 916             if (powermgmt_last_cycle_startstop_min > CHARGE_END_SHORTD) {
 917                 short_delta = power_history[0] -
 918                               power_history[CHARGE_END_SHORTD - 1];
 919             }
 920
 921             if (powermgmt_last_cycle_startstop_min > CHARGE_END_LONGD) {
 922             /*
 923              * Scan the history: the points where measurement is taken need to
 924              * be fairly static. (check prior to short delta 'area')
 925              * (also only check first and last 10 cycles - delta in middle OK)
 926              */
 927                 long_delta = power_history[0] -
 928                              power_history[CHARGE_END_LONGD - 1];
 929
 930                 for(i = CHARGE_END_SHORTD; i < CHARGE_END_SHORTD + 10; i++) {
 931                     if(((power_history[i] - power_history[i+1]) >  50) ||
 932                        ((power_history[i] - power_history[i+1]) < -50)) {
 933                         long_delta = 777777;
 934                         break;
 935                     }
 936                 }
 937                  for(i = CHARGE_END_LONGD - 11; i < CHARGE_END_LONGD - 1 ; i++) {
 938                     if(((power_history[i] - power_history[i+1]) >  50) ||
 939                        ((power_history[i] - power_history[i+1]) < -50)) {
 940                         long_delta = 888888;
 941                         break;
 942                     }
 943                 }
 944             }
 945
 946             snprintf(power_message, POWER_MESSAGE_LEN,
 947                      "Chg %dm, max %dm", powermgmt_last_cycle_startstop_min,
 948                      charge_max_time_now);
 949             /*
 950              * End of charge criteria (any qualify):
 951              * 1) Charged a long time
 952              * 2) DeltaV went negative for a short time ( & long delta static)
 953              * 3) DeltaV was negative over a longer period (no disk use only)
 954              * Note: short_delta and long_delta are millivolts
 955              */
 956             if ((powermgmt_last_cycle_startstop_min >= charge_max_time_now) ||
 957                 (short_delta <= -50 && long_delta < 50 ) || (long_delta  < -20 &&
 958                 last_disk_activity > CHARGE_END_LONGD)) {
 959                 if (powermgmt_last_cycle_startstop_min > charge_max_time_now) {
 960                     DEBUGF("power: powermgmt_last_cycle_startstop_min > charge_max_time_now, "
 961                            "enough!\n");
 962                     /*
 963                      *have charged too long and deltaV detection did not
 964                      *work!
 965                      */
 966                      snprintf(power_message, POWER_MESSAGE_LEN,
 967                              "Chg tmout %d min", charge_max_time_now);
 968                     /*
 969                      * Switch to trickle charging.  We skip the top-off
 970                      * since we've effectively done the top-off operation
 971                      * already since we charged for the maximum full
 972                      * charge time.
 973                      */
 974                     powermgmt_last_cycle_level = battery_percent;
 975                     powermgmt_last_cycle_startstop_min = 0;
 976                     charge_state = TRICKLE;
 977
 978                     /*
 979                      * set trickle charge target to a relative voltage instead
 980                      * of an arbitrary value - the fully charged voltage may
 981                      * vary according to ambient temp, battery condition etc
 982                      * trickle target is -0.15v from full voltage acheived
 983                      * topup target is -0.05v from full voltage
 984                      */
 985                     target_voltage = power_history[0] - 150;
 986
 987                 } else {
 988                     if(short_delta <= -5) {
 989                         DEBUGF("power: short-term negative"
 990                                " delta, enough!\n");
 991                         snprintf(power_message, POWER_MESSAGE_LEN,
 992                                  "end negd %d %dmin", short_delta,
 993                                  powermgmt_last_cycle_startstop_min);
 994                         target_voltage = power_history[CHARGE_END_SHORTD - 1]
 995                                          - 50;
 996                     } else {
 997                         DEBUGF("power: long-term small "
 998                                "positive delta, enough!\n");
 999                         snprintf(power_message, POWER_MESSAGE_LEN,
1000                                  "end lowd %d %dmin", long_delta,
1001                                  powermgmt_last_cycle_startstop_min);
1002                         target_voltage = power_history[CHARGE_END_LONGD - 1]
1003                                          - 50;
1004                     }
1005                     /*
1006                      * Switch to top-off charging.
1007                      */
1008                     powermgmt_last_cycle_level = battery_percent;
1009                     powermgmt_last_cycle_startstop_min = 0;
1010                     charge_state = TOPOFF;
1011                 }
1012             }
1013         }
1014         else if (charge_state != DISCHARGING)  /* top off or trickle */
1015         {
1016             /*
1017              *Time to switch from topoff to trickle?
1018              */
1019             if ((charge_state == TOPOFF) &&
1020                 (powermgmt_last_cycle_startstop_min > TOPOFF_MAX_TIME))
1021             {
1022                 powermgmt_last_cycle_level = battery_percent;
1023                 powermgmt_last_cycle_startstop_min = 0;
1024                 charge_state = TRICKLE;
1025                 target_voltage = target_voltage - 100;
1026             }
1027             /*
1028              * Adjust trickle charge time (proportional and integral terms).
1029              * Note: I considered setting the level higher if the USB is
1030              * plugged in, but it doesn't appear to be necessary and will
1031              * generate more heat [gvb].
1032              */
1033
1034             pid_p = ((signed)target_voltage - (signed)battery_millivolts) / 5;
1035             if((pid_p <= PID_DEADZONE) && (pid_p >= -PID_DEADZONE))
1036                 pid_p = 0;
1037
1038             if((unsigned) battery_millivolts < target_voltage) {
1039                 if(pid_i < 60) {
1040                     pid_i++;        /* limit so it doesn't "wind up" */
1041                 }
1042             } else {
1043                 if(pid_i > 0) {
1044                     pid_i--;        /* limit so it doesn't "wind up" */
1045                 }
1046             }
1047
1048             trickle_sec = pid_p + pid_i;
1049
1050             if(trickle_sec > 60) {
1051                 trickle_sec = 60;
1052             }
1053             if(trickle_sec < 0) {
1054                 trickle_sec = 0;
1055             }
1056
1057         } else if (charge_state == DISCHARGING) {
1058             trickle_sec = 0;
1059             /*
1060              * The charger is enabled here only in one case: if it was
1061              * turned on at boot time (power_init).  Turn it off now.
1062              */
1063             if (charger_enabled)
1064                 charger_enable(false);
1065         }
1066
1067         if (charger_input_state == CHARGER_UNPLUGGED) {
1068             /*
1069              * The charger was just unplugged.
1070              */
1071             DEBUGF("power: charger disconnected, disabling\n");
1072
1073             charger_enable(false);
1074             powermgmt_last_cycle_level = battery_percent;
1075             powermgmt_last_cycle_startstop_min = 0;
1076             trickle_sec  = 0;
1077             pid_p        = 0;
1078             pid_i        = 0;
1079             charge_state = DISCHARGING;
1080             snprintf(power_message, POWER_MESSAGE_LEN, "Charger: discharge");
1081         }
1082
1083 #endif /* CONFIG_CHARGING == CHARGING_CONTROL */
1084
1085         /* sleep for a minute */
1086
1087 #if CONFIG_CHARGING == CHARGING_CONTROL
1088         if(trickle_sec > 0) {
1089             charger_enable(true);
1090             power_thread_sleep(HZ * trickle_sec);
1091         }
1092         if(trickle_sec < 60)
1093             charger_enable(false);
1094         power_thread_sleep(HZ * (60 - trickle_sec));
1095 #else
1096         power_thread_sleep(HZ * 60);
1097 #endif
1098
1099 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
1100         if(usb_inserted()) {
1101             if(fd >= 0) {
1102                 /* It is probably too late to close the file but we can try...*/
1103                 close(fd);
1104                 fd = -1;
1105             }
1106         } else {
1107             if(fd < 0) {
1108                 fd = open(DEBUG_FILE_NAME, O_WRONLY | O_APPEND | O_CREAT);
1109                 if(fd >= 0) {
1110                     snprintf(debug_message, DEBUG_MESSAGE_LEN,
1111                     "cycle_min, bat_millivolts, bat_percent, chgr_state, charge_state, pid_p, pid_i, trickle_sec\n");
1112                     write(fd, debug_message, strlen(debug_message));
1113                     wrcount = 99;   /* force a flush */
1114                 }
1115             }
1116             if(fd >= 0) {
1117                 snprintf(debug_message, DEBUG_MESSAGE_LEN,
1118                         "%d, %d, %d, %d, %d, %d, %d, %d\n",
1119                     powermgmt_last_cycle_startstop_min, battery_millivolts,
1120                     battery_percent, charger_input_state, charge_state,
1121                     pid_p, pid_i, trickle_sec);
1122                 write(fd, debug_message, strlen(debug_message));
1123                 wrcount++;
1124             }
1125         }
1126 #endif
1127         handle_auto_poweroff();
1128
1129 #if CONFIG_CHARGING == CHARGING_CONTROL
1130         powermgmt_last_cycle_startstop_min++;
1131 #endif
1132     }
1133 }
1134
1135 void powermgmt_init(void)
1136 {
1137     /* init history to 0 */
1138     memset(power_history, 0x00, sizeof(power_history));
1139     create_thread(power_thread, power_stack, sizeof(power_stack), 0,
1140                   power_thread_name IF_PRIO(, PRIORITY_SYSTEM)
1141                           IF_COP(, CPU));
1142 }
1143
1144 #endif /* SIMULATOR */
1145
1146 void sys_poweroff(void)
1147 {
1148     logf("sys_poweroff()");
1149     /* If the main thread fails to shut down the system, we will force a
1150        power off after an 20 second timeout - 28 seconds if recording */
1151     if (shutdown_timeout == 0)
1152     {
1153 #if (defined(IAUDIO_X5) || defined(IAUDIO_M5)) && !defined (SIMULATOR)
1154         pcf50606_reset_timeout(); /* Reset timer on first attempt only */
1155 #endif
1156 #ifdef HAVE_RECORDING
1157         if (audio_status() & AUDIO_STATUS_RECORD)
1158             shutdown_timeout += HZ*8;
1159 #endif
1160         shutdown_timeout += HZ*20;
1161     }
1162
1163     queue_broadcast(SYS_POWEROFF, 0);
1164 }
1165
1166 void cancel_shutdown(void)
1167 {
1168     logf("sys_cancel_shutdown()");
1169
1170 #if (defined(IAUDIO_X5) || defined(IAUDIO_M5)) && !defined (SIMULATOR)
1171     /* TODO: Move some things to target/ tree */
1172     if (shutdown_timeout)
1173         pcf50606_reset_timeout();
1174 #endif
1175
1176     shutdown_timeout = 0;
1177 }
1178
1179 /* Various hardware housekeeping tasks relating to shutting down the jukebox */
1180 void shutdown_hw(void)
1181 {
1182 #ifndef SIMULATOR
1183 #if defined(DEBUG_FILE) && (CONFIG_CHARGING == CHARGING_CONTROL)
1184     if(fd >= 0) {
1185         close(fd);
1186         fd = -1;
1187     }
1188 #endif
1189     audio_stop();
1190     if (battery_level_safe()) { /* do not save on critical battery */
1191 #ifdef HAVE_LCD_BITMAP
1192         glyph_cache_save();
1193 #endif
1194         if(ata_disk_is_active())
1195             ata_spindown(1);
1196     }
1197     while(ata_disk_is_active())
1198         sleep(HZ/10);
1199
1200 #if CONFIG_CODEC != SWCODEC
1201     mp3_shutdown();
1202 #else
1203     audiohw_close();
1204 #endif
1205
1206     /* If HD is still active we try to wait for spindown, otherwise the
1207        shutdown_timeout in power_thread_sleep will force a power off */
1208     while(ata_disk_is_active())
1209         sleep(HZ/10);
1210 #ifndef IAUDIO_X5
1211     lcd_set_contrast(0);
1212 #endif /* IAUDIO_X5 */
1213 #ifdef HAVE_REMOTE_LCD
1214     lcd_remote_set_contrast(0);
1215 #endif
1216
1217 #ifdef HAVE_LCD_SHUTDOWN
1218     lcd_shutdown();
1219 #endif
1220
1221     /* Small delay to make sure all HW gets time to flush. Especially
1222        eeprom chips are quite slow and might be still writing the last
1223        byte. */
1224     sleep(HZ/4);
1225     power_off();
1226 #endif /* #ifndef SIMULATOR */
1227 }
1228
1229 /* Send system battery level update events on reaching certain significant
1230    levels.  This must be called after battery_percent has been updated. */
1231 static void send_battery_level_event(void)
1232 {
1233     static const int levels[] = { 5, 15, 30, 50, 0 };
1234     const int *level = levels;
1235     while (*level)
1236     {
1237         if (battery_percent <= *level && last_sent_battery_level > *level)
1238         {
1239             last_sent_battery_level = *level;
1240             queue_broadcast(SYS_BATTERY_UPDATE, last_sent_battery_level);
1241             break;
1242         }
1243         level++;
1244     }
1245 }