/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2002 by Heikki Hannikainen * * All files in this archive are subject to the GNU General Public License. * See the file COPYING in the source tree root for full license agreement. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "config.h" #include "sh7034.h" #include "kernel.h" #include "thread.h" #include "system.h" #include "debug.h" #include "panic.h" #include "adc.h" #include "string.h" #include "sprintf.h" #include "ata.h" #include "power.h" #include "button.h" #include "ata.h" #include "mpeg.h" #include "usb.h" #include "powermgmt.h" #ifdef SIMULATOR int battery_level(void) { return 100; } int battery_time(void) { return 500; } bool battery_level_safe(void) { return true; } void set_poweroff_timeout(int timeout) { (void)timeout; } #else /* not SIMULATOR */ static int poweroff_idle_timeout_value[15] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 30, 45, 60 }; static int percent_to_volt_nocharge[11] = /* voltages (centivolt) of 0%, 10%, ... 100% when charging disabled */ { 450, 481, 491, 497, 503, 507, 512, 514, 517, 528, 560 }; #ifdef HAVE_CHARGE_CTRL static int percent_to_volt_charge[11] = /* voltages (centivolt) of 0%, 10%, ... 100% when charging enabled */ { 476, 544, 551, 556, 561, 564, 566, 576, 582, 584, 585 }; #endif int battery_lazyness[20] = /* how does the battery react when plugging in/out the charger */ { 0, 17, 31, 42, 52, 60, 67, 72, 77, 81, 84, 87, 89, 91, 92, 94, 95, 95, 96, 97 }; static char power_stack[DEFAULT_STACK_SIZE]; static char power_thread_name[] = "power"; static int poweroff_timeout = 0; static long last_charge_time = 0; static int powermgmt_est_runningtime_min = -1; static bool sleeptimer_active = false; static unsigned long sleeptimer_endtick; unsigned short power_history[POWER_HISTORY_LEN]; #ifdef HAVE_CHARGE_CTRL char power_message[POWER_MESSAGE_LEN] = ""; char charge_restart_level = CHARGE_RESTART_HI; int powermgmt_last_cycle_startstop_min = 20; /* how many minutes ago was the charging started or stopped? */ int powermgmt_last_cycle_level = 0; /* which level had the batteries at this time? */ #endif int battery_time(void) { return powermgmt_est_runningtime_min; } /* look into the percent_to_volt_* table and get a realistic battery level percentage */ int voltage_to_percent(int voltage, int* table) { if (voltage <= table[0]) return 0; else if (voltage >= table[10]) return 100; else { /* search nearest value */ int i = 0; while ((i < 10) && (table[i+1] < voltage)) i++; /* interpolate linear between the smaller and greater value */ return i * 10 /* 10th */ + (voltage - table[i]) * 10 / (table[i+1] - table[i]); /* 1th */ } } /* Returns battery level in percent */ int battery_level(void) { int level = 0; int c = 0; int i; /* calculate average over last 3 minutes (skip empty samples) */ for (i = 0; i < 3; i++) if (power_history[POWER_HISTORY_LEN-1-i]) { level += power_history[POWER_HISTORY_LEN-1-i]; c++; } if (c) level = level / c; /* avg */ else /* history was empty, get a fresh sample */ level = (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) / 10000; if(level > BATTERY_LEVEL_FULL) level = BATTERY_LEVEL_FULL; if(level < BATTERY_LEVEL_EMPTY) level = BATTERY_LEVEL_EMPTY; /* level now stores the voltage in centivolts */ /* let's calculate a percentage now with using the voltage arrays */ #ifdef HAVE_CHARGE_CTRL if (powermgmt_last_cycle_startstop_min < 20) { /* the batteries are lazy, so take a value between the result of the two table lookups */ if (charger_enabled) level = (voltage_to_percent(level, percent_to_volt_charge) * battery_lazyness[powermgmt_last_cycle_startstop_min] + voltage_to_percent(level, percent_to_volt_nocharge) * (100 - battery_lazyness[powermgmt_last_cycle_startstop_min])) / 100; else level = (voltage_to_percent(level, percent_to_volt_nocharge) * battery_lazyness[powermgmt_last_cycle_startstop_min] + voltage_to_percent(level, percent_to_volt_charge) * (100 - battery_lazyness[powermgmt_last_cycle_startstop_min])) / 100; } else { if (charger_enabled) level = voltage_to_percent(level, percent_to_volt_charge); else level = voltage_to_percent(level, percent_to_volt_nocharge); } #else level = voltage_to_percent(level, percent_to_volt_nocharge); /* always use the nocharge table */ #endif return level; } /* Tells if the battery level is safe for disk writes */ bool battery_level_safe(void) { /* I'm pretty sure we don't want an average over a long time here */ if (power_history[POWER_HISTORY_LEN-1]) return power_history[POWER_HISTORY_LEN-1] > BATTERY_LEVEL_DANGEROUS; else return adc_read(ADC_UNREG_POWER) > (BATTERY_LEVEL_DANGEROUS * 10000) / BATTERY_SCALE_FACTOR; } void set_poweroff_timeout(int timeout) { poweroff_timeout = timeout; } void set_sleep_timer(int seconds) { if(seconds) { sleeptimer_active = true; sleeptimer_endtick = current_tick + seconds * HZ; } else { sleeptimer_active = false; sleeptimer_endtick = 0; } } int get_sleep_timer(void) { if(sleeptimer_active) return (sleeptimer_endtick - current_tick) / HZ; else return 0; } /* We shut off in the following cases: 1) The unit is idle, not playing music 2) The unit is playing music, but is paused We do not shut off in the following cases: 1) The USB is connected 2) The charger is connected 3) We are recording, or recording with pause */ static void handle_auto_poweroff(void) { long timeout = poweroff_idle_timeout_value[poweroff_timeout]*60*HZ; int mpeg_stat = mpeg_status(); bool charger_is_inserted = charger_inserted(); static bool charger_was_inserted = false; /* The was_inserted thing prevents the unit to shut down immediately when the charger is extracted */ if(charger_is_inserted || charger_was_inserted) { last_charge_time = current_tick; } charger_was_inserted = charger_is_inserted; if(timeout && !usb_inserted() && (mpeg_stat == 0 || mpeg_stat == (MPEG_STATUS_PLAY | MPEG_STATUS_PAUSE))) { if(TIME_AFTER(current_tick, last_keypress + timeout) && TIME_AFTER(current_tick, last_disk_activity + timeout) && TIME_AFTER(current_tick, last_charge_time + timeout)) power_off(); } else { /* Handle sleeptimer */ if(sleeptimer_endtick && !usb_inserted()) { if(TIME_AFTER(current_tick, sleeptimer_endtick)) { if(charger_is_inserted) { DEBUGF("Sleep timer timeout. Rebooting...\n"); system_reboot(); } else { DEBUGF("Sleep timer timeout. Shutting off...\n"); power_off(); } } } } } /* * This power thread maintains a history of battery voltage * and implements a charging algorithm. * Battery 'fullness' can be determined by the voltage drop, see: * * http://www.nimhbattery.com/nimhbattery-faq.htm questions 3 & 4 * http://www.powerpacks-uk.com/Charging%20NiMh%20Batteries.htm * http://www.angelfire.com/electronic/hayles/charge1.html (soft start idea) * http://www.powerstream.com/NiMH.htm (discouraging) * http://www.panasonic.com/industrial/battery/oem/images/pdf/nimhchar.pdf * http://www.duracell.com/oem/Pdf/others/nimh_5.pdf (discharging) * http://www.duracell.com/oem/Pdf/others/nimh_6.pdf (charging) * * Charging logic which we're starting with (by Linus, Hes, Bagder): * * 1) max 16 hrs charge time (just in negative delta detection fails) * 2) Stop at negative delta of 5 mins * 3) Stop at 15 mins of zero-delta or below * 4) minimum of 15 mins charge time before 2) is applied * 5) after end of charging, wait for charge go down 80% * before charging again if in 'no-use overnight charging mode' * and down to 10% if in 'fixed-location mains-powered usage mode' */ static void power_thread(void) { int i; int avg, ok_samples, spin_samples; #ifdef HAVE_CHARGE_CTRL int delta; int charged_time = 0; int charge_max_time_now = 0; int charge_pause = 0; /* no charging pause at the beginning */ #endif while (1) { /* Make POWER_AVG measurements and calculate an average of that to * reduce the effect of backlights/disk spinning/other variation. */ ok_samples = spin_samples = avg = 0; for (i = 0; i < POWER_AVG_N; i++) { if (ata_disk_is_active()) { if (!ok_samples) { /* if we don't have any good non-disk-spinning samples, * we take a sample anyway in case the disk is going * to spin all the time. */ avg += adc_read(ADC_UNREG_POWER); spin_samples++; } } else { if (spin_samples) /* throw away disk-spinning samples */ spin_samples = avg = 0; avg += adc_read(ADC_UNREG_POWER); ok_samples++; } sleep(HZ*POWER_AVG_SLEEP); } avg = avg / ((ok_samples) ? ok_samples : spin_samples); /* rotate the power history */ for (i = 0; i < POWER_HISTORY_LEN-1; i++) power_history[i] = power_history[i+1]; /* insert new value in the end, in centivolts 8-) */ power_history[POWER_HISTORY_LEN-1] = (avg * BATTERY_SCALE_FACTOR) / 10000; /* calculate estimated remaining running time */ /* not charging: remaining running time */ /* charging: remaining charging time */ #ifdef HAVE_CHARGE_CTRL if (charger_enabled) /* if taking the nocharge battery level, charging lasts 30% longer than the value says */ /* so consider it because there's the battery lazyness inside the the battery_level */ if (powermgmt_last_cycle_startstop_min < 20) { i = (100 - battery_lazyness[powermgmt_last_cycle_startstop_min]) * 30 / 100 ; /* 0..30 */ powermgmt_est_runningtime_min = (100 - battery_level()) * BATTERY_CAPACITY / 100 * (100 + i) / 100 * 60 / CURRENT_CHARGING; } else { powermgmt_est_runningtime_min = (100 - battery_level()) * BATTERY_CAPACITY / 100 * 60 / CURRENT_CHARGING; } else #endif powermgmt_est_runningtime_min = battery_level() * BATTERY_CAPACITY / 100 * 60 / CURRENT_NORMAL; #ifdef HAVE_CHARGE_CTRL if (charge_pause > 0) charge_pause--; if (charger_inserted()) { if (charger_enabled) { /* charger inserted and enabled */ charged_time++; snprintf(power_message, POWER_MESSAGE_LEN, "Chg %dm max %dm", charged_time, charge_max_time_now); if (charged_time > charge_max_time_now) { DEBUGF("power: charged_time > charge_max_time_now, enough!\n"); /* have charged too long and deltaV detection did not work! */ powermgmt_last_cycle_level = battery_level(); powermgmt_last_cycle_startstop_min = 0; charger_enable(false); snprintf(power_message, POWER_MESSAGE_LEN, "Chg tmout %d min", charge_max_time_now); /* disable charging for several hours from this point, just to be sure */ charge_pause = CHARGE_PAUSE_LEN; } else { if (charged_time > CHARGE_MIN_TIME) { /* have charged continuously over the minimum charging time, * so we monitor for deltaV going negative. Multiply things * by 100 to get more accuracy without floating point arithmetic. * power_history[] contains centivolts so after multiplying by 100 * the deltas are in tenths of millivolts (delta of 5 is * 0.0005 V). */ delta = ( power_history[POWER_HISTORY_LEN-1] * 100 + power_history[POWER_HISTORY_LEN-2] * 100 - power_history[POWER_HISTORY_LEN-1-CHARGE_END_NEGD+1] * 100 - power_history[POWER_HISTORY_LEN-1-CHARGE_END_NEGD] * 100 ) / CHARGE_END_NEGD / 2; if (delta < -100) { /* delta < -10 mV */ DEBUGF("power: short-term negative delta, enough!\n"); powermgmt_last_cycle_level = battery_level(); powermgmt_last_cycle_startstop_min = 0; charger_enable(false); snprintf(power_message, POWER_MESSAGE_LEN, "end negd %d %dmin", delta, charged_time); /* disable charging for several hours from this point, just to be sure */ charge_pause = CHARGE_PAUSE_LEN; } else { /* if we didn't disable the charger in the previous test, check for low positive delta */ delta = ( power_history[POWER_HISTORY_LEN-1] * 100 + power_history[POWER_HISTORY_LEN-2] * 100 - power_history[POWER_HISTORY_LEN-1-CHARGE_END_ZEROD+1] * 100 - power_history[POWER_HISTORY_LEN-1-CHARGE_END_ZEROD] * 100 ) / CHARGE_END_ZEROD / 2; if (delta < 1) { /* delta < 0.1 mV */ DEBUGF("power: long-term small positive delta, enough!\n"); powermgmt_last_cycle_level = battery_level(); powermgmt_last_cycle_startstop_min = 0; charger_enable(false); snprintf(power_message, POWER_MESSAGE_LEN, "end lowd %d %dmin", delta, charged_time); /* disable charging for several hours from this point, just to be sure */ charge_pause = CHARGE_PAUSE_LEN; } } } } } else { /* charged inserted but not enabled */ /* if battery is not full, enable charging */ if (battery_level() < charge_restart_level) { if (charge_pause) { DEBUGF("power: batt level < restart level, but charge pause, not enabling\n"); snprintf(power_message, POWER_MESSAGE_LEN, "chg pause %d min", charge_pause); } else { /* calculate max charge time depending on current battery level */ /* take 20% more because battery level is not linear */ charge_max_time_now = CHARGE_MAX_TIME * (100 + 30 - battery_level()) / 100; if (charge_max_time_now > CHARGE_MAX_TIME) { charge_max_time_now = CHARGE_MAX_TIME; } snprintf(power_message, POWER_MESSAGE_LEN, "ChgAt %d%% max %dm", battery_level(), charge_max_time_now); /* enable the charger after the max time calc is done, because battery_level */ /* depends on if the charger is on */ DEBUGF("power: charger inserted and battery not full, enabling\n"); powermgmt_last_cycle_level = battery_level(); powermgmt_last_cycle_startstop_min = 0; charged_time = 0; charger_enable(true); /* clear the power history so that we don't use values before * discharge for the long-term delta */ for (i = 0; i < POWER_HISTORY_LEN-1; i++) power_history[i] = power_history[POWER_HISTORY_LEN-1]; } } } } else { /* charger not inserted */ if (charger_enabled) { /* charger not inserted but was enabled */ DEBUGF("power: charger disconnected, disabling\n"); powermgmt_last_cycle_level = battery_level(); powermgmt_last_cycle_startstop_min = 0; charger_enable(false); snprintf(power_message, POWER_MESSAGE_LEN, "Charger disc"); } /* charger not inserted and disabled, so we're discharging */ } powermgmt_last_cycle_startstop_min++; #endif /* HAVE_CHARGE_CTRL*/ /* sleep for roughly a minute */ sleep(HZ*(60 - POWER_AVG_N * POWER_AVG_SLEEP)); handle_auto_poweroff(); } } void power_init(void) { /* init history to 0 */ memset(power_history, 0x00, sizeof(power_history)); /* initialize the history with a single sample to prevent level flickering during the first minute of execution */ power_history[POWER_HISTORY_LEN-1] = (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) / 10000; /* calculate the remaining time to that the info screen displays something useful */ powermgmt_est_runningtime_min = battery_level() * BATTERY_CAPACITY / 100 * 60 / CURRENT_NORMAL; #ifdef HAVE_CHARGE_CTRL snprintf(power_message, POWER_MESSAGE_LEN, "Powermgmt started"); #endif create_thread(power_thread, power_stack, sizeof(power_stack), power_thread_name); } #endif /* SIMULATOR */