1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (c) 2008 by Michael Sevakis
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
27 #include "powermgmt.h"
29 #include "power-gigabeat-s.h"
31 const unsigned short battery_level_dangerous
[BATTERY_TYPES_COUNT
] =
36 const unsigned short battery_level_shutoff
[BATTERY_TYPES_COUNT
] =
41 /* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
42 const unsigned short percent_to_volt_discharge
[BATTERY_TYPES_COUNT
][11] =
44 /* Toshiba Gigabeat S Li Ion 700mAH figured from discharge curve */
45 { 3659, 3719, 3745, 3761, 3785, 3813, 3856, 3926, 3984, 4040, 4121 },
48 /* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
49 const unsigned short percent_to_volt_charge
[11] =
51 /* Toshiba Gigabeat S Li Ion 700mAH figured from charge curve */
52 4028, 4063, 4087, 4111, 4135, 4156, 4173, 4185, 4194, 4202, 4208
55 /* Returns battery voltage from ADC [millivolts] */
56 unsigned int battery_adc_voltage(void)
58 /* ADC reading 0-1023 = 2400mV-4700mV */
59 return ((adc_read(ADC_BATTERY
) * 2303) >> 10) + 2400;
62 /* Returns the application supply voltage from ADC [millvolts] */
63 unsigned int application_supply_adc_voltage(void)
65 return ((adc_read(ADC_APPLICATION_SUPPLY
) * 2303) >> 10) + 2400;
68 unsigned int chrgraw_adc_voltage(void)
70 return (adc_read(ADC_CHARGER_VOLTAGE
) * 23023) >> 10;
73 /* Returns battery charge current from ADC [milliamps] */
74 int battery_adc_charge_current(void)
76 /* Positive reading = charger to battery
77 * Negative reading = battery to charger terminal
78 * ADC reading -512-511 = -2875mA-2875mA */
79 unsigned int value
= adc_read(ADC_CHARGER_CURRENT
);
82 if (value
== ADC_READ_ERROR
)
85 I
= ((((int32_t)value
<< 22) >> 22) * 2881) >> 9;
86 return ILEVEL_ADJUST_IN(I
);
89 /* Estimate power dissipation in the charge path regulator in mW. */
90 unsigned int cccv_regulator_dissipation(void)
92 /* BATTISNS is shorted to BATT so we don't need to use the
93 * battery current reading. */
94 int chrgraw
= (adc_read(ADC_CHARGER_VOLTAGE
) * 230225) >> 10;
95 int batt
= ((adc_read(ADC_BATTERY
) * 23023) >> 10) + 24000;
96 int ichrgsn
= adc_read(ADC_CHARGER_CURRENT
);
97 ichrgsn
= ((((int32_t)ichrgsn
<< 22) >> 22) * 2881) >> 9;
98 ichrgsn
= abs(ichrgsn
);
100 return (chrgraw
- ichrgsn
- batt
)*ILEVEL_ADJUST_IN(ichrgsn
) / 10000;
103 /* Returns battery temperature from ADC [deg-C] */
104 int battery_adc_temp(void)
106 /* E[volts] = value * 2.3V / 1023
107 * R[ohms] = E/I = E[volts] / 0.00002[A] (Thermistor bias current source)
109 * Steinhart-Hart thermistor equation:
110 * [A + B*ln(R) + D*ln^3(R)] = 1 / T[°K]
112 * Coeffients that fit experimental data (one thermistor so far, one run):
113 * A = 0.0013002631685462800
114 * B = 0.0002000841932612330
115 * D = 0.0000000640446750919
117 static const unsigned short ntc_table
[] =
119 #if 0 /* These have degree deltas > 1 (except the final two) so leave them
120 * out. 70 deg C upper limit is quite sufficient. */
121 0, /* INF */ 1, /* 171 */ 2, /* 145 */ 3, /* 130 */
122 4, /* 121 */ 5, /* 114 */ 6, /* 108 */ 7, /* 104 */
123 8, /* 100 */ 9, /* 96 */ 10, /* 93 */ 11, /* 91 */
124 12, /* 88 */ 13, /* 86 */ 14, /* 84 */ 15, /* 82 */
125 16, /* 81 */ 17, /* 79 */ 18, /* 78 */ 19, /* 76 */
126 20, /* 75 */ 21, /* 74 */ 22, /* 72 */ 23, /* 71 */
128 24, /* 70 */ 25, /* 69 */ 26, /* 68 */ 27, /* 67 */
129 28, /* 66 */ 30, /* 65 */ 31, /* 64 */ 32, /* 63 */
130 33, /* 62 */ 35, /* 61 */ 36, /* 60 */ 38, /* 59 */
131 39, /* 58 */ 41, /* 57 */ 43, /* 56 */ 45, /* 55 */
132 47, /* 54 */ 49, /* 53 */ 51, /* 52 */ 53, /* 51 */
133 56, /* 50 */ 58, /* 49 */ 61, /* 48 */ 63, /* 47 */
134 66, /* 46 */ 69, /* 45 */ 73, /* 44 */ 76, /* 43 */
135 80, /* 42 */ 83, /* 41 */ 87, /* 40 */ 92, /* 39 */
136 96, /* 38 */ 101, /* 37 */ 106, /* 36 */ 111, /* 35 */
137 116, /* 34 */ 122, /* 33 */ 128, /* 32 */ 135, /* 31 */
138 142, /* 30 */ 149, /* 29 */ 156, /* 28 */ 164, /* 27 */
139 173, /* 26 */ 182, /* 25 */ 192, /* 24 */ 202, /* 23 */
140 212, /* 22 */ 224, /* 21 */ 236, /* 20 */ 249, /* 19 */
141 262, /* 18 */ 277, /* 17 */ 292, /* 16 */ 308, /* 15 */
142 325, /* 14 */ 344, /* 13 */ 363, /* 12 */ 384, /* 11 */
143 406, /* 10 */ 429, /* 9 */ 454, /* 8 */ 480, /* 7 */
144 509, /* 6 */ 539, /* 5 */ 571, /* 4 */ 605, /* 3 */
145 641, /* 2 */ 680, /* 1 */ 722, /* 0 */ 766, /* -1 */
146 813, /* -2 */ 864, /* -3 */ 918, /* -4 */ 976, /* -5 */
149 unsigned int value
= adc_read(ADC_BATTERY_TEMP
);
155 for (i
= 1; i
< ARRAYLEN(ntc_table
); i
++)
157 if (ntc_table
[i
] > value
)
167 /** Charger control **/
169 /* All code has a preference for the main charger being connected over
170 * USB. USB is considered in the algorithm only if it is the sole source. */
171 static uint32_t int_sense0
= 0; /* Interrupt Sense 0 bits */
172 static unsigned int last_inputs
= POWER_INPUT_NONE
; /* Detect input changes */
173 static int charger_total_timer
= 0; /* Total allowed charging time */
174 static int icharger_ave
= 0; /* Filtered charging current */
175 static bool charger_close
= false; /* Shutdown notification */
176 static bool service_wdt
= true; /* Service the watchdog timer, if things
177 go very wrong, cease and shut down. */
178 static uint32_t charger_setting
= 0; /* Current ICHRG and VCHRG regulator
179 * setting (register bits) */
180 #define CHARGER_ADJUST ((uint32_t)-1)/* Force change in regulator setting */
181 static int autorecharge_counter
= 0 ; /* Battery < threshold debounce */
182 static int chgcurr_timer
= 0; /* Countdown to CHGCURR error */
183 #define AUTORECHARGE_COUNTDOWN (10*2) /* 10s debounce */
184 #define WATCHDOG_TIMEOUT (10*2) /* If not serviced, poweroff in 10s */
185 #define CHGCURR_TIMEOUT (4*2) /* 4s debounce */
187 /* Temperature monitoring */
190 TEMP_STATE_NORMAL
= 0, /* Within range */
191 TEMP_STATE_WAIT
= 1, /* Went out of range, wait to come back */
192 TEMP_LOW_LIMIT
= 0, /* Min temp */
193 TEMP_HIGH_LIMIT
= 1, /* Max temp */
194 } temp_state
= TEMP_STATE_NORMAL
;
196 /* Set power thread priority for charging mode or not */
197 static inline void charging_set_thread_priority(bool charging
)
199 #ifdef HAVE_PRIORITY_SCHEDULING
200 thread_set_priority(THREAD_ID_CURRENT
,
201 charging
? PRIORITY_REALTIME
: PRIORITY_SYSTEM
);
206 /* Update filtered charger current - exponential moving average */
207 static bool charger_current_filter_step(void)
209 int value
= battery_adc_charge_current();
211 if (value
== ADC_READ_ERROR
)
214 icharger_ave
+= value
- (icharger_ave
/ ICHARGER_AVE_SAMPLES
);
218 /* Return true if the main charger is connected. */
219 static bool main_charger_connected(void)
221 return (last_inputs
&
222 POWER_INPUT_MAIN_CHARGER
&
223 POWER_INPUT_CHARGER
) != 0;
226 /* Return the voltage level which should automatically trigger
227 * another recharge cycle based upon which power source is available.
228 * Assumes at least one is. */
229 static unsigned int auto_recharge_voltage(void)
231 if (main_charger_connected())
232 return BATT_VAUTO_RECHARGE
;
234 return BATT_USB_VAUTO_RECHARGE
;
237 /* Return greater of supply (BP) or filtered battery voltage. */
238 unsigned int input_millivolts(void)
240 unsigned int app_millivolts
= application_supply_adc_voltage();
241 unsigned int bat_millivolts
= battery_voltage();
243 return MAX(app_millivolts
, bat_millivolts
);
246 /* Get smoothed readings for initializing filtered data. */
247 static int stat_battery_reading(int type
)
249 int high
= INT_MIN
, low
= INT_MAX
;
253 for (i
= 0; i
< 7; i
++)
255 int reading
= ADC_READ_ERROR
;
257 sleep(2); /* Get unique readings */
262 reading
= battery_adc_voltage();
265 case ADC_CHARGER_CURRENT
:
266 reading
= battery_adc_charge_current();
270 if (reading
== ADC_READ_ERROR
)
282 /* Discard extremes */
283 return (value
- high
- low
) / 5;
286 /* Update filtered battery voltage instead of waiting for filter
288 static bool update_filtered_battery_voltage(void)
290 int millivolts
= stat_battery_reading(ADC_BATTERY
);
292 if (millivolts
!= INT_MIN
)
294 reset_battery_filter(millivolts
);
301 /* Sets the charge current limit based upon state. charge_state should be
302 * set before calling. */
303 static bool adjust_charger_current(void)
305 static const uint8_t charger_bits
[][2] =
309 /* These are actually zeros but reflect this setting */
310 MC13783_ICHRG_0MA
| MC13783_VCHRG_4_050V
,
311 MC13783_ICHRG_0MA
| MC13783_VCHRG_4_050V
,
313 /* Main(+USB): Charge slowly from the adapter until voltage is
314 * sufficient for normal charging.
316 * USB: The truth is that things will probably not make it this far.
317 * Cover the case, just in case the disk isn't used and it is
321 BATTERY_ITRICKLE
| BATTERY_VCHARGING
,
322 BATTERY_ITRICKLE_USB
| BATTERY_VCHARGING
326 BATTERY_IFAST
| BATTERY_VCHARGING
,
327 BATTERY_IFAST_USB
| BATTERY_VCHARGING
331 BATTERY_IFAST
| BATTERY_VCHARGING
,
332 BATTERY_IFAST_USB
| BATTERY_VCHARGING
334 /* Must maintain battery when on USB power only - utterly nasty
335 * but true and something retailos does (it will even end up charging
336 * the battery but not reporting that it is doing so).
337 * Float lower than MAX - could end up slightly discharging after
338 * a full charge but this is safer than maxing it out. */
341 BATTERY_IFLOAT_USB
| BATTERY_VFLOAT_USB
,
342 BATTERY_IMAINTAIN_USB
| BATTERY_VMAINTAIN_USB
345 /* Slower settings to so that the linear regulator doesn't dissipate
346 * an excessive amount of power when coming out of precharge state. */
349 BATTERY_ISLOW
| BATTERY_VCHARGING
,
350 BATTERY_ISLOW_USB
| BATTEYR_VCHARGING
355 bool success
= false;
359 usb_select
= ((last_inputs
& POWER_INPUT
) == POWER_INPUT_USB
)
362 if (charge_state
== DISCHARGING
&& usb_select
== 1)
364 /* USB-only, DISCHARGING, = maintaining battery */
365 int select
= (last_inputs
& POWER_INPUT_CHARGER
) ? 0 : 1;
366 charger_setting
= charger_bits
[CHARGING
+1][select
];
370 /* Take very good care not to write garbage. */
371 int state
= charge_state
;
373 if (state
< DISCHARGING
|| state
> CHARGING
)
376 charger_setting
= charger_bits
[state
][usb_select
];
379 if (charger_setting
!= 0)
381 if ((charger_setting
& MC13783_VCHRG
) > BATTERY_VCHARGING
||
382 (charger_setting
& MC13783_ICHRG
) > BATTERY_IFAST
)
384 /* Table is corrupted somehow. We shouldn't run at all.
386 * Explanation: On two occasions, even though this driver monitors
387 * the regulator register settings on each step and
388 * ensures that only valid table indexes are used,
389 * the current and voltage seem to be misregulated,
390 * resulting in excessively high battery voltage that
391 * will trip the battery protection. After careful
392 * review it seems that two possibilities exist:
393 * This code or data got trashed at some point or
394 * there really is a hardware bug of some sort. So
395 * far the cause is unknown. Voltage is also
396 * monitored in the CHARGING case for that reason.
397 * The solution for data or code corruption is to
398 * just panic and refuse to run the device. The
399 * solution for overvoltage due to hardware bug is to
400 * disable the charging. The action taken will reveal
401 * the true cause, thus _who_ is responsible.
402 * "Burning lithium is baaaad", so sayeth The Council
403 * of Seven Ascended Masters. */
404 charge_state
= CHARGE_STATE_DISABLED
;
409 /* Turn on 5K pulldown. */
410 i
= mc13783_set(MC13783_CHARGER
, MC13783_CHRGRAWPDEN
);
412 if (i
!= MC13783_DATA_ERROR
)
414 charging_set_thread_priority(true);
416 /* Turn regulator logically ON. Hardware may still override.
418 i
= mc13783_write_masked(MC13783_CHARGER
, charger_setting
,
419 MC13783_ICHRG
| MC13783_VCHRG
);
421 if (i
!= MC13783_DATA_ERROR
)
425 /* Enable charge current conversion */
426 adc_enable_channel(ADC_CHARGER_CURRENT
, true);
428 /* Charge path regulator turn on takes ~100ms max. */
431 icharger
= stat_battery_reading(ADC_CHARGER_CURRENT
);
433 if (icharger
!= INT_MIN
)
435 icharger_ave
= icharger
* ICHARGER_AVE_SAMPLES
;
437 if (update_filtered_battery_voltage())
443 /* Force regulator OFF. */
444 charge_state
= CHARGE_STATE_ERROR
;
448 /* Turn regulator OFF. */
450 i
= mc13783_write_masked(MC13783_CHARGER
,
451 MC13783_ICHRG_0MA
| MC13783_VCHRG_4_050V
,
452 MC13783_ICHRG
| MC13783_VCHRG
|
453 MC13783_CHRGRAWPDEN
);
455 if (MC13783_DATA_ERROR
== i
)
457 /* Failed. Force poweroff by not servicing the watchdog. */
460 else if (0 == charger_setting
)
462 /* Here because OFF was requested state */
468 adc_enable_channel(ADC_CHARGER_CURRENT
, false);
469 update_filtered_battery_voltage();
470 charging_set_thread_priority(false);
475 /* Stop the charger - if USB only then the regulator will not really be
476 * turned off. ERROR or DISABLED will turn it off however. */
477 static void stop_charger(void)
479 charger_total_timer
= 0;
481 if (charge_state
> DISCHARGING
)
482 charge_state
= DISCHARGING
;
484 adjust_charger_current();
487 /* Return OK if it is acceptable to start the regulator. */
488 static bool charging_ok(void)
490 bool ok
= charge_state
>= DISCHARGING
; /* Not an error condition? */
494 /* Is the battery even connected? */
495 ok
= (last_inputs
& POWER_INPUT_BATTERY
) != 0;
500 /* No tolerance for any over/under temp - wait for it to
501 * come back into safe range. */
502 static const signed char temp_ranges
[2][2] =
504 /* Temperature range before beginning charging */
505 { BATTERY_CHARGE_MIN
,
506 BATTERY_CHARGE_MAX
},
507 /* Temperature range after out-of-range detected -
508 charging will self-resume */
509 { BATTERY_CHARGE_RESTART_MIN
,
510 BATTERY_CHARGE_RESTART_MAX
},
513 int temp
= battery_adc_temp();
514 const signed char *range
= temp_ranges
[temp_state
];
516 ok
= temp
>= range
[TEMP_LOW_LIMIT
] &&
517 temp
<= range
[TEMP_HIGH_LIMIT
];
521 case TEMP_STATE_NORMAL
:
523 temp_state
= TEMP_STATE_WAIT
;
526 case TEMP_STATE_WAIT
:
528 temp_state
= TEMP_STATE_NORMAL
;
538 /* Any events that should stop the regulator? */
540 /* Overvoltage at CHRGRAW? */
541 ok
= (int_sense0
& MC13783_CHGOVS
) == 0;
545 /* CHGCURR sensed? */
546 ok
= (int_sense0
& MC13783_CHGCURRS
) != 0;
550 /* Debounce transient states */
551 if (chgcurr_timer
> 0)
559 chgcurr_timer
= CHGCURR_TIMEOUT
;
563 /* Charger may need to be reinserted */
565 charge_state
= CHARGE_STATE_ERROR
;
568 if (charger_setting
!= 0)
572 /* Protect against any conceivable overcharge/voltage condition
573 * before hardware protection must intervene. Disable charger
575 ok
= battery_voltage() < BATT_TOO_HIGH
;
577 charge_state
= CHARGE_STATE_DISABLED
;
582 /* Watch to not overheat FET (nothing should go over about 1012.7mW).
583 * Trying a higher voltage AC adapter can work (up to 6.90V) but
584 * we'll just reject that. Reducing current for adapters that bring
585 * CHRGRAW to > 4.900V is another possible action. */
586 ok
= cccv_regulator_dissipation() < 1150;
588 charge_state
= CHARGE_STATE_ERROR
;
593 int state
= charge_state
;
595 if (state
> DISCHARGING
)
598 /* Force off for all states including maintaining the battery level
600 charge_state
= CHARGE_STATE_ERROR
;
602 charge_state
= state
;
609 void powermgmt_init_target(void)
611 #ifdef IMX31_ALLOW_CHARGING
612 const uint32_t regval_w
=
613 MC13783_VCHRG_4_050V
| MC13783_ICHRG_0MA
|
614 MC13783_ICHRGTR_0MA
| MC13783_OVCTRL_6_90V
;
616 /* Use watchdog to shut system down if we lose control of the charging
618 watchdog_init(WATCHDOG_TIMEOUT
);
620 mc13783_write(MC13783_CHARGER
, regval_w
);
622 if (mc13783_read(MC13783_CHARGER
) == regval_w
)
624 /* Divide CHRGRAW input by 10 */
625 mc13783_clear(MC13783_ADC0
, MC13783_CHRGRAWDIV
);
626 /* Turn off BATTDETB. It's worthless on MESx0V since the battery
627 * isn't removable (nor the thermistor). */
628 mc13783_clear(MC13783_POWER_CONTROL0
, MC13783_BATTDETEN
);
632 /* Register has the wrong value - set error condition and disable
633 * since something is wrong. */
634 charge_state
= CHARGE_STATE_DISABLED
;
638 /* Disable charger use */
639 charge_state
= CHARGE_STATE_DISABLED
;
643 /* Returns true if the unit is charging the batteries. */
644 bool charging_state(void)
646 switch (charge_state
)
657 /* Filtered battery charge current */
658 int battery_charge_current(void)
660 return icharger_ave
/ ICHARGER_AVE_SAMPLES
;
663 static void charger_plugged(void)
665 adc_enable_channel(ADC_BATTERY_TEMP
, true);
666 autorecharge_counter
= -1;
669 static void charger_unplugged(void)
671 /* Charger pulled - turn off current sources (though hardware
672 * will have done that anyway). */
673 if (charge_state
> CHARGE_STATE_DISABLED
)
675 /* Reset state and clear any error. If disabled, the charger
676 * will not have been started or will have been stopped already. */
678 charge_state
= DISCHARGING
;
681 /* Might need to reevaluate these bits in charger_none. */
682 last_inputs
&= ~(POWER_INPUT
| POWER_INPUT_CHARGER
);
683 temp_state
= TEMP_STATE_NORMAL
;
684 autorecharge_counter
= 0;
687 adc_enable_channel(ADC_BATTERY_TEMP
, false);
690 static void charger_none(void)
692 unsigned int pwr
= power_thread_inputs
;
694 if (last_inputs
!= pwr
)
698 if (charge_state
== CHARGE_STATE_DISABLED
)
701 if ((pwr
& (POWER_INPUT
| POWER_INPUT_CHARGER
)) == POWER_INPUT_USB
)
703 /* USB connected but not configured. Maintain battery to the
704 * greatest degree possible. It probably won't be enough but the
705 * discharge won't be so severe. */
707 charger_setting
= CHARGER_ADJUST
;
712 last_inputs
= pwr
; /* Restore status */
715 else if (charger_setting
!= 0)
717 /* Maintaining - keep filter going and check charge state */
718 int_sense0
= mc13783_read(MC13783_INTERRUPT_SENSE0
);
720 if (!charger_current_filter_step())
722 /* Failed to read current */
723 charge_state
= CHARGE_STATE_ERROR
;
730 static void charger_control(void)
732 unsigned int pwr
= power_thread_inputs
;
734 if (last_inputs
!= pwr
)
736 unsigned int changed
= last_inputs
^ pwr
;
740 if (charger_setting
!= 0)
741 charger_setting
= CHARGER_ADJUST
;
743 if (charge_state
== DISCHARGING
)
745 if (main_charger_connected())
747 /* If main is connected, ignore USB plugs. */
748 if (changed
& POWER_INPUT_MAIN_CHARGER
)
750 /* Main charger plugged - try charge */
751 autorecharge_counter
= -1;
754 else if (pwr
& POWER_INPUT_USB_CHARGER
755 & POWER_INPUT_CHARGER
)
758 if (changed
& POWER_INPUT_USB_CHARGER
)
760 /* USB charger plugged - try charge */
761 autorecharge_counter
= -1;
763 else if (changed
& POWER_INPUT_MAIN_CHARGER
)
765 /* Main charger pulled - go to battery maintenence. */
766 charger_setting
= CHARGER_ADJUST
;
772 if (charger_setting
!= 0 && !charger_current_filter_step())
774 /* Failed to read current */
775 charge_state
= CHARGE_STATE_ERROR
;
778 int_sense0
= mc13783_read(MC13783_INTERRUPT_SENSE0
);
783 switch (charge_state
)
787 /* Battery voltage may have dropped and a charge cycle should
788 * start again. Debounced. */
789 if (autorecharge_counter
< 0 &&
790 battery_adc_voltage() < BATT_FULL_VOLTAGE
)
792 /* Try starting a cycle now if battery isn't already topped
793 * off to allow user to ensure the battery is full. */
795 else if (battery_voltage() > auto_recharge_voltage())
797 /* Still above threshold - reset counter */
798 autorecharge_counter
= AUTORECHARGE_COUNTDOWN
;
801 else if (autorecharge_counter
> 0)
803 /* Coundown to restart */
804 autorecharge_counter
--;
808 autorecharge_counter
= 0;
810 charging_set_thread_priority(true);
812 if (stat_battery_reading(ADC_BATTERY
) < BATT_VTRICKLE_CHARGE
)
814 /* Battery is deeply discharged - precharge at lower current. */
815 charge_state
= TRICKLE
;
819 /* Ok for fast charge */
820 charge_state
= CHARGING
;
823 charger_setting
= CHARGER_ADJUST
;
824 charger_total_timer
= CHARGER_TOTAL_TIMER
*60*2;
828 case TRICKLE
: /* Very low - precharge */
830 if (battery_voltage() <= BATT_VTRICKLE_CHARGE
)
833 /* Switch to normal charge mode. */
834 charge_state
= CHARGING
;
835 charger_setting
= CHARGER_ADJUST
;
839 case CHARGING
: /* Constant-current stage */
840 case TOPOFF
: /* Constant-voltage stage */
842 /* Reg. mode is more informative than an operational necessity. */
843 charge_state
= (int_sense0
& MC13783_CCCVS
) ? TOPOFF
: CHARGING
;
845 if (main_charger_connected())
847 /* Monitor and stop if current drops below threshold. */
848 if (battery_charge_current() > BATTERY_ICHARGE_COMPLETE
)
853 /* Accurate I-level can't be determined since device also
854 * powers through the I sense. This simply stops the reporting
855 * of charging but the regulator remains on. */
856 if (battery_voltage() <= BATT_USB_VSTOP
)
862 } /* CHARGING: TOPOFF: */
868 /* Check if charger timer expired and stop it if so. */
869 if (charger_total_timer
> 0 && --charger_total_timer
== 0)
871 charge_state
= CHARGE_STATE_ERROR
;
872 stop_charger(); /* Time ran out - error */
876 /* Main charging algorithm - called from powermgmt.c */
877 void charging_algorithm_step(void)
879 #ifdef IMX31_ALLOW_CHARGING
884 /* Switch by input state */
885 switch (charger_input_state
)
891 case CHARGER_PLUGGED
:
899 case CHARGER_UNPLUGGED
:
906 if (charge_state
!= CHARGE_STATE_DISABLED
)
908 /* Disable starts while shutting down */
909 charge_state
= CHARGE_STATE_DISABLED
;
913 charger_close
= false;
917 if (charger_setting
!= 0)
919 if ((mc13783_read(MC13783_CHARGER
) & (MC13783_ICHRG
| MC13783_VCHRG
)) !=
922 /* The hardware setting doesn't match. It could have turned the
923 * charger off in a race of plugging/unplugging or the setting
924 * was changed in one of the calls. */
925 adjust_charger_current();
930 /* Disable the charger and prepare for poweroff - called off-thread so we
931 * signal the charging thread to prepare to quit. */
932 void charging_algorithm_close(void)
934 charger_close
= true;
936 /* Power management thread will set it false again */
937 while (charger_close
)