Messages in this thread | | | Date | Tue, 8 Sep 2009 23:19:33 +0200 | From | Pavel Machek <> | Subject | Re: Zaurus suspend saga |
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Hi!
> > > c) We rip the whole thing out and stop supporting "offline" charging. > > > > How much faster is offline charge, compared to online charging? I have > > impression that online charging basically does not charge anything... > > I think that online charging works, but it seems to be slower. I am not > sure, whether it is a hardware or software issue. You can control > charging speed by software, but the final word has the charging > chip.
Well, overnight charge (online) seems to result in pretty much empty battery...
> Here are control wires: > SPITZ_SCP_JK_A: output = turns dummy load to 1 kOhm resistor > SPITZ_SCP_JK_B: output = high charging current > SPITZ_SCP_CHRG_ON: output = charging on > SPITZ_SCP_ADC_TEMP_ON: output = turns battery sensor on/off > SPITZ_GPIO_CHRG_FULL input = charging complete > SPITZ_GPIO_AC_IN input = AC adapter is present
Is CHRG_ON pin reversed?
static void spitz_charge(int on) { if (on) { if (sharpsl_pm.flags & SHARPSL_SUSPENDED) { gpio_set_value(SPITZ_GPIO_JK_B, 1); gpio_set_value(SPITZ_GPIO_CHRG_ON, 0); } else { gpio_set_value(SPITZ_GPIO_JK_B, 0); gpio_set_value(SPITZ_GPIO_CHRG_ON, 0); } } else { gpio_set_value(SPITZ_GPIO_JK_B, 0); gpio_set_value(SPITZ_GPIO_CHRG_ON, 1); } }
> MAX1111 inputs: > MAX1111_ACIN_VOLT: Voltage in AC input (after pass of input circuit, > before tha final diode) > MAX1111_BATT_TEMP: Battery temperature sensor > MAX1111_BATT_VOLT: Battery voltage > > Here are notes from the design: > Pre-charge = 102mA
> Fast charge = 680mA > Fast charge set ON = 105mA
I'm quite confused:
> SPITZ_SCP_JK_B: output = high charging current
Is JK_B active low?
> Iterm = 55mA > > Thresholds: > SPITZ_GPIO_AC_IN: 4.2V (IC charging circuit) > SPITZ_GPIO_FATAL_BAT: 3.0V (voltage detector IC on battery) > PXA270 batt fault: 2.8V (voltage on the main non-regulated power) > CF/SD: 2.8V (voltage required for CF/SD activation, I am > not sure, why it is done, because 2.8V is > outside of spec anyway)
> - It would be nice to have "small travel charger heuristic": Turn fast > charging on, charger "disappears", switch to slow charging, charger > "appears" => stay in slow charging mode, and retry after some time, or > after going to suspend, reset the flag when charger is removed.
Yes, I have similar "travel charger" (from single AA in fact), too, and yes getting that heuristic would be cool. But for now, I'd settle with /sys control enabling that.
> - sysfs interface for charging would be nice. For example: Cyril has an > external battery pack and he wants to disable charging of internal > battery from the external battery.
Yes, more debug info in sysfs and some controls would be nice.
BTW... /sys/class/leds/spitz:amber:charge seems to have life of its own. I can't manually change the brightness; also changing trigger does not work -- it still displays charging status. What is going on?
Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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