We implemented a fancy state machine for link to try and feed
almost-dead batteries smaller amounts of current than the charger
could normally supply, by dithering down the voltage to less than was
requested. It's a lot simpler just to give the battery the smallest
non-zero amount of current we can give it at the voltage it asks for.
Remove the precharge code, since we won't use it on any future
platform and link has already branched.
BUG=chrome-os-partner:20881
BRANCH=none
TEST=find a really dead batery and try to charge it, or do what I did
and just hack the battery module to lie about the requested values,
and see that it always gets the minimum current step at the requested
voltage.
Change-Id: I30bcb62bbe215abafb3a98c52e2afed3b74ead1a
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/61789
This preserves more battery for the real-time clock. It also gets rid
of one battery level/state, since the EC will now shut down at the
same level (2%) as the AP.
Having the EC hibernate at the same level as the AP shuts down also
prevents the following weird scenario:
- EC powers on at 2% battery.
- EC won't power on the AP to do software sync because battery is low.
- But the charge state machine won't actually hibernate the EC until 1%.
- Between 2% and 1%, AC is inserted and system starts charging.
- But EC-RO is what's doing the charging; we should go through software sync
before charging.
BUG=chrome-os-partner:17124
BRANCH=link
TEST=manual
On battery power,
1) With system on, battfake 2 -> system shuts down and EC hibernates
2) With system off, battfake 2 -> EC hibernates
Change-Id: I87d17f70d60673f3e3f1c6eb88f3f00a8c9ed4e7
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/44314
In preparation for cleaning up low-battery logic. Make clear what
comparison operator is used for each constant (<=, <, >=, >).
Also remove hard-coded and unused display of design warning/low
battery levels from ectool. Verified via code search that these are
not used anywhere. Even if we later care about these levels, they
should be battery-specific and not hard-coded as a
platform-independent percentage of full capacity when ectool is
compiled.
BUG=chrome-os-partner:17124
BRANCH=link
TEST=compile link; 'ectool battery' from root shell prints valid info
Change-Id: I3650e27a08f4cc77067beb0685ee1488cc56d02f
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/43119
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
We already shut down the main processor below 3%. Hibernating the EC
below 2% will further cut power draw and minimize the risk of
deep-discharging the battery.
BUG=chrome-os-partner:14839
BRANCH=link
TEST=manual
1) discharge battery below 3%; system should shut down. when powered
on again it should shut back down within ~10 sec.
2) discharge battery below 2%; when system shuts down it should also hibernate.
(I've also tested this with a hacked smart_battery.c which lies about
the battery state of charge, since that's faster than waiting for my
battery to discharge.)
Change-Id: I504ba927012430db5cf10b895a36e6cd6fdf4c8b
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/34793
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Tell the host the battery is no longer charging when it hits 97%, and
set the power adapter LED to green.
This solves several problems:
1) The last 3% of charge takes a looong time. Kernel/ACPI/UI already
have a hack to show the battery as charged when it's about 3% from
full, but the EC still showed a yellow LED.
2) If the system is charged and you briefly unplug the adapter, the
LED turned yellow for a long time as it slowly trickle-charged. Now
it goes right to green.
3) A fully-charged battery will drop below 100% charge as it settles,
but won't accept more current at that time. This caused the LED to
turn yellow and stay there until the battery finally settled down to
~96%, at which point it'd accept more current and top itself off. The
whole time it did this, the kernel/ACPI/UI hack from (1) would keep
reporting "battery full". Now the LED stays green too.
BUG=chrome-os-partner:11248
BRANCH=link
TEST=manual
- Discharge system to <95% full.
- Plug adapter in. LED should come on yellow.
- At around 97% full, the LED should turn green.
- Around that the UI will display "battery full".
(Note that due to rounding, the UI may take a few minutes to display
"battery full" after the LED goes green; that's ok)
- Unplug and replug adapter. LED should come on green. UI still reports
"battery full".
Change-Id: Ie56fbf3a05239e73d2c765bb98d36aa5cfedc2ef
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/34452
Yet another set of tweaks to the lightbar patterns:
At Startup or wake from sleep, Google colors cycle in.
While running, > 25% power level in the battery:
All blue, in a breathing effect (cycle up and down 30%).
While running, <= 25% power level in battery:
Same as above, but with red
Shutting down, or going into sleep:
Cycle out the Google colors (Note: the effect is only visible for S0->S3,
because shutting down kills power to the lightbar before we can react).
While sleeping:
Similar to now, but only using Blue and red for battery indication as above.
The EC doesn't have access to the ALS, so we use the keyboard backlight to
control the lightbar brightness instead:
If keyboard backlight is OFF (which it is when ambient is bright), use max
brightness for lightbar.
If keyboard backlight is ON, use keyboard backlight brightness.
BUG=chrome-os-partner:13870
BRANCH=Link
TEST=none
This is an aesthetic change. Nothing to test, only artisitic criticism.
Change-Id: Ib0b98eef18984945a83e988588c225025c4e8e52
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/33824
Reviewed-by: Randall Spangler <rspangler@chromium.org>
At other times, the battery should follow the normal charging rules.
Using the trickle charging logic has 2 problems here:
1) Battery voltage is near maximum, so trickle charging logic starts
out with voltage less than the actual battery voltage, and less than
the charging spec.
2) Trickle charging only exits when battery requests more current
(which it won't if it's near full) or on 4-hour timeout, not when
battery reads 100%. So this can cause overcharging.
Note that we still limit the charging current to what the battery asks
for, but if that's less than the minimum current from the charger we
simply provide the minimum and don't fiddle with the voltage since
that may interfere with the battery's ability to determine it's fully
charged.
BUG=chrome-os-partner:14402
BRANCH=link
TEST=manual
1. charge laptop to full
2. quickly unplug and plug charger
3. look at debug log; should either not charge at all (if charge is currently
100%) or charge at 8400mV (if charge is less than 100%).
Change-Id: Ifd5a9eb2e9bb791f74196713b645d1c9211eb736
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/33729
Reviewed-by: Rong Chang <rongchang@chromium.org>
I keep getting asked to build an EC image to manually control the lightbar
patterns so that the Powers That Be can look at it. This change just makes
it possible to turn that mode on and off for yourself. You'll need a root
shell or the EC console to do it, though.
BUG=chrome-os-partner:8039
BRANCH=link
TEST=manual
From the EC console, type
lightbar demo 1
OR from the root shell run
ectool lightbar demo 1
After that, these keys should change the lightbar appearance (transitions
may be slow and subtle - that's intended):
UP = battery is more fully charged
DOWN = battery is less fully charged
RIGHT = battery is charging
LEFT = battery is discharging
BRIGHT = increase lightbar brightness
DIM = decrase lightbar brightness
Note that this does not interfere with the normal function of any keys. It
only adds some additional EC behavior.
Change-Id: Ia1a9855188244d74b670f9dbfdf60e3ac0343460
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/30899
BUG=chrome-os-partner:8039
TEST=manual
Boot the system, look at the lightbar. It should pulse colors slowly on
battery, faster on AC.
Change-Id: I0184973d11eda51db87d652aa2c92995f5a25588
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/27810
Adding trickle charging mode to precharge batteries with
voltage lower than minimal design value. This CL adds
control to charger voltage to track battery input current
change.
To prevent battery from deeply discharging, this CL preserves
3% of the design capacity.
Minor bug fixes include error state check and charger control
logic.
Signed-off-by: Rong Chang <rongchang@chromium.org>
BUG=chrome-os-partner:8660,8661
TEST=manual
Plug AC power, the power adapter led should be
'yellow'. On the EC serial console, type 'battery'
and 'charger' commands.
Battery input current should staid close to its
desired current.
A deeply discharged battery (5.5V) should be revived to
a healthy state after 30 minutes ~ 4 hours.
Change-Id: Ibaa2396c6b751639d98db32f5919b1e8ec700e40
This CL adds battery SMI events. And refactors the charging state
machine by adding share state context for all handlers.
Power events are moved to common handler. Minor clean up on console
output messages.
Signed-off-by: Rong Chang <rongchang@chromium.org>
BUG=chrome-os-partner:7526,7937,8450
TEST=manual:
Watch console message when connecting/disconnecting AC adapter and
battery. Check the state transition.
Change-Id: I42eec4f87a9d49bd193cb9dde9080e3dfccbb77c
This CL adds LPC commands to provide the following information:
- Design Capacity (dword)
- Last Full Charge Capacity (dword)
- Design Voltage (dword)
- Design Capacity of Warning (dword)
- Design Capacity of Low (dword)
- Battery Type (ascii)
- Model Number (ascii)
- Serial Number (ascii)
- OEM (usually Vendor) (ascii)
- Battery charge cycle count (dword)
Signed-off-by: Rong Chang <rongchang@chromium.org>
BUG=chrome-os-partner:8181
TEST=none
CQ-DEPEND:Iad4d63c996272568b5a661a6716790ef151b29c5
Change-Id: Iabaf7d9862e15c5b21cf5170cf43450e472b7836
