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Battery stats in Ubuntu
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06-16-2016, 12:26 PM
I have the battery pack for the Pine, and my goal was to use it sort of like a battery backup for a server. What I'm wondering is if there is a way in Ubuntu to pull any stats on the battery. Mostly I'd like to track the charge percentage if possible just for monitoring purposes. I know it's not connected like an actual UPS, so I assume it can't be managed the same way. Does anybody know if this is possible?
The PMIC for the A64 supports reading out the battery stats, I just dont know if the Linux kernel driver exposes that information to userspace already... /sys/class/power_supply/battery on my Ubuntu running on the pine has all the necessary entries:
Code: ubuntu@pine64:/sys/class/power_supply/battery$ ls -l
total 0
-r--r--r-- 1 root root 4096 Jun 16 18:51 capacity
-r--r--r-- 1 root root 4096 Jun 16 18:51 current_now
lrwxrwxrwx 1 root root 0 Jun 16 18:51 device -> ../../../axp81x-supplyer.47
-r--r--r-- 1 root root 4096 Jun 16 18:51 energy_full_design
-r--r--r-- 1 root root 4096 Jun 16 18:51 health
-r--r--r-- 1 root root 4096 Jun 16 18:51 model_name
-r--r--r-- 1 root root 4096 Jun 16 18:51 online
drwxr-xr-x 2 root root 0 Jun 16 18:51 power
-r--r--r-- 1 root root 4096 Jun 16 17:30 present
-r--r--r-- 1 root root 4096 Jun 16 18:51 status
lrwxrwxrwx 1 root root 0 Jun 16 18:51 subsystem -> ../../../../../../class/power_supply
-r--r--r-- 1 root root 4096 Jun 16 18:51 technology
-r--r--r-- 1 root root 4096 Jun 16 18:51 temp
-r--r--r-- 1 root root 4096 Jun 16 18:51 type
-rw-r--r-- 1 root root 4096 Jun 16 18:51 uevent
-r--r--r-- 1 root root 4096 Jun 16 18:51 voltage_max_design
-r--r--r-- 1 root root 4096 Jun 16 18:51 voltage_min_design
-r--r--r-- 1 root root 4096 Jun 16 18:51 voltage_now
ubuntu@pine64:/sys/class/power_supply/battery$I dont have a battery attached to test if the files contain actual values....
Come have a chat in the Pine IRC channel >>
06-16-2016, 01:12 PM
Thanks for the pointer. It looks like there are actual values there:
Code: /sys/class/power_supply/battery/capacity: 98
/sys/class/power_supply/battery/current_now: 416000
/sys/class/power_supply/battery/energy_full_design: 4800
/sys/class/power_supply/battery/health: Good
/sys/class/power_supply/battery/model_name: battery
/sys/class/power_supply/battery/online: 0
/sys/class/power_supply/battery/present: 1
/sys/class/power_supply/battery/status: Charging
/sys/class/power_supply/battery/technology: LiFe
/sys/class/power_supply/battery/temp: 290
/sys/class/power_supply/battery/type: Battery
/sys/class/power_supply/battery/uevent: POWER_SUPPLY_NAME=battery
POWER_SUPPLY_MODEL_NAME=battery
POWER_SUPPLY_STATUS=Charging
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_ONLINE=0
POWER_SUPPLY_HEALTH=Good
POWER_SUPPLY_TECHNOLOGY=LiFe
POWER_SUPPLY_VOLTAGE_MAX_DESIGN=4200000
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=3300
POWER_SUPPLY_VOLTAGE_NOW=4181000
POWER_SUPPLY_CURRENT_NOW=416000
POWER_SUPPLY_ENERGY_FULL_DESIGN=4800
POWER_SUPPLY_CAPACITY=98
POWER_SUPPLY_TEMP=290
/sys/class/power_supply/battery/voltage_max_design: 4200000
/sys/class/power_supply/battery/voltage_min_design: 3300
/sys/class/power_supply/battery/voltage_now: 4181000
Thats nice to see since I am about to order a battery for my Pine. The PMIC has some more features for battery charging and monitoring that can be / need to be configured... that's something that needs to be worked out I guess... it has a "Fuel Gauge" feature for example that needs to be calibrated (like the battery gauges in the smart batteries for laptops ...) and programmable charge current / cut off voltage....
Just FYI, you can also read out the system voltages (set values) from the PMIC from the sysfs: Code: ubuntu@pine64:~$ ./pmic_state
Regulator 1 ( axp81x_dcdc1) : vcc-nand vcc-emmc vcc-sdc vcc-usb-30 vcc-io vcc-pd : enabled ( 2 users) = 3300 mV (min= 1600 mV, max= 3400 mV
Regulator 2 ( axp81x_dcdc2) : vdd-cpua : enabled ( 0 users) = 1040 mV (min= 500 mV, max= 1300 mV
Regulator 3 ( axp81x_dcdc3) : none : enabled ( 0 users) = 1100 mV (min= 500 mV, max= 1300 mV
Regulator 4 ( axp81x_dcdc4) : none : disabled ( 0 users) = 1100 mV (min= 500 mV, max= 1300 mV
Regulator 5 ( axp81x_dcdc5) : vcc-dram : enabled ( 0 users) = 1500 mV (min= 800 mV, max= 1840 mV
Regulator 6 ( axp81x_dcdc6) : vdd-sys : enabled ( 0 users) = 1100 mV (min= 600 mV, max= 1520 mV
Regulator 7 ( axp81x_dcdc7) : none : disabled ( 0 users) = 1000 mV (min= 600 mV, max= 1520 mV
Regulator 8 ( axp81x_rtc) : none : disabled ( 0 users) = 3000 mV (min= 3000 mV, max= 3000 mV
Regulator 9 ( axp81x_aldo1) : vdd-csi-led iovdd-csi vcc-pe : disabled ( 0 users) = 2800 mV (min= 700 mV, max= 3300 mV
Regulator 10 ( axp81x_aldo2) : vcc-pl : enabled ( 0 users) = 1800 mV (min= 700 mV, max= 3300 mV
Regulator 11 ( axp81x_aldo3) : vcc-avcc vcc-pll : enabled ( 0 users) = 3000 mV (min= 700 mV, max= 3300 mV
Regulator 12 ( axp81x_dldo1) : vcc-hdmi-33 : enabled ( 1 users) = 3300 mV (min= 700 mV, max= 3300 mV
Regulator 13 ( axp81x_dldo2) : vcc-mipi : disabled ( 0 users) = 3300 mV (min= 700 mV, max= 4200 mV
Regulator 14 ( axp81x_dldo3) : avdd-csi : disabled ( 0 users) = 2800 mV (min= 700 mV, max= 3300 mV
Regulator 15 ( axp81x_dldo4) : vcc-deviceio : enabled ( 0 users) = 3300 mV (min= 700 mV, max= 3300 mV
Regulator 16 ( axp81x_eldo1) : vcc-cpvdd vcc-wifi-io vcc-pc vcc-pg : enabled ( 2 users) = 1800 mV (min= 700 mV, max= 1900 mV
Regulator 17 ( axp81x_eldo2) : vcc-lcd-0 : disabled ( 0 users) = 1800 mV (min= 700 mV, max= 1900 mV
Regulator 18 ( axp81x_eldo3) : dvdd-csi-18 : disabled ( 0 users) = 1800 mV (min= 700 mV, max= 1900 mV
Regulator 19 ( axp81x_fldo1) : vcc-hsic-12 : disabled ( 0 users) = 1200 mV (min= 700 mV, max= 1450 mV
Regulator 20 ( axp81x_fldo2) : vdd-cpus : enabled ( 0 users) = 1100 mV (min= 700 mV, max= 1450 mV
Regulator 21 (axp81x_gpio0ldo) : vcc-ctp : disabled ( 0 users) = 3100 mV (min= 700 mV, max= 3300 mV
Regulator 22 (axp81x_gpio1ldo) : none : disabled ( 0 users) = 3300 mV (min= 700 mV, max= 3300 mV
Regulator 23 ( axp81x_dc1sw) : vcc-lvds vcc-dsi-33 : enabled ( 1 users) = 1600 mV (min= 0 mV, max= 0 mV
ubuntu@pine64:~$
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