From ad3d2a2ae7409faa1a885363b6d97bc9cd705e77 Mon Sep 17 00:00:00 2001 From: David Ferguson Date: Sun, 17 Nov 2013 18:55:37 +0400 Subject: Proper battery paths * 4.4 introduces a new daemon, healthd, that handles battery status - resides in: /system/core/healthd - BatteryMonitor.cpp iterates through all the *directories* under /sys/class/power_supply looking for a file called 'type' - if the type == Battery, it assumes this is the location for the battery stats for the device. Only the first directory that matches this criteria is used. - on msm8660/d2/jf/s2 kernels, this search results in: /sys/class/power_supply/fuelgauge. - To determine capacity, healthd looks at the contents of the 'capacity' file under this discovered base path. This results in /sys/class/power_supply/fuelgauge/capacity on msm8660/d2/jf/s2 kernels. - Unfortunately, this is the wrong path. The capacity file at this location returns a large negative number. - Other paths like status, voltage_now, and present are also incorrectly determined. * For comparison, in 4.3 battery statistics gathering was handled by frameworks/base/services/jni/com_android_server_BatteryService.cpp - BatteryService does a similar search for a file called 'type' with the contents of 'Battery' - But the search logic is different here: it takes the *last* path that matches the criteria. - This results in the correct /sys/class/power_supply/battery * This patch overrides the discovery mechanism for battery status completely. Change-Id: I4579c92bba5596eef4dac67b8c0687be50a1d2f5 --- BoardCommonConfig.mk | 3 +++ 1 file changed, 3 insertions(+) (limited to 'BoardCommonConfig.mk') diff --git a/BoardCommonConfig.mk b/BoardCommonConfig.mk index d45fe93..1b7ca17 100644 --- a/BoardCommonConfig.mk +++ b/BoardCommonConfig.mk @@ -155,5 +155,8 @@ BOARD_HAS_NO_SELECT_BUTTON := true BOARD_CHARGING_MODE_BOOTING_LPM := /sys/class/power_supply/battery/batt_lp_charging BOARD_BATTERY_DEVICE_NAME := "battery" +# Override healthd HAL +BOARD_HAL_STATIC_LIBRARIES := libhealthd.exynos4 + # inherit from the proprietary version -include vendor/samsung/smdk4412-common/BoardConfigVendor.mk -- cgit v1.1