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author | David Ferguson <ferguson.david@gmail.com> | 2013-11-17 18:55:37 +0400 |
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committer | Ricardo Cerqueira <cyanogenmod@cerqueira.org> | 2014-02-11 17:18:26 +0000 |
commit | ad3d2a2ae7409faa1a885363b6d97bc9cd705e77 (patch) | |
tree | 44bd5dcec973c656a260ff000e7f82618763cad3 /libhealthd/Android.mk | |
parent | c2bbe95d98f2eaf8d4bec28c1423ca53675c70f6 (diff) | |
download | device_samsung_smdk4412-common-ad3d2a2ae7409faa1a885363b6d97bc9cd705e77.zip device_samsung_smdk4412-common-ad3d2a2ae7409faa1a885363b6d97bc9cd705e77.tar.gz device_samsung_smdk4412-common-ad3d2a2ae7409faa1a885363b6d97bc9cd705e77.tar.bz2 |
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
Diffstat (limited to 'libhealthd/Android.mk')
-rw-r--r-- | libhealthd/Android.mk | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/libhealthd/Android.mk b/libhealthd/Android.mk new file mode 100644 index 0000000..f1b83d6 --- /dev/null +++ b/libhealthd/Android.mk @@ -0,0 +1,22 @@ +# Copyright (C) 2013 The Android Open Source Project +# Copyright (C) 2013 The CyanogenMod Project +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +LOCAL_PATH := $(call my-dir) + +include $(CLEAR_VARS) +LOCAL_SRC_FILES := healthd_board_exynos4.cpp +LOCAL_MODULE := libhealthd.exynos4 +LOCAL_C_INCLUDES := system/core/healthd +include $(BUILD_STATIC_LIBRARY) |