[Telemetry] Support dumpsys power monitoring on the Nexus 5.

build/android/pylib/android_commands.py

Index: build/android/pylib/android_commands.py
diff --git a/build/android/pylib/android_commands.py b/build/android/pylib/android_commands.py
index 0a4b2f0e47348b60bffdc9a74536c980113aa9a5..ea86e6d90176beddca6f2f5c7217635793a09f72 100644
--- a/build/android/pylib/android_commands.py
+++ b/build/android/pylib/android_commands.py
@@ -78,6 +78,20 @@ CONTROL_USB_CHARGING_COMMANDS = [
     'disable_command':
         'echo 1 > /sys/module/pm8921_charger/parameters/disabled',
   },
+  {
+    # Nexus 5
+    # Setting the HIZ bit of the bq24192 causes the charger to actually ignore

[pasko, 2014/10/14 09:16:22]

Wow! Cool! How do I discover similar things for newer devices? TI datasheets are
complex :(

+    # energy coming from USB. Setting the power_supply offline just updates the
+    # Android system to reflect that.
+    'witness_file': '/sys/kernel/debug/bq24192/INPUT_SRC_CONT',
+    'enable_command': (
+        'echo 0x4A > /sys/kernel/debug/bq24192/INPUT_SRC_CONT && '
+        'echo 1 > /sys/class/power_supply/usb/online'),
+    'disable_command': (
+        'echo 0xCA > /sys/kernel/debug/bq24192/INPUT_SRC_CONT && '
+        'chmod 644 /sys/class/power_supply/usb/online && '
+        'echo 0 > /sys/class/power_supply/usb/online'),
+  },
 ]
 
 class DeviceTempFile(object):