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healthd: Read the max power supply voltage 

With Type-C PD, VBUS can no longer be assumed to
to be at 5V. Read the "voltage_max" field from the
power_supply class node and export it through
BatteryProperties service.

Bug: 25229483
Change-Id: I04e32d9783a21bab375f1724758a9eeace2a047c
This commit is contained in:
Badhri Jagan Sridharan 2015-10-27 10:43:53 -07:00 committed by Ruchi Kandoi
parent 2eaa41a6df
commit 40e1df4488
1 changed files with 24 additions and 7 deletions
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31
healthd/BatteryMonitor.cpp
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@ -39,6 +39,8 @@
#define FAKE_BATTERY_CAPACITY 42
#define FAKE_BATTERY_TEMPERATURE 424
#define ALWAYS_PLUGGED_CAPACITY 100
#define MILLION 10000000.0
#define DEFAULT_VBUS_VOLTAGE 5000000
namespace android {
@ -61,6 +63,7 @@ static void initBatteryProperties(BatteryProperties* props) {
props->chargerUsbOnline = false;
props->chargerWirelessOnline = false;
props->maxChargingCurrent = 0;
props->maxChargingVoltage = 0;
props->batteryStatus = BATTERY_STATUS_UNKNOWN;
props->batteryHealth = BATTERY_HEALTH_UNKNOWN;
props->batteryPresent = false;
@ -254,6 +257,7 @@ bool BatteryMonitor::update(void) {
props.batteryTechnology = String8(buf);
unsigned int i;
double MaxPower = 0;
for (i = 0; i < mChargerNames.size(); i++) {
String8 path;
@ -282,11 +286,23 @@ bool BatteryMonitor::update(void) {
path.clear();
path.appendFormat("%s/%s/current_max", POWER_SUPPLY_SYSFS_PATH,
mChargerNames[i].string());
if (access(path.string(), R_OK) == 0) {
int maxChargingCurrent = getIntField(path);
if (props.maxChargingCurrent < maxChargingCurrent) {
props.maxChargingCurrent = maxChargingCurrent;
}
int ChargingCurrent =
(access(path.string(), R_OK) == 0) ? getIntField(path) : 0;
path.clear();
path.appendFormat("%s/%s/voltage_max", POWER_SUPPLY_SYSFS_PATH,
mChargerNames[i].string());
int ChargingVoltage =
(access(path.string(), R_OK) == 0) ? getIntField(path) :
DEFAULT_VBUS_VOLTAGE;
double power = ((double)ChargingCurrent / MILLION) *
((double)ChargingVoltage / MILLION);
if (MaxPower < power) {
props.maxChargingCurrent = ChargingCurrent;
props.maxChargingVoltage = ChargingVoltage;
MaxPower = power;
}
}
}
@ -416,9 +432,10 @@ void BatteryMonitor::dumpState(int fd) {
int v;
char vs[128];
snprintf(vs, sizeof(vs), "ac: %d usb: %d wireless: %d current_max: %d\n",
snprintf(vs, sizeof(vs), "ac: %d usb: %d wireless: %d current_max: %d voltage_max: %d\n",
props.chargerAcOnline, props.chargerUsbOnline,
props.chargerWirelessOnline, props.maxChargingCurrent);
props.chargerWirelessOnline, props.maxChargingCurrent,
props.maxChargingVoltage);
write(fd, vs, strlen(vs));
snprintf(vs, sizeof(vs), "status: %d health: %d present: %d\n",
props.batteryStatus, props.batteryHealth, props.batteryPresent);