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/*
* Copyright (C) 2020 The Android Open Source 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.
*/
#define LOG_TAG "dChargerDetect"
#include <android-base/file.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>
#include <cutils/klog.h>
#include <dirent.h>
#include <pixelhealth/ChargerDetect.h>
#include <string>
constexpr char kPowerSupplySysfsPath[]{"/sys/class/power_supply/"};
constexpr char kUsbOnlinePath[]{"/sys/class/power_supply/usb/online"};
constexpr char kUsbPowerSupplySysfsPath[]{"/sys/class/power_supply/usb/usb_type"};
constexpr char kTcpmPsyFilter[]{"tcpm"};
using android::BatteryMonitor;
namespace hardware {
namespace google {
namespace pixel {
namespace health {
int ChargerDetect::readFromFile(const std::string& path, std::string* buf) {
if (android::base::ReadFileToString(path.c_str(), buf)) {
*buf = android::base::Trim(*buf);
}
return buf->length();
}
int ChargerDetect::getIntField(const std::string& path) {
std::string buf;
int value = 0;
if (readFromFile(path, &buf) > 0)
android::base::ParseInt(buf, &value);
return value;
}
/*
* Traverses through /sys/class/power_supply/ to identify TCPM(Type-C/PD) power supply.
* TCPM power supply's name follows the format "tcpm-source-psy-6-0025" with i2c/i3c bus id
* and client id(SID) baked in.
*/
void ChargerDetect::populateTcpmPsyName(std::string* tcpmPsyName) {
std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(kPowerSupplySysfsPath), closedir);
if (dir == NULL) {
KLOG_ERROR(LOG_TAG, "Could not open %s\n", kPowerSupplySysfsPath);
} else {
struct dirent* entry;
while ((entry = readdir(dir.get()))) {
const char* name = entry->d_name;
KLOG_INFO(LOG_TAG, "Psy name:%s", name);
if (strstr(name, kTcpmPsyFilter)) {
*tcpmPsyName = name;
}
}
}
}
/*
* The contents of /sys/class/power_supply/<Power supply name>/usb_type follows the format:
* Unknown [SDP] CDP DCP
* with the current selected value encloses within square braces.
* This functions extracts the current selected value and returns it back to the caller.
*/
int ChargerDetect::getPsyUsbType(const std::string& path, std::string* type) {
size_t start;
std::string usbType;
int ret;
ret = readFromFile(path, &usbType);
if (ret <= 0) {
KLOG_ERROR(LOG_TAG, "Error reading %s: %d\n", path.c_str(), ret);
return -EINVAL;
}
start = usbType.find('[');
if (start == std::string::npos) {
KLOG_ERROR(LOG_TAG, "'[' not found in %s: %s\n", path.c_str(), usbType.c_str());
return -EINVAL;
}
*type = usbType.substr(start + 1, usbType.find(']') - start - 1);
return 0;
}
/*
* Reads the usb power_supply's usb_type and the tcpm power_supply's usb_type to infer
* HealthInfo(hardware/interfaces/health/1.0/types.hal) online property.
*/
void ChargerDetect::onlineUpdate(struct android::BatteryProperties *props) {
std::string tcpmOnlinePath, usbPsyType;
static std::string tcpmPsyName;
int ret;
props->chargerAcOnline = false;
props->chargerUsbOnline = false;
if (tcpmPsyName.empty()) {
populateTcpmPsyName(&tcpmPsyName);
KLOG_INFO(LOG_TAG, "TcpmPsyName:%s\n", tcpmPsyName.c_str());
}
if (!getIntField(kUsbOnlinePath)) {
return;
}
ret = getPsyUsbType(kUsbPowerSupplySysfsPath, &usbPsyType);
if (!ret) {
if (usbPsyType == "CDP" || usbPsyType == "DCP") {
props->chargerAcOnline = true;
return;
} else if (usbPsyType == "SDP") {
props->chargerUsbOnline = true;
return;
}
}
if (tcpmPsyName.empty()) {
return;
}
ret = getPsyUsbType(std::string(kPowerSupplySysfsPath) + tcpmPsyName + "/usb_type" ,
&usbPsyType);
if (ret < 0) {
return;
}
KLOG_INFO(LOG_TAG, "TcpmPsy Usbtype:%s\n", usbPsyType.c_str());
if (usbPsyType == "PD" || usbPsyType == "PD_PPS") {
props->chargerAcOnline = true;
}
return;
}
} // namespace health
} // namespace pixel
} // namespace google
} // namespace hardware
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