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Merge pull request #923 from pedrocr/fix-battery-calculations

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Simplify and improve battery state calculations
This commit is contained in:
Alex 2020-12-02 14:35:56 +01:00 committed by GitHub
commit cc365a8175
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 83 additions and 28 deletions
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6
include/modules/battery.hpp
View File

@ -31,16 +31,16 @@ class Battery : public ALabel {
private:
static inline const fs::path data_dir_ = "/sys/class/power_supply/";
void getBatteries();
void refreshBatteries();
void worker();
const std::string getAdapterStatus(uint8_t capacity) const;
const std::tuple<uint8_t, float, std::string> getInfos() const;
const std::string formatTimeRemaining(float hoursRemaining);
std::vector<fs::path> batteries_;
int global_watch;
std::map<fs::path,int> batteries_;
fs::path adapter_;
int fd_;
std::vector<int> wds_;
std::string old_status_;
util::SleeperThread thread_;

2
man/waybar-battery.5.scd
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@ -20,7 +20,7 @@ The *battery* module displays the current capacity and state (eg. charging) of y
*full-at*: ++
typeof: integer ++
Define the max percentage of the battery, useful for an old battery, e.g. 96
Define the max percentage of the battery, for when you've set the battery to stop charging at a lower level to save it. For example, if you've set the battery to stop at 80% that will become the new 100%.
*interval*: ++
typeof: integer ++

103
src/modules/battery.cpp
View File

@ -4,23 +4,31 @@
waybar::modules::Battery::Battery(const std::string& id, const Json::Value& config)
: ALabel(config, "battery", id, "{capacity}%", 60) {
getBatteries();
fd_ = inotify_init1(IN_CLOEXEC);
if (fd_ == -1) {
throw std::runtime_error("Unable to listen batteries.");
}
for (auto const& bat : batteries_) {
auto wd = inotify_add_watch(fd_, (bat / "uevent").c_str(), IN_ACCESS);
if (wd != -1) {
wds_.push_back(wd);
}
// Watch the directory for any added or removed batteries
global_watch = inotify_add_watch(fd_, data_dir_.c_str(), IN_CREATE | IN_DELETE);
if (global_watch < 0) {
throw std::runtime_error("Could not watch for battery plug/unplug");
}
refreshBatteries();
worker();
}
waybar::modules::Battery::~Battery() {
for (auto wd : wds_) {
inotify_rm_watch(fd_, wd);
if (global_watch >= 0) {
inotify_rm_watch(fd_, global_watch);
}
for (auto it = batteries_.cbegin(); it != batteries_.cend(); it++) {
auto watch_id = (*it).second;
if (watch_id >= 0) {
inotify_rm_watch(fd_, watch_id);
}
batteries_.erase(it);
}
close(fd_);
}
@ -43,7 +51,13 @@ void waybar::modules::Battery::worker() {
};
}
void waybar::modules::Battery::getBatteries() {
void waybar::modules::Battery::refreshBatteries() {
// Mark existing list of batteries as not necessarily found
std::map<fs::path, bool> check_map;
for (auto const& bat : batteries_) {
check_map[bat.first] = false;
}
try {
for (auto& node : fs::directory_iterator(data_dir_)) {
if (!fs::is_directory(node)) {
@ -54,12 +68,22 @@ void waybar::modules::Battery::getBatteries() {
if (((bat_defined && dir_name == config_["bat"].asString()) || !bat_defined) &&
fs::exists(node.path() / "capacity") && fs::exists(node.path() / "uevent") &&
fs::exists(node.path() / "status") && fs::exists(node.path() / "type")) {
std::string type;
std::ifstream(node.path() / "type") >> type;
std::string type;
std::ifstream(node.path() / "type") >> type;
if (!type.compare("Battery")){
batteries_.push_back(node.path());
if (!type.compare("Battery")){
check_map[node.path()] = true;
auto search = batteries_.find(node.path());
if (search == batteries_.end()) {
// We've found a new battery save it and start listening for events
auto event_path = (node.path() / "uevent");
auto wd = inotify_add_watch(fd_, event_path.c_str(), IN_ACCESS);
if (wd < 0) {
throw std::runtime_error("Could not watch events for " + node.path().string());
}
batteries_[node.path()] = wd;
}
}
}
auto adap_defined = config_["adapter"].isString();
if (((adap_defined && dir_name == config_["adapter"].asString()) || !adap_defined) &&
@ -76,22 +100,31 @@ void waybar::modules::Battery::getBatteries() {
}
throw std::runtime_error("No batteries.");
}
// Remove any batteries that are no longer present and unwatch them
for (auto const& check : check_map) {
if (!check.second) {
auto watch_id = batteries_[check.first];
if (watch_id >= 0) {
inotify_rm_watch(fd_, watch_id);
}
batteries_.erase(check.first);
}
}
}
const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos() const {
try {
uint16_t total = 0;
uint32_t total_power = 0; // μW
uint32_t total_energy = 0; // μWh
uint32_t total_energy_full = 0;
std::string status = "Unknown";
for (auto const& bat : batteries_) {
uint16_t capacity;
for (auto const& item : batteries_) {
auto bat = item.first;
uint32_t power_now;
uint32_t energy_full;
uint32_t energy_now;
std::string _status;
std::ifstream(bat / "capacity") >> capacity;
std::ifstream(bat / "status") >> _status;
auto rate_path = fs::exists(bat / "current_now") ? "current_now" : "power_now";
std::ifstream(bat / rate_path) >> power_now;
@ -102,7 +135,6 @@ const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos
if (_status != "Unknown") {
status = _status;
}
total += capacity;
total_power += power_now;
total_energy += energy_now;
total_energy_full += energy_full;
@ -119,19 +151,33 @@ const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos
time_remaining = (float)total_energy / total_power;
} else if (status == "Charging" && total_power != 0) {
time_remaining = -(float)(total_energy_full - total_energy) / total_power;
if (time_remaining > 0.0f) {
// If we've turned positive it means the battery is past 100% and so
// just report that as no time remaining
time_remaining = 0.0f;
}
}
uint16_t capacity = total / batteries_.size();
float capacity = ((float)total_energy * 100.0f / (float) total_energy_full);
// Handle full-at
if (config_["full-at"].isUInt()) {
auto full_at = config_["full-at"].asUInt();
if (full_at < 100) {
capacity = 100.f * capacity / full_at;
if (capacity > full_at) {
capacity = full_at;
}
}
}
return {capacity, time_remaining, status};
if (capacity > 100.f) {
// This can happen when the battery is calibrating and goes above 100%
// Handle it gracefully by clamping at 100%
capacity = 100.f;
}
uint8_t cap = round(capacity);
if (cap == 100) {
// If we've reached 100% just mark as full as some batteries can stay
// stuck reporting they're still charging but not yet done
status = "Full";
}
return {cap, time_remaining, status};
} catch (const std::exception& e) {
spdlog::error("Battery: {}", e.what());
return {0, 0, "Unknown"};
@ -154,10 +200,14 @@ const std::string waybar::modules::Battery::getAdapterStatus(uint8_t capacity) c
}
const std::string waybar::modules::Battery::formatTimeRemaining(float hoursRemaining) {
hoursRemaining = std::fabs(hoursRemaining);
hoursRemaining = std::fabs(hoursRemaining);
uint16_t full_hours = static_cast<uint16_t>(hoursRemaining);
uint16_t minutes = static_cast<uint16_t>(60 * (hoursRemaining - full_hours));
auto format = std::string("{H} h {M} min");
if (full_hours == 0 && minutes == 0) {
// Migh as well not show "0h 0min"
return "";
}
if (config_["format-time"].isString()) {
format = config_["format-time"].asString();
}
@ -165,6 +215,11 @@ const std::string waybar::modules::Battery::formatTimeRemaining(float hoursRemai
}
auto waybar::modules::Battery::update() -> void {
// Make sure we have the correct set of batteries, in case of hotplug
// TODO: split the global watch into it's own event and only run the refresh
// when there's been a CREATE/DELETE event
refreshBatteries();
auto [capacity, time_remaining, status] = getInfos();
if (status == "Unknown") {
status = getAdapterStatus(capacity);