fix: battery runtime estimation with negative sysfs values
Some drivers (example: qualcomm-battmgr, present on Snapdragon X1 laptops) expose the current_now and power_now values in sysfs as negative int when the device is discharging, positive when charging. This breaks the battery runtime estimation in Waybar, as it expects a uint32 for power_now. Change the battery module to use the absolute values of current_now and power_now.
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@ -273,14 +273,18 @@ waybar::modules::Battery::getInfos() {
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// Scale these by the voltage to get μW/μWh.
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uint32_t current_now = 0;
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int32_t _current_now_int = 0;
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bool current_now_exists = false;
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if (fs::exists(bat / "current_now")) {
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current_now_exists = true;
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std::ifstream(bat / "current_now") >> current_now;
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std::ifstream(bat / "current_now") >> _current_now_int;
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} else if (fs::exists(bat / "current_avg")) {
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current_now_exists = true;
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std::ifstream(bat / "current_avg") >> current_now;
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std::ifstream(bat / "current_avg") >> _current_now_int;
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}
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// Documentation ABI allows a negative value when discharging, positive
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// value when charging.
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current_now = std::abs(_current_now_int);
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if (fs::exists(bat / "time_to_empty_now")) {
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time_to_empty_now_exists = true;
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@ -324,11 +328,15 @@ waybar::modules::Battery::getInfos() {
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}
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uint32_t power_now = 0;
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int32_t _power_now_int = 0;
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bool power_now_exists = false;
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if (fs::exists(bat / "power_now")) {
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power_now_exists = true;
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std::ifstream(bat / "power_now") >> power_now;
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std::ifstream(bat / "power_now") >> _power_now_int;
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}
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// Some drivers (example: Qualcomm) exposes use a negative value when
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// discharging, positive value when charging.
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power_now = std::abs(_power_now_int);
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uint32_t energy_now = 0;
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bool energy_now_exists = false;
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