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#include "battery.h"
#include "common/io.h"
#include "common/strutil.h"
#include "common/debug.h"
#include <dirent.h>
#include <unistd.h>
#include <fcntl.h>
// https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-power
static bool parseBattery(int dfd, const char* id, FFBatteryOptions* options, FFlist* results, bool* acConnected) {
FF_STRBUF_AUTO_DESTROY tmpBuffer = ffStrbufCreate();
{
char present = '\0';
if (ffReadFileDataRelative(dfd, "present", 1, &present) && present == '0') {
FF_DEBUG("Battery \"%s\": Not present", id);
return false;
}
}
// type must exist
if (!ffReadFileBufferRelative(dfd, "type", &tmpBuffer)) {
FF_DEBUG("Battery \"%s\": No type file", id);
return false;
}
ffStrbufTrimRightSpace(&tmpBuffer);
if (ffStrbufEqualS(&tmpBuffer, "Mains")) {
if (*acConnected) {
FF_DEBUG("Battery \"%s\": Type is Mains, but AC is already connected", id);
return false;
}
char online = '\0';
if (ffReadFileDataRelative(dfd, "online", 1, &online) == 1 && online == '1') {
*acConnected = true;
}
FF_DEBUG("Battery \"%s\": Type is Mains, AC Connected: %s", id, *acConnected ? "Yes" : "No");
return false;
} else if (!ffStrbufEqualS(&tmpBuffer, "Battery")) {
FF_DEBUG("Battery \"%s\": Type is not Battery or Mains, but \"%s\"", id, tmpBuffer.chars);
return false;
}
// scope may not exist or must not be "Device"
if (ffReadFileBufferRelative(dfd, "scope", &tmpBuffer)) {
ffStrbufTrimRightSpace(&tmpBuffer);
FF_DEBUG("Battery \"%s\": Scope is \"%s\"", id, tmpBuffer.chars);
if (ffStrbufEqualS(&tmpBuffer, "Device")) {
return false;
}
}
// `capacity` must exist
// This is expensive in my laptop
if (!ffReadFileBufferRelative(dfd, "capacity", &tmpBuffer)) {
FF_DEBUG("Battery \"%s\": No capacity file", id);
return false;
}
FFBatteryResult* result = FF_LIST_ADD(FFBatteryResult, *results);
ffStrbufInit(&result->manufacturer);
ffStrbufInit(&result->modelName);
ffStrbufInit(&result->technology);
ffStrbufInit(&result->serial);
ffStrbufInit(&result->manufactureDate);
result->status = FF_BATTERY_STATUS_NONE;
result->capacity = ffStrbufToDouble(&tmpBuffer, 0);
result->cycleCount = 0;
result->temperature = FF_BATTERY_TEMP_UNSET;
result->timeRemaining = -1;
// At this point, we have a battery. Try to get as much values as possible.
if (ffReadFileBufferRelative(dfd, "manufacturer", &result->manufacturer)) {
ffStrbufTrimRightSpace(&result->manufacturer);
} else if (ffStrEquals(id, "macsmc-battery")) { // asahi
ffStrbufSetStatic(&result->manufacturer, "Apple Inc.");
}
if (ffReadFileBufferRelative(dfd, "model_name", &result->modelName)) {
ffStrbufTrimRightSpace(&result->modelName);
}
if (ffReadFileBufferRelative(dfd, "technology", &result->technology)) {
ffStrbufTrimRightSpace(&result->technology);
}
if (ffReadFileBufferRelative(dfd, "status", &tmpBuffer)) {
ffStrbufTrimRightSpace(&tmpBuffer);
}
// Unknown, Charging, Discharging, Not charging, Full
if (ffStrbufEqualS(&tmpBuffer, "Discharging")) {
result->status |= FF_BATTERY_STATUS_DISCHARGING;
FF_STRBUF_AUTO_DESTROY now = ffStrbufCreate();
if (ffReadFileBufferRelative(dfd, "time_to_empty_now", &now)) {
result->timeRemaining = (int32_t) ffStrbufToSInt(&now, 0);
} else {
if (ffReadFileBufferRelative(dfd, "charge_now", &now)) {
int64_t chargeNow = ffStrbufToSInt(&now, 0);
if (chargeNow > 0) {
if (ffReadFileBufferRelative(dfd, "current_now", &now)) {
int64_t currentNow = ffStrbufToSInt(&now, INT64_MIN);
if (currentNow < 0) {
currentNow = -currentNow;
}
if (currentNow > 0) {
result->timeRemaining = (int32_t) ((chargeNow * 3600) / currentNow);
}
}
}
}
}
} else if (ffStrbufEqualS(&tmpBuffer, "Charging")) {
result->status |= FF_BATTERY_STATUS_CHARGING;
} else if (ffStrbufEqualS(&tmpBuffer, "Unknown")) {
result->status |= FF_BATTERY_STATUS_UNKNOWN;
}
if (ffReadFileBufferRelative(dfd, "capacity_level", &tmpBuffer)) {
ffStrbufTrimRightSpace(&tmpBuffer);
if (ffStrbufEqualS(&tmpBuffer, "Critical")) {
result->status |= FF_BATTERY_STATUS_CRITICAL;
}
}
if (ffReadFileBufferRelative(dfd, "serial_number", &result->serial)) {
ffStrbufTrimRightSpace(&result->serial);
}
if (ffReadFileBufferRelative(dfd, "cycle_count", &tmpBuffer)) {
int64_t cycleCount = ffStrbufToSInt(&tmpBuffer, 0);
result->cycleCount = cycleCount < 0 || cycleCount > UINT32_MAX ? 0 : (uint32_t) cycleCount;
}
if (ffReadFileBufferRelative(dfd, "manufacture_year", &tmpBuffer)) {
int year = (int) ffStrbufToSInt(&tmpBuffer, 0);
if (year > 0) {
if (ffReadFileBufferRelative(dfd, "manufacture_month", &tmpBuffer)) {
int month = (int) ffStrbufToSInt(&tmpBuffer, 0);
if (month > 0) {
if (ffReadFileBufferRelative(dfd, "manufacture_day", &tmpBuffer)) {
int day = (int) ffStrbufToSInt(&tmpBuffer, 0);
if (day > 0) {
ffStrbufSetF(&result->manufactureDate, "%.4d-%.2d-%.2d", year, month, day);
}
}
}
}
}
}
if (options->temp) {
if (ffReadFileBufferRelative(dfd, "temp", &tmpBuffer)) {
result->temperature = ffStrbufToDouble(&tmpBuffer, FF_BATTERY_TEMP_UNSET);
if (result->temperature != FF_BATTERY_TEMP_UNSET) {
result->temperature /= 10;
}
}
}
FF_DEBUG("Battery \"%s\": Capacity: %.2f%%, Status: \"%x\", Time Remaining: %d seconds, Temperature: %.1f°C, Cycle Count: %u",
id,
result->capacity,
result->status,
result->timeRemaining,
result->temperature,
result->cycleCount);
return true;
}
const char* ffDetectBattery(FFBatteryOptions* options, FFlist* results) {
FF_AUTO_CLOSE_DIR DIR* dirp = opendir("/sys/class/power_supply/");
if (dirp == NULL) {
return "opendir(\"/sys/class/power_supply/\") == NULL";
}
bool acConnected = false;
struct dirent* entry;
while ((entry = readdir(dirp)) != NULL) {
if (entry->d_name[0] == '.') {
continue;
}
FF_AUTO_CLOSE_FD int dfd = openat(dirfd(dirp), entry->d_name, O_RDONLY | O_CLOEXEC | O_PATH | O_DIRECTORY);
if (dfd >= 0) {
parseBattery(dfd, entry->d_name, options, results, &acConnected);
}
}
if (acConnected) {
FF_LIST_FOR_EACH (FFBatteryResult, batt, *results) {
batt->status |= FF_BATTERY_STATUS_AC_CONNECTED;
}
}
return NULL;
}
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