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From 2ac7d7a818788110342a99978680485fbe27cc25 Mon Sep 17 00:00:00 2001
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From: Yu Watanabe <watanabe.yu+github@gmail.com>
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Date: Fri, 11 Nov 2022 13:54:03 +0900
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Subject: [PATCH] ac-power: check battery existence and status
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If a battery is not present or its status is not discharging, then
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the battery should not be used as a power source.
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Let's count batteries currently discharging.
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Fixes #25316.
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(cherry picked from commit 1c03f7f4ba419aa65997e90accc0d935ae1cfbc5)
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Related: #2138081
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---
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src/shared/udev-util.c | 58 ++++++++++++++++++++++++++++++++----------
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1 file changed, 44 insertions(+), 14 deletions(-)
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diff --git a/src/shared/udev-util.c b/src/shared/udev-util.c
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index aac02cd61b..7d95353452 100644
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--- a/src/shared/udev-util.c
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+++ b/src/shared/udev-util.c
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@@ -642,9 +642,46 @@ static int device_is_power_sink(sd_device *device) {
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return found_sink || !found_source;
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}
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+static bool battery_is_discharging(sd_device *d) {
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+ const char *val;
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+ int r;
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+
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+ assert(d);
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+
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+ r = sd_device_get_sysattr_value(d, "scope", &val;;
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+ if (r < 0) {
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+ if (r != -ENOENT)
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+ log_device_debug_errno(d, r, "Failed to read 'scope' sysfs attribute, ignoring: %m");
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+ } else if (streq(val, "Device")) {
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+ log_device_debug(d, "The power supply is a device battery, ignoring device.");
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+ return false;
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+ }
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+
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+ r = device_get_sysattr_bool(d, "present");
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+ if (r < 0)
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+ log_device_debug_errno(d, r, "Failed to read 'present' sysfs attribute, assuming the battery is present: %m");
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+ else if (r == 0) {
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+ log_device_debug(d, "The battery is not present, ignoring the power supply.");
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+ return false;
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+ }
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+
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+ /* Possible values: "Unknown", "Charging", "Discharging", "Not charging", "Full" */
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+ r = sd_device_get_sysattr_value(d, "status", &val;;
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+ if (r < 0) {
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+ log_device_debug_errno(d, r, "Failed to read 'status' sysfs attribute, assuming the battery is discharging: %m");
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+ return true;
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+ }
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+ if (!streq(val, "Discharging")) {
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+ log_device_debug(d, "The battery status is '%s', assuming the battery is not used as a power source of this machine.", val);
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+ return false;
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+ }
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+
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+ return true;
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+}
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+
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int on_ac_power(void) {
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_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
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- bool found_ac_online = false, found_battery = false;
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+ bool found_ac_online = false, found_discharging_battery = false;
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sd_device *d;
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int r;
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@@ -686,17 +723,10 @@ int on_ac_power(void) {
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}
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if (streq(val, "Battery")) {
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- r = sd_device_get_sysattr_value(d, "scope", &val;;
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- if (r < 0) {
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- if (r != -ENOENT)
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- log_device_debug_errno(d, r, "Failed to read 'scope' sysfs attribute, ignoring: %m");
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- } else if (streq(val, "Device")) {
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- log_device_debug(d, "The power supply is a device battery, ignoring device.");
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- continue;
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+ if (battery_is_discharging(d)) {
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+ found_discharging_battery = true;
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+ log_device_debug(d, "The power supply is a battery and currently discharging.");
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}
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-
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- found_battery = true;
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- log_device_debug(d, "The power supply is battery.");
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continue;
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}
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@@ -713,11 +743,11 @@ int on_ac_power(void) {
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if (found_ac_online) {
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log_debug("Found at least one online non-battery power supply, system is running on AC.");
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return true;
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- } else if (found_battery) {
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- log_debug("Found battery and no online power sources, assuming system is running from battery.");
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+ } else if (found_discharging_battery) {
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+ log_debug("Found at least one discharging battery and no online power sources, assuming system is running from battery.");
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return false;
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} else {
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- log_debug("No power supply reported online and no battery, assuming system is running on AC.");
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+ log_debug("No power supply reported online and no discharging battery found, assuming system is running on AC.");
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return true;
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}
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}
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