systemd/0052-ac-power-check-battery-existence-and-status.patch
Jan Macku 79350f79d8 systemd-252-2
Resolves: #2137584,#2138081,#2141979
2022-12-09 09:36:14 +01:00

107 lines
4.5 KiB
Diff

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