From 55944e5e40b1be2afc4855d8d2baf4b73d1876b5 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 22:49:52 +0200 Subject: Adding upstream version 255.4. Signed-off-by: Daniel Baumann --- src/shared/battery-util.c | 283 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 283 insertions(+) create mode 100644 src/shared/battery-util.c (limited to 'src/shared/battery-util.c') diff --git a/src/shared/battery-util.c b/src/shared/battery-util.c new file mode 100644 index 0000000..37b3f6a --- /dev/null +++ b/src/shared/battery-util.c @@ -0,0 +1,283 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "sd-device.h" + +#include "device-private.h" +#include "device-util.h" +#include "string-util.h" +#include "battery-util.h" + +#define BATTERY_LOW_CAPACITY_LEVEL 5 + +static int device_is_power_sink(sd_device *device) { + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + bool found_source = false, found_sink = false; + sd_device *parent; + int r; + + assert(device); + + /* USB-C power supply device has two power roles: source or sink. See, + * https://docs.kernel.org/admin-guide/abi-testing.html#abi-file-testing-sysfs-class-typec */ + + r = sd_device_enumerator_new(&e); + if (r < 0) + return r; + + r = sd_device_enumerator_allow_uninitialized(e); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_subsystem(e, "typec", true); + if (r < 0) + return r; + + r = sd_device_get_parent(device, &parent); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_parent(e, parent); + if (r < 0) + return r; + + FOREACH_DEVICE(e, d) { + const char *val; + + r = sd_device_get_sysattr_value(d, "power_role", &val); + if (r < 0) { + if (r != -ENOENT) + log_device_debug_errno(d, r, "Failed to read 'power_role' sysfs attribute, ignoring: %m"); + continue; + } + + if (strstr(val, "[source]")) { + found_source = true; + log_device_debug(d, "The USB type-C port is in power source mode."); + } else if (strstr(val, "[sink]")) { + found_sink = true; + log_device_debug(d, "The USB type-C port is in power sink mode."); + } + } + + if (found_sink) + log_device_debug(device, "The USB type-C device has at least one port in power sink mode."); + else if (!found_source) + log_device_debug(device, "The USB type-C device has no port in power source mode, assuming the device is in power sink mode."); + else + log_device_debug(device, "All USB type-C ports are in power source mode."); + + 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_discharging_battery = false; + int r; + + r = sd_device_enumerator_new(&e); + if (r < 0) + return r; + + r = sd_device_enumerator_allow_uninitialized(e); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_subsystem(e, "power_supply", true); + if (r < 0) + return r; + + FOREACH_DEVICE(e, d) { + /* See + * https://github.com/torvalds/linux/blob/4eef766b7d4d88f0b984781bc1bcb574a6eafdc7/include/linux/power_supply.h#L176 + * for defined power source types. Also see: + * https://docs.kernel.org/admin-guide/abi-testing.html#abi-file-testing-sysfs-class-power */ + + const char *val; + r = sd_device_get_sysattr_value(d, "type", &val); + if (r < 0) { + log_device_debug_errno(d, r, "Failed to read 'type' sysfs attribute, ignoring device: %m"); + continue; + } + + /* Ignore USB-C power supply in source mode. See issue #21988. */ + if (streq(val, "USB")) { + r = device_is_power_sink(d); + if (r <= 0) { + if (r < 0) + log_device_debug_errno(d, r, "Failed to determine the current power role, ignoring device: %m"); + else + log_device_debug(d, "USB power supply is in source mode, ignoring device."); + continue; + } + } + + if (streq(val, "Battery")) { + if (battery_is_discharging(d)) { + found_discharging_battery = true; + log_device_debug(d, "The power supply is a battery and currently discharging."); + } + continue; + } + + r = device_get_sysattr_unsigned(d, "online", NULL); + if (r < 0) { + log_device_debug_errno(d, r, "Failed to query 'online' sysfs attribute, ignoring device: %m"); + continue; + } else if (r > 0) /* At least 1 and 2 are defined as different types of 'online' */ + found_ac_online = true; + + log_device_debug(d, "The power supply is currently %s.", r > 0 ? "online" : "offline"); + } + + 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_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 discharging battery found, assuming system is running on AC."); + return true; + } +} + +/* Get the list of batteries */ +int battery_enumerator_new(sd_device_enumerator **ret) { + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + int r; + + assert(ret); + + r = sd_device_enumerator_new(&e); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_subsystem(e, "power_supply", /* match = */ true); + if (r < 0) + return r; + + r = sd_device_enumerator_allow_uninitialized(e); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_sysattr(e, "type", "Battery", /* match = */ true); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_sysattr(e, "present", "1", /* match = */ true); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_sysattr(e, "scope", "Device", /* match = */ false); + if (r < 0) + return r; + + *ret = TAKE_PTR(e); + return 0; +} + +/* Battery percentage capacity fetched from capacity file and if in range 0-100 then returned */ +int battery_read_capacity_percentage(sd_device *dev) { + int battery_capacity, r; + + assert(dev); + + r = device_get_sysattr_int(dev, "capacity", &battery_capacity); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to read/parse POWER_SUPPLY_CAPACITY: %m"); + + if (battery_capacity < 0 || battery_capacity > 100) + return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ERANGE), "Invalid battery capacity: %d", battery_capacity); + + return battery_capacity; +} + +/* If a battery whose percentage capacity is <= 5% exists, and we're not on AC power, return success */ +int battery_is_discharging_and_low(void) { + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + bool unsure = false, found_low = false; + int r; + + /* We have not used battery capacity_level since value is set to full + * or Normal in case ACPI is not working properly. In case of no battery + * 0 will be returned and system will be suspended for 1st cycle then hibernated */ + + r = on_ac_power(); + if (r < 0) + log_warning_errno(r, "Failed to check if the system is running on AC, assuming it is not: %m"); + if (r > 0) + return false; + + r = battery_enumerator_new(&e); + if (r < 0) + return log_error_errno(r, "Failed to initialize battery enumerator: %m"); + + FOREACH_DEVICE(e, dev) { + int level; + + level = battery_read_capacity_percentage(dev); + if (level < 0) { + unsure = true; + continue; + } + + if (level > BATTERY_LOW_CAPACITY_LEVEL) { /* Found a charged battery */ + log_device_full(dev, + found_low ? LOG_INFO : LOG_DEBUG, + "Found battery with capacity above threshold (%d%% > %d%%).", + level, BATTERY_LOW_CAPACITY_LEVEL); + return false; + } + + log_device_info(dev, + "Found battery with capacity below threshold (%d%% <= %d%%).", + level, BATTERY_LOW_CAPACITY_LEVEL); + found_low = true; + } + + /* If we found a battery whose state we couldn't read, don't assume we are in low battery state */ + if (unsure) { + log_notice("Found battery with unreadable state, assuming not in low battery state."); + return false; + } + + /* If found neither charged nor low batteries, assume that we aren't in low battery state */ + return found_low; +} -- cgit v1.2.3