--- /dev/null
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "sd-device.h"
+
+#include "battery-capacity.h"
+#include "battery-util.h"
+#include "device-private.h"
+#include "device-util.h"
+#include "extract-word.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "hexdecoct.h"
+#include "id128-util.h"
+#include "parse-util.h"
+#include "siphash24.h"
+
+#define DISCHARGE_RATE_FILEPATH "/var/lib/systemd/sleep/battery_discharge_percentage_rate_per_hour"
+#define BATTERY_DISCHARGE_RATE_HASH_KEY SD_ID128_MAKE(5f,9a,20,18,38,76,46,07,8d,36,58,0b,bb,c4,e0,63)
+
+static void *CAPACITY_TO_PTR(int capacity) {
+ assert(capacity >= 0);
+ assert(capacity <= 100);
+ return INT_TO_PTR(capacity + 1);
+}
+
+static int PTR_TO_CAPACITY(void *p) {
+ int capacity = PTR_TO_INT(p) - 1;
+ assert(capacity >= 0);
+ assert(capacity <= 100);
+ return capacity;
+}
+
+int get_capacity_by_name(Hashmap *capacities_by_name, const char *name) {
+ void *p;
+
+ assert(capacities_by_name);
+ assert(name);
+
+ p = hashmap_get(capacities_by_name, name);
+ if (!p)
+ return -ENOENT;
+
+ return PTR_TO_CAPACITY(p);
+}
+
+/* Store current capacity of each battery before suspension and timestamp */
+int fetch_batteries_capacity_by_name(Hashmap **ret) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ _cleanup_hashmap_free_ Hashmap *batteries_capacity_by_name = NULL;
+ int r;
+
+ assert(ret);
+
+ batteries_capacity_by_name = hashmap_new(&string_hash_ops_free);
+ if (!batteries_capacity_by_name)
+ return log_oom_debug();
+
+ r = battery_enumerator_new(&e);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to initialize battery enumerator: %m");
+
+ FOREACH_DEVICE(e, dev) {
+ _cleanup_free_ char *battery_name_copy = NULL;
+ const char *battery_name;
+ int battery_capacity;
+
+ battery_capacity = r = battery_read_capacity_percentage(dev);
+ if (r < 0)
+ continue;
+
+ r = sd_device_get_property_value(dev, "POWER_SUPPLY_NAME", &battery_name);
+ if (r < 0) {
+ log_device_debug_errno(dev, r, "Failed to get POWER_SUPPLY_NAME property, ignoring: %m");
+ continue;
+ }
+
+ battery_name_copy = strdup(battery_name);
+ if (!battery_name_copy)
+ return log_oom_debug();
+
+ r = hashmap_put(batteries_capacity_by_name, battery_name_copy, CAPACITY_TO_PTR(battery_capacity));
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to store battery capacity: %m");
+
+ TAKE_PTR(battery_name_copy);
+ }
+
+ *ret = TAKE_PTR(batteries_capacity_by_name);
+
+ return 0;
+}
+
+static int siphash24_compress_device_sysattr(sd_device *dev, const char *attr, struct siphash *state) {
+ const char *x;
+ int r;
+
+ assert(dev);
+ assert(attr);
+ assert(state);
+
+ r = sd_device_get_sysattr_value(dev, attr, &x);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to read '%s' attribute: %m", attr);
+
+ if (!isempty(x))
+ siphash24_compress_string(x, state);
+
+ return 0;
+}
+
+static int siphash24_compress_id128(int (*getter)(sd_id128_t*), const char *name, struct siphash *state) {
+ sd_id128_t id;
+ int r;
+
+ assert(getter);
+ assert(state);
+
+ r = getter(&id);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to get %s ID: %m", name);
+
+ siphash24_compress(&id, sizeof(sd_id128_t), state);
+ return 0;
+}
+
+/* Read system and battery identifier from specific location and generate hash of it */
+static int get_system_battery_identifier_hash(sd_device *dev, uint64_t *ret) {
+ struct siphash state;
+
+ assert(ret);
+ assert(dev);
+
+ siphash24_init(&state, BATTERY_DISCHARGE_RATE_HASH_KEY.bytes);
+
+ (void) siphash24_compress_device_sysattr(dev, "manufacturer", &state);
+ (void) siphash24_compress_device_sysattr(dev, "model_name", &state);
+ (void) siphash24_compress_device_sysattr(dev, "serial_number", &state);
+ (void) siphash24_compress_id128(sd_id128_get_machine, "machine", &state);
+ (void) siphash24_compress_id128(id128_get_product, "product", &state);
+
+ *ret = siphash24_finalize(&state);
+ return 0;
+}
+
+/* Return success if battery percentage discharge rate per hour is in the range 1–199 */
+static bool battery_discharge_rate_is_valid(int battery_discharge_rate) {
+ return battery_discharge_rate > 0 && battery_discharge_rate < 200;
+}
+
+/* Battery percentage discharge rate per hour is read from specific file. It is stored along with system
+ * and battery identifier hash to maintain the integrity of discharge rate value */
+static int get_battery_discharge_rate(sd_device *dev, int *ret) {
+ _cleanup_fclose_ FILE *f = NULL;
+ uint64_t current_hash_id;
+ const char *p;
+ int r;
+
+ assert(dev);
+ assert(ret);
+
+ f = fopen(DISCHARGE_RATE_FILEPATH, "re");
+ if (!f)
+ return log_debug_errno(errno, "Failed to read discharge rate from " DISCHARGE_RATE_FILEPATH ": %m");
+
+ r = get_system_battery_identifier_hash(dev, ¤t_hash_id);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to generate system battery identifier hash: %m");
+
+ for (;;) {
+ _cleanup_free_ char *stored_hash_id = NULL, *stored_discharge_rate = NULL, *line = NULL;
+ uint64_t hash_id;
+ int discharge_rate;
+
+ r = read_line(f, LONG_LINE_MAX, &line);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to read discharge rate from " DISCHARGE_RATE_FILEPATH ": %m");
+ if (r == 0)
+ break;
+
+ p = line;
+ r = extract_many_words(&p, NULL, 0, &stored_hash_id, &stored_discharge_rate, NULL);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to parse hash_id and discharge_rate read from " DISCHARGE_RATE_FILEPATH ": %m");
+ if (r != 2)
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid number of items fetched from " DISCHARGE_RATE_FILEPATH);
+
+ r = safe_atou64(stored_hash_id, &hash_id);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to parse hash ID read from " DISCHARGE_RATE_FILEPATH " location: %m");
+
+ if (current_hash_id != hash_id)
+ /* matching device not found, move to next line */
+ continue;
+
+ r = safe_atoi(stored_discharge_rate, &discharge_rate);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to parse discharge rate read from " DISCHARGE_RATE_FILEPATH ": %m");
+
+ if (!battery_discharge_rate_is_valid(discharge_rate))
+ return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ERANGE), "Invalid battery discharge percentage rate per hour: %m");
+
+ *ret = discharge_rate;
+ return 0; /* matching device found, exit iteration */
+ }
+
+ return -ENOENT;
+}
+
+/* Write battery percentage discharge rate per hour along with system and battery identifier hash to file */
+static int put_battery_discharge_rate(int estimated_battery_discharge_rate, uint64_t system_hash_id, bool trunc) {
+ int r;
+
+ if (!battery_discharge_rate_is_valid(estimated_battery_discharge_rate))
+ return log_debug_errno(SYNTHETIC_ERRNO(ERANGE),
+ "Invalid battery discharge rate %d%% per hour: %m",
+ estimated_battery_discharge_rate);
+
+ r = write_string_filef(
+ DISCHARGE_RATE_FILEPATH,
+ WRITE_STRING_FILE_CREATE | WRITE_STRING_FILE_MKDIR_0755 | (trunc ? WRITE_STRING_FILE_TRUNCATE : 0),
+ "%"PRIu64" %d",
+ system_hash_id,
+ estimated_battery_discharge_rate);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to update %s: %m", DISCHARGE_RATE_FILEPATH);
+
+ log_debug("Estimated discharge rate %d%% per hour successfully saved to %s", estimated_battery_discharge_rate, DISCHARGE_RATE_FILEPATH);
+
+ return 0;
+}
+
+/* Estimate battery discharge rate using stored previous and current capacity over timestamp difference */
+int estimate_battery_discharge_rate_per_hour(
+ Hashmap *last_capacity,
+ Hashmap *current_capacity,
+ usec_t before_timestamp,
+ usec_t after_timestamp) {
+
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ bool trunc = true;
+ int r;
+
+ assert(last_capacity);
+ assert(current_capacity);
+ assert(before_timestamp < after_timestamp);
+
+ r = battery_enumerator_new(&e);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to initialize battery enumerator: %m");
+
+ FOREACH_DEVICE(e, dev) {
+ int battery_last_capacity, battery_current_capacity, battery_discharge_rate;
+ const char *battery_name;
+ uint64_t system_hash_id;
+
+ r = sd_device_get_property_value(dev, "POWER_SUPPLY_NAME", &battery_name);
+ if (r < 0) {
+ log_device_debug_errno(dev, r, "Failed to read battery name, ignoring: %m");
+ continue;
+ }
+
+ battery_last_capacity = get_capacity_by_name(last_capacity, battery_name);
+ if (battery_last_capacity < 0)
+ continue;
+
+ battery_current_capacity = get_capacity_by_name(current_capacity, battery_name);
+ if (battery_current_capacity < 0)
+ continue;
+
+ if (battery_current_capacity >= battery_last_capacity) {
+ log_device_debug(dev, "Battery was not discharged during suspension");
+ continue;
+ }
+
+ r = get_system_battery_identifier_hash(dev, &system_hash_id);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to generate system battery identifier hash: %m");
+
+ log_device_debug(dev,
+ "%d%% was discharged in %s. Estimating discharge rate...",
+ battery_last_capacity - battery_current_capacity,
+ FORMAT_TIMESPAN(after_timestamp - before_timestamp, USEC_PER_SEC));
+
+ battery_discharge_rate = (battery_last_capacity - battery_current_capacity) * USEC_PER_HOUR / (after_timestamp - before_timestamp);
+ r = put_battery_discharge_rate(battery_discharge_rate, system_hash_id, trunc);
+ if (r < 0)
+ log_device_warning_errno(dev, r, "Failed to update battery discharge rate, ignoring: %m");
+ else
+ trunc = false;
+ }
+
+ return 0;
+}
+
+/* Calculate the suspend interval for each battery and then return their sum */
+int get_total_suspend_interval(Hashmap *last_capacity, usec_t *ret) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ usec_t total_suspend_interval = 0;
+ int r;
+
+ assert(last_capacity);
+ assert(ret);
+
+ r = battery_enumerator_new(&e);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to initialize battery enumerator: %m");
+
+ FOREACH_DEVICE(e, dev) {
+ int battery_last_capacity, previous_discharge_rate = 0;
+ const char *battery_name;
+ usec_t suspend_interval;
+
+ r = sd_device_get_property_value(dev, "POWER_SUPPLY_NAME", &battery_name);
+ if (r < 0) {
+ log_device_debug_errno(dev, r, "Failed to read battery name, ignoring: %m");
+ continue;
+ }
+
+ battery_last_capacity = get_capacity_by_name(last_capacity, battery_name);
+ if (battery_last_capacity <= 0)
+ continue;
+
+ r = get_battery_discharge_rate(dev, &previous_discharge_rate);
+ if (r < 0) {
+ log_device_debug_errno(dev, r, "Failed to get discharge rate, ignoring: %m");
+ continue;
+ }
+
+ if (previous_discharge_rate == 0)
+ continue;
+
+ if (battery_last_capacity * 2 <= previous_discharge_rate) {
+ log_device_debug(dev, "Current battery capacity percentage too low compared to discharge rate");
+ continue;
+ }
+ suspend_interval = battery_last_capacity * USEC_PER_HOUR / previous_discharge_rate;
+
+ total_suspend_interval = usec_add(total_suspend_interval, suspend_interval);
+ }
+ /* Previous discharge rate is stored in per hour basis converted to usec.
+ * Subtract 30 minutes from the result to keep a buffer of 30 minutes before battery gets critical */
+ total_suspend_interval = usec_sub_unsigned(total_suspend_interval, 30 * USEC_PER_MINUTE);
+ if (total_suspend_interval == 0)
+ return -ENOENT;
+
+ *ret = total_suspend_interval;
+
+ return 0;
+}
+
+/* Return true if all batteries have acpi_btp support */
+int battery_trip_point_alarm_exists(void) {
+ _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
+ int r;
+
+ r = battery_enumerator_new(&e);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to initialize battery enumerator: %m");
+
+ FOREACH_DEVICE(e, dev) {
+ int battery_alarm;
+ const char *s;
+
+ r = sd_device_get_sysattr_value(dev, "alarm", &s);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to read battery alarm: %m");
+
+ r = safe_atoi(s, &battery_alarm);
+ if (r < 0)
+ return log_device_debug_errno(dev, r, "Failed to parse battery alarm: %m");
+ if (battery_alarm <= 0)
+ return false;
+ }
+
+ return true;
+}
projects / thirdparty / systemd.git / commitdiff
