1 // SPDX-License-Identifier: GPL-2.0-only
3 * Universal power supply monitor class
5 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
6 * Copyright © 2004 Szabolcs Gyurko
7 * Copyright © 2003 Ian Molton <spyro@f2s.com>
9 * Modified: 2004, Oct Szabolcs Gyurko
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/delay.h>
17 #include <linux/device.h>
18 #include <linux/notifier.h>
19 #include <linux/err.h>
21 #include <linux/power_supply.h>
22 #include <linux/property.h>
23 #include <linux/thermal.h>
24 #include <linux/fixp-arith.h>
25 #include "power_supply.h"
26 #include "samsung-sdi-battery.h"
28 /* exported for the APM Power driver, APM emulation */
29 struct class *power_supply_class;
30 EXPORT_SYMBOL_GPL(power_supply_class);
32 ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
33 EXPORT_SYMBOL_GPL(power_supply_notifier);
35 static struct device_type power_supply_dev_type;
37 #define POWER_SUPPLY_DEFERRED_REGISTER_TIME msecs_to_jiffies(10)
39 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
40 struct power_supply *supply)
44 if (!supply->supplied_from && !supplier->supplied_to)
47 /* Support both supplied_to and supplied_from modes */
48 if (supply->supplied_from) {
49 if (!supplier->desc->name)
51 for (i = 0; i < supply->num_supplies; i++)
52 if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
55 if (!supply->desc->name)
57 for (i = 0; i < supplier->num_supplicants; i++)
58 if (!strcmp(supplier->supplied_to[i], supply->desc->name))
65 static int __power_supply_changed_work(struct device *dev, void *data)
67 struct power_supply *psy = data;
68 struct power_supply *pst = dev_get_drvdata(dev);
70 if (__power_supply_is_supplied_by(psy, pst)) {
71 if (pst->desc->external_power_changed)
72 pst->desc->external_power_changed(pst);
78 static void power_supply_changed_work(struct work_struct *work)
81 struct power_supply *psy = container_of(work, struct power_supply,
84 dev_dbg(&psy->dev, "%s\n", __func__);
86 spin_lock_irqsave(&psy->changed_lock, flags);
88 * Check 'changed' here to avoid issues due to race between
89 * power_supply_changed() and this routine. In worst case
90 * power_supply_changed() can be called again just before we take above
91 * lock. During the first call of this routine we will mark 'changed' as
92 * false and it will stay false for the next call as well.
94 if (likely(psy->changed)) {
96 spin_unlock_irqrestore(&psy->changed_lock, flags);
97 class_for_each_device(power_supply_class, NULL, psy,
98 __power_supply_changed_work);
99 power_supply_update_leds(psy);
100 atomic_notifier_call_chain(&power_supply_notifier,
101 PSY_EVENT_PROP_CHANGED, psy);
102 kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
103 spin_lock_irqsave(&psy->changed_lock, flags);
107 * Hold the wakeup_source until all events are processed.
108 * power_supply_changed() might have called again and have set 'changed'
111 if (likely(!psy->changed))
113 spin_unlock_irqrestore(&psy->changed_lock, flags);
116 void power_supply_changed(struct power_supply *psy)
120 dev_dbg(&psy->dev, "%s\n", __func__);
122 spin_lock_irqsave(&psy->changed_lock, flags);
124 pm_stay_awake(&psy->dev);
125 spin_unlock_irqrestore(&psy->changed_lock, flags);
126 schedule_work(&psy->changed_work);
128 EXPORT_SYMBOL_GPL(power_supply_changed);
131 * Notify that power supply was registered after parent finished the probing.
133 * Often power supply is registered from driver's probe function. However
134 * calling power_supply_changed() directly from power_supply_register()
135 * would lead to execution of get_property() function provided by the driver
136 * too early - before the probe ends.
138 * Avoid that by waiting on parent's mutex.
140 static void power_supply_deferred_register_work(struct work_struct *work)
142 struct power_supply *psy = container_of(work, struct power_supply,
143 deferred_register_work.work);
145 if (psy->dev.parent) {
146 while (!mutex_trylock(&psy->dev.parent->mutex)) {
153 power_supply_changed(psy);
156 mutex_unlock(&psy->dev.parent->mutex);
160 static int __power_supply_populate_supplied_from(struct device *dev,
163 struct power_supply *psy = data;
164 struct power_supply *epsy = dev_get_drvdata(dev);
165 struct device_node *np;
169 np = of_parse_phandle(psy->of_node, "power-supplies", i++);
173 if (np == epsy->of_node) {
174 dev_dbg(&psy->dev, "%s: Found supply : %s\n",
175 psy->desc->name, epsy->desc->name);
176 psy->supplied_from[i-1] = (char *)epsy->desc->name;
187 static int power_supply_populate_supplied_from(struct power_supply *psy)
191 error = class_for_each_device(power_supply_class, NULL, psy,
192 __power_supply_populate_supplied_from);
194 dev_dbg(&psy->dev, "%s %d\n", __func__, error);
199 static int __power_supply_find_supply_from_node(struct device *dev,
202 struct device_node *np = data;
203 struct power_supply *epsy = dev_get_drvdata(dev);
205 /* returning non-zero breaks out of class_for_each_device loop */
206 if (epsy->of_node == np)
212 static int power_supply_find_supply_from_node(struct device_node *supply_node)
217 * class_for_each_device() either returns its own errors or values
218 * returned by __power_supply_find_supply_from_node().
220 * __power_supply_find_supply_from_node() will return 0 (no match)
223 * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
224 * it returned 0, or error as returned by it.
226 error = class_for_each_device(power_supply_class, NULL, supply_node,
227 __power_supply_find_supply_from_node);
229 return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
232 static int power_supply_check_supplies(struct power_supply *psy)
234 struct device_node *np;
237 /* If there is already a list honor it */
238 if (psy->supplied_from && psy->num_supplies > 0)
241 /* No device node found, nothing to do */
248 np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
252 ret = power_supply_find_supply_from_node(np);
256 dev_dbg(&psy->dev, "Failed to find supply!\n");
261 /* Missing valid "power-supplies" entries */
265 /* All supplies found, allocate char ** array for filling */
266 psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(*psy->supplied_from),
268 if (!psy->supplied_from)
271 *psy->supplied_from = devm_kcalloc(&psy->dev,
272 cnt - 1, sizeof(**psy->supplied_from),
274 if (!*psy->supplied_from)
277 return power_supply_populate_supplied_from(psy);
280 static int power_supply_check_supplies(struct power_supply *psy)
284 if (!psy->dev.parent)
287 nval = device_property_string_array_count(psy->dev.parent, "supplied-from");
291 psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
292 sizeof(char *), GFP_KERNEL);
293 if (!psy->supplied_from)
296 ret = device_property_read_string_array(psy->dev.parent,
297 "supplied-from", (const char **)psy->supplied_from, nval);
301 psy->num_supplies = nval;
307 struct psy_am_i_supplied_data {
308 struct power_supply *psy;
312 static int __power_supply_am_i_supplied(struct device *dev, void *_data)
314 union power_supply_propval ret = {0,};
315 struct power_supply *epsy = dev_get_drvdata(dev);
316 struct psy_am_i_supplied_data *data = _data;
318 if (__power_supply_is_supplied_by(epsy, data->psy)) {
320 if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
328 int power_supply_am_i_supplied(struct power_supply *psy)
330 struct psy_am_i_supplied_data data = { psy, 0 };
333 error = class_for_each_device(power_supply_class, NULL, &data,
334 __power_supply_am_i_supplied);
336 dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
343 EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
345 static int __power_supply_is_system_supplied(struct device *dev, void *data)
347 union power_supply_propval ret = {0,};
348 struct power_supply *psy = dev_get_drvdata(dev);
349 unsigned int *count = data;
351 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_SCOPE, &ret))
352 if (ret.intval == POWER_SUPPLY_SCOPE_DEVICE)
356 if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
357 if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
364 int power_supply_is_system_supplied(void)
367 unsigned int count = 0;
369 error = class_for_each_device(power_supply_class, NULL, &count,
370 __power_supply_is_system_supplied);
373 * If no system scope power class device was found at all, most probably we
374 * are running on a desktop system, so assume we are on mains power.
381 EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
383 struct psy_get_supplier_prop_data {
384 struct power_supply *psy;
385 enum power_supply_property psp;
386 union power_supply_propval *val;
389 static int __power_supply_get_supplier_property(struct device *dev, void *_data)
391 struct power_supply *epsy = dev_get_drvdata(dev);
392 struct psy_get_supplier_prop_data *data = _data;
394 if (__power_supply_is_supplied_by(epsy, data->psy))
395 if (!power_supply_get_property(epsy, data->psp, data->val))
396 return 1; /* Success */
398 return 0; /* Continue iterating */
401 int power_supply_get_property_from_supplier(struct power_supply *psy,
402 enum power_supply_property psp,
403 union power_supply_propval *val)
405 struct psy_get_supplier_prop_data data = {
413 * This function is not intended for use with a supply with multiple
414 * suppliers, we simply pick the first supply to report the psp.
416 ret = class_for_each_device(power_supply_class, NULL, &data,
417 __power_supply_get_supplier_property);
425 EXPORT_SYMBOL_GPL(power_supply_get_property_from_supplier);
427 int power_supply_set_battery_charged(struct power_supply *psy)
429 if (atomic_read(&psy->use_cnt) >= 0 &&
430 psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
431 psy->desc->set_charged) {
432 psy->desc->set_charged(psy);
438 EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
440 static int power_supply_match_device_by_name(struct device *dev, const void *data)
442 const char *name = data;
443 struct power_supply *psy = dev_get_drvdata(dev);
445 return strcmp(psy->desc->name, name) == 0;
449 * power_supply_get_by_name() - Search for a power supply and returns its ref
450 * @name: Power supply name to fetch
452 * If power supply was found, it increases reference count for the
453 * internal power supply's device. The user should power_supply_put()
456 * Return: On success returns a reference to a power supply with
457 * matching name equals to @name, a NULL otherwise.
459 struct power_supply *power_supply_get_by_name(const char *name)
461 struct power_supply *psy = NULL;
462 struct device *dev = class_find_device(power_supply_class, NULL, name,
463 power_supply_match_device_by_name);
466 psy = dev_get_drvdata(dev);
467 atomic_inc(&psy->use_cnt);
472 EXPORT_SYMBOL_GPL(power_supply_get_by_name);
475 * power_supply_put() - Drop reference obtained with power_supply_get_by_name
476 * @psy: Reference to put
478 * The reference to power supply should be put before unregistering
481 void power_supply_put(struct power_supply *psy)
485 atomic_dec(&psy->use_cnt);
486 put_device(&psy->dev);
488 EXPORT_SYMBOL_GPL(power_supply_put);
491 static int power_supply_match_device_node(struct device *dev, const void *data)
493 return dev->parent && dev->parent->of_node == data;
497 * power_supply_get_by_phandle() - Search for a power supply and returns its ref
498 * @np: Pointer to device node holding phandle property
499 * @property: Name of property holding a power supply name
501 * If power supply was found, it increases reference count for the
502 * internal power supply's device. The user should power_supply_put()
505 * Return: On success returns a reference to a power supply with
506 * matching name equals to value under @property, NULL or ERR_PTR otherwise.
508 struct power_supply *power_supply_get_by_phandle(struct device_node *np,
509 const char *property)
511 struct device_node *power_supply_np;
512 struct power_supply *psy = NULL;
515 power_supply_np = of_parse_phandle(np, property, 0);
516 if (!power_supply_np)
517 return ERR_PTR(-ENODEV);
519 dev = class_find_device(power_supply_class, NULL, power_supply_np,
520 power_supply_match_device_node);
522 of_node_put(power_supply_np);
525 psy = dev_get_drvdata(dev);
526 atomic_inc(&psy->use_cnt);
531 EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
533 static void devm_power_supply_put(struct device *dev, void *res)
535 struct power_supply **psy = res;
537 power_supply_put(*psy);
541 * devm_power_supply_get_by_phandle() - Resource managed version of
542 * power_supply_get_by_phandle()
543 * @dev: Pointer to device holding phandle property
544 * @property: Name of property holding a power supply phandle
546 * Return: On success returns a reference to a power supply with
547 * matching name equals to value under @property, NULL or ERR_PTR otherwise.
549 struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
550 const char *property)
552 struct power_supply **ptr, *psy;
555 return ERR_PTR(-ENODEV);
557 ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
559 return ERR_PTR(-ENOMEM);
561 psy = power_supply_get_by_phandle(dev->of_node, property);
562 if (IS_ERR_OR_NULL(psy)) {
566 devres_add(dev, ptr);
570 EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
571 #endif /* CONFIG_OF */
573 int power_supply_get_battery_info(struct power_supply *psy,
574 struct power_supply_battery_info **info_out)
576 struct power_supply_resistance_temp_table *resist_table;
577 struct power_supply_battery_info *info;
578 struct device_node *battery_np = NULL;
579 struct fwnode_reference_args args;
580 struct fwnode_handle *fwnode = NULL;
587 battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
591 fwnode = fwnode_handle_get(of_fwnode_handle(battery_np));
592 } else if (psy->dev.parent) {
593 err = fwnode_property_get_reference_args(
594 dev_fwnode(psy->dev.parent),
595 "monitored-battery", NULL, 0, 0, &args);
599 fwnode = args.fwnode;
605 err = fwnode_property_read_string(fwnode, "compatible", &value);
610 /* Try static batteries first */
611 err = samsung_sdi_battery_get_info(&psy->dev, value, &info);
613 goto out_ret_pointer;
614 else if (err == -ENODEV)
616 * Device does not have a static battery.
617 * Proceed to look for a simple battery.
621 if (strcmp("simple-battery", value)) {
626 info = devm_kzalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
632 info->technology = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
633 info->energy_full_design_uwh = -EINVAL;
634 info->charge_full_design_uah = -EINVAL;
635 info->voltage_min_design_uv = -EINVAL;
636 info->voltage_max_design_uv = -EINVAL;
637 info->precharge_current_ua = -EINVAL;
638 info->charge_term_current_ua = -EINVAL;
639 info->constant_charge_current_max_ua = -EINVAL;
640 info->constant_charge_voltage_max_uv = -EINVAL;
641 info->tricklecharge_current_ua = -EINVAL;
642 info->precharge_voltage_max_uv = -EINVAL;
643 info->charge_restart_voltage_uv = -EINVAL;
644 info->overvoltage_limit_uv = -EINVAL;
645 info->maintenance_charge = NULL;
646 info->alert_low_temp_charge_current_ua = -EINVAL;
647 info->alert_low_temp_charge_voltage_uv = -EINVAL;
648 info->alert_high_temp_charge_current_ua = -EINVAL;
649 info->alert_high_temp_charge_voltage_uv = -EINVAL;
650 info->temp_ambient_alert_min = INT_MIN;
651 info->temp_ambient_alert_max = INT_MAX;
652 info->temp_alert_min = INT_MIN;
653 info->temp_alert_max = INT_MAX;
654 info->temp_min = INT_MIN;
655 info->temp_max = INT_MAX;
656 info->factory_internal_resistance_uohm = -EINVAL;
657 info->resist_table = NULL;
658 info->bti_resistance_ohm = -EINVAL;
659 info->bti_resistance_tolerance = -EINVAL;
661 for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
662 info->ocv_table[index] = NULL;
663 info->ocv_temp[index] = -EINVAL;
664 info->ocv_table_size[index] = -EINVAL;
667 /* The property and field names below must correspond to elements
668 * in enum power_supply_property. For reasoning, see
669 * Documentation/power/power_supply_class.rst.
672 if (!fwnode_property_read_string(fwnode, "device-chemistry", &value)) {
673 if (!strcmp("nickel-cadmium", value))
674 info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
675 else if (!strcmp("nickel-metal-hydride", value))
676 info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
677 else if (!strcmp("lithium-ion", value))
678 /* Imprecise lithium-ion type */
679 info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
680 else if (!strcmp("lithium-ion-polymer", value))
681 info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
682 else if (!strcmp("lithium-ion-iron-phosphate", value))
683 info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
684 else if (!strcmp("lithium-ion-manganese-oxide", value))
685 info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
687 dev_warn(&psy->dev, "%s unknown battery type\n", value);
690 fwnode_property_read_u32(fwnode, "energy-full-design-microwatt-hours",
691 &info->energy_full_design_uwh);
692 fwnode_property_read_u32(fwnode, "charge-full-design-microamp-hours",
693 &info->charge_full_design_uah);
694 fwnode_property_read_u32(fwnode, "voltage-min-design-microvolt",
695 &info->voltage_min_design_uv);
696 fwnode_property_read_u32(fwnode, "voltage-max-design-microvolt",
697 &info->voltage_max_design_uv);
698 fwnode_property_read_u32(fwnode, "trickle-charge-current-microamp",
699 &info->tricklecharge_current_ua);
700 fwnode_property_read_u32(fwnode, "precharge-current-microamp",
701 &info->precharge_current_ua);
702 fwnode_property_read_u32(fwnode, "precharge-upper-limit-microvolt",
703 &info->precharge_voltage_max_uv);
704 fwnode_property_read_u32(fwnode, "charge-term-current-microamp",
705 &info->charge_term_current_ua);
706 fwnode_property_read_u32(fwnode, "re-charge-voltage-microvolt",
707 &info->charge_restart_voltage_uv);
708 fwnode_property_read_u32(fwnode, "over-voltage-threshold-microvolt",
709 &info->overvoltage_limit_uv);
710 fwnode_property_read_u32(fwnode, "constant-charge-current-max-microamp",
711 &info->constant_charge_current_max_ua);
712 fwnode_property_read_u32(fwnode, "constant-charge-voltage-max-microvolt",
713 &info->constant_charge_voltage_max_uv);
714 fwnode_property_read_u32(fwnode, "factory-internal-resistance-micro-ohms",
715 &info->factory_internal_resistance_uohm);
717 if (!fwnode_property_read_u32_array(fwnode, "ambient-celsius",
718 min_max, ARRAY_SIZE(min_max))) {
719 info->temp_ambient_alert_min = min_max[0];
720 info->temp_ambient_alert_max = min_max[1];
722 if (!fwnode_property_read_u32_array(fwnode, "alert-celsius",
723 min_max, ARRAY_SIZE(min_max))) {
724 info->temp_alert_min = min_max[0];
725 info->temp_alert_max = min_max[1];
727 if (!fwnode_property_read_u32_array(fwnode, "operating-range-celsius",
728 min_max, ARRAY_SIZE(min_max))) {
729 info->temp_min = min_max[0];
730 info->temp_max = min_max[1];
734 * The below code uses raw of-data parsing to parse
735 * /schemas/types.yaml#/definitions/uint32-matrix
736 * data, so for now this is only support with of.
739 goto out_ret_pointer;
741 len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
742 if (len < 0 && len != -EINVAL) {
745 } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
746 dev_err(&psy->dev, "Too many temperature values\n");
749 } else if (len > 0) {
750 of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
751 info->ocv_temp, len);
754 for (index = 0; index < len; index++) {
755 struct power_supply_battery_ocv_table *table;
757 int i, tab_len, size;
759 propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
761 power_supply_put_battery_info(psy, info);
765 list = of_get_property(battery_np, propname, &size);
766 if (!list || !size) {
767 dev_err(&psy->dev, "failed to get %s\n", propname);
769 power_supply_put_battery_info(psy, info);
775 tab_len = size / (2 * sizeof(__be32));
776 info->ocv_table_size[index] = tab_len;
778 table = info->ocv_table[index] =
779 devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
780 if (!info->ocv_table[index]) {
781 power_supply_put_battery_info(psy, info);
786 for (i = 0; i < tab_len; i++) {
787 table[i].ocv = be32_to_cpu(*list);
789 table[i].capacity = be32_to_cpu(*list);
794 list = of_get_property(battery_np, "resistance-temp-table", &len);
796 goto out_ret_pointer;
798 info->resist_table_size = len / (2 * sizeof(__be32));
799 resist_table = info->resist_table = devm_kcalloc(&psy->dev,
800 info->resist_table_size,
801 sizeof(*resist_table),
803 if (!info->resist_table) {
804 power_supply_put_battery_info(psy, info);
809 for (index = 0; index < info->resist_table_size; index++) {
810 resist_table[index].temp = be32_to_cpu(*list++);
811 resist_table[index].resistance = be32_to_cpu(*list++);
815 /* Finally return the whole thing */
819 fwnode_handle_put(fwnode);
820 of_node_put(battery_np);
823 EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
825 void power_supply_put_battery_info(struct power_supply *psy,
826 struct power_supply_battery_info *info)
830 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
831 if (info->ocv_table[i])
832 devm_kfree(&psy->dev, info->ocv_table[i]);
835 if (info->resist_table)
836 devm_kfree(&psy->dev, info->resist_table);
838 devm_kfree(&psy->dev, info);
840 EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
842 const enum power_supply_property power_supply_battery_info_properties[] = {
843 POWER_SUPPLY_PROP_TECHNOLOGY,
844 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
845 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
846 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
847 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
848 POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
849 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
850 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
851 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
852 POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
853 POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
854 POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
855 POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
856 POWER_SUPPLY_PROP_TEMP_MIN,
857 POWER_SUPPLY_PROP_TEMP_MAX,
859 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties);
861 const size_t power_supply_battery_info_properties_size = ARRAY_SIZE(power_supply_battery_info_properties);
862 EXPORT_SYMBOL_GPL(power_supply_battery_info_properties_size);
864 bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
865 enum power_supply_property psp)
871 case POWER_SUPPLY_PROP_TECHNOLOGY:
872 return info->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
873 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
874 return info->energy_full_design_uwh >= 0;
875 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
876 return info->charge_full_design_uah >= 0;
877 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
878 return info->voltage_min_design_uv >= 0;
879 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
880 return info->voltage_max_design_uv >= 0;
881 case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
882 return info->precharge_current_ua >= 0;
883 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
884 return info->charge_term_current_ua >= 0;
885 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
886 return info->constant_charge_current_max_ua >= 0;
887 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
888 return info->constant_charge_voltage_max_uv >= 0;
889 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
890 return info->temp_ambient_alert_min > INT_MIN;
891 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
892 return info->temp_ambient_alert_max < INT_MAX;
893 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
894 return info->temp_alert_min > INT_MIN;
895 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
896 return info->temp_alert_max < INT_MAX;
897 case POWER_SUPPLY_PROP_TEMP_MIN:
898 return info->temp_min > INT_MIN;
899 case POWER_SUPPLY_PROP_TEMP_MAX:
900 return info->temp_max < INT_MAX;
905 EXPORT_SYMBOL_GPL(power_supply_battery_info_has_prop);
907 int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
908 enum power_supply_property psp,
909 union power_supply_propval *val)
914 if (!power_supply_battery_info_has_prop(info, psp))
918 case POWER_SUPPLY_PROP_TECHNOLOGY:
919 val->intval = info->technology;
921 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
922 val->intval = info->energy_full_design_uwh;
924 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
925 val->intval = info->charge_full_design_uah;
927 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
928 val->intval = info->voltage_min_design_uv;
930 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
931 val->intval = info->voltage_max_design_uv;
933 case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
934 val->intval = info->precharge_current_ua;
936 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
937 val->intval = info->charge_term_current_ua;
939 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
940 val->intval = info->constant_charge_current_max_ua;
942 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
943 val->intval = info->constant_charge_voltage_max_uv;
945 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
946 val->intval = info->temp_ambient_alert_min;
948 case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
949 val->intval = info->temp_ambient_alert_max;
951 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
952 val->intval = info->temp_alert_min;
954 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
955 val->intval = info->temp_alert_max;
957 case POWER_SUPPLY_PROP_TEMP_MIN:
958 val->intval = info->temp_min;
960 case POWER_SUPPLY_PROP_TEMP_MAX:
961 val->intval = info->temp_max;
967 EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);
970 * power_supply_temp2resist_simple() - find the battery internal resistance
971 * percent from temperature
972 * @table: Pointer to battery resistance temperature table
973 * @table_len: The table length
974 * @temp: Current temperature
976 * This helper function is used to look up battery internal resistance percent
977 * according to current temperature value from the resistance temperature table,
978 * and the table must be ordered descending. Then the actual battery internal
979 * resistance = the ideal battery internal resistance * percent / 100.
981 * Return: the battery internal resistance percent
983 int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
984 int table_len, int temp)
988 for (i = 0; i < table_len; i++)
989 if (temp > table[i].temp)
992 /* The library function will deal with high == low */
995 else if (i == table_len)
998 high = (low = i) - 1;
1000 return fixp_linear_interpolate(table[low].temp,
1001 table[low].resistance,
1003 table[high].resistance,
1006 EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
1009 * power_supply_vbat2ri() - find the battery internal resistance
1010 * from the battery voltage
1011 * @info: The battery information container
1012 * @vbat_uv: The battery voltage in microvolt
1013 * @charging: If we are charging (true) or not (false)
1015 * This helper function is used to look up battery internal resistance
1016 * according to current battery voltage. Depending on whether the battery
1017 * is currently charging or not, different resistance will be returned.
1019 * Returns the internal resistance in microohm or negative error code.
1021 int power_supply_vbat2ri(struct power_supply_battery_info *info,
1022 int vbat_uv, bool charging)
1024 struct power_supply_vbat_ri_table *vbat2ri;
1029 * If we are charging, and the battery supplies a separate table
1030 * for this state, we use that in order to compensate for the
1031 * charging voltage. Otherwise we use the main table.
1033 if (charging && info->vbat2ri_charging) {
1034 vbat2ri = info->vbat2ri_charging;
1035 table_len = info->vbat2ri_charging_size;
1037 vbat2ri = info->vbat2ri_discharging;
1038 table_len = info->vbat2ri_discharging_size;
1042 * If no tables are specified, or if we are above the highest voltage in
1043 * the voltage table, just return the factory specified internal resistance.
1045 if (!vbat2ri || (table_len <= 0) || (vbat_uv > vbat2ri[0].vbat_uv)) {
1046 if (charging && (info->factory_internal_resistance_charging_uohm > 0))
1047 return info->factory_internal_resistance_charging_uohm;
1049 return info->factory_internal_resistance_uohm;
1052 /* Break loop at table_len - 1 because that is the highest index */
1053 for (i = 0; i < table_len - 1; i++)
1054 if (vbat_uv > vbat2ri[i].vbat_uv)
1057 /* The library function will deal with high == low */
1058 if ((i == 0) || (i == (table_len - 1)))
1064 return fixp_linear_interpolate(vbat2ri[low].vbat_uv,
1065 vbat2ri[low].ri_uohm,
1066 vbat2ri[high].vbat_uv,
1067 vbat2ri[high].ri_uohm,
1070 EXPORT_SYMBOL_GPL(power_supply_vbat2ri);
1072 struct power_supply_maintenance_charge_table *
1073 power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info,
1076 if (index >= info->maintenance_charge_size)
1078 return &info->maintenance_charge[index];
1080 EXPORT_SYMBOL_GPL(power_supply_get_maintenance_charging_setting);
1083 * power_supply_ocv2cap_simple() - find the battery capacity
1084 * @table: Pointer to battery OCV lookup table
1085 * @table_len: OCV table length
1086 * @ocv: Current OCV value
1088 * This helper function is used to look up battery capacity according to
1089 * current OCV value from one OCV table, and the OCV table must be ordered
1092 * Return: the battery capacity.
1094 int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
1095 int table_len, int ocv)
1099 for (i = 0; i < table_len; i++)
1100 if (ocv > table[i].ocv)
1103 /* The library function will deal with high == low */
1106 else if (i == table_len)
1109 high = (low = i) - 1;
1111 return fixp_linear_interpolate(table[low].ocv,
1112 table[low].capacity,
1114 table[high].capacity,
1117 EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
1119 struct power_supply_battery_ocv_table *
1120 power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
1121 int temp, int *table_len)
1123 int best_temp_diff = INT_MAX, temp_diff;
1124 u8 i, best_index = 0;
1126 if (!info->ocv_table[0])
1129 for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
1130 /* Out of capacity tables */
1131 if (!info->ocv_table[i])
1134 temp_diff = abs(info->ocv_temp[i] - temp);
1136 if (temp_diff < best_temp_diff) {
1137 best_temp_diff = temp_diff;
1142 *table_len = info->ocv_table_size[best_index];
1143 return info->ocv_table[best_index];
1145 EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
1147 int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
1150 struct power_supply_battery_ocv_table *table;
1153 table = power_supply_find_ocv2cap_table(info, temp, &table_len);
1157 return power_supply_ocv2cap_simple(table, table_len, ocv);
1159 EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
1161 bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
1166 /* Nothing like this can be checked */
1167 if (info->bti_resistance_ohm <= 0)
1170 /* This will be extremely strict and unlikely to work */
1171 if (info->bti_resistance_tolerance <= 0)
1172 return (info->bti_resistance_ohm == resistance);
1174 low = info->bti_resistance_ohm -
1175 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1176 high = info->bti_resistance_ohm +
1177 (info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
1179 return ((resistance >= low) && (resistance <= high));
1181 EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
1183 static bool psy_has_property(const struct power_supply_desc *psy_desc,
1184 enum power_supply_property psp)
1189 for (i = 0; i < psy_desc->num_properties; i++) {
1190 if (psy_desc->properties[i] == psp) {
1199 int power_supply_get_property(struct power_supply *psy,
1200 enum power_supply_property psp,
1201 union power_supply_propval *val)
1203 if (atomic_read(&psy->use_cnt) <= 0) {
1204 if (!psy->initialized)
1209 if (psy_has_property(psy->desc, psp))
1210 return psy->desc->get_property(psy, psp, val);
1211 else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
1212 return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
1216 EXPORT_SYMBOL_GPL(power_supply_get_property);
1218 int power_supply_set_property(struct power_supply *psy,
1219 enum power_supply_property psp,
1220 const union power_supply_propval *val)
1222 if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
1225 return psy->desc->set_property(psy, psp, val);
1227 EXPORT_SYMBOL_GPL(power_supply_set_property);
1229 int power_supply_property_is_writeable(struct power_supply *psy,
1230 enum power_supply_property psp)
1232 if (atomic_read(&psy->use_cnt) <= 0 ||
1233 !psy->desc->property_is_writeable)
1236 return psy->desc->property_is_writeable(psy, psp);
1238 EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
1240 void power_supply_external_power_changed(struct power_supply *psy)
1242 if (atomic_read(&psy->use_cnt) <= 0 ||
1243 !psy->desc->external_power_changed)
1246 psy->desc->external_power_changed(psy);
1248 EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
1250 int power_supply_powers(struct power_supply *psy, struct device *dev)
1252 return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
1254 EXPORT_SYMBOL_GPL(power_supply_powers);
1256 static void power_supply_dev_release(struct device *dev)
1258 struct power_supply *psy = to_power_supply(dev);
1259 dev_dbg(dev, "%s\n", __func__);
1263 int power_supply_reg_notifier(struct notifier_block *nb)
1265 return atomic_notifier_chain_register(&power_supply_notifier, nb);
1267 EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
1269 void power_supply_unreg_notifier(struct notifier_block *nb)
1271 atomic_notifier_chain_unregister(&power_supply_notifier, nb);
1273 EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
1275 #ifdef CONFIG_THERMAL
1276 static int power_supply_read_temp(struct thermal_zone_device *tzd,
1279 struct power_supply *psy;
1280 union power_supply_propval val;
1283 WARN_ON(tzd == NULL);
1284 psy = thermal_zone_device_priv(tzd);
1285 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
1289 /* Convert tenths of degree Celsius to milli degree Celsius. */
1290 *temp = val.intval * 100;
1295 static struct thermal_zone_device_ops psy_tzd_ops = {
1296 .get_temp = power_supply_read_temp,
1299 static int psy_register_thermal(struct power_supply *psy)
1303 if (psy->desc->no_thermal)
1306 /* Register battery zone device psy reports temperature */
1307 if (psy_has_property(psy->desc, POWER_SUPPLY_PROP_TEMP)) {
1308 /* Prefer our hwmon device and avoid duplicates */
1309 struct thermal_zone_params tzp = {
1310 .no_hwmon = IS_ENABLED(CONFIG_POWER_SUPPLY_HWMON)
1312 psy->tzd = thermal_zone_device_register(psy->desc->name,
1313 0, 0, psy, &psy_tzd_ops, &tzp, 0, 0);
1314 if (IS_ERR(psy->tzd))
1315 return PTR_ERR(psy->tzd);
1316 ret = thermal_zone_device_enable(psy->tzd);
1318 thermal_zone_device_unregister(psy->tzd);
1325 static void psy_unregister_thermal(struct power_supply *psy)
1327 if (IS_ERR_OR_NULL(psy->tzd))
1329 thermal_zone_device_unregister(psy->tzd);
1333 static int psy_register_thermal(struct power_supply *psy)
1338 static void psy_unregister_thermal(struct power_supply *psy)
1343 static struct power_supply *__must_check
1344 __power_supply_register(struct device *parent,
1345 const struct power_supply_desc *desc,
1346 const struct power_supply_config *cfg,
1350 struct power_supply *psy;
1353 if (!desc || !desc->name || !desc->properties || !desc->num_properties)
1354 return ERR_PTR(-EINVAL);
1357 pr_warn("%s: Expected proper parent device for '%s'\n",
1358 __func__, desc->name);
1360 if (psy_has_property(desc, POWER_SUPPLY_PROP_USB_TYPE) &&
1361 (!desc->usb_types || !desc->num_usb_types))
1362 return ERR_PTR(-EINVAL);
1364 psy = kzalloc(sizeof(*psy), GFP_KERNEL);
1366 return ERR_PTR(-ENOMEM);
1370 device_initialize(dev);
1372 dev->class = power_supply_class;
1373 dev->type = &power_supply_dev_type;
1374 dev->parent = parent;
1375 dev->release = power_supply_dev_release;
1376 dev_set_drvdata(dev, psy);
1379 dev->groups = cfg->attr_grp;
1380 psy->drv_data = cfg->drv_data;
1382 cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
1383 psy->supplied_to = cfg->supplied_to;
1384 psy->num_supplicants = cfg->num_supplicants;
1387 rc = dev_set_name(dev, "%s", desc->name);
1389 goto dev_set_name_failed;
1391 INIT_WORK(&psy->changed_work, power_supply_changed_work);
1392 INIT_DELAYED_WORK(&psy->deferred_register_work,
1393 power_supply_deferred_register_work);
1395 rc = power_supply_check_supplies(psy);
1397 dev_dbg(dev, "Not all required supplies found, defer probe\n");
1398 goto check_supplies_failed;
1402 * Expose constant battery info, if it is available. While there are
1403 * some chargers accessing constant battery data, we only want to
1404 * expose battery data to userspace for battery devices.
1406 if (desc->type == POWER_SUPPLY_TYPE_BATTERY) {
1407 rc = power_supply_get_battery_info(psy, &psy->battery_info);
1408 if (rc && rc != -ENODEV && rc != -ENOENT)
1409 goto check_supplies_failed;
1412 spin_lock_init(&psy->changed_lock);
1413 rc = device_add(dev);
1415 goto device_add_failed;
1417 rc = device_init_wakeup(dev, ws);
1419 goto wakeup_init_failed;
1421 rc = psy_register_thermal(psy);
1423 goto register_thermal_failed;
1425 rc = power_supply_create_triggers(psy);
1427 goto create_triggers_failed;
1429 rc = power_supply_add_hwmon_sysfs(psy);
1431 goto add_hwmon_sysfs_failed;
1434 * Update use_cnt after any uevents (most notably from device_add()).
1435 * We are here still during driver's probe but
1436 * the power_supply_uevent() calls back driver's get_property
1438 * 1. Driver did not assigned the returned struct power_supply,
1439 * 2. Driver could not finish initialization (anything in its probe
1440 * after calling power_supply_register()).
1442 atomic_inc(&psy->use_cnt);
1443 psy->initialized = true;
1445 queue_delayed_work(system_power_efficient_wq,
1446 &psy->deferred_register_work,
1447 POWER_SUPPLY_DEFERRED_REGISTER_TIME);
1451 add_hwmon_sysfs_failed:
1452 power_supply_remove_triggers(psy);
1453 create_triggers_failed:
1454 psy_unregister_thermal(psy);
1455 register_thermal_failed:
1459 check_supplies_failed:
1460 dev_set_name_failed:
1466 * power_supply_register() - Register new power supply
1467 * @parent: Device to be a parent of power supply's device, usually
1468 * the device which probe function calls this
1469 * @desc: Description of power supply, must be valid through whole
1470 * lifetime of this power supply
1471 * @cfg: Run-time specific configuration accessed during registering,
1474 * Return: A pointer to newly allocated power_supply on success
1475 * or ERR_PTR otherwise.
1476 * Use power_supply_unregister() on returned power_supply pointer to release
1479 struct power_supply *__must_check power_supply_register(struct device *parent,
1480 const struct power_supply_desc *desc,
1481 const struct power_supply_config *cfg)
1483 return __power_supply_register(parent, desc, cfg, true);
1485 EXPORT_SYMBOL_GPL(power_supply_register);
1488 * power_supply_register_no_ws() - Register new non-waking-source power supply
1489 * @parent: Device to be a parent of power supply's device, usually
1490 * the device which probe function calls this
1491 * @desc: Description of power supply, must be valid through whole
1492 * lifetime of this power supply
1493 * @cfg: Run-time specific configuration accessed during registering,
1496 * Return: A pointer to newly allocated power_supply on success
1497 * or ERR_PTR otherwise.
1498 * Use power_supply_unregister() on returned power_supply pointer to release
1501 struct power_supply *__must_check
1502 power_supply_register_no_ws(struct device *parent,
1503 const struct power_supply_desc *desc,
1504 const struct power_supply_config *cfg)
1506 return __power_supply_register(parent, desc, cfg, false);
1508 EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
1510 static void devm_power_supply_release(struct device *dev, void *res)
1512 struct power_supply **psy = res;
1514 power_supply_unregister(*psy);
1518 * devm_power_supply_register() - Register managed power supply
1519 * @parent: Device to be a parent of power supply's device, usually
1520 * the device which probe function calls this
1521 * @desc: Description of power supply, must be valid through whole
1522 * lifetime of this power supply
1523 * @cfg: Run-time specific configuration accessed during registering,
1526 * Return: A pointer to newly allocated power_supply on success
1527 * or ERR_PTR otherwise.
1528 * The returned power_supply pointer will be automatically unregistered
1531 struct power_supply *__must_check
1532 devm_power_supply_register(struct device *parent,
1533 const struct power_supply_desc *desc,
1534 const struct power_supply_config *cfg)
1536 struct power_supply **ptr, *psy;
1538 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1541 return ERR_PTR(-ENOMEM);
1542 psy = __power_supply_register(parent, desc, cfg, true);
1547 devres_add(parent, ptr);
1551 EXPORT_SYMBOL_GPL(devm_power_supply_register);
1554 * devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
1555 * @parent: Device to be a parent of power supply's device, usually
1556 * the device which probe function calls this
1557 * @desc: Description of power supply, must be valid through whole
1558 * lifetime of this power supply
1559 * @cfg: Run-time specific configuration accessed during registering,
1562 * Return: A pointer to newly allocated power_supply on success
1563 * or ERR_PTR otherwise.
1564 * The returned power_supply pointer will be automatically unregistered
1567 struct power_supply *__must_check
1568 devm_power_supply_register_no_ws(struct device *parent,
1569 const struct power_supply_desc *desc,
1570 const struct power_supply_config *cfg)
1572 struct power_supply **ptr, *psy;
1574 ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
1577 return ERR_PTR(-ENOMEM);
1578 psy = __power_supply_register(parent, desc, cfg, false);
1583 devres_add(parent, ptr);
1587 EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
1590 * power_supply_unregister() - Remove this power supply from system
1591 * @psy: Pointer to power supply to unregister
1593 * Remove this power supply from the system. The resources of power supply
1594 * will be freed here or on last power_supply_put() call.
1596 void power_supply_unregister(struct power_supply *psy)
1598 WARN_ON(atomic_dec_return(&psy->use_cnt));
1599 psy->removing = true;
1600 cancel_work_sync(&psy->changed_work);
1601 cancel_delayed_work_sync(&psy->deferred_register_work);
1602 sysfs_remove_link(&psy->dev.kobj, "powers");
1603 power_supply_remove_hwmon_sysfs(psy);
1604 power_supply_remove_triggers(psy);
1605 psy_unregister_thermal(psy);
1606 device_init_wakeup(&psy->dev, false);
1607 device_unregister(&psy->dev);
1609 EXPORT_SYMBOL_GPL(power_supply_unregister);
1611 void *power_supply_get_drvdata(struct power_supply *psy)
1613 return psy->drv_data;
1615 EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
1617 static int __init power_supply_class_init(void)
1619 power_supply_class = class_create("power_supply");
1621 if (IS_ERR(power_supply_class))
1622 return PTR_ERR(power_supply_class);
1624 power_supply_class->dev_uevent = power_supply_uevent;
1625 power_supply_init_attrs(&power_supply_dev_type);
1630 static void __exit power_supply_class_exit(void)
1632 class_destroy(power_supply_class);
1635 subsys_initcall(power_supply_class_init);
1636 module_exit(power_supply_class_exit);
1638 MODULE_DESCRIPTION("Universal power supply monitor class");
1639 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
1641 "Anton Vorontsov <cbou@mail.ru>");