1388 lines
37 KiB
C
1388 lines
37 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Universal power supply monitor class
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*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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* Copyright © 2004 Szabolcs Gyurko
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* Copyright © 2003 Ian Molton <spyro@f2s.com>
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*
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* Modified: 2004, Oct Szabolcs Gyurko
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/notifier.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/power_supply.h>
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#include <linux/property.h>
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#include <linux/thermal.h>
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#include "power_supply.h"
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/* exported for the APM Power driver, APM emulation */
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struct class *power_supply_class;
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EXPORT_SYMBOL_GPL(power_supply_class);
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ATOMIC_NOTIFIER_HEAD(power_supply_notifier);
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EXPORT_SYMBOL_GPL(power_supply_notifier);
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static struct device_type power_supply_dev_type;
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#define POWER_SUPPLY_DEFERRED_REGISTER_TIME msecs_to_jiffies(10)
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static bool __power_supply_is_supplied_by(struct power_supply *supplier,
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struct power_supply *supply)
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{
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int i;
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if (!supply->supplied_from && !supplier->supplied_to)
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return false;
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/* Support both supplied_to and supplied_from modes */
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if (supply->supplied_from) {
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if (!supplier->desc->name)
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return false;
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for (i = 0; i < supply->num_supplies; i++)
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if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
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return true;
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} else {
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if (!supply->desc->name)
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return false;
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for (i = 0; i < supplier->num_supplicants; i++)
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if (!strcmp(supplier->supplied_to[i], supply->desc->name))
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return true;
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}
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return false;
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}
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static int __power_supply_changed_work(struct device *dev, void *data)
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{
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struct power_supply *psy = data;
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struct power_supply *pst = dev_get_drvdata(dev);
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if (__power_supply_is_supplied_by(psy, pst)) {
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if (pst->desc->external_power_changed)
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pst->desc->external_power_changed(pst);
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}
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return 0;
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}
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static void power_supply_changed_work(struct work_struct *work)
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{
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unsigned long flags;
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struct power_supply *psy = container_of(work, struct power_supply,
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changed_work);
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dev_dbg(&psy->dev, "%s\n", __func__);
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spin_lock_irqsave(&psy->changed_lock, flags);
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/*
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* Check 'changed' here to avoid issues due to race between
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* power_supply_changed() and this routine. In worst case
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* power_supply_changed() can be called again just before we take above
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* lock. During the first call of this routine we will mark 'changed' as
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* false and it will stay false for the next call as well.
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*/
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if (likely(psy->changed)) {
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psy->changed = false;
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spin_unlock_irqrestore(&psy->changed_lock, flags);
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class_for_each_device(power_supply_class, NULL, psy,
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__power_supply_changed_work);
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power_supply_update_leds(psy);
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atomic_notifier_call_chain(&power_supply_notifier,
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PSY_EVENT_PROP_CHANGED, psy);
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kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
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spin_lock_irqsave(&psy->changed_lock, flags);
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}
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/*
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* Hold the wakeup_source until all events are processed.
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* power_supply_changed() might have called again and have set 'changed'
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* to true.
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*/
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if (likely(!psy->changed))
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pm_relax(&psy->dev);
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spin_unlock_irqrestore(&psy->changed_lock, flags);
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}
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void power_supply_changed(struct power_supply *psy)
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{
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unsigned long flags;
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dev_dbg(&psy->dev, "%s\n", __func__);
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spin_lock_irqsave(&psy->changed_lock, flags);
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psy->changed = true;
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pm_stay_awake(&psy->dev);
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spin_unlock_irqrestore(&psy->changed_lock, flags);
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schedule_work(&psy->changed_work);
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}
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EXPORT_SYMBOL_GPL(power_supply_changed);
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/*
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* Notify that power supply was registered after parent finished the probing.
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*
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* Often power supply is registered from driver's probe function. However
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* calling power_supply_changed() directly from power_supply_register()
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* would lead to execution of get_property() function provided by the driver
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* too early - before the probe ends.
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*
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* Avoid that by waiting on parent's mutex.
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*/
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static void power_supply_deferred_register_work(struct work_struct *work)
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{
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struct power_supply *psy = container_of(work, struct power_supply,
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deferred_register_work.work);
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if (psy->dev.parent) {
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while (!mutex_trylock(&psy->dev.parent->mutex)) {
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if (psy->removing)
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return;
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msleep(10);
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}
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}
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power_supply_changed(psy);
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if (psy->dev.parent)
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mutex_unlock(&psy->dev.parent->mutex);
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}
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#ifdef CONFIG_OF
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static int __power_supply_populate_supplied_from(struct device *dev,
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void *data)
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{
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struct power_supply *psy = data;
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struct power_supply *epsy = dev_get_drvdata(dev);
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struct device_node *np;
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int i = 0;
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do {
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np = of_parse_phandle(psy->of_node, "power-supplies", i++);
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if (!np)
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break;
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if (np == epsy->of_node) {
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dev_dbg(&psy->dev, "%s: Found supply : %s\n",
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psy->desc->name, epsy->desc->name);
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psy->supplied_from[i-1] = (char *)epsy->desc->name;
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psy->num_supplies++;
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of_node_put(np);
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break;
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}
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of_node_put(np);
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} while (np);
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return 0;
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}
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static int power_supply_populate_supplied_from(struct power_supply *psy)
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{
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int error;
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error = class_for_each_device(power_supply_class, NULL, psy,
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__power_supply_populate_supplied_from);
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dev_dbg(&psy->dev, "%s %d\n", __func__, error);
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return error;
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}
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static int __power_supply_find_supply_from_node(struct device *dev,
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void *data)
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{
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struct device_node *np = data;
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struct power_supply *epsy = dev_get_drvdata(dev);
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/* returning non-zero breaks out of class_for_each_device loop */
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if (epsy->of_node == np)
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return 1;
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return 0;
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}
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static int power_supply_find_supply_from_node(struct device_node *supply_node)
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{
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int error;
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/*
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* class_for_each_device() either returns its own errors or values
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* returned by __power_supply_find_supply_from_node().
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*
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* __power_supply_find_supply_from_node() will return 0 (no match)
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* or 1 (match).
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*
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* We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
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* it returned 0, or error as returned by it.
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*/
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error = class_for_each_device(power_supply_class, NULL, supply_node,
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__power_supply_find_supply_from_node);
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return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
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}
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static int power_supply_check_supplies(struct power_supply *psy)
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{
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struct device_node *np;
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int cnt = 0;
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/* If there is already a list honor it */
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if (psy->supplied_from && psy->num_supplies > 0)
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return 0;
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/* No device node found, nothing to do */
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if (!psy->of_node)
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return 0;
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do {
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int ret;
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np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
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if (!np)
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break;
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ret = power_supply_find_supply_from_node(np);
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of_node_put(np);
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if (ret) {
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dev_dbg(&psy->dev, "Failed to find supply!\n");
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return ret;
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}
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} while (np);
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/* Missing valid "power-supplies" entries */
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if (cnt == 1)
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return 0;
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/* All supplies found, allocate char ** array for filling */
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psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(psy->supplied_from),
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GFP_KERNEL);
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if (!psy->supplied_from)
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return -ENOMEM;
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*psy->supplied_from = devm_kcalloc(&psy->dev,
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cnt - 1, sizeof(char *),
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GFP_KERNEL);
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if (!*psy->supplied_from)
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return -ENOMEM;
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return power_supply_populate_supplied_from(psy);
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}
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#else
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static int power_supply_check_supplies(struct power_supply *psy)
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{
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int nval, ret;
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if (!psy->dev.parent)
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return 0;
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nval = device_property_read_string_array(psy->dev.parent,
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"supplied-from", NULL, 0);
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if (nval <= 0)
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return 0;
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psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
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sizeof(char *), GFP_KERNEL);
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if (!psy->supplied_from)
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return -ENOMEM;
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ret = device_property_read_string_array(psy->dev.parent,
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"supplied-from", (const char **)psy->supplied_from, nval);
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if (ret < 0)
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return ret;
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psy->num_supplies = nval;
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return 0;
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}
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#endif
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struct psy_am_i_supplied_data {
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struct power_supply *psy;
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unsigned int count;
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};
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static int __power_supply_am_i_supplied(struct device *dev, void *_data)
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{
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union power_supply_propval ret = {0,};
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struct power_supply *epsy = dev_get_drvdata(dev);
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struct psy_am_i_supplied_data *data = _data;
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if (__power_supply_is_supplied_by(epsy, data->psy)) {
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data->count++;
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if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
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&ret))
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return ret.intval;
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}
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return 0;
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}
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int power_supply_am_i_supplied(struct power_supply *psy)
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{
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struct psy_am_i_supplied_data data = { psy, 0 };
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int error;
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error = class_for_each_device(power_supply_class, NULL, &data,
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__power_supply_am_i_supplied);
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dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
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if (data.count == 0)
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return -ENODEV;
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return error;
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}
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EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
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static int __power_supply_is_system_supplied(struct device *dev, void *data)
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{
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union power_supply_propval ret = {0,};
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struct power_supply *psy = dev_get_drvdata(dev);
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unsigned int *count = data;
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(*count)++;
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if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
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if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
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&ret))
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return ret.intval;
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return 0;
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}
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int power_supply_is_system_supplied(void)
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{
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int error;
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unsigned int count = 0;
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error = class_for_each_device(power_supply_class, NULL, &count,
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__power_supply_is_system_supplied);
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/*
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* If no power class device was found at all, most probably we are
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* running on a desktop system, so assume we are on mains power.
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*/
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if (count == 0)
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return 1;
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return error;
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}
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EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
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static int __power_supply_get_supplier_max_current(struct device *dev,
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void *data)
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{
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union power_supply_propval ret = {0,};
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struct power_supply *epsy = dev_get_drvdata(dev);
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struct power_supply *psy = data;
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if (__power_supply_is_supplied_by(epsy, psy))
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if (!epsy->desc->get_property(epsy,
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POWER_SUPPLY_PROP_CURRENT_MAX,
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&ret))
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return ret.intval;
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return 0;
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}
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int power_supply_set_input_current_limit_from_supplier(struct power_supply *psy)
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{
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union power_supply_propval val = {0,};
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int curr;
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if (!psy->desc->set_property)
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return -EINVAL;
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/*
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* This function is not intended for use with a supply with multiple
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* suppliers, we simply pick the first supply to report a non 0
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* max-current.
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*/
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curr = class_for_each_device(power_supply_class, NULL, psy,
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__power_supply_get_supplier_max_current);
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if (curr <= 0)
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return (curr == 0) ? -ENODEV : curr;
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val.intval = curr;
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return psy->desc->set_property(psy,
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POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
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}
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EXPORT_SYMBOL_GPL(power_supply_set_input_current_limit_from_supplier);
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int power_supply_set_battery_charged(struct power_supply *psy)
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{
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if (atomic_read(&psy->use_cnt) >= 0 &&
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psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
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psy->desc->set_charged) {
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psy->desc->set_charged(psy);
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return 0;
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
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static int power_supply_match_device_by_name(struct device *dev, const void *data)
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{
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const char *name = data;
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struct power_supply *psy = dev_get_drvdata(dev);
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return strcmp(psy->desc->name, name) == 0;
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}
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/**
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* power_supply_get_by_name() - Search for a power supply and returns its ref
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* @name: Power supply name to fetch
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*
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* If power supply was found, it increases reference count for the
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* internal power supply's device. The user should power_supply_put()
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* after usage.
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*
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* Return: On success returns a reference to a power supply with
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* matching name equals to @name, a NULL otherwise.
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*/
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struct power_supply *power_supply_get_by_name(const char *name)
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{
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struct power_supply *psy = NULL;
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struct device *dev = class_find_device(power_supply_class, NULL, name,
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power_supply_match_device_by_name);
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if (dev) {
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psy = dev_get_drvdata(dev);
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atomic_inc(&psy->use_cnt);
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}
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return psy;
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}
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EXPORT_SYMBOL_GPL(power_supply_get_by_name);
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/**
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* power_supply_put() - Drop reference obtained with power_supply_get_by_name
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* @psy: Reference to put
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*
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* The reference to power supply should be put before unregistering
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* the power supply.
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*/
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void power_supply_put(struct power_supply *psy)
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{
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might_sleep();
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atomic_dec(&psy->use_cnt);
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put_device(&psy->dev);
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}
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EXPORT_SYMBOL_GPL(power_supply_put);
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#ifdef CONFIG_OF
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static int power_supply_match_device_node(struct device *dev, const void *data)
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{
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return dev->parent && dev->parent->of_node == data;
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}
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/**
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* power_supply_get_by_phandle() - Search for a power supply and returns its ref
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* @np: Pointer to device node holding phandle property
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* @property: Name of property holding a power supply name
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*
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* If power supply was found, it increases reference count for the
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* internal power supply's device. The user should power_supply_put()
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* after usage.
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*
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* Return: On success returns a reference to a power supply with
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* matching name equals to value under @property, NULL or ERR_PTR otherwise.
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*/
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struct power_supply *power_supply_get_by_phandle(struct device_node *np,
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const char *property)
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{
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struct device_node *power_supply_np;
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struct power_supply *psy = NULL;
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struct device *dev;
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power_supply_np = of_parse_phandle(np, property, 0);
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if (!power_supply_np)
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return ERR_PTR(-ENODEV);
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dev = class_find_device(power_supply_class, NULL, power_supply_np,
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power_supply_match_device_node);
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of_node_put(power_supply_np);
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if (dev) {
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psy = dev_get_drvdata(dev);
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atomic_inc(&psy->use_cnt);
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}
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return psy;
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}
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EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
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static void devm_power_supply_put(struct device *dev, void *res)
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{
|
|
struct power_supply **psy = res;
|
|
|
|
power_supply_put(*psy);
|
|
}
|
|
|
|
/**
|
|
* devm_power_supply_get_by_phandle() - Resource managed version of
|
|
* power_supply_get_by_phandle()
|
|
* @dev: Pointer to device holding phandle property
|
|
* @property: Name of property holding a power supply phandle
|
|
*
|
|
* Return: On success returns a reference to a power supply with
|
|
* matching name equals to value under @property, NULL or ERR_PTR otherwise.
|
|
*/
|
|
struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
|
|
const char *property)
|
|
{
|
|
struct power_supply **ptr, *psy;
|
|
|
|
if (!dev->of_node)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
psy = power_supply_get_by_phandle(dev->of_node, property);
|
|
if (IS_ERR_OR_NULL(psy)) {
|
|
devres_free(ptr);
|
|
} else {
|
|
*ptr = psy;
|
|
devres_add(dev, ptr);
|
|
}
|
|
return psy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
|
|
#endif /* CONFIG_OF */
|
|
|
|
int power_supply_get_battery_info(struct power_supply *psy,
|
|
struct power_supply_battery_info *info)
|
|
{
|
|
struct power_supply_resistance_temp_table *resist_table;
|
|
struct device_node *battery_np;
|
|
const char *value;
|
|
int err, len, index;
|
|
const __be32 *list;
|
|
|
|
info->energy_full_design_uwh = -EINVAL;
|
|
info->charge_full_design_uah = -EINVAL;
|
|
info->voltage_min_design_uv = -EINVAL;
|
|
info->voltage_max_design_uv = -EINVAL;
|
|
info->precharge_current_ua = -EINVAL;
|
|
info->charge_term_current_ua = -EINVAL;
|
|
info->constant_charge_current_max_ua = -EINVAL;
|
|
info->constant_charge_voltage_max_uv = -EINVAL;
|
|
info->temp_ambient_alert_min = INT_MIN;
|
|
info->temp_ambient_alert_max = INT_MAX;
|
|
info->temp_alert_min = INT_MIN;
|
|
info->temp_alert_max = INT_MAX;
|
|
info->temp_min = INT_MIN;
|
|
info->temp_max = INT_MAX;
|
|
info->factory_internal_resistance_uohm = -EINVAL;
|
|
info->resist_table = NULL;
|
|
|
|
for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) {
|
|
info->ocv_table[index] = NULL;
|
|
info->ocv_temp[index] = -EINVAL;
|
|
info->ocv_table_size[index] = -EINVAL;
|
|
}
|
|
|
|
if (!psy->of_node) {
|
|
dev_warn(&psy->dev, "%s currently only supports devicetree\n",
|
|
__func__);
|
|
return -ENXIO;
|
|
}
|
|
|
|
battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
|
|
if (!battery_np)
|
|
return -ENODEV;
|
|
|
|
err = of_property_read_string(battery_np, "compatible", &value);
|
|
if (err)
|
|
goto out_put_node;
|
|
|
|
if (strcmp("simple-battery", value)) {
|
|
err = -ENODEV;
|
|
goto out_put_node;
|
|
}
|
|
|
|
/* The property and field names below must correspond to elements
|
|
* in enum power_supply_property. For reasoning, see
|
|
* Documentation/power/power_supply_class.rst.
|
|
*/
|
|
|
|
of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
|
|
&info->energy_full_design_uwh);
|
|
of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
|
|
&info->charge_full_design_uah);
|
|
of_property_read_u32(battery_np, "voltage-min-design-microvolt",
|
|
&info->voltage_min_design_uv);
|
|
of_property_read_u32(battery_np, "voltage-max-design-microvolt",
|
|
&info->voltage_max_design_uv);
|
|
of_property_read_u32(battery_np, "trickle-charge-current-microamp",
|
|
&info->tricklecharge_current_ua);
|
|
of_property_read_u32(battery_np, "precharge-current-microamp",
|
|
&info->precharge_current_ua);
|
|
of_property_read_u32(battery_np, "precharge-upper-limit-microvolt",
|
|
&info->precharge_voltage_max_uv);
|
|
of_property_read_u32(battery_np, "charge-term-current-microamp",
|
|
&info->charge_term_current_ua);
|
|
of_property_read_u32(battery_np, "re-charge-voltage-microvolt",
|
|
&info->charge_restart_voltage_uv);
|
|
of_property_read_u32(battery_np, "over-voltage-threshold-microvolt",
|
|
&info->overvoltage_limit_uv);
|
|
of_property_read_u32(battery_np, "constant-charge-current-max-microamp",
|
|
&info->constant_charge_current_max_ua);
|
|
of_property_read_u32(battery_np, "constant-charge-voltage-max-microvolt",
|
|
&info->constant_charge_voltage_max_uv);
|
|
of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms",
|
|
&info->factory_internal_resistance_uohm);
|
|
|
|
of_property_read_u32_index(battery_np, "ambient-celsius",
|
|
0, &info->temp_ambient_alert_min);
|
|
of_property_read_u32_index(battery_np, "ambient-celsius",
|
|
1, &info->temp_ambient_alert_max);
|
|
of_property_read_u32_index(battery_np, "alert-celsius",
|
|
0, &info->temp_alert_min);
|
|
of_property_read_u32_index(battery_np, "alert-celsius",
|
|
1, &info->temp_alert_max);
|
|
of_property_read_u32_index(battery_np, "operating-range-celsius",
|
|
0, &info->temp_min);
|
|
of_property_read_u32_index(battery_np, "operating-range-celsius",
|
|
1, &info->temp_max);
|
|
|
|
len = of_property_count_u32_elems(battery_np, "ocv-capacity-celsius");
|
|
if (len < 0 && len != -EINVAL) {
|
|
err = len;
|
|
goto out_put_node;
|
|
} else if (len > POWER_SUPPLY_OCV_TEMP_MAX) {
|
|
dev_err(&psy->dev, "Too many temperature values\n");
|
|
err = -EINVAL;
|
|
goto out_put_node;
|
|
} else if (len > 0) {
|
|
of_property_read_u32_array(battery_np, "ocv-capacity-celsius",
|
|
info->ocv_temp, len);
|
|
}
|
|
|
|
for (index = 0; index < len; index++) {
|
|
struct power_supply_battery_ocv_table *table;
|
|
char *propname;
|
|
int i, tab_len, size;
|
|
|
|
propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index);
|
|
list = of_get_property(battery_np, propname, &size);
|
|
if (!list || !size) {
|
|
dev_err(&psy->dev, "failed to get %s\n", propname);
|
|
kfree(propname);
|
|
power_supply_put_battery_info(psy, info);
|
|
err = -EINVAL;
|
|
goto out_put_node;
|
|
}
|
|
|
|
kfree(propname);
|
|
tab_len = size / (2 * sizeof(__be32));
|
|
info->ocv_table_size[index] = tab_len;
|
|
|
|
table = info->ocv_table[index] =
|
|
devm_kcalloc(&psy->dev, tab_len, sizeof(*table), GFP_KERNEL);
|
|
if (!info->ocv_table[index]) {
|
|
power_supply_put_battery_info(psy, info);
|
|
err = -ENOMEM;
|
|
goto out_put_node;
|
|
}
|
|
|
|
for (i = 0; i < tab_len; i++) {
|
|
table[i].ocv = be32_to_cpu(*list);
|
|
list++;
|
|
table[i].capacity = be32_to_cpu(*list);
|
|
list++;
|
|
}
|
|
}
|
|
|
|
list = of_get_property(battery_np, "resistance-temp-table", &len);
|
|
if (!list || !len)
|
|
goto out_put_node;
|
|
|
|
info->resist_table_size = len / (2 * sizeof(__be32));
|
|
resist_table = info->resist_table = devm_kcalloc(&psy->dev,
|
|
info->resist_table_size,
|
|
sizeof(*resist_table),
|
|
GFP_KERNEL);
|
|
if (!info->resist_table) {
|
|
power_supply_put_battery_info(psy, info);
|
|
err = -ENOMEM;
|
|
goto out_put_node;
|
|
}
|
|
|
|
for (index = 0; index < info->resist_table_size; index++) {
|
|
resist_table[index].temp = be32_to_cpu(*list++);
|
|
resist_table[index].resistance = be32_to_cpu(*list++);
|
|
}
|
|
|
|
out_put_node:
|
|
of_node_put(battery_np);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
|
|
|
|
void power_supply_put_battery_info(struct power_supply *psy,
|
|
struct power_supply_battery_info *info)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
|
|
if (info->ocv_table[i])
|
|
devm_kfree(&psy->dev, info->ocv_table[i]);
|
|
}
|
|
|
|
if (info->resist_table)
|
|
devm_kfree(&psy->dev, info->resist_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
|
|
|
|
/**
|
|
* power_supply_temp2resist_simple() - find the battery internal resistance
|
|
* percent
|
|
* @table: Pointer to battery resistance temperature table
|
|
* @table_len: The table length
|
|
* @temp: Current temperature
|
|
*
|
|
* This helper function is used to look up battery internal resistance percent
|
|
* according to current temperature value from the resistance temperature table,
|
|
* and the table must be ordered descending. Then the actual battery internal
|
|
* resistance = the ideal battery internal resistance * percent / 100.
|
|
*
|
|
* Return: the battery internal resistance percent
|
|
*/
|
|
int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
|
|
int table_len, int temp)
|
|
{
|
|
int i, resist;
|
|
|
|
for (i = 0; i < table_len; i++)
|
|
if (temp > table[i].temp)
|
|
break;
|
|
|
|
if (i > 0 && i < table_len) {
|
|
int tmp;
|
|
|
|
tmp = (table[i - 1].resistance - table[i].resistance) *
|
|
(temp - table[i].temp);
|
|
tmp /= table[i - 1].temp - table[i].temp;
|
|
resist = tmp + table[i].resistance;
|
|
} else if (i == 0) {
|
|
resist = table[0].resistance;
|
|
} else {
|
|
resist = table[table_len - 1].resistance;
|
|
}
|
|
|
|
return resist;
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
|
|
|
|
/**
|
|
* power_supply_ocv2cap_simple() - find the battery capacity
|
|
* @table: Pointer to battery OCV lookup table
|
|
* @table_len: OCV table length
|
|
* @ocv: Current OCV value
|
|
*
|
|
* This helper function is used to look up battery capacity according to
|
|
* current OCV value from one OCV table, and the OCV table must be ordered
|
|
* descending.
|
|
*
|
|
* Return: the battery capacity.
|
|
*/
|
|
int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
|
|
int table_len, int ocv)
|
|
{
|
|
int i, cap, tmp;
|
|
|
|
for (i = 0; i < table_len; i++)
|
|
if (ocv > table[i].ocv)
|
|
break;
|
|
|
|
if (i > 0 && i < table_len) {
|
|
tmp = (table[i - 1].capacity - table[i].capacity) *
|
|
(ocv - table[i].ocv);
|
|
tmp /= table[i - 1].ocv - table[i].ocv;
|
|
cap = tmp + table[i].capacity;
|
|
} else if (i == 0) {
|
|
cap = table[0].capacity;
|
|
} else {
|
|
cap = table[table_len - 1].capacity;
|
|
}
|
|
|
|
return cap;
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple);
|
|
|
|
struct power_supply_battery_ocv_table *
|
|
power_supply_find_ocv2cap_table(struct power_supply_battery_info *info,
|
|
int temp, int *table_len)
|
|
{
|
|
int best_temp_diff = INT_MAX, temp_diff;
|
|
u8 i, best_index = 0;
|
|
|
|
if (!info->ocv_table[0])
|
|
return NULL;
|
|
|
|
for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) {
|
|
temp_diff = abs(info->ocv_temp[i] - temp);
|
|
|
|
if (temp_diff < best_temp_diff) {
|
|
best_temp_diff = temp_diff;
|
|
best_index = i;
|
|
}
|
|
}
|
|
|
|
*table_len = info->ocv_table_size[best_index];
|
|
return info->ocv_table[best_index];
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table);
|
|
|
|
int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info,
|
|
int ocv, int temp)
|
|
{
|
|
struct power_supply_battery_ocv_table *table;
|
|
int table_len;
|
|
|
|
table = power_supply_find_ocv2cap_table(info, temp, &table_len);
|
|
if (!table)
|
|
return -EINVAL;
|
|
|
|
return power_supply_ocv2cap_simple(table, table_len, ocv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap);
|
|
|
|
int power_supply_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
if (atomic_read(&psy->use_cnt) <= 0) {
|
|
if (!psy->initialized)
|
|
return -EAGAIN;
|
|
return -ENODEV;
|
|
}
|
|
|
|
return psy->desc->get_property(psy, psp, val);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_get_property);
|
|
|
|
int power_supply_set_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
const union power_supply_propval *val)
|
|
{
|
|
if (atomic_read(&psy->use_cnt) <= 0 || !psy->desc->set_property)
|
|
return -ENODEV;
|
|
|
|
return psy->desc->set_property(psy, psp, val);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_set_property);
|
|
|
|
int power_supply_property_is_writeable(struct power_supply *psy,
|
|
enum power_supply_property psp)
|
|
{
|
|
if (atomic_read(&psy->use_cnt) <= 0 ||
|
|
!psy->desc->property_is_writeable)
|
|
return -ENODEV;
|
|
|
|
return psy->desc->property_is_writeable(psy, psp);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);
|
|
|
|
void power_supply_external_power_changed(struct power_supply *psy)
|
|
{
|
|
if (atomic_read(&psy->use_cnt) <= 0 ||
|
|
!psy->desc->external_power_changed)
|
|
return;
|
|
|
|
psy->desc->external_power_changed(psy);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_external_power_changed);
|
|
|
|
int power_supply_powers(struct power_supply *psy, struct device *dev)
|
|
{
|
|
return sysfs_create_link(&psy->dev.kobj, &dev->kobj, "powers");
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_powers);
|
|
|
|
static void power_supply_dev_release(struct device *dev)
|
|
{
|
|
struct power_supply *psy = to_power_supply(dev);
|
|
dev_dbg(dev, "%s\n", __func__);
|
|
kfree(psy);
|
|
}
|
|
|
|
int power_supply_reg_notifier(struct notifier_block *nb)
|
|
{
|
|
return atomic_notifier_chain_register(&power_supply_notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
|
|
|
|
void power_supply_unreg_notifier(struct notifier_block *nb)
|
|
{
|
|
atomic_notifier_chain_unregister(&power_supply_notifier, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
|
|
|
|
#ifdef CONFIG_THERMAL
|
|
static int power_supply_read_temp(struct thermal_zone_device *tzd,
|
|
int *temp)
|
|
{
|
|
struct power_supply *psy;
|
|
union power_supply_propval val;
|
|
int ret;
|
|
|
|
WARN_ON(tzd == NULL);
|
|
psy = tzd->devdata;
|
|
ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Convert tenths of degree Celsius to milli degree Celsius. */
|
|
*temp = val.intval * 100;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct thermal_zone_device_ops psy_tzd_ops = {
|
|
.get_temp = power_supply_read_temp,
|
|
};
|
|
|
|
static int psy_register_thermal(struct power_supply *psy)
|
|
{
|
|
int i, ret;
|
|
|
|
if (psy->desc->no_thermal)
|
|
return 0;
|
|
|
|
/* Register battery zone device psy reports temperature */
|
|
for (i = 0; i < psy->desc->num_properties; i++) {
|
|
if (psy->desc->properties[i] == POWER_SUPPLY_PROP_TEMP) {
|
|
psy->tzd = thermal_zone_device_register(psy->desc->name,
|
|
0, 0, psy, &psy_tzd_ops, NULL, 0, 0);
|
|
if (IS_ERR(psy->tzd))
|
|
return PTR_ERR(psy->tzd);
|
|
ret = thermal_zone_device_enable(psy->tzd);
|
|
if (ret)
|
|
thermal_zone_device_unregister(psy->tzd);
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void psy_unregister_thermal(struct power_supply *psy)
|
|
{
|
|
if (IS_ERR_OR_NULL(psy->tzd))
|
|
return;
|
|
thermal_zone_device_unregister(psy->tzd);
|
|
}
|
|
|
|
/* thermal cooling device callbacks */
|
|
static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
|
|
unsigned long *state)
|
|
{
|
|
struct power_supply *psy;
|
|
union power_supply_propval val;
|
|
int ret;
|
|
|
|
psy = tcd->devdata;
|
|
ret = power_supply_get_property(psy,
|
|
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*state = val.intval;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ps_get_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
|
|
unsigned long *state)
|
|
{
|
|
struct power_supply *psy;
|
|
union power_supply_propval val;
|
|
int ret;
|
|
|
|
psy = tcd->devdata;
|
|
ret = power_supply_get_property(psy,
|
|
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*state = val.intval;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
|
|
unsigned long state)
|
|
{
|
|
struct power_supply *psy;
|
|
union power_supply_propval val;
|
|
int ret;
|
|
|
|
psy = tcd->devdata;
|
|
val.intval = state;
|
|
ret = psy->desc->set_property(psy,
|
|
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct thermal_cooling_device_ops psy_tcd_ops = {
|
|
.get_max_state = ps_get_max_charge_cntl_limit,
|
|
.get_cur_state = ps_get_cur_charge_cntl_limit,
|
|
.set_cur_state = ps_set_cur_charge_cntl_limit,
|
|
};
|
|
|
|
static int psy_register_cooler(struct power_supply *psy)
|
|
{
|
|
int i;
|
|
|
|
/* Register for cooling device if psy can control charging */
|
|
for (i = 0; i < psy->desc->num_properties; i++) {
|
|
if (psy->desc->properties[i] ==
|
|
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
|
|
psy->tcd = thermal_cooling_device_register(
|
|
(char *)psy->desc->name,
|
|
psy, &psy_tcd_ops);
|
|
return PTR_ERR_OR_ZERO(psy->tcd);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void psy_unregister_cooler(struct power_supply *psy)
|
|
{
|
|
if (IS_ERR_OR_NULL(psy->tcd))
|
|
return;
|
|
thermal_cooling_device_unregister(psy->tcd);
|
|
}
|
|
#else
|
|
static int psy_register_thermal(struct power_supply *psy)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void psy_unregister_thermal(struct power_supply *psy)
|
|
{
|
|
}
|
|
|
|
static int psy_register_cooler(struct power_supply *psy)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void psy_unregister_cooler(struct power_supply *psy)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static struct power_supply *__must_check
|
|
__power_supply_register(struct device *parent,
|
|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg,
|
|
bool ws)
|
|
{
|
|
struct device *dev;
|
|
struct power_supply *psy;
|
|
int i, rc;
|
|
|
|
if (!parent)
|
|
pr_warn("%s: Expected proper parent device for '%s'\n",
|
|
__func__, desc->name);
|
|
|
|
if (!desc || !desc->name || !desc->properties || !desc->num_properties)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
for (i = 0; i < desc->num_properties; ++i) {
|
|
if ((desc->properties[i] == POWER_SUPPLY_PROP_USB_TYPE) &&
|
|
(!desc->usb_types || !desc->num_usb_types))
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
psy = kzalloc(sizeof(*psy), GFP_KERNEL);
|
|
if (!psy)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
dev = &psy->dev;
|
|
|
|
device_initialize(dev);
|
|
|
|
dev->class = power_supply_class;
|
|
dev->type = &power_supply_dev_type;
|
|
dev->parent = parent;
|
|
dev->release = power_supply_dev_release;
|
|
dev_set_drvdata(dev, psy);
|
|
psy->desc = desc;
|
|
if (cfg) {
|
|
dev->groups = cfg->attr_grp;
|
|
psy->drv_data = cfg->drv_data;
|
|
psy->of_node =
|
|
cfg->fwnode ? to_of_node(cfg->fwnode) : cfg->of_node;
|
|
psy->supplied_to = cfg->supplied_to;
|
|
psy->num_supplicants = cfg->num_supplicants;
|
|
}
|
|
|
|
rc = dev_set_name(dev, "%s", desc->name);
|
|
if (rc)
|
|
goto dev_set_name_failed;
|
|
|
|
INIT_WORK(&psy->changed_work, power_supply_changed_work);
|
|
INIT_DELAYED_WORK(&psy->deferred_register_work,
|
|
power_supply_deferred_register_work);
|
|
|
|
rc = power_supply_check_supplies(psy);
|
|
if (rc) {
|
|
dev_dbg(dev, "Not all required supplies found, defer probe\n");
|
|
goto check_supplies_failed;
|
|
}
|
|
|
|
spin_lock_init(&psy->changed_lock);
|
|
rc = device_add(dev);
|
|
if (rc)
|
|
goto device_add_failed;
|
|
|
|
rc = device_init_wakeup(dev, ws);
|
|
if (rc)
|
|
goto wakeup_init_failed;
|
|
|
|
rc = psy_register_thermal(psy);
|
|
if (rc)
|
|
goto register_thermal_failed;
|
|
|
|
rc = psy_register_cooler(psy);
|
|
if (rc)
|
|
goto register_cooler_failed;
|
|
|
|
rc = power_supply_create_triggers(psy);
|
|
if (rc)
|
|
goto create_triggers_failed;
|
|
|
|
rc = power_supply_add_hwmon_sysfs(psy);
|
|
if (rc)
|
|
goto add_hwmon_sysfs_failed;
|
|
|
|
/*
|
|
* Update use_cnt after any uevents (most notably from device_add()).
|
|
* We are here still during driver's probe but
|
|
* the power_supply_uevent() calls back driver's get_property
|
|
* method so:
|
|
* 1. Driver did not assigned the returned struct power_supply,
|
|
* 2. Driver could not finish initialization (anything in its probe
|
|
* after calling power_supply_register()).
|
|
*/
|
|
atomic_inc(&psy->use_cnt);
|
|
psy->initialized = true;
|
|
|
|
queue_delayed_work(system_power_efficient_wq,
|
|
&psy->deferred_register_work,
|
|
POWER_SUPPLY_DEFERRED_REGISTER_TIME);
|
|
|
|
return psy;
|
|
|
|
add_hwmon_sysfs_failed:
|
|
power_supply_remove_triggers(psy);
|
|
create_triggers_failed:
|
|
psy_unregister_cooler(psy);
|
|
register_cooler_failed:
|
|
psy_unregister_thermal(psy);
|
|
register_thermal_failed:
|
|
device_del(dev);
|
|
wakeup_init_failed:
|
|
device_add_failed:
|
|
check_supplies_failed:
|
|
dev_set_name_failed:
|
|
put_device(dev);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
/**
|
|
* power_supply_register() - Register new power supply
|
|
* @parent: Device to be a parent of power supply's device, usually
|
|
* the device which probe function calls this
|
|
* @desc: Description of power supply, must be valid through whole
|
|
* lifetime of this power supply
|
|
* @cfg: Run-time specific configuration accessed during registering,
|
|
* may be NULL
|
|
*
|
|
* Return: A pointer to newly allocated power_supply on success
|
|
* or ERR_PTR otherwise.
|
|
* Use power_supply_unregister() on returned power_supply pointer to release
|
|
* resources.
|
|
*/
|
|
struct power_supply *__must_check power_supply_register(struct device *parent,
|
|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg)
|
|
{
|
|
return __power_supply_register(parent, desc, cfg, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_register);
|
|
|
|
/**
|
|
* power_supply_register_no_ws() - Register new non-waking-source power supply
|
|
* @parent: Device to be a parent of power supply's device, usually
|
|
* the device which probe function calls this
|
|
* @desc: Description of power supply, must be valid through whole
|
|
* lifetime of this power supply
|
|
* @cfg: Run-time specific configuration accessed during registering,
|
|
* may be NULL
|
|
*
|
|
* Return: A pointer to newly allocated power_supply on success
|
|
* or ERR_PTR otherwise.
|
|
* Use power_supply_unregister() on returned power_supply pointer to release
|
|
* resources.
|
|
*/
|
|
struct power_supply *__must_check
|
|
power_supply_register_no_ws(struct device *parent,
|
|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg)
|
|
{
|
|
return __power_supply_register(parent, desc, cfg, false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_register_no_ws);
|
|
|
|
static void devm_power_supply_release(struct device *dev, void *res)
|
|
{
|
|
struct power_supply **psy = res;
|
|
|
|
power_supply_unregister(*psy);
|
|
}
|
|
|
|
/**
|
|
* devm_power_supply_register() - Register managed power supply
|
|
* @parent: Device to be a parent of power supply's device, usually
|
|
* the device which probe function calls this
|
|
* @desc: Description of power supply, must be valid through whole
|
|
* lifetime of this power supply
|
|
* @cfg: Run-time specific configuration accessed during registering,
|
|
* may be NULL
|
|
*
|
|
* Return: A pointer to newly allocated power_supply on success
|
|
* or ERR_PTR otherwise.
|
|
* The returned power_supply pointer will be automatically unregistered
|
|
* on driver detach.
|
|
*/
|
|
struct power_supply *__must_check
|
|
devm_power_supply_register(struct device *parent,
|
|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg)
|
|
{
|
|
struct power_supply **ptr, *psy;
|
|
|
|
ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
|
|
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
psy = __power_supply_register(parent, desc, cfg, true);
|
|
if (IS_ERR(psy)) {
|
|
devres_free(ptr);
|
|
} else {
|
|
*ptr = psy;
|
|
devres_add(parent, ptr);
|
|
}
|
|
return psy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_power_supply_register);
|
|
|
|
/**
|
|
* devm_power_supply_register_no_ws() - Register managed non-waking-source power supply
|
|
* @parent: Device to be a parent of power supply's device, usually
|
|
* the device which probe function calls this
|
|
* @desc: Description of power supply, must be valid through whole
|
|
* lifetime of this power supply
|
|
* @cfg: Run-time specific configuration accessed during registering,
|
|
* may be NULL
|
|
*
|
|
* Return: A pointer to newly allocated power_supply on success
|
|
* or ERR_PTR otherwise.
|
|
* The returned power_supply pointer will be automatically unregistered
|
|
* on driver detach.
|
|
*/
|
|
struct power_supply *__must_check
|
|
devm_power_supply_register_no_ws(struct device *parent,
|
|
const struct power_supply_desc *desc,
|
|
const struct power_supply_config *cfg)
|
|
{
|
|
struct power_supply **ptr, *psy;
|
|
|
|
ptr = devres_alloc(devm_power_supply_release, sizeof(*ptr), GFP_KERNEL);
|
|
|
|
if (!ptr)
|
|
return ERR_PTR(-ENOMEM);
|
|
psy = __power_supply_register(parent, desc, cfg, false);
|
|
if (IS_ERR(psy)) {
|
|
devres_free(ptr);
|
|
} else {
|
|
*ptr = psy;
|
|
devres_add(parent, ptr);
|
|
}
|
|
return psy;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws);
|
|
|
|
/**
|
|
* power_supply_unregister() - Remove this power supply from system
|
|
* @psy: Pointer to power supply to unregister
|
|
*
|
|
* Remove this power supply from the system. The resources of power supply
|
|
* will be freed here or on last power_supply_put() call.
|
|
*/
|
|
void power_supply_unregister(struct power_supply *psy)
|
|
{
|
|
WARN_ON(atomic_dec_return(&psy->use_cnt));
|
|
psy->removing = true;
|
|
cancel_work_sync(&psy->changed_work);
|
|
cancel_delayed_work_sync(&psy->deferred_register_work);
|
|
sysfs_remove_link(&psy->dev.kobj, "powers");
|
|
power_supply_remove_hwmon_sysfs(psy);
|
|
power_supply_remove_triggers(psy);
|
|
psy_unregister_cooler(psy);
|
|
psy_unregister_thermal(psy);
|
|
device_init_wakeup(&psy->dev, false);
|
|
device_unregister(&psy->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_unregister);
|
|
|
|
void *power_supply_get_drvdata(struct power_supply *psy)
|
|
{
|
|
return psy->drv_data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_get_drvdata);
|
|
|
|
static int __init power_supply_class_init(void)
|
|
{
|
|
power_supply_class = class_create(THIS_MODULE, "power_supply");
|
|
|
|
if (IS_ERR(power_supply_class))
|
|
return PTR_ERR(power_supply_class);
|
|
|
|
power_supply_class->dev_uevent = power_supply_uevent;
|
|
power_supply_init_attrs(&power_supply_dev_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit power_supply_class_exit(void)
|
|
{
|
|
class_destroy(power_supply_class);
|
|
}
|
|
|
|
subsys_initcall(power_supply_class_init);
|
|
module_exit(power_supply_class_exit);
|
|
|
|
MODULE_DESCRIPTION("Universal power supply monitor class");
|
|
MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
|
|
"Szabolcs Gyurko, "
|
|
"Anton Vorontsov <cbou@mail.ru>");
|
|
MODULE_LICENSE("GPL");
|