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1387 lines
37 KiB
1387 lines
37 KiB
// 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 <[email protected]> |
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* Copyright © 2004 Szabolcs Gyurko |
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* Copyright © 2003 Ian Molton <[email protected]> |
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* |
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* Modified: 2004, Oct Szabolcs Gyurko |
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*/ |
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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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|
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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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|
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ATOMIC_NOTIFIER_HEAD(power_supply_notifier); |
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EXPORT_SYMBOL_GPL(power_supply_notifier); |
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|
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static struct device_type power_supply_dev_type; |
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|
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#define POWER_SUPPLY_DEFERRED_REGISTER_TIME msecs_to_jiffies(10) |
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|
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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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|
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if (!supply->supplied_from && !supplier->supplied_to) |
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return false; |
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|
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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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|
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return false; |
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} |
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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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|
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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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|
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return 0; |
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} |
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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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|
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dev_dbg(&psy->dev, "%s\n", __func__); |
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|
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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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/* |
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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if (np == epsy->of_node) { |
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dev_info(&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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|
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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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|
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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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|
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return 0; |
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} |
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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ret = power_supply_find_supply_from_node(np); |
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of_node_put(np); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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if (!psy->desc->set_property) |
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return -EINVAL; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return strcmp(psy->desc->name, name) == 0; |
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} |
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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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/** |
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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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|
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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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{ |
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struct power_supply **psy = res; |
|
|
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power_supply_put(*psy); |
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} |
|
|
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/** |
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* devm_power_supply_get_by_phandle() - Resource managed version of |
|
* power_supply_get_by_phandle() |
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* @dev: Pointer to device holding phandle property |
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* @property: Name of property holding a power supply phandle |
|
* |
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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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struct power_supply *devm_power_supply_get_by_phandle(struct device *dev, |
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const char *property) |
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{ |
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struct power_supply **ptr, *psy; |
|
|
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if (!dev->of_node) |
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return ERR_PTR(-ENODEV); |
|
|
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ptr = devres_alloc(devm_power_supply_put, sizeof(*ptr), GFP_KERNEL); |
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if (!ptr) |
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return ERR_PTR(-ENOMEM); |
|
|
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psy = power_supply_get_by_phandle(dev->of_node, property); |
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if (IS_ERR_OR_NULL(psy)) { |
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devres_free(ptr); |
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} else { |
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*ptr = psy; |
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devres_add(dev, ptr); |
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} |
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return psy; |
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} |
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EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle); |
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#endif /* CONFIG_OF */ |
|
|
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int power_supply_get_battery_info(struct power_supply *psy, |
|
struct power_supply_battery_info *info) |
|
{ |
|
struct power_supply_resistance_temp_table *resist_table; |
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struct device_node *battery_np; |
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const char *value; |
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int err, len, index; |
|
const __be32 *list; |
|
|
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info->energy_full_design_uwh = -EINVAL; |
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info->charge_full_design_uah = -EINVAL; |
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info->voltage_min_design_uv = -EINVAL; |
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info->voltage_max_design_uv = -EINVAL; |
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info->precharge_current_ua = -EINVAL; |
|
info->charge_term_current_ua = -EINVAL; |
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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_info(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 <[email protected]>, " |
|
"Szabolcs Gyurko, " |
|
"Anton Vorontsov <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|