Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1493 insertions, 0 deletions

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
new file mode 100644
index 000000000..ac88c9636
--- /dev/null
+++ b/drivers/power/supply/power_supply_core.c
@@ -0,0 +1,1493 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Universal power supply monitor class
+ *
+ *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
+ *  Copyright © 2004  Szabolcs Gyurko
+ *  Copyright © 2003  Ian Molton <spyro@f2s.com>
+ *
+ *  Modified: 2004, Oct     Szabolcs Gyurko
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/notifier.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/power_supply.h>
+#include <linux/property.h>
+#include <linux/thermal.h>
+#include <linux/fixp-arith.h>
+#include "power_supply.h"
+#include "samsung-sdi-battery.h"
+
+/* exported for the APM Power driver, APM emulation */
+struct class *power_supply_class;
+EXPORT_SYMBOL_GPL(power_supply_class);
+
+BLOCKING_NOTIFIER_HEAD(power_supply_notifier);
+EXPORT_SYMBOL_GPL(power_supply_notifier);
+
+static struct device_type power_supply_dev_type;
+
+#define POWER_SUPPLY_DEFERRED_REGISTER_TIME	msecs_to_jiffies(10)
+
+static bool __power_supply_is_supplied_by(struct power_supply *supplier,
+					 struct power_supply *supply)
+{
+	int i;
+
+	if (!supply->supplied_from && !supplier->supplied_to)
+		return false;
+
+	/* Support both supplied_to and supplied_from modes */
+	if (supply->supplied_from) {
+		if (!supplier->desc->name)
+			return false;
+		for (i = 0; i < supply->num_supplies; i++)
+			if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
+				return true;
+	} else {
+		if (!supply->desc->name)
+			return false;
+		for (i = 0; i < supplier->num_supplicants; i++)
+			if (!strcmp(supplier->supplied_to[i], supply->desc->name))
+				return true;
+	}
+
+	return false;
+}
+
+static int __power_supply_changed_work(struct device *dev, void *data)
+{
+	struct power_supply *psy = data;
+	struct power_supply *pst = dev_get_drvdata(dev);
+
+	if (__power_supply_is_supplied_by(psy, pst)) {
+		if (pst->desc->external_power_changed)
+			pst->desc->external_power_changed(pst);
+	}
+
+	return 0;
+}
+
+static void power_supply_changed_work(struct work_struct *work)
+{
+	unsigned long flags;
+	struct power_supply *psy = container_of(work, struct power_supply,
+						changed_work);
+
+	dev_dbg(&psy->dev, "%s\n", __func__);
+
+	spin_lock_irqsave(&psy->changed_lock, flags);
+	/*
+	 * Check 'changed' here to avoid issues due to race between
+	 * power_supply_changed() and this routine. In worst case
+	 * power_supply_changed() can be called again just before we take above
+	 * lock. During the first call of this routine we will mark 'changed' as
+	 * false and it will stay false for the next call as well.
+	 */
+	if (likely(psy->changed)) {
+		psy->changed = false;
+		spin_unlock_irqrestore(&psy->changed_lock, flags);
+		class_for_each_device(power_supply_class, NULL, psy,
+				      __power_supply_changed_work);
+		power_supply_update_leds(psy);
+		blocking_notifier_call_chain(&power_supply_notifier,
+				PSY_EVENT_PROP_CHANGED, psy);
+		kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE);
+		spin_lock_irqsave(&psy->changed_lock, flags);
+	}
+
+	/*
+	 * Hold the wakeup_source until all events are processed.
+	 * power_supply_changed() might have called again and have set 'changed'
+	 * to true.
+	 */
+	if (likely(!psy->changed))
+		pm_relax(&psy->dev);
+	spin_unlock_irqrestore(&psy->changed_lock, flags);
+}
+
+void power_supply_changed(struct power_supply *psy)
+{
+	unsigned long flags;
+
+	dev_dbg(&psy->dev, "%s\n", __func__);
+
+	spin_lock_irqsave(&psy->changed_lock, flags);
+	psy->changed = true;
+	pm_stay_awake(&psy->dev);
+	spin_unlock_irqrestore(&psy->changed_lock, flags);
+	schedule_work(&psy->changed_work);
+}
+EXPORT_SYMBOL_GPL(power_supply_changed);
+
+/*
+ * Notify that power supply was registered after parent finished the probing.
+ *
+ * Often power supply is registered from driver's probe function. However
+ * calling power_supply_changed() directly from power_supply_register()
+ * would lead to execution of get_property() function provided by the driver
+ * too early - before the probe ends.
+ *
+ * Avoid that by waiting on parent's mutex.
+ */
+static void power_supply_deferred_register_work(struct work_struct *work)
+{
+	struct power_supply *psy = container_of(work, struct power_supply,
+						deferred_register_work.work);
+
+	if (psy->dev.parent) {
+		while (!mutex_trylock(&psy->dev.parent->mutex)) {
+			if (psy->removing)
+				return;
+			msleep(10);
+		}
+	}
+
+	power_supply_changed(psy);
+
+	if (psy->dev.parent)
+		mutex_unlock(&psy->dev.parent->mutex);
+}
+
+#ifdef CONFIG_OF
+static int __power_supply_populate_supplied_from(struct device *dev,
+						 void *data)
+{
+	struct power_supply *psy = data;
+	struct power_supply *epsy = dev_get_drvdata(dev);
+	struct device_node *np;
+	int i = 0;
+
+	do {
+		np = of_parse_phandle(psy->of_node, "power-supplies", i++);
+		if (!np)
+			break;
+
+		if (np == epsy->of_node) {
+			dev_dbg(&psy->dev, "%s: Found supply : %s\n",
+				psy->desc->name, epsy->desc->name);
+			psy->supplied_from[i-1] = (char *)epsy->desc->name;
+			psy->num_supplies++;
+			of_node_put(np);
+			break;
+		}
+		of_node_put(np);
+	} while (np);
+
+	return 0;
+}
+
+static int power_supply_populate_supplied_from(struct power_supply *psy)
+{
+	int error;
+
+	error = class_for_each_device(power_supply_class, NULL, psy,
+				      __power_supply_populate_supplied_from);
+
+	dev_dbg(&psy->dev, "%s %d\n", __func__, error);
+
+	return error;
+}
+
+static int  __power_supply_find_supply_from_node(struct device *dev,
+						 void *data)
+{
+	struct device_node *np = data;
+	struct power_supply *epsy = dev_get_drvdata(dev);
+
+	/* returning non-zero breaks out of class_for_each_device loop */
+	if (epsy->of_node == np)
+		return 1;
+
+	return 0;
+}
+
+static int power_supply_find_supply_from_node(struct device_node *supply_node)
+{
+	int error;
+
+	/*
+	 * class_for_each_device() either returns its own errors or values
+	 * returned by __power_supply_find_supply_from_node().
+	 *
+	 * __power_supply_find_supply_from_node() will return 0 (no match)
+	 * or 1 (match).
+	 *
+	 * We return 0 if class_for_each_device() returned 1, -EPROBE_DEFER if
+	 * it returned 0, or error as returned by it.
+	 */
+	error = class_for_each_device(power_supply_class, NULL, supply_node,
+				       __power_supply_find_supply_from_node);
+
+	return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
+}
+
+static int power_supply_check_supplies(struct power_supply *psy)
+{
+	struct device_node *np;
+	int cnt = 0;
+
+	/* If there is already a list honor it */
+	if (psy->supplied_from && psy->num_supplies > 0)
+		return 0;
+
+	/* No device node found, nothing to do */
+	if (!psy->of_node)
+		return 0;
+
+	do {
+		int ret;
+
+		np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
+		if (!np)
+			break;
+
+		ret = power_supply_find_supply_from_node(np);
+		of_node_put(np);
+
+		if (ret) {
+			dev_dbg(&psy->dev, "Failed to find supply!\n");
+			return ret;
+		}
+	} while (np);
+
+	/* Missing valid "power-supplies" entries */
+	if (cnt == 1)
+		return 0;
+
+	/* All supplies found, allocate char ** array for filling */
+	psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(*psy->supplied_from),
+					  GFP_KERNEL);
+	if (!psy->supplied_from)
+		return -ENOMEM;
+
+	*psy->supplied_from = devm_kcalloc(&psy->dev,
+					   cnt - 1, sizeof(**psy->supplied_from),
+					   GFP_KERNEL);
+	if (!*psy->supplied_from)
+		return -ENOMEM;
+
+	return power_supply_populate_supplied_from(psy);
+}
+#else
+static int power_supply_check_supplies(struct power_supply *psy)
+{
+	int nval, ret;
+
+	if (!psy->dev.parent)
+		return 0;
+
+	nval = device_property_string_array_count(psy->dev.parent, "supplied-from");
+	if (nval <= 0)
+		return 0;
+
+	psy->supplied_from = devm_kmalloc_array(&psy->dev, nval,
+						sizeof(char *), GFP_KERNEL);
+	if (!psy->supplied_from)
+		return -ENOMEM;
+
+	ret = device_property_read_string_array(psy->dev.parent,
+		"supplied-from", (const char **)psy->supplied_from, nval);
+	if (ret < 0)
+		return ret;
+
+	psy->num_supplies = nval;
+
+	return 0;
+}
+#endif
+
+struct psy_am_i_supplied_data {
+	struct power_supply *psy;
+	unsigned int count;
+};
+
+static int __power_supply_am_i_supplied(struct device *dev, void *_data)
+{
+	union power_supply_propval ret = {0,};
+	struct power_supply *epsy = dev_get_drvdata(dev);
+	struct psy_am_i_supplied_data *data = _data;
+
+	if (__power_supply_is_supplied_by(epsy, data->psy)) {
+		data->count++;
+		if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
+					&ret))
+			return ret.intval;
+	}
+
+	return 0;
+}
+
+int power_supply_am_i_supplied(struct power_supply *psy)
+{
+	struct psy_am_i_supplied_data data = { psy, 0 };
+	int error;
+
+	error = class_for_each_device(power_supply_class, NULL, &data,
+				      __power_supply_am_i_supplied);
+
+	dev_dbg(&psy->dev, "%s count %u err %d\n", __func__, data.count, error);
+
+	if (data.count == 0)
+		return -ENODEV;
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
+
+static int __power_supply_is_system_supplied(struct device *dev, void *data)
+{
+	union power_supply_propval ret = {0,};
+	struct power_supply *psy = dev_get_drvdata(dev);
+	unsigned int *count = data;
+
+	if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_SCOPE, &ret))
+		if (ret.intval == POWER_SUPPLY_SCOPE_DEVICE)
+			return 0;
+
+	(*count)++;
+	if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY)
+		if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE,
+					&ret))
+			return ret.intval;
+
+	return 0;
+}
+
+int power_supply_is_system_supplied(void)
+{
+	int error;
+	unsigned int count = 0;
+
+	error = class_for_each_device(power_supply_class, NULL, &count,
+				      __power_supply_is_system_supplied);
+
+	/*
+	 * If no system scope power class device was found at all, most probably we
+	 * are running on a desktop system, so assume we are on mains power.
+	 */
+	if (count == 0)
+		return 1;
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
+
+struct psy_get_supplier_prop_data {
+	struct power_supply *psy;
+	enum power_supply_property psp;
+	union power_supply_propval *val;
+};
+
+static int __power_supply_get_supplier_property(struct device *dev, void *_data)
+{
+	struct power_supply *epsy = dev_get_drvdata(dev);
+	struct psy_get_supplier_prop_data *data = _data;
+
+	if (__power_supply_is_supplied_by(epsy, data->psy))
+		if (!epsy->desc->get_property(epsy, data->psp, data->val))
+			return 1; /* Success */
+
+	return 0; /* Continue iterating */
+}
+
+int power_supply_get_property_from_supplier(struct power_supply *psy,
+					    enum power_supply_property psp,
+					    union power_supply_propval *val)
+{
+	struct psy_get_supplier_prop_data data = {
+		.psy = psy,
+		.psp = psp,
+		.val = val,
+	};
+	int ret;
+
+	/*
+	 * This function is not intended for use with a supply with multiple
+	 * suppliers, we simply pick the first supply to report the psp.
+	 */
+	ret = class_for_each_device(power_supply_class, NULL, &data,
+				    __power_supply_get_supplier_property);
+	if (ret < 0)
+		return ret;
+	if (ret == 0)
+		return -ENODEV;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(power_supply_get_property_from_supplier);
+
+int power_supply_set_battery_charged(struct power_supply *psy)
+{
+	if (atomic_read(&psy->use_cnt) >= 0 &&
+			psy->desc->type == POWER_SUPPLY_TYPE_BATTERY &&
+			psy->desc->set_charged) {
+		psy->desc->set_charged(psy);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
+
+static int power_supply_match_device_by_name(struct device *dev, const void *data)
+{
+	const char *name = data;
+	struct power_supply *psy = dev_get_drvdata(dev);
+
+	return strcmp(psy->desc->name, name) == 0;
+}
+
+/**
+ * power_supply_get_by_name() - Search for a power supply and returns its ref
+ * @name: Power supply name to fetch
+ *
+ * If power supply was found, it increases reference count for the
+ * internal power supply's device. The user should power_supply_put()
+ * after usage.
+ *
+ * Return: On success returns a reference to a power supply with
+ * matching name equals to @name, a NULL otherwise.
+ */
+struct power_supply *power_supply_get_by_name(const char *name)
+{
+	struct power_supply *psy = NULL;
+	struct device *dev = class_find_device(power_supply_class, NULL, name,
+					power_supply_match_device_by_name);
+
+	if (dev) {
+		psy = dev_get_drvdata(dev);
+		atomic_inc(&psy->use_cnt);
+	}
+
+	return psy;
+}
+EXPORT_SYMBOL_GPL(power_supply_get_by_name);
+
+/**
+ * power_supply_put() - Drop reference obtained with power_supply_get_by_name
+ * @psy: Reference to put
+ *
+ * The reference to power supply should be put before unregistering
+ * the power supply.
+ */
+void power_supply_put(struct power_supply *psy)
+{
+	might_sleep();
+
+	atomic_dec(&psy->use_cnt);
+	put_device(&psy->dev);
+}
+EXPORT_SYMBOL_GPL(power_supply_put);
+
+#ifdef CONFIG_OF
+static int power_supply_match_device_node(struct device *dev, const void *data)
+{
+	return dev->parent && dev->parent->of_node == data;
+}
+
+/**
+ * power_supply_get_by_phandle() - Search for a power supply and returns its ref
+ * @np: Pointer to device node holding phandle property
+ * @property: Name of property holding a power supply name
+ *
+ * If power supply was found, it increases reference count for the
+ * internal power supply's device. The user should power_supply_put()
+ * after usage.
+ *
+ * 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 *power_supply_get_by_phandle(struct device_node *np,
+							const char *property)
+{
+	struct device_node *power_supply_np;
+	struct power_supply *psy = NULL;
+	struct device *dev;
+
+	power_supply_np = of_parse_phandle(np, property, 0);
+	if (!power_supply_np)
+		return ERR_PTR(-ENODEV);
+
+	dev = class_find_device(power_supply_class, NULL, power_supply_np,
+						power_supply_match_device_node);
+
+	of_node_put(power_supply_np);
+
+	if (dev) {
+		psy = dev_get_drvdata(dev);
+		atomic_inc(&psy->use_cnt);
+	}
+
+	return psy;
+}
+EXPORT_SYMBOL_GPL(power_supply_get_by_phandle);
+
+static void devm_power_supply_put(struct device *dev, void *res)
+{
+	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_out)
+{
+	struct power_supply_resistance_temp_table *resist_table;
+	struct power_supply_battery_info *info;
+	struct device_node *battery_np = NULL;
+	struct fwnode_reference_args args;
+	struct fwnode_handle *fwnode;
+	const char *value;
+	int err, len, index;
+	const __be32 *list;
+	u32 min_max[2];
+
+	if (psy->of_node) {
+		battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
+		if (!battery_np)
+			return -ENODEV;
+
+		fwnode = fwnode_handle_get(of_fwnode_handle(battery_np));
+	} else {
+		err = fwnode_property_get_reference_args(
+					dev_fwnode(psy->dev.parent),
+					"monitored-battery", NULL, 0, 0, &args);
+		if (err)
+			return err;
+
+		fwnode = args.fwnode;
+	}
+
+	err = fwnode_property_read_string(fwnode, "compatible", &value);
+	if (err)
+		goto out_put_node;
+
+
+	/* Try static batteries first */
+	err = samsung_sdi_battery_get_info(&psy->dev, value, &info);
+	if (!err)
+		goto out_ret_pointer;
+	else if (err == -ENODEV)
+		/*
+		 * Device does not have a static battery.
+		 * Proceed to look for a simple battery.
+		 */
+		err = 0;
+
+	if (strcmp("simple-battery", value)) {
+		err = -ENODEV;
+		goto out_put_node;
+	}
+
+	info = devm_kzalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		err = -ENOMEM;
+		goto out_put_node;
+	}
+
+	info->technology                     = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
+	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->tricklecharge_current_ua       = -EINVAL;
+	info->precharge_voltage_max_uv       = -EINVAL;
+	info->charge_restart_voltage_uv      = -EINVAL;
+	info->overvoltage_limit_uv           = -EINVAL;
+	info->maintenance_charge             = NULL;
+	info->alert_low_temp_charge_current_ua = -EINVAL;
+	info->alert_low_temp_charge_voltage_uv = -EINVAL;
+	info->alert_high_temp_charge_current_ua = -EINVAL;
+	info->alert_high_temp_charge_voltage_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;
+	info->bti_resistance_ohm             = -EINVAL;
+	info->bti_resistance_tolerance       = -EINVAL;
+
+	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;
+	}
+
+	/* The property and field names below must correspond to elements
+	 * in enum power_supply_property. For reasoning, see
+	 * Documentation/power/power_supply_class.rst.
+	 */
+
+	if (!fwnode_property_read_string(fwnode, "device-chemistry", &value)) {
+		if (!strcmp("nickel-cadmium", value))
+			info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
+		else if (!strcmp("nickel-metal-hydride", value))
+			info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
+		else if (!strcmp("lithium-ion", value))
+			/* Imprecise lithium-ion type */
+			info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
+		else if (!strcmp("lithium-ion-polymer", value))
+			info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
+		else if (!strcmp("lithium-ion-iron-phosphate", value))
+			info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
+		else if (!strcmp("lithium-ion-manganese-oxide", value))
+			info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
+		else
+			dev_warn(&psy->dev, "%s unknown battery type\n", value);
+	}
+
+	fwnode_property_read_u32(fwnode, "energy-full-design-microwatt-hours",
+			     &info->energy_full_design_uwh);
+	fwnode_property_read_u32(fwnode, "charge-full-design-microamp-hours",
+			     &info->charge_full_design_uah);
+	fwnode_property_read_u32(fwnode, "voltage-min-design-microvolt",
+			     &info->voltage_min_design_uv);
+	fwnode_property_read_u32(fwnode, "voltage-max-design-microvolt",
+			     &info->voltage_max_design_uv);
+	fwnode_property_read_u32(fwnode, "trickle-charge-current-microamp",
+			     &info->tricklecharge_current_ua);
+	fwnode_property_read_u32(fwnode, "precharge-current-microamp",
+			     &info->precharge_current_ua);
+	fwnode_property_read_u32(fwnode, "precharge-upper-limit-microvolt",
+			     &info->precharge_voltage_max_uv);
+	fwnode_property_read_u32(fwnode, "charge-term-current-microamp",
+			     &info->charge_term_current_ua);
+	fwnode_property_read_u32(fwnode, "re-charge-voltage-microvolt",
+			     &info->charge_restart_voltage_uv);
+	fwnode_property_read_u32(fwnode, "over-voltage-threshold-microvolt",
+			     &info->overvoltage_limit_uv);
+	fwnode_property_read_u32(fwnode, "constant-charge-current-max-microamp",
+			     &info->constant_charge_current_max_ua);
+	fwnode_property_read_u32(fwnode, "constant-charge-voltage-max-microvolt",
+			     &info->constant_charge_voltage_max_uv);
+	fwnode_property_read_u32(fwnode, "factory-internal-resistance-micro-ohms",
+			     &info->factory_internal_resistance_uohm);
+
+	if (!fwnode_property_read_u32_array(fwnode, "ambient-celsius",
+					    min_max, ARRAY_SIZE(min_max))) {
+		info->temp_ambient_alert_min = min_max[0];
+		info->temp_ambient_alert_max = min_max[1];
+	}
+	if (!fwnode_property_read_u32_array(fwnode, "alert-celsius",
+					    min_max, ARRAY_SIZE(min_max))) {
+		info->temp_alert_min = min_max[0];
+		info->temp_alert_max = min_max[1];
+	}
+	if (!fwnode_property_read_u32_array(fwnode, "operating-range-celsius",
+					    min_max, ARRAY_SIZE(min_max))) {
+		info->temp_min = min_max[0];
+		info->temp_max = min_max[1];
+	}
+
+	/*
+	 * The below code uses raw of-data parsing to parse
+	 * /schemas/types.yaml#/definitions/uint32-matrix
+	 * data, so for now this is only support with of.
+	 */
+	if (!battery_np)
+		goto out_ret_pointer;
+
+	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);
+		if (!propname) {
+			power_supply_put_battery_info(psy, info);
+			err = -ENOMEM;
+			goto out_put_node;
+		}
+		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_ret_pointer;
+
+	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_ret_pointer:
+	/* Finally return the whole thing */
+	*info_out = info;
+
+out_put_node:
+	fwnode_handle_put(fwnode);
+	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);
+
+	devm_kfree(&psy->dev, info);
+}
+EXPORT_SYMBOL_GPL(power_supply_put_battery_info);
+
+/**
+ * power_supply_temp2resist_simple() - find the battery internal resistance
+ * percent from temperature
+ * @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, high, low;
+
+	for (i = 0; i < table_len; i++)
+		if (temp > table[i].temp)
+			break;
+
+	/* The library function will deal with high == low */
+	if (i == 0)
+		high = low = i;
+	else if (i == table_len)
+		high = low = i - 1;
+	else
+		high = (low = i) - 1;
+
+	return fixp_linear_interpolate(table[low].temp,
+				       table[low].resistance,
+				       table[high].temp,
+				       table[high].resistance,
+				       temp);
+}
+EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple);
+
+/**
+ * power_supply_vbat2ri() - find the battery internal resistance
+ * from the battery voltage
+ * @info: The battery information container
+ * @table: Pointer to battery resistance temperature table
+ * @vbat_uv: The battery voltage in microvolt
+ * @charging: If we are charging (true) or not (false)
+ *
+ * This helper function is used to look up battery internal resistance
+ * according to current battery voltage. Depending on whether the battery
+ * is currently charging or not, different resistance will be returned.
+ *
+ * Returns the internal resistance in microohm or negative error code.
+ */
+int power_supply_vbat2ri(struct power_supply_battery_info *info,
+			 int vbat_uv, bool charging)
+{
+	struct power_supply_vbat_ri_table *vbat2ri;
+	int table_len;
+	int i, high, low;
+
+	/*
+	 * If we are charging, and the battery supplies a separate table
+	 * for this state, we use that in order to compensate for the
+	 * charging voltage. Otherwise we use the main table.
+	 */
+	if (charging && info->vbat2ri_charging) {
+		vbat2ri = info->vbat2ri_charging;
+		table_len = info->vbat2ri_charging_size;
+	} else {
+		vbat2ri = info->vbat2ri_discharging;
+		table_len = info->vbat2ri_discharging_size;
+	}
+
+	/*
+	 * If no tables are specified, or if we are above the highest voltage in
+	 * the voltage table, just return the factory specified internal resistance.
+	 */
+	if (!vbat2ri || (table_len <= 0) || (vbat_uv > vbat2ri[0].vbat_uv)) {
+		if (charging && (info->factory_internal_resistance_charging_uohm > 0))
+			return info->factory_internal_resistance_charging_uohm;
+		else
+			return info->factory_internal_resistance_uohm;
+	}
+
+	/* Break loop at table_len - 1 because that is the highest index */
+	for (i = 0; i < table_len - 1; i++)
+		if (vbat_uv > vbat2ri[i].vbat_uv)
+			break;
+
+	/* The library function will deal with high == low */
+	if ((i == 0) || (i == (table_len - 1)))
+		high = i;
+	else
+		high = i - 1;
+	low = i;
+
+	return fixp_linear_interpolate(vbat2ri[low].vbat_uv,
+				       vbat2ri[low].ri_uohm,
+				       vbat2ri[high].vbat_uv,
+				       vbat2ri[high].ri_uohm,
+				       vbat_uv);
+}
+EXPORT_SYMBOL_GPL(power_supply_vbat2ri);
+
+struct power_supply_maintenance_charge_table *
+power_supply_get_maintenance_charging_setting(struct power_supply_battery_info *info,
+					      int index)
+{
+	if (index >= info->maintenance_charge_size)
+		return NULL;
+	return &info->maintenance_charge[index];
+}
+EXPORT_SYMBOL_GPL(power_supply_get_maintenance_charging_setting);
+
+/**
+ * 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, high, low;
+
+	for (i = 0; i < table_len; i++)
+		if (ocv > table[i].ocv)
+			break;
+
+	/* The library function will deal with high == low */
+	if (i == 0)
+		high = low = i;
+	else if (i == table_len)
+		high = low = i - 1;
+	else
+		high = (low = i) - 1;
+
+	return fixp_linear_interpolate(table[low].ocv,
+				       table[low].capacity,
+				       table[high].ocv,
+				       table[high].capacity,
+				       ocv);
+}
+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++) {
+		/* Out of capacity tables */
+		if (!info->ocv_table[i])
+			break;
+
+		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);
+
+bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
+				       int resistance)
+{
+	int low, high;
+
+	/* Nothing like this can be checked */
+	if (info->bti_resistance_ohm <= 0)
+		return false;
+
+	/* This will be extremely strict and unlikely to work */
+	if (info->bti_resistance_tolerance <= 0)
+		return (info->bti_resistance_ohm == resistance);
+
+	low = info->bti_resistance_ohm -
+		(info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
+	high = info->bti_resistance_ohm +
+		(info->bti_resistance_ohm * info->bti_resistance_tolerance) / 100;
+
+	return ((resistance >= low) && (resistance <= high));
+}
+EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);
+
+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 blocking_notifier_chain_register(&power_supply_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(power_supply_reg_notifier);
+
+void power_supply_unreg_notifier(struct notifier_block *nb)
+{
+	blocking_notifier_chain_unregister(&power_supply_notifier, nb);
+}
+EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);
+
+static bool psy_has_property(const struct power_supply_desc *psy_desc,
+			     enum power_supply_property psp)
+{
+	bool found = false;
+	int i;
+
+	for (i = 0; i < psy_desc->num_properties; i++) {
+		if (psy_desc->properties[i] == psp) {
+			found = true;
+			break;
+		}
+	}
+
+	return found;
+}
+
+#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 ret;
+
+	if (psy->desc->no_thermal)
+		return 0;
+
+	/* Register battery zone device psy reports temperature */
+	if (psy_has_property(psy->desc, 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);
+}
+
+#else
+static int psy_register_thermal(struct power_supply *psy)
+{
+	return 0;
+}
+
+static void psy_unregister_thermal(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 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);
+
+	if (psy_has_property(desc, 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 = 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_thermal(psy);
+register_thermal_failed:
+wakeup_init_failed:
+	device_del(dev);
+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_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");