#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
+#include <linux/notifier.h>
#include <linux/err.h>
#include <linux/power_supply.h>
#include <linux/thermal.h>
struct class *power_supply_class;
EXPORT_SYMBOL_GPL(power_supply_class);
+ATOMIC_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)
{
/* Support both supplied_to and supplied_from modes */
if (supply->supplied_from) {
- if (!supplier->name)
+ if (!supplier->desc->name)
return false;
for (i = 0; i < supply->num_supplies; i++)
- if (!strcmp(supplier->name, supply->supplied_from[i]))
+ if (!strcmp(supplier->desc->name, supply->supplied_from[i]))
return true;
} else {
- if (!supply->name)
+ if (!supply->desc->name)
return false;
for (i = 0; i < supplier->num_supplicants; i++)
- if (!strcmp(supplier->supplied_to[i], supply->name))
+ if (!strcmp(supplier->supplied_to[i], supply->desc->name))
return true;
}
static int __power_supply_changed_work(struct device *dev, void *data)
{
- struct power_supply *psy = (struct power_supply *)data;
+ struct power_supply *psy = data;
struct power_supply *pst = dev_get_drvdata(dev);
if (__power_supply_is_supplied_by(psy, pst)) {
- if (pst->external_power_changed)
- pst->external_power_changed(pst);
+ if (pst->desc->external_power_changed)
+ pst->desc->external_power_changed(pst);
}
return 0;
struct power_supply *psy = container_of(work, struct power_supply,
changed_work);
- dev_dbg(psy->dev, "%s\n", __func__);
+ dev_dbg(&psy->dev, "%s\n", __func__);
spin_lock_irqsave(&psy->changed_lock, flags);
- if (psy->changed) {
+ /*
+ * 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);
-
- kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
+ atomic_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);
}
- if (!psy->changed)
- pm_relax(psy->dev);
+
+ /*
+ * 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);
}
{
unsigned long flags;
- dev_dbg(psy->dev, "%s\n", __func__);
+ dev_dbg(&psy->dev, "%s\n", __func__);
spin_lock_irqsave(&psy->changed_lock, flags);
psy->changed = true;
- pm_stay_awake(psy->dev);
+ 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)
+ mutex_lock(&psy->dev.parent->mutex);
+
+ power_supply_changed(psy);
+
+ if (psy->dev.parent)
+ mutex_unlock(&psy->dev.parent->mutex);
+}
+
#ifdef CONFIG_OF
#include <linux/of.h>
static int __power_supply_populate_supplied_from(struct device *dev,
void *data)
{
- struct power_supply *psy = (struct power_supply *)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)
- continue;
+ break;
if (np == epsy->of_node) {
- dev_info(psy->dev, "%s: Found supply : %s\n",
- psy->name, epsy->name);
- psy->supplied_from[i-1] = (char *)epsy->name;
+ dev_info(&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;
error = class_for_each_device(power_supply_class, NULL, psy,
__power_supply_populate_supplied_from);
- dev_dbg(psy->dev, "%s %d\n", __func__, error);
+ 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 = (struct device_node *)data;
+ struct device_node *np = data;
struct power_supply *epsy = dev_get_drvdata(dev);
- /* return error breaks out of class_for_each_device loop */
+ /* returning non-zero breaks out of class_for_each_device loop */
if (epsy->of_node == np)
- return -EINVAL;
+ return 1;
return 0;
}
static int power_supply_find_supply_from_node(struct device_node *supply_node)
{
int error;
- struct device *dev;
- struct class_dev_iter iter;
/*
- * Use iterator to see if any other device is registered.
- * This is required since class_for_each_device returns 0
- * if there are no devices registered.
- */
- class_dev_iter_init(&iter, power_supply_class, NULL, NULL);
- dev = class_dev_iter_next(&iter);
-
- if (!dev)
- return -EPROBE_DEFER;
-
- /*
- * We have to treat the return value as inverted, because if
- * we return error on not found, then it won't continue looking.
- * So we trick it by returning error on success to stop looking
- * once the matching device is found.
+ * 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 ? 0 : -EPROBE_DEFER;
+ return error ? (error == 1 ? 0 : error) : -EPROBE_DEFER;
}
static int power_supply_check_supplies(struct power_supply *psy)
np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
if (!np)
- continue;
+ break;
ret = power_supply_find_supply_from_node(np);
+ of_node_put(np);
+
if (ret) {
- dev_dbg(psy->dev, "Failed to find supply, defer!\n");
- return -EPROBE_DEFER;
+ 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),
+ psy->supplied_from = devm_kzalloc(&psy->dev, sizeof(psy->supplied_from),
GFP_KERNEL);
if (!psy->supplied_from) {
- dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
+ dev_err(&psy->dev, "Couldn't allocate memory for supply list\n");
return -ENOMEM;
}
- *psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char *) * cnt,
+ *psy->supplied_from = devm_kzalloc(&psy->dev,
+ sizeof(char *) * (cnt - 1),
GFP_KERNEL);
if (!*psy->supplied_from) {
- dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
+ dev_err(&psy->dev, "Couldn't allocate memory for supply list\n");
return -ENOMEM;
}
static int __power_supply_am_i_supplied(struct device *dev, void *data)
{
union power_supply_propval ret = {0,};
- struct power_supply *psy = (struct power_supply *)data;
+ struct power_supply *psy = data;
struct power_supply *epsy = dev_get_drvdata(dev);
if (__power_supply_is_supplied_by(epsy, psy))
- if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) {
- if (ret.intval)
- return ret.intval;
- }
+ if (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE,
+ &ret))
+ return ret.intval;
return 0;
}
error = class_for_each_device(power_supply_class, NULL, psy,
__power_supply_am_i_supplied);
- dev_dbg(psy->dev, "%s %d\n", __func__, error);
+ dev_dbg(&psy->dev, "%s %d\n", __func__, error);
return error;
}
unsigned int *count = data;
(*count)++;
- if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
- if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
- return 0;
- if (ret.intval)
+ 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_set_battery_charged(struct power_supply *psy)
{
- if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
- psy->set_charged(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;
}
const char *name = data;
struct power_supply *psy = dev_get_drvdata(dev);
- return strcmp(psy->name, name) == 0;
+ 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);
- return dev ? dev_get_drvdata(dev) : NULL;
+ 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
+ * @phandle_name: 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
+ * @phandle_name: 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_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ if (atomic_read(&psy->use_cnt) <= 0)
+ 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");
+ 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 = container_of(dev, struct power_supply, dev);
pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
- kfree(dev);
+ 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,
- unsigned long *temp)
+ int *temp)
{
struct power_supply *psy;
union power_supply_propval val;
WARN_ON(tzd == NULL);
psy = tzd->devdata;
- ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
+ ret = psy->desc->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
/* Convert tenths of degree Celsius to milli degree Celsius. */
if (!ret)
{
int i;
+ if (psy->desc->no_thermal)
+ return 0;
+
/* Register battery zone device psy reports temperature */
- for (i = 0; i < psy->num_properties; i++) {
- if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
- psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
- psy, &psy_tzd_ops, NULL, 0, 0);
- if (IS_ERR(psy->tzd))
- return PTR_ERR(psy->tzd);
- break;
+ 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);
+ return PTR_ERR_OR_ZERO(psy->tzd);
}
}
return 0;
int ret;
psy = tcd->devdata;
- ret = psy->get_property(psy,
+ ret = psy->desc->get_property(psy,
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
if (!ret)
*state = val.intval;
int ret;
psy = tcd->devdata;
- ret = psy->get_property(psy,
+ ret = psy->desc->get_property(psy,
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
if (!ret)
*state = val.intval;
psy = tcd->devdata;
val.intval = state;
- ret = psy->set_property(psy,
+ ret = psy->desc->set_property(psy,
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
return ret;
int i;
/* Register for cooling device if psy can control charging */
- for (i = 0; i < psy->num_properties; i++) {
- if (psy->properties[i] ==
+ 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->name,
+ (char *)psy->desc->name,
psy, &psy_tcd_ops);
- if (IS_ERR(psy->tcd))
- return PTR_ERR(psy->tcd);
- break;
+ return PTR_ERR_OR_ZERO(psy->tcd);
}
}
return 0;
}
#endif
-int power_supply_register(struct device *parent, struct power_supply *psy)
+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;
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev)
- return -ENOMEM;
+ if (!parent)
+ pr_warn("%s: Expected proper parent device for '%s'\n",
+ __func__, desc->name);
+
+ psy = kzalloc(sizeof(*psy), GFP_KERNEL);
+ if (!psy)
+ return ERR_PTR(-ENOMEM);
+
+ dev = &psy->dev;
device_initialize(dev);
dev->parent = parent;
dev->release = power_supply_dev_release;
dev_set_drvdata(dev, psy);
- psy->dev = dev;
+ psy->desc = desc;
+ if (cfg) {
+ psy->drv_data = cfg->drv_data;
+ psy->of_node = 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) {
goto check_supplies_failed;
}
- rc = kobject_set_name(&dev->kobj, "%s", psy->name);
+ spin_lock_init(&psy->changed_lock);
+ rc = device_init_wakeup(dev, ws);
if (rc)
- goto kobject_set_name_failed;
+ goto wakeup_init_failed;
rc = device_add(dev);
if (rc)
goto device_add_failed;
- spin_lock_init(&psy->changed_lock);
- rc = device_init_wakeup(dev, true);
- if (rc)
- goto wakeup_init_failed;
-
rc = psy_register_thermal(psy);
if (rc)
goto register_thermal_failed;
if (rc)
goto create_triggers_failed;
- power_supply_changed(psy);
+ /*
+ * 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);
+
+ queue_delayed_work(system_power_efficient_wq,
+ &psy->deferred_register_work,
+ POWER_SUPPLY_DEFERRED_REGISTER_TIME);
- goto success;
+ return psy;
create_triggers_failed:
psy_unregister_cooler(psy);
register_cooler_failed:
psy_unregister_thermal(psy);
register_thermal_failed:
-wakeup_init_failed:
device_del(dev);
-kobject_set_name_failed:
device_add_failed:
+wakeup_init_failed:
check_supplies_failed:
+dev_set_name_failed:
put_device(dev);
-success:
- return rc;
+ 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));
cancel_work_sync(&psy->changed_work);
- sysfs_remove_link(&psy->dev->kobj, "powers");
+ cancel_delayed_work_sync(&psy->deferred_register_work);
+ sysfs_remove_link(&psy->dev.kobj, "powers");
power_supply_remove_triggers(psy);
psy_unregister_cooler(psy);
psy_unregister_thermal(psy);
- device_unregister(psy->dev);
+ 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");
projects / firefly-linux-kernel-4.4.55.git / blobdiff