diff options
Diffstat (limited to 'drivers/power/power_supply_core.c')
| -rw-r--r-- | drivers/power/power_supply_core.c | 353 |
1 files changed, 294 insertions, 59 deletions
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c index 694e8cddd5c1..2ed4a4a6b3c5 100644 --- a/drivers/power/power_supply_core.c +++ b/drivers/power/power_supply_core.c @@ -40,16 +40,16 @@ static bool __power_supply_is_supplied_by(struct power_supply *supplier, /* 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; } @@ -62,8 +62,8 @@ static int __power_supply_changed_work(struct device *dev, void *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; @@ -75,7 +75,7 @@ static void power_supply_changed_work(struct work_struct *work) 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); /* @@ -93,7 +93,7 @@ static void power_supply_changed_work(struct work_struct *work) power_supply_update_leds(psy); atomic_notifier_call_chain(&power_supply_notifier, PSY_EVENT_PROP_CHANGED, psy); - kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE); + kobject_uevent(&psy->dev.kobj, KOBJ_CHANGE); spin_lock_irqsave(&psy->changed_lock, flags); } @@ -103,7 +103,7 @@ static void power_supply_changed_work(struct work_struct *work) * to true. */ if (likely(!psy->changed)) - pm_relax(psy->dev); + pm_relax(&psy->dev); spin_unlock_irqrestore(&psy->changed_lock, flags); } @@ -111,11 +111,11 @@ void power_supply_changed(struct power_supply *psy) { 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); } @@ -138,9 +138,9 @@ static int __power_supply_populate_supplied_from(struct device *dev, 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; @@ -158,7 +158,7 @@ static int power_supply_populate_supplied_from(struct power_supply *psy) 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; } @@ -220,7 +220,7 @@ static int power_supply_check_supplies(struct power_supply *psy) of_node_put(np); if (ret) { - dev_dbg(psy->dev, "Failed to find supply!\n"); + dev_dbg(&psy->dev, "Failed to find supply!\n"); return ret; } } while (np); @@ -230,17 +230,18 @@ static int power_supply_check_supplies(struct power_supply *psy) 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 - 1), + *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; } @@ -260,7 +261,8 @@ static int __power_supply_am_i_supplied(struct device *dev, void *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 (!epsy->desc->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, + &ret)) return ret.intval; return 0; @@ -273,7 +275,7 @@ int power_supply_am_i_supplied(struct power_supply *psy) 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; } @@ -286,8 +288,9 @@ static int __power_supply_is_system_supplied(struct device *dev, void *data) unsigned int *count = data; (*count)++; - if (psy->type != POWER_SUPPLY_TYPE_BATTERY) - if (!psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret)) + if (psy->desc->type != POWER_SUPPLY_TYPE_BATTERY) + if (!psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE, + &ret)) return ret.intval; return 0; @@ -314,8 +317,10 @@ EXPORT_SYMBOL_GPL(power_supply_is_system_supplied); 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; } @@ -328,28 +333,74 @@ static int power_supply_match_device_by_name(struct device *dev, const void *dat 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); @@ -361,21 +412,70 @@ struct power_supply *power_supply_get_by_phandle(struct device_node *np, of_node_put(power_supply_np); - 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_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) @@ -400,7 +500,7 @@ static int power_supply_read_temp(struct thermal_zone_device *tzd, 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) @@ -417,14 +517,14 @@ static int psy_register_thermal(struct power_supply *psy) { int i; - if (psy->no_thermal) + 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); + 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); } } @@ -447,7 +547,7 @@ static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd, 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; @@ -463,7 +563,7 @@ static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd, 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; @@ -480,7 +580,7 @@ static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd, 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; @@ -497,11 +597,11 @@ 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->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); return PTR_ERR_OR_ZERO(psy->tcd); } @@ -535,15 +635,21 @@ static void psy_unregister_cooler(struct power_supply *psy) } #endif -static int __power_supply_register(struct device *parent, - struct power_supply *psy, bool ws) +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; + psy = kzalloc(sizeof(*psy), GFP_KERNEL); + if (!psy) + return ERR_PTR(-ENOMEM); + + dev = &psy->dev; device_initialize(dev); @@ -552,9 +658,16 @@ static int __power_supply_register(struct device *parent, dev->parent = parent; dev->release = power_supply_dev_release; dev_set_drvdata(dev, psy); - psy->dev = dev; + psy->desc = desc; + atomic_inc(&psy->use_cnt); + 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", psy->name); + rc = dev_set_name(dev, "%s", desc->name); if (rc) goto dev_set_name_failed; @@ -589,7 +702,7 @@ static int __power_supply_register(struct device *parent, power_supply_changed(psy); - return 0; + return psy; create_triggers_failed: psy_unregister_cooler(psy); @@ -602,33 +715,155 @@ wakeup_init_failed: check_supplies_failed: dev_set_name_failed: put_device(dev); - return rc; + return ERR_PTR(rc); } -int power_supply_register(struct device *parent, struct power_supply *psy) +/** + * power_supply_register() - Register new power supply + * @parent: Device to be a parent of power supply's device + * @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, psy, true); + return __power_supply_register(parent, desc, cfg, true); } EXPORT_SYMBOL_GPL(power_supply_register); -int power_supply_register_no_ws(struct device *parent, struct power_supply *psy) +/** + * power_supply_register() - Register new non-waking-source power supply + * @parent: Device to be a parent of power supply's device + * @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, psy, false); + 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); +} + +/** + * power_supply_register() - Register managed power supply + * @parent: Device to be a parent of power supply's device + * @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); + +/** + * power_supply_register() - Register managed non-waking-source power supply + * @parent: Device to be a parent of power supply's device + * @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"); + sysfs_remove_link(&psy->dev.kobj, "powers"); power_supply_remove_triggers(psy); psy_unregister_cooler(psy); psy_unregister_thermal(psy); - device_init_wakeup(psy->dev, false); - 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"); |