| /* |
| * 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 |
| * |
| * You may use this code as per GPL version 2 |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #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> |
| #include "power_supply.h" |
| |
| /* exported for the APM Power driver, APM emulation */ |
| 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; |
| |
| 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->name) |
| return false; |
| for (i = 0; i < supply->num_supplies; i++) |
| if (!strcmp(supplier->name, supply->supplied_from[i])) |
| return true; |
| } else { |
| if (!supply->name) |
| return false; |
| for (i = 0; i < supplier->num_supplicants; i++) |
| if (!strcmp(supplier->supplied_to[i], supply->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->external_power_changed) |
| pst->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); |
| 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); |
| } |
| |
| /* |
| * 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); |
| |
| #ifdef CONFIG_OF |
| #include <linux/of.h> |
| |
| 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_info(psy->dev, "%s: Found supply : %s\n", |
| psy->name, epsy->name); |
| psy->supplied_from[i-1] = (char *)epsy->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) { |
| 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), |
| GFP_KERNEL); |
| if (!*psy->supplied_from) { |
| dev_err(psy->dev, "Couldn't allocate memory for supply list\n"); |
| return -ENOMEM; |
| } |
| |
| return power_supply_populate_supplied_from(psy); |
| } |
| #else |
| static inline int power_supply_check_supplies(struct power_supply *psy) |
| { |
| return 0; |
| } |
| #endif |
| |
| static int __power_supply_am_i_supplied(struct device *dev, void *data) |
| { |
| union power_supply_propval ret = {0,}; |
| 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)) |
| return ret.intval; |
| |
| return 0; |
| } |
| |
| int power_supply_am_i_supplied(struct power_supply *psy) |
| { |
| int error; |
| |
| error = class_for_each_device(power_supply_class, NULL, psy, |
| __power_supply_am_i_supplied); |
| |
| dev_dbg(psy->dev, "%s %d\n", __func__, error); |
| |
| 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; |
| |
| (*count)++; |
| if (psy->type != POWER_SUPPLY_TYPE_BATTERY) |
| if (!psy->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 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); |
| |
| int power_supply_set_battery_charged(struct power_supply *psy) |
| { |
| if (atomic_read(&psy->use_cnt) >= 0 && |
| psy->type == POWER_SUPPLY_TYPE_BATTERY && |
| psy->set_charged) { |
| psy->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->name, name) == 0; |
| } |
| |
| struct power_supply *power_supply_get_by_name(const char *name) |
| { |
| struct device *dev = class_find_device(power_supply_class, NULL, name, |
| power_supply_match_device_by_name); |
| |
| return dev ? dev_get_drvdata(dev) : NULL; |
| } |
| EXPORT_SYMBOL_GPL(power_supply_get_by_name); |
| |
| #ifdef CONFIG_OF |
| static int power_supply_match_device_node(struct device *dev, const void *data) |
| { |
| return dev->parent && dev->parent->of_node == data; |
| } |
| |
| struct power_supply *power_supply_get_by_phandle(struct device_node *np, |
| const char *property) |
| { |
| struct device_node *power_supply_np; |
| 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); |
| |
| return dev ? dev_get_drvdata(dev) : NULL; |
| } |
| 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->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->set_property) |
| return -ENODEV; |
| |
| return psy->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->property_is_writeable) |
| return -ENODEV; |
| |
| return psy->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->external_power_changed) |
| return; |
| |
| psy->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) |
| { |
| pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| kfree(dev); |
| } |
| |
| 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) |
| { |
| struct power_supply *psy; |
| union power_supply_propval val; |
| int ret; |
| |
| WARN_ON(tzd == NULL); |
| psy = tzd->devdata; |
| ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val); |
| |
| /* Convert tenths of degree Celsius to milli degree Celsius. */ |
| if (!ret) |
| *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; |
| |
| if (psy->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); |
| return PTR_ERR_OR_ZERO(psy->tzd); |
| } |
| } |
| 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 = psy->get_property(psy, |
| POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val); |
| if (!ret) |
| *state = val.intval; |
| |
| return ret; |
| } |
| |
| static int ps_get_cur_chrage_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 = psy->get_property(psy, |
| POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val); |
| if (!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->set_property(psy, |
| POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val); |
| |
| return ret; |
| } |
| |
| static struct thermal_cooling_device_ops psy_tcd_ops = { |
| .get_max_state = ps_get_max_charge_cntl_limit, |
| .get_cur_state = ps_get_cur_chrage_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->num_properties; i++) { |
| if (psy->properties[i] == |
| POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) { |
| psy->tcd = thermal_cooling_device_register( |
| (char *)psy->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 int __power_supply_register(struct device *parent, |
| struct power_supply *psy, |
| const struct power_supply_config *cfg, |
| bool ws) |
| { |
| struct device *dev; |
| int rc; |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return -ENOMEM; |
| |
| 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->dev = dev; |
| 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); |
| if (rc) |
| goto dev_set_name_failed; |
| |
| INIT_WORK(&psy->changed_work, power_supply_changed_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_init_wakeup(dev, ws); |
| if (rc) |
| goto wakeup_init_failed; |
| |
| rc = device_add(dev); |
| if (rc) |
| goto device_add_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; |
| |
| power_supply_changed(psy); |
| |
| return 0; |
| |
| create_triggers_failed: |
| psy_unregister_cooler(psy); |
| register_cooler_failed: |
| psy_unregister_thermal(psy); |
| register_thermal_failed: |
| device_del(dev); |
| device_add_failed: |
| wakeup_init_failed: |
| check_supplies_failed: |
| dev_set_name_failed: |
| put_device(dev); |
| return rc; |
| } |
| |
| int power_supply_register(struct device *parent, struct power_supply *psy, |
| const struct power_supply_config *cfg) |
| { |
| return __power_supply_register(parent, psy, cfg, true); |
| } |
| EXPORT_SYMBOL_GPL(power_supply_register); |
| |
| int power_supply_register_no_ws(struct device *parent, struct power_supply *psy, |
| const struct power_supply_config *cfg) |
| { |
| return __power_supply_register(parent, psy, 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); |
| } |
| |
| int devm_power_supply_register(struct device *parent, struct power_supply *psy, |
| const struct power_supply_config *cfg) |
| { |
| struct power_supply **ptr = devres_alloc(devm_power_supply_release, |
| sizeof(*ptr), GFP_KERNEL); |
| int ret; |
| |
| if (!ptr) |
| return -ENOMEM; |
| ret = __power_supply_register(parent, psy, cfg, true); |
| if (ret < 0) |
| devres_free(ptr); |
| else { |
| *ptr = psy; |
| devres_add(parent, ptr); |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(devm_power_supply_register); |
| |
| int devm_power_supply_register_no_ws(struct device *parent, struct power_supply *psy, |
| const struct power_supply_config *cfg) |
| { |
| struct power_supply **ptr = devres_alloc(devm_power_supply_release, |
| sizeof(*ptr), GFP_KERNEL); |
| int ret; |
| |
| if (!ptr) |
| return -ENOMEM; |
| ret = __power_supply_register(parent, psy, cfg, false); |
| if (ret < 0) |
| devres_free(ptr); |
| else { |
| *ptr = psy; |
| devres_add(parent, ptr); |
| } |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(devm_power_supply_register_no_ws); |
| |
| 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"); |
| power_supply_remove_triggers(psy); |
| psy_unregister_cooler(psy); |
| psy_unregister_thermal(psy); |
| device_init_wakeup(psy->dev, false); |
| device_unregister(psy->dev); |
| } |
| EXPORT_SYMBOL_GPL(power_supply_unregister); |
| |
| void *power_supply_get_drvdata(struct power_supply *psy) |
| { |
| return psy->drv_data; |
| } |
| EXPORT_SYMBOL_GPL(power_supply_get_drvdata); |
| |
| static int __init power_supply_class_init(void) |
| { |
| power_supply_class = class_create(THIS_MODULE, "power_supply"); |
| |
| if (IS_ERR(power_supply_class)) |
| return PTR_ERR(power_supply_class); |
| |
| power_supply_class->dev_uevent = power_supply_uevent; |
| power_supply_init_attrs(&power_supply_dev_type); |
| |
| return 0; |
| } |
| |
| static void __exit power_supply_class_exit(void) |
| { |
| class_destroy(power_supply_class); |
| } |
| |
| subsys_initcall(power_supply_class_init); |
| module_exit(power_supply_class_exit); |
| |
| MODULE_DESCRIPTION("Universal power supply monitor class"); |
| MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, " |
| "Szabolcs Gyurko, " |
| "Anton Vorontsov <cbou@mail.ru>"); |
| MODULE_LICENSE("GPL"); |