/* * 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/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); 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 = (struct power_supply *)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); if (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); spin_lock_irqsave(&psy->changed_lock, flags); } /* * Dependent power supplies (e.g. battery) may have changed state * as a result of this event, so poll again and hold the * wakeup_source until all events are processed. */ if (!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 = (struct power_supply *)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; 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 = (struct device_node *)data; struct power_supply *epsy = dev_get_drvdata(dev); /* return error breaks out of class_for_each_device loop */ if (epsy->of_node == np) return -EINVAL; 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. */ error = class_for_each_device(power_supply_class, NULL, supply_node, __power_supply_find_supply_from_node); return error ? 0 : -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) continue; ret = power_supply_find_supply_from_node(np); if (ret) { dev_dbg(psy->dev, "Failed to find supply, defer!\n"); of_node_put(np); return -EPROBE_DEFER; } of_node_put(np); } while (np); /* 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, 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 = (struct power_supply *)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; } 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 0; if (ret.intval) 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 (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); 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); } #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; /* 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; } } 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); if (IS_ERR(psy->tcd)) return PTR_ERR(psy->tcd); break; } } 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 int power_supply_register(struct device *parent, struct power_supply *psy) { 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; 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, true); if (rc) goto wakeup_init_failed; rc = kobject_set_name(&dev->kobj, "%s", psy->name); if (rc) goto kobject_set_name_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); goto success; 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: check_supplies_failed: put_device(dev); success: return rc; } EXPORT_SYMBOL_GPL(power_supply_register); void power_supply_unregister(struct power_supply *psy) { 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); 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");