projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 4a11b59d AV |
1 | /* |
| 2 | * Universal power supply monitor class | |
| 3 | * | |
| 4 | * Copyright © 2007 Anton Vorontsov <cbou@mail.ru> | |
| 5 | * Copyright © 2004 Szabolcs Gyurko | |
| 6 | * Copyright © 2003 Ian Molton <spyro@f2s.com> | |
| 7 | * | |
| 8 | * Modified: 2004, Oct Szabolcs Gyurko | |
| 9 | * | |
| 10 | * You may use this code as per GPL version 2 | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/types.h> | |
| 15 | #include <linux/init.h> | |
| 16 | #include <linux/device.h> | |
| 17 | #include <linux/err.h> | |
| 18 | #include <linux/power_supply.h> | |
| 19 | #include "power_supply.h" | |
| 20 | ||
| 21 | struct class *power_supply_class; | |
| 22 | ||
| 23 | static void power_supply_changed_work(struct work_struct *work) | |
| 24 | { | |
| 25 | struct power_supply *psy = container_of(work, struct power_supply, | |
| 26 | changed_work); | |
| 27 | int i; | |
| 28 | ||
| 29 | dev_dbg(psy->dev, "%s\n", __FUNCTION__); | |
| 30 | ||
| 31 | for (i = 0; i < psy->num_supplicants; i++) { | |
| 32 | struct device *dev; | |
| 33 | ||
| 34 | down(&power_supply_class->sem); | |
| 35 | list_for_each_entry(dev, &power_supply_class->devices, node) { | |
| 36 | struct power_supply *pst = dev_get_drvdata(dev); | |
| 37 | ||
| 38 | if (!strcmp(psy->supplied_to[i], pst->name)) { | |
| 39 | if (pst->external_power_changed) | |
| 40 | pst->external_power_changed(pst); | |
| 41 | } | |
| 42 | } | |
| 43 | up(&power_supply_class->sem); | |
| 44 | } | |
| 45 | ||
| 46 | power_supply_update_leds(psy); | |
| 47 | ||
| 48 | kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE); | |
| 49 | ||
| 50 | return; | |
| 51 | } | |
| 52 | ||
| 53 | void power_supply_changed(struct power_supply *psy) | |
| 54 | { | |
| 55 | dev_dbg(psy->dev, "%s\n", __FUNCTION__); | |
| 56 | ||
| 57 | schedule_work(&psy->changed_work); | |
| 58 | ||
| 59 | return; | |
| 60 | } | |
| 61 | ||
| 62 | int power_supply_am_i_supplied(struct power_supply *psy) | |
| 63 | { | |
| 64 | union power_supply_propval ret = {0,}; | |
| 65 | struct device *dev; | |
| 66 | ||
| 67 | down(&power_supply_class->sem); | |
| 68 | list_for_each_entry(dev, &power_supply_class->devices, node) { | |
| 69 | struct power_supply *epsy = dev_get_drvdata(dev); | |
| 70 | int i; | |
| 71 | ||
| 72 | for (i = 0; i < epsy->num_supplicants; i++) { | |
| 73 | if (!strcmp(epsy->supplied_to[i], psy->name)) { | |
| 74 | if (epsy->get_property(epsy, | |
| 75 | POWER_SUPPLY_PROP_ONLINE, &ret)) | |
| 76 | continue; | |
| 77 | if (ret.intval) | |
| 78 | goto out; | |
| 79 | } | |
| 80 | } | |
| 81 | } | |
| 82 | out: | |
| 83 | up(&power_supply_class->sem); | |
| 84 | ||
| 85 | dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval); | |
| 86 | ||
| 87 | return ret.intval; | |
| 88 | } | |
| 89 | ||
| 90 | int power_supply_register(struct device *parent, struct power_supply *psy) | |
| 91 | { | |
| 92 | int rc = 0; | |
| 93 | ||
| 94 | psy->dev = device_create(power_supply_class, parent, 0, | |
| 95 | "%s", psy->name); | |
| 96 | if (IS_ERR(psy->dev)) { | |
| 97 | rc = PTR_ERR(psy->dev); | |
| 98 | goto dev_create_failed; | |
| 99 | } | |
| 100 | ||
| 101 | dev_set_drvdata(psy->dev, psy); | |
| 102 | ||
| 103 | INIT_WORK(&psy->changed_work, power_supply_changed_work); | |
| 104 | ||
| 105 | rc = power_supply_create_attrs(psy); | |
| 106 | if (rc) | |
| 107 | goto create_attrs_failed; | |
| 108 | ||
| 109 | rc = power_supply_create_triggers(psy); | |
| 110 | if (rc) | |
| 111 | goto create_triggers_failed; | |
| 112 | ||
| 113 | power_supply_changed(psy); | |
| 114 | ||
| 115 | goto success; | |
| 116 | ||
| 117 | create_triggers_failed: | |
| 118 | power_supply_remove_attrs(psy); | |
| 119 | create_attrs_failed: | |
| 120 | device_unregister(psy->dev); | |
| 121 | dev_create_failed: | |
| 122 | success: | |
| 123 | return rc; | |
| 124 | } | |
| 125 | ||
| 126 | void power_supply_unregister(struct power_supply *psy) | |
| 127 | { | |
| 128 | flush_scheduled_work(); | |
| 129 | power_supply_remove_triggers(psy); | |
| 130 | power_supply_remove_attrs(psy); | |
| 131 | device_unregister(psy->dev); | |
| 132 | return; | |
| 133 | } | |
| 134 | ||
| 135 | static int __init power_supply_class_init(void) | |
| 136 | { | |
| 137 | power_supply_class = class_create(THIS_MODULE, "power_supply"); | |
| 138 | ||
| 139 | if (IS_ERR(power_supply_class)) | |
| 140 | return PTR_ERR(power_supply_class); | |
| 141 | ||
| 142 | power_supply_class->dev_uevent = power_supply_uevent; | |
| 143 | ||
| 144 | return 0; | |
| 145 | } | |
| 146 | ||
| 147 | static void __exit power_supply_class_exit(void) | |
| 148 | { | |
| 149 | class_destroy(power_supply_class); | |
| 150 | return; | |
| 151 | } | |
| 152 | ||
| 153 | EXPORT_SYMBOL_GPL(power_supply_changed); | |
| 154 | EXPORT_SYMBOL_GPL(power_supply_am_i_supplied); | |
| 155 | EXPORT_SYMBOL_GPL(power_supply_register); | |
| 156 | EXPORT_SYMBOL_GPL(power_supply_unregister); | |
| 157 | ||
| 158 | /* exported for the APM Power driver, APM emulation */ | |
| 159 | EXPORT_SYMBOL_GPL(power_supply_class); | |
| 160 | ||
| 161 | subsys_initcall(power_supply_class_init); | |
| 162 | module_exit(power_supply_class_exit); | |
| 163 | ||
| 164 | MODULE_DESCRIPTION("Universal power supply monitor class"); | |
| 165 | MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, " | |
| 166 | "Szabolcs Gyurko, " | |
| 167 | "Anton Vorontsov <cbou@mail.ru>"); | |
| 168 | MODULE_LICENSE("GPL"); |