Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 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); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 49 | } |
| 50 | |
| 51 | void power_supply_changed(struct power_supply *psy) |
| 52 | { |
| 53 | dev_dbg(psy->dev, "%s\n", __FUNCTION__); |
| 54 | |
| 55 | schedule_work(&psy->changed_work); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | int power_supply_am_i_supplied(struct power_supply *psy) |
| 59 | { |
| 60 | union power_supply_propval ret = {0,}; |
| 61 | struct device *dev; |
| 62 | |
| 63 | down(&power_supply_class->sem); |
| 64 | list_for_each_entry(dev, &power_supply_class->devices, node) { |
| 65 | struct power_supply *epsy = dev_get_drvdata(dev); |
| 66 | int i; |
| 67 | |
| 68 | for (i = 0; i < epsy->num_supplicants; i++) { |
| 69 | if (!strcmp(epsy->supplied_to[i], psy->name)) { |
| 70 | if (epsy->get_property(epsy, |
| 71 | POWER_SUPPLY_PROP_ONLINE, &ret)) |
| 72 | continue; |
| 73 | if (ret.intval) |
| 74 | goto out; |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | out: |
| 79 | up(&power_supply_class->sem); |
| 80 | |
| 81 | dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval); |
| 82 | |
| 83 | return ret.intval; |
| 84 | } |
| 85 | |
| 86 | int power_supply_register(struct device *parent, struct power_supply *psy) |
| 87 | { |
| 88 | int rc = 0; |
| 89 | |
| 90 | psy->dev = device_create(power_supply_class, parent, 0, |
| 91 | "%s", psy->name); |
| 92 | if (IS_ERR(psy->dev)) { |
| 93 | rc = PTR_ERR(psy->dev); |
| 94 | goto dev_create_failed; |
| 95 | } |
| 96 | |
| 97 | dev_set_drvdata(psy->dev, psy); |
| 98 | |
| 99 | INIT_WORK(&psy->changed_work, power_supply_changed_work); |
| 100 | |
| 101 | rc = power_supply_create_attrs(psy); |
| 102 | if (rc) |
| 103 | goto create_attrs_failed; |
| 104 | |
| 105 | rc = power_supply_create_triggers(psy); |
| 106 | if (rc) |
| 107 | goto create_triggers_failed; |
| 108 | |
| 109 | power_supply_changed(psy); |
| 110 | |
| 111 | goto success; |
| 112 | |
| 113 | create_triggers_failed: |
| 114 | power_supply_remove_attrs(psy); |
| 115 | create_attrs_failed: |
| 116 | device_unregister(psy->dev); |
| 117 | dev_create_failed: |
| 118 | success: |
| 119 | return rc; |
| 120 | } |
| 121 | |
| 122 | void power_supply_unregister(struct power_supply *psy) |
| 123 | { |
| 124 | flush_scheduled_work(); |
| 125 | power_supply_remove_triggers(psy); |
| 126 | power_supply_remove_attrs(psy); |
| 127 | device_unregister(psy->dev); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | static int __init power_supply_class_init(void) |
| 131 | { |
| 132 | power_supply_class = class_create(THIS_MODULE, "power_supply"); |
| 133 | |
| 134 | if (IS_ERR(power_supply_class)) |
| 135 | return PTR_ERR(power_supply_class); |
| 136 | |
| 137 | power_supply_class->dev_uevent = power_supply_uevent; |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | static void __exit power_supply_class_exit(void) |
| 143 | { |
| 144 | class_destroy(power_supply_class); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | EXPORT_SYMBOL_GPL(power_supply_changed); |
| 148 | EXPORT_SYMBOL_GPL(power_supply_am_i_supplied); |
| 149 | EXPORT_SYMBOL_GPL(power_supply_register); |
| 150 | EXPORT_SYMBOL_GPL(power_supply_unregister); |
| 151 | |
| 152 | /* exported for the APM Power driver, APM emulation */ |
| 153 | EXPORT_SYMBOL_GPL(power_supply_class); |
| 154 | |
| 155 | subsys_initcall(power_supply_class_init); |
| 156 | module_exit(power_supply_class_exit); |
| 157 | |
| 158 | MODULE_DESCRIPTION("Universal power supply monitor class"); |
| 159 | MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, " |
| 160 | "Szabolcs Gyurko, " |
| 161 | "Anton Vorontsov <cbou@mail.ru>"); |
| 162 | MODULE_LICENSE("GPL"); |