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 | |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 23 | static int __power_supply_changed_work(struct device *dev, void *data) |
| 24 | { |
| 25 | struct power_supply *psy = (struct power_supply *)data; |
| 26 | struct power_supply *pst = dev_get_drvdata(dev); |
| 27 | int i; |
| 28 | |
| 29 | for (i = 0; i < psy->num_supplicants; i++) |
| 30 | if (!strcmp(psy->supplied_to[i], pst->name)) { |
| 31 | if (pst->external_power_changed) |
| 32 | pst->external_power_changed(pst); |
| 33 | } |
| 34 | return 0; |
| 35 | } |
| 36 | |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 37 | static void power_supply_changed_work(struct work_struct *work) |
| 38 | { |
| 39 | struct power_supply *psy = container_of(work, struct power_supply, |
| 40 | changed_work); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 41 | |
Harvey Harrison | 0cddc0a | 2008-04-29 00:58:29 -0700 | [diff] [blame] | 42 | dev_dbg(psy->dev, "%s\n", __func__); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 43 | |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 44 | class_for_each_device(power_supply_class, psy, |
| 45 | __power_supply_changed_work); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 46 | |
| 47 | power_supply_update_leds(psy); |
| 48 | |
| 49 | kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | void power_supply_changed(struct power_supply *psy) |
| 53 | { |
Harvey Harrison | 0cddc0a | 2008-04-29 00:58:29 -0700 | [diff] [blame] | 54 | dev_dbg(psy->dev, "%s\n", __func__); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 55 | |
| 56 | schedule_work(&psy->changed_work); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 57 | } |
| 58 | |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 59 | static int __power_supply_am_i_supplied(struct device *dev, void *data) |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 60 | { |
| 61 | union power_supply_propval ret = {0,}; |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 62 | struct power_supply *psy = (struct power_supply *)data; |
| 63 | struct power_supply *epsy = dev_get_drvdata(dev); |
| 64 | int i; |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 65 | |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 66 | for (i = 0; i < epsy->num_supplicants; i++) { |
| 67 | if (!strcmp(epsy->supplied_to[i], psy->name)) { |
| 68 | if (epsy->get_property(epsy, |
| 69 | POWER_SUPPLY_PROP_ONLINE, &ret)) |
| 70 | continue; |
| 71 | if (ret.intval) |
| 72 | return ret.intval; |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 73 | } |
| 74 | } |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 75 | return 0; |
| 76 | } |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 77 | |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 78 | int power_supply_am_i_supplied(struct power_supply *psy) |
| 79 | { |
| 80 | int error; |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 81 | |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 82 | error = class_for_each_device(power_supply_class, psy, |
| 83 | __power_supply_am_i_supplied); |
| 84 | |
Harvey Harrison | 0cddc0a | 2008-04-29 00:58:29 -0700 | [diff] [blame] | 85 | dev_dbg(psy->dev, "%s %d\n", __func__, error); |
Dave Young | 443cad9 | 2008-01-22 13:58:22 +0800 | [diff] [blame] | 86 | |
| 87 | return error; |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 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); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | static int __init power_supply_class_init(void) |
| 135 | { |
| 136 | power_supply_class = class_create(THIS_MODULE, "power_supply"); |
| 137 | |
| 138 | if (IS_ERR(power_supply_class)) |
| 139 | return PTR_ERR(power_supply_class); |
| 140 | |
| 141 | power_supply_class->dev_uevent = power_supply_uevent; |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static void __exit power_supply_class_exit(void) |
| 147 | { |
| 148 | class_destroy(power_supply_class); |
Anton Vorontsov | 4a11b59 | 2007-05-04 00:27:45 +0400 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | EXPORT_SYMBOL_GPL(power_supply_changed); |
| 152 | EXPORT_SYMBOL_GPL(power_supply_am_i_supplied); |
| 153 | EXPORT_SYMBOL_GPL(power_supply_register); |
| 154 | EXPORT_SYMBOL_GPL(power_supply_unregister); |
| 155 | |
| 156 | /* exported for the APM Power driver, APM emulation */ |
| 157 | EXPORT_SYMBOL_GPL(power_supply_class); |
| 158 | |
| 159 | subsys_initcall(power_supply_class_init); |
| 160 | module_exit(power_supply_class_exit); |
| 161 | |
| 162 | MODULE_DESCRIPTION("Universal power supply monitor class"); |
| 163 | MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, " |
| 164 | "Szabolcs Gyurko, " |
| 165 | "Anton Vorontsov <cbou@mail.ru>"); |
| 166 | MODULE_LICENSE("GPL"); |