2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/dmi.h>
32 #include <linux/delay.h>
33 #include <linux/platform_device.h>
34 #include <linux/power_supply.h>
35 #include <linux/acpi.h>
38 #define PREFIX "ACPI: "
40 #define ACPI_AC_CLASS "ac_adapter"
41 #define ACPI_AC_DEVICE_NAME "AC Adapter"
42 #define ACPI_AC_FILE_STATE "state"
43 #define ACPI_AC_NOTIFY_STATUS 0x80
44 #define ACPI_AC_STATUS_OFFLINE 0x00
45 #define ACPI_AC_STATUS_ONLINE 0x01
46 #define ACPI_AC_STATUS_UNKNOWN 0xFF
48 #define _COMPONENT ACPI_AC_COMPONENT
49 ACPI_MODULE_NAME("ac");
51 MODULE_AUTHOR("Paul Diefenbaugh");
52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53 MODULE_LICENSE("GPL");
55 static int ac_sleep_before_get_state_ms;
58 struct power_supply charger;
59 struct platform_device *pdev;
60 unsigned long long state;
61 struct notifier_block battery_nb;
64 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
66 /* --------------------------------------------------------------------------
68 -------------------------------------------------------------------------- */
70 static int acpi_ac_get_state(struct acpi_ac *ac)
73 acpi_handle handle = ACPI_HANDLE(&ac->pdev->dev);
75 status = acpi_evaluate_integer(handle, "_PSR", NULL,
77 if (ACPI_FAILURE(status)) {
78 ACPI_EXCEPTION((AE_INFO, status,
79 "Error reading AC Adapter state"));
80 ac->state = ACPI_AC_STATUS_UNKNOWN;
87 /* --------------------------------------------------------------------------
89 -------------------------------------------------------------------------- */
90 static int get_ac_property(struct power_supply *psy,
91 enum power_supply_property psp,
92 union power_supply_propval *val)
94 struct acpi_ac *ac = to_acpi_ac(psy);
99 if (acpi_ac_get_state(ac))
103 case POWER_SUPPLY_PROP_ONLINE:
104 val->intval = ac->state;
112 static enum power_supply_property ac_props[] = {
113 POWER_SUPPLY_PROP_ONLINE,
116 /* --------------------------------------------------------------------------
118 -------------------------------------------------------------------------- */
120 static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
122 struct acpi_ac *ac = data;
123 struct acpi_device *adev;
130 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
131 "Unsupported event [0x%x]\n", event));
132 case ACPI_AC_NOTIFY_STATUS:
133 case ACPI_NOTIFY_BUS_CHECK:
134 case ACPI_NOTIFY_DEVICE_CHECK:
136 * A buggy BIOS may notify AC first and then sleep for
137 * a specific time before doing actual operations in the
138 * EC event handler (_Qxx). This will cause the AC state
139 * reported by the ACPI event to be incorrect, so wait for a
140 * specific time for the EC event handler to make progress.
142 if (ac_sleep_before_get_state_ms > 0)
143 msleep(ac_sleep_before_get_state_ms);
145 acpi_ac_get_state(ac);
146 adev = ACPI_COMPANION(&ac->pdev->dev);
147 acpi_bus_generate_netlink_event(adev->pnp.device_class,
148 dev_name(&ac->pdev->dev),
149 event, (u32) ac->state);
150 acpi_notifier_call_chain(adev, event, (u32) ac->state);
151 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
157 static int acpi_ac_battery_notify(struct notifier_block *nb,
158 unsigned long action, void *data)
160 struct acpi_ac *ac = container_of(nb, struct acpi_ac, battery_nb);
161 struct acpi_bus_event *event = (struct acpi_bus_event *)data;
164 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
165 * when adapter is plugged/unplugged. However, battery status
166 * notifcations are triggered when battery starts charging or
167 * discharging. Re-reading AC status triggers lost AC notifications,
168 * if AC status has changed.
170 if (strcmp(event->device_class, ACPI_BATTERY_CLASS) == 0 &&
171 event->type == ACPI_BATTERY_NOTIFY_STATUS)
172 acpi_ac_get_state(ac);
177 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
179 ac_sleep_before_get_state_ms = 1000;
183 static struct dmi_system_id ac_dmi_table[] = {
185 .callback = thinkpad_e530_quirk,
186 .ident = "thinkpad e530",
188 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
189 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
195 static int acpi_ac_probe(struct platform_device *pdev)
198 struct acpi_ac *ac = NULL;
199 struct acpi_device *adev;
204 adev = ACPI_COMPANION(&pdev->dev);
208 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
212 strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
213 strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
215 platform_set_drvdata(pdev, ac);
217 result = acpi_ac_get_state(ac);
221 ac->charger.name = acpi_device_bid(adev);
222 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
223 ac->charger.properties = ac_props;
224 ac->charger.num_properties = ARRAY_SIZE(ac_props);
225 ac->charger.get_property = get_ac_property;
226 result = power_supply_register(&pdev->dev, &ac->charger);
230 result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
231 ACPI_ALL_NOTIFY, acpi_ac_notify_handler, ac);
233 power_supply_unregister(&ac->charger);
236 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
237 acpi_device_name(adev), acpi_device_bid(adev),
238 ac->state ? "on-line" : "off-line");
240 ac->battery_nb.notifier_call = acpi_ac_battery_notify;
241 register_acpi_notifier(&ac->battery_nb);
246 dmi_check_system(ac_dmi_table);
250 #ifdef CONFIG_PM_SLEEP
251 static int acpi_ac_resume(struct device *dev)
259 ac = platform_get_drvdata(to_platform_device(dev));
263 old_state = ac->state;
264 if (acpi_ac_get_state(ac))
266 if (old_state != ac->state)
267 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
271 #define acpi_ac_resume NULL
273 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
275 static int acpi_ac_remove(struct platform_device *pdev)
282 acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
283 ACPI_ALL_NOTIFY, acpi_ac_notify_handler);
285 ac = platform_get_drvdata(pdev);
287 power_supply_unregister(&ac->charger);
288 unregister_acpi_notifier(&ac->battery_nb);
295 static const struct acpi_device_id acpi_ac_match[] = {
299 MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
301 static struct platform_driver acpi_ac_driver = {
302 .probe = acpi_ac_probe,
303 .remove = acpi_ac_remove,
306 .owner = THIS_MODULE,
307 .pm = &acpi_ac_pm_ops,
308 .acpi_match_table = ACPI_PTR(acpi_ac_match),
312 static int __init acpi_ac_init(void)
319 result = platform_driver_register(&acpi_ac_driver);
326 static void __exit acpi_ac_exit(void)
328 platform_driver_unregister(&acpi_ac_driver);
330 module_init(acpi_ac_init);
331 module_exit(acpi_ac_exit);