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 <acpi/acpi_bus.h>
36 #include <acpi/acpi_drivers.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 acpi_device *adev;
60 struct platform_device *pdev;
61 unsigned long long state;
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)
74 status = acpi_evaluate_integer(ac->adev->handle, "_PSR", NULL,
76 if (ACPI_FAILURE(status)) {
77 ACPI_EXCEPTION((AE_INFO, status,
78 "Error reading AC Adapter state"));
79 ac->state = ACPI_AC_STATUS_UNKNOWN;
86 /* --------------------------------------------------------------------------
88 -------------------------------------------------------------------------- */
89 static int get_ac_property(struct power_supply *psy,
90 enum power_supply_property psp,
91 union power_supply_propval *val)
93 struct acpi_ac *ac = to_acpi_ac(psy);
98 if (acpi_ac_get_state(ac))
102 case POWER_SUPPLY_PROP_ONLINE:
103 val->intval = ac->state;
111 static enum power_supply_property ac_props[] = {
112 POWER_SUPPLY_PROP_ONLINE,
115 /* --------------------------------------------------------------------------
117 -------------------------------------------------------------------------- */
119 static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
121 struct acpi_ac *ac = data;
128 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
129 "Unsupported event [0x%x]\n", event));
130 case ACPI_AC_NOTIFY_STATUS:
131 case ACPI_NOTIFY_BUS_CHECK:
132 case ACPI_NOTIFY_DEVICE_CHECK:
134 * A buggy BIOS may notify AC first and then sleep for
135 * a specific time before doing actual operations in the
136 * EC event handler (_Qxx). This will cause the AC state
137 * reported by the ACPI event to be incorrect, so wait for a
138 * specific time for the EC event handler to make progress.
140 if (ac_sleep_before_get_state_ms > 0)
141 msleep(ac_sleep_before_get_state_ms);
143 acpi_ac_get_state(ac);
144 acpi_bus_generate_netlink_event(ac->adev->pnp.device_class,
145 dev_name(&ac->pdev->dev),
146 event, (u32) ac->state);
147 acpi_notifier_call_chain(ac->adev, event, (u32) ac->state);
148 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
154 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
156 ac_sleep_before_get_state_ms = 1000;
160 static struct dmi_system_id ac_dmi_table[] = {
162 .callback = thinkpad_e530_quirk,
163 .ident = "thinkpad e530",
165 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
166 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
172 static int acpi_ac_probe(struct platform_device *pdev)
175 struct acpi_ac *ac = NULL;
176 struct acpi_device *adev;
181 result = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
185 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
189 strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
190 strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
193 platform_set_drvdata(pdev, ac);
195 result = acpi_ac_get_state(ac);
199 ac->charger.name = acpi_device_bid(adev);
200 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
201 ac->charger.properties = ac_props;
202 ac->charger.num_properties = ARRAY_SIZE(ac_props);
203 ac->charger.get_property = get_ac_property;
204 result = power_supply_register(&pdev->dev, &ac->charger);
208 result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
209 ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler, ac);
211 power_supply_unregister(&ac->charger);
214 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
215 acpi_device_name(adev), acpi_device_bid(adev),
216 ac->state ? "on-line" : "off-line");
222 dmi_check_system(ac_dmi_table);
226 #ifdef CONFIG_PM_SLEEP
227 static int acpi_ac_resume(struct device *dev)
235 ac = platform_get_drvdata(to_platform_device(dev));
239 old_state = ac->state;
240 if (acpi_ac_get_state(ac))
242 if (old_state != ac->state)
243 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
247 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
249 static int acpi_ac_remove(struct platform_device *pdev)
256 acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
257 ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler);
259 ac = platform_get_drvdata(pdev);
261 power_supply_unregister(&ac->charger);
268 static const struct acpi_device_id acpi_ac_match[] = {
272 MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
274 static struct platform_driver acpi_ac_driver = {
275 .probe = acpi_ac_probe,
276 .remove = acpi_ac_remove,
279 .owner = THIS_MODULE,
280 .pm = &acpi_ac_pm_ops,
281 .acpi_match_table = ACPI_PTR(acpi_ac_match),
285 static int __init acpi_ac_init(void)
292 result = platform_driver_register(&acpi_ac_driver);
299 static void __exit acpi_ac_exit(void)
301 platform_driver_unregister(&acpi_ac_driver);
303 module_init(acpi_ac_init);
304 module_exit(acpi_ac_exit);