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1 /*
2  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
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.
13  *
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.
18  *
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.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25
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>
37
38 #define PREFIX "ACPI: "
39
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
47
48 #define _COMPONENT              ACPI_AC_COMPONENT
49 ACPI_MODULE_NAME("ac");
50
51 MODULE_AUTHOR("Paul Diefenbaugh");
52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53 MODULE_LICENSE("GPL");
54
55 static int ac_sleep_before_get_state_ms;
56
57 struct acpi_ac {
58         struct power_supply charger;
59         struct acpi_device *adev;
60         struct platform_device *pdev;
61         unsigned long long state;
62 };
63
64 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
65
66 /* --------------------------------------------------------------------------
67                                AC Adapter Management
68    -------------------------------------------------------------------------- */
69
70 static int acpi_ac_get_state(struct acpi_ac *ac)
71 {
72         acpi_status status;
73
74         status = acpi_evaluate_integer(ac->adev->handle, "_PSR", NULL,
75                                        &ac->state);
76         if (ACPI_FAILURE(status)) {
77                 ACPI_EXCEPTION((AE_INFO, status,
78                                 "Error reading AC Adapter state"));
79                 ac->state = ACPI_AC_STATUS_UNKNOWN;
80                 return -ENODEV;
81         }
82
83         return 0;
84 }
85
86 /* --------------------------------------------------------------------------
87                             sysfs I/F
88    -------------------------------------------------------------------------- */
89 static int get_ac_property(struct power_supply *psy,
90                            enum power_supply_property psp,
91                            union power_supply_propval *val)
92 {
93         struct acpi_ac *ac = to_acpi_ac(psy);
94
95         if (!ac)
96                 return -ENODEV;
97
98         if (acpi_ac_get_state(ac))
99                 return -ENODEV;
100
101         switch (psp) {
102         case POWER_SUPPLY_PROP_ONLINE:
103                 val->intval = ac->state;
104                 break;
105         default:
106                 return -EINVAL;
107         }
108         return 0;
109 }
110
111 static enum power_supply_property ac_props[] = {
112         POWER_SUPPLY_PROP_ONLINE,
113 };
114
115 /* --------------------------------------------------------------------------
116                                    Driver Model
117    -------------------------------------------------------------------------- */
118
119 static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
120 {
121         struct acpi_ac *ac = data;
122
123         if (!ac)
124                 return;
125
126         switch (event) {
127         default:
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:
133                 /*
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.
139                  */
140                 if (ac_sleep_before_get_state_ms > 0)
141                         msleep(ac_sleep_before_get_state_ms);
142
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);
149         }
150
151         return;
152 }
153
154 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
155 {
156         ac_sleep_before_get_state_ms = 1000;
157         return 0;
158 }
159
160 static struct dmi_system_id ac_dmi_table[] = {
161         {
162         .callback = thinkpad_e530_quirk,
163         .ident = "thinkpad e530",
164         .matches = {
165                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
166                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
167                 },
168         },
169         {},
170 };
171
172 static int acpi_ac_probe(struct platform_device *pdev)
173 {
174         int result = 0;
175         struct acpi_ac *ac = NULL;
176         struct acpi_device *adev;
177
178         if (!pdev)
179                 return -EINVAL;
180
181         result = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
182         if (result)
183                 return -ENODEV;
184
185         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
186         if (!ac)
187                 return -ENOMEM;
188
189         strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
190         strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
191         ac->adev = adev;
192         ac->pdev = pdev;
193         platform_set_drvdata(pdev, ac);
194
195         result = acpi_ac_get_state(ac);
196         if (result)
197                 goto end;
198
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);
205         if (result)
206                 goto end;
207
208         result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
209                         ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler, ac);
210         if (result) {
211                 power_supply_unregister(&ac->charger);
212                 goto end;
213         }
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");
217
218 end:
219         if (result)
220                 kfree(ac);
221
222         dmi_check_system(ac_dmi_table);
223         return result;
224 }
225
226 #ifdef CONFIG_PM_SLEEP
227 static int acpi_ac_resume(struct device *dev)
228 {
229         struct acpi_ac *ac;
230         unsigned old_state;
231
232         if (!dev)
233                 return -EINVAL;
234
235         ac = platform_get_drvdata(to_platform_device(dev));
236         if (!ac)
237                 return -EINVAL;
238
239         old_state = ac->state;
240         if (acpi_ac_get_state(ac))
241                 return 0;
242         if (old_state != ac->state)
243                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
244         return 0;
245 }
246 #endif
247 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
248
249 static int acpi_ac_remove(struct platform_device *pdev)
250 {
251         struct acpi_ac *ac;
252
253         if (!pdev)
254                 return -EINVAL;
255
256         acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
257                         ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler);
258
259         ac = platform_get_drvdata(pdev);
260         if (ac->charger.dev)
261                 power_supply_unregister(&ac->charger);
262
263         kfree(ac);
264
265         return 0;
266 }
267
268 static const struct acpi_device_id acpi_ac_match[] = {
269         { "ACPI0003", 0 },
270         { }
271 };
272 MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
273
274 static struct platform_driver acpi_ac_driver = {
275         .probe          = acpi_ac_probe,
276         .remove         = acpi_ac_remove,
277         .driver         = {
278                 .name   = "acpi-ac",
279                 .owner  = THIS_MODULE,
280                 .pm     = &acpi_ac_pm_ops,
281                 .acpi_match_table = ACPI_PTR(acpi_ac_match),
282         },
283 };
284
285 static int __init acpi_ac_init(void)
286 {
287         int result;
288
289         if (acpi_disabled)
290                 return -ENODEV;
291
292         result = platform_driver_register(&acpi_ac_driver);
293         if (result < 0)
294                 return -ENODEV;
295
296         return 0;
297 }
298
299 static void __exit acpi_ac_exit(void)
300 {
301         platform_driver_unregister(&acpi_ac_driver);
302 }
303 module_init(acpi_ac_init);
304 module_exit(acpi_ac_exit);