x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / acpi / ac.c
blobf37beaa32750106dffdf9fd7aeac764f1f0094f2
1 /*
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 #ifdef CONFIG_ACPI_PROCFS_POWER
34 #include <linux/proc_fs.h>
35 #include <linux/seq_file.h>
36 #endif
37 #include <linux/power_supply.h>
38 #include <acpi/acpi_bus.h>
39 #include <acpi/acpi_drivers.h>
41 #define PREFIX "ACPI: "
43 #define ACPI_AC_CLASS "ac_adapter"
44 #define ACPI_AC_DEVICE_NAME "AC Adapter"
45 #define ACPI_AC_FILE_STATE "state"
46 #define ACPI_AC_NOTIFY_STATUS 0x80
47 #define ACPI_AC_STATUS_OFFLINE 0x00
48 #define ACPI_AC_STATUS_ONLINE 0x01
49 #define ACPI_AC_STATUS_UNKNOWN 0xFF
51 #define _COMPONENT ACPI_AC_COMPONENT
52 ACPI_MODULE_NAME("ac");
54 MODULE_AUTHOR("Paul Diefenbaugh");
55 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
56 MODULE_LICENSE("GPL");
58 #ifdef CONFIG_ACPI_PROCFS_POWER
59 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
60 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
61 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
62 #endif
64 static int acpi_ac_add(struct acpi_device *device);
65 static int acpi_ac_remove(struct acpi_device *device);
66 static void acpi_ac_notify(struct acpi_device *device, u32 event);
68 static const struct acpi_device_id ac_device_ids[] = {
69 {"ACPI0003", 0},
70 {"", 0},
72 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
74 #ifdef CONFIG_PM_SLEEP
75 static int acpi_ac_resume(struct device *dev);
76 #endif
77 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
79 static int ac_sleep_before_get_state_ms;
81 static struct acpi_driver acpi_ac_driver = {
82 .name = "ac",
83 .class = ACPI_AC_CLASS,
84 .ids = ac_device_ids,
85 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
86 .ops = {
87 .add = acpi_ac_add,
88 .remove = acpi_ac_remove,
89 .notify = acpi_ac_notify,
91 .drv.pm = &acpi_ac_pm,
94 struct acpi_ac {
95 struct power_supply charger;
96 struct acpi_device * device;
97 unsigned long long state;
100 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
102 #ifdef CONFIG_ACPI_PROCFS_POWER
103 static const struct file_operations acpi_ac_fops = {
104 .owner = THIS_MODULE,
105 .open = acpi_ac_open_fs,
106 .read = seq_read,
107 .llseek = seq_lseek,
108 .release = single_release,
110 #endif
112 /* --------------------------------------------------------------------------
113 AC Adapter Management
114 -------------------------------------------------------------------------- */
116 static int acpi_ac_get_state(struct acpi_ac *ac)
118 acpi_status status = AE_OK;
121 if (!ac)
122 return -EINVAL;
124 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
125 if (ACPI_FAILURE(status)) {
126 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
127 ac->state = ACPI_AC_STATUS_UNKNOWN;
128 return -ENODEV;
131 return 0;
134 /* --------------------------------------------------------------------------
135 sysfs I/F
136 -------------------------------------------------------------------------- */
137 static int get_ac_property(struct power_supply *psy,
138 enum power_supply_property psp,
139 union power_supply_propval *val)
141 struct acpi_ac *ac = to_acpi_ac(psy);
143 if (!ac)
144 return -ENODEV;
146 if (acpi_ac_get_state(ac))
147 return -ENODEV;
149 switch (psp) {
150 case POWER_SUPPLY_PROP_ONLINE:
151 val->intval = ac->state;
152 break;
153 default:
154 return -EINVAL;
156 return 0;
159 static enum power_supply_property ac_props[] = {
160 POWER_SUPPLY_PROP_ONLINE,
163 #ifdef CONFIG_ACPI_PROCFS_POWER
164 /* --------------------------------------------------------------------------
165 FS Interface (/proc)
166 -------------------------------------------------------------------------- */
168 static struct proc_dir_entry *acpi_ac_dir;
170 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
172 struct acpi_ac *ac = seq->private;
175 if (!ac)
176 return 0;
178 if (acpi_ac_get_state(ac)) {
179 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
180 return 0;
183 seq_puts(seq, "state: ");
184 switch (ac->state) {
185 case ACPI_AC_STATUS_OFFLINE:
186 seq_puts(seq, "off-line\n");
187 break;
188 case ACPI_AC_STATUS_ONLINE:
189 seq_puts(seq, "on-line\n");
190 break;
191 default:
192 seq_puts(seq, "unknown\n");
193 break;
196 return 0;
199 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
201 return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
204 static int acpi_ac_add_fs(struct acpi_device *device)
206 struct proc_dir_entry *entry = NULL;
208 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
209 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
210 if (!acpi_device_dir(device)) {
211 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
212 acpi_ac_dir);
213 if (!acpi_device_dir(device))
214 return -ENODEV;
217 /* 'state' [R] */
218 entry = proc_create_data(ACPI_AC_FILE_STATE,
219 S_IRUGO, acpi_device_dir(device),
220 &acpi_ac_fops, acpi_driver_data(device));
221 if (!entry)
222 return -ENODEV;
223 return 0;
226 static int acpi_ac_remove_fs(struct acpi_device *device)
229 if (acpi_device_dir(device)) {
230 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
232 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
233 acpi_device_dir(device) = NULL;
236 return 0;
238 #endif
240 /* --------------------------------------------------------------------------
241 Driver Model
242 -------------------------------------------------------------------------- */
244 static void acpi_ac_notify(struct acpi_device *device, u32 event)
246 struct acpi_ac *ac = acpi_driver_data(device);
249 if (!ac)
250 return;
252 switch (event) {
253 default:
254 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
255 "Unsupported event [0x%x]\n", event));
256 case ACPI_AC_NOTIFY_STATUS:
257 case ACPI_NOTIFY_BUS_CHECK:
258 case ACPI_NOTIFY_DEVICE_CHECK:
260 * A buggy BIOS may notify AC first and then sleep for
261 * a specific time before doing actual operations in the
262 * EC event handler (_Qxx). This will cause the AC state
263 * reported by the ACPI event to be incorrect, so wait for a
264 * specific time for the EC event handler to make progress.
266 if (ac_sleep_before_get_state_ms > 0)
267 msleep(ac_sleep_before_get_state_ms);
269 acpi_ac_get_state(ac);
270 acpi_bus_generate_netlink_event(device->pnp.device_class,
271 dev_name(&device->dev), event,
272 (u32) ac->state);
273 acpi_notifier_call_chain(device, event, (u32) ac->state);
274 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
277 return;
280 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
282 ac_sleep_before_get_state_ms = 1000;
283 return 0;
286 static struct dmi_system_id ac_dmi_table[] = {
288 .callback = thinkpad_e530_quirk,
289 .ident = "thinkpad e530",
290 .matches = {
291 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
292 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
298 static int acpi_ac_add(struct acpi_device *device)
300 int result = 0;
301 struct acpi_ac *ac = NULL;
304 if (!device)
305 return -EINVAL;
307 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
308 if (!ac)
309 return -ENOMEM;
311 ac->device = device;
312 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
313 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
314 device->driver_data = ac;
316 result = acpi_ac_get_state(ac);
317 if (result)
318 goto end;
320 #ifdef CONFIG_ACPI_PROCFS_POWER
321 result = acpi_ac_add_fs(device);
322 #endif
323 if (result)
324 goto end;
325 ac->charger.name = acpi_device_bid(device);
326 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
327 ac->charger.properties = ac_props;
328 ac->charger.num_properties = ARRAY_SIZE(ac_props);
329 ac->charger.get_property = get_ac_property;
330 result = power_supply_register(&ac->device->dev, &ac->charger);
331 if (result)
332 goto end;
334 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
335 acpi_device_name(device), acpi_device_bid(device),
336 ac->state ? "on-line" : "off-line");
338 end:
339 if (result) {
340 #ifdef CONFIG_ACPI_PROCFS_POWER
341 acpi_ac_remove_fs(device);
342 #endif
343 kfree(ac);
346 dmi_check_system(ac_dmi_table);
347 return result;
350 #ifdef CONFIG_PM_SLEEP
351 static int acpi_ac_resume(struct device *dev)
353 struct acpi_ac *ac;
354 unsigned old_state;
356 if (!dev)
357 return -EINVAL;
359 ac = acpi_driver_data(to_acpi_device(dev));
360 if (!ac)
361 return -EINVAL;
363 old_state = ac->state;
364 if (acpi_ac_get_state(ac))
365 return 0;
366 if (old_state != ac->state)
367 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
368 return 0;
370 #endif
372 static int acpi_ac_remove(struct acpi_device *device)
374 struct acpi_ac *ac = NULL;
377 if (!device || !acpi_driver_data(device))
378 return -EINVAL;
380 ac = acpi_driver_data(device);
382 if (ac->charger.dev)
383 power_supply_unregister(&ac->charger);
384 #ifdef CONFIG_ACPI_PROCFS_POWER
385 acpi_ac_remove_fs(device);
386 #endif
388 kfree(ac);
390 return 0;
393 static int __init acpi_ac_init(void)
395 int result;
397 if (acpi_disabled)
398 return -ENODEV;
400 #ifdef CONFIG_ACPI_PROCFS_POWER
401 acpi_ac_dir = acpi_lock_ac_dir();
402 if (!acpi_ac_dir)
403 return -ENODEV;
404 #endif
406 result = acpi_bus_register_driver(&acpi_ac_driver);
407 if (result < 0) {
408 #ifdef CONFIG_ACPI_PROCFS_POWER
409 acpi_unlock_ac_dir(acpi_ac_dir);
410 #endif
411 return -ENODEV;
414 return 0;
417 static void __exit acpi_ac_exit(void)
420 acpi_bus_unregister_driver(&acpi_ac_driver);
422 #ifdef CONFIG_ACPI_PROCFS_POWER
423 acpi_unlock_ac_dir(acpi_ac_dir);
424 #endif
426 return;
429 module_init(acpi_ac_init);
430 module_exit(acpi_ac_exit);