[GFS2] Allow local DF locks when holding a cached EX glock
[linux-2.6/mini2440.git] / drivers / acpi / ac.c
blob831883b7d6c9c5f456bb8db766ebc978b00bd907
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/init.h>
29 #include <linux/types.h>
30 #ifdef CONFIG_ACPI_PROCFS_POWER
31 #include <linux/proc_fs.h>
32 #include <linux/seq_file.h>
33 #endif
34 #ifdef CONFIG_ACPI_SYSFS_POWER
35 #include <linux/power_supply.h>
36 #endif
37 #include <acpi/acpi_bus.h>
38 #include <acpi/acpi_drivers.h>
40 #define ACPI_AC_COMPONENT 0x00020000
41 #define ACPI_AC_CLASS "ac_adapter"
42 #define ACPI_AC_DEVICE_NAME "AC Adapter"
43 #define ACPI_AC_FILE_STATE "state"
44 #define ACPI_AC_NOTIFY_STATUS 0x80
45 #define ACPI_AC_STATUS_OFFLINE 0x00
46 #define ACPI_AC_STATUS_ONLINE 0x01
47 #define ACPI_AC_STATUS_UNKNOWN 0xFF
49 #define _COMPONENT ACPI_AC_COMPONENT
50 ACPI_MODULE_NAME("ac");
52 MODULE_AUTHOR("Paul Diefenbaugh");
53 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
54 MODULE_LICENSE("GPL");
56 #ifdef CONFIG_ACPI_PROCFS_POWER
57 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
58 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
59 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
60 #endif
62 static int acpi_ac_add(struct acpi_device *device);
63 static int acpi_ac_remove(struct acpi_device *device, int type);
64 static int acpi_ac_resume(struct acpi_device *device);
66 static const struct acpi_device_id ac_device_ids[] = {
67 {"ACPI0003", 0},
68 {"", 0},
70 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
72 static struct acpi_driver acpi_ac_driver = {
73 .name = "ac",
74 .class = ACPI_AC_CLASS,
75 .ids = ac_device_ids,
76 .ops = {
77 .add = acpi_ac_add,
78 .remove = acpi_ac_remove,
79 .resume = acpi_ac_resume,
83 struct acpi_ac {
84 #ifdef CONFIG_ACPI_SYSFS_POWER
85 struct power_supply charger;
86 #endif
87 struct acpi_device * device;
88 unsigned long state;
91 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
93 #ifdef CONFIG_ACPI_PROCFS_POWER
94 static const struct file_operations acpi_ac_fops = {
95 .owner = THIS_MODULE,
96 .open = acpi_ac_open_fs,
97 .read = seq_read,
98 .llseek = seq_lseek,
99 .release = single_release,
101 #endif
102 #ifdef CONFIG_ACPI_SYSFS_POWER
103 static int get_ac_property(struct power_supply *psy,
104 enum power_supply_property psp,
105 union power_supply_propval *val)
107 struct acpi_ac *ac = to_acpi_ac(psy);
108 switch (psp) {
109 case POWER_SUPPLY_PROP_ONLINE:
110 val->intval = ac->state;
111 break;
112 default:
113 return -EINVAL;
115 return 0;
118 static enum power_supply_property ac_props[] = {
119 POWER_SUPPLY_PROP_ONLINE,
121 #endif
122 /* --------------------------------------------------------------------------
123 AC Adapter Management
124 -------------------------------------------------------------------------- */
126 static int acpi_ac_get_state(struct acpi_ac *ac)
128 acpi_status status = AE_OK;
131 if (!ac)
132 return -EINVAL;
134 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
135 if (ACPI_FAILURE(status)) {
136 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
137 ac->state = ACPI_AC_STATUS_UNKNOWN;
138 return -ENODEV;
141 return 0;
144 #ifdef CONFIG_ACPI_PROCFS_POWER
145 /* --------------------------------------------------------------------------
146 FS Interface (/proc)
147 -------------------------------------------------------------------------- */
149 static struct proc_dir_entry *acpi_ac_dir;
151 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
153 struct acpi_ac *ac = seq->private;
156 if (!ac)
157 return 0;
159 if (acpi_ac_get_state(ac)) {
160 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
161 return 0;
164 seq_puts(seq, "state: ");
165 switch (ac->state) {
166 case ACPI_AC_STATUS_OFFLINE:
167 seq_puts(seq, "off-line\n");
168 break;
169 case ACPI_AC_STATUS_ONLINE:
170 seq_puts(seq, "on-line\n");
171 break;
172 default:
173 seq_puts(seq, "unknown\n");
174 break;
177 return 0;
180 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
182 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
185 static int acpi_ac_add_fs(struct acpi_device *device)
187 struct proc_dir_entry *entry = NULL;
190 if (!acpi_device_dir(device)) {
191 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
192 acpi_ac_dir);
193 if (!acpi_device_dir(device))
194 return -ENODEV;
195 acpi_device_dir(device)->owner = THIS_MODULE;
198 /* 'state' [R] */
199 entry = proc_create_data(ACPI_AC_FILE_STATE,
200 S_IRUGO, acpi_device_dir(device),
201 &acpi_ac_fops, acpi_driver_data(device));
202 if (!entry)
203 return -ENODEV;
204 return 0;
207 static int acpi_ac_remove_fs(struct acpi_device *device)
210 if (acpi_device_dir(device)) {
211 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
213 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
214 acpi_device_dir(device) = NULL;
217 return 0;
219 #endif
221 /* --------------------------------------------------------------------------
222 Driver Model
223 -------------------------------------------------------------------------- */
225 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
227 struct acpi_ac *ac = data;
228 struct acpi_device *device = NULL;
231 if (!ac)
232 return;
234 device = ac->device;
235 switch (event) {
236 default:
237 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
238 "Unsupported event [0x%x]\n", event));
239 case ACPI_AC_NOTIFY_STATUS:
240 case ACPI_NOTIFY_BUS_CHECK:
241 case ACPI_NOTIFY_DEVICE_CHECK:
242 acpi_ac_get_state(ac);
243 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
244 acpi_bus_generate_netlink_event(device->pnp.device_class,
245 device->dev.bus_id, event,
246 (u32) ac->state);
247 #ifdef CONFIG_ACPI_SYSFS_POWER
248 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
249 #endif
252 return;
255 static int acpi_ac_add(struct acpi_device *device)
257 int result = 0;
258 acpi_status status = AE_OK;
259 struct acpi_ac *ac = NULL;
262 if (!device)
263 return -EINVAL;
265 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
266 if (!ac)
267 return -ENOMEM;
269 ac->device = device;
270 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
271 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
272 acpi_driver_data(device) = ac;
274 result = acpi_ac_get_state(ac);
275 if (result)
276 goto end;
278 #ifdef CONFIG_ACPI_PROCFS_POWER
279 result = acpi_ac_add_fs(device);
280 #endif
281 if (result)
282 goto end;
283 #ifdef CONFIG_ACPI_SYSFS_POWER
284 ac->charger.name = acpi_device_bid(device);
285 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
286 ac->charger.properties = ac_props;
287 ac->charger.num_properties = ARRAY_SIZE(ac_props);
288 ac->charger.get_property = get_ac_property;
289 power_supply_register(&ac->device->dev, &ac->charger);
290 #endif
291 status = acpi_install_notify_handler(device->handle,
292 ACPI_ALL_NOTIFY, acpi_ac_notify,
293 ac);
294 if (ACPI_FAILURE(status)) {
295 result = -ENODEV;
296 goto end;
299 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
300 acpi_device_name(device), acpi_device_bid(device),
301 ac->state ? "on-line" : "off-line");
303 end:
304 if (result) {
305 #ifdef CONFIG_ACPI_PROCFS_POWER
306 acpi_ac_remove_fs(device);
307 #endif
308 kfree(ac);
311 return result;
314 static int acpi_ac_resume(struct acpi_device *device)
316 struct acpi_ac *ac;
317 unsigned old_state;
318 if (!device || !acpi_driver_data(device))
319 return -EINVAL;
320 ac = acpi_driver_data(device);
321 old_state = ac->state;
322 if (acpi_ac_get_state(ac))
323 return 0;
324 #ifdef CONFIG_ACPI_SYSFS_POWER
325 if (old_state != ac->state)
326 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
327 #endif
328 return 0;
331 static int acpi_ac_remove(struct acpi_device *device, int type)
333 acpi_status status = AE_OK;
334 struct acpi_ac *ac = NULL;
337 if (!device || !acpi_driver_data(device))
338 return -EINVAL;
340 ac = acpi_driver_data(device);
342 status = acpi_remove_notify_handler(device->handle,
343 ACPI_ALL_NOTIFY, acpi_ac_notify);
344 #ifdef CONFIG_ACPI_SYSFS_POWER
345 if (ac->charger.dev)
346 power_supply_unregister(&ac->charger);
347 #endif
348 #ifdef CONFIG_ACPI_PROCFS_POWER
349 acpi_ac_remove_fs(device);
350 #endif
352 kfree(ac);
354 return 0;
357 static int __init acpi_ac_init(void)
359 int result;
361 if (acpi_disabled)
362 return -ENODEV;
364 #ifdef CONFIG_ACPI_PROCFS_POWER
365 acpi_ac_dir = acpi_lock_ac_dir();
366 if (!acpi_ac_dir)
367 return -ENODEV;
368 #endif
370 result = acpi_bus_register_driver(&acpi_ac_driver);
371 if (result < 0) {
372 #ifdef CONFIG_ACPI_PROCFS_POWER
373 acpi_unlock_ac_dir(acpi_ac_dir);
374 #endif
375 return -ENODEV;
378 return 0;
381 static void __exit acpi_ac_exit(void)
384 acpi_bus_unregister_driver(&acpi_ac_driver);
386 #ifdef CONFIG_ACPI_PROCFS_POWER
387 acpi_unlock_ac_dir(acpi_ac_dir);
388 #endif
390 return;
393 module_init(acpi_ac_init);
394 module_exit(acpi_ac_exit);