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 #ifdef CONFIG_ACPI_PROCFS_POWER
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
35 #include <linux/power_supply.h>
36 #include <acpi/acpi_bus.h>
37 #include <acpi/acpi_drivers.h>
39 #define PREFIX "ACPI: "
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);
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);
65 static void acpi_ac_notify(struct acpi_device *device, u32 event);
67 static const struct acpi_device_id ac_device_ids[] = {
71 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
73 static struct acpi_driver acpi_ac_driver = {
75 .class = ACPI_AC_CLASS,
77 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
80 .remove = acpi_ac_remove,
81 .resume = acpi_ac_resume,
82 .notify = acpi_ac_notify,
87 struct power_supply charger;
88 struct acpi_device * device;
89 unsigned long long state;
92 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
94 #ifdef CONFIG_ACPI_PROCFS_POWER
95 static const struct file_operations acpi_ac_fops = {
97 .open = acpi_ac_open_fs,
100 .release = single_release,
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);
109 case POWER_SUPPLY_PROP_ONLINE:
110 val->intval = ac->state;
118 static enum power_supply_property ac_props[] = {
119 POWER_SUPPLY_PROP_ONLINE,
121 /* --------------------------------------------------------------------------
122 AC Adapter Management
123 -------------------------------------------------------------------------- */
125 static int acpi_ac_get_state(struct acpi_ac *ac)
127 acpi_status status = AE_OK;
133 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
134 if (ACPI_FAILURE(status)) {
135 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
136 ac->state = ACPI_AC_STATUS_UNKNOWN;
143 #ifdef CONFIG_ACPI_PROCFS_POWER
144 /* --------------------------------------------------------------------------
146 -------------------------------------------------------------------------- */
148 static struct proc_dir_entry *acpi_ac_dir;
150 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
152 struct acpi_ac *ac = seq->private;
158 if (acpi_ac_get_state(ac)) {
159 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
163 seq_puts(seq, "state: ");
165 case ACPI_AC_STATUS_OFFLINE:
166 seq_puts(seq, "off-line\n");
168 case ACPI_AC_STATUS_ONLINE:
169 seq_puts(seq, "on-line\n");
172 seq_puts(seq, "unknown\n");
179 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
181 return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
184 static int acpi_ac_add_fs(struct acpi_device *device)
186 struct proc_dir_entry *entry = NULL;
189 if (!acpi_device_dir(device)) {
190 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
192 if (!acpi_device_dir(device))
197 entry = proc_create_data(ACPI_AC_FILE_STATE,
198 S_IRUGO, acpi_device_dir(device),
199 &acpi_ac_fops, acpi_driver_data(device));
205 static int acpi_ac_remove_fs(struct acpi_device *device)
208 if (acpi_device_dir(device)) {
209 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
211 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
212 acpi_device_dir(device) = NULL;
219 /* --------------------------------------------------------------------------
221 -------------------------------------------------------------------------- */
223 static void acpi_ac_notify(struct acpi_device *device, u32 event)
225 struct acpi_ac *ac = acpi_driver_data(device);
233 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
234 "Unsupported event [0x%x]\n", event));
235 case ACPI_AC_NOTIFY_STATUS:
236 case ACPI_NOTIFY_BUS_CHECK:
237 case ACPI_NOTIFY_DEVICE_CHECK:
238 acpi_ac_get_state(ac);
239 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
240 acpi_bus_generate_netlink_event(device->pnp.device_class,
241 dev_name(&device->dev), event,
243 acpi_notifier_call_chain(device, event, (u32) ac->state);
244 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
250 static int acpi_ac_add(struct acpi_device *device)
253 struct acpi_ac *ac = NULL;
259 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
264 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
265 strcpy(acpi_device_class(device), ACPI_AC_CLASS);
266 device->driver_data = ac;
268 result = acpi_ac_get_state(ac);
272 #ifdef CONFIG_ACPI_PROCFS_POWER
273 result = acpi_ac_add_fs(device);
277 ac->charger.name = acpi_device_bid(device);
278 ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
279 ac->charger.properties = ac_props;
280 ac->charger.num_properties = ARRAY_SIZE(ac_props);
281 ac->charger.get_property = get_ac_property;
282 power_supply_register(&ac->device->dev, &ac->charger);
284 printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
285 acpi_device_name(device), acpi_device_bid(device),
286 ac->state ? "on-line" : "off-line");
290 #ifdef CONFIG_ACPI_PROCFS_POWER
291 acpi_ac_remove_fs(device);
299 static int acpi_ac_resume(struct acpi_device *device)
303 if (!device || !acpi_driver_data(device))
305 ac = acpi_driver_data(device);
306 old_state = ac->state;
307 if (acpi_ac_get_state(ac))
309 if (old_state != ac->state)
310 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
314 static int acpi_ac_remove(struct acpi_device *device, int type)
316 struct acpi_ac *ac = NULL;
319 if (!device || !acpi_driver_data(device))
322 ac = acpi_driver_data(device);
325 power_supply_unregister(&ac->charger);
326 #ifdef CONFIG_ACPI_PROCFS_POWER
327 acpi_ac_remove_fs(device);
335 static int __init acpi_ac_init(void)
342 #ifdef CONFIG_ACPI_PROCFS_POWER
343 acpi_ac_dir = acpi_lock_ac_dir();
348 result = acpi_bus_register_driver(&acpi_ac_driver);
350 #ifdef CONFIG_ACPI_PROCFS_POWER
351 acpi_unlock_ac_dir(acpi_ac_dir);
359 static void __exit acpi_ac_exit(void)
362 acpi_bus_unregister_driver(&acpi_ac_driver);
364 #ifdef CONFIG_ACPI_PROCFS_POWER
365 acpi_unlock_ac_dir(acpi_ac_dir);
371 module_init(acpi_ac_init);
372 module_exit(acpi_ac_exit);