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
);