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 void acpi_ac_notify(struct acpi_device
*device
, u32 event
);
66 static const struct acpi_device_id ac_device_ids
[] = {
70 MODULE_DEVICE_TABLE(acpi
, ac_device_ids
);
72 static int acpi_ac_resume(struct device
*dev
);
73 static SIMPLE_DEV_PM_OPS(acpi_ac_pm
, NULL
, acpi_ac_resume
);
75 static struct acpi_driver acpi_ac_driver
= {
77 .class = ACPI_AC_CLASS
,
79 .flags
= ACPI_DRIVER_ALL_NOTIFY_EVENTS
,
82 .remove
= acpi_ac_remove
,
83 .notify
= acpi_ac_notify
,
85 .drv
.pm
= &acpi_ac_pm
,
89 struct power_supply charger
;
90 struct acpi_device
* device
;
91 unsigned long long state
;
94 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
96 #ifdef CONFIG_ACPI_PROCFS_POWER
97 static const struct file_operations acpi_ac_fops
= {
99 .open
= acpi_ac_open_fs
,
102 .release
= single_release
,
106 /* --------------------------------------------------------------------------
107 AC Adapter Management
108 -------------------------------------------------------------------------- */
110 static int acpi_ac_get_state(struct acpi_ac
*ac
)
112 acpi_status status
= AE_OK
;
118 status
= acpi_evaluate_integer(ac
->device
->handle
, "_PSR", NULL
, &ac
->state
);
119 if (ACPI_FAILURE(status
)) {
120 ACPI_EXCEPTION((AE_INFO
, status
, "Error reading AC Adapter state"));
121 ac
->state
= ACPI_AC_STATUS_UNKNOWN
;
128 /* --------------------------------------------------------------------------
130 -------------------------------------------------------------------------- */
131 static int get_ac_property(struct power_supply
*psy
,
132 enum power_supply_property psp
,
133 union power_supply_propval
*val
)
135 struct acpi_ac
*ac
= to_acpi_ac(psy
);
140 if (acpi_ac_get_state(ac
))
144 case POWER_SUPPLY_PROP_ONLINE
:
145 val
->intval
= ac
->state
;
153 static enum power_supply_property ac_props
[] = {
154 POWER_SUPPLY_PROP_ONLINE
,
157 #ifdef CONFIG_ACPI_PROCFS_POWER
158 /* --------------------------------------------------------------------------
160 -------------------------------------------------------------------------- */
162 static struct proc_dir_entry
*acpi_ac_dir
;
164 static int acpi_ac_seq_show(struct seq_file
*seq
, void *offset
)
166 struct acpi_ac
*ac
= seq
->private;
172 if (acpi_ac_get_state(ac
)) {
173 seq_puts(seq
, "ERROR: Unable to read AC Adapter state\n");
177 seq_puts(seq
, "state: ");
179 case ACPI_AC_STATUS_OFFLINE
:
180 seq_puts(seq
, "off-line\n");
182 case ACPI_AC_STATUS_ONLINE
:
183 seq_puts(seq
, "on-line\n");
186 seq_puts(seq
, "unknown\n");
193 static int acpi_ac_open_fs(struct inode
*inode
, struct file
*file
)
195 return single_open(file
, acpi_ac_seq_show
, PDE(inode
)->data
);
198 static int acpi_ac_add_fs(struct acpi_device
*device
)
200 struct proc_dir_entry
*entry
= NULL
;
202 printk(KERN_WARNING PREFIX
"Deprecated procfs I/F for AC is loaded,"
203 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
204 if (!acpi_device_dir(device
)) {
205 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
207 if (!acpi_device_dir(device
))
212 entry
= proc_create_data(ACPI_AC_FILE_STATE
,
213 S_IRUGO
, acpi_device_dir(device
),
214 &acpi_ac_fops
, acpi_driver_data(device
));
220 static int acpi_ac_remove_fs(struct acpi_device
*device
)
223 if (acpi_device_dir(device
)) {
224 remove_proc_entry(ACPI_AC_FILE_STATE
, acpi_device_dir(device
));
226 remove_proc_entry(acpi_device_bid(device
), acpi_ac_dir
);
227 acpi_device_dir(device
) = NULL
;
234 /* --------------------------------------------------------------------------
236 -------------------------------------------------------------------------- */
238 static void acpi_ac_notify(struct acpi_device
*device
, u32 event
)
240 struct acpi_ac
*ac
= acpi_driver_data(device
);
248 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
249 "Unsupported event [0x%x]\n", event
));
250 case ACPI_AC_NOTIFY_STATUS
:
251 case ACPI_NOTIFY_BUS_CHECK
:
252 case ACPI_NOTIFY_DEVICE_CHECK
:
253 acpi_ac_get_state(ac
);
254 acpi_bus_generate_proc_event(device
, event
, (u32
) ac
->state
);
255 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
256 dev_name(&device
->dev
), event
,
258 acpi_notifier_call_chain(device
, event
, (u32
) ac
->state
);
259 kobject_uevent(&ac
->charger
.dev
->kobj
, KOBJ_CHANGE
);
265 static int acpi_ac_add(struct acpi_device
*device
)
268 struct acpi_ac
*ac
= NULL
;
274 ac
= kzalloc(sizeof(struct acpi_ac
), GFP_KERNEL
);
279 strcpy(acpi_device_name(device
), ACPI_AC_DEVICE_NAME
);
280 strcpy(acpi_device_class(device
), ACPI_AC_CLASS
);
281 device
->driver_data
= ac
;
283 result
= acpi_ac_get_state(ac
);
287 #ifdef CONFIG_ACPI_PROCFS_POWER
288 result
= acpi_ac_add_fs(device
);
292 ac
->charger
.name
= acpi_device_bid(device
);
293 ac
->charger
.type
= POWER_SUPPLY_TYPE_MAINS
;
294 ac
->charger
.properties
= ac_props
;
295 ac
->charger
.num_properties
= ARRAY_SIZE(ac_props
);
296 ac
->charger
.get_property
= get_ac_property
;
297 result
= power_supply_register(&ac
->device
->dev
, &ac
->charger
);
301 printk(KERN_INFO PREFIX
"%s [%s] (%s)\n",
302 acpi_device_name(device
), acpi_device_bid(device
),
303 ac
->state
? "on-line" : "off-line");
307 #ifdef CONFIG_ACPI_PROCFS_POWER
308 acpi_ac_remove_fs(device
);
316 static int acpi_ac_resume(struct device
*dev
)
324 ac
= acpi_driver_data(to_acpi_device(dev
));
328 old_state
= ac
->state
;
329 if (acpi_ac_get_state(ac
))
331 if (old_state
!= ac
->state
)
332 kobject_uevent(&ac
->charger
.dev
->kobj
, KOBJ_CHANGE
);
336 static int acpi_ac_remove(struct acpi_device
*device
, int type
)
338 struct acpi_ac
*ac
= NULL
;
341 if (!device
|| !acpi_driver_data(device
))
344 ac
= acpi_driver_data(device
);
347 power_supply_unregister(&ac
->charger
);
348 #ifdef CONFIG_ACPI_PROCFS_POWER
349 acpi_ac_remove_fs(device
);
357 static int __init
acpi_ac_init(void)
364 #ifdef CONFIG_ACPI_PROCFS_POWER
365 acpi_ac_dir
= acpi_lock_ac_dir();
370 result
= acpi_bus_register_driver(&acpi_ac_driver
);
372 #ifdef CONFIG_ACPI_PROCFS_POWER
373 acpi_unlock_ac_dir(acpi_ac_dir
);
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
);
393 module_init(acpi_ac_init
);
394 module_exit(acpi_ac_exit
);