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 #include <linux/platform_device.h>
34 #include <linux/power_supply.h>
35 #include <linux/acpi.h>
38 #define PREFIX "ACPI: "
40 #define ACPI_AC_CLASS "ac_adapter"
41 #define ACPI_AC_DEVICE_NAME "AC Adapter"
42 #define ACPI_AC_FILE_STATE "state"
43 #define ACPI_AC_NOTIFY_STATUS 0x80
44 #define ACPI_AC_STATUS_OFFLINE 0x00
45 #define ACPI_AC_STATUS_ONLINE 0x01
46 #define ACPI_AC_STATUS_UNKNOWN 0xFF
48 #define _COMPONENT ACPI_AC_COMPONENT
49 ACPI_MODULE_NAME("ac");
51 MODULE_AUTHOR("Paul Diefenbaugh");
52 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
53 MODULE_LICENSE("GPL");
55 static int acpi_ac_add(struct acpi_device
*device
);
56 static int acpi_ac_remove(struct acpi_device
*device
);
57 static void acpi_ac_notify(struct acpi_device
*device
, u32 event
);
59 static const struct acpi_device_id ac_device_ids
[] = {
63 MODULE_DEVICE_TABLE(acpi
, ac_device_ids
);
65 #ifdef CONFIG_PM_SLEEP
66 static int acpi_ac_resume(struct device
*dev
);
68 static SIMPLE_DEV_PM_OPS(acpi_ac_pm
, NULL
, acpi_ac_resume
);
70 static int ac_sleep_before_get_state_ms
;
72 static struct acpi_driver acpi_ac_driver
= {
74 .class = ACPI_AC_CLASS
,
76 .flags
= ACPI_DRIVER_ALL_NOTIFY_EVENTS
,
79 .remove
= acpi_ac_remove
,
80 .notify
= acpi_ac_notify
,
82 .drv
.pm
= &acpi_ac_pm
,
86 struct power_supply charger
;
87 struct acpi_device
* device
;
88 unsigned long long state
;
89 struct notifier_block battery_nb
;
92 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
94 /* --------------------------------------------------------------------------
96 -------------------------------------------------------------------------- */
98 static int acpi_ac_get_state(struct acpi_ac
*ac
)
100 acpi_status status
= AE_OK
;
105 status
= acpi_evaluate_integer(ac
->device
->handle
, "_PSR", NULL
,
107 if (ACPI_FAILURE(status
)) {
108 ACPI_EXCEPTION((AE_INFO
, status
,
109 "Error reading AC Adapter state"));
110 ac
->state
= ACPI_AC_STATUS_UNKNOWN
;
117 /* --------------------------------------------------------------------------
119 -------------------------------------------------------------------------- */
120 static int get_ac_property(struct power_supply
*psy
,
121 enum power_supply_property psp
,
122 union power_supply_propval
*val
)
124 struct acpi_ac
*ac
= to_acpi_ac(psy
);
129 if (acpi_ac_get_state(ac
))
133 case POWER_SUPPLY_PROP_ONLINE
:
134 val
->intval
= ac
->state
;
142 static enum power_supply_property ac_props
[] = {
143 POWER_SUPPLY_PROP_ONLINE
,
146 /* --------------------------------------------------------------------------
148 -------------------------------------------------------------------------- */
150 static void acpi_ac_notify(struct acpi_device
*device
, u32 event
)
152 struct acpi_ac
*ac
= acpi_driver_data(device
);
159 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
160 "Unsupported event [0x%x]\n", event
));
161 case ACPI_AC_NOTIFY_STATUS
:
162 case ACPI_NOTIFY_BUS_CHECK
:
163 case ACPI_NOTIFY_DEVICE_CHECK
:
165 * A buggy BIOS may notify AC first and then sleep for
166 * a specific time before doing actual operations in the
167 * EC event handler (_Qxx). This will cause the AC state
168 * reported by the ACPI event to be incorrect, so wait for a
169 * specific time for the EC event handler to make progress.
171 if (ac_sleep_before_get_state_ms
> 0)
172 msleep(ac_sleep_before_get_state_ms
);
174 acpi_ac_get_state(ac
);
175 acpi_bus_generate_netlink_event(device
->pnp
.device_class
,
176 dev_name(&device
->dev
), event
,
178 acpi_notifier_call_chain(device
, event
, (u32
) ac
->state
);
179 kobject_uevent(&ac
->charger
.dev
->kobj
, KOBJ_CHANGE
);
185 static int acpi_ac_battery_notify(struct notifier_block
*nb
,
186 unsigned long action
, void *data
)
188 struct acpi_ac
*ac
= container_of(nb
, struct acpi_ac
, battery_nb
);
189 struct acpi_bus_event
*event
= (struct acpi_bus_event
*)data
;
192 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
193 * when adapter is plugged/unplugged. However, battery status
194 * notifcations are triggered when battery starts charging or
195 * discharging. Re-reading AC status triggers lost AC notifications,
196 * if AC status has changed.
198 if (strcmp(event
->device_class
, ACPI_BATTERY_CLASS
) == 0 &&
199 event
->type
== ACPI_BATTERY_NOTIFY_STATUS
)
200 acpi_ac_get_state(ac
);
205 static int thinkpad_e530_quirk(const struct dmi_system_id
*d
)
207 ac_sleep_before_get_state_ms
= 1000;
211 static struct dmi_system_id ac_dmi_table
[] = {
213 .callback
= thinkpad_e530_quirk
,
214 .ident
= "thinkpad e530",
216 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
217 DMI_MATCH(DMI_PRODUCT_NAME
, "32597CG"),
223 static int acpi_ac_add(struct acpi_device
*device
)
226 struct acpi_ac
*ac
= NULL
;
232 ac
= kzalloc(sizeof(struct acpi_ac
), GFP_KERNEL
);
237 strcpy(acpi_device_name(device
), ACPI_AC_DEVICE_NAME
);
238 strcpy(acpi_device_class(device
), ACPI_AC_CLASS
);
239 device
->driver_data
= ac
;
241 result
= acpi_ac_get_state(ac
);
245 ac
->charger
.name
= acpi_device_bid(device
);
246 ac
->charger
.type
= POWER_SUPPLY_TYPE_MAINS
;
247 ac
->charger
.properties
= ac_props
;
248 ac
->charger
.num_properties
= ARRAY_SIZE(ac_props
);
249 ac
->charger
.get_property
= get_ac_property
;
250 result
= power_supply_register(&ac
->device
->dev
, &ac
->charger
);
254 printk(KERN_INFO PREFIX
"%s [%s] (%s)\n",
255 acpi_device_name(device
), acpi_device_bid(device
),
256 ac
->state
? "on-line" : "off-line");
258 ac
->battery_nb
.notifier_call
= acpi_ac_battery_notify
;
259 register_acpi_notifier(&ac
->battery_nb
);
264 dmi_check_system(ac_dmi_table
);
268 #ifdef CONFIG_PM_SLEEP
269 static int acpi_ac_resume(struct device
*dev
)
277 ac
= acpi_driver_data(to_acpi_device(dev
));
281 old_state
= ac
->state
;
282 if (acpi_ac_get_state(ac
))
284 if (old_state
!= ac
->state
)
285 kobject_uevent(&ac
->charger
.dev
->kobj
, KOBJ_CHANGE
);
289 #define acpi_ac_resume NULL
292 static int acpi_ac_remove(struct acpi_device
*device
)
294 struct acpi_ac
*ac
= NULL
;
297 if (!device
|| !acpi_driver_data(device
))
300 ac
= acpi_driver_data(device
);
303 power_supply_unregister(&ac
->charger
);
304 unregister_acpi_notifier(&ac
->battery_nb
);
311 static int __init
acpi_ac_init(void)
318 result
= acpi_bus_register_driver(&acpi_ac_driver
);
325 static void __exit
acpi_ac_exit(void)
327 acpi_bus_unregister_driver(&acpi_ac_driver
);
329 module_init(acpi_ac_init
);
330 module_exit(acpi_ac_exit
);