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 ac_sleep_before_get_state_ms
;
58 struct power_supply charger
;
59 struct platform_device
*pdev
;
60 unsigned long long state
;
61 struct notifier_block battery_nb
;
64 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
66 /* --------------------------------------------------------------------------
68 -------------------------------------------------------------------------- */
70 static int acpi_ac_get_state(struct acpi_ac
*ac
)
73 acpi_handle handle
= ACPI_HANDLE(&ac
->pdev
->dev
);
75 status
= acpi_evaluate_integer(handle
, "_PSR", NULL
,
77 if (ACPI_FAILURE(status
)) {
78 ACPI_EXCEPTION((AE_INFO
, status
,
79 "Error reading AC Adapter state"));
80 ac
->state
= ACPI_AC_STATUS_UNKNOWN
;
87 /* --------------------------------------------------------------------------
89 -------------------------------------------------------------------------- */
90 static int get_ac_property(struct power_supply
*psy
,
91 enum power_supply_property psp
,
92 union power_supply_propval
*val
)
94 struct acpi_ac
*ac
= to_acpi_ac(psy
);
99 if (acpi_ac_get_state(ac
))
103 case POWER_SUPPLY_PROP_ONLINE
:
104 val
->intval
= ac
->state
;
112 static enum power_supply_property ac_props
[] = {
113 POWER_SUPPLY_PROP_ONLINE
,
116 /* --------------------------------------------------------------------------
118 -------------------------------------------------------------------------- */
120 static void acpi_ac_notify_handler(acpi_handle handle
, u32 event
, void *data
)
122 struct acpi_ac
*ac
= data
;
123 struct acpi_device
*adev
;
130 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
131 "Unsupported event [0x%x]\n", event
));
132 case ACPI_AC_NOTIFY_STATUS
:
133 case ACPI_NOTIFY_BUS_CHECK
:
134 case ACPI_NOTIFY_DEVICE_CHECK
:
136 * A buggy BIOS may notify AC first and then sleep for
137 * a specific time before doing actual operations in the
138 * EC event handler (_Qxx). This will cause the AC state
139 * reported by the ACPI event to be incorrect, so wait for a
140 * specific time for the EC event handler to make progress.
142 if (ac_sleep_before_get_state_ms
> 0)
143 msleep(ac_sleep_before_get_state_ms
);
145 acpi_ac_get_state(ac
);
146 adev
= ACPI_COMPANION(&ac
->pdev
->dev
);
147 acpi_bus_generate_netlink_event(adev
->pnp
.device_class
,
148 dev_name(&ac
->pdev
->dev
),
149 event
, (u32
) ac
->state
);
150 acpi_notifier_call_chain(adev
, event
, (u32
) ac
->state
);
151 kobject_uevent(&ac
->charger
.dev
->kobj
, KOBJ_CHANGE
);
157 static int acpi_ac_battery_notify(struct notifier_block
*nb
,
158 unsigned long action
, void *data
)
160 struct acpi_ac
*ac
= container_of(nb
, struct acpi_ac
, battery_nb
);
161 struct acpi_bus_event
*event
= (struct acpi_bus_event
*)data
;
164 * On HP Pavilion dv6-6179er AC status notifications aren't triggered
165 * when adapter is plugged/unplugged. However, battery status
166 * notifcations are triggered when battery starts charging or
167 * discharging. Re-reading AC status triggers lost AC notifications,
168 * if AC status has changed.
170 if (strcmp(event
->device_class
, ACPI_BATTERY_CLASS
) == 0 &&
171 event
->type
== ACPI_BATTERY_NOTIFY_STATUS
)
172 acpi_ac_get_state(ac
);
177 static int thinkpad_e530_quirk(const struct dmi_system_id
*d
)
179 ac_sleep_before_get_state_ms
= 1000;
183 static struct dmi_system_id ac_dmi_table
[] = {
185 .callback
= thinkpad_e530_quirk
,
186 .ident
= "thinkpad e530",
188 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
189 DMI_MATCH(DMI_PRODUCT_NAME
, "32597CG"),
195 static int acpi_ac_probe(struct platform_device
*pdev
)
198 struct acpi_ac
*ac
= NULL
;
199 struct acpi_device
*adev
;
204 adev
= ACPI_COMPANION(&pdev
->dev
);
208 ac
= kzalloc(sizeof(struct acpi_ac
), GFP_KERNEL
);
212 strcpy(acpi_device_name(adev
), ACPI_AC_DEVICE_NAME
);
213 strcpy(acpi_device_class(adev
), ACPI_AC_CLASS
);
215 platform_set_drvdata(pdev
, ac
);
217 result
= acpi_ac_get_state(ac
);
221 ac
->charger
.name
= acpi_device_bid(adev
);
222 ac
->charger
.type
= POWER_SUPPLY_TYPE_MAINS
;
223 ac
->charger
.properties
= ac_props
;
224 ac
->charger
.num_properties
= ARRAY_SIZE(ac_props
);
225 ac
->charger
.get_property
= get_ac_property
;
226 result
= power_supply_register(&pdev
->dev
, &ac
->charger
);
230 result
= acpi_install_notify_handler(ACPI_HANDLE(&pdev
->dev
),
231 ACPI_ALL_NOTIFY
, acpi_ac_notify_handler
, ac
);
233 power_supply_unregister(&ac
->charger
);
236 printk(KERN_INFO PREFIX
"%s [%s] (%s)\n",
237 acpi_device_name(adev
), acpi_device_bid(adev
),
238 ac
->state
? "on-line" : "off-line");
240 ac
->battery_nb
.notifier_call
= acpi_ac_battery_notify
;
241 register_acpi_notifier(&ac
->battery_nb
);
246 dmi_check_system(ac_dmi_table
);
250 #ifdef CONFIG_PM_SLEEP
251 static int acpi_ac_resume(struct device
*dev
)
259 ac
= platform_get_drvdata(to_platform_device(dev
));
263 old_state
= ac
->state
;
264 if (acpi_ac_get_state(ac
))
266 if (old_state
!= ac
->state
)
267 kobject_uevent(&ac
->charger
.dev
->kobj
, KOBJ_CHANGE
);
271 #define acpi_ac_resume NULL
273 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops
, NULL
, acpi_ac_resume
);
275 static int acpi_ac_remove(struct platform_device
*pdev
)
282 acpi_remove_notify_handler(ACPI_HANDLE(&pdev
->dev
),
283 ACPI_ALL_NOTIFY
, acpi_ac_notify_handler
);
285 ac
= platform_get_drvdata(pdev
);
287 power_supply_unregister(&ac
->charger
);
288 unregister_acpi_notifier(&ac
->battery_nb
);
295 static const struct acpi_device_id acpi_ac_match
[] = {
299 MODULE_DEVICE_TABLE(acpi
, acpi_ac_match
);
301 static struct platform_driver acpi_ac_driver
= {
302 .probe
= acpi_ac_probe
,
303 .remove
= acpi_ac_remove
,
306 .owner
= THIS_MODULE
,
307 .pm
= &acpi_ac_pm_ops
,
308 .acpi_match_table
= ACPI_PTR(acpi_ac_match
),
312 static int __init
acpi_ac_init(void)
319 result
= platform_driver_register(&acpi_ac_driver
);
326 static void __exit
acpi_ac_exit(void)
328 platform_driver_unregister(&acpi_ac_driver
);
330 module_init(acpi_ac_init
);
331 module_exit(acpi_ac_exit
);