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 <acpi/acpi_bus.h>
36 #include <acpi/acpi_drivers.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
;
63 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
65 /* --------------------------------------------------------------------------
67 -------------------------------------------------------------------------- */
69 static int acpi_ac_get_state(struct acpi_ac
*ac
)
72 acpi_handle handle
= ACPI_HANDLE(&ac
->pdev
->dev
);
74 status
= acpi_evaluate_integer(handle
, "_PSR", NULL
,
76 if (ACPI_FAILURE(status
)) {
77 ACPI_EXCEPTION((AE_INFO
, status
,
78 "Error reading AC Adapter state"));
79 ac
->state
= ACPI_AC_STATUS_UNKNOWN
;
86 /* --------------------------------------------------------------------------
88 -------------------------------------------------------------------------- */
89 static int get_ac_property(struct power_supply
*psy
,
90 enum power_supply_property psp
,
91 union power_supply_propval
*val
)
93 struct acpi_ac
*ac
= to_acpi_ac(psy
);
98 if (acpi_ac_get_state(ac
))
102 case POWER_SUPPLY_PROP_ONLINE
:
103 val
->intval
= ac
->state
;
111 static enum power_supply_property ac_props
[] = {
112 POWER_SUPPLY_PROP_ONLINE
,
115 /* --------------------------------------------------------------------------
117 -------------------------------------------------------------------------- */
119 static void acpi_ac_notify_handler(acpi_handle handle
, u32 event
, void *data
)
121 struct acpi_ac
*ac
= data
;
122 struct acpi_device
*adev
;
129 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
130 "Unsupported event [0x%x]\n", event
));
131 case ACPI_AC_NOTIFY_STATUS
:
132 case ACPI_NOTIFY_BUS_CHECK
:
133 case ACPI_NOTIFY_DEVICE_CHECK
:
135 * A buggy BIOS may notify AC first and then sleep for
136 * a specific time before doing actual operations in the
137 * EC event handler (_Qxx). This will cause the AC state
138 * reported by the ACPI event to be incorrect, so wait for a
139 * specific time for the EC event handler to make progress.
141 if (ac_sleep_before_get_state_ms
> 0)
142 msleep(ac_sleep_before_get_state_ms
);
144 acpi_ac_get_state(ac
);
145 adev
= ACPI_COMPANION(&ac
->pdev
->dev
);
146 acpi_bus_generate_netlink_event(adev
->pnp
.device_class
,
147 dev_name(&ac
->pdev
->dev
),
148 event
, (u32
) ac
->state
);
149 acpi_notifier_call_chain(adev
, event
, (u32
) ac
->state
);
150 kobject_uevent(&ac
->charger
.dev
->kobj
, KOBJ_CHANGE
);
156 static int thinkpad_e530_quirk(const struct dmi_system_id
*d
)
158 ac_sleep_before_get_state_ms
= 1000;
162 static struct dmi_system_id ac_dmi_table
[] = {
164 .callback
= thinkpad_e530_quirk
,
165 .ident
= "thinkpad e530",
167 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
168 DMI_MATCH(DMI_PRODUCT_NAME
, "32597CG"),
174 static int acpi_ac_probe(struct platform_device
*pdev
)
177 struct acpi_ac
*ac
= NULL
;
178 struct acpi_device
*adev
;
183 adev
= ACPI_COMPANION(&pdev
->dev
);
187 ac
= kzalloc(sizeof(struct acpi_ac
), GFP_KERNEL
);
191 strcpy(acpi_device_name(adev
), ACPI_AC_DEVICE_NAME
);
192 strcpy(acpi_device_class(adev
), ACPI_AC_CLASS
);
194 platform_set_drvdata(pdev
, ac
);
196 result
= acpi_ac_get_state(ac
);
200 ac
->charger
.name
= acpi_device_bid(adev
);
201 ac
->charger
.type
= POWER_SUPPLY_TYPE_MAINS
;
202 ac
->charger
.properties
= ac_props
;
203 ac
->charger
.num_properties
= ARRAY_SIZE(ac_props
);
204 ac
->charger
.get_property
= get_ac_property
;
205 result
= power_supply_register(&pdev
->dev
, &ac
->charger
);
209 result
= acpi_install_notify_handler(ACPI_HANDLE(&pdev
->dev
),
210 ACPI_DEVICE_NOTIFY
, acpi_ac_notify_handler
, ac
);
212 power_supply_unregister(&ac
->charger
);
215 printk(KERN_INFO PREFIX
"%s [%s] (%s)\n",
216 acpi_device_name(adev
), acpi_device_bid(adev
),
217 ac
->state
? "on-line" : "off-line");
223 dmi_check_system(ac_dmi_table
);
227 #ifdef CONFIG_PM_SLEEP
228 static int acpi_ac_resume(struct device
*dev
)
236 ac
= platform_get_drvdata(to_platform_device(dev
));
240 old_state
= ac
->state
;
241 if (acpi_ac_get_state(ac
))
243 if (old_state
!= ac
->state
)
244 kobject_uevent(&ac
->charger
.dev
->kobj
, KOBJ_CHANGE
);
248 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops
, NULL
, acpi_ac_resume
);
250 static int acpi_ac_remove(struct platform_device
*pdev
)
257 acpi_remove_notify_handler(ACPI_HANDLE(&pdev
->dev
),
258 ACPI_DEVICE_NOTIFY
, acpi_ac_notify_handler
);
260 ac
= platform_get_drvdata(pdev
);
262 power_supply_unregister(&ac
->charger
);
269 static const struct acpi_device_id acpi_ac_match
[] = {
273 MODULE_DEVICE_TABLE(acpi
, acpi_ac_match
);
275 static struct platform_driver acpi_ac_driver
= {
276 .probe
= acpi_ac_probe
,
277 .remove
= acpi_ac_remove
,
280 .owner
= THIS_MODULE
,
281 .pm
= &acpi_ac_pm_ops
,
282 .acpi_match_table
= ACPI_PTR(acpi_ac_match
),
286 static int __init
acpi_ac_init(void)
293 result
= platform_driver_register(&acpi_ac_driver
);
300 static void __exit
acpi_ac_exit(void)
302 platform_driver_unregister(&acpi_ac_driver
);
304 module_init(acpi_ac_init
);
305 module_exit(acpi_ac_exit
);