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Merge branch 'flock' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
[net-next-2.6.git] / drivers / acpi / battery.c
CommitLineData
1da177e4 1/*
aa650bbd 2 * battery.c - ACPI Battery Driver (Revision: 2.0)
1da177e4 3 *
aa650bbd
AS		 4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
1da177e4
LT		 6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 *
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 */
27
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/types.h>
f1d4661a 32#include <linux/jiffies.h>
0f66af53 33#include <linux/async.h>
bc76f90b 34#include <linux/dmi.h>
5a0e3ad6 35#include <linux/slab.h>
d7380965 36
fdcedbba 37#ifdef CONFIG_ACPI_PROCFS_POWER
1da177e4
LT		 38#include <linux/proc_fs.h>
39#include <linux/seq_file.h>
40#include <asm/uaccess.h>
d7380965 41#endif
1da177e4
LT		 42
43#include <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
d7380965
AS		 45#include <linux/power_supply.h>
46
a192a958
LB		 47#define PREFIX "ACPI: "
48
1da177e4
LT		 49#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
50
1da177e4 51#define ACPI_BATTERY_CLASS "battery"
1da177e4 52#define ACPI_BATTERY_DEVICE_NAME "Battery"
1da177e4
LT		 53#define ACPI_BATTERY_NOTIFY_STATUS 0x80
54#define ACPI_BATTERY_NOTIFY_INFO 0x81
c67fcd67 55#define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
1da177e4 56
1da177e4 57#define _COMPONENT ACPI_BATTERY_COMPONENT
b6ce4083 58
f52fd66d 59ACPI_MODULE_NAME("battery");
1da177e4 60
f52fd66d 61MODULE_AUTHOR("Paul Diefenbaugh");
aa650bbd 62MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
7cda93e0 63MODULE_DESCRIPTION("ACPI Battery Driver");
1da177e4
LT		 64MODULE_LICENSE("GPL");
65
f1d4661a
AS		 66static unsigned int cache_time = 1000;
67module_param(cache_time, uint, 0644);
68MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
b6ce4083 69
fdcedbba 70#ifdef CONFIG_ACPI_PROCFS_POWER
3f86b832
RT		 71extern struct proc_dir_entry *acpi_lock_battery_dir(void);
72extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
73
d7380965
AS		 74enum acpi_battery_files {
75 info_tag = 0,
76 state_tag,
77 alarm_tag,
78 ACPI_BATTERY_NUMFILES,
79};
80
81#endif
82
1ba90e3a
TR		 83static const struct acpi_device_id battery_device_ids[] = {
84 {"PNP0C0A", 0},
85 {"", 0},
86};
1ba90e3a 87
aa650bbd 88MODULE_DEVICE_TABLE(acpi, battery_device_ids);
1da177e4 89
7b3bcc4a
AS		 90enum {
91 ACPI_BATTERY_ALARM_PRESENT,
c67fcd67
AS		 92 ACPI_BATTERY_XINFO_PRESENT,
93 /* For buggy DSDTs that report negative 16-bit values for either
94 * charging or discharging current and/or report 0 as 65536
95 * due to bad math.
96 */
7b3bcc4a 97 ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
557d5868 98 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
7b3bcc4a 99};
78490d82 100
1da177e4 101struct acpi_battery {
038fdea2 102 struct mutex lock;
d7380965 103 struct power_supply bat;
f1d4661a
AS		 104 struct acpi_device *device;
105 unsigned long update_time;
7faa144a 106 int rate_now;
d7380965
AS		 107 int capacity_now;
108 int voltage_now;
038fdea2 109 int design_capacity;
d7380965 110 int full_charge_capacity;
038fdea2
AS		 111 int technology;
112 int design_voltage;
113 int design_capacity_warning;
114 int design_capacity_low;
c67fcd67
AS		 115 int cycle_count;
116 int measurement_accuracy;
117 int max_sampling_time;
118 int min_sampling_time;
119 int max_averaging_interval;
120 int min_averaging_interval;
038fdea2
AS		 121 int capacity_granularity_1;
122 int capacity_granularity_2;
f1d4661a 123 int alarm;
038fdea2
AS		 124 char model_number[32];
125 char serial_number[32];
126 char type[32];
127 char oem_info[32];
f1d4661a
AS		 128 int state;
129 int power_unit;
7b3bcc4a 130 unsigned long flags;
1da177e4
LT		 131};
132
d7380965
AS		 133#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
134
78490d82 135inline int acpi_battery_present(struct acpi_battery *battery)
b6ce4083 136{
78490d82
AS		 137 return battery->device->status.battery_present;
138}
038fdea2 139
d7380965
AS		 140static int acpi_battery_technology(struct acpi_battery *battery)
141{
142 if (!strcasecmp("NiCd", battery->type))
143 return POWER_SUPPLY_TECHNOLOGY_NiCd;
144 if (!strcasecmp("NiMH", battery->type))
145 return POWER_SUPPLY_TECHNOLOGY_NiMH;
146 if (!strcasecmp("LION", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_LION;
ad40e68b 148 if (!strncasecmp("LI-ION", battery->type, 6))
0bde7eee 149 return POWER_SUPPLY_TECHNOLOGY_LION;
d7380965
AS		 150 if (!strcasecmp("LiP", battery->type))
151 return POWER_SUPPLY_TECHNOLOGY_LIPO;
152 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
153}
154
9104476e 155static int acpi_battery_get_state(struct acpi_battery *battery);
b19073a0 156
56f382a0
RH		 157static int acpi_battery_is_charged(struct acpi_battery *battery)
158{
159 /* either charging or discharging */
160 if (battery->state != 0)
161 return 0;
162
163 /* battery not reporting charge */
164 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
165 battery->capacity_now == 0)
166 return 0;
167
168 /* good batteries update full_charge as the batteries degrade */
169 if (battery->full_charge_capacity == battery->capacity_now)
170 return 1;
171
172 /* fallback to using design values for broken batteries */
173 if (battery->design_capacity == battery->capacity_now)
174 return 1;
175
176 /* we don't do any sort of metric based on percentages */
177 return 0;
178}
179
d7380965
AS		 180static int acpi_battery_get_property(struct power_supply *psy,
181 enum power_supply_property psp,
182 union power_supply_propval *val)
183{
a1b4bd69 184 int ret = 0;
d7380965
AS		 185 struct acpi_battery *battery = to_acpi_battery(psy);
186
9104476e
AS		 187 if (acpi_battery_present(battery)) {
188 /* run battery update only if it is present */
189 acpi_battery_get_state(battery);
190 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
d7380965
AS		 191 return -ENODEV;
192 switch (psp) {
193 case POWER_SUPPLY_PROP_STATUS:
194 if (battery->state & 0x01)
195 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
196 else if (battery->state & 0x02)
197 val->intval = POWER_SUPPLY_STATUS_CHARGING;
56f382a0 198 else if (acpi_battery_is_charged(battery))
d7380965 199 val->intval = POWER_SUPPLY_STATUS_FULL;
4c41d3ad
RD		 200 else
201 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
d7380965
AS		 202 break;
203 case POWER_SUPPLY_PROP_PRESENT:
204 val->intval = acpi_battery_present(battery);
205 break;
206 case POWER_SUPPLY_PROP_TECHNOLOGY:
207 val->intval = acpi_battery_technology(battery);
208 break;
c67fcd67
AS		 209 case POWER_SUPPLY_PROP_CYCLE_COUNT:
210 val->intval = battery->cycle_count;
211 break;
d7380965 212 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
a1b4bd69
RW		 213 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
214 ret = -ENODEV;
215 else
216 val->intval = battery->design_voltage * 1000;
d7380965
AS		 217 break;
218 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
a1b4bd69
RW		 219 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
220 ret = -ENODEV;
221 else
222 val->intval = battery->voltage_now * 1000;
d7380965
AS		 223 break;
224 case POWER_SUPPLY_PROP_CURRENT_NOW:
7faa144a 225 case POWER_SUPPLY_PROP_POWER_NOW:
a1b4bd69
RW		 226 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
227 ret = -ENODEV;
228 else
229 val->intval = battery->rate_now * 1000;
d7380965
AS		 230 break;
231 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
232 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
a1b4bd69
RW		 233 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
234 ret = -ENODEV;
235 else
236 val->intval = battery->design_capacity * 1000;
d7380965
AS		 237 break;
238 case POWER_SUPPLY_PROP_CHARGE_FULL:
239 case POWER_SUPPLY_PROP_ENERGY_FULL:
a1b4bd69
RW		 240 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
241 ret = -ENODEV;
242 else
243 val->intval = battery->full_charge_capacity * 1000;
d7380965
AS		 244 break;
245 case POWER_SUPPLY_PROP_CHARGE_NOW:
246 case POWER_SUPPLY_PROP_ENERGY_NOW:
a1b4bd69
RW		 247 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
248 ret = -ENODEV;
249 else
250 val->intval = battery->capacity_now * 1000;
d7380965
AS		 251 break;
252 case POWER_SUPPLY_PROP_MODEL_NAME:
253 val->strval = battery->model_number;
254 break;
255 case POWER_SUPPLY_PROP_MANUFACTURER:
256 val->strval = battery->oem_info;
257 break;
7c2670bb 258 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
259 val->strval = battery->serial_number;
260 break;
d7380965 261 default:
a1b4bd69 262 ret = -EINVAL;
d7380965 263 }
a1b4bd69 264 return ret;
d7380965
AS		 265}
266
267static enum power_supply_property charge_battery_props[] = {
268 POWER_SUPPLY_PROP_STATUS,
269 POWER_SUPPLY_PROP_PRESENT,
270 POWER_SUPPLY_PROP_TECHNOLOGY,
c67fcd67 271 POWER_SUPPLY_PROP_CYCLE_COUNT,
d7380965
AS		 272 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
273 POWER_SUPPLY_PROP_VOLTAGE_NOW,
274 POWER_SUPPLY_PROP_CURRENT_NOW,
275 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
276 POWER_SUPPLY_PROP_CHARGE_FULL,
277 POWER_SUPPLY_PROP_CHARGE_NOW,
278 POWER_SUPPLY_PROP_MODEL_NAME,
279 POWER_SUPPLY_PROP_MANUFACTURER,
7c2670bb 280 POWER_SUPPLY_PROP_SERIAL_NUMBER,
d7380965
AS		 281};
282
283static enum power_supply_property energy_battery_props[] = {
284 POWER_SUPPLY_PROP_STATUS,
285 POWER_SUPPLY_PROP_PRESENT,
286 POWER_SUPPLY_PROP_TECHNOLOGY,
c67fcd67 287 POWER_SUPPLY_PROP_CYCLE_COUNT,
d7380965
AS		 288 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
289 POWER_SUPPLY_PROP_VOLTAGE_NOW,
7faa144a 290 POWER_SUPPLY_PROP_POWER_NOW,
d7380965
AS		 291 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
292 POWER_SUPPLY_PROP_ENERGY_FULL,
293 POWER_SUPPLY_PROP_ENERGY_NOW,
294 POWER_SUPPLY_PROP_MODEL_NAME,
295 POWER_SUPPLY_PROP_MANUFACTURER,
7c2670bb 296 POWER_SUPPLY_PROP_SERIAL_NUMBER,
d7380965
AS		 297};
298
fdcedbba 299#ifdef CONFIG_ACPI_PROCFS_POWER
f1d4661a 300inline char *acpi_battery_units(struct acpi_battery *battery)
78490d82 301{
f1d4661a 302 return (battery->power_unit)?"mA":"mW";
b6ce4083 303}
d7380965 304#endif
b6ce4083 305
78490d82
AS		 306/* --------------------------------------------------------------------------
307 Battery Management
308 -------------------------------------------------------------------------- */
038fdea2
AS		 309struct acpi_offsets {
310 size_t offset; /* offset inside struct acpi_sbs_battery */
311 u8 mode; /* int or string? */
312};
b6ce4083 313
038fdea2
AS		 314static struct acpi_offsets state_offsets[] = {
315 {offsetof(struct acpi_battery, state), 0},
7faa144a 316 {offsetof(struct acpi_battery, rate_now), 0},
d7380965
AS		 317 {offsetof(struct acpi_battery, capacity_now), 0},
318 {offsetof(struct acpi_battery, voltage_now), 0},
038fdea2 319};
b6ce4083 320
038fdea2
AS		 321static struct acpi_offsets info_offsets[] = {
322 {offsetof(struct acpi_battery, power_unit), 0},
323 {offsetof(struct acpi_battery, design_capacity), 0},
d7380965 324 {offsetof(struct acpi_battery, full_charge_capacity), 0},
038fdea2
AS		 325 {offsetof(struct acpi_battery, technology), 0},
326 {offsetof(struct acpi_battery, design_voltage), 0},
327 {offsetof(struct acpi_battery, design_capacity_warning), 0},
328 {offsetof(struct acpi_battery, design_capacity_low), 0},
329 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
330 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
331 {offsetof(struct acpi_battery, model_number), 1},
332 {offsetof(struct acpi_battery, serial_number), 1},
333 {offsetof(struct acpi_battery, type), 1},
334 {offsetof(struct acpi_battery, oem_info), 1},
335};
b6ce4083 336
c67fcd67
AS		 337static struct acpi_offsets extended_info_offsets[] = {
338 {offsetof(struct acpi_battery, power_unit), 0},
339 {offsetof(struct acpi_battery, design_capacity), 0},
340 {offsetof(struct acpi_battery, full_charge_capacity), 0},
341 {offsetof(struct acpi_battery, technology), 0},
342 {offsetof(struct acpi_battery, design_voltage), 0},
343 {offsetof(struct acpi_battery, design_capacity_warning), 0},
344 {offsetof(struct acpi_battery, design_capacity_low), 0},
345 {offsetof(struct acpi_battery, cycle_count), 0},
346 {offsetof(struct acpi_battery, measurement_accuracy), 0},
347 {offsetof(struct acpi_battery, max_sampling_time), 0},
348 {offsetof(struct acpi_battery, min_sampling_time), 0},
349 {offsetof(struct acpi_battery, max_averaging_interval), 0},
350 {offsetof(struct acpi_battery, min_averaging_interval), 0},
351 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
352 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
353 {offsetof(struct acpi_battery, model_number), 1},
354 {offsetof(struct acpi_battery, serial_number), 1},
355 {offsetof(struct acpi_battery, type), 1},
356 {offsetof(struct acpi_battery, oem_info), 1},
357};
358
038fdea2
AS		 359static int extract_package(struct acpi_battery *battery,
360 union acpi_object *package,
361 struct acpi_offsets *offsets, int num)
362{
106449e8 363 int i;
038fdea2
AS		 364 union acpi_object *element;
365 if (package->type != ACPI_TYPE_PACKAGE)
366 return -EFAULT;
367 for (i = 0; i < num; ++i) {
368 if (package->package.count <= i)
369 return -EFAULT;
370 element = &package->package.elements[i];
371 if (offsets[i].mode) {
106449e8
AS		 372 u8 *ptr = (u8 *)battery + offsets[i].offset;
373 if (element->type == ACPI_TYPE_STRING ||
374 element->type == ACPI_TYPE_BUFFER)
375 strncpy(ptr, element->string.pointer, 32);
376 else if (element->type == ACPI_TYPE_INTEGER) {
377 strncpy(ptr, (u8 *)&element->integer.value,
439913ff
LM		 378 sizeof(u64));
379 ptr[sizeof(u64)] = 0;
b8a1bdb1
AS		 380 } else
381 *ptr = 0; /* don't have value */
038fdea2 382 } else {
b8a1bdb1
AS		 383 int *x = (int *)((u8 *)battery + offsets[i].offset);
384 *x = (element->type == ACPI_TYPE_INTEGER) ?
385 element->integer.value : -1;
038fdea2 386 }
b6ce4083 387 }
b6ce4083
VL		 388 return 0;
389}
390
391static int acpi_battery_get_status(struct acpi_battery *battery)
392{
aa650bbd 393 if (acpi_bus_get_status(battery->device)) {
b6ce4083
VL		 394 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
395 return -ENODEV;
396 }
aa650bbd 397 return 0;
b6ce4083
VL		 398}
399
400static int acpi_battery_get_info(struct acpi_battery *battery)
1da177e4 401{
aa650bbd 402 int result = -EFAULT;
4be44fcd 403 acpi_status status = 0;
c67fcd67
AS		 404 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
405 "_BIX" : "_BIF";
406
4be44fcd 407 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1da177e4 408
b6ce4083
VL		 409 if (!acpi_battery_present(battery))
410 return 0;
038fdea2 411 mutex_lock(&battery->lock);
c67fcd67
AS		 412 status = acpi_evaluate_object(battery->device->handle, name,
413 NULL, &buffer);
038fdea2 414 mutex_unlock(&battery->lock);
aa650bbd 415
1da177e4 416 if (ACPI_FAILURE(status)) {
c67fcd67 417 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
d550d98d 418 return -ENODEV;
1da177e4 419 }
c67fcd67
AS		 420 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
421 result = extract_package(battery, buffer.pointer,
422 extended_info_offsets,
423 ARRAY_SIZE(extended_info_offsets));
424 else
425 result = extract_package(battery, buffer.pointer,
426 info_offsets, ARRAY_SIZE(info_offsets));
78490d82 427 kfree(buffer.pointer);
557d5868
ZR		 428 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
429 battery->full_charge_capacity = battery->design_capacity;
d550d98d 430 return result;
1da177e4
LT		 431}
432
b6ce4083 433static int acpi_battery_get_state(struct acpi_battery *battery)
1da177e4 434{
4be44fcd
LB		 435 int result = 0;
436 acpi_status status = 0;
437 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1da177e4 438
b6ce4083
VL		 439 if (!acpi_battery_present(battery))
440 return 0;
1da177e4 441
f1d4661a
AS		 442 if (battery->update_time &&
443 time_before(jiffies, battery->update_time +
444 msecs_to_jiffies(cache_time)))
445 return 0;
446
038fdea2 447 mutex_lock(&battery->lock);
f1d4661a 448 status = acpi_evaluate_object(battery->device->handle, "_BST",
038fdea2
AS		 449 NULL, &buffer);
450 mutex_unlock(&battery->lock);
5b31d895 451
1da177e4 452 if (ACPI_FAILURE(status)) {
a6fc6720 453 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
d550d98d 454 return -ENODEV;
1da177e4 455 }
aa650bbd 456
038fdea2
AS		 457 result = extract_package(battery, buffer.pointer,
458 state_offsets, ARRAY_SIZE(state_offsets));
f1d4661a 459 battery->update_time = jiffies;
78490d82 460 kfree(buffer.pointer);
bc76f90b 461
7b3bcc4a 462 if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
bc76f90b
HM		 463 battery->rate_now != -1)
464 battery->rate_now = abs((s16)battery->rate_now);
465
557d5868
ZR		 466 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
467 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
468 battery->capacity_now = (battery->capacity_now *
469 battery->full_charge_capacity) / 100;
b6ce4083
VL		 470 return result;
471}
1da177e4 472
aa650bbd 473static int acpi_battery_set_alarm(struct acpi_battery *battery)
1da177e4 474{
4be44fcd 475 acpi_status status = 0;
aa650bbd 476 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
4be44fcd 477 struct acpi_object_list arg_list = { 1, &arg0 };
1da177e4 478
c67fcd67 479 if (!acpi_battery_present(battery) ||
7b3bcc4a 480 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
d550d98d 481 return -ENODEV;
1da177e4 482
aa650bbd 483 arg0.integer.value = battery->alarm;
1da177e4 484
038fdea2 485 mutex_lock(&battery->lock);
f1d4661a
AS		 486 status = acpi_evaluate_object(battery->device->handle, "_BTP",
487 &arg_list, NULL);
038fdea2 488 mutex_unlock(&battery->lock);
aa650bbd 489
1da177e4 490 if (ACPI_FAILURE(status))
d550d98d 491 return -ENODEV;
1da177e4 492
aa650bbd 493 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
d550d98d 494 return 0;
1da177e4
LT		 495}
496
b6ce4083 497static int acpi_battery_init_alarm(struct acpi_battery *battery)
1da177e4 498{
4be44fcd
LB		 499 acpi_status status = AE_OK;
500 acpi_handle handle = NULL;
4be44fcd 501
b6ce4083 502 /* See if alarms are supported, and if so, set default */
f1d4661a
AS		 503 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
504 if (ACPI_FAILURE(status)) {
7b3bcc4a 505 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
f1d4661a 506 return 0;
b6ce4083 507 }
7b3bcc4a 508 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
f1d4661a
AS		 509 if (!battery->alarm)
510 battery->alarm = battery->design_capacity_warning;
aa650bbd 511 return acpi_battery_set_alarm(battery);
b6ce4083 512}
1da177e4 513
508df92d
AB		 514static ssize_t acpi_battery_alarm_show(struct device *dev,
515 struct device_attribute *attr,
516 char *buf)
517{
518 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
519 return sprintf(buf, "%d\n", battery->alarm * 1000);
520}
521
522static ssize_t acpi_battery_alarm_store(struct device *dev,
523 struct device_attribute *attr,
524 const char *buf, size_t count)
525{
526 unsigned long x;
527 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
528 if (sscanf(buf, "%ld\n", &x) == 1)
529 battery->alarm = x/1000;
530 if (acpi_battery_present(battery))
531 acpi_battery_set_alarm(battery);
532 return count;
533}
534
535static struct device_attribute alarm_attr = {
01e8ef11 536 .attr = {.name = "alarm", .mode = 0644},
508df92d
AB		 537 .show = acpi_battery_alarm_show,
538 .store = acpi_battery_alarm_store,
539};
540
541static int sysfs_add_battery(struct acpi_battery *battery)
542{
543 int result;
544
508df92d
AB		 545 if (battery->power_unit) {
546 battery->bat.properties = charge_battery_props;
547 battery->bat.num_properties =
548 ARRAY_SIZE(charge_battery_props);
549 } else {
550 battery->bat.properties = energy_battery_props;
551 battery->bat.num_properties =
552 ARRAY_SIZE(energy_battery_props);
553 }
554
555 battery->bat.name = acpi_device_bid(battery->device);
556 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
557 battery->bat.get_property = acpi_battery_get_property;
558
559 result = power_supply_register(&battery->device->dev, &battery->bat);
560 if (result)
561 return result;
562 return device_create_file(battery->bat.dev, &alarm_attr);
563}
564
565static void sysfs_remove_battery(struct acpi_battery *battery)
566{
567 if (!battery->bat.dev)
568 return;
569 device_remove_file(battery->bat.dev, &alarm_attr);
570 power_supply_unregister(&battery->bat);
9104476e 571 battery->bat.dev = NULL;
508df92d
AB		 572}
573
bc76f90b
HM		 574static void acpi_battery_quirks(struct acpi_battery *battery)
575{
bc76f90b 576 if (dmi_name_in_vendors("Acer") && battery->power_unit) {
7b3bcc4a 577 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
bc76f90b
HM		 578 }
579}
580
557d5868
ZR		 581/*
582 * According to the ACPI spec, some kinds of primary batteries can
583 * report percentage battery remaining capacity directly to OS.
584 * In this case, it reports the Last Full Charged Capacity == 100
585 * and BatteryPresentRate == 0xFFFFFFFF.
586 *
587 * Now we found some battery reports percentage remaining capacity
588 * even if it's rechargeable.
589 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
590 *
591 * Handle this correctly so that they won't break userspace.
592 */
593static void acpi_battery_quirks2(struct acpi_battery *battery)
594{
595 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
596 return ;
597
598 if (battery->full_charge_capacity == 100 &&
599 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
600 battery->capacity_now >=0 && battery->capacity_now <= 100) {
601 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
602 battery->full_charge_capacity = battery->design_capacity;
603 battery->capacity_now = (battery->capacity_now *
604 battery->full_charge_capacity) / 100;
605 }
606}
607
f1d4661a 608static int acpi_battery_update(struct acpi_battery *battery)
b6ce4083 609{
50b17851 610 int result, old_present = acpi_battery_present(battery);
97749cd9 611 result = acpi_battery_get_status(battery);
508df92d 612 if (result)
b6ce4083 613 return result;
508df92d
AB		 614 if (!acpi_battery_present(battery)) {
615 sysfs_remove_battery(battery);
97749cd9 616 battery->update_time = 0;
508df92d 617 return 0;
b6ce4083 618 }
50b17851
AS		 619 if (!battery->update_time ||
620 old_present != acpi_battery_present(battery)) {
97749cd9
AS		 621 result = acpi_battery_get_info(battery);
622 if (result)
623 return result;
bc76f90b 624 acpi_battery_quirks(battery);
97749cd9
AS		 625 acpi_battery_init_alarm(battery);
626 }
508df92d
AB		 627 if (!battery->bat.dev)
628 sysfs_add_battery(battery);
557d5868
ZR		 629 result = acpi_battery_get_state(battery);
630 acpi_battery_quirks2(battery);
631 return result;
4bd35cdb
VL		 632}
633
1da177e4
LT		 634/* --------------------------------------------------------------------------
635 FS Interface (/proc)
636 -------------------------------------------------------------------------- */
637
fdcedbba 638#ifdef CONFIG_ACPI_PROCFS_POWER
4be44fcd 639static struct proc_dir_entry *acpi_battery_dir;
b6ce4083 640
78490d82 641static int acpi_battery_print_info(struct seq_file *seq, int result)
1da177e4 642{
50dd0969 643 struct acpi_battery *battery = seq->private;
1da177e4 644
b6ce4083 645 if (result)
1da177e4
LT		 646 goto end;
647
aa650bbd
AS		 648 seq_printf(seq, "present: %s\n",
649 acpi_battery_present(battery)?"yes":"no");
650 if (!acpi_battery_present(battery))
1da177e4 651 goto end;
038fdea2 652 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
1da177e4
LT		 653 seq_printf(seq, "design capacity: unknown\n");
654 else
655 seq_printf(seq, "design capacity: %d %sh\n",
aa650bbd
AS		 656 battery->design_capacity,
657 acpi_battery_units(battery));
1da177e4 658
d7380965 659 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
1da177e4
LT		 660 seq_printf(seq, "last full capacity: unknown\n");
661 else
662 seq_printf(seq, "last full capacity: %d %sh\n",
d7380965 663 battery->full_charge_capacity,
aa650bbd
AS		 664 acpi_battery_units(battery));
665
666 seq_printf(seq, "battery technology: %srechargeable\n",
667 (!battery->technology)?"non-":"");
1da177e4 668
038fdea2 669 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
1da177e4
LT		 670 seq_printf(seq, "design voltage: unknown\n");
671 else
672 seq_printf(seq, "design voltage: %d mV\n",
aa650bbd 673 battery->design_voltage);
1da177e4 674 seq_printf(seq, "design capacity warning: %d %sh\n",
aa650bbd
AS		 675 battery->design_capacity_warning,
676 acpi_battery_units(battery));
1da177e4 677 seq_printf(seq, "design capacity low: %d %sh\n",
aa650bbd
AS		 678 battery->design_capacity_low,
679 acpi_battery_units(battery));
c67fcd67 680 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
1da177e4 681 seq_printf(seq, "capacity granularity 1: %d %sh\n",
aa650bbd
AS		 682 battery->capacity_granularity_1,
683 acpi_battery_units(battery));
1da177e4 684 seq_printf(seq, "capacity granularity 2: %d %sh\n",
aa650bbd
AS		 685 battery->capacity_granularity_2,
686 acpi_battery_units(battery));
038fdea2
AS		 687 seq_printf(seq, "model number: %s\n", battery->model_number);
688 seq_printf(seq, "serial number: %s\n", battery->serial_number);
689 seq_printf(seq, "battery type: %s\n", battery->type);
690 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
4be44fcd 691 end:
b6ce4083
VL		 692 if (result)
693 seq_printf(seq, "ERROR: Unable to read battery info\n");
b6ce4083
VL		 694 return result;
695}
696
78490d82 697static int acpi_battery_print_state(struct seq_file *seq, int result)
1da177e4 698{
50dd0969 699 struct acpi_battery *battery = seq->private;
1da177e4 700
b6ce4083 701 if (result)
1da177e4
LT		 702 goto end;
703
aa650bbd
AS		 704 seq_printf(seq, "present: %s\n",
705 acpi_battery_present(battery)?"yes":"no");
706 if (!acpi_battery_present(battery))
1da177e4 707 goto end;
b6ce4083 708
aa650bbd
AS		 709 seq_printf(seq, "capacity state: %s\n",
710 (battery->state & 0x04)?"critical":"ok");
711 if ((battery->state & 0x01) && (battery->state & 0x02))
4be44fcd
LB		 712 seq_printf(seq,
713 "charging state: charging/discharging\n");
aa650bbd 714 else if (battery->state & 0x01)
1da177e4 715 seq_printf(seq, "charging state: discharging\n");
038fdea2 716 else if (battery->state & 0x02)
1da177e4 717 seq_printf(seq, "charging state: charging\n");
aa650bbd 718 else
1da177e4 719 seq_printf(seq, "charging state: charged\n");
1da177e4 720
7faa144a 721 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
1da177e4
LT		 722 seq_printf(seq, "present rate: unknown\n");
723 else
724 seq_printf(seq, "present rate: %d %s\n",
7faa144a 725 battery->rate_now, acpi_battery_units(battery));
1da177e4 726
d7380965 727 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
1da177e4
LT		 728 seq_printf(seq, "remaining capacity: unknown\n");
729 else
730 seq_printf(seq, "remaining capacity: %d %sh\n",
d7380965
AS		 731 battery->capacity_now, acpi_battery_units(battery));
732 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
1da177e4
LT		 733 seq_printf(seq, "present voltage: unknown\n");
734 else
735 seq_printf(seq, "present voltage: %d mV\n",
d7380965 736 battery->voltage_now);
4be44fcd 737 end:
aa650bbd 738 if (result)
b6ce4083 739 seq_printf(seq, "ERROR: Unable to read battery state\n");
b6ce4083
VL		 740
741 return result;
742}
743
78490d82 744static int acpi_battery_print_alarm(struct seq_file *seq, int result)
1da177e4 745{
50dd0969 746 struct acpi_battery *battery = seq->private;
1da177e4 747
b6ce4083 748 if (result)
1da177e4
LT		 749 goto end;
750
b6ce4083 751 if (!acpi_battery_present(battery)) {
1da177e4
LT		 752 seq_printf(seq, "present: no\n");
753 goto end;
754 }
1da177e4
LT		 755 seq_printf(seq, "alarm: ");
756 if (!battery->alarm)
757 seq_printf(seq, "unsupported\n");
758 else
aa650bbd
AS		 759 seq_printf(seq, "%u %sh\n", battery->alarm,
760 acpi_battery_units(battery));
4be44fcd 761 end:
b6ce4083
VL		 762 if (result)
763 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
b6ce4083
VL		 764 return result;
765}
766
f1d4661a
AS		 767static ssize_t acpi_battery_write_alarm(struct file *file,
768 const char __user * buffer,
769 size_t count, loff_t * ppos)
1da177e4 770{
4be44fcd
LB		 771 int result = 0;
772 char alarm_string[12] = { '\0' };
50dd0969
JE		 773 struct seq_file *m = file->private_data;
774 struct acpi_battery *battery = m->private;
1da177e4 775
1da177e4 776 if (!battery || (count > sizeof(alarm_string) - 1))
d550d98d 777 return -EINVAL;
b6ce4083
VL		 778 if (!acpi_battery_present(battery)) {
779 result = -ENODEV;
780 goto end;
781 }
b6ce4083
VL		 782 if (copy_from_user(alarm_string, buffer, count)) {
783 result = -EFAULT;
784 goto end;
785 }
1da177e4 786 alarm_string[count] = '\0';
f1d4661a 787 battery->alarm = simple_strtol(alarm_string, NULL, 0);
aa650bbd 788 result = acpi_battery_set_alarm(battery);
b6ce4083 789 end:
b6ce4083 790 if (!result)
f1d4661a 791 return count;
78490d82
AS		 792 return result;
793}
794
795typedef int(*print_func)(struct seq_file *seq, int result);
aa650bbd
AS		 796
797static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
798 acpi_battery_print_info,
799 acpi_battery_print_state,
800 acpi_battery_print_alarm,
78490d82 801};
b6ce4083 802
78490d82
AS		 803static int acpi_battery_read(int fid, struct seq_file *seq)
804{
805 struct acpi_battery *battery = seq->private;
f1d4661a 806 int result = acpi_battery_update(battery);
aa650bbd 807 return acpi_print_funcs[fid](seq, result);
78490d82
AS		 808}
809
aa650bbd
AS		 810#define DECLARE_FILE_FUNCTIONS(_name) \
811static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
812{ \
813 return acpi_battery_read(_name##_tag, seq); \
814} \
815static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
816{ \
817 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
78490d82
AS		 818}
819
aa650bbd
AS		 820DECLARE_FILE_FUNCTIONS(info);
821DECLARE_FILE_FUNCTIONS(state);
822DECLARE_FILE_FUNCTIONS(alarm);
823
824#undef DECLARE_FILE_FUNCTIONS
825
826#define FILE_DESCRIPTION_RO(_name) \
827 { \
828 .name = __stringify(_name), \
829 .mode = S_IRUGO, \
830 .ops = { \
831 .open = acpi_battery_##_name##_open_fs, \
832 .read = seq_read, \
833 .llseek = seq_lseek, \
834 .release = single_release, \
835 .owner = THIS_MODULE, \
836 }, \
837 }
78490d82 838
aa650bbd
AS		 839#define FILE_DESCRIPTION_RW(_name) \
840 { \
841 .name = __stringify(_name), \
842 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
843 .ops = { \
844 .open = acpi_battery_##_name##_open_fs, \
845 .read = seq_read, \
846 .llseek = seq_lseek, \
847 .write = acpi_battery_write_##_name, \
848 .release = single_release, \
849 .owner = THIS_MODULE, \
850 }, \
851 }
1da177e4 852
78490d82
AS		 853static struct battery_file {
854 struct file_operations ops;
855 mode_t mode;
070d8eb1 856 const char *name;
78490d82 857} acpi_battery_file[] = {
aa650bbd
AS		 858 FILE_DESCRIPTION_RO(info),
859 FILE_DESCRIPTION_RO(state),
860 FILE_DESCRIPTION_RW(alarm),
1da177e4
LT		 861};
862
aa650bbd
AS		 863#undef FILE_DESCRIPTION_RO
864#undef FILE_DESCRIPTION_RW
865
4be44fcd 866static int acpi_battery_add_fs(struct acpi_device *device)
1da177e4 867{
4be44fcd 868 struct proc_dir_entry *entry = NULL;
78490d82 869 int i;
1da177e4 870
1da177e4
LT		 871 if (!acpi_device_dir(device)) {
872 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
4be44fcd 873 acpi_battery_dir);
1da177e4 874 if (!acpi_device_dir(device))
d550d98d 875 return -ENODEV;
1da177e4
LT		 876 }
877
78490d82 878 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
cf7acfab
DL		 879 entry = proc_create_data(acpi_battery_file[i].name,
880 acpi_battery_file[i].mode,
881 acpi_device_dir(device),
882 &acpi_battery_file[i].ops,
883 acpi_driver_data(device));
78490d82
AS		 884 if (!entry)
885 return -ENODEV;
1da177e4 886 }
d550d98d 887 return 0;
1da177e4
LT		 888}
889
aa650bbd 890static void acpi_battery_remove_fs(struct acpi_device *device)
1da177e4 891{
78490d82 892 int i;
aa650bbd
AS		 893 if (!acpi_device_dir(device))
894 return;
895 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
896 remove_proc_entry(acpi_battery_file[i].name,
1da177e4 897 acpi_device_dir(device));
1da177e4 898
aa650bbd
AS		 899 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
900 acpi_device_dir(device) = NULL;
1da177e4
LT		 901}
902
d7380965 903#endif
3e58ea0d 904
1da177e4
LT		 905/* --------------------------------------------------------------------------
906 Driver Interface
907 -------------------------------------------------------------------------- */
908
d9406691 909static void acpi_battery_notify(struct acpi_device *device, u32 event)
1da177e4 910{
d9406691 911 struct acpi_battery *battery = acpi_driver_data(device);
153e500f 912 struct device *old;
d9406691 913
1da177e4 914 if (!battery)
d550d98d 915 return;
153e500f 916 old = battery->bat.dev;
f1d4661a
AS		 917 acpi_battery_update(battery);
918 acpi_bus_generate_proc_event(device, event,
919 acpi_battery_present(battery));
920 acpi_bus_generate_netlink_event(device->pnp.device_class,
0794469d 921 dev_name(&device->dev), event,
9ea7d575 922 acpi_battery_present(battery));
2345baf4 923 /* acpi_battery_update could remove power_supply object */
153e500f 924 if (old && battery->bat.dev)
f79e1cec 925 power_supply_changed(&battery->bat);
1da177e4
LT		 926}
927
4be44fcd 928static int acpi_battery_add(struct acpi_device *device)
1da177e4 929{
4be44fcd 930 int result = 0;
4be44fcd 931 struct acpi_battery *battery = NULL;
c67fcd67 932 acpi_handle handle;
1da177e4 933 if (!device)
d550d98d 934 return -EINVAL;
36bcbec7 935 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1da177e4 936 if (!battery)
d550d98d 937 return -ENOMEM;
145def84 938 battery->device = device;
1da177e4
LT		 939 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
940 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
db89b4f0 941 device->driver_data = battery;
038fdea2 942 mutex_init(&battery->lock);
c67fcd67
AS		 943 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
944 "_BIX", &handle)))
945 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
f1d4661a 946 acpi_battery_update(battery);
fdcedbba 947#ifdef CONFIG_ACPI_PROCFS_POWER
1da177e4 948 result = acpi_battery_add_fs(device);
d7380965 949#endif
586caae3
LB		 950 if (!result) {
951 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
952 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
953 device->status.battery_present ? "present" : "absent");
954 } else {
fdcedbba 955#ifdef CONFIG_ACPI_PROCFS_POWER
1da177e4 956 acpi_battery_remove_fs(device);
d7380965 957#endif
1da177e4
LT		 958 kfree(battery);
959 }
d550d98d 960 return result;
1da177e4
LT		 961}
962
4be44fcd 963static int acpi_battery_remove(struct acpi_device *device, int type)
1da177e4 964{
4be44fcd 965 struct acpi_battery *battery = NULL;
1da177e4 966
1da177e4 967 if (!device || !acpi_driver_data(device))
d550d98d 968 return -EINVAL;
50dd0969 969 battery = acpi_driver_data(device);
fdcedbba 970#ifdef CONFIG_ACPI_PROCFS_POWER
1da177e4 971 acpi_battery_remove_fs(device);
d7380965 972#endif
508df92d 973 sysfs_remove_battery(battery);
038fdea2 974 mutex_destroy(&battery->lock);
1da177e4 975 kfree(battery);
d550d98d 976 return 0;
1da177e4
LT		 977}
978
34c4415a 979/* this is needed to learn about changes made in suspended state */
5d9464a4 980static int acpi_battery_resume(struct acpi_device *device)
34c4415a
JK		 981{
982 struct acpi_battery *battery;
34c4415a
JK		 983 if (!device)
984 return -EINVAL;
f1d4661a
AS		 985 battery = acpi_driver_data(device);
986 battery->update_time = 0;
508df92d 987 acpi_battery_update(battery);
b6ce4083 988 return 0;
34c4415a
JK		 989}
990
aa650bbd
AS		 991static struct acpi_driver acpi_battery_driver = {
992 .name = "battery",
993 .class = ACPI_BATTERY_CLASS,
994 .ids = battery_device_ids,
d9406691 995 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
aa650bbd
AS		 996 .ops = {
997 .add = acpi_battery_add,
998 .resume = acpi_battery_resume,
999 .remove = acpi_battery_remove,
d9406691 1000 .notify = acpi_battery_notify,
aa650bbd
AS		 1001 },
1002};
1003
b0cbc861 1004static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1da177e4 1005{
4d8316d5 1006 if (acpi_disabled)
0f66af53 1007 return;
fdcedbba 1008#ifdef CONFIG_ACPI_PROCFS_POWER
3f86b832 1009 acpi_battery_dir = acpi_lock_battery_dir();
1da177e4 1010 if (!acpi_battery_dir)
0f66af53 1011 return;
d7380965 1012#endif
aa650bbd 1013 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
fdcedbba 1014#ifdef CONFIG_ACPI_PROCFS_POWER
3f86b832 1015 acpi_unlock_battery_dir(acpi_battery_dir);
d7380965 1016#endif
0f66af53 1017 return;
1da177e4 1018 }
0f66af53
AV		 1019 return;
1020}
1021
1022static int __init acpi_battery_init(void)
1023{
1024 async_schedule(acpi_battery_init_async, NULL);
d550d98d 1025 return 0;
1da177e4
LT		 1026}
1027
4be44fcd 1028static void __exit acpi_battery_exit(void)
1da177e4 1029{
1da177e4 1030 acpi_bus_unregister_driver(&acpi_battery_driver);
fdcedbba 1031#ifdef CONFIG_ACPI_PROCFS_POWER
3f86b832 1032 acpi_unlock_battery_dir(acpi_battery_dir);
d7380965 1033#endif
1da177e4
LT		 1034}
1035
1da177e4
LT		 1036module_init(acpi_battery_init);
1037module_exit(acpi_battery_exit);
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