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visorbus: switch from ioremap_cache to memremap
[linux/fpc-iii.git] / drivers / acpi / battery.c
blobb3628cc01a535991d7d4c864d44c5dd337f9ca8d
1 /*
2 * battery.c - ACPI Battery Driver (Revision: 2.0)
3 *
4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
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>
32 #include <linux/jiffies.h>
33 #include <linux/async.h>
34 #include <linux/dmi.h>
35 #include <linux/delay.h>
36 #include <linux/slab.h>
37 #include <linux/suspend.h>
38 #include <asm/unaligned.h>
39
40 #ifdef CONFIG_ACPI_PROCFS_POWER
41 #include <linux/proc_fs.h>
42 #include <linux/seq_file.h>
43 #include <asm/uaccess.h>
44 #endif
45
46 #include <linux/acpi.h>
47 #include <linux/power_supply.h>
48
49 #include "battery.h"
50
51 #define PREFIX "ACPI: "
52
53 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
54
55 #define ACPI_BATTERY_DEVICE_NAME "Battery"
56
57 /* Battery power unit: 0 means mW, 1 means mA */
58 #define ACPI_BATTERY_POWER_UNIT_MA 1
59
60 #define ACPI_BATTERY_STATE_DISCHARGING 0x1
61 #define ACPI_BATTERY_STATE_CHARGING 0x2
62 #define ACPI_BATTERY_STATE_CRITICAL 0x4
63
64 #define _COMPONENT ACPI_BATTERY_COMPONENT
65
66 ACPI_MODULE_NAME("battery");
67
68 MODULE_AUTHOR("Paul Diefenbaugh");
69 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
70 MODULE_DESCRIPTION("ACPI Battery Driver");
71 MODULE_LICENSE("GPL");
72
73 static async_cookie_t async_cookie;
74 static int battery_bix_broken_package;
75 static int battery_notification_delay_ms;
76 static unsigned int cache_time = 1000;
77 module_param(cache_time, uint, 0644);
78 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
79
80 #ifdef CONFIG_ACPI_PROCFS_POWER
81 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
82 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
83
84 enum acpi_battery_files {
85 info_tag = 0,
86 state_tag,
87 alarm_tag,
88 ACPI_BATTERY_NUMFILES,
89 };
90
91 #endif
92
93 static const struct acpi_device_id battery_device_ids[] = {
94 {"PNP0C0A", 0},
95 {"", 0},
96 };
97
98 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
99
100 enum {
101 ACPI_BATTERY_ALARM_PRESENT,
102 ACPI_BATTERY_XINFO_PRESENT,
103 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
104 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
105 switches between mWh and mAh depending on whether the system
106 is running on battery or not. When mAh is the unit, most
107 reported values are incorrect and need to be adjusted by
108 10000/design_voltage. Verified on x201, t410, t410s, and x220.
109 Pre-2010 and 2012 models appear to always report in mWh and
110 are thus unaffected (tested with t42, t61, t500, x200, x300,
111 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
112 the 2011 models that fixes the issue (tested on x220 with a
113 post-1.29 BIOS), but as of Nov. 2012, no such update is
114 available for the 2010 models. */
115 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
116 };
117
118 struct acpi_battery {
119 struct mutex lock;
120 struct mutex sysfs_lock;
121 struct power_supply *bat;
122 struct power_supply_desc bat_desc;
123 struct acpi_device *device;
124 struct notifier_block pm_nb;
125 unsigned long update_time;
126 int revision;
127 int rate_now;
128 int capacity_now;
129 int voltage_now;
130 int design_capacity;
131 int full_charge_capacity;
132 int technology;
133 int design_voltage;
134 int design_capacity_warning;
135 int design_capacity_low;
136 int cycle_count;
137 int measurement_accuracy;
138 int max_sampling_time;
139 int min_sampling_time;
140 int max_averaging_interval;
141 int min_averaging_interval;
142 int capacity_granularity_1;
143 int capacity_granularity_2;
144 int alarm;
145 char model_number[32];
146 char serial_number[32];
147 char type[32];
148 char oem_info[32];
149 int state;
150 int power_unit;
151 unsigned long flags;
152 };
153
154 #define to_acpi_battery(x) power_supply_get_drvdata(x)
155
156 static inline int acpi_battery_present(struct acpi_battery *battery)
157 {
158 return battery->device->status.battery_present;
159 }
160
161 static int acpi_battery_technology(struct acpi_battery *battery)
162 {
163 if (!strcasecmp("NiCd", battery->type))
164 return POWER_SUPPLY_TECHNOLOGY_NiCd;
165 if (!strcasecmp("NiMH", battery->type))
166 return POWER_SUPPLY_TECHNOLOGY_NiMH;
167 if (!strcasecmp("LION", battery->type))
168 return POWER_SUPPLY_TECHNOLOGY_LION;
169 if (!strncasecmp("LI-ION", battery->type, 6))
170 return POWER_SUPPLY_TECHNOLOGY_LION;
171 if (!strcasecmp("LiP", battery->type))
172 return POWER_SUPPLY_TECHNOLOGY_LIPO;
173 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
174 }
175
176 static int acpi_battery_get_state(struct acpi_battery *battery);
177
178 static int acpi_battery_is_charged(struct acpi_battery *battery)
179 {
180 /* charging, discharging or critical low */
181 if (battery->state != 0)
182 return 0;
183
184 /* battery not reporting charge */
185 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
186 battery->capacity_now == 0)
187 return 0;
188
189 /* good batteries update full_charge as the batteries degrade */
190 if (battery->full_charge_capacity == battery->capacity_now)
191 return 1;
192
193 /* fallback to using design values for broken batteries */
194 if (battery->design_capacity == battery->capacity_now)
195 return 1;
196
197 /* we don't do any sort of metric based on percentages */
198 return 0;
199 }
200
201 static int acpi_battery_get_property(struct power_supply *psy,
202 enum power_supply_property psp,
203 union power_supply_propval *val)
204 {
205 int ret = 0;
206 struct acpi_battery *battery = to_acpi_battery(psy);
207
208 if (acpi_battery_present(battery)) {
209 /* run battery update only if it is present */
210 acpi_battery_get_state(battery);
211 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
212 return -ENODEV;
213 switch (psp) {
214 case POWER_SUPPLY_PROP_STATUS:
215 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
216 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
217 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
218 val->intval = POWER_SUPPLY_STATUS_CHARGING;
219 else if (acpi_battery_is_charged(battery))
220 val->intval = POWER_SUPPLY_STATUS_FULL;
221 else
222 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
223 break;
224 case POWER_SUPPLY_PROP_PRESENT:
225 val->intval = acpi_battery_present(battery);
226 break;
227 case POWER_SUPPLY_PROP_TECHNOLOGY:
228 val->intval = acpi_battery_technology(battery);
229 break;
230 case POWER_SUPPLY_PROP_CYCLE_COUNT:
231 val->intval = battery->cycle_count;
232 break;
233 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
234 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
235 ret = -ENODEV;
236 else
237 val->intval = battery->design_voltage * 1000;
238 break;
239 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
240 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
241 ret = -ENODEV;
242 else
243 val->intval = battery->voltage_now * 1000;
244 break;
245 case POWER_SUPPLY_PROP_CURRENT_NOW:
246 case POWER_SUPPLY_PROP_POWER_NOW:
247 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
248 ret = -ENODEV;
249 else
250 val->intval = battery->rate_now * 1000;
251 break;
252 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
253 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
254 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
255 ret = -ENODEV;
256 else
257 val->intval = battery->design_capacity * 1000;
258 break;
259 case POWER_SUPPLY_PROP_CHARGE_FULL:
260 case POWER_SUPPLY_PROP_ENERGY_FULL:
261 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
262 ret = -ENODEV;
263 else
264 val->intval = battery->full_charge_capacity * 1000;
265 break;
266 case POWER_SUPPLY_PROP_CHARGE_NOW:
267 case POWER_SUPPLY_PROP_ENERGY_NOW:
268 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
269 ret = -ENODEV;
270 else
271 val->intval = battery->capacity_now * 1000;
272 break;
273 case POWER_SUPPLY_PROP_CAPACITY:
274 if (battery->capacity_now && battery->full_charge_capacity)
275 val->intval = battery->capacity_now * 100/
276 battery->full_charge_capacity;
277 else
278 val->intval = 0;
279 break;
280 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
281 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
282 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
283 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
284 (battery->capacity_now <= battery->alarm))
285 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
286 else if (acpi_battery_is_charged(battery))
287 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
288 else
289 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
290 break;
291 case POWER_SUPPLY_PROP_MODEL_NAME:
292 val->strval = battery->model_number;
293 break;
294 case POWER_SUPPLY_PROP_MANUFACTURER:
295 val->strval = battery->oem_info;
296 break;
297 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
298 val->strval = battery->serial_number;
299 break;
300 default:
301 ret = -EINVAL;
302 }
303 return ret;
304 }
305
306 static enum power_supply_property charge_battery_props[] = {
307 POWER_SUPPLY_PROP_STATUS,
308 POWER_SUPPLY_PROP_PRESENT,
309 POWER_SUPPLY_PROP_TECHNOLOGY,
310 POWER_SUPPLY_PROP_CYCLE_COUNT,
311 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
312 POWER_SUPPLY_PROP_VOLTAGE_NOW,
313 POWER_SUPPLY_PROP_CURRENT_NOW,
314 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
315 POWER_SUPPLY_PROP_CHARGE_FULL,
316 POWER_SUPPLY_PROP_CHARGE_NOW,
317 POWER_SUPPLY_PROP_CAPACITY,
318 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
319 POWER_SUPPLY_PROP_MODEL_NAME,
320 POWER_SUPPLY_PROP_MANUFACTURER,
321 POWER_SUPPLY_PROP_SERIAL_NUMBER,
322 };
323
324 static enum power_supply_property energy_battery_props[] = {
325 POWER_SUPPLY_PROP_STATUS,
326 POWER_SUPPLY_PROP_PRESENT,
327 POWER_SUPPLY_PROP_TECHNOLOGY,
328 POWER_SUPPLY_PROP_CYCLE_COUNT,
329 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
330 POWER_SUPPLY_PROP_VOLTAGE_NOW,
331 POWER_SUPPLY_PROP_POWER_NOW,
332 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
333 POWER_SUPPLY_PROP_ENERGY_FULL,
334 POWER_SUPPLY_PROP_ENERGY_NOW,
335 POWER_SUPPLY_PROP_CAPACITY,
336 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
337 POWER_SUPPLY_PROP_MODEL_NAME,
338 POWER_SUPPLY_PROP_MANUFACTURER,
339 POWER_SUPPLY_PROP_SERIAL_NUMBER,
340 };
341
342 /* --------------------------------------------------------------------------
343 Battery Management
344 -------------------------------------------------------------------------- */
345 struct acpi_offsets {
346 size_t offset; /* offset inside struct acpi_sbs_battery */
347 u8 mode; /* int or string? */
348 };
349
350 static const struct acpi_offsets state_offsets[] = {
351 {offsetof(struct acpi_battery, state), 0},
352 {offsetof(struct acpi_battery, rate_now), 0},
353 {offsetof(struct acpi_battery, capacity_now), 0},
354 {offsetof(struct acpi_battery, voltage_now), 0},
355 };
356
357 static const struct acpi_offsets info_offsets[] = {
358 {offsetof(struct acpi_battery, power_unit), 0},
359 {offsetof(struct acpi_battery, design_capacity), 0},
360 {offsetof(struct acpi_battery, full_charge_capacity), 0},
361 {offsetof(struct acpi_battery, technology), 0},
362 {offsetof(struct acpi_battery, design_voltage), 0},
363 {offsetof(struct acpi_battery, design_capacity_warning), 0},
364 {offsetof(struct acpi_battery, design_capacity_low), 0},
365 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
366 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
367 {offsetof(struct acpi_battery, model_number), 1},
368 {offsetof(struct acpi_battery, serial_number), 1},
369 {offsetof(struct acpi_battery, type), 1},
370 {offsetof(struct acpi_battery, oem_info), 1},
371 };
372
373 static const struct acpi_offsets extended_info_offsets[] = {
374 {offsetof(struct acpi_battery, revision), 0},
375 {offsetof(struct acpi_battery, power_unit), 0},
376 {offsetof(struct acpi_battery, design_capacity), 0},
377 {offsetof(struct acpi_battery, full_charge_capacity), 0},
378 {offsetof(struct acpi_battery, technology), 0},
379 {offsetof(struct acpi_battery, design_voltage), 0},
380 {offsetof(struct acpi_battery, design_capacity_warning), 0},
381 {offsetof(struct acpi_battery, design_capacity_low), 0},
382 {offsetof(struct acpi_battery, cycle_count), 0},
383 {offsetof(struct acpi_battery, measurement_accuracy), 0},
384 {offsetof(struct acpi_battery, max_sampling_time), 0},
385 {offsetof(struct acpi_battery, min_sampling_time), 0},
386 {offsetof(struct acpi_battery, max_averaging_interval), 0},
387 {offsetof(struct acpi_battery, min_averaging_interval), 0},
388 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
389 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
390 {offsetof(struct acpi_battery, model_number), 1},
391 {offsetof(struct acpi_battery, serial_number), 1},
392 {offsetof(struct acpi_battery, type), 1},
393 {offsetof(struct acpi_battery, oem_info), 1},
394 };
395
396 static int extract_package(struct acpi_battery *battery,
397 union acpi_object *package,
398 const struct acpi_offsets *offsets, int num)
399 {
400 int i;
401 union acpi_object *element;
402 if (package->type != ACPI_TYPE_PACKAGE)
403 return -EFAULT;
404 for (i = 0; i < num; ++i) {
405 if (package->package.count <= i)
406 return -EFAULT;
407 element = &package->package.elements[i];
408 if (offsets[i].mode) {
409 u8 *ptr = (u8 *)battery + offsets[i].offset;
410 if (element->type == ACPI_TYPE_STRING ||
411 element->type == ACPI_TYPE_BUFFER)
412 strncpy(ptr, element->string.pointer, 32);
413 else if (element->type == ACPI_TYPE_INTEGER) {
414 strncpy(ptr, (u8 *)&element->integer.value,
415 sizeof(u64));
416 ptr[sizeof(u64)] = 0;
417 } else
418 *ptr = 0; /* don't have value */
419 } else {
420 int *x = (int *)((u8 *)battery + offsets[i].offset);
421 *x = (element->type == ACPI_TYPE_INTEGER) ?
422 element->integer.value : -1;
423 }
424 }
425 return 0;
426 }
427
428 static int acpi_battery_get_status(struct acpi_battery *battery)
429 {
430 if (acpi_bus_get_status(battery->device)) {
431 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
432 return -ENODEV;
433 }
434 return 0;
435 }
436
437 static int acpi_battery_get_info(struct acpi_battery *battery)
438 {
439 int result = -EFAULT;
440 acpi_status status = 0;
441 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags) ?
442 "_BIX" : "_BIF";
443
444 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
445
446 if (!acpi_battery_present(battery))
447 return 0;
448 mutex_lock(&battery->lock);
449 status = acpi_evaluate_object(battery->device->handle, name,
450 NULL, &buffer);
451 mutex_unlock(&battery->lock);
452
453 if (ACPI_FAILURE(status)) {
454 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
455 return -ENODEV;
456 }
457
458 if (battery_bix_broken_package)
459 result = extract_package(battery, buffer.pointer,
460 extended_info_offsets + 1,
461 ARRAY_SIZE(extended_info_offsets) - 1);
462 else if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
463 result = extract_package(battery, buffer.pointer,
464 extended_info_offsets,
465 ARRAY_SIZE(extended_info_offsets));
466 else
467 result = extract_package(battery, buffer.pointer,
468 info_offsets, ARRAY_SIZE(info_offsets));
469 kfree(buffer.pointer);
470 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
471 battery->full_charge_capacity = battery->design_capacity;
472 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
473 battery->power_unit && battery->design_voltage) {
474 battery->design_capacity = battery->design_capacity *
475 10000 / battery->design_voltage;
476 battery->full_charge_capacity = battery->full_charge_capacity *
477 10000 / battery->design_voltage;
478 battery->design_capacity_warning =
479 battery->design_capacity_warning *
480 10000 / battery->design_voltage;
481 /* Curiously, design_capacity_low, unlike the rest of them,
482 is correct. */
483 /* capacity_granularity_* equal 1 on the systems tested, so
484 it's impossible to tell if they would need an adjustment
485 or not if their values were higher. */
486 }
487 return result;
488 }
489
490 static int acpi_battery_get_state(struct acpi_battery *battery)
491 {
492 int result = 0;
493 acpi_status status = 0;
494 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
495
496 if (!acpi_battery_present(battery))
497 return 0;
498
499 if (battery->update_time &&
500 time_before(jiffies, battery->update_time +
501 msecs_to_jiffies(cache_time)))
502 return 0;
503
504 mutex_lock(&battery->lock);
505 status = acpi_evaluate_object(battery->device->handle, "_BST",
506 NULL, &buffer);
507 mutex_unlock(&battery->lock);
508
509 if (ACPI_FAILURE(status)) {
510 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
511 return -ENODEV;
512 }
513
514 result = extract_package(battery, buffer.pointer,
515 state_offsets, ARRAY_SIZE(state_offsets));
516 battery->update_time = jiffies;
517 kfree(buffer.pointer);
518
519 /* For buggy DSDTs that report negative 16-bit values for either
520 * charging or discharging current and/or report 0 as 65536
521 * due to bad math.
522 */
523 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
524 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
525 (s16)(battery->rate_now) < 0) {
526 battery->rate_now = abs((s16)battery->rate_now);
527 printk_once(KERN_WARNING FW_BUG
528 "battery: (dis)charge rate invalid.\n");
529 }
530
531 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
532 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
533 battery->capacity_now = (battery->capacity_now *
534 battery->full_charge_capacity) / 100;
535 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
536 battery->power_unit && battery->design_voltage) {
537 battery->capacity_now = battery->capacity_now *
538 10000 / battery->design_voltage;
539 }
540 return result;
541 }
542
543 static int acpi_battery_set_alarm(struct acpi_battery *battery)
544 {
545 acpi_status status = 0;
546
547 if (!acpi_battery_present(battery) ||
548 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
549 return -ENODEV;
550
551 mutex_lock(&battery->lock);
552 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
553 battery->alarm);
554 mutex_unlock(&battery->lock);
555
556 if (ACPI_FAILURE(status))
557 return -ENODEV;
558
559 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
560 return 0;
561 }
562
563 static int acpi_battery_init_alarm(struct acpi_battery *battery)
564 {
565 /* See if alarms are supported, and if so, set default */
566 if (!acpi_has_method(battery->device->handle, "_BTP")) {
567 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
568 return 0;
569 }
570 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
571 if (!battery->alarm)
572 battery->alarm = battery->design_capacity_warning;
573 return acpi_battery_set_alarm(battery);
574 }
575
576 static ssize_t acpi_battery_alarm_show(struct device *dev,
577 struct device_attribute *attr,
578 char *buf)
579 {
580 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
581 return sprintf(buf, "%d\n", battery->alarm * 1000);
582 }
583
584 static ssize_t acpi_battery_alarm_store(struct device *dev,
585 struct device_attribute *attr,
586 const char *buf, size_t count)
587 {
588 unsigned long x;
589 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
590 if (sscanf(buf, "%lu\n", &x) == 1)
591 battery->alarm = x/1000;
592 if (acpi_battery_present(battery))
593 acpi_battery_set_alarm(battery);
594 return count;
595 }
596
597 static struct device_attribute alarm_attr = {
598 .attr = {.name = "alarm", .mode = 0644},
599 .show = acpi_battery_alarm_show,
600 .store = acpi_battery_alarm_store,
601 };
602
603 static int sysfs_add_battery(struct acpi_battery *battery)
604 {
605 struct power_supply_config psy_cfg = { .drv_data = battery, };
606
607 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
608 battery->bat_desc.properties = charge_battery_props;
609 battery->bat_desc.num_properties =
610 ARRAY_SIZE(charge_battery_props);
611 } else {
612 battery->bat_desc.properties = energy_battery_props;
613 battery->bat_desc.num_properties =
614 ARRAY_SIZE(energy_battery_props);
615 }
616
617 battery->bat_desc.name = acpi_device_bid(battery->device);
618 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
619 battery->bat_desc.get_property = acpi_battery_get_property;
620
621 battery->bat = power_supply_register_no_ws(&battery->device->dev,
622 &battery->bat_desc, &psy_cfg);
623
624 if (IS_ERR(battery->bat)) {
625 int result = PTR_ERR(battery->bat);
626
627 battery->bat = NULL;
628 return result;
629 }
630 return device_create_file(&battery->bat->dev, &alarm_attr);
631 }
632
633 static void sysfs_remove_battery(struct acpi_battery *battery)
634 {
635 mutex_lock(&battery->sysfs_lock);
636 if (!battery->bat) {
637 mutex_unlock(&battery->sysfs_lock);
638 return;
639 }
640
641 device_remove_file(&battery->bat->dev, &alarm_attr);
642 power_supply_unregister(battery->bat);
643 battery->bat = NULL;
644 mutex_unlock(&battery->sysfs_lock);
645 }
646
647 static void find_battery(const struct dmi_header *dm, void *private)
648 {
649 struct acpi_battery *battery = (struct acpi_battery *)private;
650 /* Note: the hardcoded offsets below have been extracted from
651 the source code of dmidecode. */
652 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
653 const u8 *dmi_data = (const u8 *)(dm + 1);
654 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
655 if (dm->length >= 18)
656 dmi_capacity *= dmi_data[17];
657 if (battery->design_capacity * battery->design_voltage / 1000
658 != dmi_capacity &&
659 battery->design_capacity * 10 == dmi_capacity)
660 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
661 &battery->flags);
662 }
663 }
664
665 /*
666 * According to the ACPI spec, some kinds of primary batteries can
667 * report percentage battery remaining capacity directly to OS.
668 * In this case, it reports the Last Full Charged Capacity == 100
669 * and BatteryPresentRate == 0xFFFFFFFF.
670 *
671 * Now we found some battery reports percentage remaining capacity
672 * even if it's rechargeable.
673 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
674 *
675 * Handle this correctly so that they won't break userspace.
676 */
677 static void acpi_battery_quirks(struct acpi_battery *battery)
678 {
679 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
680 return;
681
682 if (battery->full_charge_capacity == 100 &&
683 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
684 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
685 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
686 battery->full_charge_capacity = battery->design_capacity;
687 battery->capacity_now = (battery->capacity_now *
688 battery->full_charge_capacity) / 100;
689 }
690
691 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
692 return;
693
694 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
695 const char *s;
696 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
697 if (s && !strncasecmp(s, "ThinkPad", 8)) {
698 dmi_walk(find_battery, battery);
699 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
700 &battery->flags) &&
701 battery->design_voltage) {
702 battery->design_capacity =
703 battery->design_capacity *
704 10000 / battery->design_voltage;
705 battery->full_charge_capacity =
706 battery->full_charge_capacity *
707 10000 / battery->design_voltage;
708 battery->design_capacity_warning =
709 battery->design_capacity_warning *
710 10000 / battery->design_voltage;
711 battery->capacity_now = battery->capacity_now *
712 10000 / battery->design_voltage;
713 }
714 }
715 }
716 }
717
718 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
719 {
720 int result, old_present = acpi_battery_present(battery);
721 result = acpi_battery_get_status(battery);
722 if (result)
723 return result;
724 if (!acpi_battery_present(battery)) {
725 sysfs_remove_battery(battery);
726 battery->update_time = 0;
727 return 0;
728 }
729
730 if (resume)
731 return 0;
732
733 if (!battery->update_time ||
734 old_present != acpi_battery_present(battery)) {
735 result = acpi_battery_get_info(battery);
736 if (result)
737 return result;
738 acpi_battery_init_alarm(battery);
739 }
740 if (!battery->bat) {
741 result = sysfs_add_battery(battery);
742 if (result)
743 return result;
744 }
745 result = acpi_battery_get_state(battery);
746 if (result)
747 return result;
748 acpi_battery_quirks(battery);
749
750 /*
751 * Wakeup the system if battery is critical low
752 * or lower than the alarm level
753 */
754 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
755 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
756 (battery->capacity_now <= battery->alarm)))
757 pm_wakeup_event(&battery->device->dev, 0);
758
759 return result;
760 }
761
762 static void acpi_battery_refresh(struct acpi_battery *battery)
763 {
764 int power_unit;
765
766 if (!battery->bat)
767 return;
768
769 power_unit = battery->power_unit;
770
771 acpi_battery_get_info(battery);
772
773 if (power_unit == battery->power_unit)
774 return;
775
776 /* The battery has changed its reporting units. */
777 sysfs_remove_battery(battery);
778 sysfs_add_battery(battery);
779 }
780
781 /* --------------------------------------------------------------------------
782 FS Interface (/proc)
783 -------------------------------------------------------------------------- */
784
785 #ifdef CONFIG_ACPI_PROCFS_POWER
786 static struct proc_dir_entry *acpi_battery_dir;
787
788 static const char *acpi_battery_units(const struct acpi_battery *battery)
789 {
790 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
791 "mA" : "mW";
792 }
793
794 static int acpi_battery_print_info(struct seq_file *seq, int result)
795 {
796 struct acpi_battery *battery = seq->private;
797
798 if (result)
799 goto end;
800
801 seq_printf(seq, "present: %s\n",
802 acpi_battery_present(battery) ? "yes" : "no");
803 if (!acpi_battery_present(battery))
804 goto end;
805 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
806 seq_printf(seq, "design capacity: unknown\n");
807 else
808 seq_printf(seq, "design capacity: %d %sh\n",
809 battery->design_capacity,
810 acpi_battery_units(battery));
811
812 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
813 seq_printf(seq, "last full capacity: unknown\n");
814 else
815 seq_printf(seq, "last full capacity: %d %sh\n",
816 battery->full_charge_capacity,
817 acpi_battery_units(battery));
818
819 seq_printf(seq, "battery technology: %srechargeable\n",
820 (!battery->technology)?"non-":"");
821
822 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
823 seq_printf(seq, "design voltage: unknown\n");
824 else
825 seq_printf(seq, "design voltage: %d mV\n",
826 battery->design_voltage);
827 seq_printf(seq, "design capacity warning: %d %sh\n",
828 battery->design_capacity_warning,
829 acpi_battery_units(battery));
830 seq_printf(seq, "design capacity low: %d %sh\n",
831 battery->design_capacity_low,
832 acpi_battery_units(battery));
833 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
834 seq_printf(seq, "capacity granularity 1: %d %sh\n",
835 battery->capacity_granularity_1,
836 acpi_battery_units(battery));
837 seq_printf(seq, "capacity granularity 2: %d %sh\n",
838 battery->capacity_granularity_2,
839 acpi_battery_units(battery));
840 seq_printf(seq, "model number: %s\n", battery->model_number);
841 seq_printf(seq, "serial number: %s\n", battery->serial_number);
842 seq_printf(seq, "battery type: %s\n", battery->type);
843 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
844 end:
845 if (result)
846 seq_printf(seq, "ERROR: Unable to read battery info\n");
847 return result;
848 }
849
850 static int acpi_battery_print_state(struct seq_file *seq, int result)
851 {
852 struct acpi_battery *battery = seq->private;
853
854 if (result)
855 goto end;
856
857 seq_printf(seq, "present: %s\n",
858 acpi_battery_present(battery) ? "yes" : "no");
859 if (!acpi_battery_present(battery))
860 goto end;
861
862 seq_printf(seq, "capacity state: %s\n",
863 (battery->state & 0x04) ? "critical" : "ok");
864 if ((battery->state & 0x01) && (battery->state & 0x02))
865 seq_printf(seq,
866 "charging state: charging/discharging\n");
867 else if (battery->state & 0x01)
868 seq_printf(seq, "charging state: discharging\n");
869 else if (battery->state & 0x02)
870 seq_printf(seq, "charging state: charging\n");
871 else
872 seq_printf(seq, "charging state: charged\n");
873
874 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
875 seq_printf(seq, "present rate: unknown\n");
876 else
877 seq_printf(seq, "present rate: %d %s\n",
878 battery->rate_now, acpi_battery_units(battery));
879
880 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
881 seq_printf(seq, "remaining capacity: unknown\n");
882 else
883 seq_printf(seq, "remaining capacity: %d %sh\n",
884 battery->capacity_now, acpi_battery_units(battery));
885 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
886 seq_printf(seq, "present voltage: unknown\n");
887 else
888 seq_printf(seq, "present voltage: %d mV\n",
889 battery->voltage_now);
890 end:
891 if (result)
892 seq_printf(seq, "ERROR: Unable to read battery state\n");
893
894 return result;
895 }
896
897 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
898 {
899 struct acpi_battery *battery = seq->private;
900
901 if (result)
902 goto end;
903
904 if (!acpi_battery_present(battery)) {
905 seq_printf(seq, "present: no\n");
906 goto end;
907 }
908 seq_printf(seq, "alarm: ");
909 if (!battery->alarm)
910 seq_printf(seq, "unsupported\n");
911 else
912 seq_printf(seq, "%u %sh\n", battery->alarm,
913 acpi_battery_units(battery));
914 end:
915 if (result)
916 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
917 return result;
918 }
919
920 static ssize_t acpi_battery_write_alarm(struct file *file,
921 const char __user * buffer,
922 size_t count, loff_t * ppos)
923 {
924 int result = 0;
925 char alarm_string[12] = { '\0' };
926 struct seq_file *m = file->private_data;
927 struct acpi_battery *battery = m->private;
928
929 if (!battery || (count > sizeof(alarm_string) - 1))
930 return -EINVAL;
931 if (!acpi_battery_present(battery)) {
932 result = -ENODEV;
933 goto end;
934 }
935 if (copy_from_user(alarm_string, buffer, count)) {
936 result = -EFAULT;
937 goto end;
938 }
939 alarm_string[count] = '\0';
940 if (kstrtoint(alarm_string, 0, &battery->alarm)) {
941 result = -EINVAL;
942 goto end;
943 }
944 result = acpi_battery_set_alarm(battery);
945 end:
946 if (!result)
947 return count;
948 return result;
949 }
950
951 typedef int(*print_func)(struct seq_file *seq, int result);
952
953 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
954 acpi_battery_print_info,
955 acpi_battery_print_state,
956 acpi_battery_print_alarm,
957 };
958
959 static int acpi_battery_read(int fid, struct seq_file *seq)
960 {
961 struct acpi_battery *battery = seq->private;
962 int result = acpi_battery_update(battery, false);
963 return acpi_print_funcs[fid](seq, result);
964 }
965
966 #define DECLARE_FILE_FUNCTIONS(_name) \
967 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
968 { \
969 return acpi_battery_read(_name##_tag, seq); \
970 } \
971 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
972 { \
973 return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
974 }
975
976 DECLARE_FILE_FUNCTIONS(info);
977 DECLARE_FILE_FUNCTIONS(state);
978 DECLARE_FILE_FUNCTIONS(alarm);
979
980 #undef DECLARE_FILE_FUNCTIONS
981
982 #define FILE_DESCRIPTION_RO(_name) \
983 { \
984 .name = __stringify(_name), \
985 .mode = S_IRUGO, \
986 .ops = { \
987 .open = acpi_battery_##_name##_open_fs, \
988 .read = seq_read, \
989 .llseek = seq_lseek, \
990 .release = single_release, \
991 .owner = THIS_MODULE, \
992 }, \
993 }
994
995 #define FILE_DESCRIPTION_RW(_name) \
996 { \
997 .name = __stringify(_name), \
998 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
999 .ops = { \
1000 .open = acpi_battery_##_name##_open_fs, \
1001 .read = seq_read, \
1002 .llseek = seq_lseek, \
1003 .write = acpi_battery_write_##_name, \
1004 .release = single_release, \
1005 .owner = THIS_MODULE, \
1006 }, \
1007 }
1008
1009 static const struct battery_file {
1010 struct file_operations ops;
1011 umode_t mode;
1012 const char *name;
1013 } acpi_battery_file[] = {
1014 FILE_DESCRIPTION_RO(info),
1015 FILE_DESCRIPTION_RO(state),
1016 FILE_DESCRIPTION_RW(alarm),
1017 };
1018
1019 #undef FILE_DESCRIPTION_RO
1020 #undef FILE_DESCRIPTION_RW
1021
1022 static int acpi_battery_add_fs(struct acpi_device *device)
1023 {
1024 struct proc_dir_entry *entry = NULL;
1025 int i;
1026
1027 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
1028 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
1029 if (!acpi_device_dir(device)) {
1030 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1031 acpi_battery_dir);
1032 if (!acpi_device_dir(device))
1033 return -ENODEV;
1034 }
1035
1036 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
1037 entry = proc_create_data(acpi_battery_file[i].name,
1038 acpi_battery_file[i].mode,
1039 acpi_device_dir(device),
1040 &acpi_battery_file[i].ops,
1041 acpi_driver_data(device));
1042 if (!entry)
1043 return -ENODEV;
1044 }
1045 return 0;
1046 }
1047
1048 static void acpi_battery_remove_fs(struct acpi_device *device)
1049 {
1050 int i;
1051 if (!acpi_device_dir(device))
1052 return;
1053 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
1054 remove_proc_entry(acpi_battery_file[i].name,
1055 acpi_device_dir(device));
1056
1057 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
1058 acpi_device_dir(device) = NULL;
1059 }
1060
1061 #endif
1062
1063 /* --------------------------------------------------------------------------
1064 Driver Interface
1065 -------------------------------------------------------------------------- */
1066
1067 static void acpi_battery_notify(struct acpi_device *device, u32 event)
1068 {
1069 struct acpi_battery *battery = acpi_driver_data(device);
1070 struct power_supply *old;
1071
1072 if (!battery)
1073 return;
1074 old = battery->bat;
1075 /*
1076 * On Acer Aspire V5-573G notifications are sometimes triggered too
1077 * early. For example, when AC is unplugged and notification is
1078 * triggered, battery state is still reported as "Full", and changes to
1079 * "Discharging" only after short delay, without any notification.
1080 */
1081 if (battery_notification_delay_ms > 0)
1082 msleep(battery_notification_delay_ms);
1083 if (event == ACPI_BATTERY_NOTIFY_INFO)
1084 acpi_battery_refresh(battery);
1085 acpi_battery_update(battery, false);
1086 acpi_bus_generate_netlink_event(device->pnp.device_class,
1087 dev_name(&device->dev), event,
1088 acpi_battery_present(battery));
1089 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1090 /* acpi_battery_update could remove power_supply object */
1091 if (old && battery->bat)
1092 power_supply_changed(battery->bat);
1093 }
1094
1095 static int battery_notify(struct notifier_block *nb,
1096 unsigned long mode, void *_unused)
1097 {
1098 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1099 pm_nb);
1100 int result;
1101
1102 switch (mode) {
1103 case PM_POST_HIBERNATION:
1104 case PM_POST_SUSPEND:
1105 if (!acpi_battery_present(battery))
1106 return 0;
1107
1108 if (!battery->bat) {
1109 result = acpi_battery_get_info(battery);
1110 if (result)
1111 return result;
1112
1113 result = sysfs_add_battery(battery);
1114 if (result)
1115 return result;
1116 } else
1117 acpi_battery_refresh(battery);
1118
1119 acpi_battery_init_alarm(battery);
1120 acpi_battery_get_state(battery);
1121 break;
1122 }
1123
1124 return 0;
1125 }
1126
1127 static int __init
1128 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1129 {
1130 battery_bix_broken_package = 1;
1131 return 0;
1132 }
1133
1134 static int __init
1135 battery_notification_delay_quirk(const struct dmi_system_id *d)
1136 {
1137 battery_notification_delay_ms = 1000;
1138 return 0;
1139 }
1140
1141 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1142 {
1143 .callback = battery_bix_broken_package_quirk,
1144 .ident = "NEC LZ750/LS",
1145 .matches = {
1146 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1147 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1148 },
1149 },
1150 {
1151 .callback = battery_notification_delay_quirk,
1152 .ident = "Acer Aspire V5-573G",
1153 .matches = {
1154 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1155 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1156 },
1157 },
1158 {},
1159 };
1160
1161 /*
1162 * Some machines'(E,G Lenovo Z480) ECs are not stable
1163 * during boot up and this causes battery driver fails to be
1164 * probed due to failure of getting battery information
1165 * from EC sometimes. After several retries, the operation
1166 * may work. So add retry code here and 20ms sleep between
1167 * every retries.
1168 */
1169 static int acpi_battery_update_retry(struct acpi_battery *battery)
1170 {
1171 int retry, ret;
1172
1173 for (retry = 5; retry; retry--) {
1174 ret = acpi_battery_update(battery, false);
1175 if (!ret)
1176 break;
1177
1178 msleep(20);
1179 }
1180 return ret;
1181 }
1182
1183 static int acpi_battery_add(struct acpi_device *device)
1184 {
1185 int result = 0;
1186 struct acpi_battery *battery = NULL;
1187
1188 if (!device)
1189 return -EINVAL;
1190
1191 if (device->dep_unmet)
1192 return -EPROBE_DEFER;
1193
1194 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1195 if (!battery)
1196 return -ENOMEM;
1197 battery->device = device;
1198 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1199 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1200 device->driver_data = battery;
1201 mutex_init(&battery->lock);
1202 mutex_init(&battery->sysfs_lock);
1203 if (acpi_has_method(battery->device->handle, "_BIX"))
1204 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1205
1206 result = acpi_battery_update_retry(battery);
1207 if (result)
1208 goto fail;
1209
1210 #ifdef CONFIG_ACPI_PROCFS_POWER
1211 result = acpi_battery_add_fs(device);
1212 #endif
1213 if (result) {
1214 #ifdef CONFIG_ACPI_PROCFS_POWER
1215 acpi_battery_remove_fs(device);
1216 #endif
1217 goto fail;
1218 }
1219
1220 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1221 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1222 device->status.battery_present ? "present" : "absent");
1223
1224 battery->pm_nb.notifier_call = battery_notify;
1225 register_pm_notifier(&battery->pm_nb);
1226
1227 device_init_wakeup(&device->dev, 1);
1228
1229 return result;
1230
1231 fail:
1232 sysfs_remove_battery(battery);
1233 mutex_destroy(&battery->lock);
1234 mutex_destroy(&battery->sysfs_lock);
1235 kfree(battery);
1236 return result;
1237 }
1238
1239 static int acpi_battery_remove(struct acpi_device *device)
1240 {
1241 struct acpi_battery *battery = NULL;
1242
1243 if (!device || !acpi_driver_data(device))
1244 return -EINVAL;
1245 device_init_wakeup(&device->dev, 0);
1246 battery = acpi_driver_data(device);
1247 unregister_pm_notifier(&battery->pm_nb);
1248 #ifdef CONFIG_ACPI_PROCFS_POWER
1249 acpi_battery_remove_fs(device);
1250 #endif
1251 sysfs_remove_battery(battery);
1252 mutex_destroy(&battery->lock);
1253 mutex_destroy(&battery->sysfs_lock);
1254 kfree(battery);
1255 return 0;
1256 }
1257
1258 #ifdef CONFIG_PM_SLEEP
1259 /* this is needed to learn about changes made in suspended state */
1260 static int acpi_battery_resume(struct device *dev)
1261 {
1262 struct acpi_battery *battery;
1263
1264 if (!dev)
1265 return -EINVAL;
1266
1267 battery = acpi_driver_data(to_acpi_device(dev));
1268 if (!battery)
1269 return -EINVAL;
1270
1271 battery->update_time = 0;
1272 acpi_battery_update(battery, true);
1273 return 0;
1274 }
1275 #else
1276 #define acpi_battery_resume NULL
1277 #endif
1278
1279 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1280
1281 static struct acpi_driver acpi_battery_driver = {
1282 .name = "battery",
1283 .class = ACPI_BATTERY_CLASS,
1284 .ids = battery_device_ids,
1285 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1286 .ops = {
1287 .add = acpi_battery_add,
1288 .remove = acpi_battery_remove,
1289 .notify = acpi_battery_notify,
1290 },
1291 .drv.pm = &acpi_battery_pm,
1292 };
1293
1294 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1295 {
1296 int result;
1297
1298 dmi_check_system(bat_dmi_table);
1299
1300 #ifdef CONFIG_ACPI_PROCFS_POWER
1301 acpi_battery_dir = acpi_lock_battery_dir();
1302 if (!acpi_battery_dir)
1303 return;
1304 #endif
1305 result = acpi_bus_register_driver(&acpi_battery_driver);
1306 #ifdef CONFIG_ACPI_PROCFS_POWER
1307 if (result < 0)
1308 acpi_unlock_battery_dir(acpi_battery_dir);
1309 #endif
1310 }
1311
1312 static int __init acpi_battery_init(void)
1313 {
1314 if (acpi_disabled)
1315 return -ENODEV;
1316
1317 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1318 return 0;
1319 }
1320
1321 static void __exit acpi_battery_exit(void)
1322 {
1323 async_synchronize_cookie(async_cookie);
1324 acpi_bus_unregister_driver(&acpi_battery_driver);
1325 #ifdef CONFIG_ACPI_PROCFS_POWER
1326 acpi_unlock_battery_dir(acpi_battery_dir);
1327 #endif
1328 }
1329
1330 module_init(acpi_battery_init);
1331 module_exit(acpi_battery_exit);
Linux with added FPC-III support