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Merge branch 'r6040-next'
[linux/fpc-iii.git] / drivers / acpi / battery.c
blobab234791a0ba6101eaff16798a0c425dd347a4bd
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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/types.h>
28 #include <linux/jiffies.h>
29 #include <linux/async.h>
30 #include <linux/dmi.h>
31 #include <linux/delay.h>
32 #include <linux/slab.h>
33 #include <linux/suspend.h>
34 #include <asm/unaligned.h>
35
36 #ifdef CONFIG_ACPI_PROCFS_POWER
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <asm/uaccess.h>
40 #endif
41
42 #include <linux/acpi.h>
43 #include <linux/power_supply.h>
44
45 #include "battery.h"
46
47 #define PREFIX "ACPI: "
48
49 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
50
51 #define ACPI_BATTERY_DEVICE_NAME "Battery"
52
53 /* Battery power unit: 0 means mW, 1 means mA */
54 #define ACPI_BATTERY_POWER_UNIT_MA 1
55
56 #define ACPI_BATTERY_STATE_DISCHARGING 0x1
57 #define ACPI_BATTERY_STATE_CHARGING 0x2
58 #define ACPI_BATTERY_STATE_CRITICAL 0x4
59
60 #define _COMPONENT ACPI_BATTERY_COMPONENT
61
62 ACPI_MODULE_NAME("battery");
63
64 MODULE_AUTHOR("Paul Diefenbaugh");
65 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
66 MODULE_DESCRIPTION("ACPI Battery Driver");
67 MODULE_LICENSE("GPL");
68
69 static async_cookie_t async_cookie;
70 static int battery_bix_broken_package;
71 static int battery_notification_delay_ms;
72 static unsigned int cache_time = 1000;
73 module_param(cache_time, uint, 0644);
74 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
75
76 #ifdef CONFIG_ACPI_PROCFS_POWER
77 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
78 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
79
80 enum acpi_battery_files {
81 info_tag = 0,
82 state_tag,
83 alarm_tag,
84 ACPI_BATTERY_NUMFILES,
85 };
86
87 #endif
88
89 static const struct acpi_device_id battery_device_ids[] = {
90 {"PNP0C0A", 0},
91 {"", 0},
92 };
93
94 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
95
96 enum {
97 ACPI_BATTERY_ALARM_PRESENT,
98 ACPI_BATTERY_XINFO_PRESENT,
99 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
100 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
101 switches between mWh and mAh depending on whether the system
102 is running on battery or not. When mAh is the unit, most
103 reported values are incorrect and need to be adjusted by
104 10000/design_voltage. Verified on x201, t410, t410s, and x220.
105 Pre-2010 and 2012 models appear to always report in mWh and
106 are thus unaffected (tested with t42, t61, t500, x200, x300,
107 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
108 the 2011 models that fixes the issue (tested on x220 with a
109 post-1.29 BIOS), but as of Nov. 2012, no such update is
110 available for the 2010 models. */
111 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
112 };
113
114 struct acpi_battery {
115 struct mutex lock;
116 struct mutex sysfs_lock;
117 struct power_supply *bat;
118 struct power_supply_desc bat_desc;
119 struct acpi_device *device;
120 struct notifier_block pm_nb;
121 unsigned long update_time;
122 int revision;
123 int rate_now;
124 int capacity_now;
125 int voltage_now;
126 int design_capacity;
127 int full_charge_capacity;
128 int technology;
129 int design_voltage;
130 int design_capacity_warning;
131 int design_capacity_low;
132 int cycle_count;
133 int measurement_accuracy;
134 int max_sampling_time;
135 int min_sampling_time;
136 int max_averaging_interval;
137 int min_averaging_interval;
138 int capacity_granularity_1;
139 int capacity_granularity_2;
140 int alarm;
141 char model_number[32];
142 char serial_number[32];
143 char type[32];
144 char oem_info[32];
145 int state;
146 int power_unit;
147 unsigned long flags;
148 };
149
150 #define to_acpi_battery(x) power_supply_get_drvdata(x)
151
152 static inline int acpi_battery_present(struct acpi_battery *battery)
153 {
154 return battery->device->status.battery_present;
155 }
156
157 static int acpi_battery_technology(struct acpi_battery *battery)
158 {
159 if (!strcasecmp("NiCd", battery->type))
160 return POWER_SUPPLY_TECHNOLOGY_NiCd;
161 if (!strcasecmp("NiMH", battery->type))
162 return POWER_SUPPLY_TECHNOLOGY_NiMH;
163 if (!strcasecmp("LION", battery->type))
164 return POWER_SUPPLY_TECHNOLOGY_LION;
165 if (!strncasecmp("LI-ION", battery->type, 6))
166 return POWER_SUPPLY_TECHNOLOGY_LION;
167 if (!strcasecmp("LiP", battery->type))
168 return POWER_SUPPLY_TECHNOLOGY_LIPO;
169 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
170 }
171
172 static int acpi_battery_get_state(struct acpi_battery *battery);
173
174 static int acpi_battery_is_charged(struct acpi_battery *battery)
175 {
176 /* charging, discharging or critical low */
177 if (battery->state != 0)
178 return 0;
179
180 /* battery not reporting charge */
181 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
182 battery->capacity_now == 0)
183 return 0;
184
185 /* good batteries update full_charge as the batteries degrade */
186 if (battery->full_charge_capacity == battery->capacity_now)
187 return 1;
188
189 /* fallback to using design values for broken batteries */
190 if (battery->design_capacity == battery->capacity_now)
191 return 1;
192
193 /* we don't do any sort of metric based on percentages */
194 return 0;
195 }
196
197 static int acpi_battery_get_property(struct power_supply *psy,
198 enum power_supply_property psp,
199 union power_supply_propval *val)
200 {
201 int ret = 0;
202 struct acpi_battery *battery = to_acpi_battery(psy);
203
204 if (acpi_battery_present(battery)) {
205 /* run battery update only if it is present */
206 acpi_battery_get_state(battery);
207 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
208 return -ENODEV;
209 switch (psp) {
210 case POWER_SUPPLY_PROP_STATUS:
211 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
212 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
213 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
214 val->intval = POWER_SUPPLY_STATUS_CHARGING;
215 else if (acpi_battery_is_charged(battery))
216 val->intval = POWER_SUPPLY_STATUS_FULL;
217 else
218 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
219 break;
220 case POWER_SUPPLY_PROP_PRESENT:
221 val->intval = acpi_battery_present(battery);
222 break;
223 case POWER_SUPPLY_PROP_TECHNOLOGY:
224 val->intval = acpi_battery_technology(battery);
225 break;
226 case POWER_SUPPLY_PROP_CYCLE_COUNT:
227 val->intval = battery->cycle_count;
228 break;
229 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
230 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
231 ret = -ENODEV;
232 else
233 val->intval = battery->design_voltage * 1000;
234 break;
235 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
236 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
237 ret = -ENODEV;
238 else
239 val->intval = battery->voltage_now * 1000;
240 break;
241 case POWER_SUPPLY_PROP_CURRENT_NOW:
242 case POWER_SUPPLY_PROP_POWER_NOW:
243 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
244 ret = -ENODEV;
245 else
246 val->intval = battery->rate_now * 1000;
247 break;
248 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
249 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
250 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
251 ret = -ENODEV;
252 else
253 val->intval = battery->design_capacity * 1000;
254 break;
255 case POWER_SUPPLY_PROP_CHARGE_FULL:
256 case POWER_SUPPLY_PROP_ENERGY_FULL:
257 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
258 ret = -ENODEV;
259 else
260 val->intval = battery->full_charge_capacity * 1000;
261 break;
262 case POWER_SUPPLY_PROP_CHARGE_NOW:
263 case POWER_SUPPLY_PROP_ENERGY_NOW:
264 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
265 ret = -ENODEV;
266 else
267 val->intval = battery->capacity_now * 1000;
268 break;
269 case POWER_SUPPLY_PROP_CAPACITY:
270 if (battery->capacity_now && battery->full_charge_capacity)
271 val->intval = battery->capacity_now * 100/
272 battery->full_charge_capacity;
273 else
274 val->intval = 0;
275 break;
276 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
277 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
278 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
279 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
280 (battery->capacity_now <= battery->alarm))
281 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
282 else if (acpi_battery_is_charged(battery))
283 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
284 else
285 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
286 break;
287 case POWER_SUPPLY_PROP_MODEL_NAME:
288 val->strval = battery->model_number;
289 break;
290 case POWER_SUPPLY_PROP_MANUFACTURER:
291 val->strval = battery->oem_info;
292 break;
293 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
294 val->strval = battery->serial_number;
295 break;
296 default:
297 ret = -EINVAL;
298 }
299 return ret;
300 }
301
302 static enum power_supply_property charge_battery_props[] = {
303 POWER_SUPPLY_PROP_STATUS,
304 POWER_SUPPLY_PROP_PRESENT,
305 POWER_SUPPLY_PROP_TECHNOLOGY,
306 POWER_SUPPLY_PROP_CYCLE_COUNT,
307 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
308 POWER_SUPPLY_PROP_VOLTAGE_NOW,
309 POWER_SUPPLY_PROP_CURRENT_NOW,
310 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
311 POWER_SUPPLY_PROP_CHARGE_FULL,
312 POWER_SUPPLY_PROP_CHARGE_NOW,
313 POWER_SUPPLY_PROP_CAPACITY,
314 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
315 POWER_SUPPLY_PROP_MODEL_NAME,
316 POWER_SUPPLY_PROP_MANUFACTURER,
317 POWER_SUPPLY_PROP_SERIAL_NUMBER,
318 };
319
320 static enum power_supply_property energy_battery_props[] = {
321 POWER_SUPPLY_PROP_STATUS,
322 POWER_SUPPLY_PROP_PRESENT,
323 POWER_SUPPLY_PROP_TECHNOLOGY,
324 POWER_SUPPLY_PROP_CYCLE_COUNT,
325 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
326 POWER_SUPPLY_PROP_VOLTAGE_NOW,
327 POWER_SUPPLY_PROP_POWER_NOW,
328 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
329 POWER_SUPPLY_PROP_ENERGY_FULL,
330 POWER_SUPPLY_PROP_ENERGY_NOW,
331 POWER_SUPPLY_PROP_CAPACITY,
332 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
333 POWER_SUPPLY_PROP_MODEL_NAME,
334 POWER_SUPPLY_PROP_MANUFACTURER,
335 POWER_SUPPLY_PROP_SERIAL_NUMBER,
336 };
337
338 /* --------------------------------------------------------------------------
339 Battery Management
340 -------------------------------------------------------------------------- */
341 struct acpi_offsets {
342 size_t offset; /* offset inside struct acpi_sbs_battery */
343 u8 mode; /* int or string? */
344 };
345
346 static const struct acpi_offsets state_offsets[] = {
347 {offsetof(struct acpi_battery, state), 0},
348 {offsetof(struct acpi_battery, rate_now), 0},
349 {offsetof(struct acpi_battery, capacity_now), 0},
350 {offsetof(struct acpi_battery, voltage_now), 0},
351 };
352
353 static const struct acpi_offsets info_offsets[] = {
354 {offsetof(struct acpi_battery, power_unit), 0},
355 {offsetof(struct acpi_battery, design_capacity), 0},
356 {offsetof(struct acpi_battery, full_charge_capacity), 0},
357 {offsetof(struct acpi_battery, technology), 0},
358 {offsetof(struct acpi_battery, design_voltage), 0},
359 {offsetof(struct acpi_battery, design_capacity_warning), 0},
360 {offsetof(struct acpi_battery, design_capacity_low), 0},
361 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
362 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
363 {offsetof(struct acpi_battery, model_number), 1},
364 {offsetof(struct acpi_battery, serial_number), 1},
365 {offsetof(struct acpi_battery, type), 1},
366 {offsetof(struct acpi_battery, oem_info), 1},
367 };
368
369 static const struct acpi_offsets extended_info_offsets[] = {
370 {offsetof(struct acpi_battery, revision), 0},
371 {offsetof(struct acpi_battery, power_unit), 0},
372 {offsetof(struct acpi_battery, design_capacity), 0},
373 {offsetof(struct acpi_battery, full_charge_capacity), 0},
374 {offsetof(struct acpi_battery, technology), 0},
375 {offsetof(struct acpi_battery, design_voltage), 0},
376 {offsetof(struct acpi_battery, design_capacity_warning), 0},
377 {offsetof(struct acpi_battery, design_capacity_low), 0},
378 {offsetof(struct acpi_battery, cycle_count), 0},
379 {offsetof(struct acpi_battery, measurement_accuracy), 0},
380 {offsetof(struct acpi_battery, max_sampling_time), 0},
381 {offsetof(struct acpi_battery, min_sampling_time), 0},
382 {offsetof(struct acpi_battery, max_averaging_interval), 0},
383 {offsetof(struct acpi_battery, min_averaging_interval), 0},
384 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
385 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
386 {offsetof(struct acpi_battery, model_number), 1},
387 {offsetof(struct acpi_battery, serial_number), 1},
388 {offsetof(struct acpi_battery, type), 1},
389 {offsetof(struct acpi_battery, oem_info), 1},
390 };
391
392 static int extract_package(struct acpi_battery *battery,
393 union acpi_object *package,
394 const struct acpi_offsets *offsets, int num)
395 {
396 int i;
397 union acpi_object *element;
398 if (package->type != ACPI_TYPE_PACKAGE)
399 return -EFAULT;
400 for (i = 0; i < num; ++i) {
401 if (package->package.count <= i)
402 return -EFAULT;
403 element = &package->package.elements[i];
404 if (offsets[i].mode) {
405 u8 *ptr = (u8 *)battery + offsets[i].offset;
406 if (element->type == ACPI_TYPE_STRING ||
407 element->type == ACPI_TYPE_BUFFER)
408 strncpy(ptr, element->string.pointer, 32);
409 else if (element->type == ACPI_TYPE_INTEGER) {
410 strncpy(ptr, (u8 *)&element->integer.value,
411 sizeof(u64));
412 ptr[sizeof(u64)] = 0;
413 } else
414 *ptr = 0; /* don't have value */
415 } else {
416 int *x = (int *)((u8 *)battery + offsets[i].offset);
417 *x = (element->type == ACPI_TYPE_INTEGER) ?
418 element->integer.value : -1;
419 }
420 }
421 return 0;
422 }
423
424 static int acpi_battery_get_status(struct acpi_battery *battery)
425 {
426 if (acpi_bus_get_status(battery->device)) {
427 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
428 return -ENODEV;
429 }
430 return 0;
431 }
432
433 static int acpi_battery_get_info(struct acpi_battery *battery)
434 {
435 int result = -EFAULT;
436 acpi_status status = 0;
437 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags) ?
438 "_BIX" : "_BIF";
439
440 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
441
442 if (!acpi_battery_present(battery))
443 return 0;
444 mutex_lock(&battery->lock);
445 status = acpi_evaluate_object(battery->device->handle, name,
446 NULL, &buffer);
447 mutex_unlock(&battery->lock);
448
449 if (ACPI_FAILURE(status)) {
450 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
451 return -ENODEV;
452 }
453
454 if (battery_bix_broken_package)
455 result = extract_package(battery, buffer.pointer,
456 extended_info_offsets + 1,
457 ARRAY_SIZE(extended_info_offsets) - 1);
458 else if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
459 result = extract_package(battery, buffer.pointer,
460 extended_info_offsets,
461 ARRAY_SIZE(extended_info_offsets));
462 else
463 result = extract_package(battery, buffer.pointer,
464 info_offsets, ARRAY_SIZE(info_offsets));
465 kfree(buffer.pointer);
466 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
467 battery->full_charge_capacity = battery->design_capacity;
468 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
469 battery->power_unit && battery->design_voltage) {
470 battery->design_capacity = battery->design_capacity *
471 10000 / battery->design_voltage;
472 battery->full_charge_capacity = battery->full_charge_capacity *
473 10000 / battery->design_voltage;
474 battery->design_capacity_warning =
475 battery->design_capacity_warning *
476 10000 / battery->design_voltage;
477 /* Curiously, design_capacity_low, unlike the rest of them,
478 is correct. */
479 /* capacity_granularity_* equal 1 on the systems tested, so
480 it's impossible to tell if they would need an adjustment
481 or not if their values were higher. */
482 }
483 return result;
484 }
485
486 static int acpi_battery_get_state(struct acpi_battery *battery)
487 {
488 int result = 0;
489 acpi_status status = 0;
490 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
491
492 if (!acpi_battery_present(battery))
493 return 0;
494
495 if (battery->update_time &&
496 time_before(jiffies, battery->update_time +
497 msecs_to_jiffies(cache_time)))
498 return 0;
499
500 mutex_lock(&battery->lock);
501 status = acpi_evaluate_object(battery->device->handle, "_BST",
502 NULL, &buffer);
503 mutex_unlock(&battery->lock);
504
505 if (ACPI_FAILURE(status)) {
506 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
507 return -ENODEV;
508 }
509
510 result = extract_package(battery, buffer.pointer,
511 state_offsets, ARRAY_SIZE(state_offsets));
512 battery->update_time = jiffies;
513 kfree(buffer.pointer);
514
515 /* For buggy DSDTs that report negative 16-bit values for either
516 * charging or discharging current and/or report 0 as 65536
517 * due to bad math.
518 */
519 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
520 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
521 (s16)(battery->rate_now) < 0) {
522 battery->rate_now = abs((s16)battery->rate_now);
523 printk_once(KERN_WARNING FW_BUG
524 "battery: (dis)charge rate invalid.\n");
525 }
526
527 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
528 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
529 battery->capacity_now = (battery->capacity_now *
530 battery->full_charge_capacity) / 100;
531 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
532 battery->power_unit && battery->design_voltage) {
533 battery->capacity_now = battery->capacity_now *
534 10000 / battery->design_voltage;
535 }
536 return result;
537 }
538
539 static int acpi_battery_set_alarm(struct acpi_battery *battery)
540 {
541 acpi_status status = 0;
542
543 if (!acpi_battery_present(battery) ||
544 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
545 return -ENODEV;
546
547 mutex_lock(&battery->lock);
548 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
549 battery->alarm);
550 mutex_unlock(&battery->lock);
551
552 if (ACPI_FAILURE(status))
553 return -ENODEV;
554
555 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
556 return 0;
557 }
558
559 static int acpi_battery_init_alarm(struct acpi_battery *battery)
560 {
561 /* See if alarms are supported, and if so, set default */
562 if (!acpi_has_method(battery->device->handle, "_BTP")) {
563 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
564 return 0;
565 }
566 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
567 if (!battery->alarm)
568 battery->alarm = battery->design_capacity_warning;
569 return acpi_battery_set_alarm(battery);
570 }
571
572 static ssize_t acpi_battery_alarm_show(struct device *dev,
573 struct device_attribute *attr,
574 char *buf)
575 {
576 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
577 return sprintf(buf, "%d\n", battery->alarm * 1000);
578 }
579
580 static ssize_t acpi_battery_alarm_store(struct device *dev,
581 struct device_attribute *attr,
582 const char *buf, size_t count)
583 {
584 unsigned long x;
585 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
586 if (sscanf(buf, "%lu\n", &x) == 1)
587 battery->alarm = x/1000;
588 if (acpi_battery_present(battery))
589 acpi_battery_set_alarm(battery);
590 return count;
591 }
592
593 static struct device_attribute alarm_attr = {
594 .attr = {.name = "alarm", .mode = 0644},
595 .show = acpi_battery_alarm_show,
596 .store = acpi_battery_alarm_store,
597 };
598
599 static int sysfs_add_battery(struct acpi_battery *battery)
600 {
601 struct power_supply_config psy_cfg = { .drv_data = battery, };
602
603 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
604 battery->bat_desc.properties = charge_battery_props;
605 battery->bat_desc.num_properties =
606 ARRAY_SIZE(charge_battery_props);
607 } else {
608 battery->bat_desc.properties = energy_battery_props;
609 battery->bat_desc.num_properties =
610 ARRAY_SIZE(energy_battery_props);
611 }
612
613 battery->bat_desc.name = acpi_device_bid(battery->device);
614 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
615 battery->bat_desc.get_property = acpi_battery_get_property;
616
617 battery->bat = power_supply_register_no_ws(&battery->device->dev,
618 &battery->bat_desc, &psy_cfg);
619
620 if (IS_ERR(battery->bat)) {
621 int result = PTR_ERR(battery->bat);
622
623 battery->bat = NULL;
624 return result;
625 }
626 return device_create_file(&battery->bat->dev, &alarm_attr);
627 }
628
629 static void sysfs_remove_battery(struct acpi_battery *battery)
630 {
631 mutex_lock(&battery->sysfs_lock);
632 if (!battery->bat) {
633 mutex_unlock(&battery->sysfs_lock);
634 return;
635 }
636
637 device_remove_file(&battery->bat->dev, &alarm_attr);
638 power_supply_unregister(battery->bat);
639 battery->bat = NULL;
640 mutex_unlock(&battery->sysfs_lock);
641 }
642
643 static void find_battery(const struct dmi_header *dm, void *private)
644 {
645 struct acpi_battery *battery = (struct acpi_battery *)private;
646 /* Note: the hardcoded offsets below have been extracted from
647 the source code of dmidecode. */
648 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
649 const u8 *dmi_data = (const u8 *)(dm + 1);
650 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
651 if (dm->length >= 18)
652 dmi_capacity *= dmi_data[17];
653 if (battery->design_capacity * battery->design_voltage / 1000
654 != dmi_capacity &&
655 battery->design_capacity * 10 == dmi_capacity)
656 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
657 &battery->flags);
658 }
659 }
660
661 /*
662 * According to the ACPI spec, some kinds of primary batteries can
663 * report percentage battery remaining capacity directly to OS.
664 * In this case, it reports the Last Full Charged Capacity == 100
665 * and BatteryPresentRate == 0xFFFFFFFF.
666 *
667 * Now we found some battery reports percentage remaining capacity
668 * even if it's rechargeable.
669 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
670 *
671 * Handle this correctly so that they won't break userspace.
672 */
673 static void acpi_battery_quirks(struct acpi_battery *battery)
674 {
675 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
676 return;
677
678 if (battery->full_charge_capacity == 100 &&
679 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
680 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
681 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
682 battery->full_charge_capacity = battery->design_capacity;
683 battery->capacity_now = (battery->capacity_now *
684 battery->full_charge_capacity) / 100;
685 }
686
687 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
688 return;
689
690 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
691 const char *s;
692 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
693 if (s && !strncasecmp(s, "ThinkPad", 8)) {
694 dmi_walk(find_battery, battery);
695 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
696 &battery->flags) &&
697 battery->design_voltage) {
698 battery->design_capacity =
699 battery->design_capacity *
700 10000 / battery->design_voltage;
701 battery->full_charge_capacity =
702 battery->full_charge_capacity *
703 10000 / battery->design_voltage;
704 battery->design_capacity_warning =
705 battery->design_capacity_warning *
706 10000 / battery->design_voltage;
707 battery->capacity_now = battery->capacity_now *
708 10000 / battery->design_voltage;
709 }
710 }
711 }
712 }
713
714 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
715 {
716 int result, old_present = acpi_battery_present(battery);
717 result = acpi_battery_get_status(battery);
718 if (result)
719 return result;
720 if (!acpi_battery_present(battery)) {
721 sysfs_remove_battery(battery);
722 battery->update_time = 0;
723 return 0;
724 }
725
726 if (resume)
727 return 0;
728
729 if (!battery->update_time ||
730 old_present != acpi_battery_present(battery)) {
731 result = acpi_battery_get_info(battery);
732 if (result)
733 return result;
734 acpi_battery_init_alarm(battery);
735 }
736 if (!battery->bat) {
737 result = sysfs_add_battery(battery);
738 if (result)
739 return result;
740 }
741 result = acpi_battery_get_state(battery);
742 if (result)
743 return result;
744 acpi_battery_quirks(battery);
745
746 /*
747 * Wakeup the system if battery is critical low
748 * or lower than the alarm level
749 */
750 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
751 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
752 (battery->capacity_now <= battery->alarm)))
753 pm_wakeup_event(&battery->device->dev, 0);
754
755 return result;
756 }
757
758 static void acpi_battery_refresh(struct acpi_battery *battery)
759 {
760 int power_unit;
761
762 if (!battery->bat)
763 return;
764
765 power_unit = battery->power_unit;
766
767 acpi_battery_get_info(battery);
768
769 if (power_unit == battery->power_unit)
770 return;
771
772 /* The battery has changed its reporting units. */
773 sysfs_remove_battery(battery);
774 sysfs_add_battery(battery);
775 }
776
777 /* --------------------------------------------------------------------------
778 FS Interface (/proc)
779 -------------------------------------------------------------------------- */
780
781 #ifdef CONFIG_ACPI_PROCFS_POWER
782 static struct proc_dir_entry *acpi_battery_dir;
783
784 static const char *acpi_battery_units(const struct acpi_battery *battery)
785 {
786 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
787 "mA" : "mW";
788 }
789
790 static int acpi_battery_print_info(struct seq_file *seq, int result)
791 {
792 struct acpi_battery *battery = seq->private;
793
794 if (result)
795 goto end;
796
797 seq_printf(seq, "present: %s\n",
798 acpi_battery_present(battery) ? "yes" : "no");
799 if (!acpi_battery_present(battery))
800 goto end;
801 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
802 seq_printf(seq, "design capacity: unknown\n");
803 else
804 seq_printf(seq, "design capacity: %d %sh\n",
805 battery->design_capacity,
806 acpi_battery_units(battery));
807
808 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
809 seq_printf(seq, "last full capacity: unknown\n");
810 else
811 seq_printf(seq, "last full capacity: %d %sh\n",
812 battery->full_charge_capacity,
813 acpi_battery_units(battery));
814
815 seq_printf(seq, "battery technology: %srechargeable\n",
816 (!battery->technology)?"non-":"");
817
818 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
819 seq_printf(seq, "design voltage: unknown\n");
820 else
821 seq_printf(seq, "design voltage: %d mV\n",
822 battery->design_voltage);
823 seq_printf(seq, "design capacity warning: %d %sh\n",
824 battery->design_capacity_warning,
825 acpi_battery_units(battery));
826 seq_printf(seq, "design capacity low: %d %sh\n",
827 battery->design_capacity_low,
828 acpi_battery_units(battery));
829 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
830 seq_printf(seq, "capacity granularity 1: %d %sh\n",
831 battery->capacity_granularity_1,
832 acpi_battery_units(battery));
833 seq_printf(seq, "capacity granularity 2: %d %sh\n",
834 battery->capacity_granularity_2,
835 acpi_battery_units(battery));
836 seq_printf(seq, "model number: %s\n", battery->model_number);
837 seq_printf(seq, "serial number: %s\n", battery->serial_number);
838 seq_printf(seq, "battery type: %s\n", battery->type);
839 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
840 end:
841 if (result)
842 seq_printf(seq, "ERROR: Unable to read battery info\n");
843 return result;
844 }
845
846 static int acpi_battery_print_state(struct seq_file *seq, int result)
847 {
848 struct acpi_battery *battery = seq->private;
849
850 if (result)
851 goto end;
852
853 seq_printf(seq, "present: %s\n",
854 acpi_battery_present(battery) ? "yes" : "no");
855 if (!acpi_battery_present(battery))
856 goto end;
857
858 seq_printf(seq, "capacity state: %s\n",
859 (battery->state & 0x04) ? "critical" : "ok");
860 if ((battery->state & 0x01) && (battery->state & 0x02))
861 seq_printf(seq,
862 "charging state: charging/discharging\n");
863 else if (battery->state & 0x01)
864 seq_printf(seq, "charging state: discharging\n");
865 else if (battery->state & 0x02)
866 seq_printf(seq, "charging state: charging\n");
867 else
868 seq_printf(seq, "charging state: charged\n");
869
870 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
871 seq_printf(seq, "present rate: unknown\n");
872 else
873 seq_printf(seq, "present rate: %d %s\n",
874 battery->rate_now, acpi_battery_units(battery));
875
876 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
877 seq_printf(seq, "remaining capacity: unknown\n");
878 else
879 seq_printf(seq, "remaining capacity: %d %sh\n",
880 battery->capacity_now, acpi_battery_units(battery));
881 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
882 seq_printf(seq, "present voltage: unknown\n");
883 else
884 seq_printf(seq, "present voltage: %d mV\n",
885 battery->voltage_now);
886 end:
887 if (result)
888 seq_printf(seq, "ERROR: Unable to read battery state\n");
889
890 return result;
891 }
892
893 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
894 {
895 struct acpi_battery *battery = seq->private;
896
897 if (result)
898 goto end;
899
900 if (!acpi_battery_present(battery)) {
901 seq_printf(seq, "present: no\n");
902 goto end;
903 }
904 seq_printf(seq, "alarm: ");
905 if (!battery->alarm)
906 seq_printf(seq, "unsupported\n");
907 else
908 seq_printf(seq, "%u %sh\n", battery->alarm,
909 acpi_battery_units(battery));
910 end:
911 if (result)
912 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
913 return result;
914 }
915
916 static ssize_t acpi_battery_write_alarm(struct file *file,
917 const char __user * buffer,
918 size_t count, loff_t * ppos)
919 {
920 int result = 0;
921 char alarm_string[12] = { '\0' };
922 struct seq_file *m = file->private_data;
923 struct acpi_battery *battery = m->private;
924
925 if (!battery || (count > sizeof(alarm_string) - 1))
926 return -EINVAL;
927 if (!acpi_battery_present(battery)) {
928 result = -ENODEV;
929 goto end;
930 }
931 if (copy_from_user(alarm_string, buffer, count)) {
932 result = -EFAULT;
933 goto end;
934 }
935 alarm_string[count] = '\0';
936 if (kstrtoint(alarm_string, 0, &battery->alarm)) {
937 result = -EINVAL;
938 goto end;
939 }
940 result = acpi_battery_set_alarm(battery);
941 end:
942 if (!result)
943 return count;
944 return result;
945 }
946
947 typedef int(*print_func)(struct seq_file *seq, int result);
948
949 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
950 acpi_battery_print_info,
951 acpi_battery_print_state,
952 acpi_battery_print_alarm,
953 };
954
955 static int acpi_battery_read(int fid, struct seq_file *seq)
956 {
957 struct acpi_battery *battery = seq->private;
958 int result = acpi_battery_update(battery, false);
959 return acpi_print_funcs[fid](seq, result);
960 }
961
962 #define DECLARE_FILE_FUNCTIONS(_name) \
963 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
964 { \
965 return acpi_battery_read(_name##_tag, seq); \
966 } \
967 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
968 { \
969 return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
970 }
971
972 DECLARE_FILE_FUNCTIONS(info);
973 DECLARE_FILE_FUNCTIONS(state);
974 DECLARE_FILE_FUNCTIONS(alarm);
975
976 #undef DECLARE_FILE_FUNCTIONS
977
978 #define FILE_DESCRIPTION_RO(_name) \
979 { \
980 .name = __stringify(_name), \
981 .mode = S_IRUGO, \
982 .ops = { \
983 .open = acpi_battery_##_name##_open_fs, \
984 .read = seq_read, \
985 .llseek = seq_lseek, \
986 .release = single_release, \
987 .owner = THIS_MODULE, \
988 }, \
989 }
990
991 #define FILE_DESCRIPTION_RW(_name) \
992 { \
993 .name = __stringify(_name), \
994 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
995 .ops = { \
996 .open = acpi_battery_##_name##_open_fs, \
997 .read = seq_read, \
998 .llseek = seq_lseek, \
999 .write = acpi_battery_write_##_name, \
1000 .release = single_release, \
1001 .owner = THIS_MODULE, \
1002 }, \
1003 }
1004
1005 static const struct battery_file {
1006 struct file_operations ops;
1007 umode_t mode;
1008 const char *name;
1009 } acpi_battery_file[] = {
1010 FILE_DESCRIPTION_RO(info),
1011 FILE_DESCRIPTION_RO(state),
1012 FILE_DESCRIPTION_RW(alarm),
1013 };
1014
1015 #undef FILE_DESCRIPTION_RO
1016 #undef FILE_DESCRIPTION_RW
1017
1018 static int acpi_battery_add_fs(struct acpi_device *device)
1019 {
1020 struct proc_dir_entry *entry = NULL;
1021 int i;
1022
1023 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
1024 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
1025 if (!acpi_device_dir(device)) {
1026 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1027 acpi_battery_dir);
1028 if (!acpi_device_dir(device))
1029 return -ENODEV;
1030 }
1031
1032 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
1033 entry = proc_create_data(acpi_battery_file[i].name,
1034 acpi_battery_file[i].mode,
1035 acpi_device_dir(device),
1036 &acpi_battery_file[i].ops,
1037 acpi_driver_data(device));
1038 if (!entry)
1039 return -ENODEV;
1040 }
1041 return 0;
1042 }
1043
1044 static void acpi_battery_remove_fs(struct acpi_device *device)
1045 {
1046 int i;
1047 if (!acpi_device_dir(device))
1048 return;
1049 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
1050 remove_proc_entry(acpi_battery_file[i].name,
1051 acpi_device_dir(device));
1052
1053 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
1054 acpi_device_dir(device) = NULL;
1055 }
1056
1057 #endif
1058
1059 /* --------------------------------------------------------------------------
1060 Driver Interface
1061 -------------------------------------------------------------------------- */
1062
1063 static void acpi_battery_notify(struct acpi_device *device, u32 event)
1064 {
1065 struct acpi_battery *battery = acpi_driver_data(device);
1066 struct power_supply *old;
1067
1068 if (!battery)
1069 return;
1070 old = battery->bat;
1071 /*
1072 * On Acer Aspire V5-573G notifications are sometimes triggered too
1073 * early. For example, when AC is unplugged and notification is
1074 * triggered, battery state is still reported as "Full", and changes to
1075 * "Discharging" only after short delay, without any notification.
1076 */
1077 if (battery_notification_delay_ms > 0)
1078 msleep(battery_notification_delay_ms);
1079 if (event == ACPI_BATTERY_NOTIFY_INFO)
1080 acpi_battery_refresh(battery);
1081 acpi_battery_update(battery, false);
1082 acpi_bus_generate_netlink_event(device->pnp.device_class,
1083 dev_name(&device->dev), event,
1084 acpi_battery_present(battery));
1085 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1086 /* acpi_battery_update could remove power_supply object */
1087 if (old && battery->bat)
1088 power_supply_changed(battery->bat);
1089 }
1090
1091 static int battery_notify(struct notifier_block *nb,
1092 unsigned long mode, void *_unused)
1093 {
1094 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1095 pm_nb);
1096 int result;
1097
1098 switch (mode) {
1099 case PM_POST_HIBERNATION:
1100 case PM_POST_SUSPEND:
1101 if (!acpi_battery_present(battery))
1102 return 0;
1103
1104 if (!battery->bat) {
1105 result = acpi_battery_get_info(battery);
1106 if (result)
1107 return result;
1108
1109 result = sysfs_add_battery(battery);
1110 if (result)
1111 return result;
1112 } else
1113 acpi_battery_refresh(battery);
1114
1115 acpi_battery_init_alarm(battery);
1116 acpi_battery_get_state(battery);
1117 break;
1118 }
1119
1120 return 0;
1121 }
1122
1123 static int __init
1124 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1125 {
1126 battery_bix_broken_package = 1;
1127 return 0;
1128 }
1129
1130 static int __init
1131 battery_notification_delay_quirk(const struct dmi_system_id *d)
1132 {
1133 battery_notification_delay_ms = 1000;
1134 return 0;
1135 }
1136
1137 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1138 {
1139 .callback = battery_bix_broken_package_quirk,
1140 .ident = "NEC LZ750/LS",
1141 .matches = {
1142 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1143 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1144 },
1145 },
1146 {
1147 .callback = battery_notification_delay_quirk,
1148 .ident = "Acer Aspire V5-573G",
1149 .matches = {
1150 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1151 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1152 },
1153 },
1154 {},
1155 };
1156
1157 /*
1158 * Some machines'(E,G Lenovo Z480) ECs are not stable
1159 * during boot up and this causes battery driver fails to be
1160 * probed due to failure of getting battery information
1161 * from EC sometimes. After several retries, the operation
1162 * may work. So add retry code here and 20ms sleep between
1163 * every retries.
1164 */
1165 static int acpi_battery_update_retry(struct acpi_battery *battery)
1166 {
1167 int retry, ret;
1168
1169 for (retry = 5; retry; retry--) {
1170 ret = acpi_battery_update(battery, false);
1171 if (!ret)
1172 break;
1173
1174 msleep(20);
1175 }
1176 return ret;
1177 }
1178
1179 static int acpi_battery_add(struct acpi_device *device)
1180 {
1181 int result = 0;
1182 struct acpi_battery *battery = NULL;
1183
1184 if (!device)
1185 return -EINVAL;
1186
1187 if (device->dep_unmet)
1188 return -EPROBE_DEFER;
1189
1190 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1191 if (!battery)
1192 return -ENOMEM;
1193 battery->device = device;
1194 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1195 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1196 device->driver_data = battery;
1197 mutex_init(&battery->lock);
1198 mutex_init(&battery->sysfs_lock);
1199 if (acpi_has_method(battery->device->handle, "_BIX"))
1200 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1201
1202 result = acpi_battery_update_retry(battery);
1203 if (result)
1204 goto fail;
1205
1206 #ifdef CONFIG_ACPI_PROCFS_POWER
1207 result = acpi_battery_add_fs(device);
1208 #endif
1209 if (result) {
1210 #ifdef CONFIG_ACPI_PROCFS_POWER
1211 acpi_battery_remove_fs(device);
1212 #endif
1213 goto fail;
1214 }
1215
1216 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1217 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1218 device->status.battery_present ? "present" : "absent");
1219
1220 battery->pm_nb.notifier_call = battery_notify;
1221 register_pm_notifier(&battery->pm_nb);
1222
1223 device_init_wakeup(&device->dev, 1);
1224
1225 return result;
1226
1227 fail:
1228 sysfs_remove_battery(battery);
1229 mutex_destroy(&battery->lock);
1230 mutex_destroy(&battery->sysfs_lock);
1231 kfree(battery);
1232 return result;
1233 }
1234
1235 static int acpi_battery_remove(struct acpi_device *device)
1236 {
1237 struct acpi_battery *battery = NULL;
1238
1239 if (!device || !acpi_driver_data(device))
1240 return -EINVAL;
1241 device_init_wakeup(&device->dev, 0);
1242 battery = acpi_driver_data(device);
1243 unregister_pm_notifier(&battery->pm_nb);
1244 #ifdef CONFIG_ACPI_PROCFS_POWER
1245 acpi_battery_remove_fs(device);
1246 #endif
1247 sysfs_remove_battery(battery);
1248 mutex_destroy(&battery->lock);
1249 mutex_destroy(&battery->sysfs_lock);
1250 kfree(battery);
1251 return 0;
1252 }
1253
1254 #ifdef CONFIG_PM_SLEEP
1255 /* this is needed to learn about changes made in suspended state */
1256 static int acpi_battery_resume(struct device *dev)
1257 {
1258 struct acpi_battery *battery;
1259
1260 if (!dev)
1261 return -EINVAL;
1262
1263 battery = acpi_driver_data(to_acpi_device(dev));
1264 if (!battery)
1265 return -EINVAL;
1266
1267 battery->update_time = 0;
1268 acpi_battery_update(battery, true);
1269 return 0;
1270 }
1271 #else
1272 #define acpi_battery_resume NULL
1273 #endif
1274
1275 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1276
1277 static struct acpi_driver acpi_battery_driver = {
1278 .name = "battery",
1279 .class = ACPI_BATTERY_CLASS,
1280 .ids = battery_device_ids,
1281 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1282 .ops = {
1283 .add = acpi_battery_add,
1284 .remove = acpi_battery_remove,
1285 .notify = acpi_battery_notify,
1286 },
1287 .drv.pm = &acpi_battery_pm,
1288 };
1289
1290 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1291 {
1292 int result;
1293
1294 dmi_check_system(bat_dmi_table);
1295
1296 #ifdef CONFIG_ACPI_PROCFS_POWER
1297 acpi_battery_dir = acpi_lock_battery_dir();
1298 if (!acpi_battery_dir)
1299 return;
1300 #endif
1301 result = acpi_bus_register_driver(&acpi_battery_driver);
1302 #ifdef CONFIG_ACPI_PROCFS_POWER
1303 if (result < 0)
1304 acpi_unlock_battery_dir(acpi_battery_dir);
1305 #endif
1306 }
1307
1308 static int __init acpi_battery_init(void)
1309 {
1310 if (acpi_disabled)
1311 return -ENODEV;
1312
1313 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1314 return 0;
1315 }
1316
1317 static void __exit acpi_battery_exit(void)
1318 {
1319 async_synchronize_cookie(async_cookie + 1);
1320 acpi_bus_unregister_driver(&acpi_battery_driver);
1321 #ifdef CONFIG_ACPI_PROCFS_POWER
1322 acpi_unlock_battery_dir(acpi_battery_dir);
1323 #endif
1324 }
1325
1326 module_init(acpi_battery_init);
1327 module_exit(acpi_battery_exit);
Linux with added FPC-III support