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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * battery.c - ACPI Battery Driver (Revision: 2.0)
4 *
5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11#define pr_fmt(fmt) "ACPI: battery: " fmt
12
13#include <linux/delay.h>
14#include <linux/dmi.h>
15#include <linux/jiffies.h>
16#include <linux/kernel.h>
17#include <linux/list.h>
18#include <linux/module.h>
19#include <linux/mutex.h>
20#include <linux/slab.h>
21#include <linux/suspend.h>
22#include <linux/types.h>
23
24#include <linux/unaligned.h>
25
26#include <linux/acpi.h>
27#include <linux/power_supply.h>
28
29#include <acpi/battery.h>
30
31#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
32#define ACPI_BATTERY_CAPACITY_VALID(capacity) \
33 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
34
35#define ACPI_BATTERY_DEVICE_NAME "Battery"
36
37/* Battery power unit: 0 means mW, 1 means mA */
38#define ACPI_BATTERY_POWER_UNIT_MA 1
39
40#define ACPI_BATTERY_STATE_DISCHARGING 0x1
41#define ACPI_BATTERY_STATE_CHARGING 0x2
42#define ACPI_BATTERY_STATE_CRITICAL 0x4
43#define ACPI_BATTERY_STATE_CHARGE_LIMITING 0x8
44
45#define MAX_STRING_LENGTH 64
46
47MODULE_AUTHOR("Paul Diefenbaugh");
48MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
49MODULE_DESCRIPTION("ACPI Battery Driver");
50MODULE_LICENSE("GPL");
51
52static int battery_bix_broken_package;
53static int battery_notification_delay_ms;
54static int battery_ac_is_broken;
55static unsigned int cache_time = 1000;
56module_param(cache_time, uint, 0644);
57MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
58
59static const struct acpi_device_id battery_device_ids[] = {
60 {"PNP0C0A", 0},
61
62 /* Microsoft Surface Go 3 */
63 {"MSHW0146", 0},
64
65 {"", 0},
66};
67
68MODULE_DEVICE_TABLE(acpi, battery_device_ids);
69
70enum {
71 ACPI_BATTERY_ALARM_PRESENT,
72 ACPI_BATTERY_XINFO_PRESENT,
73 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
74 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
75 * switches between mWh and mAh depending on whether the system
76 * is running on battery or not. When mAh is the unit, most
77 * reported values are incorrect and need to be adjusted by
78 * 10000/design_voltage. Verified on x201, t410, t410s, and x220.
79 * Pre-2010 and 2012 models appear to always report in mWh and
80 * are thus unaffected (tested with t42, t61, t500, x200, x300,
81 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for
82 * the 2011 models that fixes the issue (tested on x220 with a
83 * post-1.29 BIOS), but as of Nov. 2012, no such update is
84 * available for the 2010 models.
85 */
86 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
87 /* for batteries reporting current capacity with design capacity
88 * on a full charge, but showing degradation in full charge cap.
89 */
90 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
91};
92
93struct acpi_battery {
94 struct mutex lock;
95 struct mutex sysfs_lock;
96 struct power_supply *bat;
97 struct power_supply_desc bat_desc;
98 struct acpi_device *device;
99 struct notifier_block pm_nb;
100 struct list_head list;
101 unsigned long update_time;
102 int revision;
103 int rate_now;
104 int capacity_now;
105 int voltage_now;
106 int design_capacity;
107 int full_charge_capacity;
108 int technology;
109 int design_voltage;
110 int design_capacity_warning;
111 int design_capacity_low;
112 int cycle_count;
113 int measurement_accuracy;
114 int max_sampling_time;
115 int min_sampling_time;
116 int max_averaging_interval;
117 int min_averaging_interval;
118 int capacity_granularity_1;
119 int capacity_granularity_2;
120 int alarm;
121 char model_number[MAX_STRING_LENGTH];
122 char serial_number[MAX_STRING_LENGTH];
123 char type[MAX_STRING_LENGTH];
124 char oem_info[MAX_STRING_LENGTH];
125 int state;
126 int power_unit;
127 unsigned long flags;
128};
129
130#define to_acpi_battery(x) power_supply_get_drvdata(x)
131
132static inline int acpi_battery_present(struct acpi_battery *battery)
133{
134 return battery->device->status.battery_present;
135}
136
137static int acpi_battery_technology(struct acpi_battery *battery)
138{
139 if (!strcasecmp("NiCd", battery->type))
140 return POWER_SUPPLY_TECHNOLOGY_NiCd;
141 if (!strcasecmp("NiMH", battery->type))
142 return POWER_SUPPLY_TECHNOLOGY_NiMH;
143 if (!strcasecmp("LION", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_LION;
145 if (!strncasecmp("LI-ION", battery->type, 6))
146 return POWER_SUPPLY_TECHNOLOGY_LION;
147 if (!strcasecmp("LiP", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_LIPO;
149 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
150}
151
152static int acpi_battery_get_state(struct acpi_battery *battery);
153
154static int acpi_battery_is_charged(struct acpi_battery *battery)
155{
156 /* charging, discharging, critical low or charge limited */
157 if (battery->state != 0)
158 return 0;
159
160 /* battery not reporting charge */
161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
162 battery->capacity_now == 0)
163 return 0;
164
165 /* good batteries update full_charge as the batteries degrade */
166 if (battery->full_charge_capacity == battery->capacity_now)
167 return 1;
168
169 /* fallback to using design values for broken batteries */
170 if (battery->design_capacity <= battery->capacity_now)
171 return 1;
172
173 /* we don't do any sort of metric based on percentages */
174 return 0;
175}
176
177static bool acpi_battery_is_degraded(struct acpi_battery *battery)
178{
179 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
180 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
181 battery->full_charge_capacity < battery->design_capacity;
182}
183
184static int acpi_battery_handle_discharging(struct acpi_battery *battery)
185{
186 /*
187 * Some devices wrongly report discharging if the battery's charge level
188 * was above the device's start charging threshold atm the AC adapter
189 * was plugged in and the device thus did not start a new charge cycle.
190 */
191 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
192 battery->rate_now == 0)
193 return POWER_SUPPLY_STATUS_NOT_CHARGING;
194
195 return POWER_SUPPLY_STATUS_DISCHARGING;
196}
197
198static int acpi_battery_get_property(struct power_supply *psy,
199 enum power_supply_property psp,
200 union power_supply_propval *val)
201{
202 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
203 struct acpi_battery *battery = to_acpi_battery(psy);
204
205 if (acpi_battery_present(battery)) {
206 /* run battery update only if it is present */
207 acpi_battery_get_state(battery);
208 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
209 return -ENODEV;
210 switch (psp) {
211 case POWER_SUPPLY_PROP_STATUS:
212 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
213 val->intval = acpi_battery_handle_discharging(battery);
214 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
215 val->intval = POWER_SUPPLY_STATUS_CHARGING;
216 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING)
217 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
218 else if (acpi_battery_is_charged(battery))
219 val->intval = POWER_SUPPLY_STATUS_FULL;
220 else
221 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
222 break;
223 case POWER_SUPPLY_PROP_PRESENT:
224 val->intval = acpi_battery_present(battery);
225 break;
226 case POWER_SUPPLY_PROP_TECHNOLOGY:
227 val->intval = acpi_battery_technology(battery);
228 break;
229 case POWER_SUPPLY_PROP_CYCLE_COUNT:
230 val->intval = battery->cycle_count;
231 break;
232 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
233 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
234 ret = -ENODEV;
235 else
236 val->intval = battery->design_voltage * 1000;
237 break;
238 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
239 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
240 ret = -ENODEV;
241 else
242 val->intval = battery->voltage_now * 1000;
243 break;
244 case POWER_SUPPLY_PROP_CURRENT_NOW:
245 case POWER_SUPPLY_PROP_POWER_NOW:
246 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
247 ret = -ENODEV;
248 else
249 val->intval = battery->rate_now * 1000;
250 break;
251 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
252 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
253 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
254 ret = -ENODEV;
255 else
256 val->intval = battery->design_capacity * 1000;
257 break;
258 case POWER_SUPPLY_PROP_CHARGE_FULL:
259 case POWER_SUPPLY_PROP_ENERGY_FULL:
260 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
261 ret = -ENODEV;
262 else
263 val->intval = battery->full_charge_capacity * 1000;
264 break;
265 case POWER_SUPPLY_PROP_CHARGE_NOW:
266 case POWER_SUPPLY_PROP_ENERGY_NOW:
267 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
268 ret = -ENODEV;
269 else
270 val->intval = battery->capacity_now * 1000;
271 break;
272 case POWER_SUPPLY_PROP_CAPACITY:
273 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
274 full_capacity = battery->full_charge_capacity;
275 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
276 full_capacity = battery->design_capacity;
277
278 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
279 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
280 ret = -ENODEV;
281 else
282 val->intval = battery->capacity_now * 100/
283 full_capacity;
284 break;
285 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
286 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
287 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
288 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
289 (battery->capacity_now <= battery->alarm))
290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
291 else if (acpi_battery_is_charged(battery))
292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
293 else
294 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
295 break;
296 case POWER_SUPPLY_PROP_MODEL_NAME:
297 val->strval = battery->model_number;
298 break;
299 case POWER_SUPPLY_PROP_MANUFACTURER:
300 val->strval = battery->oem_info;
301 break;
302 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
303 val->strval = battery->serial_number;
304 break;
305 default:
306 ret = -EINVAL;
307 }
308 return ret;
309}
310
311static const enum power_supply_property charge_battery_props[] = {
312 POWER_SUPPLY_PROP_STATUS,
313 POWER_SUPPLY_PROP_PRESENT,
314 POWER_SUPPLY_PROP_TECHNOLOGY,
315 POWER_SUPPLY_PROP_CYCLE_COUNT,
316 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
317 POWER_SUPPLY_PROP_VOLTAGE_NOW,
318 POWER_SUPPLY_PROP_CURRENT_NOW,
319 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
320 POWER_SUPPLY_PROP_CHARGE_FULL,
321 POWER_SUPPLY_PROP_CHARGE_NOW,
322 POWER_SUPPLY_PROP_CAPACITY,
323 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
324 POWER_SUPPLY_PROP_MODEL_NAME,
325 POWER_SUPPLY_PROP_MANUFACTURER,
326 POWER_SUPPLY_PROP_SERIAL_NUMBER,
327};
328
329static const enum power_supply_property charge_battery_full_cap_broken_props[] = {
330 POWER_SUPPLY_PROP_STATUS,
331 POWER_SUPPLY_PROP_PRESENT,
332 POWER_SUPPLY_PROP_TECHNOLOGY,
333 POWER_SUPPLY_PROP_CYCLE_COUNT,
334 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
335 POWER_SUPPLY_PROP_VOLTAGE_NOW,
336 POWER_SUPPLY_PROP_CURRENT_NOW,
337 POWER_SUPPLY_PROP_CHARGE_NOW,
338 POWER_SUPPLY_PROP_MODEL_NAME,
339 POWER_SUPPLY_PROP_MANUFACTURER,
340 POWER_SUPPLY_PROP_SERIAL_NUMBER,
341};
342
343static const enum power_supply_property energy_battery_props[] = {
344 POWER_SUPPLY_PROP_STATUS,
345 POWER_SUPPLY_PROP_PRESENT,
346 POWER_SUPPLY_PROP_TECHNOLOGY,
347 POWER_SUPPLY_PROP_CYCLE_COUNT,
348 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
349 POWER_SUPPLY_PROP_VOLTAGE_NOW,
350 POWER_SUPPLY_PROP_POWER_NOW,
351 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
352 POWER_SUPPLY_PROP_ENERGY_FULL,
353 POWER_SUPPLY_PROP_ENERGY_NOW,
354 POWER_SUPPLY_PROP_CAPACITY,
355 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
356 POWER_SUPPLY_PROP_MODEL_NAME,
357 POWER_SUPPLY_PROP_MANUFACTURER,
358 POWER_SUPPLY_PROP_SERIAL_NUMBER,
359};
360
361static const enum power_supply_property energy_battery_full_cap_broken_props[] = {
362 POWER_SUPPLY_PROP_STATUS,
363 POWER_SUPPLY_PROP_PRESENT,
364 POWER_SUPPLY_PROP_TECHNOLOGY,
365 POWER_SUPPLY_PROP_CYCLE_COUNT,
366 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
367 POWER_SUPPLY_PROP_VOLTAGE_NOW,
368 POWER_SUPPLY_PROP_POWER_NOW,
369 POWER_SUPPLY_PROP_ENERGY_NOW,
370 POWER_SUPPLY_PROP_MODEL_NAME,
371 POWER_SUPPLY_PROP_MANUFACTURER,
372 POWER_SUPPLY_PROP_SERIAL_NUMBER,
373};
374
375/* Battery Management */
376struct acpi_offsets {
377 size_t offset; /* offset inside struct acpi_sbs_battery */
378 u8 mode; /* int or string? */
379};
380
381static const struct acpi_offsets state_offsets[] = {
382 {offsetof(struct acpi_battery, state), 0},
383 {offsetof(struct acpi_battery, rate_now), 0},
384 {offsetof(struct acpi_battery, capacity_now), 0},
385 {offsetof(struct acpi_battery, voltage_now), 0},
386};
387
388static const struct acpi_offsets info_offsets[] = {
389 {offsetof(struct acpi_battery, power_unit), 0},
390 {offsetof(struct acpi_battery, design_capacity), 0},
391 {offsetof(struct acpi_battery, full_charge_capacity), 0},
392 {offsetof(struct acpi_battery, technology), 0},
393 {offsetof(struct acpi_battery, design_voltage), 0},
394 {offsetof(struct acpi_battery, design_capacity_warning), 0},
395 {offsetof(struct acpi_battery, design_capacity_low), 0},
396 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
397 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
398 {offsetof(struct acpi_battery, model_number), 1},
399 {offsetof(struct acpi_battery, serial_number), 1},
400 {offsetof(struct acpi_battery, type), 1},
401 {offsetof(struct acpi_battery, oem_info), 1},
402};
403
404static const struct acpi_offsets extended_info_offsets[] = {
405 {offsetof(struct acpi_battery, revision), 0},
406 {offsetof(struct acpi_battery, power_unit), 0},
407 {offsetof(struct acpi_battery, design_capacity), 0},
408 {offsetof(struct acpi_battery, full_charge_capacity), 0},
409 {offsetof(struct acpi_battery, technology), 0},
410 {offsetof(struct acpi_battery, design_voltage), 0},
411 {offsetof(struct acpi_battery, design_capacity_warning), 0},
412 {offsetof(struct acpi_battery, design_capacity_low), 0},
413 {offsetof(struct acpi_battery, cycle_count), 0},
414 {offsetof(struct acpi_battery, measurement_accuracy), 0},
415 {offsetof(struct acpi_battery, max_sampling_time), 0},
416 {offsetof(struct acpi_battery, min_sampling_time), 0},
417 {offsetof(struct acpi_battery, max_averaging_interval), 0},
418 {offsetof(struct acpi_battery, min_averaging_interval), 0},
419 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
420 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
421 {offsetof(struct acpi_battery, model_number), 1},
422 {offsetof(struct acpi_battery, serial_number), 1},
423 {offsetof(struct acpi_battery, type), 1},
424 {offsetof(struct acpi_battery, oem_info), 1},
425};
426
427static int extract_package(struct acpi_battery *battery,
428 union acpi_object *package,
429 const struct acpi_offsets *offsets, int num)
430{
431 int i;
432 union acpi_object *element;
433
434 if (package->type != ACPI_TYPE_PACKAGE)
435 return -EFAULT;
436 for (i = 0; i < num; ++i) {
437 if (package->package.count <= i)
438 return -EFAULT;
439 element = &package->package.elements[i];
440 if (offsets[i].mode) {
441 u8 *ptr = (u8 *)battery + offsets[i].offset;
442 u32 len = MAX_STRING_LENGTH;
443
444 switch (element->type) {
445 case ACPI_TYPE_BUFFER:
446 if (len > element->buffer.length + 1)
447 len = element->buffer.length + 1;
448
449 fallthrough;
450 case ACPI_TYPE_STRING:
451 strscpy(ptr, element->string.pointer, len);
452
453 break;
454 case ACPI_TYPE_INTEGER:
455 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1);
456
457 break;
458 default:
459 *ptr = 0; /* don't have value */
460 }
461 } else {
462 int *x = (int *)((u8 *)battery + offsets[i].offset);
463 *x = (element->type == ACPI_TYPE_INTEGER) ?
464 element->integer.value : -1;
465 }
466 }
467 return 0;
468}
469
470static int acpi_battery_get_status(struct acpi_battery *battery)
471{
472 if (acpi_bus_get_status(battery->device)) {
473 acpi_handle_info(battery->device->handle,
474 "_STA evaluation failed\n");
475 return -ENODEV;
476 }
477 return 0;
478}
479
480
481static int extract_battery_info(const int use_bix,
482 struct acpi_battery *battery,
483 const struct acpi_buffer *buffer)
484{
485 int result = -EFAULT;
486
487 if (use_bix && battery_bix_broken_package)
488 result = extract_package(battery, buffer->pointer,
489 extended_info_offsets + 1,
490 ARRAY_SIZE(extended_info_offsets) - 1);
491 else if (use_bix)
492 result = extract_package(battery, buffer->pointer,
493 extended_info_offsets,
494 ARRAY_SIZE(extended_info_offsets));
495 else
496 result = extract_package(battery, buffer->pointer,
497 info_offsets, ARRAY_SIZE(info_offsets));
498 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
499 battery->full_charge_capacity = battery->design_capacity;
500 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
501 battery->power_unit && battery->design_voltage) {
502 battery->design_capacity = battery->design_capacity *
503 10000 / battery->design_voltage;
504 battery->full_charge_capacity = battery->full_charge_capacity *
505 10000 / battery->design_voltage;
506 battery->design_capacity_warning =
507 battery->design_capacity_warning *
508 10000 / battery->design_voltage;
509 /* Curiously, design_capacity_low, unlike the rest of them,
510 * is correct.
511 */
512 /* capacity_granularity_* equal 1 on the systems tested, so
513 * it's impossible to tell if they would need an adjustment
514 * or not if their values were higher.
515 */
516 }
517 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
518 battery->capacity_now > battery->full_charge_capacity)
519 battery->capacity_now = battery->full_charge_capacity;
520
521 return result;
522}
523
524static int acpi_battery_get_info(struct acpi_battery *battery)
525{
526 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
527 int use_bix;
528 int result = -ENODEV;
529
530 if (!acpi_battery_present(battery))
531 return 0;
532
533
534 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
535 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
536 acpi_status status = AE_ERROR;
537
538 mutex_lock(&battery->lock);
539 status = acpi_evaluate_object(battery->device->handle,
540 use_bix ? "_BIX":"_BIF",
541 NULL, &buffer);
542 mutex_unlock(&battery->lock);
543
544 if (ACPI_FAILURE(status)) {
545 acpi_handle_info(battery->device->handle,
546 "%s evaluation failed: %s\n",
547 use_bix ? "_BIX":"_BIF",
548 acpi_format_exception(status));
549 } else {
550 result = extract_battery_info(use_bix,
551 battery,
552 &buffer);
553
554 kfree(buffer.pointer);
555 break;
556 }
557 }
558
559 if (!result && !use_bix && xinfo)
560 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
561
562 return result;
563}
564
565static int acpi_battery_get_state(struct acpi_battery *battery)
566{
567 int result = 0;
568 acpi_status status = 0;
569 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
570
571 if (!acpi_battery_present(battery))
572 return 0;
573
574 if (battery->update_time &&
575 time_before(jiffies, battery->update_time +
576 msecs_to_jiffies(cache_time)))
577 return 0;
578
579 mutex_lock(&battery->lock);
580 status = acpi_evaluate_object(battery->device->handle, "_BST",
581 NULL, &buffer);
582 mutex_unlock(&battery->lock);
583
584 if (ACPI_FAILURE(status)) {
585 acpi_handle_info(battery->device->handle,
586 "_BST evaluation failed: %s",
587 acpi_format_exception(status));
588 return -ENODEV;
589 }
590
591 result = extract_package(battery, buffer.pointer,
592 state_offsets, ARRAY_SIZE(state_offsets));
593 battery->update_time = jiffies;
594 kfree(buffer.pointer);
595
596 /* For buggy DSDTs that report negative 16-bit values for either
597 * charging or discharging current and/or report 0 as 65536
598 * due to bad math.
599 */
600 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
601 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
602 (s16)(battery->rate_now) < 0) {
603 battery->rate_now = abs((s16)battery->rate_now);
604 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
605 }
606
607 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
608 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
609 battery->capacity_now = (battery->capacity_now *
610 battery->full_charge_capacity) / 100;
611 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
612 battery->power_unit && battery->design_voltage) {
613 battery->capacity_now = battery->capacity_now *
614 10000 / battery->design_voltage;
615 }
616 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
617 battery->capacity_now > battery->full_charge_capacity)
618 battery->capacity_now = battery->full_charge_capacity;
619
620 return result;
621}
622
623static int acpi_battery_set_alarm(struct acpi_battery *battery)
624{
625 acpi_status status = 0;
626
627 if (!acpi_battery_present(battery) ||
628 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
629 return -ENODEV;
630
631 mutex_lock(&battery->lock);
632 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
633 battery->alarm);
634 mutex_unlock(&battery->lock);
635
636 if (ACPI_FAILURE(status))
637 return -ENODEV;
638
639 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
640 battery->alarm);
641
642 return 0;
643}
644
645static int acpi_battery_init_alarm(struct acpi_battery *battery)
646{
647 /* See if alarms are supported, and if so, set default */
648 if (!acpi_has_method(battery->device->handle, "_BTP")) {
649 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
650 return 0;
651 }
652 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
653 if (!battery->alarm)
654 battery->alarm = battery->design_capacity_warning;
655 return acpi_battery_set_alarm(battery);
656}
657
658static ssize_t acpi_battery_alarm_show(struct device *dev,
659 struct device_attribute *attr,
660 char *buf)
661{
662 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
663
664 return sysfs_emit(buf, "%d\n", battery->alarm * 1000);
665}
666
667static ssize_t acpi_battery_alarm_store(struct device *dev,
668 struct device_attribute *attr,
669 const char *buf, size_t count)
670{
671 unsigned long x;
672 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
673
674 if (sscanf(buf, "%lu\n", &x) == 1)
675 battery->alarm = x/1000;
676 if (acpi_battery_present(battery))
677 acpi_battery_set_alarm(battery);
678 return count;
679}
680
681static struct device_attribute alarm_attr = {
682 .attr = {.name = "alarm", .mode = 0644},
683 .show = acpi_battery_alarm_show,
684 .store = acpi_battery_alarm_store,
685};
686
687static struct attribute *acpi_battery_attrs[] = {
688 &alarm_attr.attr,
689 NULL
690};
691ATTRIBUTE_GROUPS(acpi_battery);
692
693/*
694 * The Battery Hooking API
695 *
696 * This API is used inside other drivers that need to expose
697 * platform-specific behaviour within the generic driver in a
698 * generic way.
699 *
700 */
701
702static LIST_HEAD(acpi_battery_list);
703static LIST_HEAD(battery_hook_list);
704static DEFINE_MUTEX(hook_mutex);
705
706static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook)
707{
708 struct acpi_battery *battery;
709
710 /*
711 * In order to remove a hook, we first need to
712 * de-register all the batteries that are registered.
713 */
714 list_for_each_entry(battery, &acpi_battery_list, list) {
715 if (!hook->remove_battery(battery->bat, hook))
716 power_supply_changed(battery->bat);
717 }
718 list_del_init(&hook->list);
719
720 pr_info("extension unregistered: %s\n", hook->name);
721}
722
723void battery_hook_unregister(struct acpi_battery_hook *hook)
724{
725 mutex_lock(&hook_mutex);
726 /*
727 * Ignore already unregistered battery hooks. This might happen
728 * if a battery hook was previously unloaded due to an error when
729 * adding a new battery.
730 */
731 if (!list_empty(&hook->list))
732 battery_hook_unregister_unlocked(hook);
733
734 mutex_unlock(&hook_mutex);
735}
736EXPORT_SYMBOL_GPL(battery_hook_unregister);
737
738void battery_hook_register(struct acpi_battery_hook *hook)
739{
740 struct acpi_battery *battery;
741
742 mutex_lock(&hook_mutex);
743 list_add(&hook->list, &battery_hook_list);
744 /*
745 * Now that the driver is registered, we need
746 * to notify the hook that a battery is available
747 * for each battery, so that the driver may add
748 * its attributes.
749 */
750 list_for_each_entry(battery, &acpi_battery_list, list) {
751 if (hook->add_battery(battery->bat, hook)) {
752 /*
753 * If a add-battery returns non-zero,
754 * the registration of the extension has failed,
755 * and we will not add it to the list of loaded
756 * hooks.
757 */
758 pr_err("extension failed to load: %s", hook->name);
759 battery_hook_unregister_unlocked(hook);
760 goto end;
761 }
762
763 power_supply_changed(battery->bat);
764 }
765 pr_info("new extension: %s\n", hook->name);
766end:
767 mutex_unlock(&hook_mutex);
768}
769EXPORT_SYMBOL_GPL(battery_hook_register);
770
771static void devm_battery_hook_unregister(void *data)
772{
773 struct acpi_battery_hook *hook = data;
774
775 battery_hook_unregister(hook);
776}
777
778int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook)
779{
780 battery_hook_register(hook);
781
782 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook);
783}
784EXPORT_SYMBOL_GPL(devm_battery_hook_register);
785
786/*
787 * This function gets called right after the battery sysfs
788 * attributes have been added, so that the drivers that
789 * define custom sysfs attributes can add their own.
790 */
791static void battery_hook_add_battery(struct acpi_battery *battery)
792{
793 struct acpi_battery_hook *hook_node, *tmp;
794
795 mutex_lock(&hook_mutex);
796 INIT_LIST_HEAD(&battery->list);
797 list_add(&battery->list, &acpi_battery_list);
798 /*
799 * Since we added a new battery to the list, we need to
800 * iterate over the hooks and call add_battery for each
801 * hook that was registered. This usually happens
802 * when a battery gets hotplugged or initialized
803 * during the battery module initialization.
804 */
805 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
806 if (hook_node->add_battery(battery->bat, hook_node)) {
807 /*
808 * The notification of the extensions has failed, to
809 * prevent further errors we will unload the extension.
810 */
811 pr_err("error in extension, unloading: %s",
812 hook_node->name);
813 battery_hook_unregister_unlocked(hook_node);
814 }
815 }
816 mutex_unlock(&hook_mutex);
817}
818
819static void battery_hook_remove_battery(struct acpi_battery *battery)
820{
821 struct acpi_battery_hook *hook;
822
823 mutex_lock(&hook_mutex);
824 /*
825 * Before removing the hook, we need to remove all
826 * custom attributes from the battery.
827 */
828 list_for_each_entry(hook, &battery_hook_list, list) {
829 hook->remove_battery(battery->bat, hook);
830 }
831 /* Then, just remove the battery from the list */
832 list_del(&battery->list);
833 mutex_unlock(&hook_mutex);
834}
835
836static void __exit battery_hook_exit(void)
837{
838 struct acpi_battery_hook *hook;
839 struct acpi_battery_hook *ptr;
840 /*
841 * At this point, the acpi_bus_unregister_driver()
842 * has called remove for all batteries. We just
843 * need to remove the hooks.
844 */
845 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
846 battery_hook_unregister(hook);
847 }
848 mutex_destroy(&hook_mutex);
849}
850
851static int sysfs_add_battery(struct acpi_battery *battery)
852{
853 struct power_supply_config psy_cfg = {
854 .drv_data = battery,
855 .attr_grp = acpi_battery_groups,
856 .no_wakeup_source = true,
857 };
858 bool full_cap_broken = false;
859
860 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
861 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
862 full_cap_broken = true;
863
864 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
865 if (full_cap_broken) {
866 battery->bat_desc.properties =
867 charge_battery_full_cap_broken_props;
868 battery->bat_desc.num_properties =
869 ARRAY_SIZE(charge_battery_full_cap_broken_props);
870 } else {
871 battery->bat_desc.properties = charge_battery_props;
872 battery->bat_desc.num_properties =
873 ARRAY_SIZE(charge_battery_props);
874 }
875 } else {
876 if (full_cap_broken) {
877 battery->bat_desc.properties =
878 energy_battery_full_cap_broken_props;
879 battery->bat_desc.num_properties =
880 ARRAY_SIZE(energy_battery_full_cap_broken_props);
881 } else {
882 battery->bat_desc.properties = energy_battery_props;
883 battery->bat_desc.num_properties =
884 ARRAY_SIZE(energy_battery_props);
885 }
886 }
887
888 battery->bat_desc.name = acpi_device_bid(battery->device);
889 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
890 battery->bat_desc.get_property = acpi_battery_get_property;
891
892 battery->bat = power_supply_register(&battery->device->dev,
893 &battery->bat_desc, &psy_cfg);
894
895 if (IS_ERR(battery->bat)) {
896 int result = PTR_ERR(battery->bat);
897
898 battery->bat = NULL;
899 return result;
900 }
901 battery_hook_add_battery(battery);
902 return 0;
903}
904
905static void sysfs_remove_battery(struct acpi_battery *battery)
906{
907 mutex_lock(&battery->sysfs_lock);
908 if (!battery->bat) {
909 mutex_unlock(&battery->sysfs_lock);
910 return;
911 }
912 battery_hook_remove_battery(battery);
913 power_supply_unregister(battery->bat);
914 battery->bat = NULL;
915 mutex_unlock(&battery->sysfs_lock);
916}
917
918static void find_battery(const struct dmi_header *dm, void *private)
919{
920 struct acpi_battery *battery = (struct acpi_battery *)private;
921 /* Note: the hardcoded offsets below have been extracted from
922 * the source code of dmidecode.
923 */
924 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
925 const u8 *dmi_data = (const u8 *)(dm + 1);
926 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
927
928 if (dm->length >= 18)
929 dmi_capacity *= dmi_data[17];
930 if (battery->design_capacity * battery->design_voltage / 1000
931 != dmi_capacity &&
932 battery->design_capacity * 10 == dmi_capacity)
933 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
934 &battery->flags);
935 }
936}
937
938/*
939 * According to the ACPI spec, some kinds of primary batteries can
940 * report percentage battery remaining capacity directly to OS.
941 * In this case, it reports the Last Full Charged Capacity == 100
942 * and BatteryPresentRate == 0xFFFFFFFF.
943 *
944 * Now we found some battery reports percentage remaining capacity
945 * even if it's rechargeable.
946 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
947 *
948 * Handle this correctly so that they won't break userspace.
949 */
950static void acpi_battery_quirks(struct acpi_battery *battery)
951{
952 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
953 return;
954
955 if (battery->full_charge_capacity == 100 &&
956 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
957 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
958 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
959 battery->full_charge_capacity = battery->design_capacity;
960 battery->capacity_now = (battery->capacity_now *
961 battery->full_charge_capacity) / 100;
962 }
963
964 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
965 return;
966
967 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
968 const char *s;
969
970 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
971 if (s && !strncasecmp(s, "ThinkPad", 8)) {
972 dmi_walk(find_battery, battery);
973 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
974 &battery->flags) &&
975 battery->design_voltage) {
976 battery->design_capacity =
977 battery->design_capacity *
978 10000 / battery->design_voltage;
979 battery->full_charge_capacity =
980 battery->full_charge_capacity *
981 10000 / battery->design_voltage;
982 battery->design_capacity_warning =
983 battery->design_capacity_warning *
984 10000 / battery->design_voltage;
985 battery->capacity_now = battery->capacity_now *
986 10000 / battery->design_voltage;
987 }
988 }
989 }
990
991 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
992 return;
993
994 if (acpi_battery_is_degraded(battery) &&
995 battery->capacity_now > battery->full_charge_capacity) {
996 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
997 battery->capacity_now = battery->full_charge_capacity;
998 }
999}
1000
1001static int acpi_battery_update(struct acpi_battery *battery, bool resume)
1002{
1003 int result = acpi_battery_get_status(battery);
1004
1005 if (result)
1006 return result;
1007
1008 if (!acpi_battery_present(battery)) {
1009 sysfs_remove_battery(battery);
1010 battery->update_time = 0;
1011 return 0;
1012 }
1013
1014 if (resume)
1015 return 0;
1016
1017 if (!battery->update_time) {
1018 result = acpi_battery_get_info(battery);
1019 if (result)
1020 return result;
1021 acpi_battery_init_alarm(battery);
1022 }
1023
1024 result = acpi_battery_get_state(battery);
1025 if (result)
1026 return result;
1027 acpi_battery_quirks(battery);
1028
1029 if (!battery->bat) {
1030 result = sysfs_add_battery(battery);
1031 if (result)
1032 return result;
1033 }
1034
1035 /*
1036 * Wakeup the system if battery is critical low
1037 * or lower than the alarm level
1038 */
1039 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
1040 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1041 (battery->capacity_now <= battery->alarm)))
1042 acpi_pm_wakeup_event(&battery->device->dev);
1043
1044 return result;
1045}
1046
1047static void acpi_battery_refresh(struct acpi_battery *battery)
1048{
1049 int power_unit;
1050
1051 if (!battery->bat)
1052 return;
1053
1054 power_unit = battery->power_unit;
1055
1056 acpi_battery_get_info(battery);
1057
1058 if (power_unit == battery->power_unit)
1059 return;
1060
1061 /* The battery has changed its reporting units. */
1062 sysfs_remove_battery(battery);
1063 sysfs_add_battery(battery);
1064}
1065
1066/* Driver Interface */
1067static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
1068{
1069 struct acpi_device *device = data;
1070 struct acpi_battery *battery = acpi_driver_data(device);
1071 struct power_supply *old;
1072
1073 if (!battery)
1074 return;
1075 old = battery->bat;
1076 /*
1077 * On Acer Aspire V5-573G notifications are sometimes triggered too
1078 * early. For example, when AC is unplugged and notification is
1079 * triggered, battery state is still reported as "Full", and changes to
1080 * "Discharging" only after short delay, without any notification.
1081 */
1082 if (battery_notification_delay_ms > 0)
1083 msleep(battery_notification_delay_ms);
1084 if (event == ACPI_BATTERY_NOTIFY_INFO)
1085 acpi_battery_refresh(battery);
1086 acpi_battery_update(battery, false);
1087 acpi_bus_generate_netlink_event(device->pnp.device_class,
1088 dev_name(&device->dev), event,
1089 acpi_battery_present(battery));
1090 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1091 /* acpi_battery_update could remove power_supply object */
1092 if (old && battery->bat)
1093 power_supply_changed(battery->bat);
1094}
1095
1096static int battery_notify(struct notifier_block *nb,
1097 unsigned long mode, void *_unused)
1098{
1099 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1100 pm_nb);
1101 int result;
1102
1103 switch (mode) {
1104 case PM_POST_HIBERNATION:
1105 case PM_POST_SUSPEND:
1106 if (!acpi_battery_present(battery))
1107 return 0;
1108
1109 if (battery->bat) {
1110 acpi_battery_refresh(battery);
1111 } else {
1112 result = acpi_battery_get_info(battery);
1113 if (result)
1114 return result;
1115
1116 result = sysfs_add_battery(battery);
1117 if (result)
1118 return result;
1119 }
1120
1121 acpi_battery_init_alarm(battery);
1122 acpi_battery_get_state(battery);
1123 break;
1124 }
1125
1126 return 0;
1127}
1128
1129static int __init
1130battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1131{
1132 battery_bix_broken_package = 1;
1133 return 0;
1134}
1135
1136static int __init
1137battery_notification_delay_quirk(const struct dmi_system_id *d)
1138{
1139 battery_notification_delay_ms = 1000;
1140 return 0;
1141}
1142
1143static int __init
1144battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1145{
1146 battery_ac_is_broken = 1;
1147 return 0;
1148}
1149
1150static const struct dmi_system_id bat_dmi_table[] __initconst = {
1151 {
1152 /* NEC LZ750/LS */
1153 .callback = battery_bix_broken_package_quirk,
1154 .matches = {
1155 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1156 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1157 },
1158 },
1159 {
1160 /* Acer Aspire V5-573G */
1161 .callback = battery_notification_delay_quirk,
1162 .matches = {
1163 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1164 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1165 },
1166 },
1167 {
1168 /* Point of View mobii wintab p800w */
1169 .callback = battery_ac_is_broken_quirk,
1170 .matches = {
1171 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1172 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1173 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1174 /* Above matches are too generic, add bios-date match */
1175 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1176 },
1177 },
1178 {
1179 /* Microsoft Surface Go 3 */
1180 .callback = battery_notification_delay_quirk,
1181 .matches = {
1182 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1183 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1184 },
1185 },
1186 {},
1187};
1188
1189/*
1190 * Some machines'(E,G Lenovo Z480) ECs are not stable
1191 * during boot up and this causes battery driver fails to be
1192 * probed due to failure of getting battery information
1193 * from EC sometimes. After several retries, the operation
1194 * may work. So add retry code here and 20ms sleep between
1195 * every retries.
1196 */
1197static int acpi_battery_update_retry(struct acpi_battery *battery)
1198{
1199 int retry, ret;
1200
1201 for (retry = 5; retry; retry--) {
1202 ret = acpi_battery_update(battery, false);
1203 if (!ret)
1204 break;
1205
1206 msleep(20);
1207 }
1208 return ret;
1209}
1210
1211static int acpi_battery_add(struct acpi_device *device)
1212{
1213 int result = 0;
1214 struct acpi_battery *battery;
1215
1216 if (!device)
1217 return -EINVAL;
1218
1219 if (device->dep_unmet)
1220 return -EPROBE_DEFER;
1221
1222 battery = devm_kzalloc(&device->dev, sizeof(*battery), GFP_KERNEL);
1223 if (!battery)
1224 return -ENOMEM;
1225 battery->device = device;
1226 strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1227 strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1228 device->driver_data = battery;
1229 result = devm_mutex_init(&device->dev, &battery->lock);
1230 if (result)
1231 return result;
1232
1233 result = devm_mutex_init(&device->dev, &battery->sysfs_lock);
1234 if (result)
1235 return result;
1236
1237 if (acpi_has_method(battery->device->handle, "_BIX"))
1238 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1239
1240 result = acpi_battery_update_retry(battery);
1241 if (result)
1242 goto fail;
1243
1244 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1245 device->status.battery_present ? "present" : "absent");
1246
1247 battery->pm_nb.notifier_call = battery_notify;
1248 result = register_pm_notifier(&battery->pm_nb);
1249 if (result)
1250 goto fail;
1251
1252 device_init_wakeup(&device->dev, 1);
1253
1254 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
1255 acpi_battery_notify, device);
1256 if (result)
1257 goto fail_pm;
1258
1259 return 0;
1260
1261fail_pm:
1262 device_init_wakeup(&device->dev, 0);
1263 unregister_pm_notifier(&battery->pm_nb);
1264fail:
1265 sysfs_remove_battery(battery);
1266
1267 return result;
1268}
1269
1270static void acpi_battery_remove(struct acpi_device *device)
1271{
1272 struct acpi_battery *battery;
1273
1274 if (!device || !acpi_driver_data(device))
1275 return;
1276
1277 battery = acpi_driver_data(device);
1278
1279 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY,
1280 acpi_battery_notify);
1281
1282 device_init_wakeup(&device->dev, 0);
1283 unregister_pm_notifier(&battery->pm_nb);
1284 sysfs_remove_battery(battery);
1285}
1286
1287/* this is needed to learn about changes made in suspended state */
1288static int acpi_battery_resume(struct device *dev)
1289{
1290 struct acpi_battery *battery;
1291
1292 if (!dev)
1293 return -EINVAL;
1294
1295 battery = acpi_driver_data(to_acpi_device(dev));
1296 if (!battery)
1297 return -EINVAL;
1298
1299 battery->update_time = 0;
1300 acpi_battery_update(battery, true);
1301 return 0;
1302}
1303
1304static DEFINE_SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1305
1306static struct acpi_driver acpi_battery_driver = {
1307 .name = "battery",
1308 .class = ACPI_BATTERY_CLASS,
1309 .ids = battery_device_ids,
1310 .ops = {
1311 .add = acpi_battery_add,
1312 .remove = acpi_battery_remove,
1313 },
1314 .drv.pm = pm_sleep_ptr(&acpi_battery_pm),
1315 .drv.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1316};
1317
1318static int __init acpi_battery_init(void)
1319{
1320 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery())
1321 return -ENODEV;
1322
1323 dmi_check_system(bat_dmi_table);
1324
1325 return acpi_bus_register_driver(&acpi_battery_driver);
1326}
1327
1328static void __exit acpi_battery_exit(void)
1329{
1330 acpi_bus_unregister_driver(&acpi_battery_driver);
1331 battery_hook_exit();
1332}
1333
1334module_init(acpi_battery_init);
1335module_exit(acpi_battery_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * battery.c - ACPI Battery Driver (Revision: 2.0)
4 *
5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11#define pr_fmt(fmt) "ACPI: battery: " fmt
12
13#include <linux/async.h>
14#include <linux/delay.h>
15#include <linux/dmi.h>
16#include <linux/jiffies.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/slab.h>
22#include <linux/suspend.h>
23#include <linux/types.h>
24
25#include <asm/unaligned.h>
26
27#include <linux/acpi.h>
28#include <linux/power_supply.h>
29
30#include <acpi/battery.h>
31
32#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
33#define ACPI_BATTERY_CAPACITY_VALID(capacity) \
34 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
35
36#define ACPI_BATTERY_DEVICE_NAME "Battery"
37
38/* Battery power unit: 0 means mW, 1 means mA */
39#define ACPI_BATTERY_POWER_UNIT_MA 1
40
41#define ACPI_BATTERY_STATE_DISCHARGING 0x1
42#define ACPI_BATTERY_STATE_CHARGING 0x2
43#define ACPI_BATTERY_STATE_CRITICAL 0x4
44
45MODULE_AUTHOR("Paul Diefenbaugh");
46MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
47MODULE_DESCRIPTION("ACPI Battery Driver");
48MODULE_LICENSE("GPL");
49
50static async_cookie_t async_cookie;
51static bool battery_driver_registered;
52static int battery_bix_broken_package;
53static int battery_notification_delay_ms;
54static int battery_ac_is_broken;
55static unsigned int cache_time = 1000;
56module_param(cache_time, uint, 0644);
57MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
58
59static const struct acpi_device_id battery_device_ids[] = {
60 {"PNP0C0A", 0},
61
62 /* Microsoft Surface Go 3 */
63 {"MSHW0146", 0},
64
65 {"", 0},
66};
67
68MODULE_DEVICE_TABLE(acpi, battery_device_ids);
69
70enum {
71 ACPI_BATTERY_ALARM_PRESENT,
72 ACPI_BATTERY_XINFO_PRESENT,
73 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
74 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
75 * switches between mWh and mAh depending on whether the system
76 * is running on battery or not. When mAh is the unit, most
77 * reported values are incorrect and need to be adjusted by
78 * 10000/design_voltage. Verified on x201, t410, t410s, and x220.
79 * Pre-2010 and 2012 models appear to always report in mWh and
80 * are thus unaffected (tested with t42, t61, t500, x200, x300,
81 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for
82 * the 2011 models that fixes the issue (tested on x220 with a
83 * post-1.29 BIOS), but as of Nov. 2012, no such update is
84 * available for the 2010 models.
85 */
86 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
87 /* for batteries reporting current capacity with design capacity
88 * on a full charge, but showing degradation in full charge cap.
89 */
90 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
91};
92
93struct acpi_battery {
94 struct mutex lock;
95 struct mutex sysfs_lock;
96 struct power_supply *bat;
97 struct power_supply_desc bat_desc;
98 struct acpi_device *device;
99 struct notifier_block pm_nb;
100 struct list_head list;
101 unsigned long update_time;
102 int revision;
103 int rate_now;
104 int capacity_now;
105 int voltage_now;
106 int design_capacity;
107 int full_charge_capacity;
108 int technology;
109 int design_voltage;
110 int design_capacity_warning;
111 int design_capacity_low;
112 int cycle_count;
113 int measurement_accuracy;
114 int max_sampling_time;
115 int min_sampling_time;
116 int max_averaging_interval;
117 int min_averaging_interval;
118 int capacity_granularity_1;
119 int capacity_granularity_2;
120 int alarm;
121 char model_number[32];
122 char serial_number[32];
123 char type[32];
124 char oem_info[32];
125 int state;
126 int power_unit;
127 unsigned long flags;
128};
129
130#define to_acpi_battery(x) power_supply_get_drvdata(x)
131
132static inline int acpi_battery_present(struct acpi_battery *battery)
133{
134 return battery->device->status.battery_present;
135}
136
137static int acpi_battery_technology(struct acpi_battery *battery)
138{
139 if (!strcasecmp("NiCd", battery->type))
140 return POWER_SUPPLY_TECHNOLOGY_NiCd;
141 if (!strcasecmp("NiMH", battery->type))
142 return POWER_SUPPLY_TECHNOLOGY_NiMH;
143 if (!strcasecmp("LION", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_LION;
145 if (!strncasecmp("LI-ION", battery->type, 6))
146 return POWER_SUPPLY_TECHNOLOGY_LION;
147 if (!strcasecmp("LiP", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_LIPO;
149 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
150}
151
152static int acpi_battery_get_state(struct acpi_battery *battery);
153
154static int acpi_battery_is_charged(struct acpi_battery *battery)
155{
156 /* charging, discharging or critical low */
157 if (battery->state != 0)
158 return 0;
159
160 /* battery not reporting charge */
161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
162 battery->capacity_now == 0)
163 return 0;
164
165 /* good batteries update full_charge as the batteries degrade */
166 if (battery->full_charge_capacity == battery->capacity_now)
167 return 1;
168
169 /* fallback to using design values for broken batteries */
170 if (battery->design_capacity <= battery->capacity_now)
171 return 1;
172
173 /* we don't do any sort of metric based on percentages */
174 return 0;
175}
176
177static bool acpi_battery_is_degraded(struct acpi_battery *battery)
178{
179 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
180 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
181 battery->full_charge_capacity < battery->design_capacity;
182}
183
184static int acpi_battery_handle_discharging(struct acpi_battery *battery)
185{
186 /*
187 * Some devices wrongly report discharging if the battery's charge level
188 * was above the device's start charging threshold atm the AC adapter
189 * was plugged in and the device thus did not start a new charge cycle.
190 */
191 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
192 battery->rate_now == 0)
193 return POWER_SUPPLY_STATUS_NOT_CHARGING;
194
195 return POWER_SUPPLY_STATUS_DISCHARGING;
196}
197
198static int acpi_battery_get_property(struct power_supply *psy,
199 enum power_supply_property psp,
200 union power_supply_propval *val)
201{
202 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
203 struct acpi_battery *battery = to_acpi_battery(psy);
204
205 if (acpi_battery_present(battery)) {
206 /* run battery update only if it is present */
207 acpi_battery_get_state(battery);
208 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
209 return -ENODEV;
210 switch (psp) {
211 case POWER_SUPPLY_PROP_STATUS:
212 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
213 val->intval = acpi_battery_handle_discharging(battery);
214 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
215 val->intval = POWER_SUPPLY_STATUS_CHARGING;
216 else if (acpi_battery_is_charged(battery))
217 val->intval = POWER_SUPPLY_STATUS_FULL;
218 else
219 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
220 break;
221 case POWER_SUPPLY_PROP_PRESENT:
222 val->intval = acpi_battery_present(battery);
223 break;
224 case POWER_SUPPLY_PROP_TECHNOLOGY:
225 val->intval = acpi_battery_technology(battery);
226 break;
227 case POWER_SUPPLY_PROP_CYCLE_COUNT:
228 val->intval = battery->cycle_count;
229 break;
230 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
231 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
232 ret = -ENODEV;
233 else
234 val->intval = battery->design_voltage * 1000;
235 break;
236 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
237 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
238 ret = -ENODEV;
239 else
240 val->intval = battery->voltage_now * 1000;
241 break;
242 case POWER_SUPPLY_PROP_CURRENT_NOW:
243 case POWER_SUPPLY_PROP_POWER_NOW:
244 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
245 ret = -ENODEV;
246 else
247 val->intval = battery->rate_now * 1000;
248 break;
249 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
250 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
251 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
252 ret = -ENODEV;
253 else
254 val->intval = battery->design_capacity * 1000;
255 break;
256 case POWER_SUPPLY_PROP_CHARGE_FULL:
257 case POWER_SUPPLY_PROP_ENERGY_FULL:
258 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
259 ret = -ENODEV;
260 else
261 val->intval = battery->full_charge_capacity * 1000;
262 break;
263 case POWER_SUPPLY_PROP_CHARGE_NOW:
264 case POWER_SUPPLY_PROP_ENERGY_NOW:
265 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
266 ret = -ENODEV;
267 else
268 val->intval = battery->capacity_now * 1000;
269 break;
270 case POWER_SUPPLY_PROP_CAPACITY:
271 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
272 full_capacity = battery->full_charge_capacity;
273 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
274 full_capacity = battery->design_capacity;
275
276 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
277 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
278 ret = -ENODEV;
279 else
280 val->intval = battery->capacity_now * 100/
281 full_capacity;
282 break;
283 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
284 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
285 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
286 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
287 (battery->capacity_now <= battery->alarm))
288 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
289 else if (acpi_battery_is_charged(battery))
290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
291 else
292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
293 break;
294 case POWER_SUPPLY_PROP_MODEL_NAME:
295 val->strval = battery->model_number;
296 break;
297 case POWER_SUPPLY_PROP_MANUFACTURER:
298 val->strval = battery->oem_info;
299 break;
300 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
301 val->strval = battery->serial_number;
302 break;
303 default:
304 ret = -EINVAL;
305 }
306 return ret;
307}
308
309static enum power_supply_property charge_battery_props[] = {
310 POWER_SUPPLY_PROP_STATUS,
311 POWER_SUPPLY_PROP_PRESENT,
312 POWER_SUPPLY_PROP_TECHNOLOGY,
313 POWER_SUPPLY_PROP_CYCLE_COUNT,
314 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
315 POWER_SUPPLY_PROP_VOLTAGE_NOW,
316 POWER_SUPPLY_PROP_CURRENT_NOW,
317 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
318 POWER_SUPPLY_PROP_CHARGE_FULL,
319 POWER_SUPPLY_PROP_CHARGE_NOW,
320 POWER_SUPPLY_PROP_CAPACITY,
321 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
322 POWER_SUPPLY_PROP_MODEL_NAME,
323 POWER_SUPPLY_PROP_MANUFACTURER,
324 POWER_SUPPLY_PROP_SERIAL_NUMBER,
325};
326
327static enum power_supply_property charge_battery_full_cap_broken_props[] = {
328 POWER_SUPPLY_PROP_STATUS,
329 POWER_SUPPLY_PROP_PRESENT,
330 POWER_SUPPLY_PROP_TECHNOLOGY,
331 POWER_SUPPLY_PROP_CYCLE_COUNT,
332 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
333 POWER_SUPPLY_PROP_VOLTAGE_NOW,
334 POWER_SUPPLY_PROP_CURRENT_NOW,
335 POWER_SUPPLY_PROP_CHARGE_NOW,
336 POWER_SUPPLY_PROP_MODEL_NAME,
337 POWER_SUPPLY_PROP_MANUFACTURER,
338 POWER_SUPPLY_PROP_SERIAL_NUMBER,
339};
340
341static enum power_supply_property energy_battery_props[] = {
342 POWER_SUPPLY_PROP_STATUS,
343 POWER_SUPPLY_PROP_PRESENT,
344 POWER_SUPPLY_PROP_TECHNOLOGY,
345 POWER_SUPPLY_PROP_CYCLE_COUNT,
346 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
347 POWER_SUPPLY_PROP_VOLTAGE_NOW,
348 POWER_SUPPLY_PROP_POWER_NOW,
349 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
350 POWER_SUPPLY_PROP_ENERGY_FULL,
351 POWER_SUPPLY_PROP_ENERGY_NOW,
352 POWER_SUPPLY_PROP_CAPACITY,
353 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
354 POWER_SUPPLY_PROP_MODEL_NAME,
355 POWER_SUPPLY_PROP_MANUFACTURER,
356 POWER_SUPPLY_PROP_SERIAL_NUMBER,
357};
358
359static enum power_supply_property energy_battery_full_cap_broken_props[] = {
360 POWER_SUPPLY_PROP_STATUS,
361 POWER_SUPPLY_PROP_PRESENT,
362 POWER_SUPPLY_PROP_TECHNOLOGY,
363 POWER_SUPPLY_PROP_CYCLE_COUNT,
364 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
365 POWER_SUPPLY_PROP_VOLTAGE_NOW,
366 POWER_SUPPLY_PROP_POWER_NOW,
367 POWER_SUPPLY_PROP_ENERGY_NOW,
368 POWER_SUPPLY_PROP_MODEL_NAME,
369 POWER_SUPPLY_PROP_MANUFACTURER,
370 POWER_SUPPLY_PROP_SERIAL_NUMBER,
371};
372
373/* Battery Management */
374struct acpi_offsets {
375 size_t offset; /* offset inside struct acpi_sbs_battery */
376 u8 mode; /* int or string? */
377};
378
379static const struct acpi_offsets state_offsets[] = {
380 {offsetof(struct acpi_battery, state), 0},
381 {offsetof(struct acpi_battery, rate_now), 0},
382 {offsetof(struct acpi_battery, capacity_now), 0},
383 {offsetof(struct acpi_battery, voltage_now), 0},
384};
385
386static const struct acpi_offsets info_offsets[] = {
387 {offsetof(struct acpi_battery, power_unit), 0},
388 {offsetof(struct acpi_battery, design_capacity), 0},
389 {offsetof(struct acpi_battery, full_charge_capacity), 0},
390 {offsetof(struct acpi_battery, technology), 0},
391 {offsetof(struct acpi_battery, design_voltage), 0},
392 {offsetof(struct acpi_battery, design_capacity_warning), 0},
393 {offsetof(struct acpi_battery, design_capacity_low), 0},
394 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
395 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
396 {offsetof(struct acpi_battery, model_number), 1},
397 {offsetof(struct acpi_battery, serial_number), 1},
398 {offsetof(struct acpi_battery, type), 1},
399 {offsetof(struct acpi_battery, oem_info), 1},
400};
401
402static const struct acpi_offsets extended_info_offsets[] = {
403 {offsetof(struct acpi_battery, revision), 0},
404 {offsetof(struct acpi_battery, power_unit), 0},
405 {offsetof(struct acpi_battery, design_capacity), 0},
406 {offsetof(struct acpi_battery, full_charge_capacity), 0},
407 {offsetof(struct acpi_battery, technology), 0},
408 {offsetof(struct acpi_battery, design_voltage), 0},
409 {offsetof(struct acpi_battery, design_capacity_warning), 0},
410 {offsetof(struct acpi_battery, design_capacity_low), 0},
411 {offsetof(struct acpi_battery, cycle_count), 0},
412 {offsetof(struct acpi_battery, measurement_accuracy), 0},
413 {offsetof(struct acpi_battery, max_sampling_time), 0},
414 {offsetof(struct acpi_battery, min_sampling_time), 0},
415 {offsetof(struct acpi_battery, max_averaging_interval), 0},
416 {offsetof(struct acpi_battery, min_averaging_interval), 0},
417 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
418 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
419 {offsetof(struct acpi_battery, model_number), 1},
420 {offsetof(struct acpi_battery, serial_number), 1},
421 {offsetof(struct acpi_battery, type), 1},
422 {offsetof(struct acpi_battery, oem_info), 1},
423};
424
425static int extract_package(struct acpi_battery *battery,
426 union acpi_object *package,
427 const struct acpi_offsets *offsets, int num)
428{
429 int i;
430 union acpi_object *element;
431
432 if (package->type != ACPI_TYPE_PACKAGE)
433 return -EFAULT;
434 for (i = 0; i < num; ++i) {
435 if (package->package.count <= i)
436 return -EFAULT;
437 element = &package->package.elements[i];
438 if (offsets[i].mode) {
439 u8 *ptr = (u8 *)battery + offsets[i].offset;
440
441 if (element->type == ACPI_TYPE_STRING ||
442 element->type == ACPI_TYPE_BUFFER)
443 strncpy(ptr, element->string.pointer, 32);
444 else if (element->type == ACPI_TYPE_INTEGER) {
445 strncpy(ptr, (u8 *)&element->integer.value,
446 sizeof(u64));
447 ptr[sizeof(u64)] = 0;
448 } else
449 *ptr = 0; /* don't have value */
450 } else {
451 int *x = (int *)((u8 *)battery + offsets[i].offset);
452 *x = (element->type == ACPI_TYPE_INTEGER) ?
453 element->integer.value : -1;
454 }
455 }
456 return 0;
457}
458
459static int acpi_battery_get_status(struct acpi_battery *battery)
460{
461 if (acpi_bus_get_status(battery->device)) {
462 acpi_handle_info(battery->device->handle,
463 "_STA evaluation failed\n");
464 return -ENODEV;
465 }
466 return 0;
467}
468
469
470static int extract_battery_info(const int use_bix,
471 struct acpi_battery *battery,
472 const struct acpi_buffer *buffer)
473{
474 int result = -EFAULT;
475
476 if (use_bix && battery_bix_broken_package)
477 result = extract_package(battery, buffer->pointer,
478 extended_info_offsets + 1,
479 ARRAY_SIZE(extended_info_offsets) - 1);
480 else if (use_bix)
481 result = extract_package(battery, buffer->pointer,
482 extended_info_offsets,
483 ARRAY_SIZE(extended_info_offsets));
484 else
485 result = extract_package(battery, buffer->pointer,
486 info_offsets, ARRAY_SIZE(info_offsets));
487 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
488 battery->full_charge_capacity = battery->design_capacity;
489 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
490 battery->power_unit && battery->design_voltage) {
491 battery->design_capacity = battery->design_capacity *
492 10000 / battery->design_voltage;
493 battery->full_charge_capacity = battery->full_charge_capacity *
494 10000 / battery->design_voltage;
495 battery->design_capacity_warning =
496 battery->design_capacity_warning *
497 10000 / battery->design_voltage;
498 /* Curiously, design_capacity_low, unlike the rest of them,
499 * is correct.
500 */
501 /* capacity_granularity_* equal 1 on the systems tested, so
502 * it's impossible to tell if they would need an adjustment
503 * or not if their values were higher.
504 */
505 }
506 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
507 battery->capacity_now > battery->full_charge_capacity)
508 battery->capacity_now = battery->full_charge_capacity;
509
510 return result;
511}
512
513static int acpi_battery_get_info(struct acpi_battery *battery)
514{
515 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
516 int use_bix;
517 int result = -ENODEV;
518
519 if (!acpi_battery_present(battery))
520 return 0;
521
522
523 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
524 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
525 acpi_status status = AE_ERROR;
526
527 mutex_lock(&battery->lock);
528 status = acpi_evaluate_object(battery->device->handle,
529 use_bix ? "_BIX":"_BIF",
530 NULL, &buffer);
531 mutex_unlock(&battery->lock);
532
533 if (ACPI_FAILURE(status)) {
534 acpi_handle_info(battery->device->handle,
535 "%s evaluation failed: %s\n",
536 use_bix ? "_BIX":"_BIF",
537 acpi_format_exception(status));
538 } else {
539 result = extract_battery_info(use_bix,
540 battery,
541 &buffer);
542
543 kfree(buffer.pointer);
544 break;
545 }
546 }
547
548 if (!result && !use_bix && xinfo)
549 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
550
551 return result;
552}
553
554static int acpi_battery_get_state(struct acpi_battery *battery)
555{
556 int result = 0;
557 acpi_status status = 0;
558 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
559
560 if (!acpi_battery_present(battery))
561 return 0;
562
563 if (battery->update_time &&
564 time_before(jiffies, battery->update_time +
565 msecs_to_jiffies(cache_time)))
566 return 0;
567
568 mutex_lock(&battery->lock);
569 status = acpi_evaluate_object(battery->device->handle, "_BST",
570 NULL, &buffer);
571 mutex_unlock(&battery->lock);
572
573 if (ACPI_FAILURE(status)) {
574 acpi_handle_info(battery->device->handle,
575 "_BST evaluation failed: %s",
576 acpi_format_exception(status));
577 return -ENODEV;
578 }
579
580 result = extract_package(battery, buffer.pointer,
581 state_offsets, ARRAY_SIZE(state_offsets));
582 battery->update_time = jiffies;
583 kfree(buffer.pointer);
584
585 /* For buggy DSDTs that report negative 16-bit values for either
586 * charging or discharging current and/or report 0 as 65536
587 * due to bad math.
588 */
589 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
590 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
591 (s16)(battery->rate_now) < 0) {
592 battery->rate_now = abs((s16)battery->rate_now);
593 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
594 }
595
596 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
597 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
598 battery->capacity_now = (battery->capacity_now *
599 battery->full_charge_capacity) / 100;
600 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
601 battery->power_unit && battery->design_voltage) {
602 battery->capacity_now = battery->capacity_now *
603 10000 / battery->design_voltage;
604 }
605 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
606 battery->capacity_now > battery->full_charge_capacity)
607 battery->capacity_now = battery->full_charge_capacity;
608
609 return result;
610}
611
612static int acpi_battery_set_alarm(struct acpi_battery *battery)
613{
614 acpi_status status = 0;
615
616 if (!acpi_battery_present(battery) ||
617 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
618 return -ENODEV;
619
620 mutex_lock(&battery->lock);
621 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
622 battery->alarm);
623 mutex_unlock(&battery->lock);
624
625 if (ACPI_FAILURE(status))
626 return -ENODEV;
627
628 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
629 battery->alarm);
630
631 return 0;
632}
633
634static int acpi_battery_init_alarm(struct acpi_battery *battery)
635{
636 /* See if alarms are supported, and if so, set default */
637 if (!acpi_has_method(battery->device->handle, "_BTP")) {
638 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
639 return 0;
640 }
641 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
642 if (!battery->alarm)
643 battery->alarm = battery->design_capacity_warning;
644 return acpi_battery_set_alarm(battery);
645}
646
647static ssize_t acpi_battery_alarm_show(struct device *dev,
648 struct device_attribute *attr,
649 char *buf)
650{
651 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
652
653 return sprintf(buf, "%d\n", battery->alarm * 1000);
654}
655
656static ssize_t acpi_battery_alarm_store(struct device *dev,
657 struct device_attribute *attr,
658 const char *buf, size_t count)
659{
660 unsigned long x;
661 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
662
663 if (sscanf(buf, "%lu\n", &x) == 1)
664 battery->alarm = x/1000;
665 if (acpi_battery_present(battery))
666 acpi_battery_set_alarm(battery);
667 return count;
668}
669
670static const struct device_attribute alarm_attr = {
671 .attr = {.name = "alarm", .mode = 0644},
672 .show = acpi_battery_alarm_show,
673 .store = acpi_battery_alarm_store,
674};
675
676/*
677 * The Battery Hooking API
678 *
679 * This API is used inside other drivers that need to expose
680 * platform-specific behaviour within the generic driver in a
681 * generic way.
682 *
683 */
684
685static LIST_HEAD(acpi_battery_list);
686static LIST_HEAD(battery_hook_list);
687static DEFINE_MUTEX(hook_mutex);
688
689static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
690{
691 struct acpi_battery *battery;
692 /*
693 * In order to remove a hook, we first need to
694 * de-register all the batteries that are registered.
695 */
696 if (lock)
697 mutex_lock(&hook_mutex);
698 list_for_each_entry(battery, &acpi_battery_list, list) {
699 if (!hook->remove_battery(battery->bat, hook))
700 power_supply_changed(battery->bat);
701 }
702 list_del(&hook->list);
703 if (lock)
704 mutex_unlock(&hook_mutex);
705 pr_info("extension unregistered: %s\n", hook->name);
706}
707
708void battery_hook_unregister(struct acpi_battery_hook *hook)
709{
710 __battery_hook_unregister(hook, 1);
711}
712EXPORT_SYMBOL_GPL(battery_hook_unregister);
713
714void battery_hook_register(struct acpi_battery_hook *hook)
715{
716 struct acpi_battery *battery;
717
718 mutex_lock(&hook_mutex);
719 INIT_LIST_HEAD(&hook->list);
720 list_add(&hook->list, &battery_hook_list);
721 /*
722 * Now that the driver is registered, we need
723 * to notify the hook that a battery is available
724 * for each battery, so that the driver may add
725 * its attributes.
726 */
727 list_for_each_entry(battery, &acpi_battery_list, list) {
728 if (hook->add_battery(battery->bat, hook)) {
729 /*
730 * If a add-battery returns non-zero,
731 * the registration of the extension has failed,
732 * and we will not add it to the list of loaded
733 * hooks.
734 */
735 pr_err("extension failed to load: %s", hook->name);
736 __battery_hook_unregister(hook, 0);
737 goto end;
738 }
739
740 power_supply_changed(battery->bat);
741 }
742 pr_info("new extension: %s\n", hook->name);
743end:
744 mutex_unlock(&hook_mutex);
745}
746EXPORT_SYMBOL_GPL(battery_hook_register);
747
748/*
749 * This function gets called right after the battery sysfs
750 * attributes have been added, so that the drivers that
751 * define custom sysfs attributes can add their own.
752 */
753static void battery_hook_add_battery(struct acpi_battery *battery)
754{
755 struct acpi_battery_hook *hook_node, *tmp;
756
757 mutex_lock(&hook_mutex);
758 INIT_LIST_HEAD(&battery->list);
759 list_add(&battery->list, &acpi_battery_list);
760 /*
761 * Since we added a new battery to the list, we need to
762 * iterate over the hooks and call add_battery for each
763 * hook that was registered. This usually happens
764 * when a battery gets hotplugged or initialized
765 * during the battery module initialization.
766 */
767 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
768 if (hook_node->add_battery(battery->bat, hook_node)) {
769 /*
770 * The notification of the extensions has failed, to
771 * prevent further errors we will unload the extension.
772 */
773 pr_err("error in extension, unloading: %s",
774 hook_node->name);
775 __battery_hook_unregister(hook_node, 0);
776 }
777 }
778 mutex_unlock(&hook_mutex);
779}
780
781static void battery_hook_remove_battery(struct acpi_battery *battery)
782{
783 struct acpi_battery_hook *hook;
784
785 mutex_lock(&hook_mutex);
786 /*
787 * Before removing the hook, we need to remove all
788 * custom attributes from the battery.
789 */
790 list_for_each_entry(hook, &battery_hook_list, list) {
791 hook->remove_battery(battery->bat, hook);
792 }
793 /* Then, just remove the battery from the list */
794 list_del(&battery->list);
795 mutex_unlock(&hook_mutex);
796}
797
798static void __exit battery_hook_exit(void)
799{
800 struct acpi_battery_hook *hook;
801 struct acpi_battery_hook *ptr;
802 /*
803 * At this point, the acpi_bus_unregister_driver()
804 * has called remove for all batteries. We just
805 * need to remove the hooks.
806 */
807 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
808 __battery_hook_unregister(hook, 1);
809 }
810 mutex_destroy(&hook_mutex);
811}
812
813static int sysfs_add_battery(struct acpi_battery *battery)
814{
815 struct power_supply_config psy_cfg = { .drv_data = battery, };
816 bool full_cap_broken = false;
817
818 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
819 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
820 full_cap_broken = true;
821
822 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
823 if (full_cap_broken) {
824 battery->bat_desc.properties =
825 charge_battery_full_cap_broken_props;
826 battery->bat_desc.num_properties =
827 ARRAY_SIZE(charge_battery_full_cap_broken_props);
828 } else {
829 battery->bat_desc.properties = charge_battery_props;
830 battery->bat_desc.num_properties =
831 ARRAY_SIZE(charge_battery_props);
832 }
833 } else {
834 if (full_cap_broken) {
835 battery->bat_desc.properties =
836 energy_battery_full_cap_broken_props;
837 battery->bat_desc.num_properties =
838 ARRAY_SIZE(energy_battery_full_cap_broken_props);
839 } else {
840 battery->bat_desc.properties = energy_battery_props;
841 battery->bat_desc.num_properties =
842 ARRAY_SIZE(energy_battery_props);
843 }
844 }
845
846 battery->bat_desc.name = acpi_device_bid(battery->device);
847 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
848 battery->bat_desc.get_property = acpi_battery_get_property;
849
850 battery->bat = power_supply_register_no_ws(&battery->device->dev,
851 &battery->bat_desc, &psy_cfg);
852
853 if (IS_ERR(battery->bat)) {
854 int result = PTR_ERR(battery->bat);
855
856 battery->bat = NULL;
857 return result;
858 }
859 battery_hook_add_battery(battery);
860 return device_create_file(&battery->bat->dev, &alarm_attr);
861}
862
863static void sysfs_remove_battery(struct acpi_battery *battery)
864{
865 mutex_lock(&battery->sysfs_lock);
866 if (!battery->bat) {
867 mutex_unlock(&battery->sysfs_lock);
868 return;
869 }
870 battery_hook_remove_battery(battery);
871 device_remove_file(&battery->bat->dev, &alarm_attr);
872 power_supply_unregister(battery->bat);
873 battery->bat = NULL;
874 mutex_unlock(&battery->sysfs_lock);
875}
876
877static void find_battery(const struct dmi_header *dm, void *private)
878{
879 struct acpi_battery *battery = (struct acpi_battery *)private;
880 /* Note: the hardcoded offsets below have been extracted from
881 * the source code of dmidecode.
882 */
883 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
884 const u8 *dmi_data = (const u8 *)(dm + 1);
885 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
886
887 if (dm->length >= 18)
888 dmi_capacity *= dmi_data[17];
889 if (battery->design_capacity * battery->design_voltage / 1000
890 != dmi_capacity &&
891 battery->design_capacity * 10 == dmi_capacity)
892 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
893 &battery->flags);
894 }
895}
896
897/*
898 * According to the ACPI spec, some kinds of primary batteries can
899 * report percentage battery remaining capacity directly to OS.
900 * In this case, it reports the Last Full Charged Capacity == 100
901 * and BatteryPresentRate == 0xFFFFFFFF.
902 *
903 * Now we found some battery reports percentage remaining capacity
904 * even if it's rechargeable.
905 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
906 *
907 * Handle this correctly so that they won't break userspace.
908 */
909static void acpi_battery_quirks(struct acpi_battery *battery)
910{
911 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
912 return;
913
914 if (battery->full_charge_capacity == 100 &&
915 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
916 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
917 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
918 battery->full_charge_capacity = battery->design_capacity;
919 battery->capacity_now = (battery->capacity_now *
920 battery->full_charge_capacity) / 100;
921 }
922
923 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
924 return;
925
926 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
927 const char *s;
928
929 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
930 if (s && !strncasecmp(s, "ThinkPad", 8)) {
931 dmi_walk(find_battery, battery);
932 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
933 &battery->flags) &&
934 battery->design_voltage) {
935 battery->design_capacity =
936 battery->design_capacity *
937 10000 / battery->design_voltage;
938 battery->full_charge_capacity =
939 battery->full_charge_capacity *
940 10000 / battery->design_voltage;
941 battery->design_capacity_warning =
942 battery->design_capacity_warning *
943 10000 / battery->design_voltage;
944 battery->capacity_now = battery->capacity_now *
945 10000 / battery->design_voltage;
946 }
947 }
948 }
949
950 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
951 return;
952
953 if (acpi_battery_is_degraded(battery) &&
954 battery->capacity_now > battery->full_charge_capacity) {
955 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
956 battery->capacity_now = battery->full_charge_capacity;
957 }
958}
959
960static int acpi_battery_update(struct acpi_battery *battery, bool resume)
961{
962 int result = acpi_battery_get_status(battery);
963
964 if (result)
965 return result;
966
967 if (!acpi_battery_present(battery)) {
968 sysfs_remove_battery(battery);
969 battery->update_time = 0;
970 return 0;
971 }
972
973 if (resume)
974 return 0;
975
976 if (!battery->update_time) {
977 result = acpi_battery_get_info(battery);
978 if (result)
979 return result;
980 acpi_battery_init_alarm(battery);
981 }
982
983 result = acpi_battery_get_state(battery);
984 if (result)
985 return result;
986 acpi_battery_quirks(battery);
987
988 if (!battery->bat) {
989 result = sysfs_add_battery(battery);
990 if (result)
991 return result;
992 }
993
994 /*
995 * Wakeup the system if battery is critical low
996 * or lower than the alarm level
997 */
998 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
999 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1000 (battery->capacity_now <= battery->alarm)))
1001 acpi_pm_wakeup_event(&battery->device->dev);
1002
1003 return result;
1004}
1005
1006static void acpi_battery_refresh(struct acpi_battery *battery)
1007{
1008 int power_unit;
1009
1010 if (!battery->bat)
1011 return;
1012
1013 power_unit = battery->power_unit;
1014
1015 acpi_battery_get_info(battery);
1016
1017 if (power_unit == battery->power_unit)
1018 return;
1019
1020 /* The battery has changed its reporting units. */
1021 sysfs_remove_battery(battery);
1022 sysfs_add_battery(battery);
1023}
1024
1025/* Driver Interface */
1026static void acpi_battery_notify(struct acpi_device *device, u32 event)
1027{
1028 struct acpi_battery *battery = acpi_driver_data(device);
1029 struct power_supply *old;
1030
1031 if (!battery)
1032 return;
1033 old = battery->bat;
1034 /*
1035 * On Acer Aspire V5-573G notifications are sometimes triggered too
1036 * early. For example, when AC is unplugged and notification is
1037 * triggered, battery state is still reported as "Full", and changes to
1038 * "Discharging" only after short delay, without any notification.
1039 */
1040 if (battery_notification_delay_ms > 0)
1041 msleep(battery_notification_delay_ms);
1042 if (event == ACPI_BATTERY_NOTIFY_INFO)
1043 acpi_battery_refresh(battery);
1044 acpi_battery_update(battery, false);
1045 acpi_bus_generate_netlink_event(device->pnp.device_class,
1046 dev_name(&device->dev), event,
1047 acpi_battery_present(battery));
1048 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1049 /* acpi_battery_update could remove power_supply object */
1050 if (old && battery->bat)
1051 power_supply_changed(battery->bat);
1052}
1053
1054static int battery_notify(struct notifier_block *nb,
1055 unsigned long mode, void *_unused)
1056{
1057 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1058 pm_nb);
1059 int result;
1060
1061 switch (mode) {
1062 case PM_POST_HIBERNATION:
1063 case PM_POST_SUSPEND:
1064 if (!acpi_battery_present(battery))
1065 return 0;
1066
1067 if (battery->bat) {
1068 acpi_battery_refresh(battery);
1069 } else {
1070 result = acpi_battery_get_info(battery);
1071 if (result)
1072 return result;
1073
1074 result = sysfs_add_battery(battery);
1075 if (result)
1076 return result;
1077 }
1078
1079 acpi_battery_init_alarm(battery);
1080 acpi_battery_get_state(battery);
1081 break;
1082 }
1083
1084 return 0;
1085}
1086
1087static int __init
1088battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1089{
1090 battery_bix_broken_package = 1;
1091 return 0;
1092}
1093
1094static int __init
1095battery_notification_delay_quirk(const struct dmi_system_id *d)
1096{
1097 battery_notification_delay_ms = 1000;
1098 return 0;
1099}
1100
1101static int __init
1102battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1103{
1104 battery_ac_is_broken = 1;
1105 return 0;
1106}
1107
1108static const struct dmi_system_id bat_dmi_table[] __initconst = {
1109 {
1110 /* NEC LZ750/LS */
1111 .callback = battery_bix_broken_package_quirk,
1112 .matches = {
1113 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1114 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1115 },
1116 },
1117 {
1118 /* Acer Aspire V5-573G */
1119 .callback = battery_notification_delay_quirk,
1120 .matches = {
1121 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1122 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1123 },
1124 },
1125 {
1126 /* Point of View mobii wintab p800w */
1127 .callback = battery_ac_is_broken_quirk,
1128 .matches = {
1129 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1130 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1131 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1132 /* Above matches are too generic, add bios-date match */
1133 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1134 },
1135 },
1136 {
1137 /* Microsoft Surface Go 3 */
1138 .callback = battery_notification_delay_quirk,
1139 .matches = {
1140 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1141 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1142 },
1143 },
1144 {},
1145};
1146
1147/*
1148 * Some machines'(E,G Lenovo Z480) ECs are not stable
1149 * during boot up and this causes battery driver fails to be
1150 * probed due to failure of getting battery information
1151 * from EC sometimes. After several retries, the operation
1152 * may work. So add retry code here and 20ms sleep between
1153 * every retries.
1154 */
1155static int acpi_battery_update_retry(struct acpi_battery *battery)
1156{
1157 int retry, ret;
1158
1159 for (retry = 5; retry; retry--) {
1160 ret = acpi_battery_update(battery, false);
1161 if (!ret)
1162 break;
1163
1164 msleep(20);
1165 }
1166 return ret;
1167}
1168
1169static int acpi_battery_add(struct acpi_device *device)
1170{
1171 int result = 0;
1172 struct acpi_battery *battery = NULL;
1173
1174 if (!device)
1175 return -EINVAL;
1176
1177 if (device->dep_unmet)
1178 return -EPROBE_DEFER;
1179
1180 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1181 if (!battery)
1182 return -ENOMEM;
1183 battery->device = device;
1184 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1185 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1186 device->driver_data = battery;
1187 mutex_init(&battery->lock);
1188 mutex_init(&battery->sysfs_lock);
1189 if (acpi_has_method(battery->device->handle, "_BIX"))
1190 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1191
1192 result = acpi_battery_update_retry(battery);
1193 if (result)
1194 goto fail;
1195
1196 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1197 device->status.battery_present ? "present" : "absent");
1198
1199 battery->pm_nb.notifier_call = battery_notify;
1200 register_pm_notifier(&battery->pm_nb);
1201
1202 device_init_wakeup(&device->dev, 1);
1203
1204 return result;
1205
1206fail:
1207 sysfs_remove_battery(battery);
1208 mutex_destroy(&battery->lock);
1209 mutex_destroy(&battery->sysfs_lock);
1210 kfree(battery);
1211 return result;
1212}
1213
1214static void acpi_battery_remove(struct acpi_device *device)
1215{
1216 struct acpi_battery *battery = NULL;
1217
1218 if (!device || !acpi_driver_data(device))
1219 return;
1220 device_init_wakeup(&device->dev, 0);
1221 battery = acpi_driver_data(device);
1222 unregister_pm_notifier(&battery->pm_nb);
1223 sysfs_remove_battery(battery);
1224 mutex_destroy(&battery->lock);
1225 mutex_destroy(&battery->sysfs_lock);
1226 kfree(battery);
1227}
1228
1229#ifdef CONFIG_PM_SLEEP
1230/* this is needed to learn about changes made in suspended state */
1231static int acpi_battery_resume(struct device *dev)
1232{
1233 struct acpi_battery *battery;
1234
1235 if (!dev)
1236 return -EINVAL;
1237
1238 battery = acpi_driver_data(to_acpi_device(dev));
1239 if (!battery)
1240 return -EINVAL;
1241
1242 battery->update_time = 0;
1243 acpi_battery_update(battery, true);
1244 return 0;
1245}
1246#else
1247#define acpi_battery_resume NULL
1248#endif
1249
1250static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1251
1252static struct acpi_driver acpi_battery_driver = {
1253 .name = "battery",
1254 .class = ACPI_BATTERY_CLASS,
1255 .ids = battery_device_ids,
1256 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1257 .ops = {
1258 .add = acpi_battery_add,
1259 .remove = acpi_battery_remove,
1260 .notify = acpi_battery_notify,
1261 },
1262 .drv.pm = &acpi_battery_pm,
1263};
1264
1265static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1266{
1267 int result;
1268
1269 if (acpi_quirk_skip_acpi_ac_and_battery())
1270 return;
1271
1272 dmi_check_system(bat_dmi_table);
1273
1274 result = acpi_bus_register_driver(&acpi_battery_driver);
1275 battery_driver_registered = (result == 0);
1276}
1277
1278static int __init acpi_battery_init(void)
1279{
1280 if (acpi_disabled)
1281 return -ENODEV;
1282
1283 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1284 return 0;
1285}
1286
1287static void __exit acpi_battery_exit(void)
1288{
1289 async_synchronize_cookie(async_cookie + 1);
1290 if (battery_driver_registered) {
1291 acpi_bus_unregister_driver(&acpi_battery_driver);
1292 battery_hook_exit();
1293 }
1294}
1295
1296module_init(acpi_battery_init);
1297module_exit(acpi_battery_exit);