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
45 MODULE_AUTHOR("Paul Diefenbaugh");
46 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
47 MODULE_DESCRIPTION("ACPI Battery Driver");
48 MODULE_LICENSE("GPL");
49
50 static async_cookie_t async_cookie;
51 static bool battery_driver_registered;
52 static int battery_bix_broken_package;
53 static int battery_notification_delay_ms;
54 static int battery_ac_is_broken;
55 static unsigned int cache_time = 1000;
56 module_param(cache_time, uint, 0644);
57 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
58
59 static 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
68 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
69
70 enum {
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
93 struct 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
acpi_battery_present(struct acpi_battery * battery)132 static inline int acpi_battery_present(struct acpi_battery *battery)
133 {
134 return battery->device->status.battery_present;
135 }
136
acpi_battery_technology(struct acpi_battery * battery)137 static 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
152 static int acpi_battery_get_state(struct acpi_battery *battery);
153
acpi_battery_is_charged(struct acpi_battery * battery)154 static 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
acpi_battery_is_degraded(struct acpi_battery * battery)177 static 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
acpi_battery_handle_discharging(struct acpi_battery * battery)184 static 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
acpi_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)198 static 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
309 static 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
327 static 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
341 static 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
359 static 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 */
374 struct acpi_offsets {
375 size_t offset; /* offset inside struct acpi_sbs_battery */
376 u8 mode; /* int or string? */
377 };
378
379 static 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
386 static 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
402 static 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
extract_package(struct acpi_battery * battery,union acpi_object * package,const struct acpi_offsets * offsets,int num)425 static 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
acpi_battery_get_status(struct acpi_battery * battery)459 static 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
extract_battery_info(const int use_bix,struct acpi_battery * battery,const struct acpi_buffer * buffer)470 static 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
acpi_battery_get_info(struct acpi_battery * battery)513 static 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
acpi_battery_get_state(struct acpi_battery * battery)554 static 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
acpi_battery_set_alarm(struct acpi_battery * battery)612 static 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
acpi_battery_init_alarm(struct acpi_battery * battery)634 static 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
acpi_battery_alarm_show(struct device * dev,struct device_attribute * attr,char * buf)647 static 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
acpi_battery_alarm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)656 static 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
670 static 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
685 static LIST_HEAD(acpi_battery_list);
686 static LIST_HEAD(battery_hook_list);
687 static DEFINE_MUTEX(hook_mutex);
688
__battery_hook_unregister(struct acpi_battery_hook * hook,int lock)689 static 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 hook->remove_battery(battery->bat);
700 }
701 list_del(&hook->list);
702 if (lock)
703 mutex_unlock(&hook_mutex);
704 pr_info("extension unregistered: %s\n", hook->name);
705 }
706
battery_hook_unregister(struct acpi_battery_hook * hook)707 void battery_hook_unregister(struct acpi_battery_hook *hook)
708 {
709 __battery_hook_unregister(hook, 1);
710 }
711 EXPORT_SYMBOL_GPL(battery_hook_unregister);
712
battery_hook_register(struct acpi_battery_hook * hook)713 void battery_hook_register(struct acpi_battery_hook *hook)
714 {
715 struct acpi_battery *battery;
716
717 mutex_lock(&hook_mutex);
718 INIT_LIST_HEAD(&hook->list);
719 list_add(&hook->list, &battery_hook_list);
720 /*
721 * Now that the driver is registered, we need
722 * to notify the hook that a battery is available
723 * for each battery, so that the driver may add
724 * its attributes.
725 */
726 list_for_each_entry(battery, &acpi_battery_list, list) {
727 if (hook->add_battery(battery->bat)) {
728 /*
729 * If a add-battery returns non-zero,
730 * the registration of the extension has failed,
731 * and we will not add it to the list of loaded
732 * hooks.
733 */
734 pr_err("extension failed to load: %s", hook->name);
735 __battery_hook_unregister(hook, 0);
736 goto end;
737 }
738 }
739 pr_info("new extension: %s\n", hook->name);
740 end:
741 mutex_unlock(&hook_mutex);
742 }
743 EXPORT_SYMBOL_GPL(battery_hook_register);
744
745 /*
746 * This function gets called right after the battery sysfs
747 * attributes have been added, so that the drivers that
748 * define custom sysfs attributes can add their own.
749 */
battery_hook_add_battery(struct acpi_battery * battery)750 static void battery_hook_add_battery(struct acpi_battery *battery)
751 {
752 struct acpi_battery_hook *hook_node, *tmp;
753
754 mutex_lock(&hook_mutex);
755 INIT_LIST_HEAD(&battery->list);
756 list_add(&battery->list, &acpi_battery_list);
757 /*
758 * Since we added a new battery to the list, we need to
759 * iterate over the hooks and call add_battery for each
760 * hook that was registered. This usually happens
761 * when a battery gets hotplugged or initialized
762 * during the battery module initialization.
763 */
764 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
765 if (hook_node->add_battery(battery->bat)) {
766 /*
767 * The notification of the extensions has failed, to
768 * prevent further errors we will unload the extension.
769 */
770 pr_err("error in extension, unloading: %s",
771 hook_node->name);
772 __battery_hook_unregister(hook_node, 0);
773 }
774 }
775 mutex_unlock(&hook_mutex);
776 }
777
battery_hook_remove_battery(struct acpi_battery * battery)778 static void battery_hook_remove_battery(struct acpi_battery *battery)
779 {
780 struct acpi_battery_hook *hook;
781
782 mutex_lock(&hook_mutex);
783 /*
784 * Before removing the hook, we need to remove all
785 * custom attributes from the battery.
786 */
787 list_for_each_entry(hook, &battery_hook_list, list) {
788 hook->remove_battery(battery->bat);
789 }
790 /* Then, just remove the battery from the list */
791 list_del(&battery->list);
792 mutex_unlock(&hook_mutex);
793 }
794
battery_hook_exit(void)795 static void __exit battery_hook_exit(void)
796 {
797 struct acpi_battery_hook *hook;
798 struct acpi_battery_hook *ptr;
799 /*
800 * At this point, the acpi_bus_unregister_driver()
801 * has called remove for all batteries. We just
802 * need to remove the hooks.
803 */
804 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
805 __battery_hook_unregister(hook, 1);
806 }
807 mutex_destroy(&hook_mutex);
808 }
809
sysfs_add_battery(struct acpi_battery * battery)810 static int sysfs_add_battery(struct acpi_battery *battery)
811 {
812 struct power_supply_config psy_cfg = { .drv_data = battery, };
813 bool full_cap_broken = false;
814
815 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
816 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
817 full_cap_broken = true;
818
819 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
820 if (full_cap_broken) {
821 battery->bat_desc.properties =
822 charge_battery_full_cap_broken_props;
823 battery->bat_desc.num_properties =
824 ARRAY_SIZE(charge_battery_full_cap_broken_props);
825 } else {
826 battery->bat_desc.properties = charge_battery_props;
827 battery->bat_desc.num_properties =
828 ARRAY_SIZE(charge_battery_props);
829 }
830 } else {
831 if (full_cap_broken) {
832 battery->bat_desc.properties =
833 energy_battery_full_cap_broken_props;
834 battery->bat_desc.num_properties =
835 ARRAY_SIZE(energy_battery_full_cap_broken_props);
836 } else {
837 battery->bat_desc.properties = energy_battery_props;
838 battery->bat_desc.num_properties =
839 ARRAY_SIZE(energy_battery_props);
840 }
841 }
842
843 battery->bat_desc.name = acpi_device_bid(battery->device);
844 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
845 battery->bat_desc.get_property = acpi_battery_get_property;
846
847 battery->bat = power_supply_register_no_ws(&battery->device->dev,
848 &battery->bat_desc, &psy_cfg);
849
850 if (IS_ERR(battery->bat)) {
851 int result = PTR_ERR(battery->bat);
852
853 battery->bat = NULL;
854 return result;
855 }
856 battery_hook_add_battery(battery);
857 return device_create_file(&battery->bat->dev, &alarm_attr);
858 }
859
sysfs_remove_battery(struct acpi_battery * battery)860 static void sysfs_remove_battery(struct acpi_battery *battery)
861 {
862 mutex_lock(&battery->sysfs_lock);
863 if (!battery->bat) {
864 mutex_unlock(&battery->sysfs_lock);
865 return;
866 }
867 battery_hook_remove_battery(battery);
868 device_remove_file(&battery->bat->dev, &alarm_attr);
869 power_supply_unregister(battery->bat);
870 battery->bat = NULL;
871 mutex_unlock(&battery->sysfs_lock);
872 }
873
find_battery(const struct dmi_header * dm,void * private)874 static void find_battery(const struct dmi_header *dm, void *private)
875 {
876 struct acpi_battery *battery = (struct acpi_battery *)private;
877 /* Note: the hardcoded offsets below have been extracted from
878 * the source code of dmidecode.
879 */
880 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
881 const u8 *dmi_data = (const u8 *)(dm + 1);
882 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
883
884 if (dm->length >= 18)
885 dmi_capacity *= dmi_data[17];
886 if (battery->design_capacity * battery->design_voltage / 1000
887 != dmi_capacity &&
888 battery->design_capacity * 10 == dmi_capacity)
889 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
890 &battery->flags);
891 }
892 }
893
894 /*
895 * According to the ACPI spec, some kinds of primary batteries can
896 * report percentage battery remaining capacity directly to OS.
897 * In this case, it reports the Last Full Charged Capacity == 100
898 * and BatteryPresentRate == 0xFFFFFFFF.
899 *
900 * Now we found some battery reports percentage remaining capacity
901 * even if it's rechargeable.
902 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
903 *
904 * Handle this correctly so that they won't break userspace.
905 */
acpi_battery_quirks(struct acpi_battery * battery)906 static void acpi_battery_quirks(struct acpi_battery *battery)
907 {
908 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
909 return;
910
911 if (battery->full_charge_capacity == 100 &&
912 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
913 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
914 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
915 battery->full_charge_capacity = battery->design_capacity;
916 battery->capacity_now = (battery->capacity_now *
917 battery->full_charge_capacity) / 100;
918 }
919
920 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
921 return;
922
923 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
924 const char *s;
925
926 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
927 if (s && !strncasecmp(s, "ThinkPad", 8)) {
928 dmi_walk(find_battery, battery);
929 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
930 &battery->flags) &&
931 battery->design_voltage) {
932 battery->design_capacity =
933 battery->design_capacity *
934 10000 / battery->design_voltage;
935 battery->full_charge_capacity =
936 battery->full_charge_capacity *
937 10000 / battery->design_voltage;
938 battery->design_capacity_warning =
939 battery->design_capacity_warning *
940 10000 / battery->design_voltage;
941 battery->capacity_now = battery->capacity_now *
942 10000 / battery->design_voltage;
943 }
944 }
945 }
946
947 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
948 return;
949
950 if (acpi_battery_is_degraded(battery) &&
951 battery->capacity_now > battery->full_charge_capacity) {
952 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
953 battery->capacity_now = battery->full_charge_capacity;
954 }
955 }
956
acpi_battery_update(struct acpi_battery * battery,bool resume)957 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
958 {
959 int result = acpi_battery_get_status(battery);
960
961 if (result)
962 return result;
963
964 if (!acpi_battery_present(battery)) {
965 sysfs_remove_battery(battery);
966 battery->update_time = 0;
967 return 0;
968 }
969
970 if (resume)
971 return 0;
972
973 if (!battery->update_time) {
974 result = acpi_battery_get_info(battery);
975 if (result)
976 return result;
977 acpi_battery_init_alarm(battery);
978 }
979
980 result = acpi_battery_get_state(battery);
981 if (result)
982 return result;
983 acpi_battery_quirks(battery);
984
985 if (!battery->bat) {
986 result = sysfs_add_battery(battery);
987 if (result)
988 return result;
989 }
990
991 /*
992 * Wakeup the system if battery is critical low
993 * or lower than the alarm level
994 */
995 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
996 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
997 (battery->capacity_now <= battery->alarm)))
998 acpi_pm_wakeup_event(&battery->device->dev);
999
1000 return result;
1001 }
1002
acpi_battery_refresh(struct acpi_battery * battery)1003 static void acpi_battery_refresh(struct acpi_battery *battery)
1004 {
1005 int power_unit;
1006
1007 if (!battery->bat)
1008 return;
1009
1010 power_unit = battery->power_unit;
1011
1012 acpi_battery_get_info(battery);
1013
1014 if (power_unit == battery->power_unit)
1015 return;
1016
1017 /* The battery has changed its reporting units. */
1018 sysfs_remove_battery(battery);
1019 sysfs_add_battery(battery);
1020 }
1021
1022 /* Driver Interface */
acpi_battery_notify(struct acpi_device * device,u32 event)1023 static void acpi_battery_notify(struct acpi_device *device, u32 event)
1024 {
1025 struct acpi_battery *battery = acpi_driver_data(device);
1026 struct power_supply *old;
1027
1028 if (!battery)
1029 return;
1030 old = battery->bat;
1031 /*
1032 * On Acer Aspire V5-573G notifications are sometimes triggered too
1033 * early. For example, when AC is unplugged and notification is
1034 * triggered, battery state is still reported as "Full", and changes to
1035 * "Discharging" only after short delay, without any notification.
1036 */
1037 if (battery_notification_delay_ms > 0)
1038 msleep(battery_notification_delay_ms);
1039 if (event == ACPI_BATTERY_NOTIFY_INFO)
1040 acpi_battery_refresh(battery);
1041 acpi_battery_update(battery, false);
1042 acpi_bus_generate_netlink_event(device->pnp.device_class,
1043 dev_name(&device->dev), event,
1044 acpi_battery_present(battery));
1045 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1046 /* acpi_battery_update could remove power_supply object */
1047 if (old && battery->bat)
1048 power_supply_changed(battery->bat);
1049 }
1050
battery_notify(struct notifier_block * nb,unsigned long mode,void * _unused)1051 static int battery_notify(struct notifier_block *nb,
1052 unsigned long mode, void *_unused)
1053 {
1054 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1055 pm_nb);
1056 int result;
1057
1058 switch (mode) {
1059 case PM_POST_HIBERNATION:
1060 case PM_POST_SUSPEND:
1061 if (!acpi_battery_present(battery))
1062 return 0;
1063
1064 if (battery->bat) {
1065 acpi_battery_refresh(battery);
1066 } else {
1067 result = acpi_battery_get_info(battery);
1068 if (result)
1069 return result;
1070
1071 result = sysfs_add_battery(battery);
1072 if (result)
1073 return result;
1074 }
1075
1076 acpi_battery_init_alarm(battery);
1077 acpi_battery_get_state(battery);
1078 break;
1079 }
1080
1081 return 0;
1082 }
1083
1084 static int __init
battery_bix_broken_package_quirk(const struct dmi_system_id * d)1085 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1086 {
1087 battery_bix_broken_package = 1;
1088 return 0;
1089 }
1090
1091 static int __init
battery_notification_delay_quirk(const struct dmi_system_id * d)1092 battery_notification_delay_quirk(const struct dmi_system_id *d)
1093 {
1094 battery_notification_delay_ms = 1000;
1095 return 0;
1096 }
1097
1098 static int __init
battery_ac_is_broken_quirk(const struct dmi_system_id * d)1099 battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1100 {
1101 battery_ac_is_broken = 1;
1102 return 0;
1103 }
1104
1105 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1106 {
1107 /* NEC LZ750/LS */
1108 .callback = battery_bix_broken_package_quirk,
1109 .matches = {
1110 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1111 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1112 },
1113 },
1114 {
1115 /* Acer Aspire V5-573G */
1116 .callback = battery_notification_delay_quirk,
1117 .matches = {
1118 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1119 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1120 },
1121 },
1122 {
1123 /* Point of View mobii wintab p800w */
1124 .callback = battery_ac_is_broken_quirk,
1125 .matches = {
1126 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1127 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1128 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1129 /* Above matches are too generic, add bios-date match */
1130 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1131 },
1132 },
1133 {
1134 /* Microsoft Surface Go 3 */
1135 .callback = battery_notification_delay_quirk,
1136 .matches = {
1137 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1138 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1139 },
1140 },
1141 {},
1142 };
1143
1144 /*
1145 * Some machines'(E,G Lenovo Z480) ECs are not stable
1146 * during boot up and this causes battery driver fails to be
1147 * probed due to failure of getting battery information
1148 * from EC sometimes. After several retries, the operation
1149 * may work. So add retry code here and 20ms sleep between
1150 * every retries.
1151 */
acpi_battery_update_retry(struct acpi_battery * battery)1152 static int acpi_battery_update_retry(struct acpi_battery *battery)
1153 {
1154 int retry, ret;
1155
1156 for (retry = 5; retry; retry--) {
1157 ret = acpi_battery_update(battery, false);
1158 if (!ret)
1159 break;
1160
1161 msleep(20);
1162 }
1163 return ret;
1164 }
1165
acpi_battery_add(struct acpi_device * device)1166 static int acpi_battery_add(struct acpi_device *device)
1167 {
1168 int result = 0;
1169 struct acpi_battery *battery = NULL;
1170
1171 if (!device)
1172 return -EINVAL;
1173
1174 if (device->dep_unmet)
1175 return -EPROBE_DEFER;
1176
1177 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1178 if (!battery)
1179 return -ENOMEM;
1180 battery->device = device;
1181 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1182 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1183 device->driver_data = battery;
1184 mutex_init(&battery->lock);
1185 mutex_init(&battery->sysfs_lock);
1186 if (acpi_has_method(battery->device->handle, "_BIX"))
1187 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1188
1189 result = acpi_battery_update_retry(battery);
1190 if (result)
1191 goto fail;
1192
1193 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1194 device->status.battery_present ? "present" : "absent");
1195
1196 battery->pm_nb.notifier_call = battery_notify;
1197 register_pm_notifier(&battery->pm_nb);
1198
1199 device_init_wakeup(&device->dev, 1);
1200
1201 return result;
1202
1203 fail:
1204 sysfs_remove_battery(battery);
1205 mutex_destroy(&battery->lock);
1206 mutex_destroy(&battery->sysfs_lock);
1207 kfree(battery);
1208 return result;
1209 }
1210
acpi_battery_remove(struct acpi_device * device)1211 static int acpi_battery_remove(struct acpi_device *device)
1212 {
1213 struct acpi_battery *battery = NULL;
1214
1215 if (!device || !acpi_driver_data(device))
1216 return -EINVAL;
1217 device_init_wakeup(&device->dev, 0);
1218 battery = acpi_driver_data(device);
1219 unregister_pm_notifier(&battery->pm_nb);
1220 sysfs_remove_battery(battery);
1221 mutex_destroy(&battery->lock);
1222 mutex_destroy(&battery->sysfs_lock);
1223 kfree(battery);
1224 return 0;
1225 }
1226
1227 #ifdef CONFIG_PM_SLEEP
1228 /* this is needed to learn about changes made in suspended state */
acpi_battery_resume(struct device * dev)1229 static int acpi_battery_resume(struct device *dev)
1230 {
1231 struct acpi_battery *battery;
1232
1233 if (!dev)
1234 return -EINVAL;
1235
1236 battery = acpi_driver_data(to_acpi_device(dev));
1237 if (!battery)
1238 return -EINVAL;
1239
1240 battery->update_time = 0;
1241 acpi_battery_update(battery, true);
1242 return 0;
1243 }
1244 #else
1245 #define acpi_battery_resume NULL
1246 #endif
1247
1248 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1249
1250 static struct acpi_driver acpi_battery_driver = {
1251 .name = "battery",
1252 .class = ACPI_BATTERY_CLASS,
1253 .ids = battery_device_ids,
1254 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1255 .ops = {
1256 .add = acpi_battery_add,
1257 .remove = acpi_battery_remove,
1258 .notify = acpi_battery_notify,
1259 },
1260 .drv.pm = &acpi_battery_pm,
1261 };
1262
acpi_battery_init_async(void * unused,async_cookie_t cookie)1263 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1264 {
1265 int result;
1266
1267 if (acpi_quirk_skip_acpi_ac_and_battery())
1268 return;
1269
1270 dmi_check_system(bat_dmi_table);
1271
1272 result = acpi_bus_register_driver(&acpi_battery_driver);
1273 battery_driver_registered = (result == 0);
1274 }
1275
acpi_battery_init(void)1276 static int __init acpi_battery_init(void)
1277 {
1278 if (acpi_disabled)
1279 return -ENODEV;
1280
1281 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1282 return 0;
1283 }
1284
acpi_battery_exit(void)1285 static void __exit acpi_battery_exit(void)
1286 {
1287 async_synchronize_cookie(async_cookie + 1);
1288 if (battery_driver_registered) {
1289 acpi_bus_unregister_driver(&acpi_battery_driver);
1290 battery_hook_exit();
1291 }
1292 }
1293
1294 module_init(acpi_battery_init);
1295 module_exit(acpi_battery_exit);
1296