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 #define MAX_STRING_LENGTH 64
46
47 MODULE_AUTHOR("Paul Diefenbaugh");
48 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
49 MODULE_DESCRIPTION("ACPI Battery Driver");
50 MODULE_LICENSE("GPL");
51
52 static async_cookie_t async_cookie;
53 static bool battery_driver_registered;
54 static int battery_bix_broken_package;
55 static int battery_notification_delay_ms;
56 static int battery_ac_is_broken;
57 static unsigned int cache_time = 1000;
58 module_param(cache_time, uint, 0644);
59 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
60
61 static const struct acpi_device_id battery_device_ids[] = {
62 {"PNP0C0A", 0},
63
64 /* Microsoft Surface Go 3 */
65 {"MSHW0146", 0},
66
67 {"", 0},
68 };
69
70 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
71
72 enum {
73 ACPI_BATTERY_ALARM_PRESENT,
74 ACPI_BATTERY_XINFO_PRESENT,
75 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
76 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
77 * switches between mWh and mAh depending on whether the system
78 * is running on battery or not. When mAh is the unit, most
79 * reported values are incorrect and need to be adjusted by
80 * 10000/design_voltage. Verified on x201, t410, t410s, and x220.
81 * Pre-2010 and 2012 models appear to always report in mWh and
82 * are thus unaffected (tested with t42, t61, t500, x200, x300,
83 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for
84 * the 2011 models that fixes the issue (tested on x220 with a
85 * post-1.29 BIOS), but as of Nov. 2012, no such update is
86 * available for the 2010 models.
87 */
88 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
89 /* for batteries reporting current capacity with design capacity
90 * on a full charge, but showing degradation in full charge cap.
91 */
92 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
93 };
94
95 struct acpi_battery {
96 struct mutex lock;
97 struct mutex sysfs_lock;
98 struct power_supply *bat;
99 struct power_supply_desc bat_desc;
100 struct acpi_device *device;
101 struct notifier_block pm_nb;
102 struct list_head list;
103 unsigned long update_time;
104 int revision;
105 int rate_now;
106 int capacity_now;
107 int voltage_now;
108 int design_capacity;
109 int full_charge_capacity;
110 int technology;
111 int design_voltage;
112 int design_capacity_warning;
113 int design_capacity_low;
114 int cycle_count;
115 int measurement_accuracy;
116 int max_sampling_time;
117 int min_sampling_time;
118 int max_averaging_interval;
119 int min_averaging_interval;
120 int capacity_granularity_1;
121 int capacity_granularity_2;
122 int alarm;
123 char model_number[MAX_STRING_LENGTH];
124 char serial_number[MAX_STRING_LENGTH];
125 char type[MAX_STRING_LENGTH];
126 char oem_info[MAX_STRING_LENGTH];
127 int state;
128 int power_unit;
129 unsigned long flags;
130 };
131
132 #define to_acpi_battery(x) power_supply_get_drvdata(x)
133
acpi_battery_present(struct acpi_battery * battery)134 static inline int acpi_battery_present(struct acpi_battery *battery)
135 {
136 return battery->device->status.battery_present;
137 }
138
acpi_battery_technology(struct acpi_battery * battery)139 static int acpi_battery_technology(struct acpi_battery *battery)
140 {
141 if (!strcasecmp("NiCd", battery->type))
142 return POWER_SUPPLY_TECHNOLOGY_NiCd;
143 if (!strcasecmp("NiMH", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_NiMH;
145 if (!strcasecmp("LION", battery->type))
146 return POWER_SUPPLY_TECHNOLOGY_LION;
147 if (!strncasecmp("LI-ION", battery->type, 6))
148 return POWER_SUPPLY_TECHNOLOGY_LION;
149 if (!strcasecmp("LiP", battery->type))
150 return POWER_SUPPLY_TECHNOLOGY_LIPO;
151 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
152 }
153
154 static int acpi_battery_get_state(struct acpi_battery *battery);
155
acpi_battery_is_charged(struct acpi_battery * battery)156 static int acpi_battery_is_charged(struct acpi_battery *battery)
157 {
158 /* charging, discharging or critical low */
159 if (battery->state != 0)
160 return 0;
161
162 /* battery not reporting charge */
163 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
164 battery->capacity_now == 0)
165 return 0;
166
167 /* good batteries update full_charge as the batteries degrade */
168 if (battery->full_charge_capacity == battery->capacity_now)
169 return 1;
170
171 /* fallback to using design values for broken batteries */
172 if (battery->design_capacity <= battery->capacity_now)
173 return 1;
174
175 /* we don't do any sort of metric based on percentages */
176 return 0;
177 }
178
acpi_battery_is_degraded(struct acpi_battery * battery)179 static bool acpi_battery_is_degraded(struct acpi_battery *battery)
180 {
181 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
182 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
183 battery->full_charge_capacity < battery->design_capacity;
184 }
185
acpi_battery_handle_discharging(struct acpi_battery * battery)186 static int acpi_battery_handle_discharging(struct acpi_battery *battery)
187 {
188 /*
189 * Some devices wrongly report discharging if the battery's charge level
190 * was above the device's start charging threshold atm the AC adapter
191 * was plugged in and the device thus did not start a new charge cycle.
192 */
193 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
194 battery->rate_now == 0)
195 return POWER_SUPPLY_STATUS_NOT_CHARGING;
196
197 return POWER_SUPPLY_STATUS_DISCHARGING;
198 }
199
acpi_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)200 static int acpi_battery_get_property(struct power_supply *psy,
201 enum power_supply_property psp,
202 union power_supply_propval *val)
203 {
204 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
205 struct acpi_battery *battery = to_acpi_battery(psy);
206
207 if (acpi_battery_present(battery)) {
208 /* run battery update only if it is present */
209 acpi_battery_get_state(battery);
210 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
211 return -ENODEV;
212 switch (psp) {
213 case POWER_SUPPLY_PROP_STATUS:
214 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
215 val->intval = acpi_battery_handle_discharging(battery);
216 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
217 val->intval = POWER_SUPPLY_STATUS_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
311 static 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
329 static 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
343 static 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
361 static 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 */
376 struct acpi_offsets {
377 size_t offset; /* offset inside struct acpi_sbs_battery */
378 u8 mode; /* int or string? */
379 };
380
381 static 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
388 static 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
404 static 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
extract_package(struct acpi_battery * battery,union acpi_object * package,const struct acpi_offsets * offsets,int num)427 static 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
acpi_battery_get_status(struct acpi_battery * battery)470 static 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
extract_battery_info(const int use_bix,struct acpi_battery * battery,const struct acpi_buffer * buffer)481 static 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
acpi_battery_get_info(struct acpi_battery * battery)524 static 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
acpi_battery_get_state(struct acpi_battery * battery)565 static 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
acpi_battery_set_alarm(struct acpi_battery * battery)623 static 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
acpi_battery_init_alarm(struct acpi_battery * battery)645 static 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
acpi_battery_alarm_show(struct device * dev,struct device_attribute * attr,char * buf)658 static 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 sprintf(buf, "%d\n", battery->alarm * 1000);
665 }
666
acpi_battery_alarm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)667 static 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
681 static 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
687 static struct attribute *acpi_battery_attrs[] = {
688 &alarm_attr.attr,
689 NULL
690 };
691 ATTRIBUTE_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
702 static LIST_HEAD(acpi_battery_list);
703 static LIST_HEAD(battery_hook_list);
704 static DEFINE_MUTEX(hook_mutex);
705
battery_hook_unregister_unlocked(struct acpi_battery_hook * hook)706 static 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
battery_hook_unregister(struct acpi_battery_hook * hook)723 void 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 }
736 EXPORT_SYMBOL_GPL(battery_hook_unregister);
737
battery_hook_register(struct acpi_battery_hook * hook)738 void 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);
766 end:
767 mutex_unlock(&hook_mutex);
768 }
769 EXPORT_SYMBOL_GPL(battery_hook_register);
770
771 /*
772 * This function gets called right after the battery sysfs
773 * attributes have been added, so that the drivers that
774 * define custom sysfs attributes can add their own.
775 */
battery_hook_add_battery(struct acpi_battery * battery)776 static void battery_hook_add_battery(struct acpi_battery *battery)
777 {
778 struct acpi_battery_hook *hook_node, *tmp;
779
780 mutex_lock(&hook_mutex);
781 INIT_LIST_HEAD(&battery->list);
782 list_add(&battery->list, &acpi_battery_list);
783 /*
784 * Since we added a new battery to the list, we need to
785 * iterate over the hooks and call add_battery for each
786 * hook that was registered. This usually happens
787 * when a battery gets hotplugged or initialized
788 * during the battery module initialization.
789 */
790 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
791 if (hook_node->add_battery(battery->bat, hook_node)) {
792 /*
793 * The notification of the extensions has failed, to
794 * prevent further errors we will unload the extension.
795 */
796 pr_err("error in extension, unloading: %s",
797 hook_node->name);
798 battery_hook_unregister_unlocked(hook_node);
799 }
800 }
801 mutex_unlock(&hook_mutex);
802 }
803
battery_hook_remove_battery(struct acpi_battery * battery)804 static void battery_hook_remove_battery(struct acpi_battery *battery)
805 {
806 struct acpi_battery_hook *hook;
807
808 mutex_lock(&hook_mutex);
809 /*
810 * Before removing the hook, we need to remove all
811 * custom attributes from the battery.
812 */
813 list_for_each_entry(hook, &battery_hook_list, list) {
814 hook->remove_battery(battery->bat, hook);
815 }
816 /* Then, just remove the battery from the list */
817 list_del(&battery->list);
818 mutex_unlock(&hook_mutex);
819 }
820
battery_hook_exit(void)821 static void __exit battery_hook_exit(void)
822 {
823 struct acpi_battery_hook *hook;
824 struct acpi_battery_hook *ptr;
825 /*
826 * At this point, the acpi_bus_unregister_driver()
827 * has called remove for all batteries. We just
828 * need to remove the hooks.
829 */
830 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
831 battery_hook_unregister(hook);
832 }
833 mutex_destroy(&hook_mutex);
834 }
835
sysfs_add_battery(struct acpi_battery * battery)836 static int sysfs_add_battery(struct acpi_battery *battery)
837 {
838 struct power_supply_config psy_cfg = {
839 .drv_data = battery,
840 .attr_grp = acpi_battery_groups,
841 };
842 bool full_cap_broken = false;
843
844 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
845 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
846 full_cap_broken = true;
847
848 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
849 if (full_cap_broken) {
850 battery->bat_desc.properties =
851 charge_battery_full_cap_broken_props;
852 battery->bat_desc.num_properties =
853 ARRAY_SIZE(charge_battery_full_cap_broken_props);
854 } else {
855 battery->bat_desc.properties = charge_battery_props;
856 battery->bat_desc.num_properties =
857 ARRAY_SIZE(charge_battery_props);
858 }
859 } else {
860 if (full_cap_broken) {
861 battery->bat_desc.properties =
862 energy_battery_full_cap_broken_props;
863 battery->bat_desc.num_properties =
864 ARRAY_SIZE(energy_battery_full_cap_broken_props);
865 } else {
866 battery->bat_desc.properties = energy_battery_props;
867 battery->bat_desc.num_properties =
868 ARRAY_SIZE(energy_battery_props);
869 }
870 }
871
872 battery->bat_desc.name = acpi_device_bid(battery->device);
873 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
874 battery->bat_desc.get_property = acpi_battery_get_property;
875
876 battery->bat = power_supply_register_no_ws(&battery->device->dev,
877 &battery->bat_desc, &psy_cfg);
878
879 if (IS_ERR(battery->bat)) {
880 int result = PTR_ERR(battery->bat);
881
882 battery->bat = NULL;
883 return result;
884 }
885 battery_hook_add_battery(battery);
886 return 0;
887 }
888
sysfs_remove_battery(struct acpi_battery * battery)889 static void sysfs_remove_battery(struct acpi_battery *battery)
890 {
891 mutex_lock(&battery->sysfs_lock);
892 if (!battery->bat) {
893 mutex_unlock(&battery->sysfs_lock);
894 return;
895 }
896 battery_hook_remove_battery(battery);
897 power_supply_unregister(battery->bat);
898 battery->bat = NULL;
899 mutex_unlock(&battery->sysfs_lock);
900 }
901
find_battery(const struct dmi_header * dm,void * private)902 static void find_battery(const struct dmi_header *dm, void *private)
903 {
904 struct acpi_battery *battery = (struct acpi_battery *)private;
905 /* Note: the hardcoded offsets below have been extracted from
906 * the source code of dmidecode.
907 */
908 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
909 const u8 *dmi_data = (const u8 *)(dm + 1);
910 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
911
912 if (dm->length >= 18)
913 dmi_capacity *= dmi_data[17];
914 if (battery->design_capacity * battery->design_voltage / 1000
915 != dmi_capacity &&
916 battery->design_capacity * 10 == dmi_capacity)
917 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
918 &battery->flags);
919 }
920 }
921
922 /*
923 * According to the ACPI spec, some kinds of primary batteries can
924 * report percentage battery remaining capacity directly to OS.
925 * In this case, it reports the Last Full Charged Capacity == 100
926 * and BatteryPresentRate == 0xFFFFFFFF.
927 *
928 * Now we found some battery reports percentage remaining capacity
929 * even if it's rechargeable.
930 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
931 *
932 * Handle this correctly so that they won't break userspace.
933 */
acpi_battery_quirks(struct acpi_battery * battery)934 static void acpi_battery_quirks(struct acpi_battery *battery)
935 {
936 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
937 return;
938
939 if (battery->full_charge_capacity == 100 &&
940 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
941 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
942 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
943 battery->full_charge_capacity = battery->design_capacity;
944 battery->capacity_now = (battery->capacity_now *
945 battery->full_charge_capacity) / 100;
946 }
947
948 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
949 return;
950
951 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
952 const char *s;
953
954 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
955 if (s && !strncasecmp(s, "ThinkPad", 8)) {
956 dmi_walk(find_battery, battery);
957 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
958 &battery->flags) &&
959 battery->design_voltage) {
960 battery->design_capacity =
961 battery->design_capacity *
962 10000 / battery->design_voltage;
963 battery->full_charge_capacity =
964 battery->full_charge_capacity *
965 10000 / battery->design_voltage;
966 battery->design_capacity_warning =
967 battery->design_capacity_warning *
968 10000 / battery->design_voltage;
969 battery->capacity_now = battery->capacity_now *
970 10000 / battery->design_voltage;
971 }
972 }
973 }
974
975 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
976 return;
977
978 if (acpi_battery_is_degraded(battery) &&
979 battery->capacity_now > battery->full_charge_capacity) {
980 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
981 battery->capacity_now = battery->full_charge_capacity;
982 }
983 }
984
acpi_battery_update(struct acpi_battery * battery,bool resume)985 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
986 {
987 int result = acpi_battery_get_status(battery);
988
989 if (result)
990 return result;
991
992 if (!acpi_battery_present(battery)) {
993 sysfs_remove_battery(battery);
994 battery->update_time = 0;
995 return 0;
996 }
997
998 if (resume)
999 return 0;
1000
1001 if (!battery->update_time) {
1002 result = acpi_battery_get_info(battery);
1003 if (result)
1004 return result;
1005 acpi_battery_init_alarm(battery);
1006 }
1007
1008 result = acpi_battery_get_state(battery);
1009 if (result)
1010 return result;
1011 acpi_battery_quirks(battery);
1012
1013 if (!battery->bat) {
1014 result = sysfs_add_battery(battery);
1015 if (result)
1016 return result;
1017 }
1018
1019 /*
1020 * Wakeup the system if battery is critical low
1021 * or lower than the alarm level
1022 */
1023 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
1024 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1025 (battery->capacity_now <= battery->alarm)))
1026 acpi_pm_wakeup_event(&battery->device->dev);
1027
1028 return result;
1029 }
1030
acpi_battery_refresh(struct acpi_battery * battery)1031 static void acpi_battery_refresh(struct acpi_battery *battery)
1032 {
1033 int power_unit;
1034
1035 if (!battery->bat)
1036 return;
1037
1038 power_unit = battery->power_unit;
1039
1040 acpi_battery_get_info(battery);
1041
1042 if (power_unit == battery->power_unit)
1043 return;
1044
1045 /* The battery has changed its reporting units. */
1046 sysfs_remove_battery(battery);
1047 sysfs_add_battery(battery);
1048 }
1049
1050 /* Driver Interface */
acpi_battery_notify(acpi_handle handle,u32 event,void * data)1051 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
1052 {
1053 struct acpi_device *device = data;
1054 struct acpi_battery *battery = acpi_driver_data(device);
1055 struct power_supply *old;
1056
1057 if (!battery)
1058 return;
1059 old = battery->bat;
1060 /*
1061 * On Acer Aspire V5-573G notifications are sometimes triggered too
1062 * early. For example, when AC is unplugged and notification is
1063 * triggered, battery state is still reported as "Full", and changes to
1064 * "Discharging" only after short delay, without any notification.
1065 */
1066 if (battery_notification_delay_ms > 0)
1067 msleep(battery_notification_delay_ms);
1068 if (event == ACPI_BATTERY_NOTIFY_INFO)
1069 acpi_battery_refresh(battery);
1070 acpi_battery_update(battery, false);
1071 acpi_bus_generate_netlink_event(device->pnp.device_class,
1072 dev_name(&device->dev), event,
1073 acpi_battery_present(battery));
1074 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1075 /* acpi_battery_update could remove power_supply object */
1076 if (old && battery->bat)
1077 power_supply_changed(battery->bat);
1078 }
1079
battery_notify(struct notifier_block * nb,unsigned long mode,void * _unused)1080 static int battery_notify(struct notifier_block *nb,
1081 unsigned long mode, void *_unused)
1082 {
1083 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1084 pm_nb);
1085 int result;
1086
1087 switch (mode) {
1088 case PM_POST_HIBERNATION:
1089 case PM_POST_SUSPEND:
1090 if (!acpi_battery_present(battery))
1091 return 0;
1092
1093 if (battery->bat) {
1094 acpi_battery_refresh(battery);
1095 } else {
1096 result = acpi_battery_get_info(battery);
1097 if (result)
1098 return result;
1099
1100 result = sysfs_add_battery(battery);
1101 if (result)
1102 return result;
1103 }
1104
1105 acpi_battery_init_alarm(battery);
1106 acpi_battery_get_state(battery);
1107 break;
1108 }
1109
1110 return 0;
1111 }
1112
1113 static int __init
battery_bix_broken_package_quirk(const struct dmi_system_id * d)1114 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1115 {
1116 battery_bix_broken_package = 1;
1117 return 0;
1118 }
1119
1120 static int __init
battery_notification_delay_quirk(const struct dmi_system_id * d)1121 battery_notification_delay_quirk(const struct dmi_system_id *d)
1122 {
1123 battery_notification_delay_ms = 1000;
1124 return 0;
1125 }
1126
1127 static int __init
battery_ac_is_broken_quirk(const struct dmi_system_id * d)1128 battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1129 {
1130 battery_ac_is_broken = 1;
1131 return 0;
1132 }
1133
1134 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1135 {
1136 /* NEC LZ750/LS */
1137 .callback = battery_bix_broken_package_quirk,
1138 .matches = {
1139 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1140 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1141 },
1142 },
1143 {
1144 /* Acer Aspire V5-573G */
1145 .callback = battery_notification_delay_quirk,
1146 .matches = {
1147 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1148 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1149 },
1150 },
1151 {
1152 /* Point of View mobii wintab p800w */
1153 .callback = battery_ac_is_broken_quirk,
1154 .matches = {
1155 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1156 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1157 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1158 /* Above matches are too generic, add bios-date match */
1159 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1160 },
1161 },
1162 {
1163 /* Microsoft Surface Go 3 */
1164 .callback = battery_notification_delay_quirk,
1165 .matches = {
1166 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1167 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1168 },
1169 },
1170 {},
1171 };
1172
1173 /*
1174 * Some machines'(E,G Lenovo Z480) ECs are not stable
1175 * during boot up and this causes battery driver fails to be
1176 * probed due to failure of getting battery information
1177 * from EC sometimes. After several retries, the operation
1178 * may work. So add retry code here and 20ms sleep between
1179 * every retries.
1180 */
acpi_battery_update_retry(struct acpi_battery * battery)1181 static int acpi_battery_update_retry(struct acpi_battery *battery)
1182 {
1183 int retry, ret;
1184
1185 for (retry = 5; retry; retry--) {
1186 ret = acpi_battery_update(battery, false);
1187 if (!ret)
1188 break;
1189
1190 msleep(20);
1191 }
1192 return ret;
1193 }
1194
acpi_battery_add(struct acpi_device * device)1195 static int acpi_battery_add(struct acpi_device *device)
1196 {
1197 int result = 0;
1198 struct acpi_battery *battery = NULL;
1199
1200 if (!device)
1201 return -EINVAL;
1202
1203 if (device->dep_unmet)
1204 return -EPROBE_DEFER;
1205
1206 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1207 if (!battery)
1208 return -ENOMEM;
1209 battery->device = device;
1210 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1211 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1212 device->driver_data = battery;
1213 mutex_init(&battery->lock);
1214 mutex_init(&battery->sysfs_lock);
1215 if (acpi_has_method(battery->device->handle, "_BIX"))
1216 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1217
1218 result = acpi_battery_update_retry(battery);
1219 if (result)
1220 goto fail;
1221
1222 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1223 device->status.battery_present ? "present" : "absent");
1224
1225 battery->pm_nb.notifier_call = battery_notify;
1226 register_pm_notifier(&battery->pm_nb);
1227
1228 device_init_wakeup(&device->dev, 1);
1229
1230 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
1231 acpi_battery_notify);
1232 if (result)
1233 goto fail_pm;
1234
1235 return 0;
1236
1237 fail_pm:
1238 device_init_wakeup(&device->dev, 0);
1239 unregister_pm_notifier(&battery->pm_nb);
1240 fail:
1241 sysfs_remove_battery(battery);
1242 mutex_destroy(&battery->lock);
1243 mutex_destroy(&battery->sysfs_lock);
1244 kfree(battery);
1245
1246 return result;
1247 }
1248
acpi_battery_remove(struct acpi_device * device)1249 static void acpi_battery_remove(struct acpi_device *device)
1250 {
1251 struct acpi_battery *battery = NULL;
1252
1253 if (!device || !acpi_driver_data(device))
1254 return;
1255
1256 battery = acpi_driver_data(device);
1257
1258 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY,
1259 acpi_battery_notify);
1260
1261 device_init_wakeup(&device->dev, 0);
1262 unregister_pm_notifier(&battery->pm_nb);
1263 sysfs_remove_battery(battery);
1264
1265 mutex_destroy(&battery->lock);
1266 mutex_destroy(&battery->sysfs_lock);
1267 kfree(battery);
1268 }
1269
1270 #ifdef CONFIG_PM_SLEEP
1271 /* this is needed to learn about changes made in suspended state */
acpi_battery_resume(struct device * dev)1272 static int acpi_battery_resume(struct device *dev)
1273 {
1274 struct acpi_battery *battery;
1275
1276 if (!dev)
1277 return -EINVAL;
1278
1279 battery = acpi_driver_data(to_acpi_device(dev));
1280 if (!battery)
1281 return -EINVAL;
1282
1283 battery->update_time = 0;
1284 acpi_battery_update(battery, true);
1285 return 0;
1286 }
1287 #else
1288 #define acpi_battery_resume NULL
1289 #endif
1290
1291 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1292
1293 static struct acpi_driver acpi_battery_driver = {
1294 .name = "battery",
1295 .class = ACPI_BATTERY_CLASS,
1296 .ids = battery_device_ids,
1297 .ops = {
1298 .add = acpi_battery_add,
1299 .remove = acpi_battery_remove,
1300 },
1301 .drv.pm = &acpi_battery_pm,
1302 };
1303
acpi_battery_init_async(void * unused,async_cookie_t cookie)1304 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1305 {
1306 int result;
1307
1308 if (acpi_quirk_skip_acpi_ac_and_battery())
1309 return;
1310
1311 dmi_check_system(bat_dmi_table);
1312
1313 result = acpi_bus_register_driver(&acpi_battery_driver);
1314 battery_driver_registered = (result == 0);
1315 }
1316
acpi_battery_init(void)1317 static int __init acpi_battery_init(void)
1318 {
1319 if (acpi_disabled)
1320 return -ENODEV;
1321
1322 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1323 return 0;
1324 }
1325
acpi_battery_exit(void)1326 static void __exit acpi_battery_exit(void)
1327 {
1328 async_synchronize_cookie(async_cookie + 1);
1329 if (battery_driver_registered) {
1330 acpi_bus_unregister_driver(&acpi_battery_driver);
1331 battery_hook_exit();
1332 }
1333 }
1334
1335 module_init(acpi_battery_init);
1336 module_exit(acpi_battery_exit);
1337