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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/*
2 * battery.c - ACPI Battery Driver (Revision: 2.0)
3 *
4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
22 */
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/jiffies.h>
29#include <linux/async.h>
30#include <linux/dmi.h>
31#include <linux/delay.h>
32#include <linux/slab.h>
33#include <linux/suspend.h>
34#include <asm/unaligned.h>
35
36#ifdef CONFIG_ACPI_PROCFS_POWER
37#include <linux/proc_fs.h>
38#include <linux/seq_file.h>
39#include <asm/uaccess.h>
40#endif
41
42#include <linux/acpi.h>
43#include <linux/power_supply.h>
44
45#include "battery.h"
46
47#define PREFIX "ACPI: "
48
49#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
50
51#define ACPI_BATTERY_DEVICE_NAME "Battery"
52
53/* Battery power unit: 0 means mW, 1 means mA */
54#define ACPI_BATTERY_POWER_UNIT_MA 1
55
56#define ACPI_BATTERY_STATE_DISCHARGING 0x1
57#define ACPI_BATTERY_STATE_CHARGING 0x2
58#define ACPI_BATTERY_STATE_CRITICAL 0x4
59
60#define _COMPONENT ACPI_BATTERY_COMPONENT
61
62ACPI_MODULE_NAME("battery");
63
64MODULE_AUTHOR("Paul Diefenbaugh");
65MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
66MODULE_DESCRIPTION("ACPI Battery Driver");
67MODULE_LICENSE("GPL");
68
69static async_cookie_t async_cookie;
70static int battery_bix_broken_package;
71static int battery_notification_delay_ms;
72static unsigned int cache_time = 1000;
73module_param(cache_time, uint, 0644);
74MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
75
76#ifdef CONFIG_ACPI_PROCFS_POWER
77extern struct proc_dir_entry *acpi_lock_battery_dir(void);
78extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
79
80enum acpi_battery_files {
81 info_tag = 0,
82 state_tag,
83 alarm_tag,
84 ACPI_BATTERY_NUMFILES,
85};
86
87#endif
88
89static const struct acpi_device_id battery_device_ids[] = {
90 {"PNP0C0A", 0},
91 {"", 0},
92};
93
94MODULE_DEVICE_TABLE(acpi, battery_device_ids);
95
96enum {
97 ACPI_BATTERY_ALARM_PRESENT,
98 ACPI_BATTERY_XINFO_PRESENT,
99 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
100 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
101 switches between mWh and mAh depending on whether the system
102 is running on battery or not. When mAh is the unit, most
103 reported values are incorrect and need to be adjusted by
104 10000/design_voltage. Verified on x201, t410, t410s, and x220.
105 Pre-2010 and 2012 models appear to always report in mWh and
106 are thus unaffected (tested with t42, t61, t500, x200, x300,
107 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
108 the 2011 models that fixes the issue (tested on x220 with a
109 post-1.29 BIOS), but as of Nov. 2012, no such update is
110 available for the 2010 models. */
111 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
112};
113
114struct acpi_battery {
115 struct mutex lock;
116 struct mutex sysfs_lock;
117 struct power_supply *bat;
118 struct power_supply_desc bat_desc;
119 struct acpi_device *device;
120 struct notifier_block pm_nb;
121 unsigned long update_time;
122 int revision;
123 int rate_now;
124 int capacity_now;
125 int voltage_now;
126 int design_capacity;
127 int full_charge_capacity;
128 int technology;
129 int design_voltage;
130 int design_capacity_warning;
131 int design_capacity_low;
132 int cycle_count;
133 int measurement_accuracy;
134 int max_sampling_time;
135 int min_sampling_time;
136 int max_averaging_interval;
137 int min_averaging_interval;
138 int capacity_granularity_1;
139 int capacity_granularity_2;
140 int alarm;
141 char model_number[32];
142 char serial_number[32];
143 char type[32];
144 char oem_info[32];
145 int state;
146 int power_unit;
147 unsigned long flags;
148};
149
150#define to_acpi_battery(x) power_supply_get_drvdata(x)
151
152static inline int acpi_battery_present(struct acpi_battery *battery)
153{
154 return battery->device->status.battery_present;
155}
156
157static int acpi_battery_technology(struct acpi_battery *battery)
158{
159 if (!strcasecmp("NiCd", battery->type))
160 return POWER_SUPPLY_TECHNOLOGY_NiCd;
161 if (!strcasecmp("NiMH", battery->type))
162 return POWER_SUPPLY_TECHNOLOGY_NiMH;
163 if (!strcasecmp("LION", battery->type))
164 return POWER_SUPPLY_TECHNOLOGY_LION;
165 if (!strncasecmp("LI-ION", battery->type, 6))
166 return POWER_SUPPLY_TECHNOLOGY_LION;
167 if (!strcasecmp("LiP", battery->type))
168 return POWER_SUPPLY_TECHNOLOGY_LIPO;
169 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
170}
171
172static int acpi_battery_get_state(struct acpi_battery *battery);
173
174static int acpi_battery_is_charged(struct acpi_battery *battery)
175{
176 /* charging, discharging or critical low */
177 if (battery->state != 0)
178 return 0;
179
180 /* battery not reporting charge */
181 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
182 battery->capacity_now == 0)
183 return 0;
184
185 /* good batteries update full_charge as the batteries degrade */
186 if (battery->full_charge_capacity == battery->capacity_now)
187 return 1;
188
189 /* fallback to using design values for broken batteries */
190 if (battery->design_capacity == battery->capacity_now)
191 return 1;
192
193 /* we don't do any sort of metric based on percentages */
194 return 0;
195}
196
197static int acpi_battery_get_property(struct power_supply *psy,
198 enum power_supply_property psp,
199 union power_supply_propval *val)
200{
201 int ret = 0;
202 struct acpi_battery *battery = to_acpi_battery(psy);
203
204 if (acpi_battery_present(battery)) {
205 /* run battery update only if it is present */
206 acpi_battery_get_state(battery);
207 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
208 return -ENODEV;
209 switch (psp) {
210 case POWER_SUPPLY_PROP_STATUS:
211 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
212 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
213 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
214 val->intval = POWER_SUPPLY_STATUS_CHARGING;
215 else if (acpi_battery_is_charged(battery))
216 val->intval = POWER_SUPPLY_STATUS_FULL;
217 else
218 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
219 break;
220 case POWER_SUPPLY_PROP_PRESENT:
221 val->intval = acpi_battery_present(battery);
222 break;
223 case POWER_SUPPLY_PROP_TECHNOLOGY:
224 val->intval = acpi_battery_technology(battery);
225 break;
226 case POWER_SUPPLY_PROP_CYCLE_COUNT:
227 val->intval = battery->cycle_count;
228 break;
229 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
230 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
231 ret = -ENODEV;
232 else
233 val->intval = battery->design_voltage * 1000;
234 break;
235 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
236 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
237 ret = -ENODEV;
238 else
239 val->intval = battery->voltage_now * 1000;
240 break;
241 case POWER_SUPPLY_PROP_CURRENT_NOW:
242 case POWER_SUPPLY_PROP_POWER_NOW:
243 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
244 ret = -ENODEV;
245 else
246 val->intval = battery->rate_now * 1000;
247 break;
248 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
249 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
250 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
251 ret = -ENODEV;
252 else
253 val->intval = battery->design_capacity * 1000;
254 break;
255 case POWER_SUPPLY_PROP_CHARGE_FULL:
256 case POWER_SUPPLY_PROP_ENERGY_FULL:
257 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
258 ret = -ENODEV;
259 else
260 val->intval = battery->full_charge_capacity * 1000;
261 break;
262 case POWER_SUPPLY_PROP_CHARGE_NOW:
263 case POWER_SUPPLY_PROP_ENERGY_NOW:
264 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
265 ret = -ENODEV;
266 else
267 val->intval = battery->capacity_now * 1000;
268 break;
269 case POWER_SUPPLY_PROP_CAPACITY:
270 if (battery->capacity_now && battery->full_charge_capacity)
271 val->intval = battery->capacity_now * 100/
272 battery->full_charge_capacity;
273 else
274 val->intval = 0;
275 break;
276 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
277 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
278 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
279 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
280 (battery->capacity_now <= battery->alarm))
281 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
282 else if (acpi_battery_is_charged(battery))
283 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
284 else
285 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
286 break;
287 case POWER_SUPPLY_PROP_MODEL_NAME:
288 val->strval = battery->model_number;
289 break;
290 case POWER_SUPPLY_PROP_MANUFACTURER:
291 val->strval = battery->oem_info;
292 break;
293 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
294 val->strval = battery->serial_number;
295 break;
296 default:
297 ret = -EINVAL;
298 }
299 return ret;
300}
301
302static enum power_supply_property charge_battery_props[] = {
303 POWER_SUPPLY_PROP_STATUS,
304 POWER_SUPPLY_PROP_PRESENT,
305 POWER_SUPPLY_PROP_TECHNOLOGY,
306 POWER_SUPPLY_PROP_CYCLE_COUNT,
307 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
308 POWER_SUPPLY_PROP_VOLTAGE_NOW,
309 POWER_SUPPLY_PROP_CURRENT_NOW,
310 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
311 POWER_SUPPLY_PROP_CHARGE_FULL,
312 POWER_SUPPLY_PROP_CHARGE_NOW,
313 POWER_SUPPLY_PROP_CAPACITY,
314 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
315 POWER_SUPPLY_PROP_MODEL_NAME,
316 POWER_SUPPLY_PROP_MANUFACTURER,
317 POWER_SUPPLY_PROP_SERIAL_NUMBER,
318};
319
320static enum power_supply_property energy_battery_props[] = {
321 POWER_SUPPLY_PROP_STATUS,
322 POWER_SUPPLY_PROP_PRESENT,
323 POWER_SUPPLY_PROP_TECHNOLOGY,
324 POWER_SUPPLY_PROP_CYCLE_COUNT,
325 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
326 POWER_SUPPLY_PROP_VOLTAGE_NOW,
327 POWER_SUPPLY_PROP_POWER_NOW,
328 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
329 POWER_SUPPLY_PROP_ENERGY_FULL,
330 POWER_SUPPLY_PROP_ENERGY_NOW,
331 POWER_SUPPLY_PROP_CAPACITY,
332 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
333 POWER_SUPPLY_PROP_MODEL_NAME,
334 POWER_SUPPLY_PROP_MANUFACTURER,
335 POWER_SUPPLY_PROP_SERIAL_NUMBER,
336};
337
338/* --------------------------------------------------------------------------
339 Battery Management
340 -------------------------------------------------------------------------- */
341struct acpi_offsets {
342 size_t offset; /* offset inside struct acpi_sbs_battery */
343 u8 mode; /* int or string? */
344};
345
346static const struct acpi_offsets state_offsets[] = {
347 {offsetof(struct acpi_battery, state), 0},
348 {offsetof(struct acpi_battery, rate_now), 0},
349 {offsetof(struct acpi_battery, capacity_now), 0},
350 {offsetof(struct acpi_battery, voltage_now), 0},
351};
352
353static const struct acpi_offsets info_offsets[] = {
354 {offsetof(struct acpi_battery, power_unit), 0},
355 {offsetof(struct acpi_battery, design_capacity), 0},
356 {offsetof(struct acpi_battery, full_charge_capacity), 0},
357 {offsetof(struct acpi_battery, technology), 0},
358 {offsetof(struct acpi_battery, design_voltage), 0},
359 {offsetof(struct acpi_battery, design_capacity_warning), 0},
360 {offsetof(struct acpi_battery, design_capacity_low), 0},
361 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
362 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
363 {offsetof(struct acpi_battery, model_number), 1},
364 {offsetof(struct acpi_battery, serial_number), 1},
365 {offsetof(struct acpi_battery, type), 1},
366 {offsetof(struct acpi_battery, oem_info), 1},
367};
368
369static const struct acpi_offsets extended_info_offsets[] = {
370 {offsetof(struct acpi_battery, revision), 0},
371 {offsetof(struct acpi_battery, power_unit), 0},
372 {offsetof(struct acpi_battery, design_capacity), 0},
373 {offsetof(struct acpi_battery, full_charge_capacity), 0},
374 {offsetof(struct acpi_battery, technology), 0},
375 {offsetof(struct acpi_battery, design_voltage), 0},
376 {offsetof(struct acpi_battery, design_capacity_warning), 0},
377 {offsetof(struct acpi_battery, design_capacity_low), 0},
378 {offsetof(struct acpi_battery, cycle_count), 0},
379 {offsetof(struct acpi_battery, measurement_accuracy), 0},
380 {offsetof(struct acpi_battery, max_sampling_time), 0},
381 {offsetof(struct acpi_battery, min_sampling_time), 0},
382 {offsetof(struct acpi_battery, max_averaging_interval), 0},
383 {offsetof(struct acpi_battery, min_averaging_interval), 0},
384 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
385 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
386 {offsetof(struct acpi_battery, model_number), 1},
387 {offsetof(struct acpi_battery, serial_number), 1},
388 {offsetof(struct acpi_battery, type), 1},
389 {offsetof(struct acpi_battery, oem_info), 1},
390};
391
392static int extract_package(struct acpi_battery *battery,
393 union acpi_object *package,
394 const struct acpi_offsets *offsets, int num)
395{
396 int i;
397 union acpi_object *element;
398 if (package->type != ACPI_TYPE_PACKAGE)
399 return -EFAULT;
400 for (i = 0; i < num; ++i) {
401 if (package->package.count <= i)
402 return -EFAULT;
403 element = &package->package.elements[i];
404 if (offsets[i].mode) {
405 u8 *ptr = (u8 *)battery + offsets[i].offset;
406 if (element->type == ACPI_TYPE_STRING ||
407 element->type == ACPI_TYPE_BUFFER)
408 strncpy(ptr, element->string.pointer, 32);
409 else if (element->type == ACPI_TYPE_INTEGER) {
410 strncpy(ptr, (u8 *)&element->integer.value,
411 sizeof(u64));
412 ptr[sizeof(u64)] = 0;
413 } else
414 *ptr = 0; /* don't have value */
415 } else {
416 int *x = (int *)((u8 *)battery + offsets[i].offset);
417 *x = (element->type == ACPI_TYPE_INTEGER) ?
418 element->integer.value : -1;
419 }
420 }
421 return 0;
422}
423
424static int acpi_battery_get_status(struct acpi_battery *battery)
425{
426 if (acpi_bus_get_status(battery->device)) {
427 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
428 return -ENODEV;
429 }
430 return 0;
431}
432
433static int acpi_battery_get_info(struct acpi_battery *battery)
434{
435 int result = -EFAULT;
436 acpi_status status = 0;
437 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags) ?
438 "_BIX" : "_BIF";
439
440 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
441
442 if (!acpi_battery_present(battery))
443 return 0;
444 mutex_lock(&battery->lock);
445 status = acpi_evaluate_object(battery->device->handle, name,
446 NULL, &buffer);
447 mutex_unlock(&battery->lock);
448
449 if (ACPI_FAILURE(status)) {
450 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
451 return -ENODEV;
452 }
453
454 if (battery_bix_broken_package)
455 result = extract_package(battery, buffer.pointer,
456 extended_info_offsets + 1,
457 ARRAY_SIZE(extended_info_offsets) - 1);
458 else if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
459 result = extract_package(battery, buffer.pointer,
460 extended_info_offsets,
461 ARRAY_SIZE(extended_info_offsets));
462 else
463 result = extract_package(battery, buffer.pointer,
464 info_offsets, ARRAY_SIZE(info_offsets));
465 kfree(buffer.pointer);
466 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
467 battery->full_charge_capacity = battery->design_capacity;
468 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
469 battery->power_unit && battery->design_voltage) {
470 battery->design_capacity = battery->design_capacity *
471 10000 / battery->design_voltage;
472 battery->full_charge_capacity = battery->full_charge_capacity *
473 10000 / battery->design_voltage;
474 battery->design_capacity_warning =
475 battery->design_capacity_warning *
476 10000 / battery->design_voltage;
477 /* Curiously, design_capacity_low, unlike the rest of them,
478 is correct. */
479 /* capacity_granularity_* equal 1 on the systems tested, so
480 it's impossible to tell if they would need an adjustment
481 or not if their values were higher. */
482 }
483 return result;
484}
485
486static int acpi_battery_get_state(struct acpi_battery *battery)
487{
488 int result = 0;
489 acpi_status status = 0;
490 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
491
492 if (!acpi_battery_present(battery))
493 return 0;
494
495 if (battery->update_time &&
496 time_before(jiffies, battery->update_time +
497 msecs_to_jiffies(cache_time)))
498 return 0;
499
500 mutex_lock(&battery->lock);
501 status = acpi_evaluate_object(battery->device->handle, "_BST",
502 NULL, &buffer);
503 mutex_unlock(&battery->lock);
504
505 if (ACPI_FAILURE(status)) {
506 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
507 return -ENODEV;
508 }
509
510 result = extract_package(battery, buffer.pointer,
511 state_offsets, ARRAY_SIZE(state_offsets));
512 battery->update_time = jiffies;
513 kfree(buffer.pointer);
514
515 /* For buggy DSDTs that report negative 16-bit values for either
516 * charging or discharging current and/or report 0 as 65536
517 * due to bad math.
518 */
519 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
520 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
521 (s16)(battery->rate_now) < 0) {
522 battery->rate_now = abs((s16)battery->rate_now);
523 printk_once(KERN_WARNING FW_BUG
524 "battery: (dis)charge rate invalid.\n");
525 }
526
527 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
528 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
529 battery->capacity_now = (battery->capacity_now *
530 battery->full_charge_capacity) / 100;
531 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
532 battery->power_unit && battery->design_voltage) {
533 battery->capacity_now = battery->capacity_now *
534 10000 / battery->design_voltage;
535 }
536 return result;
537}
538
539static int acpi_battery_set_alarm(struct acpi_battery *battery)
540{
541 acpi_status status = 0;
542
543 if (!acpi_battery_present(battery) ||
544 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
545 return -ENODEV;
546
547 mutex_lock(&battery->lock);
548 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
549 battery->alarm);
550 mutex_unlock(&battery->lock);
551
552 if (ACPI_FAILURE(status))
553 return -ENODEV;
554
555 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
556 return 0;
557}
558
559static int acpi_battery_init_alarm(struct acpi_battery *battery)
560{
561 /* See if alarms are supported, and if so, set default */
562 if (!acpi_has_method(battery->device->handle, "_BTP")) {
563 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
564 return 0;
565 }
566 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
567 if (!battery->alarm)
568 battery->alarm = battery->design_capacity_warning;
569 return acpi_battery_set_alarm(battery);
570}
571
572static ssize_t acpi_battery_alarm_show(struct device *dev,
573 struct device_attribute *attr,
574 char *buf)
575{
576 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
577 return sprintf(buf, "%d\n", battery->alarm * 1000);
578}
579
580static ssize_t acpi_battery_alarm_store(struct device *dev,
581 struct device_attribute *attr,
582 const char *buf, size_t count)
583{
584 unsigned long x;
585 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
586 if (sscanf(buf, "%lu\n", &x) == 1)
587 battery->alarm = x/1000;
588 if (acpi_battery_present(battery))
589 acpi_battery_set_alarm(battery);
590 return count;
591}
592
593static struct device_attribute alarm_attr = {
594 .attr = {.name = "alarm", .mode = 0644},
595 .show = acpi_battery_alarm_show,
596 .store = acpi_battery_alarm_store,
597};
598
599static int sysfs_add_battery(struct acpi_battery *battery)
600{
601 struct power_supply_config psy_cfg = { .drv_data = battery, };
602
603 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
604 battery->bat_desc.properties = charge_battery_props;
605 battery->bat_desc.num_properties =
606 ARRAY_SIZE(charge_battery_props);
607 } else {
608 battery->bat_desc.properties = energy_battery_props;
609 battery->bat_desc.num_properties =
610 ARRAY_SIZE(energy_battery_props);
611 }
612
613 battery->bat_desc.name = acpi_device_bid(battery->device);
614 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
615 battery->bat_desc.get_property = acpi_battery_get_property;
616
617 battery->bat = power_supply_register_no_ws(&battery->device->dev,
618 &battery->bat_desc, &psy_cfg);
619
620 if (IS_ERR(battery->bat)) {
621 int result = PTR_ERR(battery->bat);
622
623 battery->bat = NULL;
624 return result;
625 }
626 return device_create_file(&battery->bat->dev, &alarm_attr);
627}
628
629static void sysfs_remove_battery(struct acpi_battery *battery)
630{
631 mutex_lock(&battery->sysfs_lock);
632 if (!battery->bat) {
633 mutex_unlock(&battery->sysfs_lock);
634 return;
635 }
636
637 device_remove_file(&battery->bat->dev, &alarm_attr);
638 power_supply_unregister(battery->bat);
639 battery->bat = NULL;
640 mutex_unlock(&battery->sysfs_lock);
641}
642
643static void find_battery(const struct dmi_header *dm, void *private)
644{
645 struct acpi_battery *battery = (struct acpi_battery *)private;
646 /* Note: the hardcoded offsets below have been extracted from
647 the source code of dmidecode. */
648 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
649 const u8 *dmi_data = (const u8 *)(dm + 1);
650 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
651 if (dm->length >= 18)
652 dmi_capacity *= dmi_data[17];
653 if (battery->design_capacity * battery->design_voltage / 1000
654 != dmi_capacity &&
655 battery->design_capacity * 10 == dmi_capacity)
656 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
657 &battery->flags);
658 }
659}
660
661/*
662 * According to the ACPI spec, some kinds of primary batteries can
663 * report percentage battery remaining capacity directly to OS.
664 * In this case, it reports the Last Full Charged Capacity == 100
665 * and BatteryPresentRate == 0xFFFFFFFF.
666 *
667 * Now we found some battery reports percentage remaining capacity
668 * even if it's rechargeable.
669 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
670 *
671 * Handle this correctly so that they won't break userspace.
672 */
673static void acpi_battery_quirks(struct acpi_battery *battery)
674{
675 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
676 return;
677
678 if (battery->full_charge_capacity == 100 &&
679 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
680 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
681 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
682 battery->full_charge_capacity = battery->design_capacity;
683 battery->capacity_now = (battery->capacity_now *
684 battery->full_charge_capacity) / 100;
685 }
686
687 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
688 return;
689
690 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
691 const char *s;
692 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
693 if (s && !strncasecmp(s, "ThinkPad", 8)) {
694 dmi_walk(find_battery, battery);
695 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
696 &battery->flags) &&
697 battery->design_voltage) {
698 battery->design_capacity =
699 battery->design_capacity *
700 10000 / battery->design_voltage;
701 battery->full_charge_capacity =
702 battery->full_charge_capacity *
703 10000 / battery->design_voltage;
704 battery->design_capacity_warning =
705 battery->design_capacity_warning *
706 10000 / battery->design_voltage;
707 battery->capacity_now = battery->capacity_now *
708 10000 / battery->design_voltage;
709 }
710 }
711 }
712}
713
714static int acpi_battery_update(struct acpi_battery *battery, bool resume)
715{
716 int result, old_present = acpi_battery_present(battery);
717 result = acpi_battery_get_status(battery);
718 if (result)
719 return result;
720 if (!acpi_battery_present(battery)) {
721 sysfs_remove_battery(battery);
722 battery->update_time = 0;
723 return 0;
724 }
725
726 if (resume)
727 return 0;
728
729 if (!battery->update_time ||
730 old_present != acpi_battery_present(battery)) {
731 result = acpi_battery_get_info(battery);
732 if (result)
733 return result;
734 acpi_battery_init_alarm(battery);
735 }
736 if (!battery->bat) {
737 result = sysfs_add_battery(battery);
738 if (result)
739 return result;
740 }
741 result = acpi_battery_get_state(battery);
742 if (result)
743 return result;
744 acpi_battery_quirks(battery);
745
746 /*
747 * Wakeup the system if battery is critical low
748 * or lower than the alarm level
749 */
750 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
751 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
752 (battery->capacity_now <= battery->alarm)))
753 pm_wakeup_event(&battery->device->dev, 0);
754
755 return result;
756}
757
758static void acpi_battery_refresh(struct acpi_battery *battery)
759{
760 int power_unit;
761
762 if (!battery->bat)
763 return;
764
765 power_unit = battery->power_unit;
766
767 acpi_battery_get_info(battery);
768
769 if (power_unit == battery->power_unit)
770 return;
771
772 /* The battery has changed its reporting units. */
773 sysfs_remove_battery(battery);
774 sysfs_add_battery(battery);
775}
776
777/* --------------------------------------------------------------------------
778 FS Interface (/proc)
779 -------------------------------------------------------------------------- */
780
781#ifdef CONFIG_ACPI_PROCFS_POWER
782static struct proc_dir_entry *acpi_battery_dir;
783
784static const char *acpi_battery_units(const struct acpi_battery *battery)
785{
786 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
787 "mA" : "mW";
788}
789
790static int acpi_battery_print_info(struct seq_file *seq, int result)
791{
792 struct acpi_battery *battery = seq->private;
793
794 if (result)
795 goto end;
796
797 seq_printf(seq, "present: %s\n",
798 acpi_battery_present(battery) ? "yes" : "no");
799 if (!acpi_battery_present(battery))
800 goto end;
801 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
802 seq_printf(seq, "design capacity: unknown\n");
803 else
804 seq_printf(seq, "design capacity: %d %sh\n",
805 battery->design_capacity,
806 acpi_battery_units(battery));
807
808 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
809 seq_printf(seq, "last full capacity: unknown\n");
810 else
811 seq_printf(seq, "last full capacity: %d %sh\n",
812 battery->full_charge_capacity,
813 acpi_battery_units(battery));
814
815 seq_printf(seq, "battery technology: %srechargeable\n",
816 (!battery->technology)?"non-":"");
817
818 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
819 seq_printf(seq, "design voltage: unknown\n");
820 else
821 seq_printf(seq, "design voltage: %d mV\n",
822 battery->design_voltage);
823 seq_printf(seq, "design capacity warning: %d %sh\n",
824 battery->design_capacity_warning,
825 acpi_battery_units(battery));
826 seq_printf(seq, "design capacity low: %d %sh\n",
827 battery->design_capacity_low,
828 acpi_battery_units(battery));
829 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
830 seq_printf(seq, "capacity granularity 1: %d %sh\n",
831 battery->capacity_granularity_1,
832 acpi_battery_units(battery));
833 seq_printf(seq, "capacity granularity 2: %d %sh\n",
834 battery->capacity_granularity_2,
835 acpi_battery_units(battery));
836 seq_printf(seq, "model number: %s\n", battery->model_number);
837 seq_printf(seq, "serial number: %s\n", battery->serial_number);
838 seq_printf(seq, "battery type: %s\n", battery->type);
839 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
840 end:
841 if (result)
842 seq_printf(seq, "ERROR: Unable to read battery info\n");
843 return result;
844}
845
846static int acpi_battery_print_state(struct seq_file *seq, int result)
847{
848 struct acpi_battery *battery = seq->private;
849
850 if (result)
851 goto end;
852
853 seq_printf(seq, "present: %s\n",
854 acpi_battery_present(battery) ? "yes" : "no");
855 if (!acpi_battery_present(battery))
856 goto end;
857
858 seq_printf(seq, "capacity state: %s\n",
859 (battery->state & 0x04) ? "critical" : "ok");
860 if ((battery->state & 0x01) && (battery->state & 0x02))
861 seq_printf(seq,
862 "charging state: charging/discharging\n");
863 else if (battery->state & 0x01)
864 seq_printf(seq, "charging state: discharging\n");
865 else if (battery->state & 0x02)
866 seq_printf(seq, "charging state: charging\n");
867 else
868 seq_printf(seq, "charging state: charged\n");
869
870 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
871 seq_printf(seq, "present rate: unknown\n");
872 else
873 seq_printf(seq, "present rate: %d %s\n",
874 battery->rate_now, acpi_battery_units(battery));
875
876 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
877 seq_printf(seq, "remaining capacity: unknown\n");
878 else
879 seq_printf(seq, "remaining capacity: %d %sh\n",
880 battery->capacity_now, acpi_battery_units(battery));
881 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
882 seq_printf(seq, "present voltage: unknown\n");
883 else
884 seq_printf(seq, "present voltage: %d mV\n",
885 battery->voltage_now);
886 end:
887 if (result)
888 seq_printf(seq, "ERROR: Unable to read battery state\n");
889
890 return result;
891}
892
893static int acpi_battery_print_alarm(struct seq_file *seq, int result)
894{
895 struct acpi_battery *battery = seq->private;
896
897 if (result)
898 goto end;
899
900 if (!acpi_battery_present(battery)) {
901 seq_printf(seq, "present: no\n");
902 goto end;
903 }
904 seq_printf(seq, "alarm: ");
905 if (!battery->alarm)
906 seq_printf(seq, "unsupported\n");
907 else
908 seq_printf(seq, "%u %sh\n", battery->alarm,
909 acpi_battery_units(battery));
910 end:
911 if (result)
912 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
913 return result;
914}
915
916static ssize_t acpi_battery_write_alarm(struct file *file,
917 const char __user * buffer,
918 size_t count, loff_t * ppos)
919{
920 int result = 0;
921 char alarm_string[12] = { '\0' };
922 struct seq_file *m = file->private_data;
923 struct acpi_battery *battery = m->private;
924
925 if (!battery || (count > sizeof(alarm_string) - 1))
926 return -EINVAL;
927 if (!acpi_battery_present(battery)) {
928 result = -ENODEV;
929 goto end;
930 }
931 if (copy_from_user(alarm_string, buffer, count)) {
932 result = -EFAULT;
933 goto end;
934 }
935 alarm_string[count] = '\0';
936 if (kstrtoint(alarm_string, 0, &battery->alarm)) {
937 result = -EINVAL;
938 goto end;
939 }
940 result = acpi_battery_set_alarm(battery);
941 end:
942 if (!result)
943 return count;
944 return result;
945}
946
947typedef int(*print_func)(struct seq_file *seq, int result);
948
949static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
950 acpi_battery_print_info,
951 acpi_battery_print_state,
952 acpi_battery_print_alarm,
953};
954
955static int acpi_battery_read(int fid, struct seq_file *seq)
956{
957 struct acpi_battery *battery = seq->private;
958 int result = acpi_battery_update(battery, false);
959 return acpi_print_funcs[fid](seq, result);
960}
961
962#define DECLARE_FILE_FUNCTIONS(_name) \
963static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
964{ \
965 return acpi_battery_read(_name##_tag, seq); \
966} \
967static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
968{ \
969 return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
970}
971
972DECLARE_FILE_FUNCTIONS(info);
973DECLARE_FILE_FUNCTIONS(state);
974DECLARE_FILE_FUNCTIONS(alarm);
975
976#undef DECLARE_FILE_FUNCTIONS
977
978#define FILE_DESCRIPTION_RO(_name) \
979 { \
980 .name = __stringify(_name), \
981 .mode = S_IRUGO, \
982 .ops = { \
983 .open = acpi_battery_##_name##_open_fs, \
984 .read = seq_read, \
985 .llseek = seq_lseek, \
986 .release = single_release, \
987 .owner = THIS_MODULE, \
988 }, \
989 }
990
991#define FILE_DESCRIPTION_RW(_name) \
992 { \
993 .name = __stringify(_name), \
994 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
995 .ops = { \
996 .open = acpi_battery_##_name##_open_fs, \
997 .read = seq_read, \
998 .llseek = seq_lseek, \
999 .write = acpi_battery_write_##_name, \
1000 .release = single_release, \
1001 .owner = THIS_MODULE, \
1002 }, \
1003 }
1004
1005static const struct battery_file {
1006 struct file_operations ops;
1007 umode_t mode;
1008 const char *name;
1009} acpi_battery_file[] = {
1010 FILE_DESCRIPTION_RO(info),
1011 FILE_DESCRIPTION_RO(state),
1012 FILE_DESCRIPTION_RW(alarm),
1013};
1014
1015#undef FILE_DESCRIPTION_RO
1016#undef FILE_DESCRIPTION_RW
1017
1018static int acpi_battery_add_fs(struct acpi_device *device)
1019{
1020 struct proc_dir_entry *entry = NULL;
1021 int i;
1022
1023 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
1024 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
1025 if (!acpi_device_dir(device)) {
1026 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1027 acpi_battery_dir);
1028 if (!acpi_device_dir(device))
1029 return -ENODEV;
1030 }
1031
1032 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
1033 entry = proc_create_data(acpi_battery_file[i].name,
1034 acpi_battery_file[i].mode,
1035 acpi_device_dir(device),
1036 &acpi_battery_file[i].ops,
1037 acpi_driver_data(device));
1038 if (!entry)
1039 return -ENODEV;
1040 }
1041 return 0;
1042}
1043
1044static void acpi_battery_remove_fs(struct acpi_device *device)
1045{
1046 int i;
1047 if (!acpi_device_dir(device))
1048 return;
1049 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
1050 remove_proc_entry(acpi_battery_file[i].name,
1051 acpi_device_dir(device));
1052
1053 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
1054 acpi_device_dir(device) = NULL;
1055}
1056
1057#endif
1058
1059/* --------------------------------------------------------------------------
1060 Driver Interface
1061 -------------------------------------------------------------------------- */
1062
1063static void acpi_battery_notify(struct acpi_device *device, u32 event)
1064{
1065 struct acpi_battery *battery = acpi_driver_data(device);
1066 struct power_supply *old;
1067
1068 if (!battery)
1069 return;
1070 old = battery->bat;
1071 /*
1072 * On Acer Aspire V5-573G notifications are sometimes triggered too
1073 * early. For example, when AC is unplugged and notification is
1074 * triggered, battery state is still reported as "Full", and changes to
1075 * "Discharging" only after short delay, without any notification.
1076 */
1077 if (battery_notification_delay_ms > 0)
1078 msleep(battery_notification_delay_ms);
1079 if (event == ACPI_BATTERY_NOTIFY_INFO)
1080 acpi_battery_refresh(battery);
1081 acpi_battery_update(battery, false);
1082 acpi_bus_generate_netlink_event(device->pnp.device_class,
1083 dev_name(&device->dev), event,
1084 acpi_battery_present(battery));
1085 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1086 /* acpi_battery_update could remove power_supply object */
1087 if (old && battery->bat)
1088 power_supply_changed(battery->bat);
1089}
1090
1091static int battery_notify(struct notifier_block *nb,
1092 unsigned long mode, void *_unused)
1093{
1094 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1095 pm_nb);
1096 int result;
1097
1098 switch (mode) {
1099 case PM_POST_HIBERNATION:
1100 case PM_POST_SUSPEND:
1101 if (!acpi_battery_present(battery))
1102 return 0;
1103
1104 if (!battery->bat) {
1105 result = acpi_battery_get_info(battery);
1106 if (result)
1107 return result;
1108
1109 result = sysfs_add_battery(battery);
1110 if (result)
1111 return result;
1112 } else
1113 acpi_battery_refresh(battery);
1114
1115 acpi_battery_init_alarm(battery);
1116 acpi_battery_get_state(battery);
1117 break;
1118 }
1119
1120 return 0;
1121}
1122
1123static int __init
1124battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1125{
1126 battery_bix_broken_package = 1;
1127 return 0;
1128}
1129
1130static int __init
1131battery_notification_delay_quirk(const struct dmi_system_id *d)
1132{
1133 battery_notification_delay_ms = 1000;
1134 return 0;
1135}
1136
1137static const struct dmi_system_id bat_dmi_table[] __initconst = {
1138 {
1139 .callback = battery_bix_broken_package_quirk,
1140 .ident = "NEC LZ750/LS",
1141 .matches = {
1142 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1143 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1144 },
1145 },
1146 {
1147 .callback = battery_notification_delay_quirk,
1148 .ident = "Acer Aspire V5-573G",
1149 .matches = {
1150 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1151 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1152 },
1153 },
1154 {},
1155};
1156
1157/*
1158 * Some machines'(E,G Lenovo Z480) ECs are not stable
1159 * during boot up and this causes battery driver fails to be
1160 * probed due to failure of getting battery information
1161 * from EC sometimes. After several retries, the operation
1162 * may work. So add retry code here and 20ms sleep between
1163 * every retries.
1164 */
1165static int acpi_battery_update_retry(struct acpi_battery *battery)
1166{
1167 int retry, ret;
1168
1169 for (retry = 5; retry; retry--) {
1170 ret = acpi_battery_update(battery, false);
1171 if (!ret)
1172 break;
1173
1174 msleep(20);
1175 }
1176 return ret;
1177}
1178
1179static int acpi_battery_add(struct acpi_device *device)
1180{
1181 int result = 0;
1182 struct acpi_battery *battery = NULL;
1183
1184 if (!device)
1185 return -EINVAL;
1186
1187 if (device->dep_unmet)
1188 return -EPROBE_DEFER;
1189
1190 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1191 if (!battery)
1192 return -ENOMEM;
1193 battery->device = device;
1194 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1195 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1196 device->driver_data = battery;
1197 mutex_init(&battery->lock);
1198 mutex_init(&battery->sysfs_lock);
1199 if (acpi_has_method(battery->device->handle, "_BIX"))
1200 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1201
1202 result = acpi_battery_update_retry(battery);
1203 if (result)
1204 goto fail;
1205
1206#ifdef CONFIG_ACPI_PROCFS_POWER
1207 result = acpi_battery_add_fs(device);
1208#endif
1209 if (result) {
1210#ifdef CONFIG_ACPI_PROCFS_POWER
1211 acpi_battery_remove_fs(device);
1212#endif
1213 goto fail;
1214 }
1215
1216 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1217 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1218 device->status.battery_present ? "present" : "absent");
1219
1220 battery->pm_nb.notifier_call = battery_notify;
1221 register_pm_notifier(&battery->pm_nb);
1222
1223 device_init_wakeup(&device->dev, 1);
1224
1225 return result;
1226
1227fail:
1228 sysfs_remove_battery(battery);
1229 mutex_destroy(&battery->lock);
1230 mutex_destroy(&battery->sysfs_lock);
1231 kfree(battery);
1232 return result;
1233}
1234
1235static int acpi_battery_remove(struct acpi_device *device)
1236{
1237 struct acpi_battery *battery = NULL;
1238
1239 if (!device || !acpi_driver_data(device))
1240 return -EINVAL;
1241 device_init_wakeup(&device->dev, 0);
1242 battery = acpi_driver_data(device);
1243 unregister_pm_notifier(&battery->pm_nb);
1244#ifdef CONFIG_ACPI_PROCFS_POWER
1245 acpi_battery_remove_fs(device);
1246#endif
1247 sysfs_remove_battery(battery);
1248 mutex_destroy(&battery->lock);
1249 mutex_destroy(&battery->sysfs_lock);
1250 kfree(battery);
1251 return 0;
1252}
1253
1254#ifdef CONFIG_PM_SLEEP
1255/* this is needed to learn about changes made in suspended state */
1256static int acpi_battery_resume(struct device *dev)
1257{
1258 struct acpi_battery *battery;
1259
1260 if (!dev)
1261 return -EINVAL;
1262
1263 battery = acpi_driver_data(to_acpi_device(dev));
1264 if (!battery)
1265 return -EINVAL;
1266
1267 battery->update_time = 0;
1268 acpi_battery_update(battery, true);
1269 return 0;
1270}
1271#else
1272#define acpi_battery_resume NULL
1273#endif
1274
1275static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1276
1277static struct acpi_driver acpi_battery_driver = {
1278 .name = "battery",
1279 .class = ACPI_BATTERY_CLASS,
1280 .ids = battery_device_ids,
1281 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1282 .ops = {
1283 .add = acpi_battery_add,
1284 .remove = acpi_battery_remove,
1285 .notify = acpi_battery_notify,
1286 },
1287 .drv.pm = &acpi_battery_pm,
1288};
1289
1290static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1291{
1292 int result;
1293
1294 dmi_check_system(bat_dmi_table);
1295
1296#ifdef CONFIG_ACPI_PROCFS_POWER
1297 acpi_battery_dir = acpi_lock_battery_dir();
1298 if (!acpi_battery_dir)
1299 return;
1300#endif
1301 result = acpi_bus_register_driver(&acpi_battery_driver);
1302#ifdef CONFIG_ACPI_PROCFS_POWER
1303 if (result < 0)
1304 acpi_unlock_battery_dir(acpi_battery_dir);
1305#endif
1306}
1307
1308static int __init acpi_battery_init(void)
1309{
1310 if (acpi_disabled)
1311 return -ENODEV;
1312
1313 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1314 return 0;
1315}
1316
1317static void __exit acpi_battery_exit(void)
1318{
1319 async_synchronize_cookie(async_cookie);
1320 acpi_bus_unregister_driver(&acpi_battery_driver);
1321#ifdef CONFIG_ACPI_PROCFS_POWER
1322 acpi_unlock_battery_dir(acpi_battery_dir);
1323#endif
1324}
1325
1326module_init(acpi_battery_init);
1327module_exit(acpi_battery_exit);