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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * battery.c - ACPI Battery Driver (Revision: 2.0)
4 *
5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11#define pr_fmt(fmt) "ACPI: battery: " fmt
12
13#include <linux/delay.h>
14#include <linux/dmi.h>
15#include <linux/jiffies.h>
16#include <linux/kernel.h>
17#include <linux/list.h>
18#include <linux/module.h>
19#include <linux/mutex.h>
20#include <linux/slab.h>
21#include <linux/suspend.h>
22#include <linux/types.h>
23
24#include <linux/unaligned.h>
25
26#include <linux/acpi.h>
27#include <linux/power_supply.h>
28
29#include <acpi/battery.h>
30
31#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
32#define ACPI_BATTERY_CAPACITY_VALID(capacity) \
33 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
34
35#define ACPI_BATTERY_DEVICE_NAME "Battery"
36
37/* Battery power unit: 0 means mW, 1 means mA */
38#define ACPI_BATTERY_POWER_UNIT_MA 1
39
40#define ACPI_BATTERY_STATE_DISCHARGING 0x1
41#define ACPI_BATTERY_STATE_CHARGING 0x2
42#define ACPI_BATTERY_STATE_CRITICAL 0x4
43#define ACPI_BATTERY_STATE_CHARGE_LIMITING 0x8
44
45#define MAX_STRING_LENGTH 64
46
47MODULE_AUTHOR("Paul Diefenbaugh");
48MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
49MODULE_DESCRIPTION("ACPI Battery Driver");
50MODULE_LICENSE("GPL");
51
52static int battery_bix_broken_package;
53static int battery_notification_delay_ms;
54static int battery_ac_is_broken;
55static unsigned int cache_time = 1000;
56module_param(cache_time, uint, 0644);
57MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
58
59static const struct acpi_device_id battery_device_ids[] = {
60 {"PNP0C0A", 0},
61
62 /* Microsoft Surface Go 3 */
63 {"MSHW0146", 0},
64
65 {"", 0},
66};
67
68MODULE_DEVICE_TABLE(acpi, battery_device_ids);
69
70enum {
71 ACPI_BATTERY_ALARM_PRESENT,
72 ACPI_BATTERY_XINFO_PRESENT,
73 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
74 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
75 * switches between mWh and mAh depending on whether the system
76 * is running on battery or not. When mAh is the unit, most
77 * reported values are incorrect and need to be adjusted by
78 * 10000/design_voltage. Verified on x201, t410, t410s, and x220.
79 * Pre-2010 and 2012 models appear to always report in mWh and
80 * are thus unaffected (tested with t42, t61, t500, x200, x300,
81 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for
82 * the 2011 models that fixes the issue (tested on x220 with a
83 * post-1.29 BIOS), but as of Nov. 2012, no such update is
84 * available for the 2010 models.
85 */
86 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
87 /* for batteries reporting current capacity with design capacity
88 * on a full charge, but showing degradation in full charge cap.
89 */
90 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
91};
92
93struct acpi_battery {
94 struct mutex lock;
95 struct mutex sysfs_lock;
96 struct power_supply *bat;
97 struct power_supply_desc bat_desc;
98 struct acpi_device *device;
99 struct notifier_block pm_nb;
100 struct list_head list;
101 unsigned long update_time;
102 int revision;
103 int rate_now;
104 int capacity_now;
105 int voltage_now;
106 int design_capacity;
107 int full_charge_capacity;
108 int technology;
109 int design_voltage;
110 int design_capacity_warning;
111 int design_capacity_low;
112 int cycle_count;
113 int measurement_accuracy;
114 int max_sampling_time;
115 int min_sampling_time;
116 int max_averaging_interval;
117 int min_averaging_interval;
118 int capacity_granularity_1;
119 int capacity_granularity_2;
120 int alarm;
121 char model_number[MAX_STRING_LENGTH];
122 char serial_number[MAX_STRING_LENGTH];
123 char type[MAX_STRING_LENGTH];
124 char oem_info[MAX_STRING_LENGTH];
125 int state;
126 int power_unit;
127 unsigned long flags;
128};
129
130#define to_acpi_battery(x) power_supply_get_drvdata(x)
131
132static inline int acpi_battery_present(struct acpi_battery *battery)
133{
134 return battery->device->status.battery_present;
135}
136
137static int acpi_battery_technology(struct acpi_battery *battery)
138{
139 if (!strcasecmp("NiCd", battery->type))
140 return POWER_SUPPLY_TECHNOLOGY_NiCd;
141 if (!strcasecmp("NiMH", battery->type))
142 return POWER_SUPPLY_TECHNOLOGY_NiMH;
143 if (!strcasecmp("LION", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_LION;
145 if (!strncasecmp("LI-ION", battery->type, 6))
146 return POWER_SUPPLY_TECHNOLOGY_LION;
147 if (!strcasecmp("LiP", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_LIPO;
149 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
150}
151
152static int acpi_battery_get_state(struct acpi_battery *battery);
153
154static int acpi_battery_is_charged(struct acpi_battery *battery)
155{
156 /* charging, discharging, critical low or charge limited */
157 if (battery->state != 0)
158 return 0;
159
160 /* battery not reporting charge */
161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
162 battery->capacity_now == 0)
163 return 0;
164
165 /* good batteries update full_charge as the batteries degrade */
166 if (battery->full_charge_capacity == battery->capacity_now)
167 return 1;
168
169 /* fallback to using design values for broken batteries */
170 if (battery->design_capacity <= battery->capacity_now)
171 return 1;
172
173 /* we don't do any sort of metric based on percentages */
174 return 0;
175}
176
177static bool acpi_battery_is_degraded(struct acpi_battery *battery)
178{
179 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
180 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
181 battery->full_charge_capacity < battery->design_capacity;
182}
183
184static int acpi_battery_handle_discharging(struct acpi_battery *battery)
185{
186 /*
187 * Some devices wrongly report discharging if the battery's charge level
188 * was above the device's start charging threshold atm the AC adapter
189 * was plugged in and the device thus did not start a new charge cycle.
190 */
191 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
192 battery->rate_now == 0)
193 return POWER_SUPPLY_STATUS_NOT_CHARGING;
194
195 return POWER_SUPPLY_STATUS_DISCHARGING;
196}
197
198static int acpi_battery_get_property(struct power_supply *psy,
199 enum power_supply_property psp,
200 union power_supply_propval *val)
201{
202 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
203 struct acpi_battery *battery = to_acpi_battery(psy);
204
205 if (acpi_battery_present(battery)) {
206 /* run battery update only if it is present */
207 acpi_battery_get_state(battery);
208 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
209 return -ENODEV;
210 switch (psp) {
211 case POWER_SUPPLY_PROP_STATUS:
212 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
213 val->intval = acpi_battery_handle_discharging(battery);
214 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
215 val->intval = POWER_SUPPLY_STATUS_CHARGING;
216 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING)
217 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
218 else if (acpi_battery_is_charged(battery))
219 val->intval = POWER_SUPPLY_STATUS_FULL;
220 else
221 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
222 break;
223 case POWER_SUPPLY_PROP_PRESENT:
224 val->intval = acpi_battery_present(battery);
225 break;
226 case POWER_SUPPLY_PROP_TECHNOLOGY:
227 val->intval = acpi_battery_technology(battery);
228 break;
229 case POWER_SUPPLY_PROP_CYCLE_COUNT:
230 val->intval = battery->cycle_count;
231 break;
232 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
233 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
234 ret = -ENODEV;
235 else
236 val->intval = battery->design_voltage * 1000;
237 break;
238 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
239 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
240 ret = -ENODEV;
241 else
242 val->intval = battery->voltage_now * 1000;
243 break;
244 case POWER_SUPPLY_PROP_CURRENT_NOW:
245 case POWER_SUPPLY_PROP_POWER_NOW:
246 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
247 ret = -ENODEV;
248 else
249 val->intval = battery->rate_now * 1000;
250 break;
251 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
252 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
253 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
254 ret = -ENODEV;
255 else
256 val->intval = battery->design_capacity * 1000;
257 break;
258 case POWER_SUPPLY_PROP_CHARGE_FULL:
259 case POWER_SUPPLY_PROP_ENERGY_FULL:
260 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
261 ret = -ENODEV;
262 else
263 val->intval = battery->full_charge_capacity * 1000;
264 break;
265 case POWER_SUPPLY_PROP_CHARGE_NOW:
266 case POWER_SUPPLY_PROP_ENERGY_NOW:
267 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
268 ret = -ENODEV;
269 else
270 val->intval = battery->capacity_now * 1000;
271 break;
272 case POWER_SUPPLY_PROP_CAPACITY:
273 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
274 full_capacity = battery->full_charge_capacity;
275 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
276 full_capacity = battery->design_capacity;
277
278 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
279 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
280 ret = -ENODEV;
281 else
282 val->intval = battery->capacity_now * 100/
283 full_capacity;
284 break;
285 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
286 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
287 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
288 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
289 (battery->capacity_now <= battery->alarm))
290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
291 else if (acpi_battery_is_charged(battery))
292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
293 else
294 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
295 break;
296 case POWER_SUPPLY_PROP_MODEL_NAME:
297 val->strval = battery->model_number;
298 break;
299 case POWER_SUPPLY_PROP_MANUFACTURER:
300 val->strval = battery->oem_info;
301 break;
302 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
303 val->strval = battery->serial_number;
304 break;
305 default:
306 ret = -EINVAL;
307 }
308 return ret;
309}
310
311static const enum power_supply_property charge_battery_props[] = {
312 POWER_SUPPLY_PROP_STATUS,
313 POWER_SUPPLY_PROP_PRESENT,
314 POWER_SUPPLY_PROP_TECHNOLOGY,
315 POWER_SUPPLY_PROP_CYCLE_COUNT,
316 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
317 POWER_SUPPLY_PROP_VOLTAGE_NOW,
318 POWER_SUPPLY_PROP_CURRENT_NOW,
319 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
320 POWER_SUPPLY_PROP_CHARGE_FULL,
321 POWER_SUPPLY_PROP_CHARGE_NOW,
322 POWER_SUPPLY_PROP_CAPACITY,
323 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
324 POWER_SUPPLY_PROP_MODEL_NAME,
325 POWER_SUPPLY_PROP_MANUFACTURER,
326 POWER_SUPPLY_PROP_SERIAL_NUMBER,
327};
328
329static const enum power_supply_property charge_battery_full_cap_broken_props[] = {
330 POWER_SUPPLY_PROP_STATUS,
331 POWER_SUPPLY_PROP_PRESENT,
332 POWER_SUPPLY_PROP_TECHNOLOGY,
333 POWER_SUPPLY_PROP_CYCLE_COUNT,
334 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
335 POWER_SUPPLY_PROP_VOLTAGE_NOW,
336 POWER_SUPPLY_PROP_CURRENT_NOW,
337 POWER_SUPPLY_PROP_CHARGE_NOW,
338 POWER_SUPPLY_PROP_MODEL_NAME,
339 POWER_SUPPLY_PROP_MANUFACTURER,
340 POWER_SUPPLY_PROP_SERIAL_NUMBER,
341};
342
343static const enum power_supply_property energy_battery_props[] = {
344 POWER_SUPPLY_PROP_STATUS,
345 POWER_SUPPLY_PROP_PRESENT,
346 POWER_SUPPLY_PROP_TECHNOLOGY,
347 POWER_SUPPLY_PROP_CYCLE_COUNT,
348 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
349 POWER_SUPPLY_PROP_VOLTAGE_NOW,
350 POWER_SUPPLY_PROP_POWER_NOW,
351 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
352 POWER_SUPPLY_PROP_ENERGY_FULL,
353 POWER_SUPPLY_PROP_ENERGY_NOW,
354 POWER_SUPPLY_PROP_CAPACITY,
355 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
356 POWER_SUPPLY_PROP_MODEL_NAME,
357 POWER_SUPPLY_PROP_MANUFACTURER,
358 POWER_SUPPLY_PROP_SERIAL_NUMBER,
359};
360
361static const enum power_supply_property energy_battery_full_cap_broken_props[] = {
362 POWER_SUPPLY_PROP_STATUS,
363 POWER_SUPPLY_PROP_PRESENT,
364 POWER_SUPPLY_PROP_TECHNOLOGY,
365 POWER_SUPPLY_PROP_CYCLE_COUNT,
366 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
367 POWER_SUPPLY_PROP_VOLTAGE_NOW,
368 POWER_SUPPLY_PROP_POWER_NOW,
369 POWER_SUPPLY_PROP_ENERGY_NOW,
370 POWER_SUPPLY_PROP_MODEL_NAME,
371 POWER_SUPPLY_PROP_MANUFACTURER,
372 POWER_SUPPLY_PROP_SERIAL_NUMBER,
373};
374
375/* Battery Management */
376struct acpi_offsets {
377 size_t offset; /* offset inside struct acpi_sbs_battery */
378 u8 mode; /* int or string? */
379};
380
381static const struct acpi_offsets state_offsets[] = {
382 {offsetof(struct acpi_battery, state), 0},
383 {offsetof(struct acpi_battery, rate_now), 0},
384 {offsetof(struct acpi_battery, capacity_now), 0},
385 {offsetof(struct acpi_battery, voltage_now), 0},
386};
387
388static const struct acpi_offsets info_offsets[] = {
389 {offsetof(struct acpi_battery, power_unit), 0},
390 {offsetof(struct acpi_battery, design_capacity), 0},
391 {offsetof(struct acpi_battery, full_charge_capacity), 0},
392 {offsetof(struct acpi_battery, technology), 0},
393 {offsetof(struct acpi_battery, design_voltage), 0},
394 {offsetof(struct acpi_battery, design_capacity_warning), 0},
395 {offsetof(struct acpi_battery, design_capacity_low), 0},
396 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
397 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
398 {offsetof(struct acpi_battery, model_number), 1},
399 {offsetof(struct acpi_battery, serial_number), 1},
400 {offsetof(struct acpi_battery, type), 1},
401 {offsetof(struct acpi_battery, oem_info), 1},
402};
403
404static const struct acpi_offsets extended_info_offsets[] = {
405 {offsetof(struct acpi_battery, revision), 0},
406 {offsetof(struct acpi_battery, power_unit), 0},
407 {offsetof(struct acpi_battery, design_capacity), 0},
408 {offsetof(struct acpi_battery, full_charge_capacity), 0},
409 {offsetof(struct acpi_battery, technology), 0},
410 {offsetof(struct acpi_battery, design_voltage), 0},
411 {offsetof(struct acpi_battery, design_capacity_warning), 0},
412 {offsetof(struct acpi_battery, design_capacity_low), 0},
413 {offsetof(struct acpi_battery, cycle_count), 0},
414 {offsetof(struct acpi_battery, measurement_accuracy), 0},
415 {offsetof(struct acpi_battery, max_sampling_time), 0},
416 {offsetof(struct acpi_battery, min_sampling_time), 0},
417 {offsetof(struct acpi_battery, max_averaging_interval), 0},
418 {offsetof(struct acpi_battery, min_averaging_interval), 0},
419 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
420 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
421 {offsetof(struct acpi_battery, model_number), 1},
422 {offsetof(struct acpi_battery, serial_number), 1},
423 {offsetof(struct acpi_battery, type), 1},
424 {offsetof(struct acpi_battery, oem_info), 1},
425};
426
427static int extract_package(struct acpi_battery *battery,
428 union acpi_object *package,
429 const struct acpi_offsets *offsets, int num)
430{
431 int i;
432 union acpi_object *element;
433
434 if (package->type != ACPI_TYPE_PACKAGE)
435 return -EFAULT;
436 for (i = 0; i < num; ++i) {
437 if (package->package.count <= i)
438 return -EFAULT;
439 element = &package->package.elements[i];
440 if (offsets[i].mode) {
441 u8 *ptr = (u8 *)battery + offsets[i].offset;
442 u32 len = MAX_STRING_LENGTH;
443
444 switch (element->type) {
445 case ACPI_TYPE_BUFFER:
446 if (len > element->buffer.length + 1)
447 len = element->buffer.length + 1;
448
449 fallthrough;
450 case ACPI_TYPE_STRING:
451 strscpy(ptr, element->string.pointer, len);
452
453 break;
454 case ACPI_TYPE_INTEGER:
455 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1);
456
457 break;
458 default:
459 *ptr = 0; /* don't have value */
460 }
461 } else {
462 int *x = (int *)((u8 *)battery + offsets[i].offset);
463 *x = (element->type == ACPI_TYPE_INTEGER) ?
464 element->integer.value : -1;
465 }
466 }
467 return 0;
468}
469
470static int acpi_battery_get_status(struct acpi_battery *battery)
471{
472 if (acpi_bus_get_status(battery->device)) {
473 acpi_handle_info(battery->device->handle,
474 "_STA evaluation failed\n");
475 return -ENODEV;
476 }
477 return 0;
478}
479
480
481static int extract_battery_info(const int use_bix,
482 struct acpi_battery *battery,
483 const struct acpi_buffer *buffer)
484{
485 int result = -EFAULT;
486
487 if (use_bix && battery_bix_broken_package)
488 result = extract_package(battery, buffer->pointer,
489 extended_info_offsets + 1,
490 ARRAY_SIZE(extended_info_offsets) - 1);
491 else if (use_bix)
492 result = extract_package(battery, buffer->pointer,
493 extended_info_offsets,
494 ARRAY_SIZE(extended_info_offsets));
495 else
496 result = extract_package(battery, buffer->pointer,
497 info_offsets, ARRAY_SIZE(info_offsets));
498 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
499 battery->full_charge_capacity = battery->design_capacity;
500 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
501 battery->power_unit && battery->design_voltage) {
502 battery->design_capacity = battery->design_capacity *
503 10000 / battery->design_voltage;
504 battery->full_charge_capacity = battery->full_charge_capacity *
505 10000 / battery->design_voltage;
506 battery->design_capacity_warning =
507 battery->design_capacity_warning *
508 10000 / battery->design_voltage;
509 /* Curiously, design_capacity_low, unlike the rest of them,
510 * is correct.
511 */
512 /* capacity_granularity_* equal 1 on the systems tested, so
513 * it's impossible to tell if they would need an adjustment
514 * or not if their values were higher.
515 */
516 }
517 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
518 battery->capacity_now > battery->full_charge_capacity)
519 battery->capacity_now = battery->full_charge_capacity;
520
521 return result;
522}
523
524static int acpi_battery_get_info(struct acpi_battery *battery)
525{
526 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
527 int use_bix;
528 int result = -ENODEV;
529
530 if (!acpi_battery_present(battery))
531 return 0;
532
533
534 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
535 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
536 acpi_status status = AE_ERROR;
537
538 mutex_lock(&battery->lock);
539 status = acpi_evaluate_object(battery->device->handle,
540 use_bix ? "_BIX":"_BIF",
541 NULL, &buffer);
542 mutex_unlock(&battery->lock);
543
544 if (ACPI_FAILURE(status)) {
545 acpi_handle_info(battery->device->handle,
546 "%s evaluation failed: %s\n",
547 use_bix ? "_BIX":"_BIF",
548 acpi_format_exception(status));
549 } else {
550 result = extract_battery_info(use_bix,
551 battery,
552 &buffer);
553
554 kfree(buffer.pointer);
555 break;
556 }
557 }
558
559 if (!result && !use_bix && xinfo)
560 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
561
562 return result;
563}
564
565static int acpi_battery_get_state(struct acpi_battery *battery)
566{
567 int result = 0;
568 acpi_status status = 0;
569 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
570
571 if (!acpi_battery_present(battery))
572 return 0;
573
574 if (battery->update_time &&
575 time_before(jiffies, battery->update_time +
576 msecs_to_jiffies(cache_time)))
577 return 0;
578
579 mutex_lock(&battery->lock);
580 status = acpi_evaluate_object(battery->device->handle, "_BST",
581 NULL, &buffer);
582 mutex_unlock(&battery->lock);
583
584 if (ACPI_FAILURE(status)) {
585 acpi_handle_info(battery->device->handle,
586 "_BST evaluation failed: %s",
587 acpi_format_exception(status));
588 return -ENODEV;
589 }
590
591 result = extract_package(battery, buffer.pointer,
592 state_offsets, ARRAY_SIZE(state_offsets));
593 battery->update_time = jiffies;
594 kfree(buffer.pointer);
595
596 /* For buggy DSDTs that report negative 16-bit values for either
597 * charging or discharging current and/or report 0 as 65536
598 * due to bad math.
599 */
600 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
601 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
602 (s16)(battery->rate_now) < 0) {
603 battery->rate_now = abs((s16)battery->rate_now);
604 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
605 }
606
607 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
608 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
609 battery->capacity_now = (battery->capacity_now *
610 battery->full_charge_capacity) / 100;
611 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
612 battery->power_unit && battery->design_voltage) {
613 battery->capacity_now = battery->capacity_now *
614 10000 / battery->design_voltage;
615 }
616 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
617 battery->capacity_now > battery->full_charge_capacity)
618 battery->capacity_now = battery->full_charge_capacity;
619
620 return result;
621}
622
623static int acpi_battery_set_alarm(struct acpi_battery *battery)
624{
625 acpi_status status = 0;
626
627 if (!acpi_battery_present(battery) ||
628 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
629 return -ENODEV;
630
631 mutex_lock(&battery->lock);
632 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
633 battery->alarm);
634 mutex_unlock(&battery->lock);
635
636 if (ACPI_FAILURE(status))
637 return -ENODEV;
638
639 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
640 battery->alarm);
641
642 return 0;
643}
644
645static int acpi_battery_init_alarm(struct acpi_battery *battery)
646{
647 /* See if alarms are supported, and if so, set default */
648 if (!acpi_has_method(battery->device->handle, "_BTP")) {
649 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
650 return 0;
651 }
652 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
653 if (!battery->alarm)
654 battery->alarm = battery->design_capacity_warning;
655 return acpi_battery_set_alarm(battery);
656}
657
658static ssize_t acpi_battery_alarm_show(struct device *dev,
659 struct device_attribute *attr,
660 char *buf)
661{
662 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
663
664 return sysfs_emit(buf, "%d\n", battery->alarm * 1000);
665}
666
667static ssize_t acpi_battery_alarm_store(struct device *dev,
668 struct device_attribute *attr,
669 const char *buf, size_t count)
670{
671 unsigned long x;
672 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
673
674 if (sscanf(buf, "%lu\n", &x) == 1)
675 battery->alarm = x/1000;
676 if (acpi_battery_present(battery))
677 acpi_battery_set_alarm(battery);
678 return count;
679}
680
681static struct device_attribute alarm_attr = {
682 .attr = {.name = "alarm", .mode = 0644},
683 .show = acpi_battery_alarm_show,
684 .store = acpi_battery_alarm_store,
685};
686
687static struct attribute *acpi_battery_attrs[] = {
688 &alarm_attr.attr,
689 NULL
690};
691ATTRIBUTE_GROUPS(acpi_battery);
692
693/*
694 * The Battery Hooking API
695 *
696 * This API is used inside other drivers that need to expose
697 * platform-specific behaviour within the generic driver in a
698 * generic way.
699 *
700 */
701
702static LIST_HEAD(acpi_battery_list);
703static LIST_HEAD(battery_hook_list);
704static DEFINE_MUTEX(hook_mutex);
705
706static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook)
707{
708 struct acpi_battery *battery;
709
710 /*
711 * In order to remove a hook, we first need to
712 * de-register all the batteries that are registered.
713 */
714 list_for_each_entry(battery, &acpi_battery_list, list) {
715 if (!hook->remove_battery(battery->bat, hook))
716 power_supply_changed(battery->bat);
717 }
718 list_del_init(&hook->list);
719
720 pr_info("extension unregistered: %s\n", hook->name);
721}
722
723void battery_hook_unregister(struct acpi_battery_hook *hook)
724{
725 mutex_lock(&hook_mutex);
726 /*
727 * Ignore already unregistered battery hooks. This might happen
728 * if a battery hook was previously unloaded due to an error when
729 * adding a new battery.
730 */
731 if (!list_empty(&hook->list))
732 battery_hook_unregister_unlocked(hook);
733
734 mutex_unlock(&hook_mutex);
735}
736EXPORT_SYMBOL_GPL(battery_hook_unregister);
737
738void battery_hook_register(struct acpi_battery_hook *hook)
739{
740 struct acpi_battery *battery;
741
742 mutex_lock(&hook_mutex);
743 list_add(&hook->list, &battery_hook_list);
744 /*
745 * Now that the driver is registered, we need
746 * to notify the hook that a battery is available
747 * for each battery, so that the driver may add
748 * its attributes.
749 */
750 list_for_each_entry(battery, &acpi_battery_list, list) {
751 if (hook->add_battery(battery->bat, hook)) {
752 /*
753 * If a add-battery returns non-zero,
754 * the registration of the extension has failed,
755 * and we will not add it to the list of loaded
756 * hooks.
757 */
758 pr_err("extension failed to load: %s", hook->name);
759 battery_hook_unregister_unlocked(hook);
760 goto end;
761 }
762
763 power_supply_changed(battery->bat);
764 }
765 pr_info("new extension: %s\n", hook->name);
766end:
767 mutex_unlock(&hook_mutex);
768}
769EXPORT_SYMBOL_GPL(battery_hook_register);
770
771static void devm_battery_hook_unregister(void *data)
772{
773 struct acpi_battery_hook *hook = data;
774
775 battery_hook_unregister(hook);
776}
777
778int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook)
779{
780 battery_hook_register(hook);
781
782 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook);
783}
784EXPORT_SYMBOL_GPL(devm_battery_hook_register);
785
786/*
787 * This function gets called right after the battery sysfs
788 * attributes have been added, so that the drivers that
789 * define custom sysfs attributes can add their own.
790 */
791static void battery_hook_add_battery(struct acpi_battery *battery)
792{
793 struct acpi_battery_hook *hook_node, *tmp;
794
795 mutex_lock(&hook_mutex);
796 INIT_LIST_HEAD(&battery->list);
797 list_add(&battery->list, &acpi_battery_list);
798 /*
799 * Since we added a new battery to the list, we need to
800 * iterate over the hooks and call add_battery for each
801 * hook that was registered. This usually happens
802 * when a battery gets hotplugged or initialized
803 * during the battery module initialization.
804 */
805 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
806 if (hook_node->add_battery(battery->bat, hook_node)) {
807 /*
808 * The notification of the extensions has failed, to
809 * prevent further errors we will unload the extension.
810 */
811 pr_err("error in extension, unloading: %s",
812 hook_node->name);
813 battery_hook_unregister_unlocked(hook_node);
814 }
815 }
816 mutex_unlock(&hook_mutex);
817}
818
819static void battery_hook_remove_battery(struct acpi_battery *battery)
820{
821 struct acpi_battery_hook *hook;
822
823 mutex_lock(&hook_mutex);
824 /*
825 * Before removing the hook, we need to remove all
826 * custom attributes from the battery.
827 */
828 list_for_each_entry(hook, &battery_hook_list, list) {
829 hook->remove_battery(battery->bat, hook);
830 }
831 /* Then, just remove the battery from the list */
832 list_del(&battery->list);
833 mutex_unlock(&hook_mutex);
834}
835
836static void __exit battery_hook_exit(void)
837{
838 struct acpi_battery_hook *hook;
839 struct acpi_battery_hook *ptr;
840 /*
841 * At this point, the acpi_bus_unregister_driver()
842 * has called remove for all batteries. We just
843 * need to remove the hooks.
844 */
845 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
846 battery_hook_unregister(hook);
847 }
848 mutex_destroy(&hook_mutex);
849}
850
851static int sysfs_add_battery(struct acpi_battery *battery)
852{
853 struct power_supply_config psy_cfg = {
854 .drv_data = battery,
855 .attr_grp = acpi_battery_groups,
856 .no_wakeup_source = true,
857 };
858 bool full_cap_broken = false;
859
860 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
861 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
862 full_cap_broken = true;
863
864 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
865 if (full_cap_broken) {
866 battery->bat_desc.properties =
867 charge_battery_full_cap_broken_props;
868 battery->bat_desc.num_properties =
869 ARRAY_SIZE(charge_battery_full_cap_broken_props);
870 } else {
871 battery->bat_desc.properties = charge_battery_props;
872 battery->bat_desc.num_properties =
873 ARRAY_SIZE(charge_battery_props);
874 }
875 } else {
876 if (full_cap_broken) {
877 battery->bat_desc.properties =
878 energy_battery_full_cap_broken_props;
879 battery->bat_desc.num_properties =
880 ARRAY_SIZE(energy_battery_full_cap_broken_props);
881 } else {
882 battery->bat_desc.properties = energy_battery_props;
883 battery->bat_desc.num_properties =
884 ARRAY_SIZE(energy_battery_props);
885 }
886 }
887
888 battery->bat_desc.name = acpi_device_bid(battery->device);
889 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
890 battery->bat_desc.get_property = acpi_battery_get_property;
891
892 battery->bat = power_supply_register(&battery->device->dev,
893 &battery->bat_desc, &psy_cfg);
894
895 if (IS_ERR(battery->bat)) {
896 int result = PTR_ERR(battery->bat);
897
898 battery->bat = NULL;
899 return result;
900 }
901 battery_hook_add_battery(battery);
902 return 0;
903}
904
905static void sysfs_remove_battery(struct acpi_battery *battery)
906{
907 mutex_lock(&battery->sysfs_lock);
908 if (!battery->bat) {
909 mutex_unlock(&battery->sysfs_lock);
910 return;
911 }
912 battery_hook_remove_battery(battery);
913 power_supply_unregister(battery->bat);
914 battery->bat = NULL;
915 mutex_unlock(&battery->sysfs_lock);
916}
917
918static void find_battery(const struct dmi_header *dm, void *private)
919{
920 struct acpi_battery *battery = (struct acpi_battery *)private;
921 /* Note: the hardcoded offsets below have been extracted from
922 * the source code of dmidecode.
923 */
924 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
925 const u8 *dmi_data = (const u8 *)(dm + 1);
926 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
927
928 if (dm->length >= 18)
929 dmi_capacity *= dmi_data[17];
930 if (battery->design_capacity * battery->design_voltage / 1000
931 != dmi_capacity &&
932 battery->design_capacity * 10 == dmi_capacity)
933 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
934 &battery->flags);
935 }
936}
937
938/*
939 * According to the ACPI spec, some kinds of primary batteries can
940 * report percentage battery remaining capacity directly to OS.
941 * In this case, it reports the Last Full Charged Capacity == 100
942 * and BatteryPresentRate == 0xFFFFFFFF.
943 *
944 * Now we found some battery reports percentage remaining capacity
945 * even if it's rechargeable.
946 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
947 *
948 * Handle this correctly so that they won't break userspace.
949 */
950static void acpi_battery_quirks(struct acpi_battery *battery)
951{
952 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
953 return;
954
955 if (battery->full_charge_capacity == 100 &&
956 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
957 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
958 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
959 battery->full_charge_capacity = battery->design_capacity;
960 battery->capacity_now = (battery->capacity_now *
961 battery->full_charge_capacity) / 100;
962 }
963
964 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
965 return;
966
967 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
968 const char *s;
969
970 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
971 if (s && !strncasecmp(s, "ThinkPad", 8)) {
972 dmi_walk(find_battery, battery);
973 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
974 &battery->flags) &&
975 battery->design_voltage) {
976 battery->design_capacity =
977 battery->design_capacity *
978 10000 / battery->design_voltage;
979 battery->full_charge_capacity =
980 battery->full_charge_capacity *
981 10000 / battery->design_voltage;
982 battery->design_capacity_warning =
983 battery->design_capacity_warning *
984 10000 / battery->design_voltage;
985 battery->capacity_now = battery->capacity_now *
986 10000 / battery->design_voltage;
987 }
988 }
989 }
990
991 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
992 return;
993
994 if (acpi_battery_is_degraded(battery) &&
995 battery->capacity_now > battery->full_charge_capacity) {
996 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
997 battery->capacity_now = battery->full_charge_capacity;
998 }
999}
1000
1001static int acpi_battery_update(struct acpi_battery *battery, bool resume)
1002{
1003 int result = acpi_battery_get_status(battery);
1004
1005 if (result)
1006 return result;
1007
1008 if (!acpi_battery_present(battery)) {
1009 sysfs_remove_battery(battery);
1010 battery->update_time = 0;
1011 return 0;
1012 }
1013
1014 if (resume)
1015 return 0;
1016
1017 if (!battery->update_time) {
1018 result = acpi_battery_get_info(battery);
1019 if (result)
1020 return result;
1021 acpi_battery_init_alarm(battery);
1022 }
1023
1024 result = acpi_battery_get_state(battery);
1025 if (result)
1026 return result;
1027 acpi_battery_quirks(battery);
1028
1029 if (!battery->bat) {
1030 result = sysfs_add_battery(battery);
1031 if (result)
1032 return result;
1033 }
1034
1035 /*
1036 * Wakeup the system if battery is critical low
1037 * or lower than the alarm level
1038 */
1039 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
1040 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1041 (battery->capacity_now <= battery->alarm)))
1042 acpi_pm_wakeup_event(&battery->device->dev);
1043
1044 return result;
1045}
1046
1047static void acpi_battery_refresh(struct acpi_battery *battery)
1048{
1049 int power_unit;
1050
1051 if (!battery->bat)
1052 return;
1053
1054 power_unit = battery->power_unit;
1055
1056 acpi_battery_get_info(battery);
1057
1058 if (power_unit == battery->power_unit)
1059 return;
1060
1061 /* The battery has changed its reporting units. */
1062 sysfs_remove_battery(battery);
1063 sysfs_add_battery(battery);
1064}
1065
1066/* Driver Interface */
1067static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
1068{
1069 struct acpi_device *device = data;
1070 struct acpi_battery *battery = acpi_driver_data(device);
1071 struct power_supply *old;
1072
1073 if (!battery)
1074 return;
1075 old = battery->bat;
1076 /*
1077 * On Acer Aspire V5-573G notifications are sometimes triggered too
1078 * early. For example, when AC is unplugged and notification is
1079 * triggered, battery state is still reported as "Full", and changes to
1080 * "Discharging" only after short delay, without any notification.
1081 */
1082 if (battery_notification_delay_ms > 0)
1083 msleep(battery_notification_delay_ms);
1084 if (event == ACPI_BATTERY_NOTIFY_INFO)
1085 acpi_battery_refresh(battery);
1086 acpi_battery_update(battery, false);
1087 acpi_bus_generate_netlink_event(device->pnp.device_class,
1088 dev_name(&device->dev), event,
1089 acpi_battery_present(battery));
1090 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1091 /* acpi_battery_update could remove power_supply object */
1092 if (old && battery->bat)
1093 power_supply_changed(battery->bat);
1094}
1095
1096static int battery_notify(struct notifier_block *nb,
1097 unsigned long mode, void *_unused)
1098{
1099 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1100 pm_nb);
1101 int result;
1102
1103 switch (mode) {
1104 case PM_POST_HIBERNATION:
1105 case PM_POST_SUSPEND:
1106 if (!acpi_battery_present(battery))
1107 return 0;
1108
1109 if (battery->bat) {
1110 acpi_battery_refresh(battery);
1111 } else {
1112 result = acpi_battery_get_info(battery);
1113 if (result)
1114 return result;
1115
1116 result = sysfs_add_battery(battery);
1117 if (result)
1118 return result;
1119 }
1120
1121 acpi_battery_init_alarm(battery);
1122 acpi_battery_get_state(battery);
1123 break;
1124 }
1125
1126 return 0;
1127}
1128
1129static int __init
1130battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1131{
1132 battery_bix_broken_package = 1;
1133 return 0;
1134}
1135
1136static int __init
1137battery_notification_delay_quirk(const struct dmi_system_id *d)
1138{
1139 battery_notification_delay_ms = 1000;
1140 return 0;
1141}
1142
1143static int __init
1144battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1145{
1146 battery_ac_is_broken = 1;
1147 return 0;
1148}
1149
1150static const struct dmi_system_id bat_dmi_table[] __initconst = {
1151 {
1152 /* NEC LZ750/LS */
1153 .callback = battery_bix_broken_package_quirk,
1154 .matches = {
1155 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1156 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1157 },
1158 },
1159 {
1160 /* Acer Aspire V5-573G */
1161 .callback = battery_notification_delay_quirk,
1162 .matches = {
1163 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1164 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1165 },
1166 },
1167 {
1168 /* Point of View mobii wintab p800w */
1169 .callback = battery_ac_is_broken_quirk,
1170 .matches = {
1171 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1172 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1173 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1174 /* Above matches are too generic, add bios-date match */
1175 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1176 },
1177 },
1178 {
1179 /* Microsoft Surface Go 3 */
1180 .callback = battery_notification_delay_quirk,
1181 .matches = {
1182 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1183 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1184 },
1185 },
1186 {},
1187};
1188
1189/*
1190 * Some machines'(E,G Lenovo Z480) ECs are not stable
1191 * during boot up and this causes battery driver fails to be
1192 * probed due to failure of getting battery information
1193 * from EC sometimes. After several retries, the operation
1194 * may work. So add retry code here and 20ms sleep between
1195 * every retries.
1196 */
1197static int acpi_battery_update_retry(struct acpi_battery *battery)
1198{
1199 int retry, ret;
1200
1201 for (retry = 5; retry; retry--) {
1202 ret = acpi_battery_update(battery, false);
1203 if (!ret)
1204 break;
1205
1206 msleep(20);
1207 }
1208 return ret;
1209}
1210
1211static int acpi_battery_add(struct acpi_device *device)
1212{
1213 int result = 0;
1214 struct acpi_battery *battery;
1215
1216 if (!device)
1217 return -EINVAL;
1218
1219 if (device->dep_unmet)
1220 return -EPROBE_DEFER;
1221
1222 battery = devm_kzalloc(&device->dev, sizeof(*battery), GFP_KERNEL);
1223 if (!battery)
1224 return -ENOMEM;
1225 battery->device = device;
1226 strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1227 strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1228 device->driver_data = battery;
1229 result = devm_mutex_init(&device->dev, &battery->lock);
1230 if (result)
1231 return result;
1232
1233 result = devm_mutex_init(&device->dev, &battery->sysfs_lock);
1234 if (result)
1235 return result;
1236
1237 if (acpi_has_method(battery->device->handle, "_BIX"))
1238 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1239
1240 result = acpi_battery_update_retry(battery);
1241 if (result)
1242 goto fail;
1243
1244 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1245 device->status.battery_present ? "present" : "absent");
1246
1247 battery->pm_nb.notifier_call = battery_notify;
1248 result = register_pm_notifier(&battery->pm_nb);
1249 if (result)
1250 goto fail;
1251
1252 device_init_wakeup(&device->dev, 1);
1253
1254 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
1255 acpi_battery_notify, device);
1256 if (result)
1257 goto fail_pm;
1258
1259 return 0;
1260
1261fail_pm:
1262 device_init_wakeup(&device->dev, 0);
1263 unregister_pm_notifier(&battery->pm_nb);
1264fail:
1265 sysfs_remove_battery(battery);
1266
1267 return result;
1268}
1269
1270static void acpi_battery_remove(struct acpi_device *device)
1271{
1272 struct acpi_battery *battery;
1273
1274 if (!device || !acpi_driver_data(device))
1275 return;
1276
1277 battery = acpi_driver_data(device);
1278
1279 acpi_dev_remove_notify_handler(device, ACPI_ALL_NOTIFY,
1280 acpi_battery_notify);
1281
1282 device_init_wakeup(&device->dev, 0);
1283 unregister_pm_notifier(&battery->pm_nb);
1284 sysfs_remove_battery(battery);
1285}
1286
1287/* this is needed to learn about changes made in suspended state */
1288static int acpi_battery_resume(struct device *dev)
1289{
1290 struct acpi_battery *battery;
1291
1292 if (!dev)
1293 return -EINVAL;
1294
1295 battery = acpi_driver_data(to_acpi_device(dev));
1296 if (!battery)
1297 return -EINVAL;
1298
1299 battery->update_time = 0;
1300 acpi_battery_update(battery, true);
1301 return 0;
1302}
1303
1304static DEFINE_SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1305
1306static struct acpi_driver acpi_battery_driver = {
1307 .name = "battery",
1308 .class = ACPI_BATTERY_CLASS,
1309 .ids = battery_device_ids,
1310 .ops = {
1311 .add = acpi_battery_add,
1312 .remove = acpi_battery_remove,
1313 },
1314 .drv.pm = pm_sleep_ptr(&acpi_battery_pm),
1315 .drv.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1316};
1317
1318static int __init acpi_battery_init(void)
1319{
1320 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery())
1321 return -ENODEV;
1322
1323 dmi_check_system(bat_dmi_table);
1324
1325 return acpi_bus_register_driver(&acpi_battery_driver);
1326}
1327
1328static void __exit acpi_battery_exit(void)
1329{
1330 acpi_bus_unregister_driver(&acpi_battery_driver);
1331 battery_hook_exit();
1332}
1333
1334module_init(acpi_battery_init);
1335module_exit(acpi_battery_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * battery.c - ACPI Battery Driver (Revision: 2.0)
4 *
5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " 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#ifdef CONFIG_ACPI_PROCFS_POWER
28#include <linux/proc_fs.h>
29#include <linux/seq_file.h>
30#include <linux/uaccess.h>
31#endif
32
33#include <linux/acpi.h>
34#include <linux/power_supply.h>
35
36#include <acpi/battery.h>
37
38#define PREFIX "ACPI: "
39
40#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
41
42#define ACPI_BATTERY_DEVICE_NAME "Battery"
43
44/* Battery power unit: 0 means mW, 1 means mA */
45#define ACPI_BATTERY_POWER_UNIT_MA 1
46
47#define ACPI_BATTERY_STATE_DISCHARGING 0x1
48#define ACPI_BATTERY_STATE_CHARGING 0x2
49#define ACPI_BATTERY_STATE_CRITICAL 0x4
50
51#define _COMPONENT ACPI_BATTERY_COMPONENT
52
53ACPI_MODULE_NAME("battery");
54
55MODULE_AUTHOR("Paul Diefenbaugh");
56MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
57MODULE_DESCRIPTION("ACPI Battery Driver");
58MODULE_LICENSE("GPL");
59
60static async_cookie_t async_cookie;
61static bool battery_driver_registered;
62static int battery_bix_broken_package;
63static int battery_notification_delay_ms;
64static int battery_ac_is_broken;
65static int battery_check_pmic = 1;
66static unsigned int cache_time = 1000;
67module_param(cache_time, uint, 0644);
68MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
69
70#ifdef CONFIG_ACPI_PROCFS_POWER
71extern struct proc_dir_entry *acpi_lock_battery_dir(void);
72extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
73#endif
74
75static const struct acpi_device_id battery_device_ids[] = {
76 {"PNP0C0A", 0},
77 {"", 0},
78};
79
80MODULE_DEVICE_TABLE(acpi, battery_device_ids);
81
82/* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
83static const char * const acpi_battery_blacklist[] = {
84 "INT33F4", /* X-Powers AXP288 PMIC */
85};
86
87enum {
88 ACPI_BATTERY_ALARM_PRESENT,
89 ACPI_BATTERY_XINFO_PRESENT,
90 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
91 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
92 switches between mWh and mAh depending on whether the system
93 is running on battery or not. When mAh is the unit, most
94 reported values are incorrect and need to be adjusted by
95 10000/design_voltage. Verified on x201, t410, t410s, and x220.
96 Pre-2010 and 2012 models appear to always report in mWh and
97 are thus unaffected (tested with t42, t61, t500, x200, x300,
98 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
99 the 2011 models that fixes the issue (tested on x220 with a
100 post-1.29 BIOS), but as of Nov. 2012, no such update is
101 available for the 2010 models. */
102 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
103 /* for batteries reporting current capacity with design capacity
104 * on a full charge, but showing degradation in full charge cap.
105 */
106 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
107};
108
109struct acpi_battery {
110 struct mutex lock;
111 struct mutex sysfs_lock;
112 struct power_supply *bat;
113 struct power_supply_desc bat_desc;
114 struct acpi_device *device;
115 struct notifier_block pm_nb;
116 struct list_head list;
117 unsigned long update_time;
118 int revision;
119 int rate_now;
120 int capacity_now;
121 int voltage_now;
122 int design_capacity;
123 int full_charge_capacity;
124 int technology;
125 int design_voltage;
126 int design_capacity_warning;
127 int design_capacity_low;
128 int cycle_count;
129 int measurement_accuracy;
130 int max_sampling_time;
131 int min_sampling_time;
132 int max_averaging_interval;
133 int min_averaging_interval;
134 int capacity_granularity_1;
135 int capacity_granularity_2;
136 int alarm;
137 char model_number[32];
138 char serial_number[32];
139 char type[32];
140 char oem_info[32];
141 int state;
142 int power_unit;
143 unsigned long flags;
144};
145
146#define to_acpi_battery(x) power_supply_get_drvdata(x)
147
148static inline int acpi_battery_present(struct acpi_battery *battery)
149{
150 return battery->device->status.battery_present;
151}
152
153static int acpi_battery_technology(struct acpi_battery *battery)
154{
155 if (!strcasecmp("NiCd", battery->type))
156 return POWER_SUPPLY_TECHNOLOGY_NiCd;
157 if (!strcasecmp("NiMH", battery->type))
158 return POWER_SUPPLY_TECHNOLOGY_NiMH;
159 if (!strcasecmp("LION", battery->type))
160 return POWER_SUPPLY_TECHNOLOGY_LION;
161 if (!strncasecmp("LI-ION", battery->type, 6))
162 return POWER_SUPPLY_TECHNOLOGY_LION;
163 if (!strcasecmp("LiP", battery->type))
164 return POWER_SUPPLY_TECHNOLOGY_LIPO;
165 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
166}
167
168static int acpi_battery_get_state(struct acpi_battery *battery);
169
170static int acpi_battery_is_charged(struct acpi_battery *battery)
171{
172 /* charging, discharging or critical low */
173 if (battery->state != 0)
174 return 0;
175
176 /* battery not reporting charge */
177 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
178 battery->capacity_now == 0)
179 return 0;
180
181 /* good batteries update full_charge as the batteries degrade */
182 if (battery->full_charge_capacity == battery->capacity_now)
183 return 1;
184
185 /* fallback to using design values for broken batteries */
186 if (battery->design_capacity == battery->capacity_now)
187 return 1;
188
189 /* we don't do any sort of metric based on percentages */
190 return 0;
191}
192
193static bool acpi_battery_is_degraded(struct acpi_battery *battery)
194{
195 return battery->full_charge_capacity && battery->design_capacity &&
196 battery->full_charge_capacity < battery->design_capacity;
197}
198
199static int acpi_battery_handle_discharging(struct acpi_battery *battery)
200{
201 /*
202 * Some devices wrongly report discharging if the battery's charge level
203 * was above the device's start charging threshold atm the AC adapter
204 * was plugged in and the device thus did not start a new charge cycle.
205 */
206 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
207 battery->rate_now == 0)
208 return POWER_SUPPLY_STATUS_NOT_CHARGING;
209
210 return POWER_SUPPLY_STATUS_DISCHARGING;
211}
212
213static int acpi_battery_get_property(struct power_supply *psy,
214 enum power_supply_property psp,
215 union power_supply_propval *val)
216{
217 int ret = 0;
218 struct acpi_battery *battery = to_acpi_battery(psy);
219
220 if (acpi_battery_present(battery)) {
221 /* run battery update only if it is present */
222 acpi_battery_get_state(battery);
223 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
224 return -ENODEV;
225 switch (psp) {
226 case POWER_SUPPLY_PROP_STATUS:
227 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
228 val->intval = acpi_battery_handle_discharging(battery);
229 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
230 val->intval = POWER_SUPPLY_STATUS_CHARGING;
231 else if (acpi_battery_is_charged(battery))
232 val->intval = POWER_SUPPLY_STATUS_FULL;
233 else
234 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
235 break;
236 case POWER_SUPPLY_PROP_PRESENT:
237 val->intval = acpi_battery_present(battery);
238 break;
239 case POWER_SUPPLY_PROP_TECHNOLOGY:
240 val->intval = acpi_battery_technology(battery);
241 break;
242 case POWER_SUPPLY_PROP_CYCLE_COUNT:
243 val->intval = battery->cycle_count;
244 break;
245 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
246 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
247 ret = -ENODEV;
248 else
249 val->intval = battery->design_voltage * 1000;
250 break;
251 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
252 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
253 ret = -ENODEV;
254 else
255 val->intval = battery->voltage_now * 1000;
256 break;
257 case POWER_SUPPLY_PROP_CURRENT_NOW:
258 case POWER_SUPPLY_PROP_POWER_NOW:
259 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
260 ret = -ENODEV;
261 else
262 val->intval = battery->rate_now * 1000;
263 break;
264 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
265 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
266 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
267 ret = -ENODEV;
268 else
269 val->intval = battery->design_capacity * 1000;
270 break;
271 case POWER_SUPPLY_PROP_CHARGE_FULL:
272 case POWER_SUPPLY_PROP_ENERGY_FULL:
273 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
274 ret = -ENODEV;
275 else
276 val->intval = battery->full_charge_capacity * 1000;
277 break;
278 case POWER_SUPPLY_PROP_CHARGE_NOW:
279 case POWER_SUPPLY_PROP_ENERGY_NOW:
280 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
281 ret = -ENODEV;
282 else
283 val->intval = battery->capacity_now * 1000;
284 break;
285 case POWER_SUPPLY_PROP_CAPACITY:
286 if (battery->capacity_now && battery->full_charge_capacity)
287 val->intval = battery->capacity_now * 100/
288 battery->full_charge_capacity;
289 else
290 val->intval = 0;
291 break;
292 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
293 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
294 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
295 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
296 (battery->capacity_now <= battery->alarm))
297 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
298 else if (acpi_battery_is_charged(battery))
299 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
300 else
301 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
302 break;
303 case POWER_SUPPLY_PROP_MODEL_NAME:
304 val->strval = battery->model_number;
305 break;
306 case POWER_SUPPLY_PROP_MANUFACTURER:
307 val->strval = battery->oem_info;
308 break;
309 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
310 val->strval = battery->serial_number;
311 break;
312 default:
313 ret = -EINVAL;
314 }
315 return ret;
316}
317
318static enum power_supply_property charge_battery_props[] = {
319 POWER_SUPPLY_PROP_STATUS,
320 POWER_SUPPLY_PROP_PRESENT,
321 POWER_SUPPLY_PROP_TECHNOLOGY,
322 POWER_SUPPLY_PROP_CYCLE_COUNT,
323 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
324 POWER_SUPPLY_PROP_VOLTAGE_NOW,
325 POWER_SUPPLY_PROP_CURRENT_NOW,
326 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
327 POWER_SUPPLY_PROP_CHARGE_FULL,
328 POWER_SUPPLY_PROP_CHARGE_NOW,
329 POWER_SUPPLY_PROP_CAPACITY,
330 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
331 POWER_SUPPLY_PROP_MODEL_NAME,
332 POWER_SUPPLY_PROP_MANUFACTURER,
333 POWER_SUPPLY_PROP_SERIAL_NUMBER,
334};
335
336static enum power_supply_property energy_battery_props[] = {
337 POWER_SUPPLY_PROP_STATUS,
338 POWER_SUPPLY_PROP_PRESENT,
339 POWER_SUPPLY_PROP_TECHNOLOGY,
340 POWER_SUPPLY_PROP_CYCLE_COUNT,
341 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
342 POWER_SUPPLY_PROP_VOLTAGE_NOW,
343 POWER_SUPPLY_PROP_POWER_NOW,
344 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
345 POWER_SUPPLY_PROP_ENERGY_FULL,
346 POWER_SUPPLY_PROP_ENERGY_NOW,
347 POWER_SUPPLY_PROP_CAPACITY,
348 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
349 POWER_SUPPLY_PROP_MODEL_NAME,
350 POWER_SUPPLY_PROP_MANUFACTURER,
351 POWER_SUPPLY_PROP_SERIAL_NUMBER,
352};
353
354static enum power_supply_property energy_battery_full_cap_broken_props[] = {
355 POWER_SUPPLY_PROP_STATUS,
356 POWER_SUPPLY_PROP_PRESENT,
357 POWER_SUPPLY_PROP_TECHNOLOGY,
358 POWER_SUPPLY_PROP_CYCLE_COUNT,
359 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
360 POWER_SUPPLY_PROP_VOLTAGE_NOW,
361 POWER_SUPPLY_PROP_POWER_NOW,
362 POWER_SUPPLY_PROP_ENERGY_NOW,
363 POWER_SUPPLY_PROP_MODEL_NAME,
364 POWER_SUPPLY_PROP_MANUFACTURER,
365 POWER_SUPPLY_PROP_SERIAL_NUMBER,
366};
367
368/* --------------------------------------------------------------------------
369 Battery Management
370 -------------------------------------------------------------------------- */
371struct acpi_offsets {
372 size_t offset; /* offset inside struct acpi_sbs_battery */
373 u8 mode; /* int or string? */
374};
375
376static const struct acpi_offsets state_offsets[] = {
377 {offsetof(struct acpi_battery, state), 0},
378 {offsetof(struct acpi_battery, rate_now), 0},
379 {offsetof(struct acpi_battery, capacity_now), 0},
380 {offsetof(struct acpi_battery, voltage_now), 0},
381};
382
383static const struct acpi_offsets info_offsets[] = {
384 {offsetof(struct acpi_battery, power_unit), 0},
385 {offsetof(struct acpi_battery, design_capacity), 0},
386 {offsetof(struct acpi_battery, full_charge_capacity), 0},
387 {offsetof(struct acpi_battery, technology), 0},
388 {offsetof(struct acpi_battery, design_voltage), 0},
389 {offsetof(struct acpi_battery, design_capacity_warning), 0},
390 {offsetof(struct acpi_battery, design_capacity_low), 0},
391 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
392 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
393 {offsetof(struct acpi_battery, model_number), 1},
394 {offsetof(struct acpi_battery, serial_number), 1},
395 {offsetof(struct acpi_battery, type), 1},
396 {offsetof(struct acpi_battery, oem_info), 1},
397};
398
399static const struct acpi_offsets extended_info_offsets[] = {
400 {offsetof(struct acpi_battery, revision), 0},
401 {offsetof(struct acpi_battery, power_unit), 0},
402 {offsetof(struct acpi_battery, design_capacity), 0},
403 {offsetof(struct acpi_battery, full_charge_capacity), 0},
404 {offsetof(struct acpi_battery, technology), 0},
405 {offsetof(struct acpi_battery, design_voltage), 0},
406 {offsetof(struct acpi_battery, design_capacity_warning), 0},
407 {offsetof(struct acpi_battery, design_capacity_low), 0},
408 {offsetof(struct acpi_battery, cycle_count), 0},
409 {offsetof(struct acpi_battery, measurement_accuracy), 0},
410 {offsetof(struct acpi_battery, max_sampling_time), 0},
411 {offsetof(struct acpi_battery, min_sampling_time), 0},
412 {offsetof(struct acpi_battery, max_averaging_interval), 0},
413 {offsetof(struct acpi_battery, min_averaging_interval), 0},
414 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
415 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
416 {offsetof(struct acpi_battery, model_number), 1},
417 {offsetof(struct acpi_battery, serial_number), 1},
418 {offsetof(struct acpi_battery, type), 1},
419 {offsetof(struct acpi_battery, oem_info), 1},
420};
421
422static int extract_package(struct acpi_battery *battery,
423 union acpi_object *package,
424 const struct acpi_offsets *offsets, int num)
425{
426 int i;
427 union acpi_object *element;
428 if (package->type != ACPI_TYPE_PACKAGE)
429 return -EFAULT;
430 for (i = 0; i < num; ++i) {
431 if (package->package.count <= i)
432 return -EFAULT;
433 element = &package->package.elements[i];
434 if (offsets[i].mode) {
435 u8 *ptr = (u8 *)battery + offsets[i].offset;
436 if (element->type == ACPI_TYPE_STRING ||
437 element->type == ACPI_TYPE_BUFFER)
438 strncpy(ptr, element->string.pointer, 32);
439 else if (element->type == ACPI_TYPE_INTEGER) {
440 strncpy(ptr, (u8 *)&element->integer.value,
441 sizeof(u64));
442 ptr[sizeof(u64)] = 0;
443 } else
444 *ptr = 0; /* don't have value */
445 } else {
446 int *x = (int *)((u8 *)battery + offsets[i].offset);
447 *x = (element->type == ACPI_TYPE_INTEGER) ?
448 element->integer.value : -1;
449 }
450 }
451 return 0;
452}
453
454static int acpi_battery_get_status(struct acpi_battery *battery)
455{
456 if (acpi_bus_get_status(battery->device)) {
457 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
458 return -ENODEV;
459 }
460 return 0;
461}
462
463
464static int extract_battery_info(const int use_bix,
465 struct acpi_battery *battery,
466 const struct acpi_buffer *buffer)
467{
468 int result = -EFAULT;
469
470 if (use_bix && battery_bix_broken_package)
471 result = extract_package(battery, buffer->pointer,
472 extended_info_offsets + 1,
473 ARRAY_SIZE(extended_info_offsets) - 1);
474 else if (use_bix)
475 result = extract_package(battery, buffer->pointer,
476 extended_info_offsets,
477 ARRAY_SIZE(extended_info_offsets));
478 else
479 result = extract_package(battery, buffer->pointer,
480 info_offsets, ARRAY_SIZE(info_offsets));
481 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
482 battery->full_charge_capacity = battery->design_capacity;
483 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
484 battery->power_unit && battery->design_voltage) {
485 battery->design_capacity = battery->design_capacity *
486 10000 / battery->design_voltage;
487 battery->full_charge_capacity = battery->full_charge_capacity *
488 10000 / battery->design_voltage;
489 battery->design_capacity_warning =
490 battery->design_capacity_warning *
491 10000 / battery->design_voltage;
492 /* Curiously, design_capacity_low, unlike the rest of them,
493 is correct. */
494 /* capacity_granularity_* equal 1 on the systems tested, so
495 it's impossible to tell if they would need an adjustment
496 or not if their values were higher. */
497 }
498 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
499 battery->capacity_now > battery->full_charge_capacity)
500 battery->capacity_now = battery->full_charge_capacity;
501
502 return result;
503}
504
505static int acpi_battery_get_info(struct acpi_battery *battery)
506{
507 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
508 int use_bix;
509 int result = -ENODEV;
510
511 if (!acpi_battery_present(battery))
512 return 0;
513
514
515 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
516 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
517 acpi_status status = AE_ERROR;
518
519 mutex_lock(&battery->lock);
520 status = acpi_evaluate_object(battery->device->handle,
521 use_bix ? "_BIX":"_BIF",
522 NULL, &buffer);
523 mutex_unlock(&battery->lock);
524
525 if (ACPI_FAILURE(status)) {
526 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s",
527 use_bix ? "_BIX":"_BIF"));
528 } else {
529 result = extract_battery_info(use_bix,
530 battery,
531 &buffer);
532
533 kfree(buffer.pointer);
534 break;
535 }
536 }
537
538 if (!result && !use_bix && xinfo)
539 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
540
541 return result;
542}
543
544static int acpi_battery_get_state(struct acpi_battery *battery)
545{
546 int result = 0;
547 acpi_status status = 0;
548 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
549
550 if (!acpi_battery_present(battery))
551 return 0;
552
553 if (battery->update_time &&
554 time_before(jiffies, battery->update_time +
555 msecs_to_jiffies(cache_time)))
556 return 0;
557
558 mutex_lock(&battery->lock);
559 status = acpi_evaluate_object(battery->device->handle, "_BST",
560 NULL, &buffer);
561 mutex_unlock(&battery->lock);
562
563 if (ACPI_FAILURE(status)) {
564 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
565 return -ENODEV;
566 }
567
568 result = extract_package(battery, buffer.pointer,
569 state_offsets, ARRAY_SIZE(state_offsets));
570 battery->update_time = jiffies;
571 kfree(buffer.pointer);
572
573 /* For buggy DSDTs that report negative 16-bit values for either
574 * charging or discharging current and/or report 0 as 65536
575 * due to bad math.
576 */
577 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
578 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
579 (s16)(battery->rate_now) < 0) {
580 battery->rate_now = abs((s16)battery->rate_now);
581 pr_warn_once(FW_BUG "battery: (dis)charge rate invalid.\n");
582 }
583
584 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
585 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
586 battery->capacity_now = (battery->capacity_now *
587 battery->full_charge_capacity) / 100;
588 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
589 battery->power_unit && battery->design_voltage) {
590 battery->capacity_now = battery->capacity_now *
591 10000 / battery->design_voltage;
592 }
593 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
594 battery->capacity_now > battery->full_charge_capacity)
595 battery->capacity_now = battery->full_charge_capacity;
596
597 return result;
598}
599
600static int acpi_battery_set_alarm(struct acpi_battery *battery)
601{
602 acpi_status status = 0;
603
604 if (!acpi_battery_present(battery) ||
605 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
606 return -ENODEV;
607
608 mutex_lock(&battery->lock);
609 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
610 battery->alarm);
611 mutex_unlock(&battery->lock);
612
613 if (ACPI_FAILURE(status))
614 return -ENODEV;
615
616 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
617 return 0;
618}
619
620static int acpi_battery_init_alarm(struct acpi_battery *battery)
621{
622 /* See if alarms are supported, and if so, set default */
623 if (!acpi_has_method(battery->device->handle, "_BTP")) {
624 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
625 return 0;
626 }
627 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
628 if (!battery->alarm)
629 battery->alarm = battery->design_capacity_warning;
630 return acpi_battery_set_alarm(battery);
631}
632
633static ssize_t acpi_battery_alarm_show(struct device *dev,
634 struct device_attribute *attr,
635 char *buf)
636{
637 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
638 return sprintf(buf, "%d\n", battery->alarm * 1000);
639}
640
641static ssize_t acpi_battery_alarm_store(struct device *dev,
642 struct device_attribute *attr,
643 const char *buf, size_t count)
644{
645 unsigned long x;
646 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
647 if (sscanf(buf, "%lu\n", &x) == 1)
648 battery->alarm = x/1000;
649 if (acpi_battery_present(battery))
650 acpi_battery_set_alarm(battery);
651 return count;
652}
653
654static const struct device_attribute alarm_attr = {
655 .attr = {.name = "alarm", .mode = 0644},
656 .show = acpi_battery_alarm_show,
657 .store = acpi_battery_alarm_store,
658};
659
660/*
661 * The Battery Hooking API
662 *
663 * This API is used inside other drivers that need to expose
664 * platform-specific behaviour within the generic driver in a
665 * generic way.
666 *
667 */
668
669static LIST_HEAD(acpi_battery_list);
670static LIST_HEAD(battery_hook_list);
671static DEFINE_MUTEX(hook_mutex);
672
673static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
674{
675 struct acpi_battery *battery;
676 /*
677 * In order to remove a hook, we first need to
678 * de-register all the batteries that are registered.
679 */
680 if (lock)
681 mutex_lock(&hook_mutex);
682 list_for_each_entry(battery, &acpi_battery_list, list) {
683 hook->remove_battery(battery->bat);
684 }
685 list_del(&hook->list);
686 if (lock)
687 mutex_unlock(&hook_mutex);
688 pr_info("extension unregistered: %s\n", hook->name);
689}
690
691void battery_hook_unregister(struct acpi_battery_hook *hook)
692{
693 __battery_hook_unregister(hook, 1);
694}
695EXPORT_SYMBOL_GPL(battery_hook_unregister);
696
697void battery_hook_register(struct acpi_battery_hook *hook)
698{
699 struct acpi_battery *battery;
700
701 mutex_lock(&hook_mutex);
702 INIT_LIST_HEAD(&hook->list);
703 list_add(&hook->list, &battery_hook_list);
704 /*
705 * Now that the driver is registered, we need
706 * to notify the hook that a battery is available
707 * for each battery, so that the driver may add
708 * its attributes.
709 */
710 list_for_each_entry(battery, &acpi_battery_list, list) {
711 if (hook->add_battery(battery->bat)) {
712 /*
713 * If a add-battery returns non-zero,
714 * the registration of the extension has failed,
715 * and we will not add it to the list of loaded
716 * hooks.
717 */
718 pr_err("extension failed to load: %s", hook->name);
719 __battery_hook_unregister(hook, 0);
720 goto end;
721 }
722 }
723 pr_info("new extension: %s\n", hook->name);
724end:
725 mutex_unlock(&hook_mutex);
726}
727EXPORT_SYMBOL_GPL(battery_hook_register);
728
729/*
730 * This function gets called right after the battery sysfs
731 * attributes have been added, so that the drivers that
732 * define custom sysfs attributes can add their own.
733*/
734static void battery_hook_add_battery(struct acpi_battery *battery)
735{
736 struct acpi_battery_hook *hook_node, *tmp;
737
738 mutex_lock(&hook_mutex);
739 INIT_LIST_HEAD(&battery->list);
740 list_add(&battery->list, &acpi_battery_list);
741 /*
742 * Since we added a new battery to the list, we need to
743 * iterate over the hooks and call add_battery for each
744 * hook that was registered. This usually happens
745 * when a battery gets hotplugged or initialized
746 * during the battery module initialization.
747 */
748 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
749 if (hook_node->add_battery(battery->bat)) {
750 /*
751 * The notification of the extensions has failed, to
752 * prevent further errors we will unload the extension.
753 */
754 pr_err("error in extension, unloading: %s",
755 hook_node->name);
756 __battery_hook_unregister(hook_node, 0);
757 }
758 }
759 mutex_unlock(&hook_mutex);
760}
761
762static void battery_hook_remove_battery(struct acpi_battery *battery)
763{
764 struct acpi_battery_hook *hook;
765
766 mutex_lock(&hook_mutex);
767 /*
768 * Before removing the hook, we need to remove all
769 * custom attributes from the battery.
770 */
771 list_for_each_entry(hook, &battery_hook_list, list) {
772 hook->remove_battery(battery->bat);
773 }
774 /* Then, just remove the battery from the list */
775 list_del(&battery->list);
776 mutex_unlock(&hook_mutex);
777}
778
779static void __exit battery_hook_exit(void)
780{
781 struct acpi_battery_hook *hook;
782 struct acpi_battery_hook *ptr;
783 /*
784 * At this point, the acpi_bus_unregister_driver()
785 * has called remove for all batteries. We just
786 * need to remove the hooks.
787 */
788 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
789 __battery_hook_unregister(hook, 1);
790 }
791 mutex_destroy(&hook_mutex);
792}
793
794static int sysfs_add_battery(struct acpi_battery *battery)
795{
796 struct power_supply_config psy_cfg = { .drv_data = battery, };
797
798 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
799 battery->bat_desc.properties = charge_battery_props;
800 battery->bat_desc.num_properties =
801 ARRAY_SIZE(charge_battery_props);
802 } else if (battery->full_charge_capacity == 0) {
803 battery->bat_desc.properties =
804 energy_battery_full_cap_broken_props;
805 battery->bat_desc.num_properties =
806 ARRAY_SIZE(energy_battery_full_cap_broken_props);
807 } else {
808 battery->bat_desc.properties = energy_battery_props;
809 battery->bat_desc.num_properties =
810 ARRAY_SIZE(energy_battery_props);
811 }
812
813 battery->bat_desc.name = acpi_device_bid(battery->device);
814 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
815 battery->bat_desc.get_property = acpi_battery_get_property;
816
817 battery->bat = power_supply_register_no_ws(&battery->device->dev,
818 &battery->bat_desc, &psy_cfg);
819
820 if (IS_ERR(battery->bat)) {
821 int result = PTR_ERR(battery->bat);
822
823 battery->bat = NULL;
824 return result;
825 }
826 battery_hook_add_battery(battery);
827 return device_create_file(&battery->bat->dev, &alarm_attr);
828}
829
830static void sysfs_remove_battery(struct acpi_battery *battery)
831{
832 mutex_lock(&battery->sysfs_lock);
833 if (!battery->bat) {
834 mutex_unlock(&battery->sysfs_lock);
835 return;
836 }
837 battery_hook_remove_battery(battery);
838 device_remove_file(&battery->bat->dev, &alarm_attr);
839 power_supply_unregister(battery->bat);
840 battery->bat = NULL;
841 mutex_unlock(&battery->sysfs_lock);
842}
843
844static void find_battery(const struct dmi_header *dm, void *private)
845{
846 struct acpi_battery *battery = (struct acpi_battery *)private;
847 /* Note: the hardcoded offsets below have been extracted from
848 the source code of dmidecode. */
849 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
850 const u8 *dmi_data = (const u8 *)(dm + 1);
851 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
852 if (dm->length >= 18)
853 dmi_capacity *= dmi_data[17];
854 if (battery->design_capacity * battery->design_voltage / 1000
855 != dmi_capacity &&
856 battery->design_capacity * 10 == dmi_capacity)
857 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
858 &battery->flags);
859 }
860}
861
862/*
863 * According to the ACPI spec, some kinds of primary batteries can
864 * report percentage battery remaining capacity directly to OS.
865 * In this case, it reports the Last Full Charged Capacity == 100
866 * and BatteryPresentRate == 0xFFFFFFFF.
867 *
868 * Now we found some battery reports percentage remaining capacity
869 * even if it's rechargeable.
870 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
871 *
872 * Handle this correctly so that they won't break userspace.
873 */
874static void acpi_battery_quirks(struct acpi_battery *battery)
875{
876 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
877 return;
878
879 if (battery->full_charge_capacity == 100 &&
880 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
881 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
882 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
883 battery->full_charge_capacity = battery->design_capacity;
884 battery->capacity_now = (battery->capacity_now *
885 battery->full_charge_capacity) / 100;
886 }
887
888 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
889 return;
890
891 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
892 const char *s;
893 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
894 if (s && !strncasecmp(s, "ThinkPad", 8)) {
895 dmi_walk(find_battery, battery);
896 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
897 &battery->flags) &&
898 battery->design_voltage) {
899 battery->design_capacity =
900 battery->design_capacity *
901 10000 / battery->design_voltage;
902 battery->full_charge_capacity =
903 battery->full_charge_capacity *
904 10000 / battery->design_voltage;
905 battery->design_capacity_warning =
906 battery->design_capacity_warning *
907 10000 / battery->design_voltage;
908 battery->capacity_now = battery->capacity_now *
909 10000 / battery->design_voltage;
910 }
911 }
912 }
913
914 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
915 return;
916
917 if (acpi_battery_is_degraded(battery) &&
918 battery->capacity_now > battery->full_charge_capacity) {
919 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
920 battery->capacity_now = battery->full_charge_capacity;
921 }
922}
923
924static int acpi_battery_update(struct acpi_battery *battery, bool resume)
925{
926 int result = acpi_battery_get_status(battery);
927
928 if (result)
929 return result;
930
931 if (!acpi_battery_present(battery)) {
932 sysfs_remove_battery(battery);
933 battery->update_time = 0;
934 return 0;
935 }
936
937 if (resume)
938 return 0;
939
940 if (!battery->update_time) {
941 result = acpi_battery_get_info(battery);
942 if (result)
943 return result;
944 acpi_battery_init_alarm(battery);
945 }
946
947 result = acpi_battery_get_state(battery);
948 if (result)
949 return result;
950 acpi_battery_quirks(battery);
951
952 if (!battery->bat) {
953 result = sysfs_add_battery(battery);
954 if (result)
955 return result;
956 }
957
958 /*
959 * Wakeup the system if battery is critical low
960 * or lower than the alarm level
961 */
962 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
963 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
964 (battery->capacity_now <= battery->alarm)))
965 acpi_pm_wakeup_event(&battery->device->dev);
966
967 return result;
968}
969
970static void acpi_battery_refresh(struct acpi_battery *battery)
971{
972 int power_unit;
973
974 if (!battery->bat)
975 return;
976
977 power_unit = battery->power_unit;
978
979 acpi_battery_get_info(battery);
980
981 if (power_unit == battery->power_unit)
982 return;
983
984 /* The battery has changed its reporting units. */
985 sysfs_remove_battery(battery);
986 sysfs_add_battery(battery);
987}
988
989/* --------------------------------------------------------------------------
990 FS Interface (/proc)
991 -------------------------------------------------------------------------- */
992
993#ifdef CONFIG_ACPI_PROCFS_POWER
994static struct proc_dir_entry *acpi_battery_dir;
995
996static const char *acpi_battery_units(const struct acpi_battery *battery)
997{
998 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
999 "mA" : "mW";
1000}
1001
1002static int acpi_battery_info_proc_show(struct seq_file *seq, void *offset)
1003{
1004 struct acpi_battery *battery = seq->private;
1005 int result = acpi_battery_update(battery, false);
1006
1007 if (result)
1008 goto end;
1009
1010 seq_printf(seq, "present: %s\n",
1011 acpi_battery_present(battery) ? "yes" : "no");
1012 if (!acpi_battery_present(battery))
1013 goto end;
1014 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
1015 seq_printf(seq, "design capacity: unknown\n");
1016 else
1017 seq_printf(seq, "design capacity: %d %sh\n",
1018 battery->design_capacity,
1019 acpi_battery_units(battery));
1020
1021 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
1022 seq_printf(seq, "last full capacity: unknown\n");
1023 else
1024 seq_printf(seq, "last full capacity: %d %sh\n",
1025 battery->full_charge_capacity,
1026 acpi_battery_units(battery));
1027
1028 seq_printf(seq, "battery technology: %srechargeable\n",
1029 battery->technology ? "" : "non-");
1030
1031 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
1032 seq_printf(seq, "design voltage: unknown\n");
1033 else
1034 seq_printf(seq, "design voltage: %d mV\n",
1035 battery->design_voltage);
1036 seq_printf(seq, "design capacity warning: %d %sh\n",
1037 battery->design_capacity_warning,
1038 acpi_battery_units(battery));
1039 seq_printf(seq, "design capacity low: %d %sh\n",
1040 battery->design_capacity_low,
1041 acpi_battery_units(battery));
1042 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
1043 seq_printf(seq, "capacity granularity 1: %d %sh\n",
1044 battery->capacity_granularity_1,
1045 acpi_battery_units(battery));
1046 seq_printf(seq, "capacity granularity 2: %d %sh\n",
1047 battery->capacity_granularity_2,
1048 acpi_battery_units(battery));
1049 seq_printf(seq, "model number: %s\n", battery->model_number);
1050 seq_printf(seq, "serial number: %s\n", battery->serial_number);
1051 seq_printf(seq, "battery type: %s\n", battery->type);
1052 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
1053 end:
1054 if (result)
1055 seq_printf(seq, "ERROR: Unable to read battery info\n");
1056 return result;
1057}
1058
1059static int acpi_battery_state_proc_show(struct seq_file *seq, void *offset)
1060{
1061 struct acpi_battery *battery = seq->private;
1062 int result = acpi_battery_update(battery, false);
1063
1064 if (result)
1065 goto end;
1066
1067 seq_printf(seq, "present: %s\n",
1068 acpi_battery_present(battery) ? "yes" : "no");
1069 if (!acpi_battery_present(battery))
1070 goto end;
1071
1072 seq_printf(seq, "capacity state: %s\n",
1073 (battery->state & 0x04) ? "critical" : "ok");
1074 if ((battery->state & 0x01) && (battery->state & 0x02))
1075 seq_printf(seq,
1076 "charging state: charging/discharging\n");
1077 else if (battery->state & 0x01)
1078 seq_printf(seq, "charging state: discharging\n");
1079 else if (battery->state & 0x02)
1080 seq_printf(seq, "charging state: charging\n");
1081 else
1082 seq_printf(seq, "charging state: charged\n");
1083
1084 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
1085 seq_printf(seq, "present rate: unknown\n");
1086 else
1087 seq_printf(seq, "present rate: %d %s\n",
1088 battery->rate_now, acpi_battery_units(battery));
1089
1090 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
1091 seq_printf(seq, "remaining capacity: unknown\n");
1092 else
1093 seq_printf(seq, "remaining capacity: %d %sh\n",
1094 battery->capacity_now, acpi_battery_units(battery));
1095 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
1096 seq_printf(seq, "present voltage: unknown\n");
1097 else
1098 seq_printf(seq, "present voltage: %d mV\n",
1099 battery->voltage_now);
1100 end:
1101 if (result)
1102 seq_printf(seq, "ERROR: Unable to read battery state\n");
1103
1104 return result;
1105}
1106
1107static int acpi_battery_alarm_proc_show(struct seq_file *seq, void *offset)
1108{
1109 struct acpi_battery *battery = seq->private;
1110 int result = acpi_battery_update(battery, false);
1111
1112 if (result)
1113 goto end;
1114
1115 if (!acpi_battery_present(battery)) {
1116 seq_printf(seq, "present: no\n");
1117 goto end;
1118 }
1119 seq_printf(seq, "alarm: ");
1120 if (battery->alarm) {
1121 seq_printf(seq, "%u %sh\n", battery->alarm,
1122 acpi_battery_units(battery));
1123 } else {
1124 seq_printf(seq, "unsupported\n");
1125 }
1126 end:
1127 if (result)
1128 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
1129 return result;
1130}
1131
1132static ssize_t acpi_battery_write_alarm(struct file *file,
1133 const char __user * buffer,
1134 size_t count, loff_t * ppos)
1135{
1136 int result = 0;
1137 char alarm_string[12] = { '\0' };
1138 struct seq_file *m = file->private_data;
1139 struct acpi_battery *battery = m->private;
1140
1141 if (!battery || (count > sizeof(alarm_string) - 1))
1142 return -EINVAL;
1143 if (!acpi_battery_present(battery)) {
1144 result = -ENODEV;
1145 goto end;
1146 }
1147 if (copy_from_user(alarm_string, buffer, count)) {
1148 result = -EFAULT;
1149 goto end;
1150 }
1151 alarm_string[count] = '\0';
1152 if (kstrtoint(alarm_string, 0, &battery->alarm)) {
1153 result = -EINVAL;
1154 goto end;
1155 }
1156 result = acpi_battery_set_alarm(battery);
1157 end:
1158 if (result)
1159 return result;
1160 return count;
1161}
1162
1163static int acpi_battery_alarm_proc_open(struct inode *inode, struct file *file)
1164{
1165 return single_open(file, acpi_battery_alarm_proc_show, PDE_DATA(inode));
1166}
1167
1168static const struct file_operations acpi_battery_alarm_fops = {
1169 .owner = THIS_MODULE,
1170 .open = acpi_battery_alarm_proc_open,
1171 .read = seq_read,
1172 .write = acpi_battery_write_alarm,
1173 .llseek = seq_lseek,
1174 .release = single_release,
1175};
1176
1177static int acpi_battery_add_fs(struct acpi_device *device)
1178{
1179 pr_warning(PREFIX "Deprecated procfs I/F for battery is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
1180 if (!acpi_device_dir(device)) {
1181 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1182 acpi_battery_dir);
1183 if (!acpi_device_dir(device))
1184 return -ENODEV;
1185 }
1186
1187 if (!proc_create_single_data("info", S_IRUGO, acpi_device_dir(device),
1188 acpi_battery_info_proc_show, acpi_driver_data(device)))
1189 return -ENODEV;
1190 if (!proc_create_single_data("state", S_IRUGO, acpi_device_dir(device),
1191 acpi_battery_state_proc_show, acpi_driver_data(device)))
1192 return -ENODEV;
1193 if (!proc_create_data("alarm", S_IFREG | S_IRUGO | S_IWUSR,
1194 acpi_device_dir(device), &acpi_battery_alarm_fops,
1195 acpi_driver_data(device)))
1196 return -ENODEV;
1197 return 0;
1198}
1199
1200static void acpi_battery_remove_fs(struct acpi_device *device)
1201{
1202 if (!acpi_device_dir(device))
1203 return;
1204 remove_proc_subtree(acpi_device_bid(device), acpi_battery_dir);
1205 acpi_device_dir(device) = NULL;
1206}
1207
1208#endif
1209
1210/* --------------------------------------------------------------------------
1211 Driver Interface
1212 -------------------------------------------------------------------------- */
1213
1214static void acpi_battery_notify(struct acpi_device *device, u32 event)
1215{
1216 struct acpi_battery *battery = acpi_driver_data(device);
1217 struct power_supply *old;
1218
1219 if (!battery)
1220 return;
1221 old = battery->bat;
1222 /*
1223 * On Acer Aspire V5-573G notifications are sometimes triggered too
1224 * early. For example, when AC is unplugged and notification is
1225 * triggered, battery state is still reported as "Full", and changes to
1226 * "Discharging" only after short delay, without any notification.
1227 */
1228 if (battery_notification_delay_ms > 0)
1229 msleep(battery_notification_delay_ms);
1230 if (event == ACPI_BATTERY_NOTIFY_INFO)
1231 acpi_battery_refresh(battery);
1232 acpi_battery_update(battery, false);
1233 acpi_bus_generate_netlink_event(device->pnp.device_class,
1234 dev_name(&device->dev), event,
1235 acpi_battery_present(battery));
1236 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1237 /* acpi_battery_update could remove power_supply object */
1238 if (old && battery->bat)
1239 power_supply_changed(battery->bat);
1240}
1241
1242static int battery_notify(struct notifier_block *nb,
1243 unsigned long mode, void *_unused)
1244{
1245 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1246 pm_nb);
1247 int result;
1248
1249 switch (mode) {
1250 case PM_POST_HIBERNATION:
1251 case PM_POST_SUSPEND:
1252 if (!acpi_battery_present(battery))
1253 return 0;
1254
1255 if (battery->bat) {
1256 acpi_battery_refresh(battery);
1257 } else {
1258 result = acpi_battery_get_info(battery);
1259 if (result)
1260 return result;
1261
1262 result = sysfs_add_battery(battery);
1263 if (result)
1264 return result;
1265 }
1266
1267 acpi_battery_init_alarm(battery);
1268 acpi_battery_get_state(battery);
1269 break;
1270 }
1271
1272 return 0;
1273}
1274
1275static int __init
1276battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1277{
1278 battery_bix_broken_package = 1;
1279 return 0;
1280}
1281
1282static int __init
1283battery_notification_delay_quirk(const struct dmi_system_id *d)
1284{
1285 battery_notification_delay_ms = 1000;
1286 return 0;
1287}
1288
1289static int __init
1290battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1291{
1292 battery_ac_is_broken = 1;
1293 return 0;
1294}
1295
1296static int __init
1297battery_do_not_check_pmic_quirk(const struct dmi_system_id *d)
1298{
1299 battery_check_pmic = 0;
1300 return 0;
1301}
1302
1303static const struct dmi_system_id bat_dmi_table[] __initconst = {
1304 {
1305 /* NEC LZ750/LS */
1306 .callback = battery_bix_broken_package_quirk,
1307 .matches = {
1308 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1309 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1310 },
1311 },
1312 {
1313 /* Acer Aspire V5-573G */
1314 .callback = battery_notification_delay_quirk,
1315 .matches = {
1316 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1317 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1318 },
1319 },
1320 {
1321 /* Point of View mobii wintab p800w */
1322 .callback = battery_ac_is_broken_quirk,
1323 .matches = {
1324 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1325 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1326 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1327 /* Above matches are too generic, add bios-date match */
1328 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1329 },
1330 },
1331 {
1332 /* ECS EF20EA */
1333 .callback = battery_do_not_check_pmic_quirk,
1334 .matches = {
1335 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
1336 },
1337 },
1338 {
1339 /* Lenovo Ideapad Miix 320 */
1340 .callback = battery_do_not_check_pmic_quirk,
1341 .matches = {
1342 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1343 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80XF"),
1344 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
1345 },
1346 },
1347 {},
1348};
1349
1350/*
1351 * Some machines'(E,G Lenovo Z480) ECs are not stable
1352 * during boot up and this causes battery driver fails to be
1353 * probed due to failure of getting battery information
1354 * from EC sometimes. After several retries, the operation
1355 * may work. So add retry code here and 20ms sleep between
1356 * every retries.
1357 */
1358static int acpi_battery_update_retry(struct acpi_battery *battery)
1359{
1360 int retry, ret;
1361
1362 for (retry = 5; retry; retry--) {
1363 ret = acpi_battery_update(battery, false);
1364 if (!ret)
1365 break;
1366
1367 msleep(20);
1368 }
1369 return ret;
1370}
1371
1372static int acpi_battery_add(struct acpi_device *device)
1373{
1374 int result = 0;
1375 struct acpi_battery *battery = NULL;
1376
1377 if (!device)
1378 return -EINVAL;
1379
1380 if (device->dep_unmet)
1381 return -EPROBE_DEFER;
1382
1383 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1384 if (!battery)
1385 return -ENOMEM;
1386 battery->device = device;
1387 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1388 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1389 device->driver_data = battery;
1390 mutex_init(&battery->lock);
1391 mutex_init(&battery->sysfs_lock);
1392 if (acpi_has_method(battery->device->handle, "_BIX"))
1393 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1394
1395 result = acpi_battery_update_retry(battery);
1396 if (result)
1397 goto fail;
1398
1399#ifdef CONFIG_ACPI_PROCFS_POWER
1400 result = acpi_battery_add_fs(device);
1401 if (result) {
1402 acpi_battery_remove_fs(device);
1403 goto fail;
1404 }
1405#endif
1406
1407 pr_info(PREFIX "%s Slot [%s] (battery %s)\n",
1408 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1409 device->status.battery_present ? "present" : "absent");
1410
1411 battery->pm_nb.notifier_call = battery_notify;
1412 register_pm_notifier(&battery->pm_nb);
1413
1414 device_init_wakeup(&device->dev, 1);
1415
1416 return result;
1417
1418fail:
1419 sysfs_remove_battery(battery);
1420 mutex_destroy(&battery->lock);
1421 mutex_destroy(&battery->sysfs_lock);
1422 kfree(battery);
1423 return result;
1424}
1425
1426static int acpi_battery_remove(struct acpi_device *device)
1427{
1428 struct acpi_battery *battery = NULL;
1429
1430 if (!device || !acpi_driver_data(device))
1431 return -EINVAL;
1432 device_init_wakeup(&device->dev, 0);
1433 battery = acpi_driver_data(device);
1434 unregister_pm_notifier(&battery->pm_nb);
1435#ifdef CONFIG_ACPI_PROCFS_POWER
1436 acpi_battery_remove_fs(device);
1437#endif
1438 sysfs_remove_battery(battery);
1439 mutex_destroy(&battery->lock);
1440 mutex_destroy(&battery->sysfs_lock);
1441 kfree(battery);
1442 return 0;
1443}
1444
1445#ifdef CONFIG_PM_SLEEP
1446/* this is needed to learn about changes made in suspended state */
1447static int acpi_battery_resume(struct device *dev)
1448{
1449 struct acpi_battery *battery;
1450
1451 if (!dev)
1452 return -EINVAL;
1453
1454 battery = acpi_driver_data(to_acpi_device(dev));
1455 if (!battery)
1456 return -EINVAL;
1457
1458 battery->update_time = 0;
1459 acpi_battery_update(battery, true);
1460 return 0;
1461}
1462#else
1463#define acpi_battery_resume NULL
1464#endif
1465
1466static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1467
1468static struct acpi_driver acpi_battery_driver = {
1469 .name = "battery",
1470 .class = ACPI_BATTERY_CLASS,
1471 .ids = battery_device_ids,
1472 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1473 .ops = {
1474 .add = acpi_battery_add,
1475 .remove = acpi_battery_remove,
1476 .notify = acpi_battery_notify,
1477 },
1478 .drv.pm = &acpi_battery_pm,
1479};
1480
1481static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1482{
1483 unsigned int i;
1484 int result;
1485
1486 dmi_check_system(bat_dmi_table);
1487
1488 if (battery_check_pmic) {
1489 for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
1490 if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
1491 pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME
1492 ": found native %s PMIC, not loading\n",
1493 acpi_battery_blacklist[i]);
1494 return;
1495 }
1496 }
1497
1498#ifdef CONFIG_ACPI_PROCFS_POWER
1499 acpi_battery_dir = acpi_lock_battery_dir();
1500 if (!acpi_battery_dir)
1501 return;
1502#endif
1503 result = acpi_bus_register_driver(&acpi_battery_driver);
1504#ifdef CONFIG_ACPI_PROCFS_POWER
1505 if (result < 0)
1506 acpi_unlock_battery_dir(acpi_battery_dir);
1507#endif
1508 battery_driver_registered = (result == 0);
1509}
1510
1511static int __init acpi_battery_init(void)
1512{
1513 if (acpi_disabled)
1514 return -ENODEV;
1515
1516 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1517 return 0;
1518}
1519
1520static void __exit acpi_battery_exit(void)
1521{
1522 async_synchronize_cookie(async_cookie + 1);
1523 if (battery_driver_registered) {
1524 acpi_bus_unregister_driver(&acpi_battery_driver);
1525 battery_hook_exit();
1526 }
1527#ifdef CONFIG_ACPI_PROCFS_POWER
1528 if (acpi_battery_dir)
1529 acpi_unlock_battery_dir(acpi_battery_dir);
1530#endif
1531}
1532
1533module_init(acpi_battery_init);
1534module_exit(acpi_battery_exit);