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