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1/*
2 * battery.c - ACPI Battery Driver (Revision: 2.0)
3 *
4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 *
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 */
27
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/types.h>
32#include <linux/jiffies.h>
33#include <linux/async.h>
34#include <linux/dmi.h>
35#include <linux/slab.h>
36#include <linux/suspend.h>
37
38#ifdef CONFIG_ACPI_PROCFS_POWER
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41#include <asm/uaccess.h>
42#endif
43
44#include <acpi/acpi_bus.h>
45#include <acpi/acpi_drivers.h>
46#include <linux/power_supply.h>
47
48#define PREFIX "ACPI: "
49
50#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
51
52#define ACPI_BATTERY_CLASS "battery"
53#define ACPI_BATTERY_DEVICE_NAME "Battery"
54#define ACPI_BATTERY_NOTIFY_STATUS 0x80
55#define ACPI_BATTERY_NOTIFY_INFO 0x81
56#define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
57
58/* Battery power unit: 0 means mW, 1 means mA */
59#define ACPI_BATTERY_POWER_UNIT_MA 1
60
61#define _COMPONENT ACPI_BATTERY_COMPONENT
62
63ACPI_MODULE_NAME("battery");
64
65MODULE_AUTHOR("Paul Diefenbaugh");
66MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
67MODULE_DESCRIPTION("ACPI Battery Driver");
68MODULE_LICENSE("GPL");
69
70static unsigned int cache_time = 1000;
71module_param(cache_time, uint, 0644);
72MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
73
74#ifdef CONFIG_ACPI_PROCFS_POWER
75extern struct proc_dir_entry *acpi_lock_battery_dir(void);
76extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
77
78enum acpi_battery_files {
79 info_tag = 0,
80 state_tag,
81 alarm_tag,
82 ACPI_BATTERY_NUMFILES,
83};
84
85#endif
86
87static const struct acpi_device_id battery_device_ids[] = {
88 {"PNP0C0A", 0},
89 {"", 0},
90};
91
92MODULE_DEVICE_TABLE(acpi, battery_device_ids);
93
94enum {
95 ACPI_BATTERY_ALARM_PRESENT,
96 ACPI_BATTERY_XINFO_PRESENT,
97 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
98};
99
100struct acpi_battery {
101 struct mutex lock;
102 struct mutex sysfs_lock;
103 struct power_supply bat;
104 struct acpi_device *device;
105 struct notifier_block pm_nb;
106 unsigned long update_time;
107 int rate_now;
108 int capacity_now;
109 int voltage_now;
110 int design_capacity;
111 int full_charge_capacity;
112 int technology;
113 int design_voltage;
114 int design_capacity_warning;
115 int design_capacity_low;
116 int cycle_count;
117 int measurement_accuracy;
118 int max_sampling_time;
119 int min_sampling_time;
120 int max_averaging_interval;
121 int min_averaging_interval;
122 int capacity_granularity_1;
123 int capacity_granularity_2;
124 int alarm;
125 char model_number[32];
126 char serial_number[32];
127 char type[32];
128 char oem_info[32];
129 int state;
130 int power_unit;
131 unsigned long flags;
132};
133
134#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
135
136inline int acpi_battery_present(struct acpi_battery *battery)
137{
138 return battery->device->status.battery_present;
139}
140
141static int acpi_battery_technology(struct acpi_battery *battery)
142{
143 if (!strcasecmp("NiCd", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_NiCd;
145 if (!strcasecmp("NiMH", battery->type))
146 return POWER_SUPPLY_TECHNOLOGY_NiMH;
147 if (!strcasecmp("LION", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_LION;
149 if (!strncasecmp("LI-ION", battery->type, 6))
150 return POWER_SUPPLY_TECHNOLOGY_LION;
151 if (!strcasecmp("LiP", battery->type))
152 return POWER_SUPPLY_TECHNOLOGY_LIPO;
153 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
154}
155
156static int acpi_battery_get_state(struct acpi_battery *battery);
157
158static int acpi_battery_is_charged(struct acpi_battery *battery)
159{
160 /* either charging or discharging */
161 if (battery->state != 0)
162 return 0;
163
164 /* battery not reporting charge */
165 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
166 battery->capacity_now == 0)
167 return 0;
168
169 /* good batteries update full_charge as the batteries degrade */
170 if (battery->full_charge_capacity == battery->capacity_now)
171 return 1;
172
173 /* fallback to using design values for broken batteries */
174 if (battery->design_capacity == battery->capacity_now)
175 return 1;
176
177 /* we don't do any sort of metric based on percentages */
178 return 0;
179}
180
181static int acpi_battery_get_property(struct power_supply *psy,
182 enum power_supply_property psp,
183 union power_supply_propval *val)
184{
185 int ret = 0;
186 struct acpi_battery *battery = to_acpi_battery(psy);
187
188 if (acpi_battery_present(battery)) {
189 /* run battery update only if it is present */
190 acpi_battery_get_state(battery);
191 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
192 return -ENODEV;
193 switch (psp) {
194 case POWER_SUPPLY_PROP_STATUS:
195 if (battery->state & 0x01)
196 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
197 else if (battery->state & 0x02)
198 val->intval = POWER_SUPPLY_STATUS_CHARGING;
199 else if (acpi_battery_is_charged(battery))
200 val->intval = POWER_SUPPLY_STATUS_FULL;
201 else
202 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
203 break;
204 case POWER_SUPPLY_PROP_PRESENT:
205 val->intval = acpi_battery_present(battery);
206 break;
207 case POWER_SUPPLY_PROP_TECHNOLOGY:
208 val->intval = acpi_battery_technology(battery);
209 break;
210 case POWER_SUPPLY_PROP_CYCLE_COUNT:
211 val->intval = battery->cycle_count;
212 break;
213 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
214 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
215 ret = -ENODEV;
216 else
217 val->intval = battery->design_voltage * 1000;
218 break;
219 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
220 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
221 ret = -ENODEV;
222 else
223 val->intval = battery->voltage_now * 1000;
224 break;
225 case POWER_SUPPLY_PROP_CURRENT_NOW:
226 case POWER_SUPPLY_PROP_POWER_NOW:
227 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
228 ret = -ENODEV;
229 else
230 val->intval = battery->rate_now * 1000;
231 break;
232 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
233 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
234 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
235 ret = -ENODEV;
236 else
237 val->intval = battery->design_capacity * 1000;
238 break;
239 case POWER_SUPPLY_PROP_CHARGE_FULL:
240 case POWER_SUPPLY_PROP_ENERGY_FULL:
241 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
242 ret = -ENODEV;
243 else
244 val->intval = battery->full_charge_capacity * 1000;
245 break;
246 case POWER_SUPPLY_PROP_CHARGE_NOW:
247 case POWER_SUPPLY_PROP_ENERGY_NOW:
248 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
249 ret = -ENODEV;
250 else
251 val->intval = battery->capacity_now * 1000;
252 break;
253 case POWER_SUPPLY_PROP_MODEL_NAME:
254 val->strval = battery->model_number;
255 break;
256 case POWER_SUPPLY_PROP_MANUFACTURER:
257 val->strval = battery->oem_info;
258 break;
259 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
260 val->strval = battery->serial_number;
261 break;
262 default:
263 ret = -EINVAL;
264 }
265 return ret;
266}
267
268static enum power_supply_property charge_battery_props[] = {
269 POWER_SUPPLY_PROP_STATUS,
270 POWER_SUPPLY_PROP_PRESENT,
271 POWER_SUPPLY_PROP_TECHNOLOGY,
272 POWER_SUPPLY_PROP_CYCLE_COUNT,
273 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
274 POWER_SUPPLY_PROP_VOLTAGE_NOW,
275 POWER_SUPPLY_PROP_CURRENT_NOW,
276 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
277 POWER_SUPPLY_PROP_CHARGE_FULL,
278 POWER_SUPPLY_PROP_CHARGE_NOW,
279 POWER_SUPPLY_PROP_MODEL_NAME,
280 POWER_SUPPLY_PROP_MANUFACTURER,
281 POWER_SUPPLY_PROP_SERIAL_NUMBER,
282};
283
284static enum power_supply_property energy_battery_props[] = {
285 POWER_SUPPLY_PROP_STATUS,
286 POWER_SUPPLY_PROP_PRESENT,
287 POWER_SUPPLY_PROP_TECHNOLOGY,
288 POWER_SUPPLY_PROP_CYCLE_COUNT,
289 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
290 POWER_SUPPLY_PROP_VOLTAGE_NOW,
291 POWER_SUPPLY_PROP_POWER_NOW,
292 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
293 POWER_SUPPLY_PROP_ENERGY_FULL,
294 POWER_SUPPLY_PROP_ENERGY_NOW,
295 POWER_SUPPLY_PROP_MODEL_NAME,
296 POWER_SUPPLY_PROP_MANUFACTURER,
297 POWER_SUPPLY_PROP_SERIAL_NUMBER,
298};
299
300#ifdef CONFIG_ACPI_PROCFS_POWER
301inline char *acpi_battery_units(struct acpi_battery *battery)
302{
303 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
304 "mA" : "mW";
305}
306#endif
307
308/* --------------------------------------------------------------------------
309 Battery Management
310 -------------------------------------------------------------------------- */
311struct acpi_offsets {
312 size_t offset; /* offset inside struct acpi_sbs_battery */
313 u8 mode; /* int or string? */
314};
315
316static struct acpi_offsets state_offsets[] = {
317 {offsetof(struct acpi_battery, state), 0},
318 {offsetof(struct acpi_battery, rate_now), 0},
319 {offsetof(struct acpi_battery, capacity_now), 0},
320 {offsetof(struct acpi_battery, voltage_now), 0},
321};
322
323static struct acpi_offsets info_offsets[] = {
324 {offsetof(struct acpi_battery, power_unit), 0},
325 {offsetof(struct acpi_battery, design_capacity), 0},
326 {offsetof(struct acpi_battery, full_charge_capacity), 0},
327 {offsetof(struct acpi_battery, technology), 0},
328 {offsetof(struct acpi_battery, design_voltage), 0},
329 {offsetof(struct acpi_battery, design_capacity_warning), 0},
330 {offsetof(struct acpi_battery, design_capacity_low), 0},
331 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
332 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
333 {offsetof(struct acpi_battery, model_number), 1},
334 {offsetof(struct acpi_battery, serial_number), 1},
335 {offsetof(struct acpi_battery, type), 1},
336 {offsetof(struct acpi_battery, oem_info), 1},
337};
338
339static struct acpi_offsets extended_info_offsets[] = {
340 {offsetof(struct acpi_battery, power_unit), 0},
341 {offsetof(struct acpi_battery, design_capacity), 0},
342 {offsetof(struct acpi_battery, full_charge_capacity), 0},
343 {offsetof(struct acpi_battery, technology), 0},
344 {offsetof(struct acpi_battery, design_voltage), 0},
345 {offsetof(struct acpi_battery, design_capacity_warning), 0},
346 {offsetof(struct acpi_battery, design_capacity_low), 0},
347 {offsetof(struct acpi_battery, cycle_count), 0},
348 {offsetof(struct acpi_battery, measurement_accuracy), 0},
349 {offsetof(struct acpi_battery, max_sampling_time), 0},
350 {offsetof(struct acpi_battery, min_sampling_time), 0},
351 {offsetof(struct acpi_battery, max_averaging_interval), 0},
352 {offsetof(struct acpi_battery, min_averaging_interval), 0},
353 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
354 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
355 {offsetof(struct acpi_battery, model_number), 1},
356 {offsetof(struct acpi_battery, serial_number), 1},
357 {offsetof(struct acpi_battery, type), 1},
358 {offsetof(struct acpi_battery, oem_info), 1},
359};
360
361static int extract_package(struct acpi_battery *battery,
362 union acpi_object *package,
363 struct acpi_offsets *offsets, int num)
364{
365 int i;
366 union acpi_object *element;
367 if (package->type != ACPI_TYPE_PACKAGE)
368 return -EFAULT;
369 for (i = 0; i < num; ++i) {
370 if (package->package.count <= i)
371 return -EFAULT;
372 element = &package->package.elements[i];
373 if (offsets[i].mode) {
374 u8 *ptr = (u8 *)battery + offsets[i].offset;
375 if (element->type == ACPI_TYPE_STRING ||
376 element->type == ACPI_TYPE_BUFFER)
377 strncpy(ptr, element->string.pointer, 32);
378 else if (element->type == ACPI_TYPE_INTEGER) {
379 strncpy(ptr, (u8 *)&element->integer.value,
380 sizeof(u64));
381 ptr[sizeof(u64)] = 0;
382 } else
383 *ptr = 0; /* don't have value */
384 } else {
385 int *x = (int *)((u8 *)battery + offsets[i].offset);
386 *x = (element->type == ACPI_TYPE_INTEGER) ?
387 element->integer.value : -1;
388 }
389 }
390 return 0;
391}
392
393static int acpi_battery_get_status(struct acpi_battery *battery)
394{
395 if (acpi_bus_get_status(battery->device)) {
396 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
397 return -ENODEV;
398 }
399 return 0;
400}
401
402static int acpi_battery_get_info(struct acpi_battery *battery)
403{
404 int result = -EFAULT;
405 acpi_status status = 0;
406 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
407 "_BIX" : "_BIF";
408
409 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
410
411 if (!acpi_battery_present(battery))
412 return 0;
413 mutex_lock(&battery->lock);
414 status = acpi_evaluate_object(battery->device->handle, name,
415 NULL, &buffer);
416 mutex_unlock(&battery->lock);
417
418 if (ACPI_FAILURE(status)) {
419 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
420 return -ENODEV;
421 }
422 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
423 result = extract_package(battery, buffer.pointer,
424 extended_info_offsets,
425 ARRAY_SIZE(extended_info_offsets));
426 else
427 result = extract_package(battery, buffer.pointer,
428 info_offsets, ARRAY_SIZE(info_offsets));
429 kfree(buffer.pointer);
430 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
431 battery->full_charge_capacity = battery->design_capacity;
432 return result;
433}
434
435static int acpi_battery_get_state(struct acpi_battery *battery)
436{
437 int result = 0;
438 acpi_status status = 0;
439 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
440
441 if (!acpi_battery_present(battery))
442 return 0;
443
444 if (battery->update_time &&
445 time_before(jiffies, battery->update_time +
446 msecs_to_jiffies(cache_time)))
447 return 0;
448
449 mutex_lock(&battery->lock);
450 status = acpi_evaluate_object(battery->device->handle, "_BST",
451 NULL, &buffer);
452 mutex_unlock(&battery->lock);
453
454 if (ACPI_FAILURE(status)) {
455 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
456 return -ENODEV;
457 }
458
459 result = extract_package(battery, buffer.pointer,
460 state_offsets, ARRAY_SIZE(state_offsets));
461 battery->update_time = jiffies;
462 kfree(buffer.pointer);
463
464 /* For buggy DSDTs that report negative 16-bit values for either
465 * charging or discharging current and/or report 0 as 65536
466 * due to bad math.
467 */
468 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
469 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
470 (s16)(battery->rate_now) < 0) {
471 battery->rate_now = abs((s16)battery->rate_now);
472 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
473 " invalid.\n");
474 }
475
476 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
477 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
478 battery->capacity_now = (battery->capacity_now *
479 battery->full_charge_capacity) / 100;
480 return result;
481}
482
483static int acpi_battery_set_alarm(struct acpi_battery *battery)
484{
485 acpi_status status = 0;
486 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
487 struct acpi_object_list arg_list = { 1, &arg0 };
488
489 if (!acpi_battery_present(battery) ||
490 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
491 return -ENODEV;
492
493 arg0.integer.value = battery->alarm;
494
495 mutex_lock(&battery->lock);
496 status = acpi_evaluate_object(battery->device->handle, "_BTP",
497 &arg_list, NULL);
498 mutex_unlock(&battery->lock);
499
500 if (ACPI_FAILURE(status))
501 return -ENODEV;
502
503 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
504 return 0;
505}
506
507static int acpi_battery_init_alarm(struct acpi_battery *battery)
508{
509 acpi_status status = AE_OK;
510 acpi_handle handle = NULL;
511
512 /* See if alarms are supported, and if so, set default */
513 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
514 if (ACPI_FAILURE(status)) {
515 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
516 return 0;
517 }
518 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
519 if (!battery->alarm)
520 battery->alarm = battery->design_capacity_warning;
521 return acpi_battery_set_alarm(battery);
522}
523
524static ssize_t acpi_battery_alarm_show(struct device *dev,
525 struct device_attribute *attr,
526 char *buf)
527{
528 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
529 return sprintf(buf, "%d\n", battery->alarm * 1000);
530}
531
532static ssize_t acpi_battery_alarm_store(struct device *dev,
533 struct device_attribute *attr,
534 const char *buf, size_t count)
535{
536 unsigned long x;
537 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
538 if (sscanf(buf, "%ld\n", &x) == 1)
539 battery->alarm = x/1000;
540 if (acpi_battery_present(battery))
541 acpi_battery_set_alarm(battery);
542 return count;
543}
544
545static struct device_attribute alarm_attr = {
546 .attr = {.name = "alarm", .mode = 0644},
547 .show = acpi_battery_alarm_show,
548 .store = acpi_battery_alarm_store,
549};
550
551static int sysfs_add_battery(struct acpi_battery *battery)
552{
553 int result;
554
555 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
556 battery->bat.properties = charge_battery_props;
557 battery->bat.num_properties =
558 ARRAY_SIZE(charge_battery_props);
559 } else {
560 battery->bat.properties = energy_battery_props;
561 battery->bat.num_properties =
562 ARRAY_SIZE(energy_battery_props);
563 }
564
565 battery->bat.name = acpi_device_bid(battery->device);
566 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
567 battery->bat.get_property = acpi_battery_get_property;
568
569 result = power_supply_register(&battery->device->dev, &battery->bat);
570 if (result)
571 return result;
572 return device_create_file(battery->bat.dev, &alarm_attr);
573}
574
575static void sysfs_remove_battery(struct acpi_battery *battery)
576{
577 mutex_lock(&battery->sysfs_lock);
578 if (!battery->bat.dev) {
579 mutex_unlock(&battery->sysfs_lock);
580 return;
581 }
582
583 device_remove_file(battery->bat.dev, &alarm_attr);
584 power_supply_unregister(&battery->bat);
585 battery->bat.dev = NULL;
586 mutex_unlock(&battery->sysfs_lock);
587}
588
589/*
590 * According to the ACPI spec, some kinds of primary batteries can
591 * report percentage battery remaining capacity directly to OS.
592 * In this case, it reports the Last Full Charged Capacity == 100
593 * and BatteryPresentRate == 0xFFFFFFFF.
594 *
595 * Now we found some battery reports percentage remaining capacity
596 * even if it's rechargeable.
597 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
598 *
599 * Handle this correctly so that they won't break userspace.
600 */
601static void acpi_battery_quirks(struct acpi_battery *battery)
602{
603 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
604 return ;
605
606 if (battery->full_charge_capacity == 100 &&
607 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
608 battery->capacity_now >=0 && battery->capacity_now <= 100) {
609 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
610 battery->full_charge_capacity = battery->design_capacity;
611 battery->capacity_now = (battery->capacity_now *
612 battery->full_charge_capacity) / 100;
613 }
614}
615
616static int acpi_battery_update(struct acpi_battery *battery)
617{
618 int result, old_present = acpi_battery_present(battery);
619 result = acpi_battery_get_status(battery);
620 if (result)
621 return result;
622 if (!acpi_battery_present(battery)) {
623 sysfs_remove_battery(battery);
624 battery->update_time = 0;
625 return 0;
626 }
627 if (!battery->update_time ||
628 old_present != acpi_battery_present(battery)) {
629 result = acpi_battery_get_info(battery);
630 if (result)
631 return result;
632 acpi_battery_init_alarm(battery);
633 }
634 if (!battery->bat.dev) {
635 result = sysfs_add_battery(battery);
636 if (result)
637 return result;
638 }
639 result = acpi_battery_get_state(battery);
640 acpi_battery_quirks(battery);
641 return result;
642}
643
644static void acpi_battery_refresh(struct acpi_battery *battery)
645{
646 if (!battery->bat.dev)
647 return;
648
649 acpi_battery_get_info(battery);
650 /* The battery may have changed its reporting units. */
651 sysfs_remove_battery(battery);
652 sysfs_add_battery(battery);
653}
654
655/* --------------------------------------------------------------------------
656 FS Interface (/proc)
657 -------------------------------------------------------------------------- */
658
659#ifdef CONFIG_ACPI_PROCFS_POWER
660static struct proc_dir_entry *acpi_battery_dir;
661
662static int acpi_battery_print_info(struct seq_file *seq, int result)
663{
664 struct acpi_battery *battery = seq->private;
665
666 if (result)
667 goto end;
668
669 seq_printf(seq, "present: %s\n",
670 acpi_battery_present(battery)?"yes":"no");
671 if (!acpi_battery_present(battery))
672 goto end;
673 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
674 seq_printf(seq, "design capacity: unknown\n");
675 else
676 seq_printf(seq, "design capacity: %d %sh\n",
677 battery->design_capacity,
678 acpi_battery_units(battery));
679
680 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
681 seq_printf(seq, "last full capacity: unknown\n");
682 else
683 seq_printf(seq, "last full capacity: %d %sh\n",
684 battery->full_charge_capacity,
685 acpi_battery_units(battery));
686
687 seq_printf(seq, "battery technology: %srechargeable\n",
688 (!battery->technology)?"non-":"");
689
690 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
691 seq_printf(seq, "design voltage: unknown\n");
692 else
693 seq_printf(seq, "design voltage: %d mV\n",
694 battery->design_voltage);
695 seq_printf(seq, "design capacity warning: %d %sh\n",
696 battery->design_capacity_warning,
697 acpi_battery_units(battery));
698 seq_printf(seq, "design capacity low: %d %sh\n",
699 battery->design_capacity_low,
700 acpi_battery_units(battery));
701 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
702 seq_printf(seq, "capacity granularity 1: %d %sh\n",
703 battery->capacity_granularity_1,
704 acpi_battery_units(battery));
705 seq_printf(seq, "capacity granularity 2: %d %sh\n",
706 battery->capacity_granularity_2,
707 acpi_battery_units(battery));
708 seq_printf(seq, "model number: %s\n", battery->model_number);
709 seq_printf(seq, "serial number: %s\n", battery->serial_number);
710 seq_printf(seq, "battery type: %s\n", battery->type);
711 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
712 end:
713 if (result)
714 seq_printf(seq, "ERROR: Unable to read battery info\n");
715 return result;
716}
717
718static int acpi_battery_print_state(struct seq_file *seq, int result)
719{
720 struct acpi_battery *battery = seq->private;
721
722 if (result)
723 goto end;
724
725 seq_printf(seq, "present: %s\n",
726 acpi_battery_present(battery)?"yes":"no");
727 if (!acpi_battery_present(battery))
728 goto end;
729
730 seq_printf(seq, "capacity state: %s\n",
731 (battery->state & 0x04)?"critical":"ok");
732 if ((battery->state & 0x01) && (battery->state & 0x02))
733 seq_printf(seq,
734 "charging state: charging/discharging\n");
735 else if (battery->state & 0x01)
736 seq_printf(seq, "charging state: discharging\n");
737 else if (battery->state & 0x02)
738 seq_printf(seq, "charging state: charging\n");
739 else
740 seq_printf(seq, "charging state: charged\n");
741
742 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
743 seq_printf(seq, "present rate: unknown\n");
744 else
745 seq_printf(seq, "present rate: %d %s\n",
746 battery->rate_now, acpi_battery_units(battery));
747
748 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
749 seq_printf(seq, "remaining capacity: unknown\n");
750 else
751 seq_printf(seq, "remaining capacity: %d %sh\n",
752 battery->capacity_now, acpi_battery_units(battery));
753 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
754 seq_printf(seq, "present voltage: unknown\n");
755 else
756 seq_printf(seq, "present voltage: %d mV\n",
757 battery->voltage_now);
758 end:
759 if (result)
760 seq_printf(seq, "ERROR: Unable to read battery state\n");
761
762 return result;
763}
764
765static int acpi_battery_print_alarm(struct seq_file *seq, int result)
766{
767 struct acpi_battery *battery = seq->private;
768
769 if (result)
770 goto end;
771
772 if (!acpi_battery_present(battery)) {
773 seq_printf(seq, "present: no\n");
774 goto end;
775 }
776 seq_printf(seq, "alarm: ");
777 if (!battery->alarm)
778 seq_printf(seq, "unsupported\n");
779 else
780 seq_printf(seq, "%u %sh\n", battery->alarm,
781 acpi_battery_units(battery));
782 end:
783 if (result)
784 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
785 return result;
786}
787
788static ssize_t acpi_battery_write_alarm(struct file *file,
789 const char __user * buffer,
790 size_t count, loff_t * ppos)
791{
792 int result = 0;
793 char alarm_string[12] = { '\0' };
794 struct seq_file *m = file->private_data;
795 struct acpi_battery *battery = m->private;
796
797 if (!battery || (count > sizeof(alarm_string) - 1))
798 return -EINVAL;
799 if (!acpi_battery_present(battery)) {
800 result = -ENODEV;
801 goto end;
802 }
803 if (copy_from_user(alarm_string, buffer, count)) {
804 result = -EFAULT;
805 goto end;
806 }
807 alarm_string[count] = '\0';
808 battery->alarm = simple_strtol(alarm_string, NULL, 0);
809 result = acpi_battery_set_alarm(battery);
810 end:
811 if (!result)
812 return count;
813 return result;
814}
815
816typedef int(*print_func)(struct seq_file *seq, int result);
817
818static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
819 acpi_battery_print_info,
820 acpi_battery_print_state,
821 acpi_battery_print_alarm,
822};
823
824static int acpi_battery_read(int fid, struct seq_file *seq)
825{
826 struct acpi_battery *battery = seq->private;
827 int result = acpi_battery_update(battery);
828 return acpi_print_funcs[fid](seq, result);
829}
830
831#define DECLARE_FILE_FUNCTIONS(_name) \
832static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
833{ \
834 return acpi_battery_read(_name##_tag, seq); \
835} \
836static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
837{ \
838 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
839}
840
841DECLARE_FILE_FUNCTIONS(info);
842DECLARE_FILE_FUNCTIONS(state);
843DECLARE_FILE_FUNCTIONS(alarm);
844
845#undef DECLARE_FILE_FUNCTIONS
846
847#define FILE_DESCRIPTION_RO(_name) \
848 { \
849 .name = __stringify(_name), \
850 .mode = S_IRUGO, \
851 .ops = { \
852 .open = acpi_battery_##_name##_open_fs, \
853 .read = seq_read, \
854 .llseek = seq_lseek, \
855 .release = single_release, \
856 .owner = THIS_MODULE, \
857 }, \
858 }
859
860#define FILE_DESCRIPTION_RW(_name) \
861 { \
862 .name = __stringify(_name), \
863 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
864 .ops = { \
865 .open = acpi_battery_##_name##_open_fs, \
866 .read = seq_read, \
867 .llseek = seq_lseek, \
868 .write = acpi_battery_write_##_name, \
869 .release = single_release, \
870 .owner = THIS_MODULE, \
871 }, \
872 }
873
874static const struct battery_file {
875 struct file_operations ops;
876 mode_t mode;
877 const char *name;
878} acpi_battery_file[] = {
879 FILE_DESCRIPTION_RO(info),
880 FILE_DESCRIPTION_RO(state),
881 FILE_DESCRIPTION_RW(alarm),
882};
883
884#undef FILE_DESCRIPTION_RO
885#undef FILE_DESCRIPTION_RW
886
887static int acpi_battery_add_fs(struct acpi_device *device)
888{
889 struct proc_dir_entry *entry = NULL;
890 int i;
891
892 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
893 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
894 if (!acpi_device_dir(device)) {
895 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
896 acpi_battery_dir);
897 if (!acpi_device_dir(device))
898 return -ENODEV;
899 }
900
901 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
902 entry = proc_create_data(acpi_battery_file[i].name,
903 acpi_battery_file[i].mode,
904 acpi_device_dir(device),
905 &acpi_battery_file[i].ops,
906 acpi_driver_data(device));
907 if (!entry)
908 return -ENODEV;
909 }
910 return 0;
911}
912
913static void acpi_battery_remove_fs(struct acpi_device *device)
914{
915 int i;
916 if (!acpi_device_dir(device))
917 return;
918 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
919 remove_proc_entry(acpi_battery_file[i].name,
920 acpi_device_dir(device));
921
922 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
923 acpi_device_dir(device) = NULL;
924}
925
926#endif
927
928/* --------------------------------------------------------------------------
929 Driver Interface
930 -------------------------------------------------------------------------- */
931
932static void acpi_battery_notify(struct acpi_device *device, u32 event)
933{
934 struct acpi_battery *battery = acpi_driver_data(device);
935 struct device *old;
936
937 if (!battery)
938 return;
939 old = battery->bat.dev;
940 if (event == ACPI_BATTERY_NOTIFY_INFO)
941 acpi_battery_refresh(battery);
942 acpi_battery_update(battery);
943 acpi_bus_generate_proc_event(device, event,
944 acpi_battery_present(battery));
945 acpi_bus_generate_netlink_event(device->pnp.device_class,
946 dev_name(&device->dev), event,
947 acpi_battery_present(battery));
948 /* acpi_battery_update could remove power_supply object */
949 if (old && battery->bat.dev)
950 power_supply_changed(&battery->bat);
951}
952
953static int battery_notify(struct notifier_block *nb,
954 unsigned long mode, void *_unused)
955{
956 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
957 pm_nb);
958 switch (mode) {
959 case PM_POST_HIBERNATION:
960 case PM_POST_SUSPEND:
961 if (battery->bat.dev) {
962 sysfs_remove_battery(battery);
963 sysfs_add_battery(battery);
964 }
965 break;
966 }
967
968 return 0;
969}
970
971static int acpi_battery_add(struct acpi_device *device)
972{
973 int result = 0;
974 struct acpi_battery *battery = NULL;
975 acpi_handle handle;
976 if (!device)
977 return -EINVAL;
978 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
979 if (!battery)
980 return -ENOMEM;
981 battery->device = device;
982 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
983 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
984 device->driver_data = battery;
985 mutex_init(&battery->lock);
986 mutex_init(&battery->sysfs_lock);
987 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
988 "_BIX", &handle)))
989 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
990 result = acpi_battery_update(battery);
991 if (result)
992 goto fail;
993#ifdef CONFIG_ACPI_PROCFS_POWER
994 result = acpi_battery_add_fs(device);
995#endif
996 if (result) {
997#ifdef CONFIG_ACPI_PROCFS_POWER
998 acpi_battery_remove_fs(device);
999#endif
1000 goto fail;
1001 }
1002
1003 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1004 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1005 device->status.battery_present ? "present" : "absent");
1006
1007 battery->pm_nb.notifier_call = battery_notify;
1008 register_pm_notifier(&battery->pm_nb);
1009
1010 return result;
1011
1012fail:
1013 sysfs_remove_battery(battery);
1014 mutex_destroy(&battery->lock);
1015 mutex_destroy(&battery->sysfs_lock);
1016 kfree(battery);
1017 return result;
1018}
1019
1020static int acpi_battery_remove(struct acpi_device *device, int type)
1021{
1022 struct acpi_battery *battery = NULL;
1023
1024 if (!device || !acpi_driver_data(device))
1025 return -EINVAL;
1026 battery = acpi_driver_data(device);
1027 unregister_pm_notifier(&battery->pm_nb);
1028#ifdef CONFIG_ACPI_PROCFS_POWER
1029 acpi_battery_remove_fs(device);
1030#endif
1031 sysfs_remove_battery(battery);
1032 mutex_destroy(&battery->lock);
1033 mutex_destroy(&battery->sysfs_lock);
1034 kfree(battery);
1035 return 0;
1036}
1037
1038/* this is needed to learn about changes made in suspended state */
1039static int acpi_battery_resume(struct acpi_device *device)
1040{
1041 struct acpi_battery *battery;
1042 if (!device)
1043 return -EINVAL;
1044 battery = acpi_driver_data(device);
1045 battery->update_time = 0;
1046 acpi_battery_update(battery);
1047 return 0;
1048}
1049
1050static struct acpi_driver acpi_battery_driver = {
1051 .name = "battery",
1052 .class = ACPI_BATTERY_CLASS,
1053 .ids = battery_device_ids,
1054 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1055 .ops = {
1056 .add = acpi_battery_add,
1057 .resume = acpi_battery_resume,
1058 .remove = acpi_battery_remove,
1059 .notify = acpi_battery_notify,
1060 },
1061};
1062
1063static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1064{
1065 if (acpi_disabled)
1066 return;
1067#ifdef CONFIG_ACPI_PROCFS_POWER
1068 acpi_battery_dir = acpi_lock_battery_dir();
1069 if (!acpi_battery_dir)
1070 return;
1071#endif
1072 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1073#ifdef CONFIG_ACPI_PROCFS_POWER
1074 acpi_unlock_battery_dir(acpi_battery_dir);
1075#endif
1076 return;
1077 }
1078 return;
1079}
1080
1081static int __init acpi_battery_init(void)
1082{
1083 async_schedule(acpi_battery_init_async, NULL);
1084 return 0;
1085}
1086
1087static void __exit acpi_battery_exit(void)
1088{
1089 acpi_bus_unregister_driver(&acpi_battery_driver);
1090#ifdef CONFIG_ACPI_PROCFS_POWER
1091 acpi_unlock_battery_dir(acpi_battery_dir);
1092#endif
1093}
1094
1095module_init(acpi_battery_init);
1096module_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) "ACPI: battery: " fmt
12
13#include <linux/async.h>
14#include <linux/delay.h>
15#include <linux/dmi.h>
16#include <linux/jiffies.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/slab.h>
22#include <linux/suspend.h>
23#include <linux/types.h>
24
25#include <asm/unaligned.h>
26
27#include <linux/acpi.h>
28#include <linux/power_supply.h>
29
30#include <acpi/battery.h>
31
32#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
33#define ACPI_BATTERY_CAPACITY_VALID(capacity) \
34 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
35
36#define ACPI_BATTERY_DEVICE_NAME "Battery"
37
38/* Battery power unit: 0 means mW, 1 means mA */
39#define ACPI_BATTERY_POWER_UNIT_MA 1
40
41#define ACPI_BATTERY_STATE_DISCHARGING 0x1
42#define ACPI_BATTERY_STATE_CHARGING 0x2
43#define ACPI_BATTERY_STATE_CRITICAL 0x4
44
45MODULE_AUTHOR("Paul Diefenbaugh");
46MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
47MODULE_DESCRIPTION("ACPI Battery Driver");
48MODULE_LICENSE("GPL");
49
50static async_cookie_t async_cookie;
51static bool battery_driver_registered;
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[32];
122 char serial_number[32];
123 char type[32];
124 char oem_info[32];
125 int state;
126 int power_unit;
127 unsigned long flags;
128};
129
130#define to_acpi_battery(x) power_supply_get_drvdata(x)
131
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 or critical low */
157 if (battery->state != 0)
158 return 0;
159
160 /* battery not reporting charge */
161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
162 battery->capacity_now == 0)
163 return 0;
164
165 /* good batteries update full_charge as the batteries degrade */
166 if (battery->full_charge_capacity == battery->capacity_now)
167 return 1;
168
169 /* fallback to using design values for broken batteries */
170 if (battery->design_capacity <= battery->capacity_now)
171 return 1;
172
173 /* we don't do any sort of metric based on percentages */
174 return 0;
175}
176
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 (acpi_battery_is_charged(battery))
217 val->intval = POWER_SUPPLY_STATUS_FULL;
218 else
219 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
220 break;
221 case POWER_SUPPLY_PROP_PRESENT:
222 val->intval = acpi_battery_present(battery);
223 break;
224 case POWER_SUPPLY_PROP_TECHNOLOGY:
225 val->intval = acpi_battery_technology(battery);
226 break;
227 case POWER_SUPPLY_PROP_CYCLE_COUNT:
228 val->intval = battery->cycle_count;
229 break;
230 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
231 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
232 ret = -ENODEV;
233 else
234 val->intval = battery->design_voltage * 1000;
235 break;
236 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
237 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
238 ret = -ENODEV;
239 else
240 val->intval = battery->voltage_now * 1000;
241 break;
242 case POWER_SUPPLY_PROP_CURRENT_NOW:
243 case POWER_SUPPLY_PROP_POWER_NOW:
244 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
245 ret = -ENODEV;
246 else
247 val->intval = battery->rate_now * 1000;
248 break;
249 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
250 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
251 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
252 ret = -ENODEV;
253 else
254 val->intval = battery->design_capacity * 1000;
255 break;
256 case POWER_SUPPLY_PROP_CHARGE_FULL:
257 case POWER_SUPPLY_PROP_ENERGY_FULL:
258 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
259 ret = -ENODEV;
260 else
261 val->intval = battery->full_charge_capacity * 1000;
262 break;
263 case POWER_SUPPLY_PROP_CHARGE_NOW:
264 case POWER_SUPPLY_PROP_ENERGY_NOW:
265 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
266 ret = -ENODEV;
267 else
268 val->intval = battery->capacity_now * 1000;
269 break;
270 case POWER_SUPPLY_PROP_CAPACITY:
271 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
272 full_capacity = battery->full_charge_capacity;
273 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
274 full_capacity = battery->design_capacity;
275
276 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
277 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
278 ret = -ENODEV;
279 else
280 val->intval = battery->capacity_now * 100/
281 full_capacity;
282 break;
283 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
284 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
285 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
286 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
287 (battery->capacity_now <= battery->alarm))
288 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
289 else if (acpi_battery_is_charged(battery))
290 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
291 else
292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
293 break;
294 case POWER_SUPPLY_PROP_MODEL_NAME:
295 val->strval = battery->model_number;
296 break;
297 case POWER_SUPPLY_PROP_MANUFACTURER:
298 val->strval = battery->oem_info;
299 break;
300 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
301 val->strval = battery->serial_number;
302 break;
303 default:
304 ret = -EINVAL;
305 }
306 return ret;
307}
308
309static enum power_supply_property charge_battery_props[] = {
310 POWER_SUPPLY_PROP_STATUS,
311 POWER_SUPPLY_PROP_PRESENT,
312 POWER_SUPPLY_PROP_TECHNOLOGY,
313 POWER_SUPPLY_PROP_CYCLE_COUNT,
314 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
315 POWER_SUPPLY_PROP_VOLTAGE_NOW,
316 POWER_SUPPLY_PROP_CURRENT_NOW,
317 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
318 POWER_SUPPLY_PROP_CHARGE_FULL,
319 POWER_SUPPLY_PROP_CHARGE_NOW,
320 POWER_SUPPLY_PROP_CAPACITY,
321 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
322 POWER_SUPPLY_PROP_MODEL_NAME,
323 POWER_SUPPLY_PROP_MANUFACTURER,
324 POWER_SUPPLY_PROP_SERIAL_NUMBER,
325};
326
327static enum power_supply_property charge_battery_full_cap_broken_props[] = {
328 POWER_SUPPLY_PROP_STATUS,
329 POWER_SUPPLY_PROP_PRESENT,
330 POWER_SUPPLY_PROP_TECHNOLOGY,
331 POWER_SUPPLY_PROP_CYCLE_COUNT,
332 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
333 POWER_SUPPLY_PROP_VOLTAGE_NOW,
334 POWER_SUPPLY_PROP_CURRENT_NOW,
335 POWER_SUPPLY_PROP_CHARGE_NOW,
336 POWER_SUPPLY_PROP_MODEL_NAME,
337 POWER_SUPPLY_PROP_MANUFACTURER,
338 POWER_SUPPLY_PROP_SERIAL_NUMBER,
339};
340
341static enum power_supply_property energy_battery_props[] = {
342 POWER_SUPPLY_PROP_STATUS,
343 POWER_SUPPLY_PROP_PRESENT,
344 POWER_SUPPLY_PROP_TECHNOLOGY,
345 POWER_SUPPLY_PROP_CYCLE_COUNT,
346 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
347 POWER_SUPPLY_PROP_VOLTAGE_NOW,
348 POWER_SUPPLY_PROP_POWER_NOW,
349 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
350 POWER_SUPPLY_PROP_ENERGY_FULL,
351 POWER_SUPPLY_PROP_ENERGY_NOW,
352 POWER_SUPPLY_PROP_CAPACITY,
353 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
354 POWER_SUPPLY_PROP_MODEL_NAME,
355 POWER_SUPPLY_PROP_MANUFACTURER,
356 POWER_SUPPLY_PROP_SERIAL_NUMBER,
357};
358
359static enum power_supply_property energy_battery_full_cap_broken_props[] = {
360 POWER_SUPPLY_PROP_STATUS,
361 POWER_SUPPLY_PROP_PRESENT,
362 POWER_SUPPLY_PROP_TECHNOLOGY,
363 POWER_SUPPLY_PROP_CYCLE_COUNT,
364 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
365 POWER_SUPPLY_PROP_VOLTAGE_NOW,
366 POWER_SUPPLY_PROP_POWER_NOW,
367 POWER_SUPPLY_PROP_ENERGY_NOW,
368 POWER_SUPPLY_PROP_MODEL_NAME,
369 POWER_SUPPLY_PROP_MANUFACTURER,
370 POWER_SUPPLY_PROP_SERIAL_NUMBER,
371};
372
373/* Battery Management */
374struct acpi_offsets {
375 size_t offset; /* offset inside struct acpi_sbs_battery */
376 u8 mode; /* int or string? */
377};
378
379static const struct acpi_offsets state_offsets[] = {
380 {offsetof(struct acpi_battery, state), 0},
381 {offsetof(struct acpi_battery, rate_now), 0},
382 {offsetof(struct acpi_battery, capacity_now), 0},
383 {offsetof(struct acpi_battery, voltage_now), 0},
384};
385
386static const struct acpi_offsets info_offsets[] = {
387 {offsetof(struct acpi_battery, power_unit), 0},
388 {offsetof(struct acpi_battery, design_capacity), 0},
389 {offsetof(struct acpi_battery, full_charge_capacity), 0},
390 {offsetof(struct acpi_battery, technology), 0},
391 {offsetof(struct acpi_battery, design_voltage), 0},
392 {offsetof(struct acpi_battery, design_capacity_warning), 0},
393 {offsetof(struct acpi_battery, design_capacity_low), 0},
394 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
395 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
396 {offsetof(struct acpi_battery, model_number), 1},
397 {offsetof(struct acpi_battery, serial_number), 1},
398 {offsetof(struct acpi_battery, type), 1},
399 {offsetof(struct acpi_battery, oem_info), 1},
400};
401
402static const struct acpi_offsets extended_info_offsets[] = {
403 {offsetof(struct acpi_battery, revision), 0},
404 {offsetof(struct acpi_battery, power_unit), 0},
405 {offsetof(struct acpi_battery, design_capacity), 0},
406 {offsetof(struct acpi_battery, full_charge_capacity), 0},
407 {offsetof(struct acpi_battery, technology), 0},
408 {offsetof(struct acpi_battery, design_voltage), 0},
409 {offsetof(struct acpi_battery, design_capacity_warning), 0},
410 {offsetof(struct acpi_battery, design_capacity_low), 0},
411 {offsetof(struct acpi_battery, cycle_count), 0},
412 {offsetof(struct acpi_battery, measurement_accuracy), 0},
413 {offsetof(struct acpi_battery, max_sampling_time), 0},
414 {offsetof(struct acpi_battery, min_sampling_time), 0},
415 {offsetof(struct acpi_battery, max_averaging_interval), 0},
416 {offsetof(struct acpi_battery, min_averaging_interval), 0},
417 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
418 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
419 {offsetof(struct acpi_battery, model_number), 1},
420 {offsetof(struct acpi_battery, serial_number), 1},
421 {offsetof(struct acpi_battery, type), 1},
422 {offsetof(struct acpi_battery, oem_info), 1},
423};
424
425static int extract_package(struct acpi_battery *battery,
426 union acpi_object *package,
427 const struct acpi_offsets *offsets, int num)
428{
429 int i;
430 union acpi_object *element;
431
432 if (package->type != ACPI_TYPE_PACKAGE)
433 return -EFAULT;
434 for (i = 0; i < num; ++i) {
435 if (package->package.count <= i)
436 return -EFAULT;
437 element = &package->package.elements[i];
438 if (offsets[i].mode) {
439 u8 *ptr = (u8 *)battery + offsets[i].offset;
440
441 if (element->type == ACPI_TYPE_STRING ||
442 element->type == ACPI_TYPE_BUFFER)
443 strncpy(ptr, element->string.pointer, 32);
444 else if (element->type == ACPI_TYPE_INTEGER) {
445 strncpy(ptr, (u8 *)&element->integer.value,
446 sizeof(u64));
447 ptr[sizeof(u64)] = 0;
448 } else
449 *ptr = 0; /* don't have value */
450 } else {
451 int *x = (int *)((u8 *)battery + offsets[i].offset);
452 *x = (element->type == ACPI_TYPE_INTEGER) ?
453 element->integer.value : -1;
454 }
455 }
456 return 0;
457}
458
459static int acpi_battery_get_status(struct acpi_battery *battery)
460{
461 if (acpi_bus_get_status(battery->device)) {
462 acpi_handle_info(battery->device->handle,
463 "_STA evaluation failed\n");
464 return -ENODEV;
465 }
466 return 0;
467}
468
469
470static int extract_battery_info(const int use_bix,
471 struct acpi_battery *battery,
472 const struct acpi_buffer *buffer)
473{
474 int result = -EFAULT;
475
476 if (use_bix && battery_bix_broken_package)
477 result = extract_package(battery, buffer->pointer,
478 extended_info_offsets + 1,
479 ARRAY_SIZE(extended_info_offsets) - 1);
480 else if (use_bix)
481 result = extract_package(battery, buffer->pointer,
482 extended_info_offsets,
483 ARRAY_SIZE(extended_info_offsets));
484 else
485 result = extract_package(battery, buffer->pointer,
486 info_offsets, ARRAY_SIZE(info_offsets));
487 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
488 battery->full_charge_capacity = battery->design_capacity;
489 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
490 battery->power_unit && battery->design_voltage) {
491 battery->design_capacity = battery->design_capacity *
492 10000 / battery->design_voltage;
493 battery->full_charge_capacity = battery->full_charge_capacity *
494 10000 / battery->design_voltage;
495 battery->design_capacity_warning =
496 battery->design_capacity_warning *
497 10000 / battery->design_voltage;
498 /* Curiously, design_capacity_low, unlike the rest of them,
499 * is correct.
500 */
501 /* capacity_granularity_* equal 1 on the systems tested, so
502 * it's impossible to tell if they would need an adjustment
503 * or not if their values were higher.
504 */
505 }
506 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
507 battery->capacity_now > battery->full_charge_capacity)
508 battery->capacity_now = battery->full_charge_capacity;
509
510 return result;
511}
512
513static int acpi_battery_get_info(struct acpi_battery *battery)
514{
515 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
516 int use_bix;
517 int result = -ENODEV;
518
519 if (!acpi_battery_present(battery))
520 return 0;
521
522
523 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
524 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
525 acpi_status status = AE_ERROR;
526
527 mutex_lock(&battery->lock);
528 status = acpi_evaluate_object(battery->device->handle,
529 use_bix ? "_BIX":"_BIF",
530 NULL, &buffer);
531 mutex_unlock(&battery->lock);
532
533 if (ACPI_FAILURE(status)) {
534 acpi_handle_info(battery->device->handle,
535 "%s evaluation failed: %s\n",
536 use_bix ? "_BIX":"_BIF",
537 acpi_format_exception(status));
538 } else {
539 result = extract_battery_info(use_bix,
540 battery,
541 &buffer);
542
543 kfree(buffer.pointer);
544 break;
545 }
546 }
547
548 if (!result && !use_bix && xinfo)
549 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
550
551 return result;
552}
553
554static int acpi_battery_get_state(struct acpi_battery *battery)
555{
556 int result = 0;
557 acpi_status status = 0;
558 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
559
560 if (!acpi_battery_present(battery))
561 return 0;
562
563 if (battery->update_time &&
564 time_before(jiffies, battery->update_time +
565 msecs_to_jiffies(cache_time)))
566 return 0;
567
568 mutex_lock(&battery->lock);
569 status = acpi_evaluate_object(battery->device->handle, "_BST",
570 NULL, &buffer);
571 mutex_unlock(&battery->lock);
572
573 if (ACPI_FAILURE(status)) {
574 acpi_handle_info(battery->device->handle,
575 "_BST evaluation failed: %s",
576 acpi_format_exception(status));
577 return -ENODEV;
578 }
579
580 result = extract_package(battery, buffer.pointer,
581 state_offsets, ARRAY_SIZE(state_offsets));
582 battery->update_time = jiffies;
583 kfree(buffer.pointer);
584
585 /* For buggy DSDTs that report negative 16-bit values for either
586 * charging or discharging current and/or report 0 as 65536
587 * due to bad math.
588 */
589 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
590 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
591 (s16)(battery->rate_now) < 0) {
592 battery->rate_now = abs((s16)battery->rate_now);
593 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
594 }
595
596 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
597 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
598 battery->capacity_now = (battery->capacity_now *
599 battery->full_charge_capacity) / 100;
600 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
601 battery->power_unit && battery->design_voltage) {
602 battery->capacity_now = battery->capacity_now *
603 10000 / battery->design_voltage;
604 }
605 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
606 battery->capacity_now > battery->full_charge_capacity)
607 battery->capacity_now = battery->full_charge_capacity;
608
609 return result;
610}
611
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_handle_debug(battery->device->handle, "Alarm set to %d\n",
629 battery->alarm);
630
631 return 0;
632}
633
634static int acpi_battery_init_alarm(struct acpi_battery *battery)
635{
636 /* See if alarms are supported, and if so, set default */
637 if (!acpi_has_method(battery->device->handle, "_BTP")) {
638 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
639 return 0;
640 }
641 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
642 if (!battery->alarm)
643 battery->alarm = battery->design_capacity_warning;
644 return acpi_battery_set_alarm(battery);
645}
646
647static ssize_t acpi_battery_alarm_show(struct device *dev,
648 struct device_attribute *attr,
649 char *buf)
650{
651 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
652
653 return sprintf(buf, "%d\n", battery->alarm * 1000);
654}
655
656static ssize_t acpi_battery_alarm_store(struct device *dev,
657 struct device_attribute *attr,
658 const char *buf, size_t count)
659{
660 unsigned long x;
661 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
662
663 if (sscanf(buf, "%lu\n", &x) == 1)
664 battery->alarm = x/1000;
665 if (acpi_battery_present(battery))
666 acpi_battery_set_alarm(battery);
667 return count;
668}
669
670static const struct device_attribute alarm_attr = {
671 .attr = {.name = "alarm", .mode = 0644},
672 .show = acpi_battery_alarm_show,
673 .store = acpi_battery_alarm_store,
674};
675
676/*
677 * The Battery Hooking API
678 *
679 * This API is used inside other drivers that need to expose
680 * platform-specific behaviour within the generic driver in a
681 * generic way.
682 *
683 */
684
685static LIST_HEAD(acpi_battery_list);
686static LIST_HEAD(battery_hook_list);
687static DEFINE_MUTEX(hook_mutex);
688
689static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
690{
691 struct acpi_battery *battery;
692 /*
693 * In order to remove a hook, we first need to
694 * de-register all the batteries that are registered.
695 */
696 if (lock)
697 mutex_lock(&hook_mutex);
698 list_for_each_entry(battery, &acpi_battery_list, list) {
699 if (!hook->remove_battery(battery->bat, hook))
700 power_supply_changed(battery->bat);
701 }
702 list_del(&hook->list);
703 if (lock)
704 mutex_unlock(&hook_mutex);
705 pr_info("extension unregistered: %s\n", hook->name);
706}
707
708void battery_hook_unregister(struct acpi_battery_hook *hook)
709{
710 __battery_hook_unregister(hook, 1);
711}
712EXPORT_SYMBOL_GPL(battery_hook_unregister);
713
714void battery_hook_register(struct acpi_battery_hook *hook)
715{
716 struct acpi_battery *battery;
717
718 mutex_lock(&hook_mutex);
719 INIT_LIST_HEAD(&hook->list);
720 list_add(&hook->list, &battery_hook_list);
721 /*
722 * Now that the driver is registered, we need
723 * to notify the hook that a battery is available
724 * for each battery, so that the driver may add
725 * its attributes.
726 */
727 list_for_each_entry(battery, &acpi_battery_list, list) {
728 if (hook->add_battery(battery->bat, hook)) {
729 /*
730 * If a add-battery returns non-zero,
731 * the registration of the extension has failed,
732 * and we will not add it to the list of loaded
733 * hooks.
734 */
735 pr_err("extension failed to load: %s", hook->name);
736 __battery_hook_unregister(hook, 0);
737 goto end;
738 }
739
740 power_supply_changed(battery->bat);
741 }
742 pr_info("new extension: %s\n", hook->name);
743end:
744 mutex_unlock(&hook_mutex);
745}
746EXPORT_SYMBOL_GPL(battery_hook_register);
747
748/*
749 * This function gets called right after the battery sysfs
750 * attributes have been added, so that the drivers that
751 * define custom sysfs attributes can add their own.
752 */
753static void battery_hook_add_battery(struct acpi_battery *battery)
754{
755 struct acpi_battery_hook *hook_node, *tmp;
756
757 mutex_lock(&hook_mutex);
758 INIT_LIST_HEAD(&battery->list);
759 list_add(&battery->list, &acpi_battery_list);
760 /*
761 * Since we added a new battery to the list, we need to
762 * iterate over the hooks and call add_battery for each
763 * hook that was registered. This usually happens
764 * when a battery gets hotplugged or initialized
765 * during the battery module initialization.
766 */
767 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
768 if (hook_node->add_battery(battery->bat, hook_node)) {
769 /*
770 * The notification of the extensions has failed, to
771 * prevent further errors we will unload the extension.
772 */
773 pr_err("error in extension, unloading: %s",
774 hook_node->name);
775 __battery_hook_unregister(hook_node, 0);
776 }
777 }
778 mutex_unlock(&hook_mutex);
779}
780
781static void battery_hook_remove_battery(struct acpi_battery *battery)
782{
783 struct acpi_battery_hook *hook;
784
785 mutex_lock(&hook_mutex);
786 /*
787 * Before removing the hook, we need to remove all
788 * custom attributes from the battery.
789 */
790 list_for_each_entry(hook, &battery_hook_list, list) {
791 hook->remove_battery(battery->bat, hook);
792 }
793 /* Then, just remove the battery from the list */
794 list_del(&battery->list);
795 mutex_unlock(&hook_mutex);
796}
797
798static void __exit battery_hook_exit(void)
799{
800 struct acpi_battery_hook *hook;
801 struct acpi_battery_hook *ptr;
802 /*
803 * At this point, the acpi_bus_unregister_driver()
804 * has called remove for all batteries. We just
805 * need to remove the hooks.
806 */
807 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
808 __battery_hook_unregister(hook, 1);
809 }
810 mutex_destroy(&hook_mutex);
811}
812
813static int sysfs_add_battery(struct acpi_battery *battery)
814{
815 struct power_supply_config psy_cfg = { .drv_data = battery, };
816 bool full_cap_broken = false;
817
818 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
819 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
820 full_cap_broken = true;
821
822 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
823 if (full_cap_broken) {
824 battery->bat_desc.properties =
825 charge_battery_full_cap_broken_props;
826 battery->bat_desc.num_properties =
827 ARRAY_SIZE(charge_battery_full_cap_broken_props);
828 } else {
829 battery->bat_desc.properties = charge_battery_props;
830 battery->bat_desc.num_properties =
831 ARRAY_SIZE(charge_battery_props);
832 }
833 } else {
834 if (full_cap_broken) {
835 battery->bat_desc.properties =
836 energy_battery_full_cap_broken_props;
837 battery->bat_desc.num_properties =
838 ARRAY_SIZE(energy_battery_full_cap_broken_props);
839 } else {
840 battery->bat_desc.properties = energy_battery_props;
841 battery->bat_desc.num_properties =
842 ARRAY_SIZE(energy_battery_props);
843 }
844 }
845
846 battery->bat_desc.name = acpi_device_bid(battery->device);
847 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
848 battery->bat_desc.get_property = acpi_battery_get_property;
849
850 battery->bat = power_supply_register_no_ws(&battery->device->dev,
851 &battery->bat_desc, &psy_cfg);
852
853 if (IS_ERR(battery->bat)) {
854 int result = PTR_ERR(battery->bat);
855
856 battery->bat = NULL;
857 return result;
858 }
859 battery_hook_add_battery(battery);
860 return device_create_file(&battery->bat->dev, &alarm_attr);
861}
862
863static void sysfs_remove_battery(struct acpi_battery *battery)
864{
865 mutex_lock(&battery->sysfs_lock);
866 if (!battery->bat) {
867 mutex_unlock(&battery->sysfs_lock);
868 return;
869 }
870 battery_hook_remove_battery(battery);
871 device_remove_file(&battery->bat->dev, &alarm_attr);
872 power_supply_unregister(battery->bat);
873 battery->bat = NULL;
874 mutex_unlock(&battery->sysfs_lock);
875}
876
877static void find_battery(const struct dmi_header *dm, void *private)
878{
879 struct acpi_battery *battery = (struct acpi_battery *)private;
880 /* Note: the hardcoded offsets below have been extracted from
881 * the source code of dmidecode.
882 */
883 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
884 const u8 *dmi_data = (const u8 *)(dm + 1);
885 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
886
887 if (dm->length >= 18)
888 dmi_capacity *= dmi_data[17];
889 if (battery->design_capacity * battery->design_voltage / 1000
890 != dmi_capacity &&
891 battery->design_capacity * 10 == dmi_capacity)
892 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
893 &battery->flags);
894 }
895}
896
897/*
898 * According to the ACPI spec, some kinds of primary batteries can
899 * report percentage battery remaining capacity directly to OS.
900 * In this case, it reports the Last Full Charged Capacity == 100
901 * and BatteryPresentRate == 0xFFFFFFFF.
902 *
903 * Now we found some battery reports percentage remaining capacity
904 * even if it's rechargeable.
905 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
906 *
907 * Handle this correctly so that they won't break userspace.
908 */
909static void acpi_battery_quirks(struct acpi_battery *battery)
910{
911 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
912 return;
913
914 if (battery->full_charge_capacity == 100 &&
915 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
916 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
917 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
918 battery->full_charge_capacity = battery->design_capacity;
919 battery->capacity_now = (battery->capacity_now *
920 battery->full_charge_capacity) / 100;
921 }
922
923 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
924 return;
925
926 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
927 const char *s;
928
929 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
930 if (s && !strncasecmp(s, "ThinkPad", 8)) {
931 dmi_walk(find_battery, battery);
932 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
933 &battery->flags) &&
934 battery->design_voltage) {
935 battery->design_capacity =
936 battery->design_capacity *
937 10000 / battery->design_voltage;
938 battery->full_charge_capacity =
939 battery->full_charge_capacity *
940 10000 / battery->design_voltage;
941 battery->design_capacity_warning =
942 battery->design_capacity_warning *
943 10000 / battery->design_voltage;
944 battery->capacity_now = battery->capacity_now *
945 10000 / battery->design_voltage;
946 }
947 }
948 }
949
950 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
951 return;
952
953 if (acpi_battery_is_degraded(battery) &&
954 battery->capacity_now > battery->full_charge_capacity) {
955 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
956 battery->capacity_now = battery->full_charge_capacity;
957 }
958}
959
960static int acpi_battery_update(struct acpi_battery *battery, bool resume)
961{
962 int result = acpi_battery_get_status(battery);
963
964 if (result)
965 return result;
966
967 if (!acpi_battery_present(battery)) {
968 sysfs_remove_battery(battery);
969 battery->update_time = 0;
970 return 0;
971 }
972
973 if (resume)
974 return 0;
975
976 if (!battery->update_time) {
977 result = acpi_battery_get_info(battery);
978 if (result)
979 return result;
980 acpi_battery_init_alarm(battery);
981 }
982
983 result = acpi_battery_get_state(battery);
984 if (result)
985 return result;
986 acpi_battery_quirks(battery);
987
988 if (!battery->bat) {
989 result = sysfs_add_battery(battery);
990 if (result)
991 return result;
992 }
993
994 /*
995 * Wakeup the system if battery is critical low
996 * or lower than the alarm level
997 */
998 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
999 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1000 (battery->capacity_now <= battery->alarm)))
1001 acpi_pm_wakeup_event(&battery->device->dev);
1002
1003 return result;
1004}
1005
1006static void acpi_battery_refresh(struct acpi_battery *battery)
1007{
1008 int power_unit;
1009
1010 if (!battery->bat)
1011 return;
1012
1013 power_unit = battery->power_unit;
1014
1015 acpi_battery_get_info(battery);
1016
1017 if (power_unit == battery->power_unit)
1018 return;
1019
1020 /* The battery has changed its reporting units. */
1021 sysfs_remove_battery(battery);
1022 sysfs_add_battery(battery);
1023}
1024
1025/* Driver Interface */
1026static void acpi_battery_notify(struct acpi_device *device, u32 event)
1027{
1028 struct acpi_battery *battery = acpi_driver_data(device);
1029 struct power_supply *old;
1030
1031 if (!battery)
1032 return;
1033 old = battery->bat;
1034 /*
1035 * On Acer Aspire V5-573G notifications are sometimes triggered too
1036 * early. For example, when AC is unplugged and notification is
1037 * triggered, battery state is still reported as "Full", and changes to
1038 * "Discharging" only after short delay, without any notification.
1039 */
1040 if (battery_notification_delay_ms > 0)
1041 msleep(battery_notification_delay_ms);
1042 if (event == ACPI_BATTERY_NOTIFY_INFO)
1043 acpi_battery_refresh(battery);
1044 acpi_battery_update(battery, false);
1045 acpi_bus_generate_netlink_event(device->pnp.device_class,
1046 dev_name(&device->dev), event,
1047 acpi_battery_present(battery));
1048 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1049 /* acpi_battery_update could remove power_supply object */
1050 if (old && battery->bat)
1051 power_supply_changed(battery->bat);
1052}
1053
1054static int battery_notify(struct notifier_block *nb,
1055 unsigned long mode, void *_unused)
1056{
1057 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1058 pm_nb);
1059 int result;
1060
1061 switch (mode) {
1062 case PM_POST_HIBERNATION:
1063 case PM_POST_SUSPEND:
1064 if (!acpi_battery_present(battery))
1065 return 0;
1066
1067 if (battery->bat) {
1068 acpi_battery_refresh(battery);
1069 } else {
1070 result = acpi_battery_get_info(battery);
1071 if (result)
1072 return result;
1073
1074 result = sysfs_add_battery(battery);
1075 if (result)
1076 return result;
1077 }
1078
1079 acpi_battery_init_alarm(battery);
1080 acpi_battery_get_state(battery);
1081 break;
1082 }
1083
1084 return 0;
1085}
1086
1087static int __init
1088battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1089{
1090 battery_bix_broken_package = 1;
1091 return 0;
1092}
1093
1094static int __init
1095battery_notification_delay_quirk(const struct dmi_system_id *d)
1096{
1097 battery_notification_delay_ms = 1000;
1098 return 0;
1099}
1100
1101static int __init
1102battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1103{
1104 battery_ac_is_broken = 1;
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 /* Microsoft Surface Go 3 */
1138 .callback = battery_notification_delay_quirk,
1139 .matches = {
1140 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1141 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1142 },
1143 },
1144 {},
1145};
1146
1147/*
1148 * Some machines'(E,G Lenovo Z480) ECs are not stable
1149 * during boot up and this causes battery driver fails to be
1150 * probed due to failure of getting battery information
1151 * from EC sometimes. After several retries, the operation
1152 * may work. So add retry code here and 20ms sleep between
1153 * every retries.
1154 */
1155static int acpi_battery_update_retry(struct acpi_battery *battery)
1156{
1157 int retry, ret;
1158
1159 for (retry = 5; retry; retry--) {
1160 ret = acpi_battery_update(battery, false);
1161 if (!ret)
1162 break;
1163
1164 msleep(20);
1165 }
1166 return ret;
1167}
1168
1169static int acpi_battery_add(struct acpi_device *device)
1170{
1171 int result = 0;
1172 struct acpi_battery *battery = NULL;
1173
1174 if (!device)
1175 return -EINVAL;
1176
1177 if (device->dep_unmet)
1178 return -EPROBE_DEFER;
1179
1180 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1181 if (!battery)
1182 return -ENOMEM;
1183 battery->device = device;
1184 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1185 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1186 device->driver_data = battery;
1187 mutex_init(&battery->lock);
1188 mutex_init(&battery->sysfs_lock);
1189 if (acpi_has_method(battery->device->handle, "_BIX"))
1190 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1191
1192 result = acpi_battery_update_retry(battery);
1193 if (result)
1194 goto fail;
1195
1196 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1197 device->status.battery_present ? "present" : "absent");
1198
1199 battery->pm_nb.notifier_call = battery_notify;
1200 register_pm_notifier(&battery->pm_nb);
1201
1202 device_init_wakeup(&device->dev, 1);
1203
1204 return result;
1205
1206fail:
1207 sysfs_remove_battery(battery);
1208 mutex_destroy(&battery->lock);
1209 mutex_destroy(&battery->sysfs_lock);
1210 kfree(battery);
1211 return result;
1212}
1213
1214static void acpi_battery_remove(struct acpi_device *device)
1215{
1216 struct acpi_battery *battery = NULL;
1217
1218 if (!device || !acpi_driver_data(device))
1219 return;
1220 device_init_wakeup(&device->dev, 0);
1221 battery = acpi_driver_data(device);
1222 unregister_pm_notifier(&battery->pm_nb);
1223 sysfs_remove_battery(battery);
1224 mutex_destroy(&battery->lock);
1225 mutex_destroy(&battery->sysfs_lock);
1226 kfree(battery);
1227}
1228
1229#ifdef CONFIG_PM_SLEEP
1230/* this is needed to learn about changes made in suspended state */
1231static int acpi_battery_resume(struct device *dev)
1232{
1233 struct acpi_battery *battery;
1234
1235 if (!dev)
1236 return -EINVAL;
1237
1238 battery = acpi_driver_data(to_acpi_device(dev));
1239 if (!battery)
1240 return -EINVAL;
1241
1242 battery->update_time = 0;
1243 acpi_battery_update(battery, true);
1244 return 0;
1245}
1246#else
1247#define acpi_battery_resume NULL
1248#endif
1249
1250static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1251
1252static struct acpi_driver acpi_battery_driver = {
1253 .name = "battery",
1254 .class = ACPI_BATTERY_CLASS,
1255 .ids = battery_device_ids,
1256 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1257 .ops = {
1258 .add = acpi_battery_add,
1259 .remove = acpi_battery_remove,
1260 .notify = acpi_battery_notify,
1261 },
1262 .drv.pm = &acpi_battery_pm,
1263};
1264
1265static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1266{
1267 int result;
1268
1269 if (acpi_quirk_skip_acpi_ac_and_battery())
1270 return;
1271
1272 dmi_check_system(bat_dmi_table);
1273
1274 result = acpi_bus_register_driver(&acpi_battery_driver);
1275 battery_driver_registered = (result == 0);
1276}
1277
1278static int __init acpi_battery_init(void)
1279{
1280 if (acpi_disabled)
1281 return -ENODEV;
1282
1283 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1284 return 0;
1285}
1286
1287static void __exit acpi_battery_exit(void)
1288{
1289 async_synchronize_cookie(async_cookie + 1);
1290 if (battery_driver_registered) {
1291 acpi_bus_unregister_driver(&acpi_battery_driver);
1292 battery_hook_exit();
1293 }
1294}
1295
1296module_init(acpi_battery_init);
1297module_exit(acpi_battery_exit);