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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) 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);