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