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Merge tag 'omap-for-v3.13/fixes-against-rc1-take2' of git://git.kernel.org/pub/scm...
[linux-2.6.git] / drivers / acpi / battery.c
blobfbf1aceda8b8ab915a7d2476d78db2b6e2b94e68
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 #include <asm/unaligned.h>
38
39 #include <acpi/acpi_bus.h>
40 #include <acpi/acpi_drivers.h>
41 #include <linux/power_supply.h>
42
43 #define PREFIX "ACPI: "
44
45 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
46
47 #define ACPI_BATTERY_CLASS "battery"
48 #define ACPI_BATTERY_DEVICE_NAME "Battery"
49 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
50 #define ACPI_BATTERY_NOTIFY_INFO 0x81
51 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
52
53 /* Battery power unit: 0 means mW, 1 means mA */
54 #define ACPI_BATTERY_POWER_UNIT_MA 1
55
56 #define _COMPONENT ACPI_BATTERY_COMPONENT
57
58 ACPI_MODULE_NAME("battery");
59
60 MODULE_AUTHOR("Paul Diefenbaugh");
61 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
62 MODULE_DESCRIPTION("ACPI Battery Driver");
63 MODULE_LICENSE("GPL");
64
65 static unsigned int cache_time = 1000;
66 module_param(cache_time, uint, 0644);
67 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
68
69 static const struct acpi_device_id battery_device_ids[] = {
70 {"PNP0C0A", 0},
71 {"", 0},
72 };
73
74 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
75
76 enum {
77 ACPI_BATTERY_ALARM_PRESENT,
78 ACPI_BATTERY_XINFO_PRESENT,
79 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
80 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
81 switches between mWh and mAh depending on whether the system
82 is running on battery or not. When mAh is the unit, most
83 reported values are incorrect and need to be adjusted by
84 10000/design_voltage. Verified on x201, t410, t410s, and x220.
85 Pre-2010 and 2012 models appear to always report in mWh and
86 are thus unaffected (tested with t42, t61, t500, x200, x300,
87 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
88 the 2011 models that fixes the issue (tested on x220 with a
89 post-1.29 BIOS), but as of Nov. 2012, no such update is
90 available for the 2010 models. */
91 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
92 };
93
94 struct acpi_battery {
95 struct mutex lock;
96 struct mutex sysfs_lock;
97 struct power_supply bat;
98 struct acpi_device *device;
99 struct notifier_block pm_nb;
100 unsigned long update_time;
101 int revision;
102 int rate_now;
103 int capacity_now;
104 int voltage_now;
105 int design_capacity;
106 int full_charge_capacity;
107 int technology;
108 int design_voltage;
109 int design_capacity_warning;
110 int design_capacity_low;
111 int cycle_count;
112 int measurement_accuracy;
113 int max_sampling_time;
114 int min_sampling_time;
115 int max_averaging_interval;
116 int min_averaging_interval;
117 int capacity_granularity_1;
118 int capacity_granularity_2;
119 int alarm;
120 char model_number[32];
121 char serial_number[32];
122 char type[32];
123 char oem_info[32];
124 int state;
125 int power_unit;
126 unsigned long flags;
127 };
128
129 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
130
131 static inline int acpi_battery_present(struct acpi_battery *battery)
132 {
133 return battery->device->status.battery_present;
134 }
135
136 static int acpi_battery_technology(struct acpi_battery *battery)
137 {
138 if (!strcasecmp("NiCd", battery->type))
139 return POWER_SUPPLY_TECHNOLOGY_NiCd;
140 if (!strcasecmp("NiMH", battery->type))
141 return POWER_SUPPLY_TECHNOLOGY_NiMH;
142 if (!strcasecmp("LION", battery->type))
143 return POWER_SUPPLY_TECHNOLOGY_LION;
144 if (!strncasecmp("LI-ION", battery->type, 6))
145 return POWER_SUPPLY_TECHNOLOGY_LION;
146 if (!strcasecmp("LiP", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_LIPO;
148 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
149 }
150
151 static int acpi_battery_get_state(struct acpi_battery *battery);
152
153 static int acpi_battery_is_charged(struct acpi_battery *battery)
154 {
155 /* either charging or discharging */
156 if (battery->state != 0)
157 return 0;
158
159 /* battery not reporting charge */
160 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
161 battery->capacity_now == 0)
162 return 0;
163
164 /* good batteries update full_charge as the batteries degrade */
165 if (battery->full_charge_capacity == battery->capacity_now)
166 return 1;
167
168 /* fallback to using design values for broken batteries */
169 if (battery->design_capacity == battery->capacity_now)
170 return 1;
171
172 /* we don't do any sort of metric based on percentages */
173 return 0;
174 }
175
176 static int acpi_battery_get_property(struct power_supply *psy,
177 enum power_supply_property psp,
178 union power_supply_propval *val)
179 {
180 int ret = 0;
181 struct acpi_battery *battery = to_acpi_battery(psy);
182
183 if (acpi_battery_present(battery)) {
184 /* run battery update only if it is present */
185 acpi_battery_get_state(battery);
186 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
187 return -ENODEV;
188 switch (psp) {
189 case POWER_SUPPLY_PROP_STATUS:
190 if (battery->state & 0x01)
191 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
192 else if (battery->state & 0x02)
193 val->intval = POWER_SUPPLY_STATUS_CHARGING;
194 else if (acpi_battery_is_charged(battery))
195 val->intval = POWER_SUPPLY_STATUS_FULL;
196 else
197 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
198 break;
199 case POWER_SUPPLY_PROP_PRESENT:
200 val->intval = acpi_battery_present(battery);
201 break;
202 case POWER_SUPPLY_PROP_TECHNOLOGY:
203 val->intval = acpi_battery_technology(battery);
204 break;
205 case POWER_SUPPLY_PROP_CYCLE_COUNT:
206 val->intval = battery->cycle_count;
207 break;
208 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
209 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
210 ret = -ENODEV;
211 else
212 val->intval = battery->design_voltage * 1000;
213 break;
214 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
215 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
216 ret = -ENODEV;
217 else
218 val->intval = battery->voltage_now * 1000;
219 break;
220 case POWER_SUPPLY_PROP_CURRENT_NOW:
221 case POWER_SUPPLY_PROP_POWER_NOW:
222 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
223 ret = -ENODEV;
224 else
225 val->intval = battery->rate_now * 1000;
226 break;
227 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
228 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
229 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
230 ret = -ENODEV;
231 else
232 val->intval = battery->design_capacity * 1000;
233 break;
234 case POWER_SUPPLY_PROP_CHARGE_FULL:
235 case POWER_SUPPLY_PROP_ENERGY_FULL:
236 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
237 ret = -ENODEV;
238 else
239 val->intval = battery->full_charge_capacity * 1000;
240 break;
241 case POWER_SUPPLY_PROP_CHARGE_NOW:
242 case POWER_SUPPLY_PROP_ENERGY_NOW:
243 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
244 ret = -ENODEV;
245 else
246 val->intval = battery->capacity_now * 1000;
247 break;
248 case POWER_SUPPLY_PROP_CAPACITY:
249 if (battery->capacity_now && battery->full_charge_capacity)
250 val->intval = battery->capacity_now * 100/
251 battery->full_charge_capacity;
252 else
253 val->intval = 0;
254 break;
255 case POWER_SUPPLY_PROP_MODEL_NAME:
256 val->strval = battery->model_number;
257 break;
258 case POWER_SUPPLY_PROP_MANUFACTURER:
259 val->strval = battery->oem_info;
260 break;
261 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
262 val->strval = battery->serial_number;
263 break;
264 default:
265 ret = -EINVAL;
266 }
267 return ret;
268 }
269
270 static enum power_supply_property charge_battery_props[] = {
271 POWER_SUPPLY_PROP_STATUS,
272 POWER_SUPPLY_PROP_PRESENT,
273 POWER_SUPPLY_PROP_TECHNOLOGY,
274 POWER_SUPPLY_PROP_CYCLE_COUNT,
275 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
276 POWER_SUPPLY_PROP_VOLTAGE_NOW,
277 POWER_SUPPLY_PROP_CURRENT_NOW,
278 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
279 POWER_SUPPLY_PROP_CHARGE_FULL,
280 POWER_SUPPLY_PROP_CHARGE_NOW,
281 POWER_SUPPLY_PROP_CAPACITY,
282 POWER_SUPPLY_PROP_MODEL_NAME,
283 POWER_SUPPLY_PROP_MANUFACTURER,
284 POWER_SUPPLY_PROP_SERIAL_NUMBER,
285 };
286
287 static enum power_supply_property energy_battery_props[] = {
288 POWER_SUPPLY_PROP_STATUS,
289 POWER_SUPPLY_PROP_PRESENT,
290 POWER_SUPPLY_PROP_TECHNOLOGY,
291 POWER_SUPPLY_PROP_CYCLE_COUNT,
292 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
293 POWER_SUPPLY_PROP_VOLTAGE_NOW,
294 POWER_SUPPLY_PROP_POWER_NOW,
295 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
296 POWER_SUPPLY_PROP_ENERGY_FULL,
297 POWER_SUPPLY_PROP_ENERGY_NOW,
298 POWER_SUPPLY_PROP_CAPACITY,
299 POWER_SUPPLY_PROP_MODEL_NAME,
300 POWER_SUPPLY_PROP_MANUFACTURER,
301 POWER_SUPPLY_PROP_SERIAL_NUMBER,
302 };
303
304 /* --------------------------------------------------------------------------
305 Battery Management
306 -------------------------------------------------------------------------- */
307 struct acpi_offsets {
308 size_t offset; /* offset inside struct acpi_sbs_battery */
309 u8 mode; /* int or string? */
310 };
311
312 static struct acpi_offsets state_offsets[] = {
313 {offsetof(struct acpi_battery, state), 0},
314 {offsetof(struct acpi_battery, rate_now), 0},
315 {offsetof(struct acpi_battery, capacity_now), 0},
316 {offsetof(struct acpi_battery, voltage_now), 0},
317 };
318
319 static struct acpi_offsets info_offsets[] = {
320 {offsetof(struct acpi_battery, power_unit), 0},
321 {offsetof(struct acpi_battery, design_capacity), 0},
322 {offsetof(struct acpi_battery, full_charge_capacity), 0},
323 {offsetof(struct acpi_battery, technology), 0},
324 {offsetof(struct acpi_battery, design_voltage), 0},
325 {offsetof(struct acpi_battery, design_capacity_warning), 0},
326 {offsetof(struct acpi_battery, design_capacity_low), 0},
327 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
328 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
329 {offsetof(struct acpi_battery, model_number), 1},
330 {offsetof(struct acpi_battery, serial_number), 1},
331 {offsetof(struct acpi_battery, type), 1},
332 {offsetof(struct acpi_battery, oem_info), 1},
333 };
334
335 static struct acpi_offsets extended_info_offsets[] = {
336 {offsetof(struct acpi_battery, revision), 0},
337 {offsetof(struct acpi_battery, power_unit), 0},
338 {offsetof(struct acpi_battery, design_capacity), 0},
339 {offsetof(struct acpi_battery, full_charge_capacity), 0},
340 {offsetof(struct acpi_battery, technology), 0},
341 {offsetof(struct acpi_battery, design_voltage), 0},
342 {offsetof(struct acpi_battery, design_capacity_warning), 0},
343 {offsetof(struct acpi_battery, design_capacity_low), 0},
344 {offsetof(struct acpi_battery, cycle_count), 0},
345 {offsetof(struct acpi_battery, measurement_accuracy), 0},
346 {offsetof(struct acpi_battery, max_sampling_time), 0},
347 {offsetof(struct acpi_battery, min_sampling_time), 0},
348 {offsetof(struct acpi_battery, max_averaging_interval), 0},
349 {offsetof(struct acpi_battery, min_averaging_interval), 0},
350 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
351 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
352 {offsetof(struct acpi_battery, model_number), 1},
353 {offsetof(struct acpi_battery, serial_number), 1},
354 {offsetof(struct acpi_battery, type), 1},
355 {offsetof(struct acpi_battery, oem_info), 1},
356 };
357
358 static int extract_package(struct acpi_battery *battery,
359 union acpi_object *package,
360 struct acpi_offsets *offsets, int num)
361 {
362 int i;
363 union acpi_object *element;
364 if (package->type != ACPI_TYPE_PACKAGE)
365 return -EFAULT;
366 for (i = 0; i < num; ++i) {
367 if (package->package.count <= i)
368 return -EFAULT;
369 element = &package->package.elements[i];
370 if (offsets[i].mode) {
371 u8 *ptr = (u8 *)battery + offsets[i].offset;
372 if (element->type == ACPI_TYPE_STRING ||
373 element->type == ACPI_TYPE_BUFFER)
374 strncpy(ptr, element->string.pointer, 32);
375 else if (element->type == ACPI_TYPE_INTEGER) {
376 strncpy(ptr, (u8 *)&element->integer.value,
377 sizeof(u64));
378 ptr[sizeof(u64)] = 0;
379 } else
380 *ptr = 0; /* don't have value */
381 } else {
382 int *x = (int *)((u8 *)battery + offsets[i].offset);
383 *x = (element->type == ACPI_TYPE_INTEGER) ?
384 element->integer.value : -1;
385 }
386 }
387 return 0;
388 }
389
390 static int acpi_battery_get_status(struct acpi_battery *battery)
391 {
392 if (acpi_bus_get_status(battery->device)) {
393 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
394 return -ENODEV;
395 }
396 return 0;
397 }
398
399 static int acpi_battery_get_info(struct acpi_battery *battery)
400 {
401 int result = -EFAULT;
402 acpi_status status = 0;
403 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags) ?
404 "_BIX" : "_BIF";
405
406 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
407
408 if (!acpi_battery_present(battery))
409 return 0;
410 mutex_lock(&battery->lock);
411 status = acpi_evaluate_object(battery->device->handle, name,
412 NULL, &buffer);
413 mutex_unlock(&battery->lock);
414
415 if (ACPI_FAILURE(status)) {
416 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
417 return -ENODEV;
418 }
419 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
420 result = extract_package(battery, buffer.pointer,
421 extended_info_offsets,
422 ARRAY_SIZE(extended_info_offsets));
423 else
424 result = extract_package(battery, buffer.pointer,
425 info_offsets, ARRAY_SIZE(info_offsets));
426 kfree(buffer.pointer);
427 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
428 battery->full_charge_capacity = battery->design_capacity;
429 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
430 battery->power_unit && battery->design_voltage) {
431 battery->design_capacity = battery->design_capacity *
432 10000 / battery->design_voltage;
433 battery->full_charge_capacity = battery->full_charge_capacity *
434 10000 / battery->design_voltage;
435 battery->design_capacity_warning =
436 battery->design_capacity_warning *
437 10000 / battery->design_voltage;
438 /* Curiously, design_capacity_low, unlike the rest of them,
439 is correct. */
440 /* capacity_granularity_* equal 1 on the systems tested, so
441 it's impossible to tell if they would need an adjustment
442 or not if their values were higher. */
443 }
444 return result;
445 }
446
447 static int acpi_battery_get_state(struct acpi_battery *battery)
448 {
449 int result = 0;
450 acpi_status status = 0;
451 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
452
453 if (!acpi_battery_present(battery))
454 return 0;
455
456 if (battery->update_time &&
457 time_before(jiffies, battery->update_time +
458 msecs_to_jiffies(cache_time)))
459 return 0;
460
461 mutex_lock(&battery->lock);
462 status = acpi_evaluate_object(battery->device->handle, "_BST",
463 NULL, &buffer);
464 mutex_unlock(&battery->lock);
465
466 if (ACPI_FAILURE(status)) {
467 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
468 return -ENODEV;
469 }
470
471 result = extract_package(battery, buffer.pointer,
472 state_offsets, ARRAY_SIZE(state_offsets));
473 battery->update_time = jiffies;
474 kfree(buffer.pointer);
475
476 /* For buggy DSDTs that report negative 16-bit values for either
477 * charging or discharging current and/or report 0 as 65536
478 * due to bad math.
479 */
480 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
481 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
482 (s16)(battery->rate_now) < 0) {
483 battery->rate_now = abs((s16)battery->rate_now);
484 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
485 " invalid.\n");
486 }
487
488 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
489 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
490 battery->capacity_now = (battery->capacity_now *
491 battery->full_charge_capacity) / 100;
492 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
493 battery->power_unit && battery->design_voltage) {
494 battery->capacity_now = battery->capacity_now *
495 10000 / battery->design_voltage;
496 }
497 return result;
498 }
499
500 static int acpi_battery_set_alarm(struct acpi_battery *battery)
501 {
502 acpi_status status = 0;
503
504 if (!acpi_battery_present(battery) ||
505 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
506 return -ENODEV;
507
508 mutex_lock(&battery->lock);
509 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
510 battery->alarm);
511 mutex_unlock(&battery->lock);
512
513 if (ACPI_FAILURE(status))
514 return -ENODEV;
515
516 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
517 return 0;
518 }
519
520 static int acpi_battery_init_alarm(struct acpi_battery *battery)
521 {
522 /* See if alarms are supported, and if so, set default */
523 if (!acpi_has_method(battery->device->handle, "_BTP")) {
524 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
525 return 0;
526 }
527 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
528 if (!battery->alarm)
529 battery->alarm = battery->design_capacity_warning;
530 return acpi_battery_set_alarm(battery);
531 }
532
533 static ssize_t acpi_battery_alarm_show(struct device *dev,
534 struct device_attribute *attr,
535 char *buf)
536 {
537 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
538 return sprintf(buf, "%d\n", battery->alarm * 1000);
539 }
540
541 static ssize_t acpi_battery_alarm_store(struct device *dev,
542 struct device_attribute *attr,
543 const char *buf, size_t count)
544 {
545 unsigned long x;
546 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
547 if (sscanf(buf, "%ld\n", &x) == 1)
548 battery->alarm = x/1000;
549 if (acpi_battery_present(battery))
550 acpi_battery_set_alarm(battery);
551 return count;
552 }
553
554 static struct device_attribute alarm_attr = {
555 .attr = {.name = "alarm", .mode = 0644},
556 .show = acpi_battery_alarm_show,
557 .store = acpi_battery_alarm_store,
558 };
559
560 static int sysfs_add_battery(struct acpi_battery *battery)
561 {
562 int result;
563
564 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
565 battery->bat.properties = charge_battery_props;
566 battery->bat.num_properties =
567 ARRAY_SIZE(charge_battery_props);
568 } else {
569 battery->bat.properties = energy_battery_props;
570 battery->bat.num_properties =
571 ARRAY_SIZE(energy_battery_props);
572 }
573
574 battery->bat.name = acpi_device_bid(battery->device);
575 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
576 battery->bat.get_property = acpi_battery_get_property;
577
578 result = power_supply_register(&battery->device->dev, &battery->bat);
579 if (result)
580 return result;
581 return device_create_file(battery->bat.dev, &alarm_attr);
582 }
583
584 static void sysfs_remove_battery(struct acpi_battery *battery)
585 {
586 mutex_lock(&battery->sysfs_lock);
587 if (!battery->bat.dev) {
588 mutex_unlock(&battery->sysfs_lock);
589 return;
590 }
591
592 device_remove_file(battery->bat.dev, &alarm_attr);
593 power_supply_unregister(&battery->bat);
594 battery->bat.dev = NULL;
595 mutex_unlock(&battery->sysfs_lock);
596 }
597
598 static void find_battery(const struct dmi_header *dm, void *private)
599 {
600 struct acpi_battery *battery = (struct acpi_battery *)private;
601 /* Note: the hardcoded offsets below have been extracted from
602 the source code of dmidecode. */
603 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
604 const u8 *dmi_data = (const u8 *)(dm + 1);
605 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
606 if (dm->length >= 18)
607 dmi_capacity *= dmi_data[17];
608 if (battery->design_capacity * battery->design_voltage / 1000
609 != dmi_capacity &&
610 battery->design_capacity * 10 == dmi_capacity)
611 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
612 &battery->flags);
613 }
614 }
615
616 /*
617 * According to the ACPI spec, some kinds of primary batteries can
618 * report percentage battery remaining capacity directly to OS.
619 * In this case, it reports the Last Full Charged Capacity == 100
620 * and BatteryPresentRate == 0xFFFFFFFF.
621 *
622 * Now we found some battery reports percentage remaining capacity
623 * even if it's rechargeable.
624 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
625 *
626 * Handle this correctly so that they won't break userspace.
627 */
628 static void acpi_battery_quirks(struct acpi_battery *battery)
629 {
630 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
631 return;
632
633 if (battery->full_charge_capacity == 100 &&
634 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
635 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
636 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
637 battery->full_charge_capacity = battery->design_capacity;
638 battery->capacity_now = (battery->capacity_now *
639 battery->full_charge_capacity) / 100;
640 }
641
642 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
643 return;
644
645 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
646 const char *s;
647 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
648 if (s && !strnicmp(s, "ThinkPad", 8)) {
649 dmi_walk(find_battery, battery);
650 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
651 &battery->flags) &&
652 battery->design_voltage) {
653 battery->design_capacity =
654 battery->design_capacity *
655 10000 / battery->design_voltage;
656 battery->full_charge_capacity =
657 battery->full_charge_capacity *
658 10000 / battery->design_voltage;
659 battery->design_capacity_warning =
660 battery->design_capacity_warning *
661 10000 / battery->design_voltage;
662 battery->capacity_now = battery->capacity_now *
663 10000 / battery->design_voltage;
664 }
665 }
666 }
667 }
668
669 static int acpi_battery_update(struct acpi_battery *battery)
670 {
671 int result, old_present = acpi_battery_present(battery);
672 result = acpi_battery_get_status(battery);
673 if (result)
674 return result;
675 if (!acpi_battery_present(battery)) {
676 sysfs_remove_battery(battery);
677 battery->update_time = 0;
678 return 0;
679 }
680 if (!battery->update_time ||
681 old_present != acpi_battery_present(battery)) {
682 result = acpi_battery_get_info(battery);
683 if (result)
684 return result;
685 acpi_battery_init_alarm(battery);
686 }
687 if (!battery->bat.dev) {
688 result = sysfs_add_battery(battery);
689 if (result)
690 return result;
691 }
692 result = acpi_battery_get_state(battery);
693 acpi_battery_quirks(battery);
694 return result;
695 }
696
697 static void acpi_battery_refresh(struct acpi_battery *battery)
698 {
699 int power_unit;
700
701 if (!battery->bat.dev)
702 return;
703
704 power_unit = battery->power_unit;
705
706 acpi_battery_get_info(battery);
707
708 if (power_unit == battery->power_unit)
709 return;
710
711 /* The battery has changed its reporting units. */
712 sysfs_remove_battery(battery);
713 sysfs_add_battery(battery);
714 }
715
716 /* --------------------------------------------------------------------------
717 Driver Interface
718 -------------------------------------------------------------------------- */
719
720 static void acpi_battery_notify(struct acpi_device *device, u32 event)
721 {
722 struct acpi_battery *battery = acpi_driver_data(device);
723 struct device *old;
724
725 if (!battery)
726 return;
727 old = battery->bat.dev;
728 if (event == ACPI_BATTERY_NOTIFY_INFO)
729 acpi_battery_refresh(battery);
730 acpi_battery_update(battery);
731 acpi_bus_generate_netlink_event(device->pnp.device_class,
732 dev_name(&device->dev), event,
733 acpi_battery_present(battery));
734 /* acpi_battery_update could remove power_supply object */
735 if (old && battery->bat.dev)
736 power_supply_changed(&battery->bat);
737 }
738
739 static int battery_notify(struct notifier_block *nb,
740 unsigned long mode, void *_unused)
741 {
742 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
743 pm_nb);
744 switch (mode) {
745 case PM_POST_HIBERNATION:
746 case PM_POST_SUSPEND:
747 if (battery->bat.dev) {
748 sysfs_remove_battery(battery);
749 sysfs_add_battery(battery);
750 }
751 break;
752 }
753
754 return 0;
755 }
756
757 static int acpi_battery_add(struct acpi_device *device)
758 {
759 int result = 0;
760 struct acpi_battery *battery = NULL;
761
762 if (!device)
763 return -EINVAL;
764 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
765 if (!battery)
766 return -ENOMEM;
767 battery->device = device;
768 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
769 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
770 device->driver_data = battery;
771 mutex_init(&battery->lock);
772 mutex_init(&battery->sysfs_lock);
773 if (acpi_has_method(battery->device->handle, "_BIX"))
774 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
775 result = acpi_battery_update(battery);
776 if (result)
777 goto fail;
778
779 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
780 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
781 device->status.battery_present ? "present" : "absent");
782
783 battery->pm_nb.notifier_call = battery_notify;
784 register_pm_notifier(&battery->pm_nb);
785
786 return result;
787
788 fail:
789 sysfs_remove_battery(battery);
790 mutex_destroy(&battery->lock);
791 mutex_destroy(&battery->sysfs_lock);
792 kfree(battery);
793 return result;
794 }
795
796 static int acpi_battery_remove(struct acpi_device *device)
797 {
798 struct acpi_battery *battery = NULL;
799
800 if (!device || !acpi_driver_data(device))
801 return -EINVAL;
802 battery = acpi_driver_data(device);
803 unregister_pm_notifier(&battery->pm_nb);
804 sysfs_remove_battery(battery);
805 mutex_destroy(&battery->lock);
806 mutex_destroy(&battery->sysfs_lock);
807 kfree(battery);
808 return 0;
809 }
810
811 #ifdef CONFIG_PM_SLEEP
812 /* this is needed to learn about changes made in suspended state */
813 static int acpi_battery_resume(struct device *dev)
814 {
815 struct acpi_battery *battery;
816
817 if (!dev)
818 return -EINVAL;
819
820 battery = acpi_driver_data(to_acpi_device(dev));
821 if (!battery)
822 return -EINVAL;
823
824 battery->update_time = 0;
825 acpi_battery_update(battery);
826 return 0;
827 }
828 #endif
829
830 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
831
832 static struct acpi_driver acpi_battery_driver = {
833 .name = "battery",
834 .class = ACPI_BATTERY_CLASS,
835 .ids = battery_device_ids,
836 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
837 .ops = {
838 .add = acpi_battery_add,
839 .remove = acpi_battery_remove,
840 .notify = acpi_battery_notify,
841 },
842 .drv.pm = &acpi_battery_pm,
843 };
844
845 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
846 {
847 if (acpi_disabled)
848 return;
849 acpi_bus_register_driver(&acpi_battery_driver);
850 }
851
852 static int __init acpi_battery_init(void)
853 {
854 async_schedule(acpi_battery_init_async, NULL);
855 return 0;
856 }
857
858 static void __exit acpi_battery_exit(void)
859 {
860 acpi_bus_unregister_driver(&acpi_battery_driver);
861 }
862
863 module_init(acpi_battery_init);
864 module_exit(acpi_battery_exit);
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