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[mirror_ubuntu-artful-kernel.git] / drivers / acpi / battery.c
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1da177e4 1/*
aa650bbd 2 * battery.c - ACPI Battery Driver (Revision: 2.0)
1da177e4 3 *
aa650bbd
AS		 4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
1da177e4
LT		 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>
f1d4661a 32#include <linux/jiffies.h>
0f66af53 33#include <linux/async.h>
bc76f90b 34#include <linux/dmi.h>
5a0e3ad6 35#include <linux/slab.h>
25be5821 36#include <linux/suspend.h>
4000e626 37#include <asm/unaligned.h>
d7380965 38
1da177e4
LT		 39#include <acpi/acpi_bus.h>
40#include <acpi/acpi_drivers.h>
d7380965
AS		 41#include <linux/power_supply.h>
42
a192a958
LB		 43#define PREFIX "ACPI: "
44
1da177e4
LT		 45#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
46
1da177e4 47#define ACPI_BATTERY_CLASS "battery"
1da177e4 48#define ACPI_BATTERY_DEVICE_NAME "Battery"
1da177e4
LT		 49#define ACPI_BATTERY_NOTIFY_STATUS 0x80
50#define ACPI_BATTERY_NOTIFY_INFO 0x81
c67fcd67 51#define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
1da177e4 52
ae6f6187
LT		 53/* Battery power unit: 0 means mW, 1 means mA */
54#define ACPI_BATTERY_POWER_UNIT_MA 1
55
1da177e4 56#define _COMPONENT ACPI_BATTERY_COMPONENT
b6ce4083 57
f52fd66d 58ACPI_MODULE_NAME("battery");
1da177e4 59
f52fd66d 60MODULE_AUTHOR("Paul Diefenbaugh");
aa650bbd 61MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
7cda93e0 62MODULE_DESCRIPTION("ACPI Battery Driver");
1da177e4
LT		 63MODULE_LICENSE("GPL");
64
f1d4661a
AS		 65static unsigned int cache_time = 1000;
66module_param(cache_time, uint, 0644);
67MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
b6ce4083 68
1ba90e3a
TR		 69static const struct acpi_device_id battery_device_ids[] = {
70 {"PNP0C0A", 0},
71 {"", 0},
72};
1ba90e3a 73
aa650bbd 74MODULE_DEVICE_TABLE(acpi, battery_device_ids);
1da177e4 75
7b3bcc4a
AS		 76enum {
77 ACPI_BATTERY_ALARM_PRESENT,
c67fcd67 78 ACPI_BATTERY_XINFO_PRESENT,
557d5868 79 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
4000e626
KI		 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,
7b3bcc4a 92};
78490d82 93
1da177e4 94struct acpi_battery {
038fdea2 95 struct mutex lock;
69d94ec6 96 struct mutex sysfs_lock;
d7380965 97 struct power_supply bat;
f1d4661a 98 struct acpi_device *device;
25be5821 99 struct notifier_block pm_nb;
f1d4661a 100 unsigned long update_time;
016d5baa 101 int revision;
7faa144a 102 int rate_now;
d7380965
AS		 103 int capacity_now;
104 int voltage_now;
038fdea2 105 int design_capacity;
d7380965 106 int full_charge_capacity;
038fdea2
AS		 107 int technology;
108 int design_voltage;
109 int design_capacity_warning;
110 int design_capacity_low;
c67fcd67
AS		 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;
038fdea2
AS		 117 int capacity_granularity_1;
118 int capacity_granularity_2;
f1d4661a 119 int alarm;
038fdea2
AS		 120 char model_number[32];
121 char serial_number[32];
122 char type[32];
123 char oem_info[32];
f1d4661a
AS		 124 int state;
125 int power_unit;
7b3bcc4a 126 unsigned long flags;
1da177e4
LT		 127};
128
497888cf 129#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
d7380965 130
efd941f1 131static inline int acpi_battery_present(struct acpi_battery *battery)
b6ce4083 132{
78490d82
AS		 133 return battery->device->status.battery_present;
134}
038fdea2 135
d7380965
AS		 136static 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;
ad40e68b 144 if (!strncasecmp("LI-ION", battery->type, 6))
0bde7eee 145 return POWER_SUPPLY_TECHNOLOGY_LION;
d7380965
AS		 146 if (!strcasecmp("LiP", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_LIPO;
148 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
149}
150
9104476e 151static int acpi_battery_get_state(struct acpi_battery *battery);
b19073a0 152
56f382a0
RH		 153static 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
d7380965
AS		 176static int acpi_battery_get_property(struct power_supply *psy,
177 enum power_supply_property psp,
178 union power_supply_propval *val)
179{
a1b4bd69 180 int ret = 0;
d7380965
AS		 181 struct acpi_battery *battery = to_acpi_battery(psy);
182
9104476e
AS		 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)
d7380965
AS		 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;
56f382a0 194 else if (acpi_battery_is_charged(battery))
d7380965 195 val->intval = POWER_SUPPLY_STATUS_FULL;
4c41d3ad
RD		 196 else
197 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
d7380965
AS		 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;
c67fcd67
AS		 205 case POWER_SUPPLY_PROP_CYCLE_COUNT:
206 val->intval = battery->cycle_count;
207 break;
d7380965 208 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
a1b4bd69
RW		 209 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
210 ret = -ENODEV;
211 else
212 val->intval = battery->design_voltage * 1000;
d7380965
AS		 213 break;
214 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
a1b4bd69
RW		 215 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
216 ret = -ENODEV;
217 else
218 val->intval = battery->voltage_now * 1000;
d7380965
AS		 219 break;
220 case POWER_SUPPLY_PROP_CURRENT_NOW:
7faa144a 221 case POWER_SUPPLY_PROP_POWER_NOW:
a1b4bd69
RW		 222 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
223 ret = -ENODEV;
224 else
225 val->intval = battery->rate_now * 1000;
d7380965
AS		 226 break;
227 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
228 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
a1b4bd69
RW		 229 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
230 ret = -ENODEV;
231 else
232 val->intval = battery->design_capacity * 1000;
d7380965
AS		 233 break;
234 case POWER_SUPPLY_PROP_CHARGE_FULL:
235 case POWER_SUPPLY_PROP_ENERGY_FULL:
a1b4bd69
RW		 236 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
237 ret = -ENODEV;
238 else
239 val->intval = battery->full_charge_capacity * 1000;
d7380965
AS		 240 break;
241 case POWER_SUPPLY_PROP_CHARGE_NOW:
242 case POWER_SUPPLY_PROP_ENERGY_NOW:
a1b4bd69
RW		 243 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
244 ret = -ENODEV;
245 else
246 val->intval = battery->capacity_now * 1000;
d7380965 247 break;
a58e1150 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;
d7380965
AS		 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;
7c2670bb 261 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
262 val->strval = battery->serial_number;
263 break;
d7380965 264 default:
a1b4bd69 265 ret = -EINVAL;
d7380965 266 }
a1b4bd69 267 return ret;
d7380965
AS		 268}
269
270static enum power_supply_property charge_battery_props[] = {
271 POWER_SUPPLY_PROP_STATUS,
272 POWER_SUPPLY_PROP_PRESENT,
273 POWER_SUPPLY_PROP_TECHNOLOGY,
c67fcd67 274 POWER_SUPPLY_PROP_CYCLE_COUNT,
d7380965
AS		 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,
a58e1150 281 POWER_SUPPLY_PROP_CAPACITY,
d7380965
AS		 282 POWER_SUPPLY_PROP_MODEL_NAME,
283 POWER_SUPPLY_PROP_MANUFACTURER,
7c2670bb 284 POWER_SUPPLY_PROP_SERIAL_NUMBER,
d7380965
AS		 285};
286
287static enum power_supply_property energy_battery_props[] = {
288 POWER_SUPPLY_PROP_STATUS,
289 POWER_SUPPLY_PROP_PRESENT,
290 POWER_SUPPLY_PROP_TECHNOLOGY,
c67fcd67 291 POWER_SUPPLY_PROP_CYCLE_COUNT,
d7380965
AS		 292 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
293 POWER_SUPPLY_PROP_VOLTAGE_NOW,
7faa144a 294 POWER_SUPPLY_PROP_POWER_NOW,
d7380965
AS		 295 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
296 POWER_SUPPLY_PROP_ENERGY_FULL,
297 POWER_SUPPLY_PROP_ENERGY_NOW,
a58e1150 298 POWER_SUPPLY_PROP_CAPACITY,
d7380965
AS		 299 POWER_SUPPLY_PROP_MODEL_NAME,
300 POWER_SUPPLY_PROP_MANUFACTURER,
7c2670bb 301 POWER_SUPPLY_PROP_SERIAL_NUMBER,
d7380965
AS		 302};
303
78490d82
AS		 304/* --------------------------------------------------------------------------
305 Battery Management
306 -------------------------------------------------------------------------- */
038fdea2
AS		 307struct acpi_offsets {
308 size_t offset; /* offset inside struct acpi_sbs_battery */
309 u8 mode; /* int or string? */
310};
b6ce4083 311
038fdea2
AS		 312static struct acpi_offsets state_offsets[] = {
313 {offsetof(struct acpi_battery, state), 0},
7faa144a 314 {offsetof(struct acpi_battery, rate_now), 0},
d7380965
AS		 315 {offsetof(struct acpi_battery, capacity_now), 0},
316 {offsetof(struct acpi_battery, voltage_now), 0},
038fdea2 317};
b6ce4083 318
038fdea2
AS		 319static struct acpi_offsets info_offsets[] = {
320 {offsetof(struct acpi_battery, power_unit), 0},
321 {offsetof(struct acpi_battery, design_capacity), 0},
d7380965 322 {offsetof(struct acpi_battery, full_charge_capacity), 0},
038fdea2
AS		 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};
b6ce4083 334
c67fcd67 335static struct acpi_offsets extended_info_offsets[] = {
016d5baa 336 {offsetof(struct acpi_battery, revision), 0},
c67fcd67
AS		 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
038fdea2
AS		 358static int extract_package(struct acpi_battery *battery,
359 union acpi_object *package,
360 struct acpi_offsets *offsets, int num)
361{
106449e8 362 int i;
038fdea2
AS		 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) {
106449e8
AS		 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,
439913ff
LM		 377 sizeof(u64));
378 ptr[sizeof(u64)] = 0;
b8a1bdb1
AS		 379 } else
380 *ptr = 0; /* don't have value */
038fdea2 381 } else {
b8a1bdb1
AS		 382 int *x = (int *)((u8 *)battery + offsets[i].offset);
383 *x = (element->type == ACPI_TYPE_INTEGER) ?
384 element->integer.value : -1;
038fdea2 385 }
b6ce4083 386 }
b6ce4083
VL		 387 return 0;
388}
389
390static int acpi_battery_get_status(struct acpi_battery *battery)
391{
aa650bbd 392 if (acpi_bus_get_status(battery->device)) {
b6ce4083
VL		 393 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
394 return -ENODEV;
395 }
aa650bbd 396 return 0;
b6ce4083
VL		 397}
398
399static int acpi_battery_get_info(struct acpi_battery *battery)
1da177e4 400{
aa650bbd 401 int result = -EFAULT;
4be44fcd 402 acpi_status status = 0;
0f4c6547 403 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags) ?
c67fcd67
AS		 404 "_BIX" : "_BIF";
405
4be44fcd 406 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1da177e4 407
b6ce4083
VL		 408 if (!acpi_battery_present(battery))
409 return 0;
038fdea2 410 mutex_lock(&battery->lock);
c67fcd67
AS		 411 status = acpi_evaluate_object(battery->device->handle, name,
412 NULL, &buffer);
038fdea2 413 mutex_unlock(&battery->lock);
aa650bbd 414
1da177e4 415 if (ACPI_FAILURE(status)) {
c67fcd67 416 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
d550d98d 417 return -ENODEV;
1da177e4 418 }
c67fcd67
AS		 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));
78490d82 426 kfree(buffer.pointer);
557d5868
ZR		 427 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
428 battery->full_charge_capacity = battery->design_capacity;
4000e626
KI		 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 }
d550d98d 444 return result;
1da177e4
LT		 445}
446
b6ce4083 447static int acpi_battery_get_state(struct acpi_battery *battery)
1da177e4 448{
4be44fcd
LB		 449 int result = 0;
450 acpi_status status = 0;
451 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1da177e4 452
b6ce4083
VL		 453 if (!acpi_battery_present(battery))
454 return 0;
1da177e4 455
f1d4661a
AS		 456 if (battery->update_time &&
457 time_before(jiffies, battery->update_time +
458 msecs_to_jiffies(cache_time)))
459 return 0;
460
038fdea2 461 mutex_lock(&battery->lock);
f1d4661a 462 status = acpi_evaluate_object(battery->device->handle, "_BST",
038fdea2
AS		 463 NULL, &buffer);
464 mutex_unlock(&battery->lock);
5b31d895 465
1da177e4 466 if (ACPI_FAILURE(status)) {
a6fc6720 467 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
d550d98d 468 return -ENODEV;
1da177e4 469 }
aa650bbd 470
038fdea2
AS		 471 result = extract_package(battery, buffer.pointer,
472 state_offsets, ARRAY_SIZE(state_offsets));
f1d4661a 473 battery->update_time = jiffies;
78490d82 474 kfree(buffer.pointer);
bc76f90b 475
55003b21
LT		 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) {
bc76f90b 483 battery->rate_now = abs((s16)battery->rate_now);
55003b21
LT		 484 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
485 " invalid.\n");
486 }
bc76f90b 487
557d5868
ZR		 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;
4000e626
KI		 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 }
b6ce4083
VL		 497 return result;
498}
1da177e4 499
aa650bbd 500static int acpi_battery_set_alarm(struct acpi_battery *battery)
1da177e4 501{
4be44fcd 502 acpi_status status = 0;
1da177e4 503
c67fcd67 504 if (!acpi_battery_present(battery) ||
7b3bcc4a 505 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
d550d98d 506 return -ENODEV;
1da177e4 507
038fdea2 508 mutex_lock(&battery->lock);
0db98202
JL		 509 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
510 battery->alarm);
038fdea2 511 mutex_unlock(&battery->lock);
aa650bbd 512
1da177e4 513 if (ACPI_FAILURE(status))
d550d98d 514 return -ENODEV;
1da177e4 515
aa650bbd 516 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
d550d98d 517 return 0;
1da177e4
LT		 518}
519
b6ce4083 520static int acpi_battery_init_alarm(struct acpi_battery *battery)
1da177e4 521{
b6ce4083 522 /* See if alarms are supported, and if so, set default */
952c63e9 523 if (!acpi_has_method(battery->device->handle, "_BTP")) {
7b3bcc4a 524 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
f1d4661a 525 return 0;
b6ce4083 526 }
7b3bcc4a 527 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
f1d4661a
AS		 528 if (!battery->alarm)
529 battery->alarm = battery->design_capacity_warning;
aa650bbd 530 return acpi_battery_set_alarm(battery);
b6ce4083 531}
1da177e4 532
508df92d
AB		 533static 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
541static 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
554static struct device_attribute alarm_attr = {
01e8ef11 555 .attr = {.name = "alarm", .mode = 0644},
508df92d
AB		 556 .show = acpi_battery_alarm_show,
557 .store = acpi_battery_alarm_store,
558};
559
560static int sysfs_add_battery(struct acpi_battery *battery)
561{
562 int result;
563
ae6f6187 564 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
508df92d
AB		 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
584static void sysfs_remove_battery(struct acpi_battery *battery)
585{
69d94ec6 586 mutex_lock(&battery->sysfs_lock);
9c921c22 587 if (!battery->bat.dev) {
69d94ec6 588 mutex_unlock(&battery->sysfs_lock);
508df92d 589 return;
9c921c22
LT		 590 }
591
508df92d
AB		 592 device_remove_file(battery->bat.dev, &alarm_attr);
593 power_supply_unregister(&battery->bat);
9104476e 594 battery->bat.dev = NULL;
69d94ec6 595 mutex_unlock(&battery->sysfs_lock);
bc76f90b
HM		 596}
597
4000e626
KI		 598static 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
557d5868
ZR		 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 */
7b78622d 628static void acpi_battery_quirks(struct acpi_battery *battery)
557d5868
ZR		 629{
630 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
0f4c6547 631 return;
557d5868 632
0f4c6547
NM		 633 if (battery->full_charge_capacity == 100 &&
634 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
635 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
557d5868
ZR		 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 }
4000e626
KI		 641
642 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
0f4c6547 643 return;
4000e626
KI		 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 }
557d5868
ZR		 667}
668
f1d4661a 669static int acpi_battery_update(struct acpi_battery *battery)
b6ce4083 670{
50b17851 671 int result, old_present = acpi_battery_present(battery);
97749cd9 672 result = acpi_battery_get_status(battery);
508df92d 673 if (result)
b6ce4083 674 return result;
508df92d
AB		 675 if (!acpi_battery_present(battery)) {
676 sysfs_remove_battery(battery);
97749cd9 677 battery->update_time = 0;
508df92d 678 return 0;
b6ce4083 679 }
50b17851
AS		 680 if (!battery->update_time ||
681 old_present != acpi_battery_present(battery)) {
97749cd9
AS		 682 result = acpi_battery_get_info(battery);
683 if (result)
684 return result;
685 acpi_battery_init_alarm(battery);
686 }
eb03cb02
SH		 687 if (!battery->bat.dev) {
688 result = sysfs_add_battery(battery);
689 if (result)
690 return result;
691 }
557d5868 692 result = acpi_battery_get_state(battery);
7b78622d 693 acpi_battery_quirks(battery);
557d5868 694 return result;
4bd35cdb
VL		 695}
696
da8aeb92
RW		 697static void acpi_battery_refresh(struct acpi_battery *battery)
698{
c5971456
AW		 699 int power_unit;
700
da8aeb92
RW		 701 if (!battery->bat.dev)
702 return;
703
c5971456
AW		 704 power_unit = battery->power_unit;
705
da8aeb92 706 acpi_battery_get_info(battery);
c5971456
AW		 707
708 if (power_unit == battery->power_unit)
709 return;
710
711 /* The battery has changed its reporting units. */
da8aeb92
RW		 712 sysfs_remove_battery(battery);
713 sysfs_add_battery(battery);
714}
715
1da177e4
LT		 716/* --------------------------------------------------------------------------
717 Driver Interface
718 -------------------------------------------------------------------------- */
719
d9406691 720static void acpi_battery_notify(struct acpi_device *device, u32 event)
1da177e4 721{
d9406691 722 struct acpi_battery *battery = acpi_driver_data(device);
153e500f 723 struct device *old;
d9406691 724
1da177e4 725 if (!battery)
d550d98d 726 return;
153e500f 727 old = battery->bat.dev;
da8aeb92
RW		 728 if (event == ACPI_BATTERY_NOTIFY_INFO)
729 acpi_battery_refresh(battery);
f1d4661a 730 acpi_battery_update(battery);
f1d4661a 731 acpi_bus_generate_netlink_event(device->pnp.device_class,
0794469d 732 dev_name(&device->dev), event,
9ea7d575 733 acpi_battery_present(battery));
2345baf4 734 /* acpi_battery_update could remove power_supply object */
153e500f 735 if (old && battery->bat.dev)
f79e1cec 736 power_supply_changed(&battery->bat);
1da177e4
LT		 737}
738
25be5821
KM		 739static 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) {
d5a5911b 745 case PM_POST_HIBERNATION:
25be5821 746 case PM_POST_SUSPEND:
6e17fb6a
LT		 747 if (battery->bat.dev) {
748 sysfs_remove_battery(battery);
749 sysfs_add_battery(battery);
750 }
25be5821
KM		 751 break;
752 }
753
754 return 0;
755}
756
4be44fcd 757static int acpi_battery_add(struct acpi_device *device)
1da177e4 758{
4be44fcd 759 int result = 0;
4be44fcd 760 struct acpi_battery *battery = NULL;
952c63e9 761
1da177e4 762 if (!device)
d550d98d 763 return -EINVAL;
36bcbec7 764 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1da177e4 765 if (!battery)
d550d98d 766 return -ENOMEM;
145def84 767 battery->device = device;
1da177e4
LT		 768 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
769 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
db89b4f0 770 device->driver_data = battery;
038fdea2 771 mutex_init(&battery->lock);
69d94ec6 772 mutex_init(&battery->sysfs_lock);
952c63e9 773 if (acpi_has_method(battery->device->handle, "_BIX"))
c67fcd67 774 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
eb03cb02
SH		 775 result = acpi_battery_update(battery);
776 if (result)
777 goto fail;
25be5821 778
e80bba4b
SH		 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
25be5821
KM		 783 battery->pm_nb.notifier_call = battery_notify;
784 register_pm_notifier(&battery->pm_nb);
785
d550d98d 786 return result;
e80bba4b
SH		 787
788fail:
789 sysfs_remove_battery(battery);
790 mutex_destroy(&battery->lock);
69d94ec6 791 mutex_destroy(&battery->sysfs_lock);
e80bba4b
SH		 792 kfree(battery);
793 return result;
1da177e4
LT		 794}
795
51fac838 796static int acpi_battery_remove(struct acpi_device *device)
1da177e4 797{
4be44fcd 798 struct acpi_battery *battery = NULL;
1da177e4 799
1da177e4 800 if (!device || !acpi_driver_data(device))
d550d98d 801 return -EINVAL;
50dd0969 802 battery = acpi_driver_data(device);
25be5821 803 unregister_pm_notifier(&battery->pm_nb);
508df92d 804 sysfs_remove_battery(battery);
038fdea2 805 mutex_destroy(&battery->lock);
69d94ec6 806 mutex_destroy(&battery->sysfs_lock);
1da177e4 807 kfree(battery);
d550d98d 808 return 0;
1da177e4
LT		 809}
810
90692404 811#ifdef CONFIG_PM_SLEEP
34c4415a 812/* this is needed to learn about changes made in suspended state */
a6f50dc8 813static int acpi_battery_resume(struct device *dev)
34c4415a
JK		 814{
815 struct acpi_battery *battery;
a6f50dc8
RW		 816
817 if (!dev)
34c4415a 818 return -EINVAL;
a6f50dc8
RW		 819
820 battery = acpi_driver_data(to_acpi_device(dev));
821 if (!battery)
822 return -EINVAL;
823
f1d4661a 824 battery->update_time = 0;
508df92d 825 acpi_battery_update(battery);
b6ce4083 826 return 0;
34c4415a 827}
90692404 828#endif
34c4415a 829
a6f50dc8
RW		 830static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
831
aa650bbd
AS		 832static struct acpi_driver acpi_battery_driver = {
833 .name = "battery",
834 .class = ACPI_BATTERY_CLASS,
835 .ids = battery_device_ids,
d9406691 836 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
aa650bbd
AS		 837 .ops = {
838 .add = acpi_battery_add,
aa650bbd 839 .remove = acpi_battery_remove,
d9406691 840 .notify = acpi_battery_notify,
aa650bbd 841 },
a6f50dc8 842 .drv.pm = &acpi_battery_pm,
aa650bbd
AS		 843};
844
b0cbc861 845static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1da177e4 846{
4d8316d5 847 if (acpi_disabled)
0f66af53 848 return;
1e2d9cdf 849 acpi_bus_register_driver(&acpi_battery_driver);
0f66af53
AV		 850}
851
852static int __init acpi_battery_init(void)
853{
854 async_schedule(acpi_battery_init_async, NULL);
d550d98d 855 return 0;
1da177e4
LT		 856}
857
4be44fcd 858static void __exit acpi_battery_exit(void)
1da177e4 859{
1da177e4 860 acpi_bus_unregister_driver(&acpi_battery_driver);
1da177e4
LT		 861}
862
1da177e4
LT		 863module_init(acpi_battery_init);
864module_exit(acpi_battery_exit);
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