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bpf: Prevent memory disambiguation attack
[linux/fpc-iii.git] / drivers / acpi / battery.c
blobf2eb6c37ea0aa9aed03f562883634add68078f55
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 <linux/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
62 ACPI_MODULE_NAME("battery");
63
64 MODULE_AUTHOR("Paul Diefenbaugh");
65 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
66 MODULE_DESCRIPTION("ACPI Battery Driver");
67 MODULE_LICENSE("GPL");
68
69 static async_cookie_t async_cookie;
70 static bool battery_driver_registered;
71 static int battery_bix_broken_package;
72 static int battery_notification_delay_ms;
73 static unsigned int cache_time = 1000;
74 module_param(cache_time, uint, 0644);
75 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
76
77 #ifdef CONFIG_ACPI_PROCFS_POWER
78 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
79 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
80
81 enum acpi_battery_files {
82 info_tag = 0,
83 state_tag,
84 alarm_tag,
85 ACPI_BATTERY_NUMFILES,
86 };
87
88 #endif
89
90 static const struct acpi_device_id battery_device_ids[] = {
91 {"PNP0C0A", 0},
92 {"", 0},
93 };
94
95 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
96
97 /* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
98 static const char * const acpi_battery_blacklist[] = {
99 "INT33F4", /* X-Powers AXP288 PMIC */
100 };
101
102 enum {
103 ACPI_BATTERY_ALARM_PRESENT,
104 ACPI_BATTERY_XINFO_PRESENT,
105 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
106 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
107 switches between mWh and mAh depending on whether the system
108 is running on battery or not. When mAh is the unit, most
109 reported values are incorrect and need to be adjusted by
110 10000/design_voltage. Verified on x201, t410, t410s, and x220.
111 Pre-2010 and 2012 models appear to always report in mWh and
112 are thus unaffected (tested with t42, t61, t500, x200, x300,
113 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
114 the 2011 models that fixes the issue (tested on x220 with a
115 post-1.29 BIOS), but as of Nov. 2012, no such update is
116 available for the 2010 models. */
117 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
118 };
119
120 struct acpi_battery {
121 struct mutex lock;
122 struct mutex sysfs_lock;
123 struct power_supply *bat;
124 struct power_supply_desc bat_desc;
125 struct acpi_device *device;
126 struct notifier_block pm_nb;
127 unsigned long update_time;
128 int revision;
129 int rate_now;
130 int capacity_now;
131 int voltage_now;
132 int design_capacity;
133 int full_charge_capacity;
134 int technology;
135 int design_voltage;
136 int design_capacity_warning;
137 int design_capacity_low;
138 int cycle_count;
139 int measurement_accuracy;
140 int max_sampling_time;
141 int min_sampling_time;
142 int max_averaging_interval;
143 int min_averaging_interval;
144 int capacity_granularity_1;
145 int capacity_granularity_2;
146 int alarm;
147 char model_number[32];
148 char serial_number[32];
149 char type[32];
150 char oem_info[32];
151 int state;
152 int power_unit;
153 unsigned long flags;
154 };
155
156 #define to_acpi_battery(x) power_supply_get_drvdata(x)
157
158 static inline int acpi_battery_present(struct acpi_battery *battery)
159 {
160 return battery->device->status.battery_present;
161 }
162
163 static int acpi_battery_technology(struct acpi_battery *battery)
164 {
165 if (!strcasecmp("NiCd", battery->type))
166 return POWER_SUPPLY_TECHNOLOGY_NiCd;
167 if (!strcasecmp("NiMH", battery->type))
168 return POWER_SUPPLY_TECHNOLOGY_NiMH;
169 if (!strcasecmp("LION", battery->type))
170 return POWER_SUPPLY_TECHNOLOGY_LION;
171 if (!strncasecmp("LI-ION", battery->type, 6))
172 return POWER_SUPPLY_TECHNOLOGY_LION;
173 if (!strcasecmp("LiP", battery->type))
174 return POWER_SUPPLY_TECHNOLOGY_LIPO;
175 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
176 }
177
178 static int acpi_battery_get_state(struct acpi_battery *battery);
179
180 static int acpi_battery_is_charged(struct acpi_battery *battery)
181 {
182 /* charging, discharging or critical low */
183 if (battery->state != 0)
184 return 0;
185
186 /* battery not reporting charge */
187 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
188 battery->capacity_now == 0)
189 return 0;
190
191 /* good batteries update full_charge as the batteries degrade */
192 if (battery->full_charge_capacity == battery->capacity_now)
193 return 1;
194
195 /* fallback to using design values for broken batteries */
196 if (battery->design_capacity == battery->capacity_now)
197 return 1;
198
199 /* we don't do any sort of metric based on percentages */
200 return 0;
201 }
202
203 static int acpi_battery_get_property(struct power_supply *psy,
204 enum power_supply_property psp,
205 union power_supply_propval *val)
206 {
207 int ret = 0;
208 struct acpi_battery *battery = to_acpi_battery(psy);
209
210 if (acpi_battery_present(battery)) {
211 /* run battery update only if it is present */
212 acpi_battery_get_state(battery);
213 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
214 return -ENODEV;
215 switch (psp) {
216 case POWER_SUPPLY_PROP_STATUS:
217 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
218 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
219 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
220 val->intval = POWER_SUPPLY_STATUS_CHARGING;
221 else if (acpi_battery_is_charged(battery))
222 val->intval = POWER_SUPPLY_STATUS_FULL;
223 else
224 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
225 break;
226 case POWER_SUPPLY_PROP_PRESENT:
227 val->intval = acpi_battery_present(battery);
228 break;
229 case POWER_SUPPLY_PROP_TECHNOLOGY:
230 val->intval = acpi_battery_technology(battery);
231 break;
232 case POWER_SUPPLY_PROP_CYCLE_COUNT:
233 val->intval = battery->cycle_count;
234 break;
235 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
236 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
237 ret = -ENODEV;
238 else
239 val->intval = battery->design_voltage * 1000;
240 break;
241 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
242 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
243 ret = -ENODEV;
244 else
245 val->intval = battery->voltage_now * 1000;
246 break;
247 case POWER_SUPPLY_PROP_CURRENT_NOW:
248 case POWER_SUPPLY_PROP_POWER_NOW:
249 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
250 ret = -ENODEV;
251 else
252 val->intval = battery->rate_now * 1000;
253 break;
254 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
255 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
256 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
257 ret = -ENODEV;
258 else
259 val->intval = battery->design_capacity * 1000;
260 break;
261 case POWER_SUPPLY_PROP_CHARGE_FULL:
262 case POWER_SUPPLY_PROP_ENERGY_FULL:
263 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
264 ret = -ENODEV;
265 else
266 val->intval = battery->full_charge_capacity * 1000;
267 break;
268 case POWER_SUPPLY_PROP_CHARGE_NOW:
269 case POWER_SUPPLY_PROP_ENERGY_NOW:
270 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
271 ret = -ENODEV;
272 else
273 val->intval = battery->capacity_now * 1000;
274 break;
275 case POWER_SUPPLY_PROP_CAPACITY:
276 if (battery->capacity_now && battery->full_charge_capacity)
277 val->intval = battery->capacity_now * 100/
278 battery->full_charge_capacity;
279 else
280 val->intval = 0;
281 break;
282 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
283 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
284 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
285 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
286 (battery->capacity_now <= battery->alarm))
287 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
288 else if (acpi_battery_is_charged(battery))
289 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
290 else
291 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
292 break;
293 case POWER_SUPPLY_PROP_MODEL_NAME:
294 val->strval = battery->model_number;
295 break;
296 case POWER_SUPPLY_PROP_MANUFACTURER:
297 val->strval = battery->oem_info;
298 break;
299 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
300 val->strval = battery->serial_number;
301 break;
302 default:
303 ret = -EINVAL;
304 }
305 return ret;
306 }
307
308 static enum power_supply_property charge_battery_props[] = {
309 POWER_SUPPLY_PROP_STATUS,
310 POWER_SUPPLY_PROP_PRESENT,
311 POWER_SUPPLY_PROP_TECHNOLOGY,
312 POWER_SUPPLY_PROP_CYCLE_COUNT,
313 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
314 POWER_SUPPLY_PROP_VOLTAGE_NOW,
315 POWER_SUPPLY_PROP_CURRENT_NOW,
316 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
317 POWER_SUPPLY_PROP_CHARGE_FULL,
318 POWER_SUPPLY_PROP_CHARGE_NOW,
319 POWER_SUPPLY_PROP_CAPACITY,
320 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
321 POWER_SUPPLY_PROP_MODEL_NAME,
322 POWER_SUPPLY_PROP_MANUFACTURER,
323 POWER_SUPPLY_PROP_SERIAL_NUMBER,
324 };
325
326 static enum power_supply_property energy_battery_props[] = {
327 POWER_SUPPLY_PROP_STATUS,
328 POWER_SUPPLY_PROP_PRESENT,
329 POWER_SUPPLY_PROP_TECHNOLOGY,
330 POWER_SUPPLY_PROP_CYCLE_COUNT,
331 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
332 POWER_SUPPLY_PROP_VOLTAGE_NOW,
333 POWER_SUPPLY_PROP_POWER_NOW,
334 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
335 POWER_SUPPLY_PROP_ENERGY_FULL,
336 POWER_SUPPLY_PROP_ENERGY_NOW,
337 POWER_SUPPLY_PROP_CAPACITY,
338 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
339 POWER_SUPPLY_PROP_MODEL_NAME,
340 POWER_SUPPLY_PROP_MANUFACTURER,
341 POWER_SUPPLY_PROP_SERIAL_NUMBER,
342 };
343
344 /* --------------------------------------------------------------------------
345 Battery Management
346 -------------------------------------------------------------------------- */
347 struct acpi_offsets {
348 size_t offset; /* offset inside struct acpi_sbs_battery */
349 u8 mode; /* int or string? */
350 };
351
352 static const struct acpi_offsets state_offsets[] = {
353 {offsetof(struct acpi_battery, state), 0},
354 {offsetof(struct acpi_battery, rate_now), 0},
355 {offsetof(struct acpi_battery, capacity_now), 0},
356 {offsetof(struct acpi_battery, voltage_now), 0},
357 };
358
359 static const struct acpi_offsets info_offsets[] = {
360 {offsetof(struct acpi_battery, power_unit), 0},
361 {offsetof(struct acpi_battery, design_capacity), 0},
362 {offsetof(struct acpi_battery, full_charge_capacity), 0},
363 {offsetof(struct acpi_battery, technology), 0},
364 {offsetof(struct acpi_battery, design_voltage), 0},
365 {offsetof(struct acpi_battery, design_capacity_warning), 0},
366 {offsetof(struct acpi_battery, design_capacity_low), 0},
367 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
368 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
369 {offsetof(struct acpi_battery, model_number), 1},
370 {offsetof(struct acpi_battery, serial_number), 1},
371 {offsetof(struct acpi_battery, type), 1},
372 {offsetof(struct acpi_battery, oem_info), 1},
373 };
374
375 static const struct acpi_offsets extended_info_offsets[] = {
376 {offsetof(struct acpi_battery, revision), 0},
377 {offsetof(struct acpi_battery, power_unit), 0},
378 {offsetof(struct acpi_battery, design_capacity), 0},
379 {offsetof(struct acpi_battery, full_charge_capacity), 0},
380 {offsetof(struct acpi_battery, technology), 0},
381 {offsetof(struct acpi_battery, design_voltage), 0},
382 {offsetof(struct acpi_battery, design_capacity_warning), 0},
383 {offsetof(struct acpi_battery, design_capacity_low), 0},
384 {offsetof(struct acpi_battery, cycle_count), 0},
385 {offsetof(struct acpi_battery, measurement_accuracy), 0},
386 {offsetof(struct acpi_battery, max_sampling_time), 0},
387 {offsetof(struct acpi_battery, min_sampling_time), 0},
388 {offsetof(struct acpi_battery, max_averaging_interval), 0},
389 {offsetof(struct acpi_battery, min_averaging_interval), 0},
390 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
391 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
392 {offsetof(struct acpi_battery, model_number), 1},
393 {offsetof(struct acpi_battery, serial_number), 1},
394 {offsetof(struct acpi_battery, type), 1},
395 {offsetof(struct acpi_battery, oem_info), 1},
396 };
397
398 static int extract_package(struct acpi_battery *battery,
399 union acpi_object *package,
400 const struct acpi_offsets *offsets, int num)
401 {
402 int i;
403 union acpi_object *element;
404 if (package->type != ACPI_TYPE_PACKAGE)
405 return -EFAULT;
406 for (i = 0; i < num; ++i) {
407 if (package->package.count <= i)
408 return -EFAULT;
409 element = &package->package.elements[i];
410 if (offsets[i].mode) {
411 u8 *ptr = (u8 *)battery + offsets[i].offset;
412 if (element->type == ACPI_TYPE_STRING ||
413 element->type == ACPI_TYPE_BUFFER)
414 strncpy(ptr, element->string.pointer, 32);
415 else if (element->type == ACPI_TYPE_INTEGER) {
416 strncpy(ptr, (u8 *)&element->integer.value,
417 sizeof(u64));
418 ptr[sizeof(u64)] = 0;
419 } else
420 *ptr = 0; /* don't have value */
421 } else {
422 int *x = (int *)((u8 *)battery + offsets[i].offset);
423 *x = (element->type == ACPI_TYPE_INTEGER) ?
424 element->integer.value : -1;
425 }
426 }
427 return 0;
428 }
429
430 static int acpi_battery_get_status(struct acpi_battery *battery)
431 {
432 if (acpi_bus_get_status(battery->device)) {
433 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
434 return -ENODEV;
435 }
436 return 0;
437 }
438
439
440 static int extract_battery_info(const int use_bix,
441 struct acpi_battery *battery,
442 const struct acpi_buffer *buffer)
443 {
444 int result = -EFAULT;
445
446 if (use_bix && battery_bix_broken_package)
447 result = extract_package(battery, buffer->pointer,
448 extended_info_offsets + 1,
449 ARRAY_SIZE(extended_info_offsets) - 1);
450 else if (use_bix)
451 result = extract_package(battery, buffer->pointer,
452 extended_info_offsets,
453 ARRAY_SIZE(extended_info_offsets));
454 else
455 result = extract_package(battery, buffer->pointer,
456 info_offsets, ARRAY_SIZE(info_offsets));
457 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
458 battery->full_charge_capacity = battery->design_capacity;
459 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
460 battery->power_unit && battery->design_voltage) {
461 battery->design_capacity = battery->design_capacity *
462 10000 / battery->design_voltage;
463 battery->full_charge_capacity = battery->full_charge_capacity *
464 10000 / battery->design_voltage;
465 battery->design_capacity_warning =
466 battery->design_capacity_warning *
467 10000 / battery->design_voltage;
468 /* Curiously, design_capacity_low, unlike the rest of them,
469 is correct. */
470 /* capacity_granularity_* equal 1 on the systems tested, so
471 it's impossible to tell if they would need an adjustment
472 or not if their values were higher. */
473 }
474 return result;
475 }
476
477 static int acpi_battery_get_info(struct acpi_battery *battery)
478 {
479 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
480 int use_bix;
481 int result = -ENODEV;
482
483 if (!acpi_battery_present(battery))
484 return 0;
485
486
487 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
488 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
489 acpi_status status = AE_ERROR;
490
491 mutex_lock(&battery->lock);
492 status = acpi_evaluate_object(battery->device->handle,
493 use_bix ? "_BIX":"_BIF",
494 NULL, &buffer);
495 mutex_unlock(&battery->lock);
496
497 if (ACPI_FAILURE(status)) {
498 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s",
499 use_bix ? "_BIX":"_BIF"));
500 } else {
501 result = extract_battery_info(use_bix,
502 battery,
503 &buffer);
504
505 kfree(buffer.pointer);
506 break;
507 }
508 }
509
510 if (!result && !use_bix && xinfo)
511 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
512
513 return result;
514 }
515
516 static int acpi_battery_get_state(struct acpi_battery *battery)
517 {
518 int result = 0;
519 acpi_status status = 0;
520 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
521
522 if (!acpi_battery_present(battery))
523 return 0;
524
525 if (battery->update_time &&
526 time_before(jiffies, battery->update_time +
527 msecs_to_jiffies(cache_time)))
528 return 0;
529
530 mutex_lock(&battery->lock);
531 status = acpi_evaluate_object(battery->device->handle, "_BST",
532 NULL, &buffer);
533 mutex_unlock(&battery->lock);
534
535 if (ACPI_FAILURE(status)) {
536 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
537 return -ENODEV;
538 }
539
540 result = extract_package(battery, buffer.pointer,
541 state_offsets, ARRAY_SIZE(state_offsets));
542 battery->update_time = jiffies;
543 kfree(buffer.pointer);
544
545 /* For buggy DSDTs that report negative 16-bit values for either
546 * charging or discharging current and/or report 0 as 65536
547 * due to bad math.
548 */
549 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
550 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
551 (s16)(battery->rate_now) < 0) {
552 battery->rate_now = abs((s16)battery->rate_now);
553 printk_once(KERN_WARNING FW_BUG
554 "battery: (dis)charge rate invalid.\n");
555 }
556
557 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
558 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
559 battery->capacity_now = (battery->capacity_now *
560 battery->full_charge_capacity) / 100;
561 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
562 battery->power_unit && battery->design_voltage) {
563 battery->capacity_now = battery->capacity_now *
564 10000 / battery->design_voltage;
565 }
566 return result;
567 }
568
569 static int acpi_battery_set_alarm(struct acpi_battery *battery)
570 {
571 acpi_status status = 0;
572
573 if (!acpi_battery_present(battery) ||
574 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
575 return -ENODEV;
576
577 mutex_lock(&battery->lock);
578 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
579 battery->alarm);
580 mutex_unlock(&battery->lock);
581
582 if (ACPI_FAILURE(status))
583 return -ENODEV;
584
585 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
586 return 0;
587 }
588
589 static int acpi_battery_init_alarm(struct acpi_battery *battery)
590 {
591 /* See if alarms are supported, and if so, set default */
592 if (!acpi_has_method(battery->device->handle, "_BTP")) {
593 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
594 return 0;
595 }
596 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
597 if (!battery->alarm)
598 battery->alarm = battery->design_capacity_warning;
599 return acpi_battery_set_alarm(battery);
600 }
601
602 static ssize_t acpi_battery_alarm_show(struct device *dev,
603 struct device_attribute *attr,
604 char *buf)
605 {
606 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
607 return sprintf(buf, "%d\n", battery->alarm * 1000);
608 }
609
610 static ssize_t acpi_battery_alarm_store(struct device *dev,
611 struct device_attribute *attr,
612 const char *buf, size_t count)
613 {
614 unsigned long x;
615 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
616 if (sscanf(buf, "%lu\n", &x) == 1)
617 battery->alarm = x/1000;
618 if (acpi_battery_present(battery))
619 acpi_battery_set_alarm(battery);
620 return count;
621 }
622
623 static const struct device_attribute alarm_attr = {
624 .attr = {.name = "alarm", .mode = 0644},
625 .show = acpi_battery_alarm_show,
626 .store = acpi_battery_alarm_store,
627 };
628
629 static int sysfs_add_battery(struct acpi_battery *battery)
630 {
631 struct power_supply_config psy_cfg = { .drv_data = battery, };
632
633 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
634 battery->bat_desc.properties = charge_battery_props;
635 battery->bat_desc.num_properties =
636 ARRAY_SIZE(charge_battery_props);
637 } else {
638 battery->bat_desc.properties = energy_battery_props;
639 battery->bat_desc.num_properties =
640 ARRAY_SIZE(energy_battery_props);
641 }
642
643 battery->bat_desc.name = acpi_device_bid(battery->device);
644 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
645 battery->bat_desc.get_property = acpi_battery_get_property;
646
647 battery->bat = power_supply_register_no_ws(&battery->device->dev,
648 &battery->bat_desc, &psy_cfg);
649
650 if (IS_ERR(battery->bat)) {
651 int result = PTR_ERR(battery->bat);
652
653 battery->bat = NULL;
654 return result;
655 }
656 return device_create_file(&battery->bat->dev, &alarm_attr);
657 }
658
659 static void sysfs_remove_battery(struct acpi_battery *battery)
660 {
661 mutex_lock(&battery->sysfs_lock);
662 if (!battery->bat) {
663 mutex_unlock(&battery->sysfs_lock);
664 return;
665 }
666
667 device_remove_file(&battery->bat->dev, &alarm_attr);
668 power_supply_unregister(battery->bat);
669 battery->bat = NULL;
670 mutex_unlock(&battery->sysfs_lock);
671 }
672
673 static void find_battery(const struct dmi_header *dm, void *private)
674 {
675 struct acpi_battery *battery = (struct acpi_battery *)private;
676 /* Note: the hardcoded offsets below have been extracted from
677 the source code of dmidecode. */
678 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
679 const u8 *dmi_data = (const u8 *)(dm + 1);
680 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
681 if (dm->length >= 18)
682 dmi_capacity *= dmi_data[17];
683 if (battery->design_capacity * battery->design_voltage / 1000
684 != dmi_capacity &&
685 battery->design_capacity * 10 == dmi_capacity)
686 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
687 &battery->flags);
688 }
689 }
690
691 /*
692 * According to the ACPI spec, some kinds of primary batteries can
693 * report percentage battery remaining capacity directly to OS.
694 * In this case, it reports the Last Full Charged Capacity == 100
695 * and BatteryPresentRate == 0xFFFFFFFF.
696 *
697 * Now we found some battery reports percentage remaining capacity
698 * even if it's rechargeable.
699 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
700 *
701 * Handle this correctly so that they won't break userspace.
702 */
703 static void acpi_battery_quirks(struct acpi_battery *battery)
704 {
705 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
706 return;
707
708 if (battery->full_charge_capacity == 100 &&
709 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
710 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
711 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
712 battery->full_charge_capacity = battery->design_capacity;
713 battery->capacity_now = (battery->capacity_now *
714 battery->full_charge_capacity) / 100;
715 }
716
717 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
718 return;
719
720 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
721 const char *s;
722 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
723 if (s && !strncasecmp(s, "ThinkPad", 8)) {
724 dmi_walk(find_battery, battery);
725 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
726 &battery->flags) &&
727 battery->design_voltage) {
728 battery->design_capacity =
729 battery->design_capacity *
730 10000 / battery->design_voltage;
731 battery->full_charge_capacity =
732 battery->full_charge_capacity *
733 10000 / battery->design_voltage;
734 battery->design_capacity_warning =
735 battery->design_capacity_warning *
736 10000 / battery->design_voltage;
737 battery->capacity_now = battery->capacity_now *
738 10000 / battery->design_voltage;
739 }
740 }
741 }
742 }
743
744 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
745 {
746 int result, old_present = acpi_battery_present(battery);
747 result = acpi_battery_get_status(battery);
748 if (result)
749 return result;
750 if (!acpi_battery_present(battery)) {
751 sysfs_remove_battery(battery);
752 battery->update_time = 0;
753 return 0;
754 }
755
756 if (resume)
757 return 0;
758
759 if (!battery->update_time ||
760 old_present != acpi_battery_present(battery)) {
761 result = acpi_battery_get_info(battery);
762 if (result)
763 return result;
764 acpi_battery_init_alarm(battery);
765 }
766
767 result = acpi_battery_get_state(battery);
768 if (result)
769 return result;
770 acpi_battery_quirks(battery);
771
772 if (!battery->bat) {
773 result = sysfs_add_battery(battery);
774 if (result)
775 return result;
776 }
777
778 /*
779 * Wakeup the system if battery is critical low
780 * or lower than the alarm level
781 */
782 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
783 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
784 (battery->capacity_now <= battery->alarm)))
785 acpi_pm_wakeup_event(&battery->device->dev);
786
787 return result;
788 }
789
790 static void acpi_battery_refresh(struct acpi_battery *battery)
791 {
792 int power_unit;
793
794 if (!battery->bat)
795 return;
796
797 power_unit = battery->power_unit;
798
799 acpi_battery_get_info(battery);
800
801 if (power_unit == battery->power_unit)
802 return;
803
804 /* The battery has changed its reporting units. */
805 sysfs_remove_battery(battery);
806 sysfs_add_battery(battery);
807 }
808
809 /* --------------------------------------------------------------------------
810 FS Interface (/proc)
811 -------------------------------------------------------------------------- */
812
813 #ifdef CONFIG_ACPI_PROCFS_POWER
814 static struct proc_dir_entry *acpi_battery_dir;
815
816 static const char *acpi_battery_units(const struct acpi_battery *battery)
817 {
818 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
819 "mA" : "mW";
820 }
821
822 static int acpi_battery_print_info(struct seq_file *seq, int result)
823 {
824 struct acpi_battery *battery = seq->private;
825
826 if (result)
827 goto end;
828
829 seq_printf(seq, "present: %s\n",
830 acpi_battery_present(battery) ? "yes" : "no");
831 if (!acpi_battery_present(battery))
832 goto end;
833 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
834 seq_printf(seq, "design capacity: unknown\n");
835 else
836 seq_printf(seq, "design capacity: %d %sh\n",
837 battery->design_capacity,
838 acpi_battery_units(battery));
839
840 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
841 seq_printf(seq, "last full capacity: unknown\n");
842 else
843 seq_printf(seq, "last full capacity: %d %sh\n",
844 battery->full_charge_capacity,
845 acpi_battery_units(battery));
846
847 seq_printf(seq, "battery technology: %srechargeable\n",
848 (!battery->technology)?"non-":"");
849
850 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
851 seq_printf(seq, "design voltage: unknown\n");
852 else
853 seq_printf(seq, "design voltage: %d mV\n",
854 battery->design_voltage);
855 seq_printf(seq, "design capacity warning: %d %sh\n",
856 battery->design_capacity_warning,
857 acpi_battery_units(battery));
858 seq_printf(seq, "design capacity low: %d %sh\n",
859 battery->design_capacity_low,
860 acpi_battery_units(battery));
861 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
862 seq_printf(seq, "capacity granularity 1: %d %sh\n",
863 battery->capacity_granularity_1,
864 acpi_battery_units(battery));
865 seq_printf(seq, "capacity granularity 2: %d %sh\n",
866 battery->capacity_granularity_2,
867 acpi_battery_units(battery));
868 seq_printf(seq, "model number: %s\n", battery->model_number);
869 seq_printf(seq, "serial number: %s\n", battery->serial_number);
870 seq_printf(seq, "battery type: %s\n", battery->type);
871 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
872 end:
873 if (result)
874 seq_printf(seq, "ERROR: Unable to read battery info\n");
875 return result;
876 }
877
878 static int acpi_battery_print_state(struct seq_file *seq, int result)
879 {
880 struct acpi_battery *battery = seq->private;
881
882 if (result)
883 goto end;
884
885 seq_printf(seq, "present: %s\n",
886 acpi_battery_present(battery) ? "yes" : "no");
887 if (!acpi_battery_present(battery))
888 goto end;
889
890 seq_printf(seq, "capacity state: %s\n",
891 (battery->state & 0x04) ? "critical" : "ok");
892 if ((battery->state & 0x01) && (battery->state & 0x02))
893 seq_printf(seq,
894 "charging state: charging/discharging\n");
895 else if (battery->state & 0x01)
896 seq_printf(seq, "charging state: discharging\n");
897 else if (battery->state & 0x02)
898 seq_printf(seq, "charging state: charging\n");
899 else
900 seq_printf(seq, "charging state: charged\n");
901
902 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
903 seq_printf(seq, "present rate: unknown\n");
904 else
905 seq_printf(seq, "present rate: %d %s\n",
906 battery->rate_now, acpi_battery_units(battery));
907
908 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
909 seq_printf(seq, "remaining capacity: unknown\n");
910 else
911 seq_printf(seq, "remaining capacity: %d %sh\n",
912 battery->capacity_now, acpi_battery_units(battery));
913 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
914 seq_printf(seq, "present voltage: unknown\n");
915 else
916 seq_printf(seq, "present voltage: %d mV\n",
917 battery->voltage_now);
918 end:
919 if (result)
920 seq_printf(seq, "ERROR: Unable to read battery state\n");
921
922 return result;
923 }
924
925 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
926 {
927 struct acpi_battery *battery = seq->private;
928
929 if (result)
930 goto end;
931
932 if (!acpi_battery_present(battery)) {
933 seq_printf(seq, "present: no\n");
934 goto end;
935 }
936 seq_printf(seq, "alarm: ");
937 if (!battery->alarm)
938 seq_printf(seq, "unsupported\n");
939 else
940 seq_printf(seq, "%u %sh\n", battery->alarm,
941 acpi_battery_units(battery));
942 end:
943 if (result)
944 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
945 return result;
946 }
947
948 static ssize_t acpi_battery_write_alarm(struct file *file,
949 const char __user * buffer,
950 size_t count, loff_t * ppos)
951 {
952 int result = 0;
953 char alarm_string[12] = { '\0' };
954 struct seq_file *m = file->private_data;
955 struct acpi_battery *battery = m->private;
956
957 if (!battery || (count > sizeof(alarm_string) - 1))
958 return -EINVAL;
959 if (!acpi_battery_present(battery)) {
960 result = -ENODEV;
961 goto end;
962 }
963 if (copy_from_user(alarm_string, buffer, count)) {
964 result = -EFAULT;
965 goto end;
966 }
967 alarm_string[count] = '\0';
968 if (kstrtoint(alarm_string, 0, &battery->alarm)) {
969 result = -EINVAL;
970 goto end;
971 }
972 result = acpi_battery_set_alarm(battery);
973 end:
974 if (!result)
975 return count;
976 return result;
977 }
978
979 typedef int(*print_func)(struct seq_file *seq, int result);
980
981 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
982 acpi_battery_print_info,
983 acpi_battery_print_state,
984 acpi_battery_print_alarm,
985 };
986
987 static int acpi_battery_read(int fid, struct seq_file *seq)
988 {
989 struct acpi_battery *battery = seq->private;
990 int result = acpi_battery_update(battery, false);
991 return acpi_print_funcs[fid](seq, result);
992 }
993
994 #define DECLARE_FILE_FUNCTIONS(_name) \
995 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
996 { \
997 return acpi_battery_read(_name##_tag, seq); \
998 } \
999 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
1000 { \
1001 return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
1002 }
1003
1004 DECLARE_FILE_FUNCTIONS(info);
1005 DECLARE_FILE_FUNCTIONS(state);
1006 DECLARE_FILE_FUNCTIONS(alarm);
1007
1008 #undef DECLARE_FILE_FUNCTIONS
1009
1010 #define FILE_DESCRIPTION_RO(_name) \
1011 { \
1012 .name = __stringify(_name), \
1013 .mode = S_IRUGO, \
1014 .ops = { \
1015 .open = acpi_battery_##_name##_open_fs, \
1016 .read = seq_read, \
1017 .llseek = seq_lseek, \
1018 .release = single_release, \
1019 .owner = THIS_MODULE, \
1020 }, \
1021 }
1022
1023 #define FILE_DESCRIPTION_RW(_name) \
1024 { \
1025 .name = __stringify(_name), \
1026 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
1027 .ops = { \
1028 .open = acpi_battery_##_name##_open_fs, \
1029 .read = seq_read, \
1030 .llseek = seq_lseek, \
1031 .write = acpi_battery_write_##_name, \
1032 .release = single_release, \
1033 .owner = THIS_MODULE, \
1034 }, \
1035 }
1036
1037 static const struct battery_file {
1038 struct file_operations ops;
1039 umode_t mode;
1040 const char *name;
1041 } acpi_battery_file[] = {
1042 FILE_DESCRIPTION_RO(info),
1043 FILE_DESCRIPTION_RO(state),
1044 FILE_DESCRIPTION_RW(alarm),
1045 };
1046
1047 #undef FILE_DESCRIPTION_RO
1048 #undef FILE_DESCRIPTION_RW
1049
1050 static int acpi_battery_add_fs(struct acpi_device *device)
1051 {
1052 struct proc_dir_entry *entry = NULL;
1053 int i;
1054
1055 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
1056 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
1057 if (!acpi_device_dir(device)) {
1058 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1059 acpi_battery_dir);
1060 if (!acpi_device_dir(device))
1061 return -ENODEV;
1062 }
1063
1064 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
1065 entry = proc_create_data(acpi_battery_file[i].name,
1066 acpi_battery_file[i].mode,
1067 acpi_device_dir(device),
1068 &acpi_battery_file[i].ops,
1069 acpi_driver_data(device));
1070 if (!entry)
1071 return -ENODEV;
1072 }
1073 return 0;
1074 }
1075
1076 static void acpi_battery_remove_fs(struct acpi_device *device)
1077 {
1078 int i;
1079 if (!acpi_device_dir(device))
1080 return;
1081 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
1082 remove_proc_entry(acpi_battery_file[i].name,
1083 acpi_device_dir(device));
1084
1085 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
1086 acpi_device_dir(device) = NULL;
1087 }
1088
1089 #endif
1090
1091 /* --------------------------------------------------------------------------
1092 Driver Interface
1093 -------------------------------------------------------------------------- */
1094
1095 static void acpi_battery_notify(struct acpi_device *device, u32 event)
1096 {
1097 struct acpi_battery *battery = acpi_driver_data(device);
1098 struct power_supply *old;
1099
1100 if (!battery)
1101 return;
1102 old = battery->bat;
1103 /*
1104 * On Acer Aspire V5-573G notifications are sometimes triggered too
1105 * early. For example, when AC is unplugged and notification is
1106 * triggered, battery state is still reported as "Full", and changes to
1107 * "Discharging" only after short delay, without any notification.
1108 */
1109 if (battery_notification_delay_ms > 0)
1110 msleep(battery_notification_delay_ms);
1111 if (event == ACPI_BATTERY_NOTIFY_INFO)
1112 acpi_battery_refresh(battery);
1113 acpi_battery_update(battery, false);
1114 acpi_bus_generate_netlink_event(device->pnp.device_class,
1115 dev_name(&device->dev), event,
1116 acpi_battery_present(battery));
1117 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1118 /* acpi_battery_update could remove power_supply object */
1119 if (old && battery->bat)
1120 power_supply_changed(battery->bat);
1121 }
1122
1123 static int battery_notify(struct notifier_block *nb,
1124 unsigned long mode, void *_unused)
1125 {
1126 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1127 pm_nb);
1128 int result;
1129
1130 switch (mode) {
1131 case PM_POST_HIBERNATION:
1132 case PM_POST_SUSPEND:
1133 if (!acpi_battery_present(battery))
1134 return 0;
1135
1136 if (!battery->bat) {
1137 result = acpi_battery_get_info(battery);
1138 if (result)
1139 return result;
1140
1141 result = sysfs_add_battery(battery);
1142 if (result)
1143 return result;
1144 } else
1145 acpi_battery_refresh(battery);
1146
1147 acpi_battery_init_alarm(battery);
1148 acpi_battery_get_state(battery);
1149 break;
1150 }
1151
1152 return 0;
1153 }
1154
1155 static int __init
1156 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1157 {
1158 battery_bix_broken_package = 1;
1159 return 0;
1160 }
1161
1162 static int __init
1163 battery_notification_delay_quirk(const struct dmi_system_id *d)
1164 {
1165 battery_notification_delay_ms = 1000;
1166 return 0;
1167 }
1168
1169 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1170 {
1171 .callback = battery_bix_broken_package_quirk,
1172 .ident = "NEC LZ750/LS",
1173 .matches = {
1174 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1175 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1176 },
1177 },
1178 {
1179 .callback = battery_notification_delay_quirk,
1180 .ident = "Acer Aspire V5-573G",
1181 .matches = {
1182 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1183 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1184 },
1185 },
1186 {},
1187 };
1188
1189 /*
1190 * Some machines'(E,G Lenovo Z480) ECs are not stable
1191 * during boot up and this causes battery driver fails to be
1192 * probed due to failure of getting battery information
1193 * from EC sometimes. After several retries, the operation
1194 * may work. So add retry code here and 20ms sleep between
1195 * every retries.
1196 */
1197 static int acpi_battery_update_retry(struct acpi_battery *battery)
1198 {
1199 int retry, ret;
1200
1201 for (retry = 5; retry; retry--) {
1202 ret = acpi_battery_update(battery, false);
1203 if (!ret)
1204 break;
1205
1206 msleep(20);
1207 }
1208 return ret;
1209 }
1210
1211 static int acpi_battery_add(struct acpi_device *device)
1212 {
1213 int result = 0;
1214 struct acpi_battery *battery = NULL;
1215
1216 if (!device)
1217 return -EINVAL;
1218
1219 if (device->dep_unmet)
1220 return -EPROBE_DEFER;
1221
1222 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1223 if (!battery)
1224 return -ENOMEM;
1225 battery->device = device;
1226 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1227 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1228 device->driver_data = battery;
1229 mutex_init(&battery->lock);
1230 mutex_init(&battery->sysfs_lock);
1231 if (acpi_has_method(battery->device->handle, "_BIX"))
1232 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1233
1234 result = acpi_battery_update_retry(battery);
1235 if (result)
1236 goto fail;
1237
1238 #ifdef CONFIG_ACPI_PROCFS_POWER
1239 result = acpi_battery_add_fs(device);
1240 if (result) {
1241 acpi_battery_remove_fs(device);
1242 goto fail;
1243 }
1244 #endif
1245
1246 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1247 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1248 device->status.battery_present ? "present" : "absent");
1249
1250 battery->pm_nb.notifier_call = battery_notify;
1251 register_pm_notifier(&battery->pm_nb);
1252
1253 device_init_wakeup(&device->dev, 1);
1254
1255 return result;
1256
1257 fail:
1258 sysfs_remove_battery(battery);
1259 mutex_destroy(&battery->lock);
1260 mutex_destroy(&battery->sysfs_lock);
1261 kfree(battery);
1262 return result;
1263 }
1264
1265 static int acpi_battery_remove(struct acpi_device *device)
1266 {
1267 struct acpi_battery *battery = NULL;
1268
1269 if (!device || !acpi_driver_data(device))
1270 return -EINVAL;
1271 device_init_wakeup(&device->dev, 0);
1272 battery = acpi_driver_data(device);
1273 unregister_pm_notifier(&battery->pm_nb);
1274 #ifdef CONFIG_ACPI_PROCFS_POWER
1275 acpi_battery_remove_fs(device);
1276 #endif
1277 sysfs_remove_battery(battery);
1278 mutex_destroy(&battery->lock);
1279 mutex_destroy(&battery->sysfs_lock);
1280 kfree(battery);
1281 return 0;
1282 }
1283
1284 #ifdef CONFIG_PM_SLEEP
1285 /* this is needed to learn about changes made in suspended state */
1286 static int acpi_battery_resume(struct device *dev)
1287 {
1288 struct acpi_battery *battery;
1289
1290 if (!dev)
1291 return -EINVAL;
1292
1293 battery = acpi_driver_data(to_acpi_device(dev));
1294 if (!battery)
1295 return -EINVAL;
1296
1297 battery->update_time = 0;
1298 acpi_battery_update(battery, true);
1299 return 0;
1300 }
1301 #else
1302 #define acpi_battery_resume NULL
1303 #endif
1304
1305 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1306
1307 static struct acpi_driver acpi_battery_driver = {
1308 .name = "battery",
1309 .class = ACPI_BATTERY_CLASS,
1310 .ids = battery_device_ids,
1311 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1312 .ops = {
1313 .add = acpi_battery_add,
1314 .remove = acpi_battery_remove,
1315 .notify = acpi_battery_notify,
1316 },
1317 .drv.pm = &acpi_battery_pm,
1318 };
1319
1320 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1321 {
1322 unsigned int i;
1323 int result;
1324
1325 for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
1326 if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
1327 pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME
1328 ": found native %s PMIC, not loading\n",
1329 acpi_battery_blacklist[i]);
1330 return;
1331 }
1332
1333 dmi_check_system(bat_dmi_table);
1334
1335 #ifdef CONFIG_ACPI_PROCFS_POWER
1336 acpi_battery_dir = acpi_lock_battery_dir();
1337 if (!acpi_battery_dir)
1338 return;
1339 #endif
1340 result = acpi_bus_register_driver(&acpi_battery_driver);
1341 #ifdef CONFIG_ACPI_PROCFS_POWER
1342 if (result < 0)
1343 acpi_unlock_battery_dir(acpi_battery_dir);
1344 #endif
1345 battery_driver_registered = (result == 0);
1346 }
1347
1348 static int __init acpi_battery_init(void)
1349 {
1350 if (acpi_disabled)
1351 return -ENODEV;
1352
1353 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1354 return 0;
1355 }
1356
1357 static void __exit acpi_battery_exit(void)
1358 {
1359 async_synchronize_cookie(async_cookie + 1);
1360 if (battery_driver_registered)
1361 acpi_bus_unregister_driver(&acpi_battery_driver);
1362 #ifdef CONFIG_ACPI_PROCFS_POWER
1363 if (acpi_battery_dir)
1364 acpi_unlock_battery_dir(acpi_battery_dir);
1365 #endif
1366 }
1367
1368 module_init(acpi_battery_init);
1369 module_exit(acpi_battery_exit);
Linux with added FPC-III support