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mt76x2: apply coverage class on slot time too
[linux/fpc-iii.git] / drivers / acpi / battery.c
blobbdb24d636d9acc9c1a0dedbb2f30c6e2ed381593
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26 #include <linux/kernel.h>
27 #include <linux/list.h>
28 #include <linux/module.h>
29 #include <linux/mutex.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/delay.h>
36 #include <linux/slab.h>
37 #include <linux/suspend.h>
38 #include <asm/unaligned.h>
39
40 #ifdef CONFIG_ACPI_PROCFS_POWER
41 #include <linux/proc_fs.h>
42 #include <linux/seq_file.h>
43 #include <linux/uaccess.h>
44 #endif
45
46 #include <linux/acpi.h>
47 #include <linux/power_supply.h>
48
49 #include <acpi/battery.h>
50
51 #define PREFIX "ACPI: "
52
53 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
54
55 #define ACPI_BATTERY_DEVICE_NAME "Battery"
56
57 /* Battery power unit: 0 means mW, 1 means mA */
58 #define ACPI_BATTERY_POWER_UNIT_MA 1
59
60 #define ACPI_BATTERY_STATE_DISCHARGING 0x1
61 #define ACPI_BATTERY_STATE_CHARGING 0x2
62 #define ACPI_BATTERY_STATE_CRITICAL 0x4
63
64 #define _COMPONENT ACPI_BATTERY_COMPONENT
65
66 ACPI_MODULE_NAME("battery");
67
68 MODULE_AUTHOR("Paul Diefenbaugh");
69 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
70 MODULE_DESCRIPTION("ACPI Battery Driver");
71 MODULE_LICENSE("GPL");
72
73 static async_cookie_t async_cookie;
74 static bool battery_driver_registered;
75 static int battery_bix_broken_package;
76 static int battery_notification_delay_ms;
77 static unsigned int cache_time = 1000;
78 module_param(cache_time, uint, 0644);
79 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
80
81 #ifdef CONFIG_ACPI_PROCFS_POWER
82 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
83 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
84
85 enum acpi_battery_files {
86 info_tag = 0,
87 state_tag,
88 alarm_tag,
89 ACPI_BATTERY_NUMFILES,
90 };
91
92 #endif
93
94 static const struct acpi_device_id battery_device_ids[] = {
95 {"PNP0C0A", 0},
96 {"", 0},
97 };
98
99 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
100
101 /* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
102 static const char * const acpi_battery_blacklist[] = {
103 "INT33F4", /* X-Powers AXP288 PMIC */
104 };
105
106 enum {
107 ACPI_BATTERY_ALARM_PRESENT,
108 ACPI_BATTERY_XINFO_PRESENT,
109 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
110 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
111 switches between mWh and mAh depending on whether the system
112 is running on battery or not. When mAh is the unit, most
113 reported values are incorrect and need to be adjusted by
114 10000/design_voltage. Verified on x201, t410, t410s, and x220.
115 Pre-2010 and 2012 models appear to always report in mWh and
116 are thus unaffected (tested with t42, t61, t500, x200, x300,
117 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
118 the 2011 models that fixes the issue (tested on x220 with a
119 post-1.29 BIOS), but as of Nov. 2012, no such update is
120 available for the 2010 models. */
121 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
122 /* for batteries reporting current capacity with design capacity
123 * on a full charge, but showing degradation in full charge cap.
124 */
125 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
126 };
127
128 struct acpi_battery {
129 struct mutex lock;
130 struct mutex sysfs_lock;
131 struct power_supply *bat;
132 struct power_supply_desc bat_desc;
133 struct acpi_device *device;
134 struct notifier_block pm_nb;
135 struct list_head list;
136 unsigned long update_time;
137 int revision;
138 int rate_now;
139 int capacity_now;
140 int voltage_now;
141 int design_capacity;
142 int full_charge_capacity;
143 int technology;
144 int design_voltage;
145 int design_capacity_warning;
146 int design_capacity_low;
147 int cycle_count;
148 int measurement_accuracy;
149 int max_sampling_time;
150 int min_sampling_time;
151 int max_averaging_interval;
152 int min_averaging_interval;
153 int capacity_granularity_1;
154 int capacity_granularity_2;
155 int alarm;
156 char model_number[32];
157 char serial_number[32];
158 char type[32];
159 char oem_info[32];
160 int state;
161 int power_unit;
162 unsigned long flags;
163 };
164
165 #define to_acpi_battery(x) power_supply_get_drvdata(x)
166
167 static inline int acpi_battery_present(struct acpi_battery *battery)
168 {
169 return battery->device->status.battery_present;
170 }
171
172 static int acpi_battery_technology(struct acpi_battery *battery)
173 {
174 if (!strcasecmp("NiCd", battery->type))
175 return POWER_SUPPLY_TECHNOLOGY_NiCd;
176 if (!strcasecmp("NiMH", battery->type))
177 return POWER_SUPPLY_TECHNOLOGY_NiMH;
178 if (!strcasecmp("LION", battery->type))
179 return POWER_SUPPLY_TECHNOLOGY_LION;
180 if (!strncasecmp("LI-ION", battery->type, 6))
181 return POWER_SUPPLY_TECHNOLOGY_LION;
182 if (!strcasecmp("LiP", battery->type))
183 return POWER_SUPPLY_TECHNOLOGY_LIPO;
184 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
185 }
186
187 static int acpi_battery_get_state(struct acpi_battery *battery);
188
189 static int acpi_battery_is_charged(struct acpi_battery *battery)
190 {
191 /* charging, discharging or critical low */
192 if (battery->state != 0)
193 return 0;
194
195 /* battery not reporting charge */
196 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
197 battery->capacity_now == 0)
198 return 0;
199
200 /* good batteries update full_charge as the batteries degrade */
201 if (battery->full_charge_capacity == battery->capacity_now)
202 return 1;
203
204 /* fallback to using design values for broken batteries */
205 if (battery->design_capacity == battery->capacity_now)
206 return 1;
207
208 /* we don't do any sort of metric based on percentages */
209 return 0;
210 }
211
212 static bool acpi_battery_is_degraded(struct acpi_battery *battery)
213 {
214 return battery->full_charge_capacity && battery->design_capacity &&
215 battery->full_charge_capacity < battery->design_capacity;
216 }
217
218 static int acpi_battery_get_property(struct power_supply *psy,
219 enum power_supply_property psp,
220 union power_supply_propval *val)
221 {
222 int ret = 0;
223 struct acpi_battery *battery = to_acpi_battery(psy);
224
225 if (acpi_battery_present(battery)) {
226 /* run battery update only if it is present */
227 acpi_battery_get_state(battery);
228 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
229 return -ENODEV;
230 switch (psp) {
231 case POWER_SUPPLY_PROP_STATUS:
232 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
233 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
234 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
235 val->intval = POWER_SUPPLY_STATUS_CHARGING;
236 else if (acpi_battery_is_charged(battery))
237 val->intval = POWER_SUPPLY_STATUS_FULL;
238 else
239 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
240 break;
241 case POWER_SUPPLY_PROP_PRESENT:
242 val->intval = acpi_battery_present(battery);
243 break;
244 case POWER_SUPPLY_PROP_TECHNOLOGY:
245 val->intval = acpi_battery_technology(battery);
246 break;
247 case POWER_SUPPLY_PROP_CYCLE_COUNT:
248 val->intval = battery->cycle_count;
249 break;
250 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
251 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
252 ret = -ENODEV;
253 else
254 val->intval = battery->design_voltage * 1000;
255 break;
256 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
257 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
258 ret = -ENODEV;
259 else
260 val->intval = battery->voltage_now * 1000;
261 break;
262 case POWER_SUPPLY_PROP_CURRENT_NOW:
263 case POWER_SUPPLY_PROP_POWER_NOW:
264 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
265 ret = -ENODEV;
266 else
267 val->intval = battery->rate_now * 1000;
268 break;
269 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
270 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
271 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
272 ret = -ENODEV;
273 else
274 val->intval = battery->design_capacity * 1000;
275 break;
276 case POWER_SUPPLY_PROP_CHARGE_FULL:
277 case POWER_SUPPLY_PROP_ENERGY_FULL:
278 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
279 ret = -ENODEV;
280 else
281 val->intval = battery->full_charge_capacity * 1000;
282 break;
283 case POWER_SUPPLY_PROP_CHARGE_NOW:
284 case POWER_SUPPLY_PROP_ENERGY_NOW:
285 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
286 ret = -ENODEV;
287 else
288 val->intval = battery->capacity_now * 1000;
289 break;
290 case POWER_SUPPLY_PROP_CAPACITY:
291 if (battery->capacity_now && battery->full_charge_capacity)
292 val->intval = battery->capacity_now * 100/
293 battery->full_charge_capacity;
294 else
295 val->intval = 0;
296 break;
297 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
298 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
299 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
300 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
301 (battery->capacity_now <= battery->alarm))
302 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
303 else if (acpi_battery_is_charged(battery))
304 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
305 else
306 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
307 break;
308 case POWER_SUPPLY_PROP_MODEL_NAME:
309 val->strval = battery->model_number;
310 break;
311 case POWER_SUPPLY_PROP_MANUFACTURER:
312 val->strval = battery->oem_info;
313 break;
314 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
315 val->strval = battery->serial_number;
316 break;
317 default:
318 ret = -EINVAL;
319 }
320 return ret;
321 }
322
323 static enum power_supply_property charge_battery_props[] = {
324 POWER_SUPPLY_PROP_STATUS,
325 POWER_SUPPLY_PROP_PRESENT,
326 POWER_SUPPLY_PROP_TECHNOLOGY,
327 POWER_SUPPLY_PROP_CYCLE_COUNT,
328 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
329 POWER_SUPPLY_PROP_VOLTAGE_NOW,
330 POWER_SUPPLY_PROP_CURRENT_NOW,
331 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
332 POWER_SUPPLY_PROP_CHARGE_FULL,
333 POWER_SUPPLY_PROP_CHARGE_NOW,
334 POWER_SUPPLY_PROP_CAPACITY,
335 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
336 POWER_SUPPLY_PROP_MODEL_NAME,
337 POWER_SUPPLY_PROP_MANUFACTURER,
338 POWER_SUPPLY_PROP_SERIAL_NUMBER,
339 };
340
341 static enum power_supply_property energy_battery_props[] = {
342 POWER_SUPPLY_PROP_STATUS,
343 POWER_SUPPLY_PROP_PRESENT,
344 POWER_SUPPLY_PROP_TECHNOLOGY,
345 POWER_SUPPLY_PROP_CYCLE_COUNT,
346 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
347 POWER_SUPPLY_PROP_VOLTAGE_NOW,
348 POWER_SUPPLY_PROP_POWER_NOW,
349 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
350 POWER_SUPPLY_PROP_ENERGY_FULL,
351 POWER_SUPPLY_PROP_ENERGY_NOW,
352 POWER_SUPPLY_PROP_CAPACITY,
353 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
354 POWER_SUPPLY_PROP_MODEL_NAME,
355 POWER_SUPPLY_PROP_MANUFACTURER,
356 POWER_SUPPLY_PROP_SERIAL_NUMBER,
357 };
358
359 /* --------------------------------------------------------------------------
360 Battery Management
361 -------------------------------------------------------------------------- */
362 struct acpi_offsets {
363 size_t offset; /* offset inside struct acpi_sbs_battery */
364 u8 mode; /* int or string? */
365 };
366
367 static const struct acpi_offsets state_offsets[] = {
368 {offsetof(struct acpi_battery, state), 0},
369 {offsetof(struct acpi_battery, rate_now), 0},
370 {offsetof(struct acpi_battery, capacity_now), 0},
371 {offsetof(struct acpi_battery, voltage_now), 0},
372 };
373
374 static const struct acpi_offsets info_offsets[] = {
375 {offsetof(struct acpi_battery, power_unit), 0},
376 {offsetof(struct acpi_battery, design_capacity), 0},
377 {offsetof(struct acpi_battery, full_charge_capacity), 0},
378 {offsetof(struct acpi_battery, technology), 0},
379 {offsetof(struct acpi_battery, design_voltage), 0},
380 {offsetof(struct acpi_battery, design_capacity_warning), 0},
381 {offsetof(struct acpi_battery, design_capacity_low), 0},
382 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
383 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
384 {offsetof(struct acpi_battery, model_number), 1},
385 {offsetof(struct acpi_battery, serial_number), 1},
386 {offsetof(struct acpi_battery, type), 1},
387 {offsetof(struct acpi_battery, oem_info), 1},
388 };
389
390 static const struct acpi_offsets extended_info_offsets[] = {
391 {offsetof(struct acpi_battery, revision), 0},
392 {offsetof(struct acpi_battery, power_unit), 0},
393 {offsetof(struct acpi_battery, design_capacity), 0},
394 {offsetof(struct acpi_battery, full_charge_capacity), 0},
395 {offsetof(struct acpi_battery, technology), 0},
396 {offsetof(struct acpi_battery, design_voltage), 0},
397 {offsetof(struct acpi_battery, design_capacity_warning), 0},
398 {offsetof(struct acpi_battery, design_capacity_low), 0},
399 {offsetof(struct acpi_battery, cycle_count), 0},
400 {offsetof(struct acpi_battery, measurement_accuracy), 0},
401 {offsetof(struct acpi_battery, max_sampling_time), 0},
402 {offsetof(struct acpi_battery, min_sampling_time), 0},
403 {offsetof(struct acpi_battery, max_averaging_interval), 0},
404 {offsetof(struct acpi_battery, min_averaging_interval), 0},
405 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
406 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
407 {offsetof(struct acpi_battery, model_number), 1},
408 {offsetof(struct acpi_battery, serial_number), 1},
409 {offsetof(struct acpi_battery, type), 1},
410 {offsetof(struct acpi_battery, oem_info), 1},
411 };
412
413 static int extract_package(struct acpi_battery *battery,
414 union acpi_object *package,
415 const struct acpi_offsets *offsets, int num)
416 {
417 int i;
418 union acpi_object *element;
419 if (package->type != ACPI_TYPE_PACKAGE)
420 return -EFAULT;
421 for (i = 0; i < num; ++i) {
422 if (package->package.count <= i)
423 return -EFAULT;
424 element = &package->package.elements[i];
425 if (offsets[i].mode) {
426 u8 *ptr = (u8 *)battery + offsets[i].offset;
427 if (element->type == ACPI_TYPE_STRING ||
428 element->type == ACPI_TYPE_BUFFER)
429 strncpy(ptr, element->string.pointer, 32);
430 else if (element->type == ACPI_TYPE_INTEGER) {
431 strncpy(ptr, (u8 *)&element->integer.value,
432 sizeof(u64));
433 ptr[sizeof(u64)] = 0;
434 } else
435 *ptr = 0; /* don't have value */
436 } else {
437 int *x = (int *)((u8 *)battery + offsets[i].offset);
438 *x = (element->type == ACPI_TYPE_INTEGER) ?
439 element->integer.value : -1;
440 }
441 }
442 return 0;
443 }
444
445 static int acpi_battery_get_status(struct acpi_battery *battery)
446 {
447 if (acpi_bus_get_status(battery->device)) {
448 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
449 return -ENODEV;
450 }
451 return 0;
452 }
453
454
455 static int extract_battery_info(const int use_bix,
456 struct acpi_battery *battery,
457 const struct acpi_buffer *buffer)
458 {
459 int result = -EFAULT;
460
461 if (use_bix && battery_bix_broken_package)
462 result = extract_package(battery, buffer->pointer,
463 extended_info_offsets + 1,
464 ARRAY_SIZE(extended_info_offsets) - 1);
465 else if (use_bix)
466 result = extract_package(battery, buffer->pointer,
467 extended_info_offsets,
468 ARRAY_SIZE(extended_info_offsets));
469 else
470 result = extract_package(battery, buffer->pointer,
471 info_offsets, ARRAY_SIZE(info_offsets));
472 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
473 battery->full_charge_capacity = battery->design_capacity;
474 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
475 battery->power_unit && battery->design_voltage) {
476 battery->design_capacity = battery->design_capacity *
477 10000 / battery->design_voltage;
478 battery->full_charge_capacity = battery->full_charge_capacity *
479 10000 / battery->design_voltage;
480 battery->design_capacity_warning =
481 battery->design_capacity_warning *
482 10000 / battery->design_voltage;
483 /* Curiously, design_capacity_low, unlike the rest of them,
484 is correct. */
485 /* capacity_granularity_* equal 1 on the systems tested, so
486 it's impossible to tell if they would need an adjustment
487 or not if their values were higher. */
488 }
489 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
490 battery->capacity_now > battery->full_charge_capacity)
491 battery->capacity_now = battery->full_charge_capacity;
492
493 return result;
494 }
495
496 static int acpi_battery_get_info(struct acpi_battery *battery)
497 {
498 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
499 int use_bix;
500 int result = -ENODEV;
501
502 if (!acpi_battery_present(battery))
503 return 0;
504
505
506 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
507 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
508 acpi_status status = AE_ERROR;
509
510 mutex_lock(&battery->lock);
511 status = acpi_evaluate_object(battery->device->handle,
512 use_bix ? "_BIX":"_BIF",
513 NULL, &buffer);
514 mutex_unlock(&battery->lock);
515
516 if (ACPI_FAILURE(status)) {
517 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s",
518 use_bix ? "_BIX":"_BIF"));
519 } else {
520 result = extract_battery_info(use_bix,
521 battery,
522 &buffer);
523
524 kfree(buffer.pointer);
525 break;
526 }
527 }
528
529 if (!result && !use_bix && xinfo)
530 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
531
532 return result;
533 }
534
535 static int acpi_battery_get_state(struct acpi_battery *battery)
536 {
537 int result = 0;
538 acpi_status status = 0;
539 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
540
541 if (!acpi_battery_present(battery))
542 return 0;
543
544 if (battery->update_time &&
545 time_before(jiffies, battery->update_time +
546 msecs_to_jiffies(cache_time)))
547 return 0;
548
549 mutex_lock(&battery->lock);
550 status = acpi_evaluate_object(battery->device->handle, "_BST",
551 NULL, &buffer);
552 mutex_unlock(&battery->lock);
553
554 if (ACPI_FAILURE(status)) {
555 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
556 return -ENODEV;
557 }
558
559 result = extract_package(battery, buffer.pointer,
560 state_offsets, ARRAY_SIZE(state_offsets));
561 battery->update_time = jiffies;
562 kfree(buffer.pointer);
563
564 /* For buggy DSDTs that report negative 16-bit values for either
565 * charging or discharging current and/or report 0 as 65536
566 * due to bad math.
567 */
568 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
569 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
570 (s16)(battery->rate_now) < 0) {
571 battery->rate_now = abs((s16)battery->rate_now);
572 printk_once(KERN_WARNING FW_BUG
573 "battery: (dis)charge rate invalid.\n");
574 }
575
576 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
577 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
578 battery->capacity_now = (battery->capacity_now *
579 battery->full_charge_capacity) / 100;
580 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
581 battery->power_unit && battery->design_voltage) {
582 battery->capacity_now = battery->capacity_now *
583 10000 / battery->design_voltage;
584 }
585 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
586 battery->capacity_now > battery->full_charge_capacity)
587 battery->capacity_now = battery->full_charge_capacity;
588
589 return result;
590 }
591
592 static int acpi_battery_set_alarm(struct acpi_battery *battery)
593 {
594 acpi_status status = 0;
595
596 if (!acpi_battery_present(battery) ||
597 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
598 return -ENODEV;
599
600 mutex_lock(&battery->lock);
601 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
602 battery->alarm);
603 mutex_unlock(&battery->lock);
604
605 if (ACPI_FAILURE(status))
606 return -ENODEV;
607
608 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
609 return 0;
610 }
611
612 static int acpi_battery_init_alarm(struct acpi_battery *battery)
613 {
614 /* See if alarms are supported, and if so, set default */
615 if (!acpi_has_method(battery->device->handle, "_BTP")) {
616 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
617 return 0;
618 }
619 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
620 if (!battery->alarm)
621 battery->alarm = battery->design_capacity_warning;
622 return acpi_battery_set_alarm(battery);
623 }
624
625 static ssize_t acpi_battery_alarm_show(struct device *dev,
626 struct device_attribute *attr,
627 char *buf)
628 {
629 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
630 return sprintf(buf, "%d\n", battery->alarm * 1000);
631 }
632
633 static ssize_t acpi_battery_alarm_store(struct device *dev,
634 struct device_attribute *attr,
635 const char *buf, size_t count)
636 {
637 unsigned long x;
638 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
639 if (sscanf(buf, "%lu\n", &x) == 1)
640 battery->alarm = x/1000;
641 if (acpi_battery_present(battery))
642 acpi_battery_set_alarm(battery);
643 return count;
644 }
645
646 static const struct device_attribute alarm_attr = {
647 .attr = {.name = "alarm", .mode = 0644},
648 .show = acpi_battery_alarm_show,
649 .store = acpi_battery_alarm_store,
650 };
651
652 /*
653 * The Battery Hooking API
654 *
655 * This API is used inside other drivers that need to expose
656 * platform-specific behaviour within the generic driver in a
657 * generic way.
658 *
659 */
660
661 static LIST_HEAD(acpi_battery_list);
662 static LIST_HEAD(battery_hook_list);
663 static DEFINE_MUTEX(hook_mutex);
664
665 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
666 {
667 struct acpi_battery *battery;
668 /*
669 * In order to remove a hook, we first need to
670 * de-register all the batteries that are registered.
671 */
672 if (lock)
673 mutex_lock(&hook_mutex);
674 list_for_each_entry(battery, &acpi_battery_list, list) {
675 hook->remove_battery(battery->bat);
676 }
677 list_del(&hook->list);
678 if (lock)
679 mutex_unlock(&hook_mutex);
680 pr_info("extension unregistered: %s\n", hook->name);
681 }
682
683 void battery_hook_unregister(struct acpi_battery_hook *hook)
684 {
685 __battery_hook_unregister(hook, 1);
686 }
687 EXPORT_SYMBOL_GPL(battery_hook_unregister);
688
689 void battery_hook_register(struct acpi_battery_hook *hook)
690 {
691 struct acpi_battery *battery;
692
693 mutex_lock(&hook_mutex);
694 INIT_LIST_HEAD(&hook->list);
695 list_add(&hook->list, &battery_hook_list);
696 /*
697 * Now that the driver is registered, we need
698 * to notify the hook that a battery is available
699 * for each battery, so that the driver may add
700 * its attributes.
701 */
702 list_for_each_entry(battery, &acpi_battery_list, list) {
703 if (hook->add_battery(battery->bat)) {
704 /*
705 * If a add-battery returns non-zero,
706 * the registration of the extension has failed,
707 * and we will not add it to the list of loaded
708 * hooks.
709 */
710 pr_err("extension failed to load: %s", hook->name);
711 __battery_hook_unregister(hook, 0);
712 return;
713 }
714 }
715 pr_info("new extension: %s\n", hook->name);
716 mutex_unlock(&hook_mutex);
717 }
718 EXPORT_SYMBOL_GPL(battery_hook_register);
719
720 /*
721 * This function gets called right after the battery sysfs
722 * attributes have been added, so that the drivers that
723 * define custom sysfs attributes can add their own.
724 */
725 static void battery_hook_add_battery(struct acpi_battery *battery)
726 {
727 struct acpi_battery_hook *hook_node;
728
729 mutex_lock(&hook_mutex);
730 INIT_LIST_HEAD(&battery->list);
731 list_add(&battery->list, &acpi_battery_list);
732 /*
733 * Since we added a new battery to the list, we need to
734 * iterate over the hooks and call add_battery for each
735 * hook that was registered. This usually happens
736 * when a battery gets hotplugged or initialized
737 * during the battery module initialization.
738 */
739 list_for_each_entry(hook_node, &battery_hook_list, list) {
740 if (hook_node->add_battery(battery->bat)) {
741 /*
742 * The notification of the extensions has failed, to
743 * prevent further errors we will unload the extension.
744 */
745 __battery_hook_unregister(hook_node, 0);
746 pr_err("error in extension, unloading: %s",
747 hook_node->name);
748 }
749 }
750 mutex_unlock(&hook_mutex);
751 }
752
753 static void battery_hook_remove_battery(struct acpi_battery *battery)
754 {
755 struct acpi_battery_hook *hook;
756
757 mutex_lock(&hook_mutex);
758 /*
759 * Before removing the hook, we need to remove all
760 * custom attributes from the battery.
761 */
762 list_for_each_entry(hook, &battery_hook_list, list) {
763 hook->remove_battery(battery->bat);
764 }
765 /* Then, just remove the battery from the list */
766 list_del(&battery->list);
767 mutex_unlock(&hook_mutex);
768 }
769
770 static void __exit battery_hook_exit(void)
771 {
772 struct acpi_battery_hook *hook;
773 struct acpi_battery_hook *ptr;
774 /*
775 * At this point, the acpi_bus_unregister_driver()
776 * has called remove for all batteries. We just
777 * need to remove the hooks.
778 */
779 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
780 __battery_hook_unregister(hook, 1);
781 }
782 mutex_destroy(&hook_mutex);
783 }
784
785 static int sysfs_add_battery(struct acpi_battery *battery)
786 {
787 struct power_supply_config psy_cfg = { .drv_data = battery, };
788
789 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
790 battery->bat_desc.properties = charge_battery_props;
791 battery->bat_desc.num_properties =
792 ARRAY_SIZE(charge_battery_props);
793 } else {
794 battery->bat_desc.properties = energy_battery_props;
795 battery->bat_desc.num_properties =
796 ARRAY_SIZE(energy_battery_props);
797 }
798
799 battery->bat_desc.name = acpi_device_bid(battery->device);
800 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
801 battery->bat_desc.get_property = acpi_battery_get_property;
802
803 battery->bat = power_supply_register_no_ws(&battery->device->dev,
804 &battery->bat_desc, &psy_cfg);
805
806 if (IS_ERR(battery->bat)) {
807 int result = PTR_ERR(battery->bat);
808
809 battery->bat = NULL;
810 return result;
811 }
812 battery_hook_add_battery(battery);
813 return device_create_file(&battery->bat->dev, &alarm_attr);
814 }
815
816 static void sysfs_remove_battery(struct acpi_battery *battery)
817 {
818 mutex_lock(&battery->sysfs_lock);
819 if (!battery->bat) {
820 mutex_unlock(&battery->sysfs_lock);
821 return;
822 }
823 battery_hook_remove_battery(battery);
824 device_remove_file(&battery->bat->dev, &alarm_attr);
825 power_supply_unregister(battery->bat);
826 battery->bat = NULL;
827 mutex_unlock(&battery->sysfs_lock);
828 }
829
830 static void find_battery(const struct dmi_header *dm, void *private)
831 {
832 struct acpi_battery *battery = (struct acpi_battery *)private;
833 /* Note: the hardcoded offsets below have been extracted from
834 the source code of dmidecode. */
835 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
836 const u8 *dmi_data = (const u8 *)(dm + 1);
837 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
838 if (dm->length >= 18)
839 dmi_capacity *= dmi_data[17];
840 if (battery->design_capacity * battery->design_voltage / 1000
841 != dmi_capacity &&
842 battery->design_capacity * 10 == dmi_capacity)
843 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
844 &battery->flags);
845 }
846 }
847
848 /*
849 * According to the ACPI spec, some kinds of primary batteries can
850 * report percentage battery remaining capacity directly to OS.
851 * In this case, it reports the Last Full Charged Capacity == 100
852 * and BatteryPresentRate == 0xFFFFFFFF.
853 *
854 * Now we found some battery reports percentage remaining capacity
855 * even if it's rechargeable.
856 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
857 *
858 * Handle this correctly so that they won't break userspace.
859 */
860 static void acpi_battery_quirks(struct acpi_battery *battery)
861 {
862 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
863 return;
864
865 if (battery->full_charge_capacity == 100 &&
866 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
867 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
868 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
869 battery->full_charge_capacity = battery->design_capacity;
870 battery->capacity_now = (battery->capacity_now *
871 battery->full_charge_capacity) / 100;
872 }
873
874 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
875 return;
876
877 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
878 const char *s;
879 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
880 if (s && !strncasecmp(s, "ThinkPad", 8)) {
881 dmi_walk(find_battery, battery);
882 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
883 &battery->flags) &&
884 battery->design_voltage) {
885 battery->design_capacity =
886 battery->design_capacity *
887 10000 / battery->design_voltage;
888 battery->full_charge_capacity =
889 battery->full_charge_capacity *
890 10000 / battery->design_voltage;
891 battery->design_capacity_warning =
892 battery->design_capacity_warning *
893 10000 / battery->design_voltage;
894 battery->capacity_now = battery->capacity_now *
895 10000 / battery->design_voltage;
896 }
897 }
898 }
899
900 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
901 return;
902
903 if (acpi_battery_is_degraded(battery) &&
904 battery->capacity_now > battery->full_charge_capacity) {
905 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
906 battery->capacity_now = battery->full_charge_capacity;
907 }
908 }
909
910 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
911 {
912 int result, old_present = acpi_battery_present(battery);
913 result = acpi_battery_get_status(battery);
914 if (result)
915 return result;
916 if (!acpi_battery_present(battery)) {
917 sysfs_remove_battery(battery);
918 battery->update_time = 0;
919 return 0;
920 }
921
922 if (resume)
923 return 0;
924
925 if (!battery->update_time ||
926 old_present != acpi_battery_present(battery)) {
927 result = acpi_battery_get_info(battery);
928 if (result)
929 return result;
930 acpi_battery_init_alarm(battery);
931 }
932
933 result = acpi_battery_get_state(battery);
934 if (result)
935 return result;
936 acpi_battery_quirks(battery);
937
938 if (!battery->bat) {
939 result = sysfs_add_battery(battery);
940 if (result)
941 return result;
942 }
943
944 /*
945 * Wakeup the system if battery is critical low
946 * or lower than the alarm level
947 */
948 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
949 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
950 (battery->capacity_now <= battery->alarm)))
951 acpi_pm_wakeup_event(&battery->device->dev);
952
953 return result;
954 }
955
956 static void acpi_battery_refresh(struct acpi_battery *battery)
957 {
958 int power_unit;
959
960 if (!battery->bat)
961 return;
962
963 power_unit = battery->power_unit;
964
965 acpi_battery_get_info(battery);
966
967 if (power_unit == battery->power_unit)
968 return;
969
970 /* The battery has changed its reporting units. */
971 sysfs_remove_battery(battery);
972 sysfs_add_battery(battery);
973 }
974
975 /* --------------------------------------------------------------------------
976 FS Interface (/proc)
977 -------------------------------------------------------------------------- */
978
979 #ifdef CONFIG_ACPI_PROCFS_POWER
980 static struct proc_dir_entry *acpi_battery_dir;
981
982 static const char *acpi_battery_units(const struct acpi_battery *battery)
983 {
984 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
985 "mA" : "mW";
986 }
987
988 static int acpi_battery_print_info(struct seq_file *seq, int result)
989 {
990 struct acpi_battery *battery = seq->private;
991
992 if (result)
993 goto end;
994
995 seq_printf(seq, "present: %s\n",
996 acpi_battery_present(battery) ? "yes" : "no");
997 if (!acpi_battery_present(battery))
998 goto end;
999 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
1000 seq_printf(seq, "design capacity: unknown\n");
1001 else
1002 seq_printf(seq, "design capacity: %d %sh\n",
1003 battery->design_capacity,
1004 acpi_battery_units(battery));
1005
1006 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
1007 seq_printf(seq, "last full capacity: unknown\n");
1008 else
1009 seq_printf(seq, "last full capacity: %d %sh\n",
1010 battery->full_charge_capacity,
1011 acpi_battery_units(battery));
1012
1013 seq_printf(seq, "battery technology: %srechargeable\n",
1014 (!battery->technology)?"non-":"");
1015
1016 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
1017 seq_printf(seq, "design voltage: unknown\n");
1018 else
1019 seq_printf(seq, "design voltage: %d mV\n",
1020 battery->design_voltage);
1021 seq_printf(seq, "design capacity warning: %d %sh\n",
1022 battery->design_capacity_warning,
1023 acpi_battery_units(battery));
1024 seq_printf(seq, "design capacity low: %d %sh\n",
1025 battery->design_capacity_low,
1026 acpi_battery_units(battery));
1027 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
1028 seq_printf(seq, "capacity granularity 1: %d %sh\n",
1029 battery->capacity_granularity_1,
1030 acpi_battery_units(battery));
1031 seq_printf(seq, "capacity granularity 2: %d %sh\n",
1032 battery->capacity_granularity_2,
1033 acpi_battery_units(battery));
1034 seq_printf(seq, "model number: %s\n", battery->model_number);
1035 seq_printf(seq, "serial number: %s\n", battery->serial_number);
1036 seq_printf(seq, "battery type: %s\n", battery->type);
1037 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
1038 end:
1039 if (result)
1040 seq_printf(seq, "ERROR: Unable to read battery info\n");
1041 return result;
1042 }
1043
1044 static int acpi_battery_print_state(struct seq_file *seq, int result)
1045 {
1046 struct acpi_battery *battery = seq->private;
1047
1048 if (result)
1049 goto end;
1050
1051 seq_printf(seq, "present: %s\n",
1052 acpi_battery_present(battery) ? "yes" : "no");
1053 if (!acpi_battery_present(battery))
1054 goto end;
1055
1056 seq_printf(seq, "capacity state: %s\n",
1057 (battery->state & 0x04) ? "critical" : "ok");
1058 if ((battery->state & 0x01) && (battery->state & 0x02))
1059 seq_printf(seq,
1060 "charging state: charging/discharging\n");
1061 else if (battery->state & 0x01)
1062 seq_printf(seq, "charging state: discharging\n");
1063 else if (battery->state & 0x02)
1064 seq_printf(seq, "charging state: charging\n");
1065 else
1066 seq_printf(seq, "charging state: charged\n");
1067
1068 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
1069 seq_printf(seq, "present rate: unknown\n");
1070 else
1071 seq_printf(seq, "present rate: %d %s\n",
1072 battery->rate_now, acpi_battery_units(battery));
1073
1074 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
1075 seq_printf(seq, "remaining capacity: unknown\n");
1076 else
1077 seq_printf(seq, "remaining capacity: %d %sh\n",
1078 battery->capacity_now, acpi_battery_units(battery));
1079 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
1080 seq_printf(seq, "present voltage: unknown\n");
1081 else
1082 seq_printf(seq, "present voltage: %d mV\n",
1083 battery->voltage_now);
1084 end:
1085 if (result)
1086 seq_printf(seq, "ERROR: Unable to read battery state\n");
1087
1088 return result;
1089 }
1090
1091 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
1092 {
1093 struct acpi_battery *battery = seq->private;
1094
1095 if (result)
1096 goto end;
1097
1098 if (!acpi_battery_present(battery)) {
1099 seq_printf(seq, "present: no\n");
1100 goto end;
1101 }
1102 seq_printf(seq, "alarm: ");
1103 if (!battery->alarm)
1104 seq_printf(seq, "unsupported\n");
1105 else
1106 seq_printf(seq, "%u %sh\n", battery->alarm,
1107 acpi_battery_units(battery));
1108 end:
1109 if (result)
1110 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
1111 return result;
1112 }
1113
1114 static ssize_t acpi_battery_write_alarm(struct file *file,
1115 const char __user * buffer,
1116 size_t count, loff_t * ppos)
1117 {
1118 int result = 0;
1119 char alarm_string[12] = { '\0' };
1120 struct seq_file *m = file->private_data;
1121 struct acpi_battery *battery = m->private;
1122
1123 if (!battery || (count > sizeof(alarm_string) - 1))
1124 return -EINVAL;
1125 if (!acpi_battery_present(battery)) {
1126 result = -ENODEV;
1127 goto end;
1128 }
1129 if (copy_from_user(alarm_string, buffer, count)) {
1130 result = -EFAULT;
1131 goto end;
1132 }
1133 alarm_string[count] = '\0';
1134 if (kstrtoint(alarm_string, 0, &battery->alarm)) {
1135 result = -EINVAL;
1136 goto end;
1137 }
1138 result = acpi_battery_set_alarm(battery);
1139 end:
1140 if (!result)
1141 return count;
1142 return result;
1143 }
1144
1145 typedef int(*print_func)(struct seq_file *seq, int result);
1146
1147 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
1148 acpi_battery_print_info,
1149 acpi_battery_print_state,
1150 acpi_battery_print_alarm,
1151 };
1152
1153 static int acpi_battery_read(int fid, struct seq_file *seq)
1154 {
1155 struct acpi_battery *battery = seq->private;
1156 int result = acpi_battery_update(battery, false);
1157 return acpi_print_funcs[fid](seq, result);
1158 }
1159
1160 #define DECLARE_FILE_FUNCTIONS(_name) \
1161 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
1162 { \
1163 return acpi_battery_read(_name##_tag, seq); \
1164 } \
1165 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
1166 { \
1167 return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \
1168 }
1169
1170 DECLARE_FILE_FUNCTIONS(info);
1171 DECLARE_FILE_FUNCTIONS(state);
1172 DECLARE_FILE_FUNCTIONS(alarm);
1173
1174 #undef DECLARE_FILE_FUNCTIONS
1175
1176 #define FILE_DESCRIPTION_RO(_name) \
1177 { \
1178 .name = __stringify(_name), \
1179 .mode = S_IRUGO, \
1180 .ops = { \
1181 .open = acpi_battery_##_name##_open_fs, \
1182 .read = seq_read, \
1183 .llseek = seq_lseek, \
1184 .release = single_release, \
1185 .owner = THIS_MODULE, \
1186 }, \
1187 }
1188
1189 #define FILE_DESCRIPTION_RW(_name) \
1190 { \
1191 .name = __stringify(_name), \
1192 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
1193 .ops = { \
1194 .open = acpi_battery_##_name##_open_fs, \
1195 .read = seq_read, \
1196 .llseek = seq_lseek, \
1197 .write = acpi_battery_write_##_name, \
1198 .release = single_release, \
1199 .owner = THIS_MODULE, \
1200 }, \
1201 }
1202
1203 static const struct battery_file {
1204 struct file_operations ops;
1205 umode_t mode;
1206 const char *name;
1207 } acpi_battery_file[] = {
1208 FILE_DESCRIPTION_RO(info),
1209 FILE_DESCRIPTION_RO(state),
1210 FILE_DESCRIPTION_RW(alarm),
1211 };
1212
1213 #undef FILE_DESCRIPTION_RO
1214 #undef FILE_DESCRIPTION_RW
1215
1216 static int acpi_battery_add_fs(struct acpi_device *device)
1217 {
1218 struct proc_dir_entry *entry = NULL;
1219 int i;
1220
1221 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
1222 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
1223 if (!acpi_device_dir(device)) {
1224 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1225 acpi_battery_dir);
1226 if (!acpi_device_dir(device))
1227 return -ENODEV;
1228 }
1229
1230 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
1231 entry = proc_create_data(acpi_battery_file[i].name,
1232 acpi_battery_file[i].mode,
1233 acpi_device_dir(device),
1234 &acpi_battery_file[i].ops,
1235 acpi_driver_data(device));
1236 if (!entry)
1237 return -ENODEV;
1238 }
1239 return 0;
1240 }
1241
1242 static void acpi_battery_remove_fs(struct acpi_device *device)
1243 {
1244 int i;
1245 if (!acpi_device_dir(device))
1246 return;
1247 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
1248 remove_proc_entry(acpi_battery_file[i].name,
1249 acpi_device_dir(device));
1250
1251 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
1252 acpi_device_dir(device) = NULL;
1253 }
1254
1255 #endif
1256
1257 /* --------------------------------------------------------------------------
1258 Driver Interface
1259 -------------------------------------------------------------------------- */
1260
1261 static void acpi_battery_notify(struct acpi_device *device, u32 event)
1262 {
1263 struct acpi_battery *battery = acpi_driver_data(device);
1264 struct power_supply *old;
1265
1266 if (!battery)
1267 return;
1268 old = battery->bat;
1269 /*
1270 * On Acer Aspire V5-573G notifications are sometimes triggered too
1271 * early. For example, when AC is unplugged and notification is
1272 * triggered, battery state is still reported as "Full", and changes to
1273 * "Discharging" only after short delay, without any notification.
1274 */
1275 if (battery_notification_delay_ms > 0)
1276 msleep(battery_notification_delay_ms);
1277 if (event == ACPI_BATTERY_NOTIFY_INFO)
1278 acpi_battery_refresh(battery);
1279 acpi_battery_update(battery, false);
1280 acpi_bus_generate_netlink_event(device->pnp.device_class,
1281 dev_name(&device->dev), event,
1282 acpi_battery_present(battery));
1283 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1284 /* acpi_battery_update could remove power_supply object */
1285 if (old && battery->bat)
1286 power_supply_changed(battery->bat);
1287 }
1288
1289 static int battery_notify(struct notifier_block *nb,
1290 unsigned long mode, void *_unused)
1291 {
1292 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1293 pm_nb);
1294 int result;
1295
1296 switch (mode) {
1297 case PM_POST_HIBERNATION:
1298 case PM_POST_SUSPEND:
1299 if (!acpi_battery_present(battery))
1300 return 0;
1301
1302 if (!battery->bat) {
1303 result = acpi_battery_get_info(battery);
1304 if (result)
1305 return result;
1306
1307 result = sysfs_add_battery(battery);
1308 if (result)
1309 return result;
1310 } else
1311 acpi_battery_refresh(battery);
1312
1313 acpi_battery_init_alarm(battery);
1314 acpi_battery_get_state(battery);
1315 break;
1316 }
1317
1318 return 0;
1319 }
1320
1321 static int __init
1322 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1323 {
1324 battery_bix_broken_package = 1;
1325 return 0;
1326 }
1327
1328 static int __init
1329 battery_notification_delay_quirk(const struct dmi_system_id *d)
1330 {
1331 battery_notification_delay_ms = 1000;
1332 return 0;
1333 }
1334
1335 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1336 {
1337 .callback = battery_bix_broken_package_quirk,
1338 .ident = "NEC LZ750/LS",
1339 .matches = {
1340 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1341 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1342 },
1343 },
1344 {
1345 .callback = battery_notification_delay_quirk,
1346 .ident = "Acer Aspire V5-573G",
1347 .matches = {
1348 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1349 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1350 },
1351 },
1352 {},
1353 };
1354
1355 /*
1356 * Some machines'(E,G Lenovo Z480) ECs are not stable
1357 * during boot up and this causes battery driver fails to be
1358 * probed due to failure of getting battery information
1359 * from EC sometimes. After several retries, the operation
1360 * may work. So add retry code here and 20ms sleep between
1361 * every retries.
1362 */
1363 static int acpi_battery_update_retry(struct acpi_battery *battery)
1364 {
1365 int retry, ret;
1366
1367 for (retry = 5; retry; retry--) {
1368 ret = acpi_battery_update(battery, false);
1369 if (!ret)
1370 break;
1371
1372 msleep(20);
1373 }
1374 return ret;
1375 }
1376
1377 static int acpi_battery_add(struct acpi_device *device)
1378 {
1379 int result = 0;
1380 struct acpi_battery *battery = NULL;
1381
1382 if (!device)
1383 return -EINVAL;
1384
1385 if (device->dep_unmet)
1386 return -EPROBE_DEFER;
1387
1388 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1389 if (!battery)
1390 return -ENOMEM;
1391 battery->device = device;
1392 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1393 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1394 device->driver_data = battery;
1395 mutex_init(&battery->lock);
1396 mutex_init(&battery->sysfs_lock);
1397 if (acpi_has_method(battery->device->handle, "_BIX"))
1398 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1399
1400 result = acpi_battery_update_retry(battery);
1401 if (result)
1402 goto fail;
1403
1404 #ifdef CONFIG_ACPI_PROCFS_POWER
1405 result = acpi_battery_add_fs(device);
1406 if (result) {
1407 acpi_battery_remove_fs(device);
1408 goto fail;
1409 }
1410 #endif
1411
1412 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1413 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1414 device->status.battery_present ? "present" : "absent");
1415
1416 battery->pm_nb.notifier_call = battery_notify;
1417 register_pm_notifier(&battery->pm_nb);
1418
1419 device_init_wakeup(&device->dev, 1);
1420
1421 return result;
1422
1423 fail:
1424 sysfs_remove_battery(battery);
1425 mutex_destroy(&battery->lock);
1426 mutex_destroy(&battery->sysfs_lock);
1427 kfree(battery);
1428 return result;
1429 }
1430
1431 static int acpi_battery_remove(struct acpi_device *device)
1432 {
1433 struct acpi_battery *battery = NULL;
1434
1435 if (!device || !acpi_driver_data(device))
1436 return -EINVAL;
1437 device_init_wakeup(&device->dev, 0);
1438 battery = acpi_driver_data(device);
1439 unregister_pm_notifier(&battery->pm_nb);
1440 #ifdef CONFIG_ACPI_PROCFS_POWER
1441 acpi_battery_remove_fs(device);
1442 #endif
1443 sysfs_remove_battery(battery);
1444 mutex_destroy(&battery->lock);
1445 mutex_destroy(&battery->sysfs_lock);
1446 kfree(battery);
1447 return 0;
1448 }
1449
1450 #ifdef CONFIG_PM_SLEEP
1451 /* this is needed to learn about changes made in suspended state */
1452 static int acpi_battery_resume(struct device *dev)
1453 {
1454 struct acpi_battery *battery;
1455
1456 if (!dev)
1457 return -EINVAL;
1458
1459 battery = acpi_driver_data(to_acpi_device(dev));
1460 if (!battery)
1461 return -EINVAL;
1462
1463 battery->update_time = 0;
1464 acpi_battery_update(battery, true);
1465 return 0;
1466 }
1467 #else
1468 #define acpi_battery_resume NULL
1469 #endif
1470
1471 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1472
1473 static struct acpi_driver acpi_battery_driver = {
1474 .name = "battery",
1475 .class = ACPI_BATTERY_CLASS,
1476 .ids = battery_device_ids,
1477 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1478 .ops = {
1479 .add = acpi_battery_add,
1480 .remove = acpi_battery_remove,
1481 .notify = acpi_battery_notify,
1482 },
1483 .drv.pm = &acpi_battery_pm,
1484 };
1485
1486 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1487 {
1488 unsigned int i;
1489 int result;
1490
1491 for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
1492 if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
1493 pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME
1494 ": found native %s PMIC, not loading\n",
1495 acpi_battery_blacklist[i]);
1496 return;
1497 }
1498
1499 dmi_check_system(bat_dmi_table);
1500
1501 #ifdef CONFIG_ACPI_PROCFS_POWER
1502 acpi_battery_dir = acpi_lock_battery_dir();
1503 if (!acpi_battery_dir)
1504 return;
1505 #endif
1506 result = acpi_bus_register_driver(&acpi_battery_driver);
1507 #ifdef CONFIG_ACPI_PROCFS_POWER
1508 if (result < 0)
1509 acpi_unlock_battery_dir(acpi_battery_dir);
1510 #endif
1511 battery_driver_registered = (result == 0);
1512 }
1513
1514 static int __init acpi_battery_init(void)
1515 {
1516 if (acpi_disabled)
1517 return -ENODEV;
1518
1519 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1520 return 0;
1521 }
1522
1523 static void __exit acpi_battery_exit(void)
1524 {
1525 async_synchronize_cookie(async_cookie + 1);
1526 if (battery_driver_registered) {
1527 acpi_bus_unregister_driver(&acpi_battery_driver);
1528 battery_hook_exit();
1529 }
1530 #ifdef CONFIG_ACPI_PROCFS_POWER
1531 if (acpi_battery_dir)
1532 acpi_unlock_battery_dir(acpi_battery_dir);
1533 #endif
1534 }
1535
1536 module_init(acpi_battery_init);
1537 module_exit(acpi_battery_exit);
Linux with added FPC-III support