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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * battery.c - ACPI Battery Driver (Revision: 2.0)
4 *
5 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
6 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
7 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
8 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/async.h>
14#include <linux/delay.h>
15#include <linux/dmi.h>
16#include <linux/jiffies.h>
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/slab.h>
22#include <linux/suspend.h>
23#include <linux/types.h>
24
25#include <asm/unaligned.h>
26
27#ifdef CONFIG_ACPI_PROCFS_POWER
28#include <linux/proc_fs.h>
29#include <linux/seq_file.h>
30#include <linux/uaccess.h>
31#endif
32
33#include <linux/acpi.h>
34#include <linux/power_supply.h>
35
36#include <acpi/battery.h>
37
38#define PREFIX "ACPI: "
39
40#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
41
42#define ACPI_BATTERY_DEVICE_NAME "Battery"
43
44/* Battery power unit: 0 means mW, 1 means mA */
45#define ACPI_BATTERY_POWER_UNIT_MA 1
46
47#define ACPI_BATTERY_STATE_DISCHARGING 0x1
48#define ACPI_BATTERY_STATE_CHARGING 0x2
49#define ACPI_BATTERY_STATE_CRITICAL 0x4
50
51#define _COMPONENT ACPI_BATTERY_COMPONENT
52
53ACPI_MODULE_NAME("battery");
54
55MODULE_AUTHOR("Paul Diefenbaugh");
56MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
57MODULE_DESCRIPTION("ACPI Battery Driver");
58MODULE_LICENSE("GPL");
59
60static async_cookie_t async_cookie;
61static bool battery_driver_registered;
62static int battery_bix_broken_package;
63static int battery_notification_delay_ms;
64static int battery_ac_is_broken;
65static int battery_check_pmic = 1;
66static unsigned int cache_time = 1000;
67module_param(cache_time, uint, 0644);
68MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
69
70#ifdef CONFIG_ACPI_PROCFS_POWER
71extern struct proc_dir_entry *acpi_lock_battery_dir(void);
72extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
73#endif
74
75static const struct acpi_device_id battery_device_ids[] = {
76 {"PNP0C0A", 0},
77 {"", 0},
78};
79
80MODULE_DEVICE_TABLE(acpi, battery_device_ids);
81
82/* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
83static const char * const acpi_battery_blacklist[] = {
84 "INT33F4", /* X-Powers AXP288 PMIC */
85};
86
87enum {
88 ACPI_BATTERY_ALARM_PRESENT,
89 ACPI_BATTERY_XINFO_PRESENT,
90 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
91 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
92 switches between mWh and mAh depending on whether the system
93 is running on battery or not. When mAh is the unit, most
94 reported values are incorrect and need to be adjusted by
95 10000/design_voltage. Verified on x201, t410, t410s, and x220.
96 Pre-2010 and 2012 models appear to always report in mWh and
97 are thus unaffected (tested with t42, t61, t500, x200, x300,
98 and x230). Also, in mid-2012 Lenovo issued a BIOS update for
99 the 2011 models that fixes the issue (tested on x220 with a
100 post-1.29 BIOS), but as of Nov. 2012, no such update is
101 available for the 2010 models. */
102 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
103 /* for batteries reporting current capacity with design capacity
104 * on a full charge, but showing degradation in full charge cap.
105 */
106 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
107};
108
109struct acpi_battery {
110 struct mutex lock;
111 struct mutex sysfs_lock;
112 struct power_supply *bat;
113 struct power_supply_desc bat_desc;
114 struct acpi_device *device;
115 struct notifier_block pm_nb;
116 struct list_head list;
117 unsigned long update_time;
118 int revision;
119 int rate_now;
120 int capacity_now;
121 int voltage_now;
122 int design_capacity;
123 int full_charge_capacity;
124 int technology;
125 int design_voltage;
126 int design_capacity_warning;
127 int design_capacity_low;
128 int cycle_count;
129 int measurement_accuracy;
130 int max_sampling_time;
131 int min_sampling_time;
132 int max_averaging_interval;
133 int min_averaging_interval;
134 int capacity_granularity_1;
135 int capacity_granularity_2;
136 int alarm;
137 char model_number[32];
138 char serial_number[32];
139 char type[32];
140 char oem_info[32];
141 int state;
142 int power_unit;
143 unsigned long flags;
144};
145
146#define to_acpi_battery(x) power_supply_get_drvdata(x)
147
148static inline int acpi_battery_present(struct acpi_battery *battery)
149{
150 return battery->device->status.battery_present;
151}
152
153static int acpi_battery_technology(struct acpi_battery *battery)
154{
155 if (!strcasecmp("NiCd", battery->type))
156 return POWER_SUPPLY_TECHNOLOGY_NiCd;
157 if (!strcasecmp("NiMH", battery->type))
158 return POWER_SUPPLY_TECHNOLOGY_NiMH;
159 if (!strcasecmp("LION", battery->type))
160 return POWER_SUPPLY_TECHNOLOGY_LION;
161 if (!strncasecmp("LI-ION", battery->type, 6))
162 return POWER_SUPPLY_TECHNOLOGY_LION;
163 if (!strcasecmp("LiP", battery->type))
164 return POWER_SUPPLY_TECHNOLOGY_LIPO;
165 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
166}
167
168static int acpi_battery_get_state(struct acpi_battery *battery);
169
170static int acpi_battery_is_charged(struct acpi_battery *battery)
171{
172 /* charging, discharging or critical low */
173 if (battery->state != 0)
174 return 0;
175
176 /* battery not reporting charge */
177 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
178 battery->capacity_now == 0)
179 return 0;
180
181 /* good batteries update full_charge as the batteries degrade */
182 if (battery->full_charge_capacity == battery->capacity_now)
183 return 1;
184
185 /* fallback to using design values for broken batteries */
186 if (battery->design_capacity == battery->capacity_now)
187 return 1;
188
189 /* we don't do any sort of metric based on percentages */
190 return 0;
191}
192
193static bool acpi_battery_is_degraded(struct acpi_battery *battery)
194{
195 return battery->full_charge_capacity && battery->design_capacity &&
196 battery->full_charge_capacity < battery->design_capacity;
197}
198
199static int acpi_battery_handle_discharging(struct acpi_battery *battery)
200{
201 /*
202 * Some devices wrongly report discharging if the battery's charge level
203 * was above the device's start charging threshold atm the AC adapter
204 * was plugged in and the device thus did not start a new charge cycle.
205 */
206 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
207 battery->rate_now == 0)
208 return POWER_SUPPLY_STATUS_NOT_CHARGING;
209
210 return POWER_SUPPLY_STATUS_DISCHARGING;
211}
212
213static int acpi_battery_get_property(struct power_supply *psy,
214 enum power_supply_property psp,
215 union power_supply_propval *val)
216{
217 int ret = 0;
218 struct acpi_battery *battery = to_acpi_battery(psy);
219
220 if (acpi_battery_present(battery)) {
221 /* run battery update only if it is present */
222 acpi_battery_get_state(battery);
223 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
224 return -ENODEV;
225 switch (psp) {
226 case POWER_SUPPLY_PROP_STATUS:
227 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
228 val->intval = acpi_battery_handle_discharging(battery);
229 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
230 val->intval = POWER_SUPPLY_STATUS_CHARGING;
231 else if (acpi_battery_is_charged(battery))
232 val->intval = POWER_SUPPLY_STATUS_FULL;
233 else
234 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
235 break;
236 case POWER_SUPPLY_PROP_PRESENT:
237 val->intval = acpi_battery_present(battery);
238 break;
239 case POWER_SUPPLY_PROP_TECHNOLOGY:
240 val->intval = acpi_battery_technology(battery);
241 break;
242 case POWER_SUPPLY_PROP_CYCLE_COUNT:
243 val->intval = battery->cycle_count;
244 break;
245 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
246 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
247 ret = -ENODEV;
248 else
249 val->intval = battery->design_voltage * 1000;
250 break;
251 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
252 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
253 ret = -ENODEV;
254 else
255 val->intval = battery->voltage_now * 1000;
256 break;
257 case POWER_SUPPLY_PROP_CURRENT_NOW:
258 case POWER_SUPPLY_PROP_POWER_NOW:
259 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
260 ret = -ENODEV;
261 else
262 val->intval = battery->rate_now * 1000;
263 break;
264 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
265 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
266 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
267 ret = -ENODEV;
268 else
269 val->intval = battery->design_capacity * 1000;
270 break;
271 case POWER_SUPPLY_PROP_CHARGE_FULL:
272 case POWER_SUPPLY_PROP_ENERGY_FULL:
273 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
274 ret = -ENODEV;
275 else
276 val->intval = battery->full_charge_capacity * 1000;
277 break;
278 case POWER_SUPPLY_PROP_CHARGE_NOW:
279 case POWER_SUPPLY_PROP_ENERGY_NOW:
280 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
281 ret = -ENODEV;
282 else
283 val->intval = battery->capacity_now * 1000;
284 break;
285 case POWER_SUPPLY_PROP_CAPACITY:
286 if (battery->capacity_now && battery->full_charge_capacity)
287 val->intval = battery->capacity_now * 100/
288 battery->full_charge_capacity;
289 else
290 val->intval = 0;
291 break;
292 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
293 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
294 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
295 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
296 (battery->capacity_now <= battery->alarm))
297 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
298 else if (acpi_battery_is_charged(battery))
299 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
300 else
301 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
302 break;
303 case POWER_SUPPLY_PROP_MODEL_NAME:
304 val->strval = battery->model_number;
305 break;
306 case POWER_SUPPLY_PROP_MANUFACTURER:
307 val->strval = battery->oem_info;
308 break;
309 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
310 val->strval = battery->serial_number;
311 break;
312 default:
313 ret = -EINVAL;
314 }
315 return ret;
316}
317
318static enum power_supply_property charge_battery_props[] = {
319 POWER_SUPPLY_PROP_STATUS,
320 POWER_SUPPLY_PROP_PRESENT,
321 POWER_SUPPLY_PROP_TECHNOLOGY,
322 POWER_SUPPLY_PROP_CYCLE_COUNT,
323 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
324 POWER_SUPPLY_PROP_VOLTAGE_NOW,
325 POWER_SUPPLY_PROP_CURRENT_NOW,
326 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
327 POWER_SUPPLY_PROP_CHARGE_FULL,
328 POWER_SUPPLY_PROP_CHARGE_NOW,
329 POWER_SUPPLY_PROP_CAPACITY,
330 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
331 POWER_SUPPLY_PROP_MODEL_NAME,
332 POWER_SUPPLY_PROP_MANUFACTURER,
333 POWER_SUPPLY_PROP_SERIAL_NUMBER,
334};
335
336static enum power_supply_property energy_battery_props[] = {
337 POWER_SUPPLY_PROP_STATUS,
338 POWER_SUPPLY_PROP_PRESENT,
339 POWER_SUPPLY_PROP_TECHNOLOGY,
340 POWER_SUPPLY_PROP_CYCLE_COUNT,
341 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
342 POWER_SUPPLY_PROP_VOLTAGE_NOW,
343 POWER_SUPPLY_PROP_POWER_NOW,
344 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
345 POWER_SUPPLY_PROP_ENERGY_FULL,
346 POWER_SUPPLY_PROP_ENERGY_NOW,
347 POWER_SUPPLY_PROP_CAPACITY,
348 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
349 POWER_SUPPLY_PROP_MODEL_NAME,
350 POWER_SUPPLY_PROP_MANUFACTURER,
351 POWER_SUPPLY_PROP_SERIAL_NUMBER,
352};
353
354static enum power_supply_property energy_battery_full_cap_broken_props[] = {
355 POWER_SUPPLY_PROP_STATUS,
356 POWER_SUPPLY_PROP_PRESENT,
357 POWER_SUPPLY_PROP_TECHNOLOGY,
358 POWER_SUPPLY_PROP_CYCLE_COUNT,
359 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
360 POWER_SUPPLY_PROP_VOLTAGE_NOW,
361 POWER_SUPPLY_PROP_POWER_NOW,
362 POWER_SUPPLY_PROP_ENERGY_NOW,
363 POWER_SUPPLY_PROP_MODEL_NAME,
364 POWER_SUPPLY_PROP_MANUFACTURER,
365 POWER_SUPPLY_PROP_SERIAL_NUMBER,
366};
367
368/* --------------------------------------------------------------------------
369 Battery Management
370 -------------------------------------------------------------------------- */
371struct acpi_offsets {
372 size_t offset; /* offset inside struct acpi_sbs_battery */
373 u8 mode; /* int or string? */
374};
375
376static const struct acpi_offsets state_offsets[] = {
377 {offsetof(struct acpi_battery, state), 0},
378 {offsetof(struct acpi_battery, rate_now), 0},
379 {offsetof(struct acpi_battery, capacity_now), 0},
380 {offsetof(struct acpi_battery, voltage_now), 0},
381};
382
383static const struct acpi_offsets info_offsets[] = {
384 {offsetof(struct acpi_battery, power_unit), 0},
385 {offsetof(struct acpi_battery, design_capacity), 0},
386 {offsetof(struct acpi_battery, full_charge_capacity), 0},
387 {offsetof(struct acpi_battery, technology), 0},
388 {offsetof(struct acpi_battery, design_voltage), 0},
389 {offsetof(struct acpi_battery, design_capacity_warning), 0},
390 {offsetof(struct acpi_battery, design_capacity_low), 0},
391 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
392 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
393 {offsetof(struct acpi_battery, model_number), 1},
394 {offsetof(struct acpi_battery, serial_number), 1},
395 {offsetof(struct acpi_battery, type), 1},
396 {offsetof(struct acpi_battery, oem_info), 1},
397};
398
399static const struct acpi_offsets extended_info_offsets[] = {
400 {offsetof(struct acpi_battery, revision), 0},
401 {offsetof(struct acpi_battery, power_unit), 0},
402 {offsetof(struct acpi_battery, design_capacity), 0},
403 {offsetof(struct acpi_battery, full_charge_capacity), 0},
404 {offsetof(struct acpi_battery, technology), 0},
405 {offsetof(struct acpi_battery, design_voltage), 0},
406 {offsetof(struct acpi_battery, design_capacity_warning), 0},
407 {offsetof(struct acpi_battery, design_capacity_low), 0},
408 {offsetof(struct acpi_battery, cycle_count), 0},
409 {offsetof(struct acpi_battery, measurement_accuracy), 0},
410 {offsetof(struct acpi_battery, max_sampling_time), 0},
411 {offsetof(struct acpi_battery, min_sampling_time), 0},
412 {offsetof(struct acpi_battery, max_averaging_interval), 0},
413 {offsetof(struct acpi_battery, min_averaging_interval), 0},
414 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
415 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
416 {offsetof(struct acpi_battery, model_number), 1},
417 {offsetof(struct acpi_battery, serial_number), 1},
418 {offsetof(struct acpi_battery, type), 1},
419 {offsetof(struct acpi_battery, oem_info), 1},
420};
421
422static int extract_package(struct acpi_battery *battery,
423 union acpi_object *package,
424 const struct acpi_offsets *offsets, int num)
425{
426 int i;
427 union acpi_object *element;
428 if (package->type != ACPI_TYPE_PACKAGE)
429 return -EFAULT;
430 for (i = 0; i < num; ++i) {
431 if (package->package.count <= i)
432 return -EFAULT;
433 element = &package->package.elements[i];
434 if (offsets[i].mode) {
435 u8 *ptr = (u8 *)battery + offsets[i].offset;
436 if (element->type == ACPI_TYPE_STRING ||
437 element->type == ACPI_TYPE_BUFFER)
438 strncpy(ptr, element->string.pointer, 32);
439 else if (element->type == ACPI_TYPE_INTEGER) {
440 strncpy(ptr, (u8 *)&element->integer.value,
441 sizeof(u64));
442 ptr[sizeof(u64)] = 0;
443 } else
444 *ptr = 0; /* don't have value */
445 } else {
446 int *x = (int *)((u8 *)battery + offsets[i].offset);
447 *x = (element->type == ACPI_TYPE_INTEGER) ?
448 element->integer.value : -1;
449 }
450 }
451 return 0;
452}
453
454static int acpi_battery_get_status(struct acpi_battery *battery)
455{
456 if (acpi_bus_get_status(battery->device)) {
457 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
458 return -ENODEV;
459 }
460 return 0;
461}
462
463
464static int extract_battery_info(const int use_bix,
465 struct acpi_battery *battery,
466 const struct acpi_buffer *buffer)
467{
468 int result = -EFAULT;
469
470 if (use_bix && battery_bix_broken_package)
471 result = extract_package(battery, buffer->pointer,
472 extended_info_offsets + 1,
473 ARRAY_SIZE(extended_info_offsets) - 1);
474 else if (use_bix)
475 result = extract_package(battery, buffer->pointer,
476 extended_info_offsets,
477 ARRAY_SIZE(extended_info_offsets));
478 else
479 result = extract_package(battery, buffer->pointer,
480 info_offsets, ARRAY_SIZE(info_offsets));
481 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
482 battery->full_charge_capacity = battery->design_capacity;
483 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
484 battery->power_unit && battery->design_voltage) {
485 battery->design_capacity = battery->design_capacity *
486 10000 / battery->design_voltage;
487 battery->full_charge_capacity = battery->full_charge_capacity *
488 10000 / battery->design_voltage;
489 battery->design_capacity_warning =
490 battery->design_capacity_warning *
491 10000 / battery->design_voltage;
492 /* Curiously, design_capacity_low, unlike the rest of them,
493 is correct. */
494 /* capacity_granularity_* equal 1 on the systems tested, so
495 it's impossible to tell if they would need an adjustment
496 or not if their values were higher. */
497 }
498 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
499 battery->capacity_now > battery->full_charge_capacity)
500 battery->capacity_now = battery->full_charge_capacity;
501
502 return result;
503}
504
505static int acpi_battery_get_info(struct acpi_battery *battery)
506{
507 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
508 int use_bix;
509 int result = -ENODEV;
510
511 if (!acpi_battery_present(battery))
512 return 0;
513
514
515 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
516 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
517 acpi_status status = AE_ERROR;
518
519 mutex_lock(&battery->lock);
520 status = acpi_evaluate_object(battery->device->handle,
521 use_bix ? "_BIX":"_BIF",
522 NULL, &buffer);
523 mutex_unlock(&battery->lock);
524
525 if (ACPI_FAILURE(status)) {
526 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s",
527 use_bix ? "_BIX":"_BIF"));
528 } else {
529 result = extract_battery_info(use_bix,
530 battery,
531 &buffer);
532
533 kfree(buffer.pointer);
534 break;
535 }
536 }
537
538 if (!result && !use_bix && xinfo)
539 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
540
541 return result;
542}
543
544static int acpi_battery_get_state(struct acpi_battery *battery)
545{
546 int result = 0;
547 acpi_status status = 0;
548 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
549
550 if (!acpi_battery_present(battery))
551 return 0;
552
553 if (battery->update_time &&
554 time_before(jiffies, battery->update_time +
555 msecs_to_jiffies(cache_time)))
556 return 0;
557
558 mutex_lock(&battery->lock);
559 status = acpi_evaluate_object(battery->device->handle, "_BST",
560 NULL, &buffer);
561 mutex_unlock(&battery->lock);
562
563 if (ACPI_FAILURE(status)) {
564 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
565 return -ENODEV;
566 }
567
568 result = extract_package(battery, buffer.pointer,
569 state_offsets, ARRAY_SIZE(state_offsets));
570 battery->update_time = jiffies;
571 kfree(buffer.pointer);
572
573 /* For buggy DSDTs that report negative 16-bit values for either
574 * charging or discharging current and/or report 0 as 65536
575 * due to bad math.
576 */
577 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
578 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
579 (s16)(battery->rate_now) < 0) {
580 battery->rate_now = abs((s16)battery->rate_now);
581 pr_warn_once(FW_BUG "battery: (dis)charge rate invalid.\n");
582 }
583
584 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
585 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
586 battery->capacity_now = (battery->capacity_now *
587 battery->full_charge_capacity) / 100;
588 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
589 battery->power_unit && battery->design_voltage) {
590 battery->capacity_now = battery->capacity_now *
591 10000 / battery->design_voltage;
592 }
593 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
594 battery->capacity_now > battery->full_charge_capacity)
595 battery->capacity_now = battery->full_charge_capacity;
596
597 return result;
598}
599
600static int acpi_battery_set_alarm(struct acpi_battery *battery)
601{
602 acpi_status status = 0;
603
604 if (!acpi_battery_present(battery) ||
605 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
606 return -ENODEV;
607
608 mutex_lock(&battery->lock);
609 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
610 battery->alarm);
611 mutex_unlock(&battery->lock);
612
613 if (ACPI_FAILURE(status))
614 return -ENODEV;
615
616 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
617 return 0;
618}
619
620static int acpi_battery_init_alarm(struct acpi_battery *battery)
621{
622 /* See if alarms are supported, and if so, set default */
623 if (!acpi_has_method(battery->device->handle, "_BTP")) {
624 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
625 return 0;
626 }
627 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
628 if (!battery->alarm)
629 battery->alarm = battery->design_capacity_warning;
630 return acpi_battery_set_alarm(battery);
631}
632
633static ssize_t acpi_battery_alarm_show(struct device *dev,
634 struct device_attribute *attr,
635 char *buf)
636{
637 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
638 return sprintf(buf, "%d\n", battery->alarm * 1000);
639}
640
641static ssize_t acpi_battery_alarm_store(struct device *dev,
642 struct device_attribute *attr,
643 const char *buf, size_t count)
644{
645 unsigned long x;
646 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
647 if (sscanf(buf, "%lu\n", &x) == 1)
648 battery->alarm = x/1000;
649 if (acpi_battery_present(battery))
650 acpi_battery_set_alarm(battery);
651 return count;
652}
653
654static const struct device_attribute alarm_attr = {
655 .attr = {.name = "alarm", .mode = 0644},
656 .show = acpi_battery_alarm_show,
657 .store = acpi_battery_alarm_store,
658};
659
660/*
661 * The Battery Hooking API
662 *
663 * This API is used inside other drivers that need to expose
664 * platform-specific behaviour within the generic driver in a
665 * generic way.
666 *
667 */
668
669static LIST_HEAD(acpi_battery_list);
670static LIST_HEAD(battery_hook_list);
671static DEFINE_MUTEX(hook_mutex);
672
673static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
674{
675 struct acpi_battery *battery;
676 /*
677 * In order to remove a hook, we first need to
678 * de-register all the batteries that are registered.
679 */
680 if (lock)
681 mutex_lock(&hook_mutex);
682 list_for_each_entry(battery, &acpi_battery_list, list) {
683 hook->remove_battery(battery->bat);
684 }
685 list_del(&hook->list);
686 if (lock)
687 mutex_unlock(&hook_mutex);
688 pr_info("extension unregistered: %s\n", hook->name);
689}
690
691void battery_hook_unregister(struct acpi_battery_hook *hook)
692{
693 __battery_hook_unregister(hook, 1);
694}
695EXPORT_SYMBOL_GPL(battery_hook_unregister);
696
697void battery_hook_register(struct acpi_battery_hook *hook)
698{
699 struct acpi_battery *battery;
700
701 mutex_lock(&hook_mutex);
702 INIT_LIST_HEAD(&hook->list);
703 list_add(&hook->list, &battery_hook_list);
704 /*
705 * Now that the driver is registered, we need
706 * to notify the hook that a battery is available
707 * for each battery, so that the driver may add
708 * its attributes.
709 */
710 list_for_each_entry(battery, &acpi_battery_list, list) {
711 if (hook->add_battery(battery->bat)) {
712 /*
713 * If a add-battery returns non-zero,
714 * the registration of the extension has failed,
715 * and we will not add it to the list of loaded
716 * hooks.
717 */
718 pr_err("extension failed to load: %s", hook->name);
719 __battery_hook_unregister(hook, 0);
720 goto end;
721 }
722 }
723 pr_info("new extension: %s\n", hook->name);
724end:
725 mutex_unlock(&hook_mutex);
726}
727EXPORT_SYMBOL_GPL(battery_hook_register);
728
729/*
730 * This function gets called right after the battery sysfs
731 * attributes have been added, so that the drivers that
732 * define custom sysfs attributes can add their own.
733*/
734static void battery_hook_add_battery(struct acpi_battery *battery)
735{
736 struct acpi_battery_hook *hook_node, *tmp;
737
738 mutex_lock(&hook_mutex);
739 INIT_LIST_HEAD(&battery->list);
740 list_add(&battery->list, &acpi_battery_list);
741 /*
742 * Since we added a new battery to the list, we need to
743 * iterate over the hooks and call add_battery for each
744 * hook that was registered. This usually happens
745 * when a battery gets hotplugged or initialized
746 * during the battery module initialization.
747 */
748 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
749 if (hook_node->add_battery(battery->bat)) {
750 /*
751 * The notification of the extensions has failed, to
752 * prevent further errors we will unload the extension.
753 */
754 pr_err("error in extension, unloading: %s",
755 hook_node->name);
756 __battery_hook_unregister(hook_node, 0);
757 }
758 }
759 mutex_unlock(&hook_mutex);
760}
761
762static void battery_hook_remove_battery(struct acpi_battery *battery)
763{
764 struct acpi_battery_hook *hook;
765
766 mutex_lock(&hook_mutex);
767 /*
768 * Before removing the hook, we need to remove all
769 * custom attributes from the battery.
770 */
771 list_for_each_entry(hook, &battery_hook_list, list) {
772 hook->remove_battery(battery->bat);
773 }
774 /* Then, just remove the battery from the list */
775 list_del(&battery->list);
776 mutex_unlock(&hook_mutex);
777}
778
779static void __exit battery_hook_exit(void)
780{
781 struct acpi_battery_hook *hook;
782 struct acpi_battery_hook *ptr;
783 /*
784 * At this point, the acpi_bus_unregister_driver()
785 * has called remove for all batteries. We just
786 * need to remove the hooks.
787 */
788 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
789 __battery_hook_unregister(hook, 1);
790 }
791 mutex_destroy(&hook_mutex);
792}
793
794static int sysfs_add_battery(struct acpi_battery *battery)
795{
796 struct power_supply_config psy_cfg = { .drv_data = battery, };
797
798 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
799 battery->bat_desc.properties = charge_battery_props;
800 battery->bat_desc.num_properties =
801 ARRAY_SIZE(charge_battery_props);
802 } else if (battery->full_charge_capacity == 0) {
803 battery->bat_desc.properties =
804 energy_battery_full_cap_broken_props;
805 battery->bat_desc.num_properties =
806 ARRAY_SIZE(energy_battery_full_cap_broken_props);
807 } else {
808 battery->bat_desc.properties = energy_battery_props;
809 battery->bat_desc.num_properties =
810 ARRAY_SIZE(energy_battery_props);
811 }
812
813 battery->bat_desc.name = acpi_device_bid(battery->device);
814 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
815 battery->bat_desc.get_property = acpi_battery_get_property;
816
817 battery->bat = power_supply_register_no_ws(&battery->device->dev,
818 &battery->bat_desc, &psy_cfg);
819
820 if (IS_ERR(battery->bat)) {
821 int result = PTR_ERR(battery->bat);
822
823 battery->bat = NULL;
824 return result;
825 }
826 battery_hook_add_battery(battery);
827 return device_create_file(&battery->bat->dev, &alarm_attr);
828}
829
830static void sysfs_remove_battery(struct acpi_battery *battery)
831{
832 mutex_lock(&battery->sysfs_lock);
833 if (!battery->bat) {
834 mutex_unlock(&battery->sysfs_lock);
835 return;
836 }
837 battery_hook_remove_battery(battery);
838 device_remove_file(&battery->bat->dev, &alarm_attr);
839 power_supply_unregister(battery->bat);
840 battery->bat = NULL;
841 mutex_unlock(&battery->sysfs_lock);
842}
843
844static void find_battery(const struct dmi_header *dm, void *private)
845{
846 struct acpi_battery *battery = (struct acpi_battery *)private;
847 /* Note: the hardcoded offsets below have been extracted from
848 the source code of dmidecode. */
849 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
850 const u8 *dmi_data = (const u8 *)(dm + 1);
851 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
852 if (dm->length >= 18)
853 dmi_capacity *= dmi_data[17];
854 if (battery->design_capacity * battery->design_voltage / 1000
855 != dmi_capacity &&
856 battery->design_capacity * 10 == dmi_capacity)
857 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
858 &battery->flags);
859 }
860}
861
862/*
863 * According to the ACPI spec, some kinds of primary batteries can
864 * report percentage battery remaining capacity directly to OS.
865 * In this case, it reports the Last Full Charged Capacity == 100
866 * and BatteryPresentRate == 0xFFFFFFFF.
867 *
868 * Now we found some battery reports percentage remaining capacity
869 * even if it's rechargeable.
870 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
871 *
872 * Handle this correctly so that they won't break userspace.
873 */
874static void acpi_battery_quirks(struct acpi_battery *battery)
875{
876 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
877 return;
878
879 if (battery->full_charge_capacity == 100 &&
880 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
881 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
882 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
883 battery->full_charge_capacity = battery->design_capacity;
884 battery->capacity_now = (battery->capacity_now *
885 battery->full_charge_capacity) / 100;
886 }
887
888 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
889 return;
890
891 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
892 const char *s;
893 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
894 if (s && !strncasecmp(s, "ThinkPad", 8)) {
895 dmi_walk(find_battery, battery);
896 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
897 &battery->flags) &&
898 battery->design_voltage) {
899 battery->design_capacity =
900 battery->design_capacity *
901 10000 / battery->design_voltage;
902 battery->full_charge_capacity =
903 battery->full_charge_capacity *
904 10000 / battery->design_voltage;
905 battery->design_capacity_warning =
906 battery->design_capacity_warning *
907 10000 / battery->design_voltage;
908 battery->capacity_now = battery->capacity_now *
909 10000 / battery->design_voltage;
910 }
911 }
912 }
913
914 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
915 return;
916
917 if (acpi_battery_is_degraded(battery) &&
918 battery->capacity_now > battery->full_charge_capacity) {
919 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
920 battery->capacity_now = battery->full_charge_capacity;
921 }
922}
923
924static int acpi_battery_update(struct acpi_battery *battery, bool resume)
925{
926 int result = acpi_battery_get_status(battery);
927
928 if (result)
929 return result;
930
931 if (!acpi_battery_present(battery)) {
932 sysfs_remove_battery(battery);
933 battery->update_time = 0;
934 return 0;
935 }
936
937 if (resume)
938 return 0;
939
940 if (!battery->update_time) {
941 result = acpi_battery_get_info(battery);
942 if (result)
943 return result;
944 acpi_battery_init_alarm(battery);
945 }
946
947 result = acpi_battery_get_state(battery);
948 if (result)
949 return result;
950 acpi_battery_quirks(battery);
951
952 if (!battery->bat) {
953 result = sysfs_add_battery(battery);
954 if (result)
955 return result;
956 }
957
958 /*
959 * Wakeup the system if battery is critical low
960 * or lower than the alarm level
961 */
962 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
963 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
964 (battery->capacity_now <= battery->alarm)))
965 acpi_pm_wakeup_event(&battery->device->dev);
966
967 return result;
968}
969
970static void acpi_battery_refresh(struct acpi_battery *battery)
971{
972 int power_unit;
973
974 if (!battery->bat)
975 return;
976
977 power_unit = battery->power_unit;
978
979 acpi_battery_get_info(battery);
980
981 if (power_unit == battery->power_unit)
982 return;
983
984 /* The battery has changed its reporting units. */
985 sysfs_remove_battery(battery);
986 sysfs_add_battery(battery);
987}
988
989/* --------------------------------------------------------------------------
990 FS Interface (/proc)
991 -------------------------------------------------------------------------- */
992
993#ifdef CONFIG_ACPI_PROCFS_POWER
994static struct proc_dir_entry *acpi_battery_dir;
995
996static const char *acpi_battery_units(const struct acpi_battery *battery)
997{
998 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
999 "mA" : "mW";
1000}
1001
1002static int acpi_battery_info_proc_show(struct seq_file *seq, void *offset)
1003{
1004 struct acpi_battery *battery = seq->private;
1005 int result = acpi_battery_update(battery, false);
1006
1007 if (result)
1008 goto end;
1009
1010 seq_printf(seq, "present: %s\n",
1011 acpi_battery_present(battery) ? "yes" : "no");
1012 if (!acpi_battery_present(battery))
1013 goto end;
1014 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
1015 seq_printf(seq, "design capacity: unknown\n");
1016 else
1017 seq_printf(seq, "design capacity: %d %sh\n",
1018 battery->design_capacity,
1019 acpi_battery_units(battery));
1020
1021 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
1022 seq_printf(seq, "last full capacity: unknown\n");
1023 else
1024 seq_printf(seq, "last full capacity: %d %sh\n",
1025 battery->full_charge_capacity,
1026 acpi_battery_units(battery));
1027
1028 seq_printf(seq, "battery technology: %srechargeable\n",
1029 battery->technology ? "" : "non-");
1030
1031 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
1032 seq_printf(seq, "design voltage: unknown\n");
1033 else
1034 seq_printf(seq, "design voltage: %d mV\n",
1035 battery->design_voltage);
1036 seq_printf(seq, "design capacity warning: %d %sh\n",
1037 battery->design_capacity_warning,
1038 acpi_battery_units(battery));
1039 seq_printf(seq, "design capacity low: %d %sh\n",
1040 battery->design_capacity_low,
1041 acpi_battery_units(battery));
1042 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
1043 seq_printf(seq, "capacity granularity 1: %d %sh\n",
1044 battery->capacity_granularity_1,
1045 acpi_battery_units(battery));
1046 seq_printf(seq, "capacity granularity 2: %d %sh\n",
1047 battery->capacity_granularity_2,
1048 acpi_battery_units(battery));
1049 seq_printf(seq, "model number: %s\n", battery->model_number);
1050 seq_printf(seq, "serial number: %s\n", battery->serial_number);
1051 seq_printf(seq, "battery type: %s\n", battery->type);
1052 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
1053 end:
1054 if (result)
1055 seq_printf(seq, "ERROR: Unable to read battery info\n");
1056 return result;
1057}
1058
1059static int acpi_battery_state_proc_show(struct seq_file *seq, void *offset)
1060{
1061 struct acpi_battery *battery = seq->private;
1062 int result = acpi_battery_update(battery, false);
1063
1064 if (result)
1065 goto end;
1066
1067 seq_printf(seq, "present: %s\n",
1068 acpi_battery_present(battery) ? "yes" : "no");
1069 if (!acpi_battery_present(battery))
1070 goto end;
1071
1072 seq_printf(seq, "capacity state: %s\n",
1073 (battery->state & 0x04) ? "critical" : "ok");
1074 if ((battery->state & 0x01) && (battery->state & 0x02))
1075 seq_printf(seq,
1076 "charging state: charging/discharging\n");
1077 else if (battery->state & 0x01)
1078 seq_printf(seq, "charging state: discharging\n");
1079 else if (battery->state & 0x02)
1080 seq_printf(seq, "charging state: charging\n");
1081 else
1082 seq_printf(seq, "charging state: charged\n");
1083
1084 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
1085 seq_printf(seq, "present rate: unknown\n");
1086 else
1087 seq_printf(seq, "present rate: %d %s\n",
1088 battery->rate_now, acpi_battery_units(battery));
1089
1090 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
1091 seq_printf(seq, "remaining capacity: unknown\n");
1092 else
1093 seq_printf(seq, "remaining capacity: %d %sh\n",
1094 battery->capacity_now, acpi_battery_units(battery));
1095 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
1096 seq_printf(seq, "present voltage: unknown\n");
1097 else
1098 seq_printf(seq, "present voltage: %d mV\n",
1099 battery->voltage_now);
1100 end:
1101 if (result)
1102 seq_printf(seq, "ERROR: Unable to read battery state\n");
1103
1104 return result;
1105}
1106
1107static int acpi_battery_alarm_proc_show(struct seq_file *seq, void *offset)
1108{
1109 struct acpi_battery *battery = seq->private;
1110 int result = acpi_battery_update(battery, false);
1111
1112 if (result)
1113 goto end;
1114
1115 if (!acpi_battery_present(battery)) {
1116 seq_printf(seq, "present: no\n");
1117 goto end;
1118 }
1119 seq_printf(seq, "alarm: ");
1120 if (battery->alarm) {
1121 seq_printf(seq, "%u %sh\n", battery->alarm,
1122 acpi_battery_units(battery));
1123 } else {
1124 seq_printf(seq, "unsupported\n");
1125 }
1126 end:
1127 if (result)
1128 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
1129 return result;
1130}
1131
1132static ssize_t acpi_battery_write_alarm(struct file *file,
1133 const char __user * buffer,
1134 size_t count, loff_t * ppos)
1135{
1136 int result = 0;
1137 char alarm_string[12] = { '\0' };
1138 struct seq_file *m = file->private_data;
1139 struct acpi_battery *battery = m->private;
1140
1141 if (!battery || (count > sizeof(alarm_string) - 1))
1142 return -EINVAL;
1143 if (!acpi_battery_present(battery)) {
1144 result = -ENODEV;
1145 goto end;
1146 }
1147 if (copy_from_user(alarm_string, buffer, count)) {
1148 result = -EFAULT;
1149 goto end;
1150 }
1151 alarm_string[count] = '\0';
1152 if (kstrtoint(alarm_string, 0, &battery->alarm)) {
1153 result = -EINVAL;
1154 goto end;
1155 }
1156 result = acpi_battery_set_alarm(battery);
1157 end:
1158 if (result)
1159 return result;
1160 return count;
1161}
1162
1163static int acpi_battery_alarm_proc_open(struct inode *inode, struct file *file)
1164{
1165 return single_open(file, acpi_battery_alarm_proc_show, PDE_DATA(inode));
1166}
1167
1168static const struct file_operations acpi_battery_alarm_fops = {
1169 .owner = THIS_MODULE,
1170 .open = acpi_battery_alarm_proc_open,
1171 .read = seq_read,
1172 .write = acpi_battery_write_alarm,
1173 .llseek = seq_lseek,
1174 .release = single_release,
1175};
1176
1177static int acpi_battery_add_fs(struct acpi_device *device)
1178{
1179 pr_warning(PREFIX "Deprecated procfs I/F for battery is loaded, please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
1180 if (!acpi_device_dir(device)) {
1181 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
1182 acpi_battery_dir);
1183 if (!acpi_device_dir(device))
1184 return -ENODEV;
1185 }
1186
1187 if (!proc_create_single_data("info", S_IRUGO, acpi_device_dir(device),
1188 acpi_battery_info_proc_show, acpi_driver_data(device)))
1189 return -ENODEV;
1190 if (!proc_create_single_data("state", S_IRUGO, acpi_device_dir(device),
1191 acpi_battery_state_proc_show, acpi_driver_data(device)))
1192 return -ENODEV;
1193 if (!proc_create_data("alarm", S_IFREG | S_IRUGO | S_IWUSR,
1194 acpi_device_dir(device), &acpi_battery_alarm_fops,
1195 acpi_driver_data(device)))
1196 return -ENODEV;
1197 return 0;
1198}
1199
1200static void acpi_battery_remove_fs(struct acpi_device *device)
1201{
1202 if (!acpi_device_dir(device))
1203 return;
1204 remove_proc_subtree(acpi_device_bid(device), acpi_battery_dir);
1205 acpi_device_dir(device) = NULL;
1206}
1207
1208#endif
1209
1210/* --------------------------------------------------------------------------
1211 Driver Interface
1212 -------------------------------------------------------------------------- */
1213
1214static void acpi_battery_notify(struct acpi_device *device, u32 event)
1215{
1216 struct acpi_battery *battery = acpi_driver_data(device);
1217 struct power_supply *old;
1218
1219 if (!battery)
1220 return;
1221 old = battery->bat;
1222 /*
1223 * On Acer Aspire V5-573G notifications are sometimes triggered too
1224 * early. For example, when AC is unplugged and notification is
1225 * triggered, battery state is still reported as "Full", and changes to
1226 * "Discharging" only after short delay, without any notification.
1227 */
1228 if (battery_notification_delay_ms > 0)
1229 msleep(battery_notification_delay_ms);
1230 if (event == ACPI_BATTERY_NOTIFY_INFO)
1231 acpi_battery_refresh(battery);
1232 acpi_battery_update(battery, false);
1233 acpi_bus_generate_netlink_event(device->pnp.device_class,
1234 dev_name(&device->dev), event,
1235 acpi_battery_present(battery));
1236 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1237 /* acpi_battery_update could remove power_supply object */
1238 if (old && battery->bat)
1239 power_supply_changed(battery->bat);
1240}
1241
1242static int battery_notify(struct notifier_block *nb,
1243 unsigned long mode, void *_unused)
1244{
1245 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1246 pm_nb);
1247 int result;
1248
1249 switch (mode) {
1250 case PM_POST_HIBERNATION:
1251 case PM_POST_SUSPEND:
1252 if (!acpi_battery_present(battery))
1253 return 0;
1254
1255 if (battery->bat) {
1256 acpi_battery_refresh(battery);
1257 } else {
1258 result = acpi_battery_get_info(battery);
1259 if (result)
1260 return result;
1261
1262 result = sysfs_add_battery(battery);
1263 if (result)
1264 return result;
1265 }
1266
1267 acpi_battery_init_alarm(battery);
1268 acpi_battery_get_state(battery);
1269 break;
1270 }
1271
1272 return 0;
1273}
1274
1275static int __init
1276battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1277{
1278 battery_bix_broken_package = 1;
1279 return 0;
1280}
1281
1282static int __init
1283battery_notification_delay_quirk(const struct dmi_system_id *d)
1284{
1285 battery_notification_delay_ms = 1000;
1286 return 0;
1287}
1288
1289static int __init
1290battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1291{
1292 battery_ac_is_broken = 1;
1293 return 0;
1294}
1295
1296static int __init
1297battery_do_not_check_pmic_quirk(const struct dmi_system_id *d)
1298{
1299 battery_check_pmic = 0;
1300 return 0;
1301}
1302
1303static const struct dmi_system_id bat_dmi_table[] __initconst = {
1304 {
1305 /* NEC LZ750/LS */
1306 .callback = battery_bix_broken_package_quirk,
1307 .matches = {
1308 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1309 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1310 },
1311 },
1312 {
1313 /* Acer Aspire V5-573G */
1314 .callback = battery_notification_delay_quirk,
1315 .matches = {
1316 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1317 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1318 },
1319 },
1320 {
1321 /* Point of View mobii wintab p800w */
1322 .callback = battery_ac_is_broken_quirk,
1323 .matches = {
1324 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1325 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1326 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1327 /* Above matches are too generic, add bios-date match */
1328 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1329 },
1330 },
1331 {
1332 /* ECS EF20EA */
1333 .callback = battery_do_not_check_pmic_quirk,
1334 .matches = {
1335 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
1336 },
1337 },
1338 {
1339 /* Lenovo Ideapad Miix 320 */
1340 .callback = battery_do_not_check_pmic_quirk,
1341 .matches = {
1342 DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1343 DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "80XF"),
1344 DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
1345 },
1346 },
1347 {},
1348};
1349
1350/*
1351 * Some machines'(E,G Lenovo Z480) ECs are not stable
1352 * during boot up and this causes battery driver fails to be
1353 * probed due to failure of getting battery information
1354 * from EC sometimes. After several retries, the operation
1355 * may work. So add retry code here and 20ms sleep between
1356 * every retries.
1357 */
1358static int acpi_battery_update_retry(struct acpi_battery *battery)
1359{
1360 int retry, ret;
1361
1362 for (retry = 5; retry; retry--) {
1363 ret = acpi_battery_update(battery, false);
1364 if (!ret)
1365 break;
1366
1367 msleep(20);
1368 }
1369 return ret;
1370}
1371
1372static int acpi_battery_add(struct acpi_device *device)
1373{
1374 int result = 0;
1375 struct acpi_battery *battery = NULL;
1376
1377 if (!device)
1378 return -EINVAL;
1379
1380 if (device->dep_unmet)
1381 return -EPROBE_DEFER;
1382
1383 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1384 if (!battery)
1385 return -ENOMEM;
1386 battery->device = device;
1387 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1388 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1389 device->driver_data = battery;
1390 mutex_init(&battery->lock);
1391 mutex_init(&battery->sysfs_lock);
1392 if (acpi_has_method(battery->device->handle, "_BIX"))
1393 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1394
1395 result = acpi_battery_update_retry(battery);
1396 if (result)
1397 goto fail;
1398
1399#ifdef CONFIG_ACPI_PROCFS_POWER
1400 result = acpi_battery_add_fs(device);
1401 if (result) {
1402 acpi_battery_remove_fs(device);
1403 goto fail;
1404 }
1405#endif
1406
1407 pr_info(PREFIX "%s Slot [%s] (battery %s)\n",
1408 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1409 device->status.battery_present ? "present" : "absent");
1410
1411 battery->pm_nb.notifier_call = battery_notify;
1412 register_pm_notifier(&battery->pm_nb);
1413
1414 device_init_wakeup(&device->dev, 1);
1415
1416 return result;
1417
1418fail:
1419 sysfs_remove_battery(battery);
1420 mutex_destroy(&battery->lock);
1421 mutex_destroy(&battery->sysfs_lock);
1422 kfree(battery);
1423 return result;
1424}
1425
1426static int acpi_battery_remove(struct acpi_device *device)
1427{
1428 struct acpi_battery *battery = NULL;
1429
1430 if (!device || !acpi_driver_data(device))
1431 return -EINVAL;
1432 device_init_wakeup(&device->dev, 0);
1433 battery = acpi_driver_data(device);
1434 unregister_pm_notifier(&battery->pm_nb);
1435#ifdef CONFIG_ACPI_PROCFS_POWER
1436 acpi_battery_remove_fs(device);
1437#endif
1438 sysfs_remove_battery(battery);
1439 mutex_destroy(&battery->lock);
1440 mutex_destroy(&battery->sysfs_lock);
1441 kfree(battery);
1442 return 0;
1443}
1444
1445#ifdef CONFIG_PM_SLEEP
1446/* this is needed to learn about changes made in suspended state */
1447static int acpi_battery_resume(struct device *dev)
1448{
1449 struct acpi_battery *battery;
1450
1451 if (!dev)
1452 return -EINVAL;
1453
1454 battery = acpi_driver_data(to_acpi_device(dev));
1455 if (!battery)
1456 return -EINVAL;
1457
1458 battery->update_time = 0;
1459 acpi_battery_update(battery, true);
1460 return 0;
1461}
1462#else
1463#define acpi_battery_resume NULL
1464#endif
1465
1466static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1467
1468static struct acpi_driver acpi_battery_driver = {
1469 .name = "battery",
1470 .class = ACPI_BATTERY_CLASS,
1471 .ids = battery_device_ids,
1472 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1473 .ops = {
1474 .add = acpi_battery_add,
1475 .remove = acpi_battery_remove,
1476 .notify = acpi_battery_notify,
1477 },
1478 .drv.pm = &acpi_battery_pm,
1479};
1480
1481static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1482{
1483 unsigned int i;
1484 int result;
1485
1486 dmi_check_system(bat_dmi_table);
1487
1488 if (battery_check_pmic) {
1489 for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
1490 if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
1491 pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME
1492 ": found native %s PMIC, not loading\n",
1493 acpi_battery_blacklist[i]);
1494 return;
1495 }
1496 }
1497
1498#ifdef CONFIG_ACPI_PROCFS_POWER
1499 acpi_battery_dir = acpi_lock_battery_dir();
1500 if (!acpi_battery_dir)
1501 return;
1502#endif
1503 result = acpi_bus_register_driver(&acpi_battery_driver);
1504#ifdef CONFIG_ACPI_PROCFS_POWER
1505 if (result < 0)
1506 acpi_unlock_battery_dir(acpi_battery_dir);
1507#endif
1508 battery_driver_registered = (result == 0);
1509}
1510
1511static int __init acpi_battery_init(void)
1512{
1513 if (acpi_disabled)
1514 return -ENODEV;
1515
1516 async_cookie = async_schedule(acpi_battery_init_async, NULL);
1517 return 0;
1518}
1519
1520static void __exit acpi_battery_exit(void)
1521{
1522 async_synchronize_cookie(async_cookie + 1);
1523 if (battery_driver_registered) {
1524 acpi_bus_unregister_driver(&acpi_battery_driver);
1525 battery_hook_exit();
1526 }
1527#ifdef CONFIG_ACPI_PROCFS_POWER
1528 if (acpi_battery_dir)
1529 acpi_unlock_battery_dir(acpi_battery_dir);
1530#endif
1531}
1532
1533module_init(acpi_battery_init);
1534module_exit(acpi_battery_exit);
1/*
2 * battery.c - ACPI Battery Driver (Revision: 2.0)
3 *
4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
22 */
23
24#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
66ACPI_MODULE_NAME("battery");
67
68MODULE_AUTHOR("Paul Diefenbaugh");
69MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
70MODULE_DESCRIPTION("ACPI Battery Driver");
71MODULE_LICENSE("GPL");
72
73static async_cookie_t async_cookie;
74static bool battery_driver_registered;
75static int battery_bix_broken_package;
76static int battery_notification_delay_ms;
77static unsigned int cache_time = 1000;
78module_param(cache_time, uint, 0644);
79MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
80
81#ifdef CONFIG_ACPI_PROCFS_POWER
82extern struct proc_dir_entry *acpi_lock_battery_dir(void);
83extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
84
85enum acpi_battery_files {
86 info_tag = 0,
87 state_tag,
88 alarm_tag,
89 ACPI_BATTERY_NUMFILES,
90};
91
92#endif
93
94static const struct acpi_device_id battery_device_ids[] = {
95 {"PNP0C0A", 0},
96 {"", 0},
97};
98
99MODULE_DEVICE_TABLE(acpi, battery_device_ids);
100
101/* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
102static const char * const acpi_battery_blacklist[] = {
103 "INT33F4", /* X-Powers AXP288 PMIC */
104};
105
106enum {
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
128struct 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
167static inline int acpi_battery_present(struct acpi_battery *battery)
168{
169 return battery->device->status.battery_present;
170}
171
172static 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
187static int acpi_battery_get_state(struct acpi_battery *battery);
188
189static 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
212static 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
218static 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
323static 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
341static 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 -------------------------------------------------------------------------- */
362struct acpi_offsets {
363 size_t offset; /* offset inside struct acpi_sbs_battery */
364 u8 mode; /* int or string? */
365};
366
367static 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
374static 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
390static 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
413static 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
445static 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
455static 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
496static 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
535static 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
592static 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
612static 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
625static 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
633static 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
646static 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
661static LIST_HEAD(acpi_battery_list);
662static LIST_HEAD(battery_hook_list);
663static DEFINE_MUTEX(hook_mutex);
664
665static 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
683void battery_hook_unregister(struct acpi_battery_hook *hook)
684{
685 __battery_hook_unregister(hook, 1);
686}
687EXPORT_SYMBOL_GPL(battery_hook_unregister);
688
689void 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}
718EXPORT_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*/
725static 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
753static 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
770static 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
785static 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
816static 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
830static 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 */
860static 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
910static 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
956static 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
980static struct proc_dir_entry *acpi_battery_dir;
981
982static 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
988static 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
1044static 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
1091static 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
1114static 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
1145typedef int(*print_func)(struct seq_file *seq, int result);
1146
1147static 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
1153static 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) \
1161static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
1162{ \
1163 return acpi_battery_read(_name##_tag, seq); \
1164} \
1165static 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
1170DECLARE_FILE_FUNCTIONS(info);
1171DECLARE_FILE_FUNCTIONS(state);
1172DECLARE_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
1203static 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
1216static 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
1242static 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
1261static 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
1289static 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
1321static int __init
1322battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1323{
1324 battery_bix_broken_package = 1;
1325 return 0;
1326}
1327
1328static int __init
1329battery_notification_delay_quirk(const struct dmi_system_id *d)
1330{
1331 battery_notification_delay_ms = 1000;
1332 return 0;
1333}
1334
1335static 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 */
1363static 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
1377static 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
1423fail:
1424 sysfs_remove_battery(battery);
1425 mutex_destroy(&battery->lock);
1426 mutex_destroy(&battery->sysfs_lock);
1427 kfree(battery);
1428 return result;
1429}
1430
1431static 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 */
1452static 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
1471static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1472
1473static 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
1486static 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
1514static 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
1523static 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
1536module_init(acpi_battery_init);
1537module_exit(acpi_battery_exit);