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) "ACPI: battery: " fmt
12
13 #include <linux/delay.h>
14 #include <linux/dmi.h>
15 #include <linux/jiffies.h>
16 #include <linux/kernel.h>
17 #include <linux/list.h>
18 #include <linux/module.h>
19 #include <linux/mutex.h>
20 #include <linux/platform_device.h>
21 #include <linux/slab.h>
22 #include <linux/suspend.h>
23 #include <linux/types.h>
24
25 #include <linux/unaligned.h>
26
27 #include <linux/acpi.h>
28 #include <linux/power_supply.h>
29
30 #include <acpi/battery.h>
31
32 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
33 #define ACPI_BATTERY_CAPACITY_VALID(capacity) \
34 ((capacity) != 0 && (capacity) != ACPI_BATTERY_VALUE_UNKNOWN)
35
36 #define ACPI_BATTERY_DEVICE_NAME "Battery"
37
38 /* Battery power unit: 0 means mW, 1 means mA */
39 #define ACPI_BATTERY_POWER_UNIT_MA 1
40
41 #define ACPI_BATTERY_STATE_DISCHARGING 0x1
42 #define ACPI_BATTERY_STATE_CHARGING 0x2
43 #define ACPI_BATTERY_STATE_CRITICAL 0x4
44 #define ACPI_BATTERY_STATE_CHARGE_LIMITING 0x8
45
46 #define MAX_STRING_LENGTH 64
47
48 MODULE_AUTHOR("Paul Diefenbaugh");
49 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
50 MODULE_DESCRIPTION("ACPI Battery Driver");
51 MODULE_LICENSE("GPL");
52
53 static int battery_bix_broken_package;
54 static int battery_notification_delay_ms;
55 static int battery_ac_is_broken;
56 static unsigned int cache_time = 1000;
57 module_param(cache_time, uint, 0644);
58 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
59
60 static const struct acpi_device_id battery_device_ids[] = {
61 {"PNP0C0A", 0},
62
63 /* Microsoft Surface Go 3 */
64 {"MSHW0146", 0},
65
66 {"", 0},
67 };
68
69 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
70
71 enum {
72 ACPI_BATTERY_ALARM_PRESENT,
73 ACPI_BATTERY_XINFO_PRESENT,
74 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
75 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
76 * switches between mWh and mAh depending on whether the system
77 * is running on battery or not. When mAh is the unit, most
78 * reported values are incorrect and need to be adjusted by
79 * 10000/design_voltage. Verified on x201, t410, t410s, and x220.
80 * Pre-2010 and 2012 models appear to always report in mWh and
81 * are thus unaffected (tested with t42, t61, t500, x200, x300,
82 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for
83 * the 2011 models that fixes the issue (tested on x220 with a
84 * post-1.29 BIOS), but as of Nov. 2012, no such update is
85 * available for the 2010 models.
86 */
87 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
88 /* for batteries reporting current capacity with design capacity
89 * on a full charge, but showing degradation in full charge cap.
90 */
91 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
92 };
93
94 struct acpi_battery {
95 struct mutex update_lock;
96 struct power_supply *bat;
97 struct power_supply_desc bat_desc;
98 struct acpi_device *device;
99 struct notifier_block pm_nb;
100 struct list_head list;
101 unsigned long update_time;
102 int revision;
103 int rate_now;
104 int capacity_now;
105 int voltage_now;
106 int design_capacity;
107 int full_charge_capacity;
108 int technology;
109 int design_voltage;
110 int design_capacity_warning;
111 int design_capacity_low;
112 int cycle_count;
113 int measurement_accuracy;
114 int max_sampling_time;
115 int min_sampling_time;
116 int max_averaging_interval;
117 int min_averaging_interval;
118 int capacity_granularity_1;
119 int capacity_granularity_2;
120 int alarm;
121 char model_number[MAX_STRING_LENGTH];
122 char serial_number[MAX_STRING_LENGTH];
123 char type[MAX_STRING_LENGTH];
124 char oem_info[MAX_STRING_LENGTH];
125 int state;
126 int power_unit;
127 unsigned long flags;
128 };
129
130 #define to_acpi_battery(x) power_supply_get_drvdata(x)
131
acpi_battery_present(struct acpi_battery * battery)132 static inline int acpi_battery_present(struct acpi_battery *battery)
133 {
134 return battery->device->status.battery_present;
135 }
136
acpi_battery_technology(struct acpi_battery * battery)137 static int acpi_battery_technology(struct acpi_battery *battery)
138 {
139 if (!strcasecmp("NiCd", battery->type))
140 return POWER_SUPPLY_TECHNOLOGY_NiCd;
141 if (!strcasecmp("NiMH", battery->type))
142 return POWER_SUPPLY_TECHNOLOGY_NiMH;
143 if (!strcasecmp("LION", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_LION;
145 if (!strncasecmp("LI-ION", battery->type, 6))
146 return POWER_SUPPLY_TECHNOLOGY_LION;
147 if (!strcasecmp("LiP", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_LIPO;
149 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
150 }
151
152 static int acpi_battery_get_state(struct acpi_battery *battery);
153
acpi_battery_is_charged(struct acpi_battery * battery)154 static int acpi_battery_is_charged(struct acpi_battery *battery)
155 {
156 /* charging, discharging, critical low or charge limited */
157 if (battery->state != 0)
158 return 0;
159
160 /* battery not reporting charge */
161 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
162 battery->capacity_now == 0)
163 return 0;
164
165 /* good batteries update full_charge as the batteries degrade */
166 if (battery->full_charge_capacity == battery->capacity_now)
167 return 1;
168
169 /* fallback to using design values for broken batteries */
170 if (battery->design_capacity <= battery->capacity_now)
171 return 1;
172
173 /* we don't do any sort of metric based on percentages */
174 return 0;
175 }
176
acpi_battery_is_degraded(struct acpi_battery * battery)177 static bool acpi_battery_is_degraded(struct acpi_battery *battery)
178 {
179 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
180 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
181 battery->full_charge_capacity < battery->design_capacity;
182 }
183
acpi_battery_handle_discharging(struct acpi_battery * battery)184 static int acpi_battery_handle_discharging(struct acpi_battery *battery)
185 {
186 /*
187 * Some devices wrongly report discharging if the battery's charge level
188 * was above the device's start charging threshold atm the AC adapter
189 * was plugged in and the device thus did not start a new charge cycle.
190 */
191 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
192 battery->rate_now == 0)
193 return POWER_SUPPLY_STATUS_NOT_CHARGING;
194
195 return POWER_SUPPLY_STATUS_DISCHARGING;
196 }
197
acpi_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)198 static int acpi_battery_get_property(struct power_supply *psy,
199 enum power_supply_property psp,
200 union power_supply_propval *val)
201 {
202 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
203 struct acpi_battery *battery = to_acpi_battery(psy);
204
205 if (acpi_battery_present(battery)) {
206 /* run battery update only if it is present */
207 acpi_battery_get_state(battery);
208 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
209 return -ENODEV;
210 switch (psp) {
211 case POWER_SUPPLY_PROP_STATUS:
212 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
213 val->intval = acpi_battery_handle_discharging(battery);
214 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
215 /* Validate the status by checking the current. */
216 if (battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
217 battery->rate_now == 0) {
218 /* On charge but no current (0W/0mA). */
219 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
220 } else {
221 val->intval = POWER_SUPPLY_STATUS_CHARGING;
222 }
223 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING)
224 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
225 else if (acpi_battery_is_charged(battery))
226 val->intval = POWER_SUPPLY_STATUS_FULL;
227 else
228 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
229 break;
230 case POWER_SUPPLY_PROP_PRESENT:
231 val->intval = acpi_battery_present(battery);
232 break;
233 case POWER_SUPPLY_PROP_TECHNOLOGY:
234 val->intval = acpi_battery_technology(battery);
235 break;
236 case POWER_SUPPLY_PROP_CYCLE_COUNT:
237 val->intval = battery->cycle_count;
238 break;
239 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
240 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
241 ret = -ENODEV;
242 else
243 val->intval = battery->design_voltage * 1000;
244 break;
245 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
246 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
247 ret = -ENODEV;
248 else
249 val->intval = battery->voltage_now * 1000;
250 break;
251 case POWER_SUPPLY_PROP_CURRENT_NOW:
252 case POWER_SUPPLY_PROP_POWER_NOW:
253 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
254 ret = -ENODEV;
255 else
256 val->intval = battery->rate_now * 1000;
257 break;
258 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
259 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
260 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
261 ret = -ENODEV;
262 else
263 val->intval = battery->design_capacity * 1000;
264 break;
265 case POWER_SUPPLY_PROP_CHARGE_FULL:
266 case POWER_SUPPLY_PROP_ENERGY_FULL:
267 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
268 ret = -ENODEV;
269 else
270 val->intval = battery->full_charge_capacity * 1000;
271 break;
272 case POWER_SUPPLY_PROP_CHARGE_NOW:
273 case POWER_SUPPLY_PROP_ENERGY_NOW:
274 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
275 ret = -ENODEV;
276 else
277 val->intval = battery->capacity_now * 1000;
278 break;
279 case POWER_SUPPLY_PROP_CAPACITY:
280 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
281 full_capacity = battery->full_charge_capacity;
282 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
283 full_capacity = battery->design_capacity;
284
285 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
286 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
287 ret = -ENODEV;
288 else
289 val->intval = DIV_ROUND_CLOSEST_ULL(battery->capacity_now * 100ULL,
290 full_capacity);
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
318 static const 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
336 static const enum power_supply_property charge_battery_full_cap_broken_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_CURRENT_NOW,
344 POWER_SUPPLY_PROP_CHARGE_NOW,
345 POWER_SUPPLY_PROP_MODEL_NAME,
346 POWER_SUPPLY_PROP_MANUFACTURER,
347 POWER_SUPPLY_PROP_SERIAL_NUMBER,
348 };
349
350 static const enum power_supply_property energy_battery_props[] = {
351 POWER_SUPPLY_PROP_STATUS,
352 POWER_SUPPLY_PROP_PRESENT,
353 POWER_SUPPLY_PROP_TECHNOLOGY,
354 POWER_SUPPLY_PROP_CYCLE_COUNT,
355 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
356 POWER_SUPPLY_PROP_VOLTAGE_NOW,
357 POWER_SUPPLY_PROP_POWER_NOW,
358 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
359 POWER_SUPPLY_PROP_ENERGY_FULL,
360 POWER_SUPPLY_PROP_ENERGY_NOW,
361 POWER_SUPPLY_PROP_CAPACITY,
362 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
363 POWER_SUPPLY_PROP_MODEL_NAME,
364 POWER_SUPPLY_PROP_MANUFACTURER,
365 POWER_SUPPLY_PROP_SERIAL_NUMBER,
366 };
367
368 static const enum power_supply_property energy_battery_full_cap_broken_props[] = {
369 POWER_SUPPLY_PROP_STATUS,
370 POWER_SUPPLY_PROP_PRESENT,
371 POWER_SUPPLY_PROP_TECHNOLOGY,
372 POWER_SUPPLY_PROP_CYCLE_COUNT,
373 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
374 POWER_SUPPLY_PROP_VOLTAGE_NOW,
375 POWER_SUPPLY_PROP_POWER_NOW,
376 POWER_SUPPLY_PROP_ENERGY_NOW,
377 POWER_SUPPLY_PROP_MODEL_NAME,
378 POWER_SUPPLY_PROP_MANUFACTURER,
379 POWER_SUPPLY_PROP_SERIAL_NUMBER,
380 };
381
382 /* Battery Management */
383 struct acpi_offsets {
384 size_t offset; /* offset inside struct acpi_sbs_battery */
385 u8 mode; /* int or string? */
386 };
387
388 static const struct acpi_offsets state_offsets[] = {
389 {offsetof(struct acpi_battery, state), 0},
390 {offsetof(struct acpi_battery, rate_now), 0},
391 {offsetof(struct acpi_battery, capacity_now), 0},
392 {offsetof(struct acpi_battery, voltage_now), 0},
393 };
394
395 static const struct acpi_offsets info_offsets[] = {
396 {offsetof(struct acpi_battery, power_unit), 0},
397 {offsetof(struct acpi_battery, design_capacity), 0},
398 {offsetof(struct acpi_battery, full_charge_capacity), 0},
399 {offsetof(struct acpi_battery, technology), 0},
400 {offsetof(struct acpi_battery, design_voltage), 0},
401 {offsetof(struct acpi_battery, design_capacity_warning), 0},
402 {offsetof(struct acpi_battery, design_capacity_low), 0},
403 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
404 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
405 {offsetof(struct acpi_battery, model_number), 1},
406 {offsetof(struct acpi_battery, serial_number), 1},
407 {offsetof(struct acpi_battery, type), 1},
408 {offsetof(struct acpi_battery, oem_info), 1},
409 };
410
411 static const struct acpi_offsets extended_info_offsets[] = {
412 {offsetof(struct acpi_battery, revision), 0},
413 {offsetof(struct acpi_battery, power_unit), 0},
414 {offsetof(struct acpi_battery, design_capacity), 0},
415 {offsetof(struct acpi_battery, full_charge_capacity), 0},
416 {offsetof(struct acpi_battery, technology), 0},
417 {offsetof(struct acpi_battery, design_voltage), 0},
418 {offsetof(struct acpi_battery, design_capacity_warning), 0},
419 {offsetof(struct acpi_battery, design_capacity_low), 0},
420 {offsetof(struct acpi_battery, cycle_count), 0},
421 {offsetof(struct acpi_battery, measurement_accuracy), 0},
422 {offsetof(struct acpi_battery, max_sampling_time), 0},
423 {offsetof(struct acpi_battery, min_sampling_time), 0},
424 {offsetof(struct acpi_battery, max_averaging_interval), 0},
425 {offsetof(struct acpi_battery, min_averaging_interval), 0},
426 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
427 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
428 {offsetof(struct acpi_battery, model_number), 1},
429 {offsetof(struct acpi_battery, serial_number), 1},
430 {offsetof(struct acpi_battery, type), 1},
431 {offsetof(struct acpi_battery, oem_info), 1},
432 };
433
extract_package(struct acpi_battery * battery,union acpi_object * package,const struct acpi_offsets * offsets,int num)434 static int extract_package(struct acpi_battery *battery,
435 union acpi_object *package,
436 const struct acpi_offsets *offsets, int num)
437 {
438 int i;
439 union acpi_object *element;
440
441 if (package->type != ACPI_TYPE_PACKAGE)
442 return -EFAULT;
443 for (i = 0; i < num; ++i) {
444 if (package->package.count <= i)
445 return -EFAULT;
446 element = &package->package.elements[i];
447 if (offsets[i].mode) {
448 u8 *ptr = (u8 *)battery + offsets[i].offset;
449 u32 len = MAX_STRING_LENGTH;
450
451 switch (element->type) {
452 case ACPI_TYPE_BUFFER:
453 if (len > element->buffer.length + 1)
454 len = element->buffer.length + 1;
455
456 fallthrough;
457 case ACPI_TYPE_STRING:
458 strscpy(ptr, element->string.pointer, len);
459
460 break;
461 case ACPI_TYPE_INTEGER:
462 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1);
463
464 break;
465 default:
466 *ptr = 0; /* don't have value */
467 }
468 } else {
469 int *x = (int *)((u8 *)battery + offsets[i].offset);
470 *x = (element->type == ACPI_TYPE_INTEGER) ?
471 element->integer.value : -1;
472 }
473 }
474 return 0;
475 }
476
acpi_battery_get_status(struct acpi_battery * battery)477 static int acpi_battery_get_status(struct acpi_battery *battery)
478 {
479 if (acpi_bus_get_status(battery->device)) {
480 acpi_handle_info(battery->device->handle,
481 "_STA evaluation failed\n");
482 return -ENODEV;
483 }
484 return 0;
485 }
486
487
extract_battery_info(const int use_bix,struct acpi_battery * battery,const struct acpi_buffer * buffer)488 static int extract_battery_info(const int use_bix,
489 struct acpi_battery *battery,
490 const struct acpi_buffer *buffer)
491 {
492 int result = -EFAULT;
493
494 if (use_bix && battery_bix_broken_package)
495 result = extract_package(battery, buffer->pointer,
496 extended_info_offsets + 1,
497 ARRAY_SIZE(extended_info_offsets) - 1);
498 else if (use_bix)
499 result = extract_package(battery, buffer->pointer,
500 extended_info_offsets,
501 ARRAY_SIZE(extended_info_offsets));
502 else
503 result = extract_package(battery, buffer->pointer,
504 info_offsets, ARRAY_SIZE(info_offsets));
505 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
506 battery->full_charge_capacity = battery->design_capacity;
507 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
508 battery->power_unit && battery->design_voltage) {
509 battery->design_capacity = battery->design_capacity *
510 10000 / battery->design_voltage;
511 battery->full_charge_capacity = battery->full_charge_capacity *
512 10000 / battery->design_voltage;
513 battery->design_capacity_warning =
514 battery->design_capacity_warning *
515 10000 / battery->design_voltage;
516 /* Curiously, design_capacity_low, unlike the rest of them,
517 * is correct.
518 */
519 /* capacity_granularity_* equal 1 on the systems tested, so
520 * it's impossible to tell if they would need an adjustment
521 * or not if their values were higher.
522 */
523 }
524 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
525 battery->capacity_now > battery->full_charge_capacity)
526 battery->capacity_now = battery->full_charge_capacity;
527
528 return result;
529 }
530
acpi_battery_get_info(struct acpi_battery * battery)531 static int acpi_battery_get_info(struct acpi_battery *battery)
532 {
533 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
534 int use_bix;
535 int result = -ENODEV;
536
537 if (!acpi_battery_present(battery))
538 return 0;
539
540
541 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
542 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
543 acpi_status status = AE_ERROR;
544
545 status = acpi_evaluate_object(battery->device->handle,
546 use_bix ? "_BIX":"_BIF",
547 NULL, &buffer);
548
549 if (ACPI_FAILURE(status)) {
550 acpi_handle_info(battery->device->handle,
551 "%s evaluation failed: %s\n",
552 use_bix ? "_BIX":"_BIF",
553 acpi_format_exception(status));
554 } else {
555 result = extract_battery_info(use_bix,
556 battery,
557 &buffer);
558
559 kfree(buffer.pointer);
560 break;
561 }
562 }
563
564 if (!result && !use_bix && xinfo)
565 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
566
567 return result;
568 }
569
acpi_battery_get_state(struct acpi_battery * battery)570 static int acpi_battery_get_state(struct acpi_battery *battery)
571 {
572 int result = 0;
573 acpi_status status = 0;
574 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
575
576 if (!acpi_battery_present(battery))
577 return 0;
578
579 if (battery->update_time &&
580 time_before(jiffies, battery->update_time +
581 msecs_to_jiffies(cache_time)))
582 return 0;
583
584 status = acpi_evaluate_object(battery->device->handle, "_BST",
585 NULL, &buffer);
586 if (ACPI_FAILURE(status)) {
587 acpi_handle_info(battery->device->handle,
588 "_BST evaluation failed: %s",
589 acpi_format_exception(status));
590 return -ENODEV;
591 }
592
593 result = extract_package(battery, buffer.pointer,
594 state_offsets, ARRAY_SIZE(state_offsets));
595 battery->update_time = jiffies;
596 kfree(buffer.pointer);
597
598 /* For buggy DSDTs that report negative 16-bit values for either
599 * charging or discharging current and/or report 0 as 65536
600 * due to bad math.
601 */
602 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
603 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
604 (s16)(battery->rate_now) < 0) {
605 battery->rate_now = abs((s16)battery->rate_now);
606 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
607 }
608
609 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
610 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
611 battery->capacity_now = (battery->capacity_now *
612 battery->full_charge_capacity) / 100;
613 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
614 battery->power_unit && battery->design_voltage) {
615 battery->capacity_now = battery->capacity_now *
616 10000 / battery->design_voltage;
617 }
618 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
619 battery->capacity_now > battery->full_charge_capacity)
620 battery->capacity_now = battery->full_charge_capacity;
621
622 return result;
623 }
624
acpi_battery_set_alarm(struct acpi_battery * battery)625 static int acpi_battery_set_alarm(struct acpi_battery *battery)
626 {
627 acpi_status status = 0;
628
629 if (!acpi_battery_present(battery) ||
630 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
631 return -ENODEV;
632
633 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
634 battery->alarm);
635 if (ACPI_FAILURE(status))
636 return -ENODEV;
637
638 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
639 battery->alarm);
640
641 return 0;
642 }
643
acpi_battery_init_alarm(struct acpi_battery * battery)644 static int acpi_battery_init_alarm(struct acpi_battery *battery)
645 {
646 /* See if alarms are supported, and if so, set default */
647 if (!acpi_has_method(battery->device->handle, "_BTP")) {
648 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
649 return 0;
650 }
651 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
652 if (!battery->alarm)
653 battery->alarm = battery->design_capacity_warning;
654 return acpi_battery_set_alarm(battery);
655 }
656
acpi_battery_alarm_show(struct device * dev,struct device_attribute * attr,char * buf)657 static ssize_t acpi_battery_alarm_show(struct device *dev,
658 struct device_attribute *attr,
659 char *buf)
660 {
661 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
662
663 return sysfs_emit(buf, "%d\n", battery->alarm * 1000);
664 }
665
acpi_battery_alarm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)666 static ssize_t acpi_battery_alarm_store(struct device *dev,
667 struct device_attribute *attr,
668 const char *buf, size_t count)
669 {
670 unsigned long x;
671 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
672
673 if (sscanf(buf, "%lu\n", &x) == 1)
674 battery->alarm = x/1000;
675 if (acpi_battery_present(battery))
676 acpi_battery_set_alarm(battery);
677 return count;
678 }
679
680 static struct device_attribute alarm_attr = {
681 .attr = {.name = "alarm", .mode = 0644},
682 .show = acpi_battery_alarm_show,
683 .store = acpi_battery_alarm_store,
684 };
685
686 static struct attribute *acpi_battery_attrs[] = {
687 &alarm_attr.attr,
688 NULL
689 };
690 ATTRIBUTE_GROUPS(acpi_battery);
691
692 /*
693 * The Battery Hooking API
694 *
695 * This API is used inside other drivers that need to expose
696 * platform-specific behaviour within the generic driver in a
697 * generic way.
698 *
699 */
700
701 static LIST_HEAD(acpi_battery_list);
702 static LIST_HEAD(battery_hook_list);
703 static DEFINE_MUTEX(hook_mutex);
704
battery_hook_unregister_unlocked(struct acpi_battery_hook * hook)705 static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook)
706 {
707 struct acpi_battery *battery;
708
709 /*
710 * In order to remove a hook, we first need to
711 * de-register all the batteries that are registered.
712 */
713 list_for_each_entry(battery, &acpi_battery_list, list) {
714 if (!hook->remove_battery(battery->bat, hook))
715 power_supply_changed(battery->bat);
716 }
717 list_del_init(&hook->list);
718
719 pr_info("hook unregistered: %s\n", hook->name);
720 }
721
battery_hook_unregister(struct acpi_battery_hook * hook)722 void battery_hook_unregister(struct acpi_battery_hook *hook)
723 {
724 mutex_lock(&hook_mutex);
725 /*
726 * Ignore already unregistered battery hooks. This might happen
727 * if a battery hook was previously unloaded due to an error when
728 * adding a new battery.
729 */
730 if (!list_empty(&hook->list))
731 battery_hook_unregister_unlocked(hook);
732
733 mutex_unlock(&hook_mutex);
734 }
735 EXPORT_SYMBOL_GPL(battery_hook_unregister);
736
battery_hook_register(struct acpi_battery_hook * hook)737 void battery_hook_register(struct acpi_battery_hook *hook)
738 {
739 struct acpi_battery *battery;
740
741 mutex_lock(&hook_mutex);
742 list_add(&hook->list, &battery_hook_list);
743 /*
744 * Now that the driver is registered, we need
745 * to notify the hook that a battery is available
746 * for each battery, so that the driver may add
747 * its attributes.
748 */
749 list_for_each_entry(battery, &acpi_battery_list, list) {
750 if (hook->add_battery(battery->bat, hook)) {
751 /*
752 * If a add-battery returns non-zero,
753 * the registration of the hook has failed,
754 * and we will not add it to the list of loaded
755 * hooks.
756 */
757 pr_err("hook failed to load: %s", hook->name);
758 battery_hook_unregister_unlocked(hook);
759 goto end;
760 }
761
762 power_supply_changed(battery->bat);
763 }
764 pr_info("new hook: %s\n", hook->name);
765 end:
766 mutex_unlock(&hook_mutex);
767 }
768 EXPORT_SYMBOL_GPL(battery_hook_register);
769
devm_battery_hook_unregister(void * data)770 static void devm_battery_hook_unregister(void *data)
771 {
772 struct acpi_battery_hook *hook = data;
773
774 battery_hook_unregister(hook);
775 }
776
devm_battery_hook_register(struct device * dev,struct acpi_battery_hook * hook)777 int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook)
778 {
779 battery_hook_register(hook);
780
781 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook);
782 }
783 EXPORT_SYMBOL_GPL(devm_battery_hook_register);
784
785 /*
786 * This function gets called right after the battery sysfs
787 * attributes have been added, so that the drivers that
788 * define custom sysfs attributes can add their own.
789 */
battery_hook_add_battery(struct acpi_battery * battery)790 static void battery_hook_add_battery(struct acpi_battery *battery)
791 {
792 struct acpi_battery_hook *hook_node, *tmp;
793
794 mutex_lock(&hook_mutex);
795 INIT_LIST_HEAD(&battery->list);
796 list_add(&battery->list, &acpi_battery_list);
797 /*
798 * Since we added a new battery to the list, we need to
799 * iterate over the hooks and call add_battery for each
800 * hook that was registered. This usually happens
801 * when a battery gets hotplugged or initialized
802 * during the battery module initialization.
803 */
804 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
805 if (hook_node->add_battery(battery->bat, hook_node)) {
806 /*
807 * The notification of the hook has failed, to
808 * prevent further errors we will unload the hook.
809 */
810 pr_err("error in hook, unloading: %s",
811 hook_node->name);
812 battery_hook_unregister_unlocked(hook_node);
813 }
814 }
815 mutex_unlock(&hook_mutex);
816 }
817
battery_hook_remove_battery(struct acpi_battery * battery)818 static void battery_hook_remove_battery(struct acpi_battery *battery)
819 {
820 struct acpi_battery_hook *hook;
821
822 mutex_lock(&hook_mutex);
823 /*
824 * Before removing the hook, we need to remove all
825 * custom attributes from the battery.
826 */
827 list_for_each_entry(hook, &battery_hook_list, list) {
828 hook->remove_battery(battery->bat, hook);
829 }
830 /* Then, just remove the battery from the list */
831 list_del(&battery->list);
832 mutex_unlock(&hook_mutex);
833 }
834
battery_hook_exit(void)835 static void __exit battery_hook_exit(void)
836 {
837 struct acpi_battery_hook *hook;
838 struct acpi_battery_hook *ptr;
839 /*
840 * At this point, the acpi_bus_unregister_driver()
841 * has called remove for all batteries. We just
842 * need to remove the hooks.
843 */
844 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
845 battery_hook_unregister(hook);
846 }
847 mutex_destroy(&hook_mutex);
848 }
849
sysfs_add_battery(struct acpi_battery * battery)850 static int sysfs_add_battery(struct acpi_battery *battery)
851 {
852 struct power_supply_config psy_cfg = {
853 .drv_data = battery,
854 .attr_grp = acpi_battery_groups,
855 .no_wakeup_source = true,
856 };
857 bool full_cap_broken = false;
858
859 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
860 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
861 full_cap_broken = true;
862
863 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
864 if (full_cap_broken) {
865 battery->bat_desc.properties =
866 charge_battery_full_cap_broken_props;
867 battery->bat_desc.num_properties =
868 ARRAY_SIZE(charge_battery_full_cap_broken_props);
869 } else {
870 battery->bat_desc.properties = charge_battery_props;
871 battery->bat_desc.num_properties =
872 ARRAY_SIZE(charge_battery_props);
873 }
874 } else {
875 if (full_cap_broken) {
876 battery->bat_desc.properties =
877 energy_battery_full_cap_broken_props;
878 battery->bat_desc.num_properties =
879 ARRAY_SIZE(energy_battery_full_cap_broken_props);
880 } else {
881 battery->bat_desc.properties = energy_battery_props;
882 battery->bat_desc.num_properties =
883 ARRAY_SIZE(energy_battery_props);
884 }
885 }
886
887 battery->bat_desc.name = acpi_device_bid(battery->device);
888 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
889 battery->bat_desc.get_property = acpi_battery_get_property;
890
891 battery->bat = power_supply_register(&battery->device->dev,
892 &battery->bat_desc, &psy_cfg);
893
894 if (IS_ERR(battery->bat)) {
895 int result = PTR_ERR(battery->bat);
896
897 battery->bat = NULL;
898 return result;
899 }
900 battery_hook_add_battery(battery);
901 return 0;
902 }
903
sysfs_remove_battery(struct acpi_battery * battery)904 static void sysfs_remove_battery(struct acpi_battery *battery)
905 {
906 if (!battery->bat)
907 return;
908
909 battery_hook_remove_battery(battery);
910 power_supply_unregister(battery->bat);
911 battery->bat = NULL;
912 }
913
find_battery(const struct dmi_header * dm,void * private)914 static void find_battery(const struct dmi_header *dm, void *private)
915 {
916 struct acpi_battery *battery = (struct acpi_battery *)private;
917 /* Note: the hardcoded offsets below have been extracted from
918 * the source code of dmidecode.
919 */
920 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
921 const u8 *dmi_data = (const u8 *)(dm + 1);
922 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
923
924 if (dm->length >= 18)
925 dmi_capacity *= dmi_data[17];
926 if (battery->design_capacity * battery->design_voltage / 1000
927 != dmi_capacity &&
928 battery->design_capacity * 10 == dmi_capacity)
929 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
930 &battery->flags);
931 }
932 }
933
934 /*
935 * According to the ACPI spec, some kinds of primary batteries can
936 * report percentage battery remaining capacity directly to OS.
937 * In this case, it reports the Last Full Charged Capacity == 100
938 * and BatteryPresentRate == 0xFFFFFFFF.
939 *
940 * Now we found some battery reports percentage remaining capacity
941 * even if it's rechargeable.
942 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
943 *
944 * Handle this correctly so that they won't break userspace.
945 */
acpi_battery_quirks(struct acpi_battery * battery)946 static void acpi_battery_quirks(struct acpi_battery *battery)
947 {
948 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
949 return;
950
951 if (battery->full_charge_capacity == 100 &&
952 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
953 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
954 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
955 battery->full_charge_capacity = battery->design_capacity;
956 battery->capacity_now = (battery->capacity_now *
957 battery->full_charge_capacity) / 100;
958 }
959
960 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
961 return;
962
963 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
964 const char *s;
965
966 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
967 if (s && !strncasecmp(s, "ThinkPad", 8)) {
968 dmi_walk(find_battery, battery);
969 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
970 &battery->flags) &&
971 battery->design_voltage) {
972 battery->design_capacity =
973 battery->design_capacity *
974 10000 / battery->design_voltage;
975 battery->full_charge_capacity =
976 battery->full_charge_capacity *
977 10000 / battery->design_voltage;
978 battery->design_capacity_warning =
979 battery->design_capacity_warning *
980 10000 / battery->design_voltage;
981 battery->capacity_now = battery->capacity_now *
982 10000 / battery->design_voltage;
983 }
984 }
985 }
986
987 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
988 return;
989
990 if (acpi_battery_is_degraded(battery) &&
991 battery->capacity_now > battery->full_charge_capacity) {
992 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
993 battery->capacity_now = battery->full_charge_capacity;
994 }
995 }
996
acpi_battery_update(struct acpi_battery * battery,bool resume)997 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
998 {
999 int result = acpi_battery_get_status(battery);
1000
1001 if (result)
1002 return result;
1003
1004 if (!acpi_battery_present(battery)) {
1005 sysfs_remove_battery(battery);
1006 battery->update_time = 0;
1007 return 0;
1008 }
1009
1010 if (resume)
1011 return 0;
1012
1013 if (!battery->update_time) {
1014 result = acpi_battery_get_info(battery);
1015 if (result)
1016 return result;
1017 acpi_battery_init_alarm(battery);
1018 }
1019
1020 result = acpi_battery_get_state(battery);
1021 if (result)
1022 return result;
1023 acpi_battery_quirks(battery);
1024
1025 if (!battery->bat) {
1026 result = sysfs_add_battery(battery);
1027 if (result)
1028 return result;
1029 }
1030
1031 /*
1032 * Wakeup the system if battery is critical low
1033 * or lower than the alarm level
1034 */
1035 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
1036 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1037 (battery->capacity_now <= battery->alarm)))
1038 acpi_pm_wakeup_event(&battery->device->dev);
1039
1040 return result;
1041 }
1042
acpi_battery_refresh(struct acpi_battery * battery)1043 static void acpi_battery_refresh(struct acpi_battery *battery)
1044 {
1045 int power_unit;
1046
1047 if (!battery->bat)
1048 return;
1049
1050 power_unit = battery->power_unit;
1051
1052 acpi_battery_get_info(battery);
1053
1054 if (power_unit == battery->power_unit)
1055 return;
1056
1057 /* The battery has changed its reporting units. */
1058 sysfs_remove_battery(battery);
1059 sysfs_add_battery(battery);
1060 }
1061
1062 /* Driver Interface */
acpi_battery_notify(acpi_handle handle,u32 event,void * data)1063 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
1064 {
1065 struct acpi_battery *battery = data;
1066 struct acpi_device *device = battery->device;
1067 struct power_supply *old;
1068
1069 guard(mutex)(&battery->update_lock);
1070
1071 old = battery->bat;
1072 /*
1073 * On Acer Aspire V5-573G notifications are sometimes triggered too
1074 * early. For example, when AC is unplugged and notification is
1075 * triggered, battery state is still reported as "Full", and changes to
1076 * "Discharging" only after short delay, without any notification.
1077 */
1078 if (battery_notification_delay_ms > 0)
1079 msleep(battery_notification_delay_ms);
1080 if (event == ACPI_BATTERY_NOTIFY_INFO)
1081 acpi_battery_refresh(battery);
1082 acpi_battery_update(battery, false);
1083 acpi_bus_generate_netlink_event(device->pnp.device_class,
1084 dev_name(&device->dev), event,
1085 acpi_battery_present(battery));
1086 acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1087 /* acpi_battery_update could remove power_supply object */
1088 if (old && battery->bat)
1089 power_supply_changed(battery->bat);
1090 }
1091
battery_notify(struct notifier_block * nb,unsigned long mode,void * _unused)1092 static int battery_notify(struct notifier_block *nb,
1093 unsigned long mode, void *_unused)
1094 {
1095 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1096 pm_nb);
1097
1098 if (mode == PM_POST_SUSPEND || mode == PM_POST_HIBERNATION) {
1099 guard(mutex)(&battery->update_lock);
1100
1101 if (!acpi_battery_present(battery))
1102 return 0;
1103
1104 if (battery->bat) {
1105 acpi_battery_refresh(battery);
1106 } else {
1107 int result;
1108
1109 result = acpi_battery_get_info(battery);
1110 if (result)
1111 return result;
1112
1113 result = sysfs_add_battery(battery);
1114 if (result)
1115 return result;
1116 }
1117
1118 acpi_battery_init_alarm(battery);
1119 acpi_battery_get_state(battery);
1120 }
1121
1122 return 0;
1123 }
1124
1125 static int __init
battery_bix_broken_package_quirk(const struct dmi_system_id * d)1126 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1127 {
1128 battery_bix_broken_package = 1;
1129 return 0;
1130 }
1131
1132 static int __init
battery_notification_delay_quirk(const struct dmi_system_id * d)1133 battery_notification_delay_quirk(const struct dmi_system_id *d)
1134 {
1135 battery_notification_delay_ms = 1000;
1136 return 0;
1137 }
1138
1139 static int __init
battery_ac_is_broken_quirk(const struct dmi_system_id * d)1140 battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1141 {
1142 battery_ac_is_broken = 1;
1143 return 0;
1144 }
1145
1146 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1147 {
1148 /* NEC LZ750/LS */
1149 .callback = battery_bix_broken_package_quirk,
1150 .matches = {
1151 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1152 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1153 },
1154 },
1155 {
1156 /* Acer Aspire V5-573G */
1157 .callback = battery_notification_delay_quirk,
1158 .matches = {
1159 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1160 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1161 },
1162 },
1163 {
1164 /* Point of View mobii wintab p800w */
1165 .callback = battery_ac_is_broken_quirk,
1166 .matches = {
1167 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1168 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1169 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1170 /* Above matches are too generic, add bios-date match */
1171 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1172 },
1173 },
1174 {
1175 /* Microsoft Surface Go 3 */
1176 .callback = battery_notification_delay_quirk,
1177 .matches = {
1178 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1179 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1180 },
1181 },
1182 {},
1183 };
1184
1185 /*
1186 * Some machines'(E,G Lenovo Z480) ECs are not stable
1187 * during boot up and this causes battery driver fails to be
1188 * probed due to failure of getting battery information
1189 * from EC sometimes. After several retries, the operation
1190 * may work. So add retry code here and 20ms sleep between
1191 * every retries.
1192 */
acpi_battery_update_retry(struct acpi_battery * battery)1193 static int acpi_battery_update_retry(struct acpi_battery *battery)
1194 {
1195 int retry, ret;
1196
1197 guard(mutex)(&battery->update_lock);
1198
1199 for (retry = 5; retry; retry--) {
1200 ret = acpi_battery_update(battery, false);
1201 if (!ret)
1202 break;
1203
1204 msleep(20);
1205 }
1206 return ret;
1207 }
1208
sysfs_battery_cleanup(struct acpi_battery * battery)1209 static void sysfs_battery_cleanup(struct acpi_battery *battery)
1210 {
1211 guard(mutex)(&battery->update_lock);
1212
1213 sysfs_remove_battery(battery);
1214 }
1215
acpi_battery_probe(struct platform_device * pdev)1216 static int acpi_battery_probe(struct platform_device *pdev)
1217 {
1218 struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
1219 struct acpi_battery *battery;
1220 int result;
1221
1222 if (device->dep_unmet)
1223 return -EPROBE_DEFER;
1224
1225 battery = devm_kzalloc(&pdev->dev, sizeof(*battery), GFP_KERNEL);
1226 if (!battery)
1227 return -ENOMEM;
1228
1229 platform_set_drvdata(pdev, battery);
1230
1231 battery->device = device;
1232 strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1233 strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1234
1235 result = devm_mutex_init(&pdev->dev, &battery->update_lock);
1236 if (result)
1237 return result;
1238
1239 if (acpi_has_method(battery->device->handle, "_BIX"))
1240 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1241
1242 result = acpi_battery_update_retry(battery);
1243 if (result)
1244 goto fail;
1245
1246 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1247 device->status.battery_present ? "present" : "absent");
1248
1249 battery->pm_nb.notifier_call = battery_notify;
1250 result = register_pm_notifier(&battery->pm_nb);
1251 if (result)
1252 goto fail;
1253
1254 device_init_wakeup(&pdev->dev, true);
1255
1256 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
1257 acpi_battery_notify, battery);
1258 if (result)
1259 goto fail_pm;
1260
1261 return 0;
1262
1263 fail_pm:
1264 device_init_wakeup(&pdev->dev, false);
1265 unregister_pm_notifier(&battery->pm_nb);
1266 fail:
1267 sysfs_battery_cleanup(battery);
1268
1269 return result;
1270 }
1271
acpi_battery_remove(struct platform_device * pdev)1272 static void acpi_battery_remove(struct platform_device *pdev)
1273 {
1274 struct acpi_battery *battery = platform_get_drvdata(pdev);
1275
1276 acpi_dev_remove_notify_handler(battery->device, ACPI_ALL_NOTIFY,
1277 acpi_battery_notify);
1278
1279 device_init_wakeup(&pdev->dev, false);
1280 unregister_pm_notifier(&battery->pm_nb);
1281
1282 sysfs_battery_cleanup(battery);
1283 }
1284
1285 /* this is needed to learn about changes made in suspended state */
acpi_battery_resume(struct device * dev)1286 static int acpi_battery_resume(struct device *dev)
1287 {
1288 struct acpi_battery *battery = dev_get_drvdata(dev);
1289
1290 if (!battery)
1291 return -EINVAL;
1292
1293 battery->update_time = 0;
1294
1295 guard(mutex)(&battery->update_lock);
1296
1297 acpi_battery_update(battery, true);
1298 return 0;
1299 }
1300
1301 static DEFINE_SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1302
1303 static struct platform_driver acpi_battery_driver = {
1304 .probe = acpi_battery_probe,
1305 .remove = acpi_battery_remove,
1306 .driver = {
1307 .name = "acpi-battery",
1308 .acpi_match_table = battery_device_ids,
1309 .pm = pm_sleep_ptr(&acpi_battery_pm),
1310 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1311 },
1312 };
1313
acpi_battery_init(void)1314 static int __init acpi_battery_init(void)
1315 {
1316 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery())
1317 return -ENODEV;
1318
1319 dmi_check_system(bat_dmi_table);
1320
1321 return platform_driver_register(&acpi_battery_driver);
1322 }
1323
acpi_battery_exit(void)1324 static void __exit acpi_battery_exit(void)
1325 {
1326 platform_driver_unregister(&acpi_battery_driver);
1327 battery_hook_exit();
1328 }
1329
1330 module_init(acpi_battery_init);
1331 module_exit(acpi_battery_exit);
1332