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 /* Battery power unit: 0 means mW, 1 means mA */
37 #define ACPI_BATTERY_POWER_UNIT_MA 1
38
39 #define ACPI_BATTERY_STATE_DISCHARGING 0x1
40 #define ACPI_BATTERY_STATE_CHARGING 0x2
41 #define ACPI_BATTERY_STATE_CRITICAL 0x4
42 #define ACPI_BATTERY_STATE_CHARGE_LIMITING 0x8
43
44 #define MAX_STRING_LENGTH 64
45
46 MODULE_AUTHOR("Paul Diefenbaugh");
47 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
48 MODULE_DESCRIPTION("ACPI Battery Driver");
49 MODULE_LICENSE("GPL");
50
51 static int battery_bix_broken_package;
52 static int battery_notification_delay_ms;
53 static int battery_ac_is_broken;
54 static unsigned int cache_time = 1000;
55 module_param(cache_time, uint, 0644);
56 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
57
58 static const struct acpi_device_id battery_device_ids[] = {
59 {"PNP0C0A", 0},
60
61 /* Microsoft Surface Go 3 */
62 {"MSHW0146", 0},
63
64 {"", 0},
65 };
66
67 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
68
69 enum {
70 ACPI_BATTERY_ALARM_PRESENT,
71 ACPI_BATTERY_XINFO_PRESENT,
72 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
73 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit
74 * switches between mWh and mAh depending on whether the system
75 * is running on battery or not. When mAh is the unit, most
76 * reported values are incorrect and need to be adjusted by
77 * 10000/design_voltage. Verified on x201, t410, t410s, and x220.
78 * Pre-2010 and 2012 models appear to always report in mWh and
79 * are thus unaffected (tested with t42, t61, t500, x200, x300,
80 * and x230). Also, in mid-2012 Lenovo issued a BIOS update for
81 * the 2011 models that fixes the issue (tested on x220 with a
82 * post-1.29 BIOS), but as of Nov. 2012, no such update is
83 * available for the 2010 models.
84 */
85 ACPI_BATTERY_QUIRK_THINKPAD_MAH,
86 /* for batteries reporting current capacity with design capacity
87 * on a full charge, but showing degradation in full charge cap.
88 */
89 ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
90 };
91
92 struct acpi_battery {
93 struct mutex update_lock;
94 struct power_supply *bat;
95 struct power_supply_desc bat_desc;
96 struct acpi_device *device;
97 struct device *phys_dev;
98 struct notifier_block pm_nb;
99 struct list_head list;
100 unsigned long update_time;
101 int revision;
102 int rate_now;
103 int capacity_now;
104 int voltage_now;
105 int design_capacity;
106 int full_charge_capacity;
107 int technology;
108 int design_voltage;
109 int design_capacity_warning;
110 int design_capacity_low;
111 int cycle_count;
112 int measurement_accuracy;
113 int max_sampling_time;
114 int min_sampling_time;
115 int max_averaging_interval;
116 int min_averaging_interval;
117 int capacity_granularity_1;
118 int capacity_granularity_2;
119 int alarm;
120 char model_number[MAX_STRING_LENGTH];
121 char serial_number[MAX_STRING_LENGTH];
122 char type[MAX_STRING_LENGTH];
123 char oem_info[MAX_STRING_LENGTH];
124 int state;
125 int power_unit;
126 unsigned long flags;
127 };
128
129 #define to_acpi_battery(x) power_supply_get_drvdata(x)
130
acpi_battery_present(struct acpi_battery * battery)131 static inline int acpi_battery_present(struct acpi_battery *battery)
132 {
133 return battery->device->status.battery_present;
134 }
135
acpi_battery_technology(struct acpi_battery * battery)136 static int acpi_battery_technology(struct acpi_battery *battery)
137 {
138 if (!strcasecmp("NiCd", battery->type))
139 return POWER_SUPPLY_TECHNOLOGY_NiCd;
140 if (!strcasecmp("NiMH", battery->type))
141 return POWER_SUPPLY_TECHNOLOGY_NiMH;
142 if (!strcasecmp("LION", battery->type))
143 return POWER_SUPPLY_TECHNOLOGY_LION;
144 if (!strncasecmp("LI-ION", battery->type, 6))
145 return POWER_SUPPLY_TECHNOLOGY_LION;
146 if (!strcasecmp("LiP", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_LIPO;
148 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
149 }
150
151 static int acpi_battery_get_state(struct acpi_battery *battery);
152
acpi_battery_is_charged(struct acpi_battery * battery)153 static int acpi_battery_is_charged(struct acpi_battery *battery)
154 {
155 /* charging, discharging, critical low or charge limited */
156 if (battery->state != 0)
157 return 0;
158
159 /* battery not reporting charge */
160 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
161 battery->capacity_now == 0)
162 return 0;
163
164 /* good batteries update full_charge as the batteries degrade */
165 if (battery->full_charge_capacity == battery->capacity_now)
166 return 1;
167
168 /* fallback to using design values for broken batteries */
169 if (battery->design_capacity <= battery->capacity_now)
170 return 1;
171
172 /* we don't do any sort of metric based on percentages */
173 return 0;
174 }
175
acpi_battery_is_degraded(struct acpi_battery * battery)176 static bool acpi_battery_is_degraded(struct acpi_battery *battery)
177 {
178 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
179 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
180 battery->full_charge_capacity < battery->design_capacity;
181 }
182
acpi_battery_handle_discharging(struct acpi_battery * battery)183 static int acpi_battery_handle_discharging(struct acpi_battery *battery)
184 {
185 /*
186 * Some devices wrongly report discharging if the battery's charge level
187 * was above the device's start charging threshold atm the AC adapter
188 * was plugged in and the device thus did not start a new charge cycle.
189 */
190 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
191 battery->rate_now == 0)
192 return POWER_SUPPLY_STATUS_NOT_CHARGING;
193
194 return POWER_SUPPLY_STATUS_DISCHARGING;
195 }
196
acpi_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)197 static int acpi_battery_get_property(struct power_supply *psy,
198 enum power_supply_property psp,
199 union power_supply_propval *val)
200 {
201 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
202 struct acpi_battery *battery = to_acpi_battery(psy);
203
204 if (acpi_battery_present(battery)) {
205 /* run battery update only if it is present */
206 acpi_battery_get_state(battery);
207 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
208 return -ENODEV;
209 switch (psp) {
210 case POWER_SUPPLY_PROP_STATUS:
211 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
212 val->intval = acpi_battery_handle_discharging(battery);
213 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
214 /* Validate the status by checking the current. */
215 if (battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
216 battery->rate_now == 0) {
217 /* On charge but no current (0W/0mA). */
218 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
219 } else {
220 val->intval = POWER_SUPPLY_STATUS_CHARGING;
221 }
222 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING)
223 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
224 else if (acpi_battery_is_charged(battery))
225 val->intval = POWER_SUPPLY_STATUS_FULL;
226 else
227 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
228 break;
229 case POWER_SUPPLY_PROP_PRESENT:
230 val->intval = acpi_battery_present(battery);
231 break;
232 case POWER_SUPPLY_PROP_TECHNOLOGY:
233 val->intval = acpi_battery_technology(battery);
234 break;
235 case POWER_SUPPLY_PROP_CYCLE_COUNT:
236 val->intval = battery->cycle_count;
237 break;
238 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
239 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
240 ret = -ENODEV;
241 else
242 val->intval = battery->design_voltage * 1000;
243 break;
244 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
245 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
246 ret = -ENODEV;
247 else
248 val->intval = battery->voltage_now * 1000;
249 break;
250 case POWER_SUPPLY_PROP_CURRENT_NOW:
251 case POWER_SUPPLY_PROP_POWER_NOW:
252 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
253 ret = -ENODEV;
254 else
255 val->intval = battery->rate_now * 1000;
256 break;
257 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
258 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
259 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
260 ret = -ENODEV;
261 else
262 val->intval = battery->design_capacity * 1000;
263 break;
264 case POWER_SUPPLY_PROP_CHARGE_FULL:
265 case POWER_SUPPLY_PROP_ENERGY_FULL:
266 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
267 ret = -ENODEV;
268 else
269 val->intval = battery->full_charge_capacity * 1000;
270 break;
271 case POWER_SUPPLY_PROP_CHARGE_NOW:
272 case POWER_SUPPLY_PROP_ENERGY_NOW:
273 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
274 ret = -ENODEV;
275 else
276 val->intval = battery->capacity_now * 1000;
277 break;
278 case POWER_SUPPLY_PROP_CAPACITY:
279 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
280 full_capacity = battery->full_charge_capacity;
281 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
282 full_capacity = battery->design_capacity;
283
284 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
285 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
286 ret = -ENODEV;
287 else
288 val->intval = DIV_ROUND_CLOSEST_ULL(battery->capacity_now * 100ULL,
289 full_capacity);
290 break;
291 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
292 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
293 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
294 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
295 (battery->capacity_now <= battery->alarm))
296 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
297 else if (acpi_battery_is_charged(battery))
298 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
299 else
300 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
301 break;
302 case POWER_SUPPLY_PROP_MODEL_NAME:
303 val->strval = battery->model_number;
304 break;
305 case POWER_SUPPLY_PROP_MANUFACTURER:
306 val->strval = battery->oem_info;
307 break;
308 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
309 val->strval = battery->serial_number;
310 break;
311 default:
312 ret = -EINVAL;
313 }
314 return ret;
315 }
316
317 static const enum power_supply_property charge_battery_props[] = {
318 POWER_SUPPLY_PROP_STATUS,
319 POWER_SUPPLY_PROP_PRESENT,
320 POWER_SUPPLY_PROP_TECHNOLOGY,
321 POWER_SUPPLY_PROP_CYCLE_COUNT,
322 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
323 POWER_SUPPLY_PROP_VOLTAGE_NOW,
324 POWER_SUPPLY_PROP_CURRENT_NOW,
325 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
326 POWER_SUPPLY_PROP_CHARGE_FULL,
327 POWER_SUPPLY_PROP_CHARGE_NOW,
328 POWER_SUPPLY_PROP_CAPACITY,
329 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
330 POWER_SUPPLY_PROP_MODEL_NAME,
331 POWER_SUPPLY_PROP_MANUFACTURER,
332 POWER_SUPPLY_PROP_SERIAL_NUMBER,
333 };
334
335 static const enum power_supply_property charge_battery_full_cap_broken_props[] = {
336 POWER_SUPPLY_PROP_STATUS,
337 POWER_SUPPLY_PROP_PRESENT,
338 POWER_SUPPLY_PROP_TECHNOLOGY,
339 POWER_SUPPLY_PROP_CYCLE_COUNT,
340 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
341 POWER_SUPPLY_PROP_VOLTAGE_NOW,
342 POWER_SUPPLY_PROP_CURRENT_NOW,
343 POWER_SUPPLY_PROP_CHARGE_NOW,
344 POWER_SUPPLY_PROP_MODEL_NAME,
345 POWER_SUPPLY_PROP_MANUFACTURER,
346 POWER_SUPPLY_PROP_SERIAL_NUMBER,
347 };
348
349 static const enum power_supply_property energy_battery_props[] = {
350 POWER_SUPPLY_PROP_STATUS,
351 POWER_SUPPLY_PROP_PRESENT,
352 POWER_SUPPLY_PROP_TECHNOLOGY,
353 POWER_SUPPLY_PROP_CYCLE_COUNT,
354 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
355 POWER_SUPPLY_PROP_VOLTAGE_NOW,
356 POWER_SUPPLY_PROP_POWER_NOW,
357 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
358 POWER_SUPPLY_PROP_ENERGY_FULL,
359 POWER_SUPPLY_PROP_ENERGY_NOW,
360 POWER_SUPPLY_PROP_CAPACITY,
361 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
362 POWER_SUPPLY_PROP_MODEL_NAME,
363 POWER_SUPPLY_PROP_MANUFACTURER,
364 POWER_SUPPLY_PROP_SERIAL_NUMBER,
365 };
366
367 static const enum power_supply_property energy_battery_full_cap_broken_props[] = {
368 POWER_SUPPLY_PROP_STATUS,
369 POWER_SUPPLY_PROP_PRESENT,
370 POWER_SUPPLY_PROP_TECHNOLOGY,
371 POWER_SUPPLY_PROP_CYCLE_COUNT,
372 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
373 POWER_SUPPLY_PROP_VOLTAGE_NOW,
374 POWER_SUPPLY_PROP_POWER_NOW,
375 POWER_SUPPLY_PROP_ENERGY_NOW,
376 POWER_SUPPLY_PROP_MODEL_NAME,
377 POWER_SUPPLY_PROP_MANUFACTURER,
378 POWER_SUPPLY_PROP_SERIAL_NUMBER,
379 };
380
381 /* Battery Management */
382 struct acpi_offsets {
383 size_t offset; /* offset inside struct acpi_sbs_battery */
384 u8 mode; /* int or string? */
385 };
386
387 static const struct acpi_offsets state_offsets[] = {
388 {offsetof(struct acpi_battery, state), 0},
389 {offsetof(struct acpi_battery, rate_now), 0},
390 {offsetof(struct acpi_battery, capacity_now), 0},
391 {offsetof(struct acpi_battery, voltage_now), 0},
392 };
393
394 static const struct acpi_offsets info_offsets[] = {
395 {offsetof(struct acpi_battery, power_unit), 0},
396 {offsetof(struct acpi_battery, design_capacity), 0},
397 {offsetof(struct acpi_battery, full_charge_capacity), 0},
398 {offsetof(struct acpi_battery, technology), 0},
399 {offsetof(struct acpi_battery, design_voltage), 0},
400 {offsetof(struct acpi_battery, design_capacity_warning), 0},
401 {offsetof(struct acpi_battery, design_capacity_low), 0},
402 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
403 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
404 {offsetof(struct acpi_battery, model_number), 1},
405 {offsetof(struct acpi_battery, serial_number), 1},
406 {offsetof(struct acpi_battery, type), 1},
407 {offsetof(struct acpi_battery, oem_info), 1},
408 };
409
410 static const struct acpi_offsets extended_info_offsets[] = {
411 {offsetof(struct acpi_battery, revision), 0},
412 {offsetof(struct acpi_battery, power_unit), 0},
413 {offsetof(struct acpi_battery, design_capacity), 0},
414 {offsetof(struct acpi_battery, full_charge_capacity), 0},
415 {offsetof(struct acpi_battery, technology), 0},
416 {offsetof(struct acpi_battery, design_voltage), 0},
417 {offsetof(struct acpi_battery, design_capacity_warning), 0},
418 {offsetof(struct acpi_battery, design_capacity_low), 0},
419 {offsetof(struct acpi_battery, cycle_count), 0},
420 {offsetof(struct acpi_battery, measurement_accuracy), 0},
421 {offsetof(struct acpi_battery, max_sampling_time), 0},
422 {offsetof(struct acpi_battery, min_sampling_time), 0},
423 {offsetof(struct acpi_battery, max_averaging_interval), 0},
424 {offsetof(struct acpi_battery, min_averaging_interval), 0},
425 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
426 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
427 {offsetof(struct acpi_battery, model_number), 1},
428 {offsetof(struct acpi_battery, serial_number), 1},
429 {offsetof(struct acpi_battery, type), 1},
430 {offsetof(struct acpi_battery, oem_info), 1},
431 };
432
extract_package(struct acpi_battery * battery,union acpi_object * package,const struct acpi_offsets * offsets,int num)433 static int extract_package(struct acpi_battery *battery,
434 union acpi_object *package,
435 const struct acpi_offsets *offsets, int num)
436 {
437 int i;
438 union acpi_object *element;
439
440 if (package->type != ACPI_TYPE_PACKAGE)
441 return -EFAULT;
442 for (i = 0; i < num; ++i) {
443 if (package->package.count <= i)
444 return -EFAULT;
445 element = &package->package.elements[i];
446 if (offsets[i].mode) {
447 u8 *ptr = (u8 *)battery + offsets[i].offset;
448 u32 len = MAX_STRING_LENGTH;
449
450 switch (element->type) {
451 case ACPI_TYPE_BUFFER:
452 if (len > element->buffer.length + 1)
453 len = element->buffer.length + 1;
454
455 fallthrough;
456 case ACPI_TYPE_STRING:
457 strscpy(ptr, element->string.pointer, len);
458
459 break;
460 case ACPI_TYPE_INTEGER:
461 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1);
462
463 break;
464 default:
465 *ptr = 0; /* don't have value */
466 }
467 } else {
468 int *x = (int *)((u8 *)battery + offsets[i].offset);
469 *x = (element->type == ACPI_TYPE_INTEGER) ?
470 element->integer.value : -1;
471 }
472 }
473 return 0;
474 }
475
acpi_battery_get_status(struct acpi_battery * battery)476 static int acpi_battery_get_status(struct acpi_battery *battery)
477 {
478 if (acpi_bus_get_status(battery->device)) {
479 acpi_handle_info(battery->device->handle,
480 "_STA evaluation failed\n");
481 return -ENODEV;
482 }
483 return 0;
484 }
485
486
extract_battery_info(const int use_bix,struct acpi_battery * battery,const struct acpi_buffer * buffer)487 static int extract_battery_info(const int use_bix,
488 struct acpi_battery *battery,
489 const struct acpi_buffer *buffer)
490 {
491 int result = -EFAULT;
492
493 if (use_bix && battery_bix_broken_package)
494 result = extract_package(battery, buffer->pointer,
495 extended_info_offsets + 1,
496 ARRAY_SIZE(extended_info_offsets) - 1);
497 else if (use_bix)
498 result = extract_package(battery, buffer->pointer,
499 extended_info_offsets,
500 ARRAY_SIZE(extended_info_offsets));
501 else
502 result = extract_package(battery, buffer->pointer,
503 info_offsets, ARRAY_SIZE(info_offsets));
504 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
505 battery->full_charge_capacity = battery->design_capacity;
506 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
507 battery->power_unit && battery->design_voltage) {
508 battery->design_capacity = battery->design_capacity *
509 10000 / battery->design_voltage;
510 battery->full_charge_capacity = battery->full_charge_capacity *
511 10000 / battery->design_voltage;
512 battery->design_capacity_warning =
513 battery->design_capacity_warning *
514 10000 / battery->design_voltage;
515 /* Curiously, design_capacity_low, unlike the rest of them,
516 * is correct.
517 */
518 /* capacity_granularity_* equal 1 on the systems tested, so
519 * it's impossible to tell if they would need an adjustment
520 * or not if their values were higher.
521 */
522 }
523 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
524 battery->capacity_now > battery->full_charge_capacity)
525 battery->capacity_now = battery->full_charge_capacity;
526
527 return result;
528 }
529
acpi_battery_get_info(struct acpi_battery * battery)530 static int acpi_battery_get_info(struct acpi_battery *battery)
531 {
532 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
533 int use_bix;
534 int result = -ENODEV;
535
536 if (!acpi_battery_present(battery))
537 return 0;
538
539
540 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
541 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
542 acpi_status status = AE_ERROR;
543
544 status = acpi_evaluate_object(battery->device->handle,
545 use_bix ? "_BIX":"_BIF",
546 NULL, &buffer);
547
548 if (ACPI_FAILURE(status)) {
549 acpi_handle_info(battery->device->handle,
550 "%s evaluation failed: %s\n",
551 use_bix ? "_BIX":"_BIF",
552 acpi_format_exception(status));
553 } else {
554 result = extract_battery_info(use_bix,
555 battery,
556 &buffer);
557
558 kfree(buffer.pointer);
559 break;
560 }
561 }
562
563 if (!result && !use_bix && xinfo)
564 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
565
566 return result;
567 }
568
acpi_battery_get_state(struct acpi_battery * battery)569 static int acpi_battery_get_state(struct acpi_battery *battery)
570 {
571 int result = 0;
572 acpi_status status = 0;
573 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
574
575 if (!acpi_battery_present(battery))
576 return 0;
577
578 if (battery->update_time &&
579 time_before(jiffies, battery->update_time +
580 msecs_to_jiffies(cache_time)))
581 return 0;
582
583 status = acpi_evaluate_object(battery->device->handle, "_BST",
584 NULL, &buffer);
585 if (ACPI_FAILURE(status)) {
586 acpi_handle_info(battery->device->handle,
587 "_BST evaluation failed: %s",
588 acpi_format_exception(status));
589 return -ENODEV;
590 }
591
592 result = extract_package(battery, buffer.pointer,
593 state_offsets, ARRAY_SIZE(state_offsets));
594 battery->update_time = jiffies;
595 kfree(buffer.pointer);
596
597 /* For buggy DSDTs that report negative 16-bit values for either
598 * charging or discharging current and/or report 0 as 65536
599 * due to bad math.
600 */
601 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
602 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
603 (s16)(battery->rate_now) < 0) {
604 battery->rate_now = abs((s16)battery->rate_now);
605 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
606 }
607
608 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
609 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
610 battery->capacity_now = (battery->capacity_now *
611 battery->full_charge_capacity) / 100;
612 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
613 battery->power_unit && battery->design_voltage) {
614 battery->capacity_now = battery->capacity_now *
615 10000 / battery->design_voltage;
616 }
617 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
618 battery->capacity_now > battery->full_charge_capacity)
619 battery->capacity_now = battery->full_charge_capacity;
620
621 return result;
622 }
623
acpi_battery_set_alarm(struct acpi_battery * battery)624 static int acpi_battery_set_alarm(struct acpi_battery *battery)
625 {
626 acpi_status status = 0;
627
628 if (!acpi_battery_present(battery) ||
629 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
630 return -ENODEV;
631
632 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
633 battery->alarm);
634 if (ACPI_FAILURE(status))
635 return -ENODEV;
636
637 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
638 battery->alarm);
639
640 return 0;
641 }
642
acpi_battery_init_alarm(struct acpi_battery * battery)643 static int acpi_battery_init_alarm(struct acpi_battery *battery)
644 {
645 /* See if alarms are supported, and if so, set default */
646 if (!acpi_has_method(battery->device->handle, "_BTP")) {
647 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
648 return 0;
649 }
650 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
651 if (!battery->alarm)
652 battery->alarm = battery->design_capacity_warning;
653 return acpi_battery_set_alarm(battery);
654 }
655
acpi_battery_alarm_show(struct device * dev,struct device_attribute * attr,char * buf)656 static ssize_t acpi_battery_alarm_show(struct device *dev,
657 struct device_attribute *attr,
658 char *buf)
659 {
660 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
661
662 return sysfs_emit(buf, "%d\n", battery->alarm * 1000);
663 }
664
acpi_battery_alarm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)665 static ssize_t acpi_battery_alarm_store(struct device *dev,
666 struct device_attribute *attr,
667 const char *buf, size_t count)
668 {
669 unsigned long x;
670 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
671
672 if (sscanf(buf, "%lu\n", &x) == 1)
673 battery->alarm = x/1000;
674 if (acpi_battery_present(battery))
675 acpi_battery_set_alarm(battery);
676 return count;
677 }
678
679 static struct device_attribute alarm_attr = {
680 .attr = {.name = "alarm", .mode = 0644},
681 .show = acpi_battery_alarm_show,
682 .store = acpi_battery_alarm_store,
683 };
684
685 static struct attribute *acpi_battery_attrs[] = {
686 &alarm_attr.attr,
687 NULL
688 };
689 ATTRIBUTE_GROUPS(acpi_battery);
690
691 /*
692 * The Battery Hooking API
693 *
694 * This API is used inside other drivers that need to expose
695 * platform-specific behaviour within the generic driver in a
696 * generic way.
697 *
698 */
699
700 static LIST_HEAD(acpi_battery_list);
701 static LIST_HEAD(battery_hook_list);
702 static DEFINE_MUTEX(hook_mutex);
703
battery_hook_unregister_unlocked(struct acpi_battery_hook * hook)704 static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook)
705 {
706 struct acpi_battery *battery;
707
708 /*
709 * In order to remove a hook, we first need to
710 * de-register all the batteries that are registered.
711 */
712 list_for_each_entry(battery, &acpi_battery_list, list) {
713 if (!hook->remove_battery(battery->bat, hook))
714 power_supply_changed(battery->bat);
715 }
716 list_del_init(&hook->list);
717
718 pr_info("hook unregistered: %s\n", hook->name);
719 }
720
battery_hook_unregister(struct acpi_battery_hook * hook)721 void battery_hook_unregister(struct acpi_battery_hook *hook)
722 {
723 mutex_lock(&hook_mutex);
724 /*
725 * Ignore already unregistered battery hooks. This might happen
726 * if a battery hook was previously unloaded due to an error when
727 * adding a new battery.
728 */
729 if (!list_empty(&hook->list))
730 battery_hook_unregister_unlocked(hook);
731
732 mutex_unlock(&hook_mutex);
733 }
734 EXPORT_SYMBOL_GPL(battery_hook_unregister);
735
battery_hook_register(struct acpi_battery_hook * hook)736 void battery_hook_register(struct acpi_battery_hook *hook)
737 {
738 struct acpi_battery *battery;
739
740 mutex_lock(&hook_mutex);
741 list_add(&hook->list, &battery_hook_list);
742 /*
743 * Now that the driver is registered, we need
744 * to notify the hook that a battery is available
745 * for each battery, so that the driver may add
746 * its attributes.
747 */
748 list_for_each_entry(battery, &acpi_battery_list, list) {
749 if (hook->add_battery(battery->bat, hook)) {
750 /*
751 * If a add-battery returns non-zero,
752 * the registration of the hook has failed,
753 * and we will not add it to the list of loaded
754 * hooks.
755 */
756 pr_err("hook failed to load: %s", hook->name);
757 battery_hook_unregister_unlocked(hook);
758 goto end;
759 }
760
761 power_supply_changed(battery->bat);
762 }
763 pr_info("new hook: %s\n", hook->name);
764 end:
765 mutex_unlock(&hook_mutex);
766 }
767 EXPORT_SYMBOL_GPL(battery_hook_register);
768
devm_battery_hook_unregister(void * data)769 static void devm_battery_hook_unregister(void *data)
770 {
771 struct acpi_battery_hook *hook = data;
772
773 battery_hook_unregister(hook);
774 }
775
devm_battery_hook_register(struct device * dev,struct acpi_battery_hook * hook)776 int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook)
777 {
778 battery_hook_register(hook);
779
780 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook);
781 }
782 EXPORT_SYMBOL_GPL(devm_battery_hook_register);
783
784 /*
785 * This function gets called right after the battery sysfs
786 * attributes have been added, so that the drivers that
787 * define custom sysfs attributes can add their own.
788 */
battery_hook_add_battery(struct acpi_battery * battery)789 static void battery_hook_add_battery(struct acpi_battery *battery)
790 {
791 struct acpi_battery_hook *hook_node, *tmp;
792
793 mutex_lock(&hook_mutex);
794 INIT_LIST_HEAD(&battery->list);
795 list_add(&battery->list, &acpi_battery_list);
796 /*
797 * Since we added a new battery to the list, we need to
798 * iterate over the hooks and call add_battery for each
799 * hook that was registered. This usually happens
800 * when a battery gets hotplugged or initialized
801 * during the battery module initialization.
802 */
803 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
804 if (hook_node->add_battery(battery->bat, hook_node)) {
805 /*
806 * The notification of the hook has failed, to
807 * prevent further errors we will unload the hook.
808 */
809 pr_err("error in hook, unloading: %s",
810 hook_node->name);
811 battery_hook_unregister_unlocked(hook_node);
812 }
813 }
814 mutex_unlock(&hook_mutex);
815 }
816
battery_hook_remove_battery(struct acpi_battery * battery)817 static void battery_hook_remove_battery(struct acpi_battery *battery)
818 {
819 struct acpi_battery_hook *hook;
820
821 mutex_lock(&hook_mutex);
822 /*
823 * Before removing the hook, we need to remove all
824 * custom attributes from the battery.
825 */
826 list_for_each_entry(hook, &battery_hook_list, list) {
827 hook->remove_battery(battery->bat, hook);
828 }
829 /* Then, just remove the battery from the list */
830 list_del(&battery->list);
831 mutex_unlock(&hook_mutex);
832 }
833
battery_hook_exit(void)834 static void __exit battery_hook_exit(void)
835 {
836 struct acpi_battery_hook *hook;
837 struct acpi_battery_hook *ptr;
838 /*
839 * At this point, the acpi_bus_unregister_driver()
840 * has called remove for all batteries. We just
841 * need to remove the hooks.
842 */
843 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
844 battery_hook_unregister(hook);
845 }
846 mutex_destroy(&hook_mutex);
847 }
848
sysfs_add_battery(struct acpi_battery * battery)849 static int sysfs_add_battery(struct acpi_battery *battery)
850 {
851 struct power_supply_config psy_cfg = {
852 .drv_data = battery,
853 .attr_grp = acpi_battery_groups,
854 .no_wakeup_source = true,
855 };
856 bool full_cap_broken = false;
857
858 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
859 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
860 full_cap_broken = true;
861
862 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
863 if (full_cap_broken) {
864 battery->bat_desc.properties =
865 charge_battery_full_cap_broken_props;
866 battery->bat_desc.num_properties =
867 ARRAY_SIZE(charge_battery_full_cap_broken_props);
868 } else {
869 battery->bat_desc.properties = charge_battery_props;
870 battery->bat_desc.num_properties =
871 ARRAY_SIZE(charge_battery_props);
872 }
873 } else {
874 if (full_cap_broken) {
875 battery->bat_desc.properties =
876 energy_battery_full_cap_broken_props;
877 battery->bat_desc.num_properties =
878 ARRAY_SIZE(energy_battery_full_cap_broken_props);
879 } else {
880 battery->bat_desc.properties = energy_battery_props;
881 battery->bat_desc.num_properties =
882 ARRAY_SIZE(energy_battery_props);
883 }
884 }
885
886 battery->bat_desc.name = acpi_device_bid(battery->device);
887 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
888 battery->bat_desc.get_property = acpi_battery_get_property;
889
890 battery->bat = power_supply_register(&battery->device->dev,
891 &battery->bat_desc, &psy_cfg);
892
893 if (IS_ERR(battery->bat)) {
894 int result = PTR_ERR(battery->bat);
895
896 battery->bat = NULL;
897 return result;
898 }
899 battery_hook_add_battery(battery);
900 return 0;
901 }
902
sysfs_remove_battery(struct acpi_battery * battery)903 static void sysfs_remove_battery(struct acpi_battery *battery)
904 {
905 if (!battery->bat)
906 return;
907
908 battery_hook_remove_battery(battery);
909 power_supply_unregister(battery->bat);
910 battery->bat = NULL;
911 }
912
find_battery(const struct dmi_header * dm,void * private)913 static void find_battery(const struct dmi_header *dm, void *private)
914 {
915 struct acpi_battery *battery = (struct acpi_battery *)private;
916 /* Note: the hardcoded offsets below have been extracted from
917 * the source code of dmidecode.
918 */
919 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
920 const u8 *dmi_data = (const u8 *)(dm + 1);
921 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
922
923 if (dm->length >= 18)
924 dmi_capacity *= dmi_data[17];
925 if (battery->design_capacity * battery->design_voltage / 1000
926 != dmi_capacity &&
927 battery->design_capacity * 10 == dmi_capacity)
928 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
929 &battery->flags);
930 }
931 }
932
933 /*
934 * According to the ACPI spec, some kinds of primary batteries can
935 * report percentage battery remaining capacity directly to OS.
936 * In this case, it reports the Last Full Charged Capacity == 100
937 * and BatteryPresentRate == 0xFFFFFFFF.
938 *
939 * Now we found some battery reports percentage remaining capacity
940 * even if it's rechargeable.
941 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
942 *
943 * Handle this correctly so that they won't break userspace.
944 */
acpi_battery_quirks(struct acpi_battery * battery)945 static void acpi_battery_quirks(struct acpi_battery *battery)
946 {
947 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
948 return;
949
950 if (battery->full_charge_capacity == 100 &&
951 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
952 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
953 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
954 battery->full_charge_capacity = battery->design_capacity;
955 battery->capacity_now = (battery->capacity_now *
956 battery->full_charge_capacity) / 100;
957 }
958
959 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
960 return;
961
962 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
963 const char *s;
964
965 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
966 if (s && !strncasecmp(s, "ThinkPad", 8)) {
967 dmi_walk(find_battery, battery);
968 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
969 &battery->flags) &&
970 battery->design_voltage) {
971 battery->design_capacity =
972 battery->design_capacity *
973 10000 / battery->design_voltage;
974 battery->full_charge_capacity =
975 battery->full_charge_capacity *
976 10000 / battery->design_voltage;
977 battery->design_capacity_warning =
978 battery->design_capacity_warning *
979 10000 / battery->design_voltage;
980 battery->capacity_now = battery->capacity_now *
981 10000 / battery->design_voltage;
982 }
983 }
984 }
985
986 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
987 return;
988
989 if (acpi_battery_is_degraded(battery) &&
990 battery->capacity_now > battery->full_charge_capacity) {
991 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
992 battery->capacity_now = battery->full_charge_capacity;
993 }
994 }
995
acpi_battery_update(struct acpi_battery * battery,bool resume)996 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
997 {
998 int result = acpi_battery_get_status(battery);
999
1000 if (result)
1001 return result;
1002
1003 if (!acpi_battery_present(battery)) {
1004 sysfs_remove_battery(battery);
1005 battery->update_time = 0;
1006 return 0;
1007 }
1008
1009 if (resume)
1010 return 0;
1011
1012 if (!battery->update_time) {
1013 result = acpi_battery_get_info(battery);
1014 if (result)
1015 return result;
1016 acpi_battery_init_alarm(battery);
1017 }
1018
1019 result = acpi_battery_get_state(battery);
1020 if (result)
1021 return result;
1022 acpi_battery_quirks(battery);
1023
1024 if (!battery->bat) {
1025 result = sysfs_add_battery(battery);
1026 if (result)
1027 return result;
1028 }
1029
1030 /*
1031 * Wakeup the system if battery is critical low
1032 * or lower than the alarm level
1033 */
1034 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
1035 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1036 (battery->capacity_now <= battery->alarm)))
1037 acpi_pm_wakeup_event(battery->phys_dev);
1038
1039 return result;
1040 }
1041
acpi_battery_refresh(struct acpi_battery * battery)1042 static void acpi_battery_refresh(struct acpi_battery *battery)
1043 {
1044 int power_unit;
1045
1046 if (!battery->bat)
1047 return;
1048
1049 power_unit = battery->power_unit;
1050
1051 acpi_battery_get_info(battery);
1052
1053 if (power_unit == battery->power_unit)
1054 return;
1055
1056 /* The battery has changed its reporting units. */
1057 sysfs_remove_battery(battery);
1058 sysfs_add_battery(battery);
1059 }
1060
1061 /* Driver Interface */
acpi_battery_notify(acpi_handle handle,u32 event,void * data)1062 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
1063 {
1064 struct acpi_battery *battery = data;
1065 struct acpi_device *device = battery->device;
1066 struct power_supply *old;
1067
1068 guard(mutex)(&battery->update_lock);
1069
1070 old = battery->bat;
1071 /*
1072 * On Acer Aspire V5-573G notifications are sometimes triggered too
1073 * early. For example, when AC is unplugged and notification is
1074 * triggered, battery state is still reported as "Full", and changes to
1075 * "Discharging" only after short delay, without any notification.
1076 */
1077 if (battery_notification_delay_ms > 0)
1078 msleep(battery_notification_delay_ms);
1079 if (event == ACPI_BATTERY_NOTIFY_INFO)
1080 acpi_battery_refresh(battery);
1081 acpi_battery_update(battery, false);
1082 acpi_bus_generate_netlink_event(ACPI_BATTERY_CLASS,
1083 dev_name(&device->dev), event,
1084 acpi_battery_present(battery));
1085 acpi_notifier_call_chain(ACPI_BATTERY_CLASS, acpi_device_bid(device),
1086 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_battery *battery;
1219 struct acpi_device *device;
1220 int result;
1221
1222 device = ACPI_COMPANION(&pdev->dev);
1223 if (!device)
1224 return -ENODEV;
1225
1226 if (device->dep_unmet)
1227 return -EPROBE_DEFER;
1228
1229 battery = devm_kzalloc(&pdev->dev, sizeof(*battery), GFP_KERNEL);
1230 if (!battery)
1231 return -ENOMEM;
1232
1233 platform_set_drvdata(pdev, battery);
1234
1235 battery->phys_dev = &pdev->dev;
1236 battery->device = device;
1237
1238 result = devm_mutex_init(&pdev->dev, &battery->update_lock);
1239 if (result)
1240 return result;
1241
1242 if (acpi_has_method(battery->device->handle, "_BIX"))
1243 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1244
1245 result = acpi_battery_update_retry(battery);
1246 if (result)
1247 goto fail;
1248
1249 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1250 device->status.battery_present ? "present" : "absent");
1251
1252 battery->pm_nb.notifier_call = battery_notify;
1253 result = register_pm_notifier(&battery->pm_nb);
1254 if (result)
1255 goto fail;
1256
1257 device_init_wakeup(&pdev->dev, true);
1258
1259 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
1260 acpi_battery_notify, battery);
1261 if (result)
1262 goto fail_pm;
1263
1264 return 0;
1265
1266 fail_pm:
1267 device_init_wakeup(&pdev->dev, false);
1268 unregister_pm_notifier(&battery->pm_nb);
1269 fail:
1270 sysfs_battery_cleanup(battery);
1271
1272 return result;
1273 }
1274
acpi_battery_remove(struct platform_device * pdev)1275 static void acpi_battery_remove(struct platform_device *pdev)
1276 {
1277 struct acpi_battery *battery = platform_get_drvdata(pdev);
1278
1279 acpi_dev_remove_notify_handler(battery->device, ACPI_ALL_NOTIFY,
1280 acpi_battery_notify);
1281
1282 device_init_wakeup(&pdev->dev, false);
1283 unregister_pm_notifier(&battery->pm_nb);
1284
1285 sysfs_battery_cleanup(battery);
1286 }
1287
1288 /* this is needed to learn about changes made in suspended state */
acpi_battery_resume(struct device * dev)1289 static int acpi_battery_resume(struct device *dev)
1290 {
1291 struct acpi_battery *battery = dev_get_drvdata(dev);
1292
1293 if (!battery)
1294 return -EINVAL;
1295
1296 battery->update_time = 0;
1297
1298 guard(mutex)(&battery->update_lock);
1299
1300 acpi_battery_update(battery, true);
1301 return 0;
1302 }
1303
1304 static DEFINE_SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1305
1306 static struct platform_driver acpi_battery_driver = {
1307 .probe = acpi_battery_probe,
1308 .remove = acpi_battery_remove,
1309 .driver = {
1310 .name = "acpi-battery",
1311 .acpi_match_table = battery_device_ids,
1312 .pm = pm_sleep_ptr(&acpi_battery_pm),
1313 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1314 },
1315 };
1316
acpi_battery_init(void)1317 static int __init acpi_battery_init(void)
1318 {
1319 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery())
1320 return -ENODEV;
1321
1322 dmi_check_system(bat_dmi_table);
1323
1324 return platform_driver_register(&acpi_battery_driver);
1325 }
1326
acpi_battery_exit(void)1327 static void __exit acpi_battery_exit(void)
1328 {
1329 platform_driver_unregister(&acpi_battery_driver);
1330 battery_hook_exit();
1331 }
1332
1333 module_init(acpi_battery_init);
1334 module_exit(acpi_battery_exit);
1335