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 notifier_block pm_nb;
98 struct list_head list;
99 unsigned long update_time;
100 int revision;
101 int rate_now;
102 int capacity_now;
103 int voltage_now;
104 int design_capacity;
105 int full_charge_capacity;
106 int technology;
107 int design_voltage;
108 int design_capacity_warning;
109 int design_capacity_low;
110 int cycle_count;
111 int measurement_accuracy;
112 int max_sampling_time;
113 int min_sampling_time;
114 int max_averaging_interval;
115 int min_averaging_interval;
116 int capacity_granularity_1;
117 int capacity_granularity_2;
118 int alarm;
119 char model_number[MAX_STRING_LENGTH];
120 char serial_number[MAX_STRING_LENGTH];
121 char type[MAX_STRING_LENGTH];
122 char oem_info[MAX_STRING_LENGTH];
123 int state;
124 int power_unit;
125 unsigned long flags;
126 };
127
128 #define to_acpi_battery(x) power_supply_get_drvdata(x)
129
acpi_battery_present(struct acpi_battery * battery)130 static inline int acpi_battery_present(struct acpi_battery *battery)
131 {
132 return battery->device->status.battery_present;
133 }
134
acpi_battery_technology(struct acpi_battery * battery)135 static int acpi_battery_technology(struct acpi_battery *battery)
136 {
137 if (!strcasecmp("NiCd", battery->type))
138 return POWER_SUPPLY_TECHNOLOGY_NiCd;
139 if (!strcasecmp("NiMH", battery->type))
140 return POWER_SUPPLY_TECHNOLOGY_NiMH;
141 if (!strcasecmp("LION", battery->type))
142 return POWER_SUPPLY_TECHNOLOGY_LION;
143 if (!strncasecmp("LI-ION", battery->type, 6))
144 return POWER_SUPPLY_TECHNOLOGY_LION;
145 if (!strcasecmp("LiP", battery->type))
146 return POWER_SUPPLY_TECHNOLOGY_LIPO;
147 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
148 }
149
150 static int acpi_battery_get_state(struct acpi_battery *battery);
151
acpi_battery_is_charged(struct acpi_battery * battery)152 static int acpi_battery_is_charged(struct acpi_battery *battery)
153 {
154 /* charging, discharging, critical low or charge limited */
155 if (battery->state != 0)
156 return 0;
157
158 /* battery not reporting charge */
159 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
160 battery->capacity_now == 0)
161 return 0;
162
163 /* good batteries update full_charge as the batteries degrade */
164 if (battery->full_charge_capacity == battery->capacity_now)
165 return 1;
166
167 /* fallback to using design values for broken batteries */
168 if (battery->design_capacity <= battery->capacity_now)
169 return 1;
170
171 /* we don't do any sort of metric based on percentages */
172 return 0;
173 }
174
acpi_battery_is_degraded(struct acpi_battery * battery)175 static bool acpi_battery_is_degraded(struct acpi_battery *battery)
176 {
177 return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
178 ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
179 battery->full_charge_capacity < battery->design_capacity;
180 }
181
acpi_battery_handle_discharging(struct acpi_battery * battery)182 static int acpi_battery_handle_discharging(struct acpi_battery *battery)
183 {
184 /*
185 * Some devices wrongly report discharging if the battery's charge level
186 * was above the device's start charging threshold atm the AC adapter
187 * was plugged in and the device thus did not start a new charge cycle.
188 */
189 if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
190 battery->rate_now == 0)
191 return POWER_SUPPLY_STATUS_NOT_CHARGING;
192
193 return POWER_SUPPLY_STATUS_DISCHARGING;
194 }
195
acpi_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)196 static int acpi_battery_get_property(struct power_supply *psy,
197 enum power_supply_property psp,
198 union power_supply_propval *val)
199 {
200 int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
201 struct acpi_battery *battery = to_acpi_battery(psy);
202
203 if (acpi_battery_present(battery)) {
204 /* run battery update only if it is present */
205 acpi_battery_get_state(battery);
206 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
207 return -ENODEV;
208 switch (psp) {
209 case POWER_SUPPLY_PROP_STATUS:
210 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
211 val->intval = acpi_battery_handle_discharging(battery);
212 else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
213 /* Validate the status by checking the current. */
214 if (battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
215 battery->rate_now == 0) {
216 /* On charge but no current (0W/0mA). */
217 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
218 } else {
219 val->intval = POWER_SUPPLY_STATUS_CHARGING;
220 }
221 else if (battery->state & ACPI_BATTERY_STATE_CHARGE_LIMITING)
222 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
223 else if (acpi_battery_is_charged(battery))
224 val->intval = POWER_SUPPLY_STATUS_FULL;
225 else
226 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
227 break;
228 case POWER_SUPPLY_PROP_PRESENT:
229 val->intval = acpi_battery_present(battery);
230 break;
231 case POWER_SUPPLY_PROP_TECHNOLOGY:
232 val->intval = acpi_battery_technology(battery);
233 break;
234 case POWER_SUPPLY_PROP_CYCLE_COUNT:
235 val->intval = battery->cycle_count;
236 break;
237 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
238 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
239 ret = -ENODEV;
240 else
241 val->intval = battery->design_voltage * 1000;
242 break;
243 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
244 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
245 ret = -ENODEV;
246 else
247 val->intval = battery->voltage_now * 1000;
248 break;
249 case POWER_SUPPLY_PROP_CURRENT_NOW:
250 case POWER_SUPPLY_PROP_POWER_NOW:
251 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
252 ret = -ENODEV;
253 else
254 val->intval = battery->rate_now * 1000;
255 break;
256 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
257 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
258 if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
259 ret = -ENODEV;
260 else
261 val->intval = battery->design_capacity * 1000;
262 break;
263 case POWER_SUPPLY_PROP_CHARGE_FULL:
264 case POWER_SUPPLY_PROP_ENERGY_FULL:
265 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
266 ret = -ENODEV;
267 else
268 val->intval = battery->full_charge_capacity * 1000;
269 break;
270 case POWER_SUPPLY_PROP_CHARGE_NOW:
271 case POWER_SUPPLY_PROP_ENERGY_NOW:
272 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
273 ret = -ENODEV;
274 else
275 val->intval = battery->capacity_now * 1000;
276 break;
277 case POWER_SUPPLY_PROP_CAPACITY:
278 if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
279 full_capacity = battery->full_charge_capacity;
280 else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
281 full_capacity = battery->design_capacity;
282
283 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
284 full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
285 ret = -ENODEV;
286 else
287 val->intval = DIV_ROUND_CLOSEST_ULL(battery->capacity_now * 100ULL,
288 full_capacity);
289 break;
290 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
291 if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
292 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
293 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
294 (battery->capacity_now <= battery->alarm))
295 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
296 else if (acpi_battery_is_charged(battery))
297 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
298 else
299 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
300 break;
301 case POWER_SUPPLY_PROP_MODEL_NAME:
302 val->strval = battery->model_number;
303 break;
304 case POWER_SUPPLY_PROP_MANUFACTURER:
305 val->strval = battery->oem_info;
306 break;
307 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
308 val->strval = battery->serial_number;
309 break;
310 default:
311 ret = -EINVAL;
312 }
313 return ret;
314 }
315
316 static const enum power_supply_property charge_battery_props[] = {
317 POWER_SUPPLY_PROP_STATUS,
318 POWER_SUPPLY_PROP_PRESENT,
319 POWER_SUPPLY_PROP_TECHNOLOGY,
320 POWER_SUPPLY_PROP_CYCLE_COUNT,
321 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
322 POWER_SUPPLY_PROP_VOLTAGE_NOW,
323 POWER_SUPPLY_PROP_CURRENT_NOW,
324 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
325 POWER_SUPPLY_PROP_CHARGE_FULL,
326 POWER_SUPPLY_PROP_CHARGE_NOW,
327 POWER_SUPPLY_PROP_CAPACITY,
328 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
329 POWER_SUPPLY_PROP_MODEL_NAME,
330 POWER_SUPPLY_PROP_MANUFACTURER,
331 POWER_SUPPLY_PROP_SERIAL_NUMBER,
332 };
333
334 static const enum power_supply_property charge_battery_full_cap_broken_props[] = {
335 POWER_SUPPLY_PROP_STATUS,
336 POWER_SUPPLY_PROP_PRESENT,
337 POWER_SUPPLY_PROP_TECHNOLOGY,
338 POWER_SUPPLY_PROP_CYCLE_COUNT,
339 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
340 POWER_SUPPLY_PROP_VOLTAGE_NOW,
341 POWER_SUPPLY_PROP_CURRENT_NOW,
342 POWER_SUPPLY_PROP_CHARGE_NOW,
343 POWER_SUPPLY_PROP_MODEL_NAME,
344 POWER_SUPPLY_PROP_MANUFACTURER,
345 POWER_SUPPLY_PROP_SERIAL_NUMBER,
346 };
347
348 static const enum power_supply_property energy_battery_props[] = {
349 POWER_SUPPLY_PROP_STATUS,
350 POWER_SUPPLY_PROP_PRESENT,
351 POWER_SUPPLY_PROP_TECHNOLOGY,
352 POWER_SUPPLY_PROP_CYCLE_COUNT,
353 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
354 POWER_SUPPLY_PROP_VOLTAGE_NOW,
355 POWER_SUPPLY_PROP_POWER_NOW,
356 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
357 POWER_SUPPLY_PROP_ENERGY_FULL,
358 POWER_SUPPLY_PROP_ENERGY_NOW,
359 POWER_SUPPLY_PROP_CAPACITY,
360 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
361 POWER_SUPPLY_PROP_MODEL_NAME,
362 POWER_SUPPLY_PROP_MANUFACTURER,
363 POWER_SUPPLY_PROP_SERIAL_NUMBER,
364 };
365
366 static const enum power_supply_property energy_battery_full_cap_broken_props[] = {
367 POWER_SUPPLY_PROP_STATUS,
368 POWER_SUPPLY_PROP_PRESENT,
369 POWER_SUPPLY_PROP_TECHNOLOGY,
370 POWER_SUPPLY_PROP_CYCLE_COUNT,
371 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
372 POWER_SUPPLY_PROP_VOLTAGE_NOW,
373 POWER_SUPPLY_PROP_POWER_NOW,
374 POWER_SUPPLY_PROP_ENERGY_NOW,
375 POWER_SUPPLY_PROP_MODEL_NAME,
376 POWER_SUPPLY_PROP_MANUFACTURER,
377 POWER_SUPPLY_PROP_SERIAL_NUMBER,
378 };
379
380 /* Battery Management */
381 struct acpi_offsets {
382 size_t offset; /* offset inside struct acpi_sbs_battery */
383 u8 mode; /* int or string? */
384 };
385
386 static const struct acpi_offsets state_offsets[] = {
387 {offsetof(struct acpi_battery, state), 0},
388 {offsetof(struct acpi_battery, rate_now), 0},
389 {offsetof(struct acpi_battery, capacity_now), 0},
390 {offsetof(struct acpi_battery, voltage_now), 0},
391 };
392
393 static const struct acpi_offsets info_offsets[] = {
394 {offsetof(struct acpi_battery, power_unit), 0},
395 {offsetof(struct acpi_battery, design_capacity), 0},
396 {offsetof(struct acpi_battery, full_charge_capacity), 0},
397 {offsetof(struct acpi_battery, technology), 0},
398 {offsetof(struct acpi_battery, design_voltage), 0},
399 {offsetof(struct acpi_battery, design_capacity_warning), 0},
400 {offsetof(struct acpi_battery, design_capacity_low), 0},
401 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
402 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
403 {offsetof(struct acpi_battery, model_number), 1},
404 {offsetof(struct acpi_battery, serial_number), 1},
405 {offsetof(struct acpi_battery, type), 1},
406 {offsetof(struct acpi_battery, oem_info), 1},
407 };
408
409 static const struct acpi_offsets extended_info_offsets[] = {
410 {offsetof(struct acpi_battery, revision), 0},
411 {offsetof(struct acpi_battery, power_unit), 0},
412 {offsetof(struct acpi_battery, design_capacity), 0},
413 {offsetof(struct acpi_battery, full_charge_capacity), 0},
414 {offsetof(struct acpi_battery, technology), 0},
415 {offsetof(struct acpi_battery, design_voltage), 0},
416 {offsetof(struct acpi_battery, design_capacity_warning), 0},
417 {offsetof(struct acpi_battery, design_capacity_low), 0},
418 {offsetof(struct acpi_battery, cycle_count), 0},
419 {offsetof(struct acpi_battery, measurement_accuracy), 0},
420 {offsetof(struct acpi_battery, max_sampling_time), 0},
421 {offsetof(struct acpi_battery, min_sampling_time), 0},
422 {offsetof(struct acpi_battery, max_averaging_interval), 0},
423 {offsetof(struct acpi_battery, min_averaging_interval), 0},
424 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
425 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
426 {offsetof(struct acpi_battery, model_number), 1},
427 {offsetof(struct acpi_battery, serial_number), 1},
428 {offsetof(struct acpi_battery, type), 1},
429 {offsetof(struct acpi_battery, oem_info), 1},
430 };
431
extract_package(struct acpi_battery * battery,union acpi_object * package,const struct acpi_offsets * offsets,int num)432 static int extract_package(struct acpi_battery *battery,
433 union acpi_object *package,
434 const struct acpi_offsets *offsets, int num)
435 {
436 int i;
437 union acpi_object *element;
438
439 if (package->type != ACPI_TYPE_PACKAGE)
440 return -EFAULT;
441 for (i = 0; i < num; ++i) {
442 if (package->package.count <= i)
443 return -EFAULT;
444 element = &package->package.elements[i];
445 if (offsets[i].mode) {
446 u8 *ptr = (u8 *)battery + offsets[i].offset;
447 u32 len = MAX_STRING_LENGTH;
448
449 switch (element->type) {
450 case ACPI_TYPE_BUFFER:
451 if (len > element->buffer.length + 1)
452 len = element->buffer.length + 1;
453
454 fallthrough;
455 case ACPI_TYPE_STRING:
456 strscpy(ptr, element->string.pointer, len);
457
458 break;
459 case ACPI_TYPE_INTEGER:
460 strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1);
461
462 break;
463 default:
464 *ptr = 0; /* don't have value */
465 }
466 } else {
467 int *x = (int *)((u8 *)battery + offsets[i].offset);
468 *x = (element->type == ACPI_TYPE_INTEGER) ?
469 element->integer.value : -1;
470 }
471 }
472 return 0;
473 }
474
acpi_battery_get_status(struct acpi_battery * battery)475 static int acpi_battery_get_status(struct acpi_battery *battery)
476 {
477 if (acpi_bus_get_status(battery->device)) {
478 acpi_handle_info(battery->device->handle,
479 "_STA evaluation failed\n");
480 return -ENODEV;
481 }
482 return 0;
483 }
484
485
extract_battery_info(const int use_bix,struct acpi_battery * battery,const struct acpi_buffer * buffer)486 static int extract_battery_info(const int use_bix,
487 struct acpi_battery *battery,
488 const struct acpi_buffer *buffer)
489 {
490 int result = -EFAULT;
491
492 if (use_bix && battery_bix_broken_package)
493 result = extract_package(battery, buffer->pointer,
494 extended_info_offsets + 1,
495 ARRAY_SIZE(extended_info_offsets) - 1);
496 else if (use_bix)
497 result = extract_package(battery, buffer->pointer,
498 extended_info_offsets,
499 ARRAY_SIZE(extended_info_offsets));
500 else
501 result = extract_package(battery, buffer->pointer,
502 info_offsets, ARRAY_SIZE(info_offsets));
503 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
504 battery->full_charge_capacity = battery->design_capacity;
505 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
506 battery->power_unit && battery->design_voltage) {
507 battery->design_capacity = battery->design_capacity *
508 10000 / battery->design_voltage;
509 battery->full_charge_capacity = battery->full_charge_capacity *
510 10000 / battery->design_voltage;
511 battery->design_capacity_warning =
512 battery->design_capacity_warning *
513 10000 / battery->design_voltage;
514 /* Curiously, design_capacity_low, unlike the rest of them,
515 * is correct.
516 */
517 /* capacity_granularity_* equal 1 on the systems tested, so
518 * it's impossible to tell if they would need an adjustment
519 * or not if their values were higher.
520 */
521 }
522 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
523 battery->capacity_now > battery->full_charge_capacity)
524 battery->capacity_now = battery->full_charge_capacity;
525
526 return result;
527 }
528
acpi_battery_get_info(struct acpi_battery * battery)529 static int acpi_battery_get_info(struct acpi_battery *battery)
530 {
531 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
532 int use_bix;
533 int result = -ENODEV;
534
535 if (!acpi_battery_present(battery))
536 return 0;
537
538
539 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
540 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
541 acpi_status status = AE_ERROR;
542
543 status = acpi_evaluate_object(battery->device->handle,
544 use_bix ? "_BIX":"_BIF",
545 NULL, &buffer);
546
547 if (ACPI_FAILURE(status)) {
548 acpi_handle_info(battery->device->handle,
549 "%s evaluation failed: %s\n",
550 use_bix ? "_BIX":"_BIF",
551 acpi_format_exception(status));
552 } else {
553 result = extract_battery_info(use_bix,
554 battery,
555 &buffer);
556
557 kfree(buffer.pointer);
558 break;
559 }
560 }
561
562 if (!result && !use_bix && xinfo)
563 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
564
565 return result;
566 }
567
acpi_battery_get_state(struct acpi_battery * battery)568 static int acpi_battery_get_state(struct acpi_battery *battery)
569 {
570 int result = 0;
571 acpi_status status = 0;
572 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
573
574 if (!acpi_battery_present(battery))
575 return 0;
576
577 if (battery->update_time &&
578 time_before(jiffies, battery->update_time +
579 msecs_to_jiffies(cache_time)))
580 return 0;
581
582 status = acpi_evaluate_object(battery->device->handle, "_BST",
583 NULL, &buffer);
584 if (ACPI_FAILURE(status)) {
585 acpi_handle_info(battery->device->handle,
586 "_BST evaluation failed: %s",
587 acpi_format_exception(status));
588 return -ENODEV;
589 }
590
591 result = extract_package(battery, buffer.pointer,
592 state_offsets, ARRAY_SIZE(state_offsets));
593 battery->update_time = jiffies;
594 kfree(buffer.pointer);
595
596 /* For buggy DSDTs that report negative 16-bit values for either
597 * charging or discharging current and/or report 0 as 65536
598 * due to bad math.
599 */
600 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
601 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
602 (s16)(battery->rate_now) < 0) {
603 battery->rate_now = abs((s16)battery->rate_now);
604 pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
605 }
606
607 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
608 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
609 battery->capacity_now = (battery->capacity_now *
610 battery->full_charge_capacity) / 100;
611 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
612 battery->power_unit && battery->design_voltage) {
613 battery->capacity_now = battery->capacity_now *
614 10000 / battery->design_voltage;
615 }
616 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
617 battery->capacity_now > battery->full_charge_capacity)
618 battery->capacity_now = battery->full_charge_capacity;
619
620 return result;
621 }
622
acpi_battery_set_alarm(struct acpi_battery * battery)623 static int acpi_battery_set_alarm(struct acpi_battery *battery)
624 {
625 acpi_status status = 0;
626
627 if (!acpi_battery_present(battery) ||
628 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
629 return -ENODEV;
630
631 status = acpi_execute_simple_method(battery->device->handle, "_BTP",
632 battery->alarm);
633 if (ACPI_FAILURE(status))
634 return -ENODEV;
635
636 acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
637 battery->alarm);
638
639 return 0;
640 }
641
acpi_battery_init_alarm(struct acpi_battery * battery)642 static int acpi_battery_init_alarm(struct acpi_battery *battery)
643 {
644 /* See if alarms are supported, and if so, set default */
645 if (!acpi_has_method(battery->device->handle, "_BTP")) {
646 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
647 return 0;
648 }
649 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
650 if (!battery->alarm)
651 battery->alarm = battery->design_capacity_warning;
652 return acpi_battery_set_alarm(battery);
653 }
654
acpi_battery_alarm_show(struct device * dev,struct device_attribute * attr,char * buf)655 static ssize_t acpi_battery_alarm_show(struct device *dev,
656 struct device_attribute *attr,
657 char *buf)
658 {
659 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
660
661 return sysfs_emit(buf, "%d\n", battery->alarm * 1000);
662 }
663
acpi_battery_alarm_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)664 static ssize_t acpi_battery_alarm_store(struct device *dev,
665 struct device_attribute *attr,
666 const char *buf, size_t count)
667 {
668 unsigned long x;
669 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
670
671 if (sscanf(buf, "%lu\n", &x) == 1)
672 battery->alarm = x/1000;
673 if (acpi_battery_present(battery))
674 acpi_battery_set_alarm(battery);
675 return count;
676 }
677
678 static struct device_attribute alarm_attr = {
679 .attr = {.name = "alarm", .mode = 0644},
680 .show = acpi_battery_alarm_show,
681 .store = acpi_battery_alarm_store,
682 };
683
684 static struct attribute *acpi_battery_attrs[] = {
685 &alarm_attr.attr,
686 NULL
687 };
688 ATTRIBUTE_GROUPS(acpi_battery);
689
690 /*
691 * The Battery Hooking API
692 *
693 * This API is used inside other drivers that need to expose
694 * platform-specific behaviour within the generic driver in a
695 * generic way.
696 *
697 */
698
699 static LIST_HEAD(acpi_battery_list);
700 static LIST_HEAD(battery_hook_list);
701 static DEFINE_MUTEX(hook_mutex);
702
battery_hook_unregister_unlocked(struct acpi_battery_hook * hook)703 static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook)
704 {
705 struct acpi_battery *battery;
706
707 /*
708 * In order to remove a hook, we first need to
709 * de-register all the batteries that are registered.
710 */
711 list_for_each_entry(battery, &acpi_battery_list, list) {
712 if (!hook->remove_battery(battery->bat, hook))
713 power_supply_changed(battery->bat);
714 }
715 list_del_init(&hook->list);
716
717 pr_info("hook unregistered: %s\n", hook->name);
718 }
719
battery_hook_unregister(struct acpi_battery_hook * hook)720 void battery_hook_unregister(struct acpi_battery_hook *hook)
721 {
722 mutex_lock(&hook_mutex);
723 /*
724 * Ignore already unregistered battery hooks. This might happen
725 * if a battery hook was previously unloaded due to an error when
726 * adding a new battery.
727 */
728 if (!list_empty(&hook->list))
729 battery_hook_unregister_unlocked(hook);
730
731 mutex_unlock(&hook_mutex);
732 }
733 EXPORT_SYMBOL_GPL(battery_hook_unregister);
734
battery_hook_register(struct acpi_battery_hook * hook)735 void battery_hook_register(struct acpi_battery_hook *hook)
736 {
737 struct acpi_battery *battery;
738
739 mutex_lock(&hook_mutex);
740 list_add(&hook->list, &battery_hook_list);
741 /*
742 * Now that the driver is registered, we need
743 * to notify the hook that a battery is available
744 * for each battery, so that the driver may add
745 * its attributes.
746 */
747 list_for_each_entry(battery, &acpi_battery_list, list) {
748 if (hook->add_battery(battery->bat, hook)) {
749 /*
750 * If a add-battery returns non-zero,
751 * the registration of the hook has failed,
752 * and we will not add it to the list of loaded
753 * hooks.
754 */
755 pr_err("hook failed to load: %s", hook->name);
756 battery_hook_unregister_unlocked(hook);
757 goto end;
758 }
759
760 power_supply_changed(battery->bat);
761 }
762 pr_info("new hook: %s\n", hook->name);
763 end:
764 mutex_unlock(&hook_mutex);
765 }
766 EXPORT_SYMBOL_GPL(battery_hook_register);
767
devm_battery_hook_unregister(void * data)768 static void devm_battery_hook_unregister(void *data)
769 {
770 struct acpi_battery_hook *hook = data;
771
772 battery_hook_unregister(hook);
773 }
774
devm_battery_hook_register(struct device * dev,struct acpi_battery_hook * hook)775 int devm_battery_hook_register(struct device *dev, struct acpi_battery_hook *hook)
776 {
777 battery_hook_register(hook);
778
779 return devm_add_action_or_reset(dev, devm_battery_hook_unregister, hook);
780 }
781 EXPORT_SYMBOL_GPL(devm_battery_hook_register);
782
783 /*
784 * This function gets called right after the battery sysfs
785 * attributes have been added, so that the drivers that
786 * define custom sysfs attributes can add their own.
787 */
battery_hook_add_battery(struct acpi_battery * battery)788 static void battery_hook_add_battery(struct acpi_battery *battery)
789 {
790 struct acpi_battery_hook *hook_node, *tmp;
791
792 mutex_lock(&hook_mutex);
793 INIT_LIST_HEAD(&battery->list);
794 list_add(&battery->list, &acpi_battery_list);
795 /*
796 * Since we added a new battery to the list, we need to
797 * iterate over the hooks and call add_battery for each
798 * hook that was registered. This usually happens
799 * when a battery gets hotplugged or initialized
800 * during the battery module initialization.
801 */
802 list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
803 if (hook_node->add_battery(battery->bat, hook_node)) {
804 /*
805 * The notification of the hook has failed, to
806 * prevent further errors we will unload the hook.
807 */
808 pr_err("error in hook, unloading: %s",
809 hook_node->name);
810 battery_hook_unregister_unlocked(hook_node);
811 }
812 }
813 mutex_unlock(&hook_mutex);
814 }
815
battery_hook_remove_battery(struct acpi_battery * battery)816 static void battery_hook_remove_battery(struct acpi_battery *battery)
817 {
818 struct acpi_battery_hook *hook;
819
820 mutex_lock(&hook_mutex);
821 /*
822 * Before removing the hook, we need to remove all
823 * custom attributes from the battery.
824 */
825 list_for_each_entry(hook, &battery_hook_list, list) {
826 hook->remove_battery(battery->bat, hook);
827 }
828 /* Then, just remove the battery from the list */
829 list_del(&battery->list);
830 mutex_unlock(&hook_mutex);
831 }
832
battery_hook_exit(void)833 static void __exit battery_hook_exit(void)
834 {
835 struct acpi_battery_hook *hook;
836 struct acpi_battery_hook *ptr;
837 /*
838 * At this point, the acpi_bus_unregister_driver()
839 * has called remove for all batteries. We just
840 * need to remove the hooks.
841 */
842 list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
843 battery_hook_unregister(hook);
844 }
845 mutex_destroy(&hook_mutex);
846 }
847
sysfs_add_battery(struct acpi_battery * battery)848 static int sysfs_add_battery(struct acpi_battery *battery)
849 {
850 struct power_supply_config psy_cfg = {
851 .drv_data = battery,
852 .attr_grp = acpi_battery_groups,
853 .no_wakeup_source = true,
854 };
855 bool full_cap_broken = false;
856
857 if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
858 !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
859 full_cap_broken = true;
860
861 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
862 if (full_cap_broken) {
863 battery->bat_desc.properties =
864 charge_battery_full_cap_broken_props;
865 battery->bat_desc.num_properties =
866 ARRAY_SIZE(charge_battery_full_cap_broken_props);
867 } else {
868 battery->bat_desc.properties = charge_battery_props;
869 battery->bat_desc.num_properties =
870 ARRAY_SIZE(charge_battery_props);
871 }
872 } else {
873 if (full_cap_broken) {
874 battery->bat_desc.properties =
875 energy_battery_full_cap_broken_props;
876 battery->bat_desc.num_properties =
877 ARRAY_SIZE(energy_battery_full_cap_broken_props);
878 } else {
879 battery->bat_desc.properties = energy_battery_props;
880 battery->bat_desc.num_properties =
881 ARRAY_SIZE(energy_battery_props);
882 }
883 }
884
885 battery->bat_desc.name = acpi_device_bid(battery->device);
886 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
887 battery->bat_desc.get_property = acpi_battery_get_property;
888
889 battery->bat = power_supply_register(&battery->device->dev,
890 &battery->bat_desc, &psy_cfg);
891
892 if (IS_ERR(battery->bat)) {
893 int result = PTR_ERR(battery->bat);
894
895 battery->bat = NULL;
896 return result;
897 }
898 battery_hook_add_battery(battery);
899 return 0;
900 }
901
sysfs_remove_battery(struct acpi_battery * battery)902 static void sysfs_remove_battery(struct acpi_battery *battery)
903 {
904 if (!battery->bat)
905 return;
906
907 battery_hook_remove_battery(battery);
908 power_supply_unregister(battery->bat);
909 battery->bat = NULL;
910 }
911
find_battery(const struct dmi_header * dm,void * private)912 static void find_battery(const struct dmi_header *dm, void *private)
913 {
914 struct acpi_battery *battery = (struct acpi_battery *)private;
915 /* Note: the hardcoded offsets below have been extracted from
916 * the source code of dmidecode.
917 */
918 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
919 const u8 *dmi_data = (const u8 *)(dm + 1);
920 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
921
922 if (dm->length >= 18)
923 dmi_capacity *= dmi_data[17];
924 if (battery->design_capacity * battery->design_voltage / 1000
925 != dmi_capacity &&
926 battery->design_capacity * 10 == dmi_capacity)
927 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
928 &battery->flags);
929 }
930 }
931
932 /*
933 * According to the ACPI spec, some kinds of primary batteries can
934 * report percentage battery remaining capacity directly to OS.
935 * In this case, it reports the Last Full Charged Capacity == 100
936 * and BatteryPresentRate == 0xFFFFFFFF.
937 *
938 * Now we found some battery reports percentage remaining capacity
939 * even if it's rechargeable.
940 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
941 *
942 * Handle this correctly so that they won't break userspace.
943 */
acpi_battery_quirks(struct acpi_battery * battery)944 static void acpi_battery_quirks(struct acpi_battery *battery)
945 {
946 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
947 return;
948
949 if (battery->full_charge_capacity == 100 &&
950 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
951 battery->capacity_now >= 0 && battery->capacity_now <= 100) {
952 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
953 battery->full_charge_capacity = battery->design_capacity;
954 battery->capacity_now = (battery->capacity_now *
955 battery->full_charge_capacity) / 100;
956 }
957
958 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
959 return;
960
961 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
962 const char *s;
963
964 s = dmi_get_system_info(DMI_PRODUCT_VERSION);
965 if (s && !strncasecmp(s, "ThinkPad", 8)) {
966 dmi_walk(find_battery, battery);
967 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
968 &battery->flags) &&
969 battery->design_voltage) {
970 battery->design_capacity =
971 battery->design_capacity *
972 10000 / battery->design_voltage;
973 battery->full_charge_capacity =
974 battery->full_charge_capacity *
975 10000 / battery->design_voltage;
976 battery->design_capacity_warning =
977 battery->design_capacity_warning *
978 10000 / battery->design_voltage;
979 battery->capacity_now = battery->capacity_now *
980 10000 / battery->design_voltage;
981 }
982 }
983 }
984
985 if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
986 return;
987
988 if (acpi_battery_is_degraded(battery) &&
989 battery->capacity_now > battery->full_charge_capacity) {
990 set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
991 battery->capacity_now = battery->full_charge_capacity;
992 }
993 }
994
acpi_battery_update(struct acpi_battery * battery,bool resume)995 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
996 {
997 int result = acpi_battery_get_status(battery);
998
999 if (result)
1000 return result;
1001
1002 if (!acpi_battery_present(battery)) {
1003 sysfs_remove_battery(battery);
1004 battery->update_time = 0;
1005 return 0;
1006 }
1007
1008 if (resume)
1009 return 0;
1010
1011 if (!battery->update_time) {
1012 result = acpi_battery_get_info(battery);
1013 if (result)
1014 return result;
1015 acpi_battery_init_alarm(battery);
1016 }
1017
1018 result = acpi_battery_get_state(battery);
1019 if (result)
1020 return result;
1021 acpi_battery_quirks(battery);
1022
1023 if (!battery->bat) {
1024 result = sysfs_add_battery(battery);
1025 if (result)
1026 return result;
1027 }
1028
1029 /*
1030 * Wakeup the system if battery is critical low
1031 * or lower than the alarm level
1032 */
1033 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
1034 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
1035 (battery->capacity_now <= battery->alarm)))
1036 acpi_pm_wakeup_event(&battery->device->dev);
1037
1038 return result;
1039 }
1040
acpi_battery_refresh(struct acpi_battery * battery)1041 static void acpi_battery_refresh(struct acpi_battery *battery)
1042 {
1043 int power_unit;
1044
1045 if (!battery->bat)
1046 return;
1047
1048 power_unit = battery->power_unit;
1049
1050 acpi_battery_get_info(battery);
1051
1052 if (power_unit == battery->power_unit)
1053 return;
1054
1055 /* The battery has changed its reporting units. */
1056 sysfs_remove_battery(battery);
1057 sysfs_add_battery(battery);
1058 }
1059
1060 /* Driver Interface */
acpi_battery_notify(acpi_handle handle,u32 event,void * data)1061 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
1062 {
1063 struct acpi_battery *battery = data;
1064 struct acpi_device *device = battery->device;
1065 struct power_supply *old;
1066
1067 guard(mutex)(&battery->update_lock);
1068
1069 old = battery->bat;
1070 /*
1071 * On Acer Aspire V5-573G notifications are sometimes triggered too
1072 * early. For example, when AC is unplugged and notification is
1073 * triggered, battery state is still reported as "Full", and changes to
1074 * "Discharging" only after short delay, without any notification.
1075 */
1076 if (battery_notification_delay_ms > 0)
1077 msleep(battery_notification_delay_ms);
1078 if (event == ACPI_BATTERY_NOTIFY_INFO)
1079 acpi_battery_refresh(battery);
1080 acpi_battery_update(battery, false);
1081 acpi_bus_generate_netlink_event(ACPI_BATTERY_CLASS,
1082 dev_name(&device->dev), event,
1083 acpi_battery_present(battery));
1084 acpi_notifier_call_chain(ACPI_BATTERY_CLASS, acpi_device_bid(device),
1085 event, acpi_battery_present(battery));
1086 /* acpi_battery_update could remove power_supply object */
1087 if (old && battery->bat)
1088 power_supply_changed(battery->bat);
1089 }
1090
battery_notify(struct notifier_block * nb,unsigned long mode,void * _unused)1091 static int battery_notify(struct notifier_block *nb,
1092 unsigned long mode, void *_unused)
1093 {
1094 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1095 pm_nb);
1096
1097 if (mode == PM_POST_SUSPEND || mode == PM_POST_HIBERNATION) {
1098 guard(mutex)(&battery->update_lock);
1099
1100 if (!acpi_battery_present(battery))
1101 return 0;
1102
1103 if (battery->bat) {
1104 acpi_battery_refresh(battery);
1105 } else {
1106 int result;
1107
1108 result = acpi_battery_get_info(battery);
1109 if (result)
1110 return result;
1111
1112 result = sysfs_add_battery(battery);
1113 if (result)
1114 return result;
1115 }
1116
1117 acpi_battery_init_alarm(battery);
1118 acpi_battery_get_state(battery);
1119 }
1120
1121 return 0;
1122 }
1123
1124 static int __init
battery_bix_broken_package_quirk(const struct dmi_system_id * d)1125 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1126 {
1127 battery_bix_broken_package = 1;
1128 return 0;
1129 }
1130
1131 static int __init
battery_notification_delay_quirk(const struct dmi_system_id * d)1132 battery_notification_delay_quirk(const struct dmi_system_id *d)
1133 {
1134 battery_notification_delay_ms = 1000;
1135 return 0;
1136 }
1137
1138 static int __init
battery_ac_is_broken_quirk(const struct dmi_system_id * d)1139 battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1140 {
1141 battery_ac_is_broken = 1;
1142 return 0;
1143 }
1144
1145 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1146 {
1147 /* NEC LZ750/LS */
1148 .callback = battery_bix_broken_package_quirk,
1149 .matches = {
1150 DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1151 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1152 },
1153 },
1154 {
1155 /* Acer Aspire V5-573G */
1156 .callback = battery_notification_delay_quirk,
1157 .matches = {
1158 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1159 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1160 },
1161 },
1162 {
1163 /* Point of View mobii wintab p800w */
1164 .callback = battery_ac_is_broken_quirk,
1165 .matches = {
1166 DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1167 DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1168 DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1169 /* Above matches are too generic, add bios-date match */
1170 DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1171 },
1172 },
1173 {
1174 /* Microsoft Surface Go 3 */
1175 .callback = battery_notification_delay_quirk,
1176 .matches = {
1177 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1178 DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3"),
1179 },
1180 },
1181 {},
1182 };
1183
1184 /*
1185 * Some machines'(E,G Lenovo Z480) ECs are not stable
1186 * during boot up and this causes battery driver fails to be
1187 * probed due to failure of getting battery information
1188 * from EC sometimes. After several retries, the operation
1189 * may work. So add retry code here and 20ms sleep between
1190 * every retries.
1191 */
acpi_battery_update_retry(struct acpi_battery * battery)1192 static int acpi_battery_update_retry(struct acpi_battery *battery)
1193 {
1194 int retry, ret;
1195
1196 guard(mutex)(&battery->update_lock);
1197
1198 for (retry = 5; retry; retry--) {
1199 ret = acpi_battery_update(battery, false);
1200 if (!ret)
1201 break;
1202
1203 msleep(20);
1204 }
1205 return ret;
1206 }
1207
sysfs_battery_cleanup(struct acpi_battery * battery)1208 static void sysfs_battery_cleanup(struct acpi_battery *battery)
1209 {
1210 guard(mutex)(&battery->update_lock);
1211
1212 sysfs_remove_battery(battery);
1213 }
1214
acpi_battery_probe(struct platform_device * pdev)1215 static int acpi_battery_probe(struct platform_device *pdev)
1216 {
1217 struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
1218 struct acpi_battery *battery;
1219 int result;
1220
1221 if (device->dep_unmet)
1222 return -EPROBE_DEFER;
1223
1224 battery = devm_kzalloc(&pdev->dev, sizeof(*battery), GFP_KERNEL);
1225 if (!battery)
1226 return -ENOMEM;
1227
1228 platform_set_drvdata(pdev, battery);
1229
1230 battery->device = device;
1231
1232 result = devm_mutex_init(&pdev->dev, &battery->update_lock);
1233 if (result)
1234 return result;
1235
1236 if (acpi_has_method(battery->device->handle, "_BIX"))
1237 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1238
1239 result = acpi_battery_update_retry(battery);
1240 if (result)
1241 goto fail;
1242
1243 pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1244 device->status.battery_present ? "present" : "absent");
1245
1246 battery->pm_nb.notifier_call = battery_notify;
1247 result = register_pm_notifier(&battery->pm_nb);
1248 if (result)
1249 goto fail;
1250
1251 device_init_wakeup(&pdev->dev, true);
1252
1253 result = acpi_dev_install_notify_handler(device, ACPI_ALL_NOTIFY,
1254 acpi_battery_notify, battery);
1255 if (result)
1256 goto fail_pm;
1257
1258 return 0;
1259
1260 fail_pm:
1261 device_init_wakeup(&pdev->dev, false);
1262 unregister_pm_notifier(&battery->pm_nb);
1263 fail:
1264 sysfs_battery_cleanup(battery);
1265
1266 return result;
1267 }
1268
acpi_battery_remove(struct platform_device * pdev)1269 static void acpi_battery_remove(struct platform_device *pdev)
1270 {
1271 struct acpi_battery *battery = platform_get_drvdata(pdev);
1272
1273 acpi_dev_remove_notify_handler(battery->device, ACPI_ALL_NOTIFY,
1274 acpi_battery_notify);
1275
1276 device_init_wakeup(&pdev->dev, false);
1277 unregister_pm_notifier(&battery->pm_nb);
1278
1279 sysfs_battery_cleanup(battery);
1280 }
1281
1282 /* this is needed to learn about changes made in suspended state */
acpi_battery_resume(struct device * dev)1283 static int acpi_battery_resume(struct device *dev)
1284 {
1285 struct acpi_battery *battery = dev_get_drvdata(dev);
1286
1287 if (!battery)
1288 return -EINVAL;
1289
1290 battery->update_time = 0;
1291
1292 guard(mutex)(&battery->update_lock);
1293
1294 acpi_battery_update(battery, true);
1295 return 0;
1296 }
1297
1298 static DEFINE_SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1299
1300 static struct platform_driver acpi_battery_driver = {
1301 .probe = acpi_battery_probe,
1302 .remove = acpi_battery_remove,
1303 .driver = {
1304 .name = "acpi-battery",
1305 .acpi_match_table = battery_device_ids,
1306 .pm = pm_sleep_ptr(&acpi_battery_pm),
1307 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1308 },
1309 };
1310
acpi_battery_init(void)1311 static int __init acpi_battery_init(void)
1312 {
1313 if (acpi_disabled || acpi_quirk_skip_acpi_ac_and_battery())
1314 return -ENODEV;
1315
1316 dmi_check_system(bat_dmi_table);
1317
1318 return platform_driver_register(&acpi_battery_driver);
1319 }
1320
acpi_battery_exit(void)1321 static void __exit acpi_battery_exit(void)
1322 {
1323 platform_driver_unregister(&acpi_battery_driver);
1324 battery_hook_exit();
1325 }
1326
1327 module_init(acpi_battery_init);
1328 module_exit(acpi_battery_exit);
1329