xref: /openbmc/linux/drivers/acpi/battery.c (revision 48b71a9e)
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/async.h>
14 #include <linux/delay.h>
15 #include <linux/dmi.h>
16 #include <linux/jiffies.h>
17 #include <linux/kernel.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
20 #include <linux/mutex.h>
21 #include <linux/slab.h>
22 #include <linux/suspend.h>
23 #include <linux/types.h>
24 
25 #include <asm/unaligned.h>
26 
27 #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 
45 MODULE_AUTHOR("Paul Diefenbaugh");
46 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
47 MODULE_DESCRIPTION("ACPI Battery Driver");
48 MODULE_LICENSE("GPL");
49 
50 static async_cookie_t async_cookie;
51 static bool battery_driver_registered;
52 static int battery_bix_broken_package;
53 static int battery_notification_delay_ms;
54 static int battery_ac_is_broken;
55 static int battery_check_pmic = 1;
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 	{"", 0},
63 };
64 
65 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
66 
67 /* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
68 static const char * const acpi_battery_blacklist[] = {
69 	"INT33F4", /* X-Powers AXP288 PMIC */
70 };
71 
72 enum {
73 	ACPI_BATTERY_ALARM_PRESENT,
74 	ACPI_BATTERY_XINFO_PRESENT,
75 	ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
76 	/* On Lenovo Thinkpad models from 2010 and 2011, the power unit
77 	 * switches between mWh and mAh depending on whether the system
78 	 * is running on battery or not.  When mAh is the unit, most
79 	 * reported values are incorrect and need to be adjusted by
80 	 * 10000/design_voltage.  Verified on x201, t410, t410s, and x220.
81 	 * Pre-2010 and 2012 models appear to always report in mWh and
82 	 * are thus unaffected (tested with t42, t61, t500, x200, x300,
83 	 * and x230).  Also, in mid-2012 Lenovo issued a BIOS update for
84 	 *  the 2011 models that fixes the issue (tested on x220 with a
85 	 * post-1.29 BIOS), but as of Nov. 2012, no such update is
86 	 * available for the 2010 models.
87 	 */
88 	ACPI_BATTERY_QUIRK_THINKPAD_MAH,
89 	/* for batteries reporting current capacity with design capacity
90 	 * on a full charge, but showing degradation in full charge cap.
91 	 */
92 	ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE,
93 };
94 
95 struct acpi_battery {
96 	struct mutex lock;
97 	struct mutex sysfs_lock;
98 	struct power_supply *bat;
99 	struct power_supply_desc bat_desc;
100 	struct acpi_device *device;
101 	struct notifier_block pm_nb;
102 	struct list_head list;
103 	unsigned long update_time;
104 	int revision;
105 	int rate_now;
106 	int capacity_now;
107 	int voltage_now;
108 	int design_capacity;
109 	int full_charge_capacity;
110 	int technology;
111 	int design_voltage;
112 	int design_capacity_warning;
113 	int design_capacity_low;
114 	int cycle_count;
115 	int measurement_accuracy;
116 	int max_sampling_time;
117 	int min_sampling_time;
118 	int max_averaging_interval;
119 	int min_averaging_interval;
120 	int capacity_granularity_1;
121 	int capacity_granularity_2;
122 	int alarm;
123 	char model_number[32];
124 	char serial_number[32];
125 	char type[32];
126 	char oem_info[32];
127 	int state;
128 	int power_unit;
129 	unsigned long flags;
130 };
131 
132 #define to_acpi_battery(x) power_supply_get_drvdata(x)
133 
134 static inline int acpi_battery_present(struct acpi_battery *battery)
135 {
136 	return battery->device->status.battery_present;
137 }
138 
139 static int acpi_battery_technology(struct acpi_battery *battery)
140 {
141 	if (!strcasecmp("NiCd", battery->type))
142 		return POWER_SUPPLY_TECHNOLOGY_NiCd;
143 	if (!strcasecmp("NiMH", battery->type))
144 		return POWER_SUPPLY_TECHNOLOGY_NiMH;
145 	if (!strcasecmp("LION", battery->type))
146 		return POWER_SUPPLY_TECHNOLOGY_LION;
147 	if (!strncasecmp("LI-ION", battery->type, 6))
148 		return POWER_SUPPLY_TECHNOLOGY_LION;
149 	if (!strcasecmp("LiP", battery->type))
150 		return POWER_SUPPLY_TECHNOLOGY_LIPO;
151 	return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
152 }
153 
154 static int acpi_battery_get_state(struct acpi_battery *battery);
155 
156 static int acpi_battery_is_charged(struct acpi_battery *battery)
157 {
158 	/* charging, discharging or critical low */
159 	if (battery->state != 0)
160 		return 0;
161 
162 	/* battery not reporting charge */
163 	if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
164 	    battery->capacity_now == 0)
165 		return 0;
166 
167 	/* good batteries update full_charge as the batteries degrade */
168 	if (battery->full_charge_capacity == battery->capacity_now)
169 		return 1;
170 
171 	/* fallback to using design values for broken batteries */
172 	if (battery->design_capacity <= battery->capacity_now)
173 		return 1;
174 
175 	/* we don't do any sort of metric based on percentages */
176 	return 0;
177 }
178 
179 static bool acpi_battery_is_degraded(struct acpi_battery *battery)
180 {
181 	return ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
182 		ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity) &&
183 		battery->full_charge_capacity < battery->design_capacity;
184 }
185 
186 static int acpi_battery_handle_discharging(struct acpi_battery *battery)
187 {
188 	/*
189 	 * Some devices wrongly report discharging if the battery's charge level
190 	 * was above the device's start charging threshold atm the AC adapter
191 	 * was plugged in and the device thus did not start a new charge cycle.
192 	 */
193 	if ((battery_ac_is_broken || power_supply_is_system_supplied()) &&
194 	    battery->rate_now == 0)
195 		return POWER_SUPPLY_STATUS_NOT_CHARGING;
196 
197 	return POWER_SUPPLY_STATUS_DISCHARGING;
198 }
199 
200 static int acpi_battery_get_property(struct power_supply *psy,
201 				     enum power_supply_property psp,
202 				     union power_supply_propval *val)
203 {
204 	int full_capacity = ACPI_BATTERY_VALUE_UNKNOWN, ret = 0;
205 	struct acpi_battery *battery = to_acpi_battery(psy);
206 
207 	if (acpi_battery_present(battery)) {
208 		/* run battery update only if it is present */
209 		acpi_battery_get_state(battery);
210 	} else if (psp != POWER_SUPPLY_PROP_PRESENT)
211 		return -ENODEV;
212 	switch (psp) {
213 	case POWER_SUPPLY_PROP_STATUS:
214 		if (battery->state & ACPI_BATTERY_STATE_DISCHARGING)
215 			val->intval = acpi_battery_handle_discharging(battery);
216 		else if (battery->state & ACPI_BATTERY_STATE_CHARGING)
217 			val->intval = POWER_SUPPLY_STATUS_CHARGING;
218 		else if (acpi_battery_is_charged(battery))
219 			val->intval = POWER_SUPPLY_STATUS_FULL;
220 		else
221 			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
222 		break;
223 	case POWER_SUPPLY_PROP_PRESENT:
224 		val->intval = acpi_battery_present(battery);
225 		break;
226 	case POWER_SUPPLY_PROP_TECHNOLOGY:
227 		val->intval = acpi_battery_technology(battery);
228 		break;
229 	case POWER_SUPPLY_PROP_CYCLE_COUNT:
230 		val->intval = battery->cycle_count;
231 		break;
232 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
233 		if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
234 			ret = -ENODEV;
235 		else
236 			val->intval = battery->design_voltage * 1000;
237 		break;
238 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
239 		if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
240 			ret = -ENODEV;
241 		else
242 			val->intval = battery->voltage_now * 1000;
243 		break;
244 	case POWER_SUPPLY_PROP_CURRENT_NOW:
245 	case POWER_SUPPLY_PROP_POWER_NOW:
246 		if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
247 			ret = -ENODEV;
248 		else
249 			val->intval = battery->rate_now * 1000;
250 		break;
251 	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
252 	case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
253 		if (!ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
254 			ret = -ENODEV;
255 		else
256 			val->intval = battery->design_capacity * 1000;
257 		break;
258 	case POWER_SUPPLY_PROP_CHARGE_FULL:
259 	case POWER_SUPPLY_PROP_ENERGY_FULL:
260 		if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
261 			ret = -ENODEV;
262 		else
263 			val->intval = battery->full_charge_capacity * 1000;
264 		break;
265 	case POWER_SUPPLY_PROP_CHARGE_NOW:
266 	case POWER_SUPPLY_PROP_ENERGY_NOW:
267 		if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
268 			ret = -ENODEV;
269 		else
270 			val->intval = battery->capacity_now * 1000;
271 		break;
272 	case POWER_SUPPLY_PROP_CAPACITY:
273 		if (ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity))
274 			full_capacity = battery->full_charge_capacity;
275 		else if (ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
276 			full_capacity = battery->design_capacity;
277 
278 		if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
279 		    full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
280 			ret = -ENODEV;
281 		else
282 			val->intval = battery->capacity_now * 100/
283 					full_capacity;
284 		break;
285 	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
286 		if (battery->state & ACPI_BATTERY_STATE_CRITICAL)
287 			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
288 		else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
289 			(battery->capacity_now <= battery->alarm))
290 			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
291 		else if (acpi_battery_is_charged(battery))
292 			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
293 		else
294 			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
295 		break;
296 	case POWER_SUPPLY_PROP_MODEL_NAME:
297 		val->strval = battery->model_number;
298 		break;
299 	case POWER_SUPPLY_PROP_MANUFACTURER:
300 		val->strval = battery->oem_info;
301 		break;
302 	case POWER_SUPPLY_PROP_SERIAL_NUMBER:
303 		val->strval = battery->serial_number;
304 		break;
305 	default:
306 		ret = -EINVAL;
307 	}
308 	return ret;
309 }
310 
311 static enum power_supply_property charge_battery_props[] = {
312 	POWER_SUPPLY_PROP_STATUS,
313 	POWER_SUPPLY_PROP_PRESENT,
314 	POWER_SUPPLY_PROP_TECHNOLOGY,
315 	POWER_SUPPLY_PROP_CYCLE_COUNT,
316 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
317 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
318 	POWER_SUPPLY_PROP_CURRENT_NOW,
319 	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
320 	POWER_SUPPLY_PROP_CHARGE_FULL,
321 	POWER_SUPPLY_PROP_CHARGE_NOW,
322 	POWER_SUPPLY_PROP_CAPACITY,
323 	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
324 	POWER_SUPPLY_PROP_MODEL_NAME,
325 	POWER_SUPPLY_PROP_MANUFACTURER,
326 	POWER_SUPPLY_PROP_SERIAL_NUMBER,
327 };
328 
329 static enum power_supply_property charge_battery_full_cap_broken_props[] = {
330 	POWER_SUPPLY_PROP_STATUS,
331 	POWER_SUPPLY_PROP_PRESENT,
332 	POWER_SUPPLY_PROP_TECHNOLOGY,
333 	POWER_SUPPLY_PROP_CYCLE_COUNT,
334 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
335 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
336 	POWER_SUPPLY_PROP_CURRENT_NOW,
337 	POWER_SUPPLY_PROP_CHARGE_NOW,
338 	POWER_SUPPLY_PROP_MODEL_NAME,
339 	POWER_SUPPLY_PROP_MANUFACTURER,
340 	POWER_SUPPLY_PROP_SERIAL_NUMBER,
341 };
342 
343 static enum power_supply_property energy_battery_props[] = {
344 	POWER_SUPPLY_PROP_STATUS,
345 	POWER_SUPPLY_PROP_PRESENT,
346 	POWER_SUPPLY_PROP_TECHNOLOGY,
347 	POWER_SUPPLY_PROP_CYCLE_COUNT,
348 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
349 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
350 	POWER_SUPPLY_PROP_POWER_NOW,
351 	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
352 	POWER_SUPPLY_PROP_ENERGY_FULL,
353 	POWER_SUPPLY_PROP_ENERGY_NOW,
354 	POWER_SUPPLY_PROP_CAPACITY,
355 	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
356 	POWER_SUPPLY_PROP_MODEL_NAME,
357 	POWER_SUPPLY_PROP_MANUFACTURER,
358 	POWER_SUPPLY_PROP_SERIAL_NUMBER,
359 };
360 
361 static enum power_supply_property energy_battery_full_cap_broken_props[] = {
362 	POWER_SUPPLY_PROP_STATUS,
363 	POWER_SUPPLY_PROP_PRESENT,
364 	POWER_SUPPLY_PROP_TECHNOLOGY,
365 	POWER_SUPPLY_PROP_CYCLE_COUNT,
366 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
367 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
368 	POWER_SUPPLY_PROP_POWER_NOW,
369 	POWER_SUPPLY_PROP_ENERGY_NOW,
370 	POWER_SUPPLY_PROP_MODEL_NAME,
371 	POWER_SUPPLY_PROP_MANUFACTURER,
372 	POWER_SUPPLY_PROP_SERIAL_NUMBER,
373 };
374 
375 /* Battery Management */
376 struct acpi_offsets {
377 	size_t offset;		/* offset inside struct acpi_sbs_battery */
378 	u8 mode;		/* int or string? */
379 };
380 
381 static const struct acpi_offsets state_offsets[] = {
382 	{offsetof(struct acpi_battery, state), 0},
383 	{offsetof(struct acpi_battery, rate_now), 0},
384 	{offsetof(struct acpi_battery, capacity_now), 0},
385 	{offsetof(struct acpi_battery, voltage_now), 0},
386 };
387 
388 static const struct acpi_offsets info_offsets[] = {
389 	{offsetof(struct acpi_battery, power_unit), 0},
390 	{offsetof(struct acpi_battery, design_capacity), 0},
391 	{offsetof(struct acpi_battery, full_charge_capacity), 0},
392 	{offsetof(struct acpi_battery, technology), 0},
393 	{offsetof(struct acpi_battery, design_voltage), 0},
394 	{offsetof(struct acpi_battery, design_capacity_warning), 0},
395 	{offsetof(struct acpi_battery, design_capacity_low), 0},
396 	{offsetof(struct acpi_battery, capacity_granularity_1), 0},
397 	{offsetof(struct acpi_battery, capacity_granularity_2), 0},
398 	{offsetof(struct acpi_battery, model_number), 1},
399 	{offsetof(struct acpi_battery, serial_number), 1},
400 	{offsetof(struct acpi_battery, type), 1},
401 	{offsetof(struct acpi_battery, oem_info), 1},
402 };
403 
404 static const struct acpi_offsets extended_info_offsets[] = {
405 	{offsetof(struct acpi_battery, revision), 0},
406 	{offsetof(struct acpi_battery, power_unit), 0},
407 	{offsetof(struct acpi_battery, design_capacity), 0},
408 	{offsetof(struct acpi_battery, full_charge_capacity), 0},
409 	{offsetof(struct acpi_battery, technology), 0},
410 	{offsetof(struct acpi_battery, design_voltage), 0},
411 	{offsetof(struct acpi_battery, design_capacity_warning), 0},
412 	{offsetof(struct acpi_battery, design_capacity_low), 0},
413 	{offsetof(struct acpi_battery, cycle_count), 0},
414 	{offsetof(struct acpi_battery, measurement_accuracy), 0},
415 	{offsetof(struct acpi_battery, max_sampling_time), 0},
416 	{offsetof(struct acpi_battery, min_sampling_time), 0},
417 	{offsetof(struct acpi_battery, max_averaging_interval), 0},
418 	{offsetof(struct acpi_battery, min_averaging_interval), 0},
419 	{offsetof(struct acpi_battery, capacity_granularity_1), 0},
420 	{offsetof(struct acpi_battery, capacity_granularity_2), 0},
421 	{offsetof(struct acpi_battery, model_number), 1},
422 	{offsetof(struct acpi_battery, serial_number), 1},
423 	{offsetof(struct acpi_battery, type), 1},
424 	{offsetof(struct acpi_battery, oem_info), 1},
425 };
426 
427 static int extract_package(struct acpi_battery *battery,
428 			   union acpi_object *package,
429 			   const struct acpi_offsets *offsets, int num)
430 {
431 	int i;
432 	union acpi_object *element;
433 
434 	if (package->type != ACPI_TYPE_PACKAGE)
435 		return -EFAULT;
436 	for (i = 0; i < num; ++i) {
437 		if (package->package.count <= i)
438 			return -EFAULT;
439 		element = &package->package.elements[i];
440 		if (offsets[i].mode) {
441 			u8 *ptr = (u8 *)battery + offsets[i].offset;
442 
443 			if (element->type == ACPI_TYPE_STRING ||
444 			    element->type == ACPI_TYPE_BUFFER)
445 				strncpy(ptr, element->string.pointer, 32);
446 			else if (element->type == ACPI_TYPE_INTEGER) {
447 				strncpy(ptr, (u8 *)&element->integer.value,
448 					sizeof(u64));
449 				ptr[sizeof(u64)] = 0;
450 			} else
451 				*ptr = 0; /* don't have value */
452 		} else {
453 			int *x = (int *)((u8 *)battery + offsets[i].offset);
454 			*x = (element->type == ACPI_TYPE_INTEGER) ?
455 				element->integer.value : -1;
456 		}
457 	}
458 	return 0;
459 }
460 
461 static int acpi_battery_get_status(struct acpi_battery *battery)
462 {
463 	if (acpi_bus_get_status(battery->device)) {
464 		acpi_handle_info(battery->device->handle,
465 				 "_STA evaluation failed\n");
466 		return -ENODEV;
467 	}
468 	return 0;
469 }
470 
471 
472 static int extract_battery_info(const int use_bix,
473 			 struct acpi_battery *battery,
474 			 const struct acpi_buffer *buffer)
475 {
476 	int result = -EFAULT;
477 
478 	if (use_bix && battery_bix_broken_package)
479 		result = extract_package(battery, buffer->pointer,
480 				extended_info_offsets + 1,
481 				ARRAY_SIZE(extended_info_offsets) - 1);
482 	else if (use_bix)
483 		result = extract_package(battery, buffer->pointer,
484 				extended_info_offsets,
485 				ARRAY_SIZE(extended_info_offsets));
486 	else
487 		result = extract_package(battery, buffer->pointer,
488 				info_offsets, ARRAY_SIZE(info_offsets));
489 	if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
490 		battery->full_charge_capacity = battery->design_capacity;
491 	if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
492 	    battery->power_unit && battery->design_voltage) {
493 		battery->design_capacity = battery->design_capacity *
494 		    10000 / battery->design_voltage;
495 		battery->full_charge_capacity = battery->full_charge_capacity *
496 		    10000 / battery->design_voltage;
497 		battery->design_capacity_warning =
498 		    battery->design_capacity_warning *
499 		    10000 / battery->design_voltage;
500 		/* Curiously, design_capacity_low, unlike the rest of them,
501 		 *  is correct.
502 		 */
503 		/* capacity_granularity_* equal 1 on the systems tested, so
504 		 * it's impossible to tell if they would need an adjustment
505 		 * or not if their values were higher.
506 		 */
507 	}
508 	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
509 	    battery->capacity_now > battery->full_charge_capacity)
510 		battery->capacity_now = battery->full_charge_capacity;
511 
512 	return result;
513 }
514 
515 static int acpi_battery_get_info(struct acpi_battery *battery)
516 {
517 	const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
518 	int use_bix;
519 	int result = -ENODEV;
520 
521 	if (!acpi_battery_present(battery))
522 		return 0;
523 
524 
525 	for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) {
526 		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
527 		acpi_status status = AE_ERROR;
528 
529 		mutex_lock(&battery->lock);
530 		status = acpi_evaluate_object(battery->device->handle,
531 					      use_bix ? "_BIX":"_BIF",
532 					      NULL, &buffer);
533 		mutex_unlock(&battery->lock);
534 
535 		if (ACPI_FAILURE(status)) {
536 			acpi_handle_info(battery->device->handle,
537 					 "%s evaluation failed: %s\n",
538 					 use_bix ? "_BIX":"_BIF",
539 					 acpi_format_exception(status));
540 		} else {
541 			result = extract_battery_info(use_bix,
542 						      battery,
543 						      &buffer);
544 
545 			kfree(buffer.pointer);
546 			break;
547 		}
548 	}
549 
550 	if (!result && !use_bix && xinfo)
551 		pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n");
552 
553 	return result;
554 }
555 
556 static int acpi_battery_get_state(struct acpi_battery *battery)
557 {
558 	int result = 0;
559 	acpi_status status = 0;
560 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
561 
562 	if (!acpi_battery_present(battery))
563 		return 0;
564 
565 	if (battery->update_time &&
566 	    time_before(jiffies, battery->update_time +
567 			msecs_to_jiffies(cache_time)))
568 		return 0;
569 
570 	mutex_lock(&battery->lock);
571 	status = acpi_evaluate_object(battery->device->handle, "_BST",
572 				      NULL, &buffer);
573 	mutex_unlock(&battery->lock);
574 
575 	if (ACPI_FAILURE(status)) {
576 		acpi_handle_info(battery->device->handle,
577 				 "_BST evaluation failed: %s",
578 				 acpi_format_exception(status));
579 		return -ENODEV;
580 	}
581 
582 	result = extract_package(battery, buffer.pointer,
583 				 state_offsets, ARRAY_SIZE(state_offsets));
584 	battery->update_time = jiffies;
585 	kfree(buffer.pointer);
586 
587 	/* For buggy DSDTs that report negative 16-bit values for either
588 	 * charging or discharging current and/or report 0 as 65536
589 	 * due to bad math.
590 	 */
591 	if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
592 		battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
593 		(s16)(battery->rate_now) < 0) {
594 		battery->rate_now = abs((s16)battery->rate_now);
595 		pr_warn_once(FW_BUG "(dis)charge rate invalid.\n");
596 	}
597 
598 	if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
599 	    && battery->capacity_now >= 0 && battery->capacity_now <= 100)
600 		battery->capacity_now = (battery->capacity_now *
601 				battery->full_charge_capacity) / 100;
602 	if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) &&
603 	    battery->power_unit && battery->design_voltage) {
604 		battery->capacity_now = battery->capacity_now *
605 		    10000 / battery->design_voltage;
606 	}
607 	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) &&
608 	    battery->capacity_now > battery->full_charge_capacity)
609 		battery->capacity_now = battery->full_charge_capacity;
610 
611 	return result;
612 }
613 
614 static int acpi_battery_set_alarm(struct acpi_battery *battery)
615 {
616 	acpi_status status = 0;
617 
618 	if (!acpi_battery_present(battery) ||
619 	    !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
620 		return -ENODEV;
621 
622 	mutex_lock(&battery->lock);
623 	status = acpi_execute_simple_method(battery->device->handle, "_BTP",
624 					    battery->alarm);
625 	mutex_unlock(&battery->lock);
626 
627 	if (ACPI_FAILURE(status))
628 		return -ENODEV;
629 
630 	acpi_handle_debug(battery->device->handle, "Alarm set to %d\n",
631 			  battery->alarm);
632 
633 	return 0;
634 }
635 
636 static int acpi_battery_init_alarm(struct acpi_battery *battery)
637 {
638 	/* See if alarms are supported, and if so, set default */
639 	if (!acpi_has_method(battery->device->handle, "_BTP")) {
640 		clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
641 		return 0;
642 	}
643 	set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
644 	if (!battery->alarm)
645 		battery->alarm = battery->design_capacity_warning;
646 	return acpi_battery_set_alarm(battery);
647 }
648 
649 static ssize_t acpi_battery_alarm_show(struct device *dev,
650 					struct device_attribute *attr,
651 					char *buf)
652 {
653 	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
654 
655 	return sprintf(buf, "%d\n", battery->alarm * 1000);
656 }
657 
658 static ssize_t acpi_battery_alarm_store(struct device *dev,
659 					struct device_attribute *attr,
660 					const char *buf, size_t count)
661 {
662 	unsigned long x;
663 	struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
664 
665 	if (sscanf(buf, "%lu\n", &x) == 1)
666 		battery->alarm = x/1000;
667 	if (acpi_battery_present(battery))
668 		acpi_battery_set_alarm(battery);
669 	return count;
670 }
671 
672 static const struct device_attribute alarm_attr = {
673 	.attr = {.name = "alarm", .mode = 0644},
674 	.show = acpi_battery_alarm_show,
675 	.store = acpi_battery_alarm_store,
676 };
677 
678 /*
679  * The Battery Hooking API
680  *
681  * This API is used inside other drivers that need to expose
682  * platform-specific behaviour within the generic driver in a
683  * generic way.
684  *
685  */
686 
687 static LIST_HEAD(acpi_battery_list);
688 static LIST_HEAD(battery_hook_list);
689 static DEFINE_MUTEX(hook_mutex);
690 
691 static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
692 {
693 	struct acpi_battery *battery;
694 	/*
695 	 * In order to remove a hook, we first need to
696 	 * de-register all the batteries that are registered.
697 	 */
698 	if (lock)
699 		mutex_lock(&hook_mutex);
700 	list_for_each_entry(battery, &acpi_battery_list, list) {
701 		hook->remove_battery(battery->bat);
702 	}
703 	list_del(&hook->list);
704 	if (lock)
705 		mutex_unlock(&hook_mutex);
706 	pr_info("extension unregistered: %s\n", hook->name);
707 }
708 
709 void battery_hook_unregister(struct acpi_battery_hook *hook)
710 {
711 	__battery_hook_unregister(hook, 1);
712 }
713 EXPORT_SYMBOL_GPL(battery_hook_unregister);
714 
715 void battery_hook_register(struct acpi_battery_hook *hook)
716 {
717 	struct acpi_battery *battery;
718 
719 	mutex_lock(&hook_mutex);
720 	INIT_LIST_HEAD(&hook->list);
721 	list_add(&hook->list, &battery_hook_list);
722 	/*
723 	 * Now that the driver is registered, we need
724 	 * to notify the hook that a battery is available
725 	 * for each battery, so that the driver may add
726 	 * its attributes.
727 	 */
728 	list_for_each_entry(battery, &acpi_battery_list, list) {
729 		if (hook->add_battery(battery->bat)) {
730 			/*
731 			 * If a add-battery returns non-zero,
732 			 * the registration of the extension has failed,
733 			 * and we will not add it to the list of loaded
734 			 * hooks.
735 			 */
736 			pr_err("extension failed to load: %s", hook->name);
737 			__battery_hook_unregister(hook, 0);
738 			goto end;
739 		}
740 	}
741 	pr_info("new extension: %s\n", hook->name);
742 end:
743 	mutex_unlock(&hook_mutex);
744 }
745 EXPORT_SYMBOL_GPL(battery_hook_register);
746 
747 /*
748  * This function gets called right after the battery sysfs
749  * attributes have been added, so that the drivers that
750  * define custom sysfs attributes can add their own.
751  */
752 static void battery_hook_add_battery(struct acpi_battery *battery)
753 {
754 	struct acpi_battery_hook *hook_node, *tmp;
755 
756 	mutex_lock(&hook_mutex);
757 	INIT_LIST_HEAD(&battery->list);
758 	list_add(&battery->list, &acpi_battery_list);
759 	/*
760 	 * Since we added a new battery to the list, we need to
761 	 * iterate over the hooks and call add_battery for each
762 	 * hook that was registered. This usually happens
763 	 * when a battery gets hotplugged or initialized
764 	 * during the battery module initialization.
765 	 */
766 	list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
767 		if (hook_node->add_battery(battery->bat)) {
768 			/*
769 			 * The notification of the extensions has failed, to
770 			 * prevent further errors we will unload the extension.
771 			 */
772 			pr_err("error in extension, unloading: %s",
773 					hook_node->name);
774 			__battery_hook_unregister(hook_node, 0);
775 		}
776 	}
777 	mutex_unlock(&hook_mutex);
778 }
779 
780 static void battery_hook_remove_battery(struct acpi_battery *battery)
781 {
782 	struct acpi_battery_hook *hook;
783 
784 	mutex_lock(&hook_mutex);
785 	/*
786 	 * Before removing the hook, we need to remove all
787 	 * custom attributes from the battery.
788 	 */
789 	list_for_each_entry(hook, &battery_hook_list, list) {
790 		hook->remove_battery(battery->bat);
791 	}
792 	/* Then, just remove the battery from the list */
793 	list_del(&battery->list);
794 	mutex_unlock(&hook_mutex);
795 }
796 
797 static void __exit battery_hook_exit(void)
798 {
799 	struct acpi_battery_hook *hook;
800 	struct acpi_battery_hook *ptr;
801 	/*
802 	 * At this point, the acpi_bus_unregister_driver()
803 	 * has called remove for all batteries. We just
804 	 * need to remove the hooks.
805 	 */
806 	list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
807 		__battery_hook_unregister(hook, 1);
808 	}
809 	mutex_destroy(&hook_mutex);
810 }
811 
812 static int sysfs_add_battery(struct acpi_battery *battery)
813 {
814 	struct power_supply_config psy_cfg = { .drv_data = battery, };
815 	bool full_cap_broken = false;
816 
817 	if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) &&
818 	    !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity))
819 		full_cap_broken = true;
820 
821 	if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
822 		if (full_cap_broken) {
823 			battery->bat_desc.properties =
824 			    charge_battery_full_cap_broken_props;
825 			battery->bat_desc.num_properties =
826 			    ARRAY_SIZE(charge_battery_full_cap_broken_props);
827 		} else {
828 			battery->bat_desc.properties = charge_battery_props;
829 			battery->bat_desc.num_properties =
830 			    ARRAY_SIZE(charge_battery_props);
831 		}
832 	} else {
833 		if (full_cap_broken) {
834 			battery->bat_desc.properties =
835 			    energy_battery_full_cap_broken_props;
836 			battery->bat_desc.num_properties =
837 			    ARRAY_SIZE(energy_battery_full_cap_broken_props);
838 		} else {
839 			battery->bat_desc.properties = energy_battery_props;
840 			battery->bat_desc.num_properties =
841 			    ARRAY_SIZE(energy_battery_props);
842 		}
843 	}
844 
845 	battery->bat_desc.name = acpi_device_bid(battery->device);
846 	battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
847 	battery->bat_desc.get_property = acpi_battery_get_property;
848 
849 	battery->bat = power_supply_register_no_ws(&battery->device->dev,
850 				&battery->bat_desc, &psy_cfg);
851 
852 	if (IS_ERR(battery->bat)) {
853 		int result = PTR_ERR(battery->bat);
854 
855 		battery->bat = NULL;
856 		return result;
857 	}
858 	battery_hook_add_battery(battery);
859 	return device_create_file(&battery->bat->dev, &alarm_attr);
860 }
861 
862 static void sysfs_remove_battery(struct acpi_battery *battery)
863 {
864 	mutex_lock(&battery->sysfs_lock);
865 	if (!battery->bat) {
866 		mutex_unlock(&battery->sysfs_lock);
867 		return;
868 	}
869 	battery_hook_remove_battery(battery);
870 	device_remove_file(&battery->bat->dev, &alarm_attr);
871 	power_supply_unregister(battery->bat);
872 	battery->bat = NULL;
873 	mutex_unlock(&battery->sysfs_lock);
874 }
875 
876 static void find_battery(const struct dmi_header *dm, void *private)
877 {
878 	struct acpi_battery *battery = (struct acpi_battery *)private;
879 	/* Note: the hardcoded offsets below have been extracted from
880 	 * the source code of dmidecode.
881 	 */
882 	if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) {
883 		const u8 *dmi_data = (const u8 *)(dm + 1);
884 		int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6));
885 
886 		if (dm->length >= 18)
887 			dmi_capacity *= dmi_data[17];
888 		if (battery->design_capacity * battery->design_voltage / 1000
889 		    != dmi_capacity &&
890 		    battery->design_capacity * 10 == dmi_capacity)
891 			set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
892 				&battery->flags);
893 	}
894 }
895 
896 /*
897  * According to the ACPI spec, some kinds of primary batteries can
898  * report percentage battery remaining capacity directly to OS.
899  * In this case, it reports the Last Full Charged Capacity == 100
900  * and BatteryPresentRate == 0xFFFFFFFF.
901  *
902  * Now we found some battery reports percentage remaining capacity
903  * even if it's rechargeable.
904  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
905  *
906  * Handle this correctly so that they won't break userspace.
907  */
908 static void acpi_battery_quirks(struct acpi_battery *battery)
909 {
910 	if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
911 		return;
912 
913 	if (battery->full_charge_capacity == 100 &&
914 		battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
915 		battery->capacity_now >= 0 && battery->capacity_now <= 100) {
916 		set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
917 		battery->full_charge_capacity = battery->design_capacity;
918 		battery->capacity_now = (battery->capacity_now *
919 				battery->full_charge_capacity) / 100;
920 	}
921 
922 	if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags))
923 		return;
924 
925 	if (battery->power_unit && dmi_name_in_vendors("LENOVO")) {
926 		const char *s;
927 
928 		s = dmi_get_system_info(DMI_PRODUCT_VERSION);
929 		if (s && !strncasecmp(s, "ThinkPad", 8)) {
930 			dmi_walk(find_battery, battery);
931 			if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH,
932 				     &battery->flags) &&
933 			    battery->design_voltage) {
934 				battery->design_capacity =
935 				    battery->design_capacity *
936 				    10000 / battery->design_voltage;
937 				battery->full_charge_capacity =
938 				    battery->full_charge_capacity *
939 				    10000 / battery->design_voltage;
940 				battery->design_capacity_warning =
941 				    battery->design_capacity_warning *
942 				    10000 / battery->design_voltage;
943 				battery->capacity_now = battery->capacity_now *
944 				    10000 / battery->design_voltage;
945 			}
946 		}
947 	}
948 
949 	if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags))
950 		return;
951 
952 	if (acpi_battery_is_degraded(battery) &&
953 	    battery->capacity_now > battery->full_charge_capacity) {
954 		set_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags);
955 		battery->capacity_now = battery->full_charge_capacity;
956 	}
957 }
958 
959 static int acpi_battery_update(struct acpi_battery *battery, bool resume)
960 {
961 	int result = acpi_battery_get_status(battery);
962 
963 	if (result)
964 		return result;
965 
966 	if (!acpi_battery_present(battery)) {
967 		sysfs_remove_battery(battery);
968 		battery->update_time = 0;
969 		return 0;
970 	}
971 
972 	if (resume)
973 		return 0;
974 
975 	if (!battery->update_time) {
976 		result = acpi_battery_get_info(battery);
977 		if (result)
978 			return result;
979 		acpi_battery_init_alarm(battery);
980 	}
981 
982 	result = acpi_battery_get_state(battery);
983 	if (result)
984 		return result;
985 	acpi_battery_quirks(battery);
986 
987 	if (!battery->bat) {
988 		result = sysfs_add_battery(battery);
989 		if (result)
990 			return result;
991 	}
992 
993 	/*
994 	 * Wakeup the system if battery is critical low
995 	 * or lower than the alarm level
996 	 */
997 	if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) ||
998 	    (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) &&
999 	     (battery->capacity_now <= battery->alarm)))
1000 		acpi_pm_wakeup_event(&battery->device->dev);
1001 
1002 	return result;
1003 }
1004 
1005 static void acpi_battery_refresh(struct acpi_battery *battery)
1006 {
1007 	int power_unit;
1008 
1009 	if (!battery->bat)
1010 		return;
1011 
1012 	power_unit = battery->power_unit;
1013 
1014 	acpi_battery_get_info(battery);
1015 
1016 	if (power_unit == battery->power_unit)
1017 		return;
1018 
1019 	/* The battery has changed its reporting units. */
1020 	sysfs_remove_battery(battery);
1021 	sysfs_add_battery(battery);
1022 }
1023 
1024 /* Driver Interface */
1025 static void acpi_battery_notify(struct acpi_device *device, u32 event)
1026 {
1027 	struct acpi_battery *battery = acpi_driver_data(device);
1028 	struct power_supply *old;
1029 
1030 	if (!battery)
1031 		return;
1032 	old = battery->bat;
1033 	/*
1034 	 * On Acer Aspire V5-573G notifications are sometimes triggered too
1035 	 * early. For example, when AC is unplugged and notification is
1036 	 * triggered, battery state is still reported as "Full", and changes to
1037 	 * "Discharging" only after short delay, without any notification.
1038 	 */
1039 	if (battery_notification_delay_ms > 0)
1040 		msleep(battery_notification_delay_ms);
1041 	if (event == ACPI_BATTERY_NOTIFY_INFO)
1042 		acpi_battery_refresh(battery);
1043 	acpi_battery_update(battery, false);
1044 	acpi_bus_generate_netlink_event(device->pnp.device_class,
1045 					dev_name(&device->dev), event,
1046 					acpi_battery_present(battery));
1047 	acpi_notifier_call_chain(device, event, acpi_battery_present(battery));
1048 	/* acpi_battery_update could remove power_supply object */
1049 	if (old && battery->bat)
1050 		power_supply_changed(battery->bat);
1051 }
1052 
1053 static int battery_notify(struct notifier_block *nb,
1054 			       unsigned long mode, void *_unused)
1055 {
1056 	struct acpi_battery *battery = container_of(nb, struct acpi_battery,
1057 						    pm_nb);
1058 	int result;
1059 
1060 	switch (mode) {
1061 	case PM_POST_HIBERNATION:
1062 	case PM_POST_SUSPEND:
1063 		if (!acpi_battery_present(battery))
1064 			return 0;
1065 
1066 		if (battery->bat) {
1067 			acpi_battery_refresh(battery);
1068 		} else {
1069 			result = acpi_battery_get_info(battery);
1070 			if (result)
1071 				return result;
1072 
1073 			result = sysfs_add_battery(battery);
1074 			if (result)
1075 				return result;
1076 		}
1077 
1078 		acpi_battery_init_alarm(battery);
1079 		acpi_battery_get_state(battery);
1080 		break;
1081 	}
1082 
1083 	return 0;
1084 }
1085 
1086 static int __init
1087 battery_bix_broken_package_quirk(const struct dmi_system_id *d)
1088 {
1089 	battery_bix_broken_package = 1;
1090 	return 0;
1091 }
1092 
1093 static int __init
1094 battery_notification_delay_quirk(const struct dmi_system_id *d)
1095 {
1096 	battery_notification_delay_ms = 1000;
1097 	return 0;
1098 }
1099 
1100 static int __init
1101 battery_ac_is_broken_quirk(const struct dmi_system_id *d)
1102 {
1103 	battery_ac_is_broken = 1;
1104 	return 0;
1105 }
1106 
1107 static int __init
1108 battery_do_not_check_pmic_quirk(const struct dmi_system_id *d)
1109 {
1110 	battery_check_pmic = 0;
1111 	return 0;
1112 }
1113 
1114 static const struct dmi_system_id bat_dmi_table[] __initconst = {
1115 	{
1116 		/* NEC LZ750/LS */
1117 		.callback = battery_bix_broken_package_quirk,
1118 		.matches = {
1119 			DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
1120 			DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
1121 		},
1122 	},
1123 	{
1124 		/* Acer Aspire V5-573G */
1125 		.callback = battery_notification_delay_quirk,
1126 		.matches = {
1127 			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1128 			DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"),
1129 		},
1130 	},
1131 	{
1132 		/* Point of View mobii wintab p800w */
1133 		.callback = battery_ac_is_broken_quirk,
1134 		.matches = {
1135 			DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
1136 			DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB"),
1137 			DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
1138 			/* Above matches are too generic, add bios-date match */
1139 			DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
1140 		},
1141 	},
1142 	{
1143 		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
1144 		.callback = battery_do_not_check_pmic_quirk,
1145 		.matches = {
1146 			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
1147 		},
1148 	},
1149 	{
1150 		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
1151 		.callback = battery_do_not_check_pmic_quirk,
1152 		.matches = {
1153 			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
1154 			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
1155 			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
1156 		},
1157 	},
1158 	{},
1159 };
1160 
1161 /*
1162  * Some machines'(E,G Lenovo Z480) ECs are not stable
1163  * during boot up and this causes battery driver fails to be
1164  * probed due to failure of getting battery information
1165  * from EC sometimes. After several retries, the operation
1166  * may work. So add retry code here and 20ms sleep between
1167  * every retries.
1168  */
1169 static int acpi_battery_update_retry(struct acpi_battery *battery)
1170 {
1171 	int retry, ret;
1172 
1173 	for (retry = 5; retry; retry--) {
1174 		ret = acpi_battery_update(battery, false);
1175 		if (!ret)
1176 			break;
1177 
1178 		msleep(20);
1179 	}
1180 	return ret;
1181 }
1182 
1183 static int acpi_battery_add(struct acpi_device *device)
1184 {
1185 	int result = 0;
1186 	struct acpi_battery *battery = NULL;
1187 
1188 	if (!device)
1189 		return -EINVAL;
1190 
1191 	if (device->dep_unmet)
1192 		return -EPROBE_DEFER;
1193 
1194 	battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
1195 	if (!battery)
1196 		return -ENOMEM;
1197 	battery->device = device;
1198 	strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1199 	strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1200 	device->driver_data = battery;
1201 	mutex_init(&battery->lock);
1202 	mutex_init(&battery->sysfs_lock);
1203 	if (acpi_has_method(battery->device->handle, "_BIX"))
1204 		set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1205 
1206 	result = acpi_battery_update_retry(battery);
1207 	if (result)
1208 		goto fail;
1209 
1210 	pr_info("Slot [%s] (battery %s)\n", acpi_device_bid(device),
1211 		device->status.battery_present ? "present" : "absent");
1212 
1213 	battery->pm_nb.notifier_call = battery_notify;
1214 	register_pm_notifier(&battery->pm_nb);
1215 
1216 	device_init_wakeup(&device->dev, 1);
1217 
1218 	return result;
1219 
1220 fail:
1221 	sysfs_remove_battery(battery);
1222 	mutex_destroy(&battery->lock);
1223 	mutex_destroy(&battery->sysfs_lock);
1224 	kfree(battery);
1225 	return result;
1226 }
1227 
1228 static int acpi_battery_remove(struct acpi_device *device)
1229 {
1230 	struct acpi_battery *battery = NULL;
1231 
1232 	if (!device || !acpi_driver_data(device))
1233 		return -EINVAL;
1234 	device_init_wakeup(&device->dev, 0);
1235 	battery = acpi_driver_data(device);
1236 	unregister_pm_notifier(&battery->pm_nb);
1237 	sysfs_remove_battery(battery);
1238 	mutex_destroy(&battery->lock);
1239 	mutex_destroy(&battery->sysfs_lock);
1240 	kfree(battery);
1241 	return 0;
1242 }
1243 
1244 #ifdef CONFIG_PM_SLEEP
1245 /* this is needed to learn about changes made in suspended state */
1246 static int acpi_battery_resume(struct device *dev)
1247 {
1248 	struct acpi_battery *battery;
1249 
1250 	if (!dev)
1251 		return -EINVAL;
1252 
1253 	battery = acpi_driver_data(to_acpi_device(dev));
1254 	if (!battery)
1255 		return -EINVAL;
1256 
1257 	battery->update_time = 0;
1258 	acpi_battery_update(battery, true);
1259 	return 0;
1260 }
1261 #else
1262 #define acpi_battery_resume NULL
1263 #endif
1264 
1265 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1266 
1267 static struct acpi_driver acpi_battery_driver = {
1268 	.name = "battery",
1269 	.class = ACPI_BATTERY_CLASS,
1270 	.ids = battery_device_ids,
1271 	.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1272 	.ops = {
1273 		.add = acpi_battery_add,
1274 		.remove = acpi_battery_remove,
1275 		.notify = acpi_battery_notify,
1276 		},
1277 	.drv.pm = &acpi_battery_pm,
1278 };
1279 
1280 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1281 {
1282 	unsigned int i;
1283 	int result;
1284 
1285 	dmi_check_system(bat_dmi_table);
1286 
1287 	if (battery_check_pmic) {
1288 		for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
1289 			if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
1290 				pr_info("found native %s PMIC, not loading\n",
1291 					acpi_battery_blacklist[i]);
1292 				return;
1293 			}
1294 	}
1295 
1296 	result = acpi_bus_register_driver(&acpi_battery_driver);
1297 	battery_driver_registered = (result == 0);
1298 }
1299 
1300 static int __init acpi_battery_init(void)
1301 {
1302 	if (acpi_disabled)
1303 		return -ENODEV;
1304 
1305 	async_cookie = async_schedule(acpi_battery_init_async, NULL);
1306 	return 0;
1307 }
1308 
1309 static void __exit acpi_battery_exit(void)
1310 {
1311 	async_synchronize_cookie(async_cookie + 1);
1312 	if (battery_driver_registered) {
1313 		acpi_bus_unregister_driver(&acpi_battery_driver);
1314 		battery_hook_exit();
1315 	}
1316 }
1317 
1318 module_init(acpi_battery_init);
1319 module_exit(acpi_battery_exit);
1320