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 | #define MAX_STRING_LENGTH 64 |
46 | |
47 | MODULE_AUTHOR("Paul Diefenbaugh" ); |
48 | MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>" ); |
49 | MODULE_DESCRIPTION("ACPI Battery Driver" ); |
50 | MODULE_LICENSE("GPL" ); |
51 | |
52 | static async_cookie_t async_cookie; |
53 | static bool battery_driver_registered; |
54 | static int battery_bix_broken_package; |
55 | static int battery_notification_delay_ms; |
56 | static int battery_ac_is_broken; |
57 | static unsigned int cache_time = 1000; |
58 | module_param(cache_time, uint, 0644); |
59 | MODULE_PARM_DESC(cache_time, "cache time in milliseconds" ); |
60 | |
61 | static const struct acpi_device_id battery_device_ids[] = { |
62 | {"PNP0C0A" , 0}, |
63 | |
64 | /* Microsoft Surface Go 3 */ |
65 | {"MSHW0146" , 0}, |
66 | |
67 | {"" , 0}, |
68 | }; |
69 | |
70 | MODULE_DEVICE_TABLE(acpi, battery_device_ids); |
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[MAX_STRING_LENGTH]; |
124 | char serial_number[MAX_STRING_LENGTH]; |
125 | char type[MAX_STRING_LENGTH]; |
126 | char oem_info[MAX_STRING_LENGTH]; |
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(s1: "NiCd" , s2: battery->type)) |
142 | return POWER_SUPPLY_TECHNOLOGY_NiCd; |
143 | if (!strcasecmp(s1: "NiMH" , s2: battery->type)) |
144 | return POWER_SUPPLY_TECHNOLOGY_NiMH; |
145 | if (!strcasecmp(s1: "LION" , s2: battery->type)) |
146 | return POWER_SUPPLY_TECHNOLOGY_LION; |
147 | if (!strncasecmp(s1: "LI-ION" , s2: battery->type, n: 6)) |
148 | return POWER_SUPPLY_TECHNOLOGY_LION; |
149 | if (!strcasecmp(s1: "LiP" , s2: 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_NOT_CHARGING; |
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 (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 | u32 len = MAX_STRING_LENGTH; |
443 | |
444 | switch (element->type) { |
445 | case ACPI_TYPE_BUFFER: |
446 | if (len > element->buffer.length + 1) |
447 | len = element->buffer.length + 1; |
448 | |
449 | fallthrough; |
450 | case ACPI_TYPE_STRING: |
451 | strscpy(ptr, element->string.pointer, len); |
452 | |
453 | break; |
454 | case ACPI_TYPE_INTEGER: |
455 | strscpy(ptr, (u8 *)&element->integer.value, sizeof(u64) + 1); |
456 | |
457 | break; |
458 | default: |
459 | *ptr = 0; /* don't have value */ |
460 | } |
461 | } else { |
462 | int *x = (int *)((u8 *)battery + offsets[i].offset); |
463 | *x = (element->type == ACPI_TYPE_INTEGER) ? |
464 | element->integer.value : -1; |
465 | } |
466 | } |
467 | return 0; |
468 | } |
469 | |
470 | static int acpi_battery_get_status(struct acpi_battery *battery) |
471 | { |
472 | if (acpi_bus_get_status(device: battery->device)) { |
473 | acpi_handle_info(battery->device->handle, |
474 | "_STA evaluation failed\n" ); |
475 | return -ENODEV; |
476 | } |
477 | return 0; |
478 | } |
479 | |
480 | |
481 | static int (const int use_bix, |
482 | struct acpi_battery *battery, |
483 | const struct acpi_buffer *buffer) |
484 | { |
485 | int result = -EFAULT; |
486 | |
487 | if (use_bix && battery_bix_broken_package) |
488 | result = extract_package(battery, package: buffer->pointer, |
489 | offsets: extended_info_offsets + 1, |
490 | ARRAY_SIZE(extended_info_offsets) - 1); |
491 | else if (use_bix) |
492 | result = extract_package(battery, package: buffer->pointer, |
493 | offsets: extended_info_offsets, |
494 | ARRAY_SIZE(extended_info_offsets)); |
495 | else |
496 | result = extract_package(battery, package: buffer->pointer, |
497 | offsets: info_offsets, ARRAY_SIZE(info_offsets)); |
498 | if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) |
499 | battery->full_charge_capacity = battery->design_capacity; |
500 | if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && |
501 | battery->power_unit && battery->design_voltage) { |
502 | battery->design_capacity = battery->design_capacity * |
503 | 10000 / battery->design_voltage; |
504 | battery->full_charge_capacity = battery->full_charge_capacity * |
505 | 10000 / battery->design_voltage; |
506 | battery->design_capacity_warning = |
507 | battery->design_capacity_warning * |
508 | 10000 / battery->design_voltage; |
509 | /* Curiously, design_capacity_low, unlike the rest of them, |
510 | * is correct. |
511 | */ |
512 | /* capacity_granularity_* equal 1 on the systems tested, so |
513 | * it's impossible to tell if they would need an adjustment |
514 | * or not if their values were higher. |
515 | */ |
516 | } |
517 | if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags) && |
518 | battery->capacity_now > battery->full_charge_capacity) |
519 | battery->capacity_now = battery->full_charge_capacity; |
520 | |
521 | return result; |
522 | } |
523 | |
524 | static int acpi_battery_get_info(struct acpi_battery *battery) |
525 | { |
526 | const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); |
527 | int use_bix; |
528 | int result = -ENODEV; |
529 | |
530 | if (!acpi_battery_present(battery)) |
531 | return 0; |
532 | |
533 | |
534 | for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { |
535 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
536 | acpi_status status = AE_ERROR; |
537 | |
538 | mutex_lock(&battery->lock); |
539 | status = acpi_evaluate_object(object: battery->device->handle, |
540 | pathname: use_bix ? "_BIX" :"_BIF" , |
541 | NULL, return_object_buffer: &buffer); |
542 | mutex_unlock(lock: &battery->lock); |
543 | |
544 | if (ACPI_FAILURE(status)) { |
545 | acpi_handle_info(battery->device->handle, |
546 | "%s evaluation failed: %s\n" , |
547 | use_bix ? "_BIX" :"_BIF" , |
548 | acpi_format_exception(status)); |
549 | } else { |
550 | result = extract_battery_info(use_bix, |
551 | battery, |
552 | buffer: &buffer); |
553 | |
554 | kfree(objp: buffer.pointer); |
555 | break; |
556 | } |
557 | } |
558 | |
559 | if (!result && !use_bix && xinfo) |
560 | pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n" ); |
561 | |
562 | return result; |
563 | } |
564 | |
565 | static int acpi_battery_get_state(struct acpi_battery *battery) |
566 | { |
567 | int result = 0; |
568 | acpi_status status = 0; |
569 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
570 | |
571 | if (!acpi_battery_present(battery)) |
572 | return 0; |
573 | |
574 | if (battery->update_time && |
575 | time_before(jiffies, battery->update_time + |
576 | msecs_to_jiffies(cache_time))) |
577 | return 0; |
578 | |
579 | mutex_lock(&battery->lock); |
580 | status = acpi_evaluate_object(object: battery->device->handle, pathname: "_BST" , |
581 | NULL, return_object_buffer: &buffer); |
582 | mutex_unlock(lock: &battery->lock); |
583 | |
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, package: buffer.pointer, |
592 | offsets: state_offsets, ARRAY_SIZE(state_offsets)); |
593 | battery->update_time = jiffies; |
594 | kfree(objp: 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 | |
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 | mutex_lock(&battery->lock); |
632 | status = acpi_execute_simple_method(handle: battery->device->handle, method: "_BTP" , |
633 | arg: battery->alarm); |
634 | mutex_unlock(lock: &battery->lock); |
635 | |
636 | if (ACPI_FAILURE(status)) |
637 | return -ENODEV; |
638 | |
639 | acpi_handle_debug(battery->device->handle, "Alarm set to %d\n" , |
640 | battery->alarm); |
641 | |
642 | return 0; |
643 | } |
644 | |
645 | static int acpi_battery_init_alarm(struct acpi_battery *battery) |
646 | { |
647 | /* See if alarms are supported, and if so, set default */ |
648 | if (!acpi_has_method(handle: battery->device->handle, name: "_BTP" )) { |
649 | clear_bit(nr: ACPI_BATTERY_ALARM_PRESENT, addr: &battery->flags); |
650 | return 0; |
651 | } |
652 | set_bit(nr: ACPI_BATTERY_ALARM_PRESENT, addr: &battery->flags); |
653 | if (!battery->alarm) |
654 | battery->alarm = battery->design_capacity_warning; |
655 | return acpi_battery_set_alarm(battery); |
656 | } |
657 | |
658 | static ssize_t acpi_battery_alarm_show(struct device *dev, |
659 | struct device_attribute *attr, |
660 | char *buf) |
661 | { |
662 | struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); |
663 | |
664 | return sprintf(buf, fmt: "%d\n" , battery->alarm * 1000); |
665 | } |
666 | |
667 | static ssize_t acpi_battery_alarm_store(struct device *dev, |
668 | struct device_attribute *attr, |
669 | const char *buf, size_t count) |
670 | { |
671 | unsigned long x; |
672 | struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); |
673 | |
674 | if (sscanf(buf, "%lu\n" , &x) == 1) |
675 | battery->alarm = x/1000; |
676 | if (acpi_battery_present(battery)) |
677 | acpi_battery_set_alarm(battery); |
678 | return count; |
679 | } |
680 | |
681 | static const struct device_attribute alarm_attr = { |
682 | .attr = {.name = "alarm" , .mode = 0644}, |
683 | .show = acpi_battery_alarm_show, |
684 | .store = acpi_battery_alarm_store, |
685 | }; |
686 | |
687 | /* |
688 | * The Battery Hooking API |
689 | * |
690 | * This API is used inside other drivers that need to expose |
691 | * platform-specific behaviour within the generic driver in a |
692 | * generic way. |
693 | * |
694 | */ |
695 | |
696 | static LIST_HEAD(acpi_battery_list); |
697 | static LIST_HEAD(battery_hook_list); |
698 | static DEFINE_MUTEX(hook_mutex); |
699 | |
700 | static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock) |
701 | { |
702 | struct acpi_battery *battery; |
703 | /* |
704 | * In order to remove a hook, we first need to |
705 | * de-register all the batteries that are registered. |
706 | */ |
707 | if (lock) |
708 | mutex_lock(&hook_mutex); |
709 | list_for_each_entry(battery, &acpi_battery_list, list) { |
710 | if (!hook->remove_battery(battery->bat, hook)) |
711 | power_supply_changed(psy: battery->bat); |
712 | } |
713 | list_del(entry: &hook->list); |
714 | if (lock) |
715 | mutex_unlock(lock: &hook_mutex); |
716 | pr_info("extension unregistered: %s\n" , hook->name); |
717 | } |
718 | |
719 | void battery_hook_unregister(struct acpi_battery_hook *hook) |
720 | { |
721 | __battery_hook_unregister(hook, lock: 1); |
722 | } |
723 | EXPORT_SYMBOL_GPL(battery_hook_unregister); |
724 | |
725 | void battery_hook_register(struct acpi_battery_hook *hook) |
726 | { |
727 | struct acpi_battery *battery; |
728 | |
729 | mutex_lock(&hook_mutex); |
730 | INIT_LIST_HEAD(list: &hook->list); |
731 | list_add(new: &hook->list, head: &battery_hook_list); |
732 | /* |
733 | * Now that the driver is registered, we need |
734 | * to notify the hook that a battery is available |
735 | * for each battery, so that the driver may add |
736 | * its attributes. |
737 | */ |
738 | list_for_each_entry(battery, &acpi_battery_list, list) { |
739 | if (hook->add_battery(battery->bat, hook)) { |
740 | /* |
741 | * If a add-battery returns non-zero, |
742 | * the registration of the extension has failed, |
743 | * and we will not add it to the list of loaded |
744 | * hooks. |
745 | */ |
746 | pr_err("extension failed to load: %s" , hook->name); |
747 | __battery_hook_unregister(hook, lock: 0); |
748 | goto end; |
749 | } |
750 | |
751 | power_supply_changed(psy: battery->bat); |
752 | } |
753 | pr_info("new extension: %s\n" , hook->name); |
754 | end: |
755 | mutex_unlock(lock: &hook_mutex); |
756 | } |
757 | EXPORT_SYMBOL_GPL(battery_hook_register); |
758 | |
759 | /* |
760 | * This function gets called right after the battery sysfs |
761 | * attributes have been added, so that the drivers that |
762 | * define custom sysfs attributes can add their own. |
763 | */ |
764 | static void battery_hook_add_battery(struct acpi_battery *battery) |
765 | { |
766 | struct acpi_battery_hook *hook_node, *tmp; |
767 | |
768 | mutex_lock(&hook_mutex); |
769 | INIT_LIST_HEAD(list: &battery->list); |
770 | list_add(new: &battery->list, head: &acpi_battery_list); |
771 | /* |
772 | * Since we added a new battery to the list, we need to |
773 | * iterate over the hooks and call add_battery for each |
774 | * hook that was registered. This usually happens |
775 | * when a battery gets hotplugged or initialized |
776 | * during the battery module initialization. |
777 | */ |
778 | list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) { |
779 | if (hook_node->add_battery(battery->bat, hook_node)) { |
780 | /* |
781 | * The notification of the extensions has failed, to |
782 | * prevent further errors we will unload the extension. |
783 | */ |
784 | pr_err("error in extension, unloading: %s" , |
785 | hook_node->name); |
786 | __battery_hook_unregister(hook: hook_node, lock: 0); |
787 | } |
788 | } |
789 | mutex_unlock(lock: &hook_mutex); |
790 | } |
791 | |
792 | static void battery_hook_remove_battery(struct acpi_battery *battery) |
793 | { |
794 | struct acpi_battery_hook *hook; |
795 | |
796 | mutex_lock(&hook_mutex); |
797 | /* |
798 | * Before removing the hook, we need to remove all |
799 | * custom attributes from the battery. |
800 | */ |
801 | list_for_each_entry(hook, &battery_hook_list, list) { |
802 | hook->remove_battery(battery->bat, hook); |
803 | } |
804 | /* Then, just remove the battery from the list */ |
805 | list_del(entry: &battery->list); |
806 | mutex_unlock(lock: &hook_mutex); |
807 | } |
808 | |
809 | static void __exit battery_hook_exit(void) |
810 | { |
811 | struct acpi_battery_hook *hook; |
812 | struct acpi_battery_hook *ptr; |
813 | /* |
814 | * At this point, the acpi_bus_unregister_driver() |
815 | * has called remove for all batteries. We just |
816 | * need to remove the hooks. |
817 | */ |
818 | list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) { |
819 | __battery_hook_unregister(hook, lock: 1); |
820 | } |
821 | mutex_destroy(lock: &hook_mutex); |
822 | } |
823 | |
824 | static int sysfs_add_battery(struct acpi_battery *battery) |
825 | { |
826 | struct power_supply_config psy_cfg = { .drv_data = battery, }; |
827 | bool full_cap_broken = false; |
828 | |
829 | if (!ACPI_BATTERY_CAPACITY_VALID(battery->full_charge_capacity) && |
830 | !ACPI_BATTERY_CAPACITY_VALID(battery->design_capacity)) |
831 | full_cap_broken = true; |
832 | |
833 | if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { |
834 | if (full_cap_broken) { |
835 | battery->bat_desc.properties = |
836 | charge_battery_full_cap_broken_props; |
837 | battery->bat_desc.num_properties = |
838 | ARRAY_SIZE(charge_battery_full_cap_broken_props); |
839 | } else { |
840 | battery->bat_desc.properties = charge_battery_props; |
841 | battery->bat_desc.num_properties = |
842 | ARRAY_SIZE(charge_battery_props); |
843 | } |
844 | } else { |
845 | if (full_cap_broken) { |
846 | battery->bat_desc.properties = |
847 | energy_battery_full_cap_broken_props; |
848 | battery->bat_desc.num_properties = |
849 | ARRAY_SIZE(energy_battery_full_cap_broken_props); |
850 | } else { |
851 | battery->bat_desc.properties = energy_battery_props; |
852 | battery->bat_desc.num_properties = |
853 | ARRAY_SIZE(energy_battery_props); |
854 | } |
855 | } |
856 | |
857 | battery->bat_desc.name = acpi_device_bid(battery->device); |
858 | battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; |
859 | battery->bat_desc.get_property = acpi_battery_get_property; |
860 | |
861 | battery->bat = power_supply_register_no_ws(parent: &battery->device->dev, |
862 | desc: &battery->bat_desc, cfg: &psy_cfg); |
863 | |
864 | if (IS_ERR(ptr: battery->bat)) { |
865 | int result = PTR_ERR(ptr: battery->bat); |
866 | |
867 | battery->bat = NULL; |
868 | return result; |
869 | } |
870 | battery_hook_add_battery(battery); |
871 | return device_create_file(device: &battery->bat->dev, entry: &alarm_attr); |
872 | } |
873 | |
874 | static void sysfs_remove_battery(struct acpi_battery *battery) |
875 | { |
876 | mutex_lock(&battery->sysfs_lock); |
877 | if (!battery->bat) { |
878 | mutex_unlock(lock: &battery->sysfs_lock); |
879 | return; |
880 | } |
881 | battery_hook_remove_battery(battery); |
882 | device_remove_file(dev: &battery->bat->dev, attr: &alarm_attr); |
883 | power_supply_unregister(psy: battery->bat); |
884 | battery->bat = NULL; |
885 | mutex_unlock(lock: &battery->sysfs_lock); |
886 | } |
887 | |
888 | static void find_battery(const struct dmi_header *dm, void *private) |
889 | { |
890 | struct acpi_battery *battery = (struct acpi_battery *)private; |
891 | /* Note: the hardcoded offsets below have been extracted from |
892 | * the source code of dmidecode. |
893 | */ |
894 | if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { |
895 | const u8 *dmi_data = (const u8 *)(dm + 1); |
896 | int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); |
897 | |
898 | if (dm->length >= 18) |
899 | dmi_capacity *= dmi_data[17]; |
900 | if (battery->design_capacity * battery->design_voltage / 1000 |
901 | != dmi_capacity && |
902 | battery->design_capacity * 10 == dmi_capacity) |
903 | set_bit(nr: ACPI_BATTERY_QUIRK_THINKPAD_MAH, |
904 | addr: &battery->flags); |
905 | } |
906 | } |
907 | |
908 | /* |
909 | * According to the ACPI spec, some kinds of primary batteries can |
910 | * report percentage battery remaining capacity directly to OS. |
911 | * In this case, it reports the Last Full Charged Capacity == 100 |
912 | * and BatteryPresentRate == 0xFFFFFFFF. |
913 | * |
914 | * Now we found some battery reports percentage remaining capacity |
915 | * even if it's rechargeable. |
916 | * https://bugzilla.kernel.org/show_bug.cgi?id=15979 |
917 | * |
918 | * Handle this correctly so that they won't break userspace. |
919 | */ |
920 | static void acpi_battery_quirks(struct acpi_battery *battery) |
921 | { |
922 | if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) |
923 | return; |
924 | |
925 | if (battery->full_charge_capacity == 100 && |
926 | battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && |
927 | battery->capacity_now >= 0 && battery->capacity_now <= 100) { |
928 | set_bit(nr: ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, addr: &battery->flags); |
929 | battery->full_charge_capacity = battery->design_capacity; |
930 | battery->capacity_now = (battery->capacity_now * |
931 | battery->full_charge_capacity) / 100; |
932 | } |
933 | |
934 | if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) |
935 | return; |
936 | |
937 | if (battery->power_unit && dmi_name_in_vendors(str: "LENOVO" )) { |
938 | const char *s; |
939 | |
940 | s = dmi_get_system_info(field: DMI_PRODUCT_VERSION); |
941 | if (s && !strncasecmp(s1: s, s2: "ThinkPad" , n: 8)) { |
942 | dmi_walk(decode: find_battery, private_data: battery); |
943 | if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, |
944 | &battery->flags) && |
945 | battery->design_voltage) { |
946 | battery->design_capacity = |
947 | battery->design_capacity * |
948 | 10000 / battery->design_voltage; |
949 | battery->full_charge_capacity = |
950 | battery->full_charge_capacity * |
951 | 10000 / battery->design_voltage; |
952 | battery->design_capacity_warning = |
953 | battery->design_capacity_warning * |
954 | 10000 / battery->design_voltage; |
955 | battery->capacity_now = battery->capacity_now * |
956 | 10000 / battery->design_voltage; |
957 | } |
958 | } |
959 | } |
960 | |
961 | if (test_bit(ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, &battery->flags)) |
962 | return; |
963 | |
964 | if (acpi_battery_is_degraded(battery) && |
965 | battery->capacity_now > battery->full_charge_capacity) { |
966 | set_bit(nr: ACPI_BATTERY_QUIRK_DEGRADED_FULL_CHARGE, addr: &battery->flags); |
967 | battery->capacity_now = battery->full_charge_capacity; |
968 | } |
969 | } |
970 | |
971 | static int acpi_battery_update(struct acpi_battery *battery, bool resume) |
972 | { |
973 | int result = acpi_battery_get_status(battery); |
974 | |
975 | if (result) |
976 | return result; |
977 | |
978 | if (!acpi_battery_present(battery)) { |
979 | sysfs_remove_battery(battery); |
980 | battery->update_time = 0; |
981 | return 0; |
982 | } |
983 | |
984 | if (resume) |
985 | return 0; |
986 | |
987 | if (!battery->update_time) { |
988 | result = acpi_battery_get_info(battery); |
989 | if (result) |
990 | return result; |
991 | acpi_battery_init_alarm(battery); |
992 | } |
993 | |
994 | result = acpi_battery_get_state(battery); |
995 | if (result) |
996 | return result; |
997 | acpi_battery_quirks(battery); |
998 | |
999 | if (!battery->bat) { |
1000 | result = sysfs_add_battery(battery); |
1001 | if (result) |
1002 | return result; |
1003 | } |
1004 | |
1005 | /* |
1006 | * Wakeup the system if battery is critical low |
1007 | * or lower than the alarm level |
1008 | */ |
1009 | if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || |
1010 | (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && |
1011 | (battery->capacity_now <= battery->alarm))) |
1012 | acpi_pm_wakeup_event(dev: &battery->device->dev); |
1013 | |
1014 | return result; |
1015 | } |
1016 | |
1017 | static void acpi_battery_refresh(struct acpi_battery *battery) |
1018 | { |
1019 | int power_unit; |
1020 | |
1021 | if (!battery->bat) |
1022 | return; |
1023 | |
1024 | power_unit = battery->power_unit; |
1025 | |
1026 | acpi_battery_get_info(battery); |
1027 | |
1028 | if (power_unit == battery->power_unit) |
1029 | return; |
1030 | |
1031 | /* The battery has changed its reporting units. */ |
1032 | sysfs_remove_battery(battery); |
1033 | sysfs_add_battery(battery); |
1034 | } |
1035 | |
1036 | /* Driver Interface */ |
1037 | static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) |
1038 | { |
1039 | struct acpi_device *device = data; |
1040 | struct acpi_battery *battery = acpi_driver_data(d: device); |
1041 | struct power_supply *old; |
1042 | |
1043 | if (!battery) |
1044 | return; |
1045 | old = battery->bat; |
1046 | /* |
1047 | * On Acer Aspire V5-573G notifications are sometimes triggered too |
1048 | * early. For example, when AC is unplugged and notification is |
1049 | * triggered, battery state is still reported as "Full", and changes to |
1050 | * "Discharging" only after short delay, without any notification. |
1051 | */ |
1052 | if (battery_notification_delay_ms > 0) |
1053 | msleep(msecs: battery_notification_delay_ms); |
1054 | if (event == ACPI_BATTERY_NOTIFY_INFO) |
1055 | acpi_battery_refresh(battery); |
1056 | acpi_battery_update(battery, resume: false); |
1057 | acpi_bus_generate_netlink_event(device->pnp.device_class, |
1058 | dev_name(dev: &device->dev), event, |
1059 | acpi_battery_present(battery)); |
1060 | acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); |
1061 | /* acpi_battery_update could remove power_supply object */ |
1062 | if (old && battery->bat) |
1063 | power_supply_changed(psy: battery->bat); |
1064 | } |
1065 | |
1066 | static int battery_notify(struct notifier_block *nb, |
1067 | unsigned long mode, void *_unused) |
1068 | { |
1069 | struct acpi_battery *battery = container_of(nb, struct acpi_battery, |
1070 | pm_nb); |
1071 | int result; |
1072 | |
1073 | switch (mode) { |
1074 | case PM_POST_HIBERNATION: |
1075 | case PM_POST_SUSPEND: |
1076 | if (!acpi_battery_present(battery)) |
1077 | return 0; |
1078 | |
1079 | if (battery->bat) { |
1080 | acpi_battery_refresh(battery); |
1081 | } else { |
1082 | result = acpi_battery_get_info(battery); |
1083 | if (result) |
1084 | return result; |
1085 | |
1086 | result = sysfs_add_battery(battery); |
1087 | if (result) |
1088 | return result; |
1089 | } |
1090 | |
1091 | acpi_battery_init_alarm(battery); |
1092 | acpi_battery_get_state(battery); |
1093 | break; |
1094 | } |
1095 | |
1096 | return 0; |
1097 | } |
1098 | |
1099 | static int __init |
1100 | battery_bix_broken_package_quirk(const struct dmi_system_id *d) |
1101 | { |
1102 | battery_bix_broken_package = 1; |
1103 | return 0; |
1104 | } |
1105 | |
1106 | static int __init |
1107 | battery_notification_delay_quirk(const struct dmi_system_id *d) |
1108 | { |
1109 | battery_notification_delay_ms = 1000; |
1110 | return 0; |
1111 | } |
1112 | |
1113 | static int __init |
1114 | battery_ac_is_broken_quirk(const struct dmi_system_id *d) |
1115 | { |
1116 | battery_ac_is_broken = 1; |
1117 | return 0; |
1118 | } |
1119 | |
1120 | static const struct dmi_system_id bat_dmi_table[] __initconst = { |
1121 | { |
1122 | /* NEC LZ750/LS */ |
1123 | .callback = battery_bix_broken_package_quirk, |
1124 | .matches = { |
1125 | DMI_MATCH(DMI_SYS_VENDOR, "NEC" ), |
1126 | DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS" ), |
1127 | }, |
1128 | }, |
1129 | { |
1130 | /* Acer Aspire V5-573G */ |
1131 | .callback = battery_notification_delay_quirk, |
1132 | .matches = { |
1133 | DMI_MATCH(DMI_SYS_VENDOR, "Acer" ), |
1134 | DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G" ), |
1135 | }, |
1136 | }, |
1137 | { |
1138 | /* Point of View mobii wintab p800w */ |
1139 | .callback = battery_ac_is_broken_quirk, |
1140 | .matches = { |
1141 | DMI_MATCH(DMI_BOARD_VENDOR, "AMI Corporation" ), |
1142 | DMI_MATCH(DMI_BOARD_NAME, "Aptio CRB" ), |
1143 | DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013" ), |
1144 | /* Above matches are too generic, add bios-date match */ |
1145 | DMI_MATCH(DMI_BIOS_DATE, "08/22/2014" ), |
1146 | }, |
1147 | }, |
1148 | { |
1149 | /* Microsoft Surface Go 3 */ |
1150 | .callback = battery_notification_delay_quirk, |
1151 | .matches = { |
1152 | DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation" ), |
1153 | DMI_MATCH(DMI_PRODUCT_NAME, "Surface Go 3" ), |
1154 | }, |
1155 | }, |
1156 | {}, |
1157 | }; |
1158 | |
1159 | /* |
1160 | * Some machines'(E,G Lenovo Z480) ECs are not stable |
1161 | * during boot up and this causes battery driver fails to be |
1162 | * probed due to failure of getting battery information |
1163 | * from EC sometimes. After several retries, the operation |
1164 | * may work. So add retry code here and 20ms sleep between |
1165 | * every retries. |
1166 | */ |
1167 | static int acpi_battery_update_retry(struct acpi_battery *battery) |
1168 | { |
1169 | int retry, ret; |
1170 | |
1171 | for (retry = 5; retry; retry--) { |
1172 | ret = acpi_battery_update(battery, resume: false); |
1173 | if (!ret) |
1174 | break; |
1175 | |
1176 | msleep(msecs: 20); |
1177 | } |
1178 | return ret; |
1179 | } |
1180 | |
1181 | static int acpi_battery_add(struct acpi_device *device) |
1182 | { |
1183 | int result = 0; |
1184 | struct acpi_battery *battery = NULL; |
1185 | |
1186 | if (!device) |
1187 | return -EINVAL; |
1188 | |
1189 | if (device->dep_unmet) |
1190 | return -EPROBE_DEFER; |
1191 | |
1192 | battery = kzalloc(size: sizeof(struct acpi_battery), GFP_KERNEL); |
1193 | if (!battery) |
1194 | return -ENOMEM; |
1195 | battery->device = device; |
1196 | strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); |
1197 | strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); |
1198 | device->driver_data = battery; |
1199 | mutex_init(&battery->lock); |
1200 | mutex_init(&battery->sysfs_lock); |
1201 | if (acpi_has_method(handle: battery->device->handle, name: "_BIX" )) |
1202 | set_bit(nr: ACPI_BATTERY_XINFO_PRESENT, addr: &battery->flags); |
1203 | |
1204 | result = acpi_battery_update_retry(battery); |
1205 | if (result) |
1206 | goto fail; |
1207 | |
1208 | pr_info("Slot [%s] (battery %s)\n" , acpi_device_bid(device), |
1209 | device->status.battery_present ? "present" : "absent" ); |
1210 | |
1211 | battery->pm_nb.notifier_call = battery_notify; |
1212 | register_pm_notifier(nb: &battery->pm_nb); |
1213 | |
1214 | device_init_wakeup(dev: &device->dev, enable: 1); |
1215 | |
1216 | result = acpi_dev_install_notify_handler(adev: device, ACPI_ALL_NOTIFY, |
1217 | handler: acpi_battery_notify, context: device); |
1218 | if (result) |
1219 | goto fail_pm; |
1220 | |
1221 | return 0; |
1222 | |
1223 | fail_pm: |
1224 | device_init_wakeup(dev: &device->dev, enable: 0); |
1225 | unregister_pm_notifier(nb: &battery->pm_nb); |
1226 | fail: |
1227 | sysfs_remove_battery(battery); |
1228 | mutex_destroy(lock: &battery->lock); |
1229 | mutex_destroy(lock: &battery->sysfs_lock); |
1230 | kfree(objp: battery); |
1231 | |
1232 | return result; |
1233 | } |
1234 | |
1235 | static void acpi_battery_remove(struct acpi_device *device) |
1236 | { |
1237 | struct acpi_battery *battery = NULL; |
1238 | |
1239 | if (!device || !acpi_driver_data(d: device)) |
1240 | return; |
1241 | |
1242 | battery = acpi_driver_data(d: device); |
1243 | |
1244 | acpi_dev_remove_notify_handler(adev: device, ACPI_ALL_NOTIFY, |
1245 | handler: acpi_battery_notify); |
1246 | |
1247 | device_init_wakeup(dev: &device->dev, enable: 0); |
1248 | unregister_pm_notifier(nb: &battery->pm_nb); |
1249 | sysfs_remove_battery(battery); |
1250 | |
1251 | mutex_destroy(lock: &battery->lock); |
1252 | mutex_destroy(lock: &battery->sysfs_lock); |
1253 | kfree(objp: battery); |
1254 | } |
1255 | |
1256 | #ifdef CONFIG_PM_SLEEP |
1257 | /* this is needed to learn about changes made in suspended state */ |
1258 | static int acpi_battery_resume(struct device *dev) |
1259 | { |
1260 | struct acpi_battery *battery; |
1261 | |
1262 | if (!dev) |
1263 | return -EINVAL; |
1264 | |
1265 | battery = acpi_driver_data(to_acpi_device(dev)); |
1266 | if (!battery) |
1267 | return -EINVAL; |
1268 | |
1269 | battery->update_time = 0; |
1270 | acpi_battery_update(battery, resume: true); |
1271 | return 0; |
1272 | } |
1273 | #else |
1274 | #define acpi_battery_resume NULL |
1275 | #endif |
1276 | |
1277 | static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); |
1278 | |
1279 | static struct acpi_driver acpi_battery_driver = { |
1280 | .name = "battery" , |
1281 | .class = ACPI_BATTERY_CLASS, |
1282 | .ids = battery_device_ids, |
1283 | .ops = { |
1284 | .add = acpi_battery_add, |
1285 | .remove = acpi_battery_remove, |
1286 | }, |
1287 | .drv.pm = &acpi_battery_pm, |
1288 | }; |
1289 | |
1290 | static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) |
1291 | { |
1292 | int result; |
1293 | |
1294 | if (acpi_quirk_skip_acpi_ac_and_battery()) |
1295 | return; |
1296 | |
1297 | dmi_check_system(list: bat_dmi_table); |
1298 | |
1299 | result = acpi_bus_register_driver(driver: &acpi_battery_driver); |
1300 | battery_driver_registered = (result == 0); |
1301 | } |
1302 | |
1303 | static int __init acpi_battery_init(void) |
1304 | { |
1305 | if (acpi_disabled) |
1306 | return -ENODEV; |
1307 | |
1308 | async_cookie = async_schedule(func: acpi_battery_init_async, NULL); |
1309 | return 0; |
1310 | } |
1311 | |
1312 | static void __exit acpi_battery_exit(void) |
1313 | { |
1314 | async_synchronize_cookie(cookie: async_cookie + 1); |
1315 | if (battery_driver_registered) { |
1316 | acpi_bus_unregister_driver(driver: &acpi_battery_driver); |
1317 | battery_hook_exit(); |
1318 | } |
1319 | } |
1320 | |
1321 | module_init(acpi_battery_init); |
1322 | module_exit(acpi_battery_exit); |
1323 | |