?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ACPI / Battery: remove battery refresh on resume
[wandboard.git] / drivers / acpi / battery.c
blobac1a599f5147640cc58135391260f0f202a411b1
1 /*
2 * battery.c - ACPI Battery Driver (Revision: 2.0)
3 *
4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 *
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 */
27
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/types.h>
32 #include <linux/jiffies.h>
33 #include <linux/async.h>
34 #include <linux/dmi.h>
35 #include <linux/slab.h>
36
37 #ifdef CONFIG_ACPI_PROCFS_POWER
38 #include <linux/proc_fs.h>
39 #include <linux/seq_file.h>
40 #include <asm/uaccess.h>
41 #endif
42
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
45 #include <linux/power_supply.h>
46
47 #define PREFIX "ACPI: "
48
49 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
50
51 #define ACPI_BATTERY_CLASS "battery"
52 #define ACPI_BATTERY_DEVICE_NAME "Battery"
53 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
54 #define ACPI_BATTERY_NOTIFY_INFO 0x81
55 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
56
57 #define _COMPONENT ACPI_BATTERY_COMPONENT
58
59 ACPI_MODULE_NAME("battery");
60
61 MODULE_AUTHOR("Paul Diefenbaugh");
62 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
63 MODULE_DESCRIPTION("ACPI Battery Driver");
64 MODULE_LICENSE("GPL");
65
66 static unsigned int cache_time = 1000;
67 module_param(cache_time, uint, 0644);
68 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
69
70 #ifdef CONFIG_ACPI_PROCFS_POWER
71 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
72 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
73
74 enum acpi_battery_files {
75 info_tag = 0,
76 state_tag,
77 alarm_tag,
78 ACPI_BATTERY_NUMFILES,
79 };
80
81 #endif
82
83 static const struct acpi_device_id battery_device_ids[] = {
84 {"PNP0C0A", 0},
85 {"", 0},
86 };
87
88 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
89
90 enum {
91 ACPI_BATTERY_ALARM_PRESENT,
92 ACPI_BATTERY_XINFO_PRESENT,
93 /* For buggy DSDTs that report negative 16-bit values for either
94 * charging or discharging current and/or report 0 as 65536
95 * due to bad math.
96 */
97 ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
98 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
99 };
100
101 struct acpi_battery {
102 struct mutex lock;
103 struct power_supply bat;
104 struct acpi_device *device;
105 unsigned long update_time;
106 int rate_now;
107 int capacity_now;
108 int voltage_now;
109 int design_capacity;
110 int full_charge_capacity;
111 int technology;
112 int design_voltage;
113 int design_capacity_warning;
114 int design_capacity_low;
115 int cycle_count;
116 int measurement_accuracy;
117 int max_sampling_time;
118 int min_sampling_time;
119 int max_averaging_interval;
120 int min_averaging_interval;
121 int capacity_granularity_1;
122 int capacity_granularity_2;
123 int alarm;
124 char model_number[32];
125 char serial_number[32];
126 char type[32];
127 char oem_info[32];
128 int state;
129 int power_unit;
130 unsigned long flags;
131 };
132
133 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
134
135 inline int acpi_battery_present(struct acpi_battery *battery)
136 {
137 return battery->device->status.battery_present;
138 }
139
140 static int acpi_battery_technology(struct acpi_battery *battery)
141 {
142 if (!strcasecmp("NiCd", battery->type))
143 return POWER_SUPPLY_TECHNOLOGY_NiCd;
144 if (!strcasecmp("NiMH", battery->type))
145 return POWER_SUPPLY_TECHNOLOGY_NiMH;
146 if (!strcasecmp("LION", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_LION;
148 if (!strncasecmp("LI-ION", battery->type, 6))
149 return POWER_SUPPLY_TECHNOLOGY_LION;
150 if (!strcasecmp("LiP", battery->type))
151 return POWER_SUPPLY_TECHNOLOGY_LIPO;
152 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
153 }
154
155 static int acpi_battery_get_state(struct acpi_battery *battery);
156
157 static int acpi_battery_is_charged(struct acpi_battery *battery)
158 {
159 /* either charging or discharging */
160 if (battery->state != 0)
161 return 0;
162
163 /* battery not reporting charge */
164 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
165 battery->capacity_now == 0)
166 return 0;
167
168 /* good batteries update full_charge as the batteries degrade */
169 if (battery->full_charge_capacity == battery->capacity_now)
170 return 1;
171
172 /* fallback to using design values for broken batteries */
173 if (battery->design_capacity == battery->capacity_now)
174 return 1;
175
176 /* we don't do any sort of metric based on percentages */
177 return 0;
178 }
179
180 static int acpi_battery_get_property(struct power_supply *psy,
181 enum power_supply_property psp,
182 union power_supply_propval *val)
183 {
184 int ret = 0;
185 struct acpi_battery *battery = to_acpi_battery(psy);
186
187 if (acpi_battery_present(battery)) {
188 /* run battery update only if it is present */
189 acpi_battery_get_state(battery);
190 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
191 return -ENODEV;
192 switch (psp) {
193 case POWER_SUPPLY_PROP_STATUS:
194 if (battery->state & 0x01)
195 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
196 else if (battery->state & 0x02)
197 val->intval = POWER_SUPPLY_STATUS_CHARGING;
198 else if (acpi_battery_is_charged(battery))
199 val->intval = POWER_SUPPLY_STATUS_FULL;
200 else
201 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
202 break;
203 case POWER_SUPPLY_PROP_PRESENT:
204 val->intval = acpi_battery_present(battery);
205 break;
206 case POWER_SUPPLY_PROP_TECHNOLOGY:
207 val->intval = acpi_battery_technology(battery);
208 break;
209 case POWER_SUPPLY_PROP_CYCLE_COUNT:
210 val->intval = battery->cycle_count;
211 break;
212 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
213 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
214 ret = -ENODEV;
215 else
216 val->intval = battery->design_voltage * 1000;
217 break;
218 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
219 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
220 ret = -ENODEV;
221 else
222 val->intval = battery->voltage_now * 1000;
223 break;
224 case POWER_SUPPLY_PROP_CURRENT_NOW:
225 case POWER_SUPPLY_PROP_POWER_NOW:
226 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
227 ret = -ENODEV;
228 else
229 val->intval = battery->rate_now * 1000;
230 break;
231 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
232 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
233 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
234 ret = -ENODEV;
235 else
236 val->intval = battery->design_capacity * 1000;
237 break;
238 case POWER_SUPPLY_PROP_CHARGE_FULL:
239 case POWER_SUPPLY_PROP_ENERGY_FULL:
240 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
241 ret = -ENODEV;
242 else
243 val->intval = battery->full_charge_capacity * 1000;
244 break;
245 case POWER_SUPPLY_PROP_CHARGE_NOW:
246 case POWER_SUPPLY_PROP_ENERGY_NOW:
247 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
248 ret = -ENODEV;
249 else
250 val->intval = battery->capacity_now * 1000;
251 break;
252 case POWER_SUPPLY_PROP_MODEL_NAME:
253 val->strval = battery->model_number;
254 break;
255 case POWER_SUPPLY_PROP_MANUFACTURER:
256 val->strval = battery->oem_info;
257 break;
258 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
259 val->strval = battery->serial_number;
260 break;
261 default:
262 ret = -EINVAL;
263 }
264 return ret;
265 }
266
267 static enum power_supply_property charge_battery_props[] = {
268 POWER_SUPPLY_PROP_STATUS,
269 POWER_SUPPLY_PROP_PRESENT,
270 POWER_SUPPLY_PROP_TECHNOLOGY,
271 POWER_SUPPLY_PROP_CYCLE_COUNT,
272 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
273 POWER_SUPPLY_PROP_VOLTAGE_NOW,
274 POWER_SUPPLY_PROP_CURRENT_NOW,
275 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
276 POWER_SUPPLY_PROP_CHARGE_FULL,
277 POWER_SUPPLY_PROP_CHARGE_NOW,
278 POWER_SUPPLY_PROP_MODEL_NAME,
279 POWER_SUPPLY_PROP_MANUFACTURER,
280 POWER_SUPPLY_PROP_SERIAL_NUMBER,
281 };
282
283 static enum power_supply_property energy_battery_props[] = {
284 POWER_SUPPLY_PROP_STATUS,
285 POWER_SUPPLY_PROP_PRESENT,
286 POWER_SUPPLY_PROP_TECHNOLOGY,
287 POWER_SUPPLY_PROP_CYCLE_COUNT,
288 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
289 POWER_SUPPLY_PROP_VOLTAGE_NOW,
290 POWER_SUPPLY_PROP_POWER_NOW,
291 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
292 POWER_SUPPLY_PROP_ENERGY_FULL,
293 POWER_SUPPLY_PROP_ENERGY_NOW,
294 POWER_SUPPLY_PROP_MODEL_NAME,
295 POWER_SUPPLY_PROP_MANUFACTURER,
296 POWER_SUPPLY_PROP_SERIAL_NUMBER,
297 };
298
299 #ifdef CONFIG_ACPI_PROCFS_POWER
300 inline char *acpi_battery_units(struct acpi_battery *battery)
301 {
302 return (battery->power_unit)?"mA":"mW";
303 }
304 #endif
305
306 /* --------------------------------------------------------------------------
307 Battery Management
308 -------------------------------------------------------------------------- */
309 struct acpi_offsets {
310 size_t offset; /* offset inside struct acpi_sbs_battery */
311 u8 mode; /* int or string? */
312 };
313
314 static struct acpi_offsets state_offsets[] = {
315 {offsetof(struct acpi_battery, state), 0},
316 {offsetof(struct acpi_battery, rate_now), 0},
317 {offsetof(struct acpi_battery, capacity_now), 0},
318 {offsetof(struct acpi_battery, voltage_now), 0},
319 };
320
321 static struct acpi_offsets info_offsets[] = {
322 {offsetof(struct acpi_battery, power_unit), 0},
323 {offsetof(struct acpi_battery, design_capacity), 0},
324 {offsetof(struct acpi_battery, full_charge_capacity), 0},
325 {offsetof(struct acpi_battery, technology), 0},
326 {offsetof(struct acpi_battery, design_voltage), 0},
327 {offsetof(struct acpi_battery, design_capacity_warning), 0},
328 {offsetof(struct acpi_battery, design_capacity_low), 0},
329 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
330 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
331 {offsetof(struct acpi_battery, model_number), 1},
332 {offsetof(struct acpi_battery, serial_number), 1},
333 {offsetof(struct acpi_battery, type), 1},
334 {offsetof(struct acpi_battery, oem_info), 1},
335 };
336
337 static struct acpi_offsets extended_info_offsets[] = {
338 {offsetof(struct acpi_battery, power_unit), 0},
339 {offsetof(struct acpi_battery, design_capacity), 0},
340 {offsetof(struct acpi_battery, full_charge_capacity), 0},
341 {offsetof(struct acpi_battery, technology), 0},
342 {offsetof(struct acpi_battery, design_voltage), 0},
343 {offsetof(struct acpi_battery, design_capacity_warning), 0},
344 {offsetof(struct acpi_battery, design_capacity_low), 0},
345 {offsetof(struct acpi_battery, cycle_count), 0},
346 {offsetof(struct acpi_battery, measurement_accuracy), 0},
347 {offsetof(struct acpi_battery, max_sampling_time), 0},
348 {offsetof(struct acpi_battery, min_sampling_time), 0},
349 {offsetof(struct acpi_battery, max_averaging_interval), 0},
350 {offsetof(struct acpi_battery, min_averaging_interval), 0},
351 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
352 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
353 {offsetof(struct acpi_battery, model_number), 1},
354 {offsetof(struct acpi_battery, serial_number), 1},
355 {offsetof(struct acpi_battery, type), 1},
356 {offsetof(struct acpi_battery, oem_info), 1},
357 };
358
359 static int extract_package(struct acpi_battery *battery,
360 union acpi_object *package,
361 struct acpi_offsets *offsets, int num)
362 {
363 int i;
364 union acpi_object *element;
365 if (package->type != ACPI_TYPE_PACKAGE)
366 return -EFAULT;
367 for (i = 0; i < num; ++i) {
368 if (package->package.count <= i)
369 return -EFAULT;
370 element = &package->package.elements[i];
371 if (offsets[i].mode) {
372 u8 *ptr = (u8 *)battery + offsets[i].offset;
373 if (element->type == ACPI_TYPE_STRING ||
374 element->type == ACPI_TYPE_BUFFER)
375 strncpy(ptr, element->string.pointer, 32);
376 else if (element->type == ACPI_TYPE_INTEGER) {
377 strncpy(ptr, (u8 *)&element->integer.value,
378 sizeof(u64));
379 ptr[sizeof(u64)] = 0;
380 } else
381 *ptr = 0; /* don't have value */
382 } else {
383 int *x = (int *)((u8 *)battery + offsets[i].offset);
384 *x = (element->type == ACPI_TYPE_INTEGER) ?
385 element->integer.value : -1;
386 }
387 }
388 return 0;
389 }
390
391 static int acpi_battery_get_status(struct acpi_battery *battery)
392 {
393 if (acpi_bus_get_status(battery->device)) {
394 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
395 return -ENODEV;
396 }
397 return 0;
398 }
399
400 static int acpi_battery_get_info(struct acpi_battery *battery)
401 {
402 int result = -EFAULT;
403 acpi_status status = 0;
404 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
405 "_BIX" : "_BIF";
406
407 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
408
409 if (!acpi_battery_present(battery))
410 return 0;
411 mutex_lock(&battery->lock);
412 status = acpi_evaluate_object(battery->device->handle, name,
413 NULL, &buffer);
414 mutex_unlock(&battery->lock);
415
416 if (ACPI_FAILURE(status)) {
417 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
418 return -ENODEV;
419 }
420 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
421 result = extract_package(battery, buffer.pointer,
422 extended_info_offsets,
423 ARRAY_SIZE(extended_info_offsets));
424 else
425 result = extract_package(battery, buffer.pointer,
426 info_offsets, ARRAY_SIZE(info_offsets));
427 kfree(buffer.pointer);
428 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
429 battery->full_charge_capacity = battery->design_capacity;
430 return result;
431 }
432
433 static int acpi_battery_get_state(struct acpi_battery *battery)
434 {
435 int result = 0;
436 acpi_status status = 0;
437 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
438
439 if (!acpi_battery_present(battery))
440 return 0;
441
442 if (battery->update_time &&
443 time_before(jiffies, battery->update_time +
444 msecs_to_jiffies(cache_time)))
445 return 0;
446
447 mutex_lock(&battery->lock);
448 status = acpi_evaluate_object(battery->device->handle, "_BST",
449 NULL, &buffer);
450 mutex_unlock(&battery->lock);
451
452 if (ACPI_FAILURE(status)) {
453 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
454 return -ENODEV;
455 }
456
457 result = extract_package(battery, buffer.pointer,
458 state_offsets, ARRAY_SIZE(state_offsets));
459 battery->update_time = jiffies;
460 kfree(buffer.pointer);
461
462 if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
463 battery->rate_now != -1)
464 battery->rate_now = abs((s16)battery->rate_now);
465
466 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
467 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
468 battery->capacity_now = (battery->capacity_now *
469 battery->full_charge_capacity) / 100;
470 return result;
471 }
472
473 static int acpi_battery_set_alarm(struct acpi_battery *battery)
474 {
475 acpi_status status = 0;
476 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
477 struct acpi_object_list arg_list = { 1, &arg0 };
478
479 if (!acpi_battery_present(battery) ||
480 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
481 return -ENODEV;
482
483 arg0.integer.value = battery->alarm;
484
485 mutex_lock(&battery->lock);
486 status = acpi_evaluate_object(battery->device->handle, "_BTP",
487 &arg_list, NULL);
488 mutex_unlock(&battery->lock);
489
490 if (ACPI_FAILURE(status))
491 return -ENODEV;
492
493 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
494 return 0;
495 }
496
497 static int acpi_battery_init_alarm(struct acpi_battery *battery)
498 {
499 acpi_status status = AE_OK;
500 acpi_handle handle = NULL;
501
502 /* See if alarms are supported, and if so, set default */
503 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
504 if (ACPI_FAILURE(status)) {
505 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
506 return 0;
507 }
508 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
509 if (!battery->alarm)
510 battery->alarm = battery->design_capacity_warning;
511 return acpi_battery_set_alarm(battery);
512 }
513
514 static ssize_t acpi_battery_alarm_show(struct device *dev,
515 struct device_attribute *attr,
516 char *buf)
517 {
518 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
519 return sprintf(buf, "%d\n", battery->alarm * 1000);
520 }
521
522 static ssize_t acpi_battery_alarm_store(struct device *dev,
523 struct device_attribute *attr,
524 const char *buf, size_t count)
525 {
526 unsigned long x;
527 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
528 if (sscanf(buf, "%ld\n", &x) == 1)
529 battery->alarm = x/1000;
530 if (acpi_battery_present(battery))
531 acpi_battery_set_alarm(battery);
532 return count;
533 }
534
535 static struct device_attribute alarm_attr = {
536 .attr = {.name = "alarm", .mode = 0644},
537 .show = acpi_battery_alarm_show,
538 .store = acpi_battery_alarm_store,
539 };
540
541 static int sysfs_add_battery(struct acpi_battery *battery)
542 {
543 int result;
544
545 if (battery->power_unit) {
546 battery->bat.properties = charge_battery_props;
547 battery->bat.num_properties =
548 ARRAY_SIZE(charge_battery_props);
549 } else {
550 battery->bat.properties = energy_battery_props;
551 battery->bat.num_properties =
552 ARRAY_SIZE(energy_battery_props);
553 }
554
555 battery->bat.name = acpi_device_bid(battery->device);
556 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
557 battery->bat.get_property = acpi_battery_get_property;
558
559 result = power_supply_register(&battery->device->dev, &battery->bat);
560 if (result)
561 return result;
562 return device_create_file(battery->bat.dev, &alarm_attr);
563 }
564
565 static void sysfs_remove_battery(struct acpi_battery *battery)
566 {
567 if (!battery->bat.dev)
568 return;
569 device_remove_file(battery->bat.dev, &alarm_attr);
570 power_supply_unregister(&battery->bat);
571 battery->bat.dev = NULL;
572 }
573
574 static void acpi_battery_quirks(struct acpi_battery *battery)
575 {
576 if (dmi_name_in_vendors("Acer") && battery->power_unit) {
577 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
578 }
579 }
580
581 /*
582 * According to the ACPI spec, some kinds of primary batteries can
583 * report percentage battery remaining capacity directly to OS.
584 * In this case, it reports the Last Full Charged Capacity == 100
585 * and BatteryPresentRate == 0xFFFFFFFF.
586 *
587 * Now we found some battery reports percentage remaining capacity
588 * even if it's rechargeable.
589 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
590 *
591 * Handle this correctly so that they won't break userspace.
592 */
593 static void acpi_battery_quirks2(struct acpi_battery *battery)
594 {
595 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
596 return ;
597
598 if (battery->full_charge_capacity == 100 &&
599 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
600 battery->capacity_now >=0 && battery->capacity_now <= 100) {
601 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
602 battery->full_charge_capacity = battery->design_capacity;
603 battery->capacity_now = (battery->capacity_now *
604 battery->full_charge_capacity) / 100;
605 }
606 }
607
608 static int acpi_battery_update(struct acpi_battery *battery)
609 {
610 int result, old_present = acpi_battery_present(battery);
611 result = acpi_battery_get_status(battery);
612 if (result)
613 return result;
614 if (!acpi_battery_present(battery)) {
615 sysfs_remove_battery(battery);
616 battery->update_time = 0;
617 return 0;
618 }
619 if (!battery->update_time ||
620 old_present != acpi_battery_present(battery)) {
621 result = acpi_battery_get_info(battery);
622 if (result)
623 return result;
624 acpi_battery_quirks(battery);
625 acpi_battery_init_alarm(battery);
626 }
627 if (!battery->bat.dev)
628 sysfs_add_battery(battery);
629 result = acpi_battery_get_state(battery);
630 acpi_battery_quirks2(battery);
631 return result;
632 }
633
634 static void acpi_battery_refresh(struct acpi_battery *battery)
635 {
636 if (!battery->bat.dev)
637 return;
638
639 acpi_battery_get_info(battery);
640 /* The battery may have changed its reporting units. */
641 sysfs_remove_battery(battery);
642 sysfs_add_battery(battery);
643 }
644
645 /* --------------------------------------------------------------------------
646 FS Interface (/proc)
647 -------------------------------------------------------------------------- */
648
649 #ifdef CONFIG_ACPI_PROCFS_POWER
650 static struct proc_dir_entry *acpi_battery_dir;
651
652 static int acpi_battery_print_info(struct seq_file *seq, int result)
653 {
654 struct acpi_battery *battery = seq->private;
655
656 if (result)
657 goto end;
658
659 seq_printf(seq, "present: %s\n",
660 acpi_battery_present(battery)?"yes":"no");
661 if (!acpi_battery_present(battery))
662 goto end;
663 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
664 seq_printf(seq, "design capacity: unknown\n");
665 else
666 seq_printf(seq, "design capacity: %d %sh\n",
667 battery->design_capacity,
668 acpi_battery_units(battery));
669
670 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
671 seq_printf(seq, "last full capacity: unknown\n");
672 else
673 seq_printf(seq, "last full capacity: %d %sh\n",
674 battery->full_charge_capacity,
675 acpi_battery_units(battery));
676
677 seq_printf(seq, "battery technology: %srechargeable\n",
678 (!battery->technology)?"non-":"");
679
680 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
681 seq_printf(seq, "design voltage: unknown\n");
682 else
683 seq_printf(seq, "design voltage: %d mV\n",
684 battery->design_voltage);
685 seq_printf(seq, "design capacity warning: %d %sh\n",
686 battery->design_capacity_warning,
687 acpi_battery_units(battery));
688 seq_printf(seq, "design capacity low: %d %sh\n",
689 battery->design_capacity_low,
690 acpi_battery_units(battery));
691 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
692 seq_printf(seq, "capacity granularity 1: %d %sh\n",
693 battery->capacity_granularity_1,
694 acpi_battery_units(battery));
695 seq_printf(seq, "capacity granularity 2: %d %sh\n",
696 battery->capacity_granularity_2,
697 acpi_battery_units(battery));
698 seq_printf(seq, "model number: %s\n", battery->model_number);
699 seq_printf(seq, "serial number: %s\n", battery->serial_number);
700 seq_printf(seq, "battery type: %s\n", battery->type);
701 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
702 end:
703 if (result)
704 seq_printf(seq, "ERROR: Unable to read battery info\n");
705 return result;
706 }
707
708 static int acpi_battery_print_state(struct seq_file *seq, int result)
709 {
710 struct acpi_battery *battery = seq->private;
711
712 if (result)
713 goto end;
714
715 seq_printf(seq, "present: %s\n",
716 acpi_battery_present(battery)?"yes":"no");
717 if (!acpi_battery_present(battery))
718 goto end;
719
720 seq_printf(seq, "capacity state: %s\n",
721 (battery->state & 0x04)?"critical":"ok");
722 if ((battery->state & 0x01) && (battery->state & 0x02))
723 seq_printf(seq,
724 "charging state: charging/discharging\n");
725 else if (battery->state & 0x01)
726 seq_printf(seq, "charging state: discharging\n");
727 else if (battery->state & 0x02)
728 seq_printf(seq, "charging state: charging\n");
729 else
730 seq_printf(seq, "charging state: charged\n");
731
732 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
733 seq_printf(seq, "present rate: unknown\n");
734 else
735 seq_printf(seq, "present rate: %d %s\n",
736 battery->rate_now, acpi_battery_units(battery));
737
738 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
739 seq_printf(seq, "remaining capacity: unknown\n");
740 else
741 seq_printf(seq, "remaining capacity: %d %sh\n",
742 battery->capacity_now, acpi_battery_units(battery));
743 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
744 seq_printf(seq, "present voltage: unknown\n");
745 else
746 seq_printf(seq, "present voltage: %d mV\n",
747 battery->voltage_now);
748 end:
749 if (result)
750 seq_printf(seq, "ERROR: Unable to read battery state\n");
751
752 return result;
753 }
754
755 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
756 {
757 struct acpi_battery *battery = seq->private;
758
759 if (result)
760 goto end;
761
762 if (!acpi_battery_present(battery)) {
763 seq_printf(seq, "present: no\n");
764 goto end;
765 }
766 seq_printf(seq, "alarm: ");
767 if (!battery->alarm)
768 seq_printf(seq, "unsupported\n");
769 else
770 seq_printf(seq, "%u %sh\n", battery->alarm,
771 acpi_battery_units(battery));
772 end:
773 if (result)
774 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
775 return result;
776 }
777
778 static ssize_t acpi_battery_write_alarm(struct file *file,
779 const char __user * buffer,
780 size_t count, loff_t * ppos)
781 {
782 int result = 0;
783 char alarm_string[12] = { '\0' };
784 struct seq_file *m = file->private_data;
785 struct acpi_battery *battery = m->private;
786
787 if (!battery || (count > sizeof(alarm_string) - 1))
788 return -EINVAL;
789 if (!acpi_battery_present(battery)) {
790 result = -ENODEV;
791 goto end;
792 }
793 if (copy_from_user(alarm_string, buffer, count)) {
794 result = -EFAULT;
795 goto end;
796 }
797 alarm_string[count] = '\0';
798 battery->alarm = simple_strtol(alarm_string, NULL, 0);
799 result = acpi_battery_set_alarm(battery);
800 end:
801 if (!result)
802 return count;
803 return result;
804 }
805
806 typedef int(*print_func)(struct seq_file *seq, int result);
807
808 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
809 acpi_battery_print_info,
810 acpi_battery_print_state,
811 acpi_battery_print_alarm,
812 };
813
814 static int acpi_battery_read(int fid, struct seq_file *seq)
815 {
816 struct acpi_battery *battery = seq->private;
817 int result = acpi_battery_update(battery);
818 return acpi_print_funcs[fid](seq, result);
819 }
820
821 #define DECLARE_FILE_FUNCTIONS(_name) \
822 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
823 { \
824 return acpi_battery_read(_name##_tag, seq); \
825 } \
826 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
827 { \
828 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
829 }
830
831 DECLARE_FILE_FUNCTIONS(info);
832 DECLARE_FILE_FUNCTIONS(state);
833 DECLARE_FILE_FUNCTIONS(alarm);
834
835 #undef DECLARE_FILE_FUNCTIONS
836
837 #define FILE_DESCRIPTION_RO(_name) \
838 { \
839 .name = __stringify(_name), \
840 .mode = S_IRUGO, \
841 .ops = { \
842 .open = acpi_battery_##_name##_open_fs, \
843 .read = seq_read, \
844 .llseek = seq_lseek, \
845 .release = single_release, \
846 .owner = THIS_MODULE, \
847 }, \
848 }
849
850 #define FILE_DESCRIPTION_RW(_name) \
851 { \
852 .name = __stringify(_name), \
853 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
854 .ops = { \
855 .open = acpi_battery_##_name##_open_fs, \
856 .read = seq_read, \
857 .llseek = seq_lseek, \
858 .write = acpi_battery_write_##_name, \
859 .release = single_release, \
860 .owner = THIS_MODULE, \
861 }, \
862 }
863
864 static struct battery_file {
865 struct file_operations ops;
866 mode_t mode;
867 const char *name;
868 } acpi_battery_file[] = {
869 FILE_DESCRIPTION_RO(info),
870 FILE_DESCRIPTION_RO(state),
871 FILE_DESCRIPTION_RW(alarm),
872 };
873
874 #undef FILE_DESCRIPTION_RO
875 #undef FILE_DESCRIPTION_RW
876
877 static int acpi_battery_add_fs(struct acpi_device *device)
878 {
879 struct proc_dir_entry *entry = NULL;
880 int i;
881
882 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
883 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
884 if (!acpi_device_dir(device)) {
885 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
886 acpi_battery_dir);
887 if (!acpi_device_dir(device))
888 return -ENODEV;
889 }
890
891 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
892 entry = proc_create_data(acpi_battery_file[i].name,
893 acpi_battery_file[i].mode,
894 acpi_device_dir(device),
895 &acpi_battery_file[i].ops,
896 acpi_driver_data(device));
897 if (!entry)
898 return -ENODEV;
899 }
900 return 0;
901 }
902
903 static void acpi_battery_remove_fs(struct acpi_device *device)
904 {
905 int i;
906 if (!acpi_device_dir(device))
907 return;
908 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
909 remove_proc_entry(acpi_battery_file[i].name,
910 acpi_device_dir(device));
911
912 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
913 acpi_device_dir(device) = NULL;
914 }
915
916 #endif
917
918 /* --------------------------------------------------------------------------
919 Driver Interface
920 -------------------------------------------------------------------------- */
921
922 static void acpi_battery_notify(struct acpi_device *device, u32 event)
923 {
924 struct acpi_battery *battery = acpi_driver_data(device);
925 struct device *old;
926
927 if (!battery)
928 return;
929 old = battery->bat.dev;
930 if (event == ACPI_BATTERY_NOTIFY_INFO)
931 acpi_battery_refresh(battery);
932 acpi_battery_update(battery);
933 acpi_bus_generate_proc_event(device, event,
934 acpi_battery_present(battery));
935 acpi_bus_generate_netlink_event(device->pnp.device_class,
936 dev_name(&device->dev), event,
937 acpi_battery_present(battery));
938 /* acpi_battery_update could remove power_supply object */
939 if (old && battery->bat.dev)
940 power_supply_changed(&battery->bat);
941 }
942
943 static int acpi_battery_add(struct acpi_device *device)
944 {
945 int result = 0;
946 struct acpi_battery *battery = NULL;
947 acpi_handle handle;
948 if (!device)
949 return -EINVAL;
950 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
951 if (!battery)
952 return -ENOMEM;
953 battery->device = device;
954 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
955 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
956 device->driver_data = battery;
957 mutex_init(&battery->lock);
958 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
959 "_BIX", &handle)))
960 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
961 acpi_battery_update(battery);
962 #ifdef CONFIG_ACPI_PROCFS_POWER
963 result = acpi_battery_add_fs(device);
964 #endif
965 if (!result) {
966 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
967 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
968 device->status.battery_present ? "present" : "absent");
969 } else {
970 #ifdef CONFIG_ACPI_PROCFS_POWER
971 acpi_battery_remove_fs(device);
972 #endif
973 kfree(battery);
974 }
975 return result;
976 }
977
978 static int acpi_battery_remove(struct acpi_device *device, int type)
979 {
980 struct acpi_battery *battery = NULL;
981
982 if (!device || !acpi_driver_data(device))
983 return -EINVAL;
984 battery = acpi_driver_data(device);
985 #ifdef CONFIG_ACPI_PROCFS_POWER
986 acpi_battery_remove_fs(device);
987 #endif
988 sysfs_remove_battery(battery);
989 mutex_destroy(&battery->lock);
990 kfree(battery);
991 return 0;
992 }
993
994 /* this is needed to learn about changes made in suspended state */
995 static int acpi_battery_resume(struct acpi_device *device)
996 {
997 struct acpi_battery *battery;
998 if (!device)
999 return -EINVAL;
1000 battery = acpi_driver_data(device);
1001 battery->update_time = 0;
1002 acpi_battery_update(battery);
1003 return 0;
1004 }
1005
1006 static struct acpi_driver acpi_battery_driver = {
1007 .name = "battery",
1008 .class = ACPI_BATTERY_CLASS,
1009 .ids = battery_device_ids,
1010 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1011 .ops = {
1012 .add = acpi_battery_add,
1013 .resume = acpi_battery_resume,
1014 .remove = acpi_battery_remove,
1015 .notify = acpi_battery_notify,
1016 },
1017 };
1018
1019 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1020 {
1021 if (acpi_disabled)
1022 return;
1023 #ifdef CONFIG_ACPI_PROCFS_POWER
1024 acpi_battery_dir = acpi_lock_battery_dir();
1025 if (!acpi_battery_dir)
1026 return;
1027 #endif
1028 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1029 #ifdef CONFIG_ACPI_PROCFS_POWER
1030 acpi_unlock_battery_dir(acpi_battery_dir);
1031 #endif
1032 return;
1033 }
1034 return;
1035 }
1036
1037 static int __init acpi_battery_init(void)
1038 {
1039 async_schedule(acpi_battery_init_async, NULL);
1040 return 0;
1041 }
1042
1043 static void __exit acpi_battery_exit(void)
1044 {
1045 acpi_bus_unregister_driver(&acpi_battery_driver);
1046 #ifdef CONFIG_ACPI_PROCFS_POWER
1047 acpi_unlock_battery_dir(acpi_battery_dir);
1048 #endif
1049 }
1050
1051 module_init(acpi_battery_init);
1052 module_exit(acpi_battery_exit);
WandBoard kernel