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Linux 3.3-rc6
[linux/fpc-iii.git] / drivers / acpi / battery.c
blob86933ca8b4724372505530de753332907f488ebe
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 #include <linux/suspend.h>
37
38 #ifdef CONFIG_ACPI_PROCFS_POWER
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <asm/uaccess.h>
42 #endif
43
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46 #include <linux/power_supply.h>
47
48 #define PREFIX "ACPI: "
49
50 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
51
52 #define ACPI_BATTERY_CLASS "battery"
53 #define ACPI_BATTERY_DEVICE_NAME "Battery"
54 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
55 #define ACPI_BATTERY_NOTIFY_INFO 0x81
56 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
57
58 /* Battery power unit: 0 means mW, 1 means mA */
59 #define ACPI_BATTERY_POWER_UNIT_MA 1
60
61 #define _COMPONENT ACPI_BATTERY_COMPONENT
62
63 ACPI_MODULE_NAME("battery");
64
65 MODULE_AUTHOR("Paul Diefenbaugh");
66 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
67 MODULE_DESCRIPTION("ACPI Battery Driver");
68 MODULE_LICENSE("GPL");
69
70 static unsigned int cache_time = 1000;
71 module_param(cache_time, uint, 0644);
72 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
73
74 #ifdef CONFIG_ACPI_PROCFS_POWER
75 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
76 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
77
78 enum acpi_battery_files {
79 info_tag = 0,
80 state_tag,
81 alarm_tag,
82 ACPI_BATTERY_NUMFILES,
83 };
84
85 #endif
86
87 static const struct acpi_device_id battery_device_ids[] = {
88 {"PNP0C0A", 0},
89 {"", 0},
90 };
91
92 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
93
94 enum {
95 ACPI_BATTERY_ALARM_PRESENT,
96 ACPI_BATTERY_XINFO_PRESENT,
97 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
98 };
99
100 struct acpi_battery {
101 struct mutex lock;
102 struct mutex sysfs_lock;
103 struct power_supply bat;
104 struct acpi_device *device;
105 struct notifier_block pm_nb;
106 unsigned long update_time;
107 int rate_now;
108 int capacity_now;
109 int voltage_now;
110 int design_capacity;
111 int full_charge_capacity;
112 int technology;
113 int design_voltage;
114 int design_capacity_warning;
115 int design_capacity_low;
116 int cycle_count;
117 int measurement_accuracy;
118 int max_sampling_time;
119 int min_sampling_time;
120 int max_averaging_interval;
121 int min_averaging_interval;
122 int capacity_granularity_1;
123 int capacity_granularity_2;
124 int alarm;
125 char model_number[32];
126 char serial_number[32];
127 char type[32];
128 char oem_info[32];
129 int state;
130 int power_unit;
131 unsigned long flags;
132 };
133
134 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
135
136 inline int acpi_battery_present(struct acpi_battery *battery)
137 {
138 return battery->device->status.battery_present;
139 }
140
141 static int acpi_battery_technology(struct acpi_battery *battery)
142 {
143 if (!strcasecmp("NiCd", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_NiCd;
145 if (!strcasecmp("NiMH", battery->type))
146 return POWER_SUPPLY_TECHNOLOGY_NiMH;
147 if (!strcasecmp("LION", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_LION;
149 if (!strncasecmp("LI-ION", battery->type, 6))
150 return POWER_SUPPLY_TECHNOLOGY_LION;
151 if (!strcasecmp("LiP", battery->type))
152 return POWER_SUPPLY_TECHNOLOGY_LIPO;
153 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
154 }
155
156 static int acpi_battery_get_state(struct acpi_battery *battery);
157
158 static int acpi_battery_is_charged(struct acpi_battery *battery)
159 {
160 /* either charging or discharging */
161 if (battery->state != 0)
162 return 0;
163
164 /* battery not reporting charge */
165 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
166 battery->capacity_now == 0)
167 return 0;
168
169 /* good batteries update full_charge as the batteries degrade */
170 if (battery->full_charge_capacity == battery->capacity_now)
171 return 1;
172
173 /* fallback to using design values for broken batteries */
174 if (battery->design_capacity == battery->capacity_now)
175 return 1;
176
177 /* we don't do any sort of metric based on percentages */
178 return 0;
179 }
180
181 static int acpi_battery_get_property(struct power_supply *psy,
182 enum power_supply_property psp,
183 union power_supply_propval *val)
184 {
185 int ret = 0;
186 struct acpi_battery *battery = to_acpi_battery(psy);
187
188 if (acpi_battery_present(battery)) {
189 /* run battery update only if it is present */
190 acpi_battery_get_state(battery);
191 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
192 return -ENODEV;
193 switch (psp) {
194 case POWER_SUPPLY_PROP_STATUS:
195 if (battery->state & 0x01)
196 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
197 else if (battery->state & 0x02)
198 val->intval = POWER_SUPPLY_STATUS_CHARGING;
199 else if (acpi_battery_is_charged(battery))
200 val->intval = POWER_SUPPLY_STATUS_FULL;
201 else
202 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
203 break;
204 case POWER_SUPPLY_PROP_PRESENT:
205 val->intval = acpi_battery_present(battery);
206 break;
207 case POWER_SUPPLY_PROP_TECHNOLOGY:
208 val->intval = acpi_battery_technology(battery);
209 break;
210 case POWER_SUPPLY_PROP_CYCLE_COUNT:
211 val->intval = battery->cycle_count;
212 break;
213 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
214 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
215 ret = -ENODEV;
216 else
217 val->intval = battery->design_voltage * 1000;
218 break;
219 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
220 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
221 ret = -ENODEV;
222 else
223 val->intval = battery->voltage_now * 1000;
224 break;
225 case POWER_SUPPLY_PROP_CURRENT_NOW:
226 case POWER_SUPPLY_PROP_POWER_NOW:
227 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
228 ret = -ENODEV;
229 else
230 val->intval = battery->rate_now * 1000;
231 break;
232 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
233 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
234 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
235 ret = -ENODEV;
236 else
237 val->intval = battery->design_capacity * 1000;
238 break;
239 case POWER_SUPPLY_PROP_CHARGE_FULL:
240 case POWER_SUPPLY_PROP_ENERGY_FULL:
241 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
242 ret = -ENODEV;
243 else
244 val->intval = battery->full_charge_capacity * 1000;
245 break;
246 case POWER_SUPPLY_PROP_CHARGE_NOW:
247 case POWER_SUPPLY_PROP_ENERGY_NOW:
248 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
249 ret = -ENODEV;
250 else
251 val->intval = battery->capacity_now * 1000;
252 break;
253 case POWER_SUPPLY_PROP_MODEL_NAME:
254 val->strval = battery->model_number;
255 break;
256 case POWER_SUPPLY_PROP_MANUFACTURER:
257 val->strval = battery->oem_info;
258 break;
259 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
260 val->strval = battery->serial_number;
261 break;
262 default:
263 ret = -EINVAL;
264 }
265 return ret;
266 }
267
268 static enum power_supply_property charge_battery_props[] = {
269 POWER_SUPPLY_PROP_STATUS,
270 POWER_SUPPLY_PROP_PRESENT,
271 POWER_SUPPLY_PROP_TECHNOLOGY,
272 POWER_SUPPLY_PROP_CYCLE_COUNT,
273 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
274 POWER_SUPPLY_PROP_VOLTAGE_NOW,
275 POWER_SUPPLY_PROP_CURRENT_NOW,
276 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
277 POWER_SUPPLY_PROP_CHARGE_FULL,
278 POWER_SUPPLY_PROP_CHARGE_NOW,
279 POWER_SUPPLY_PROP_MODEL_NAME,
280 POWER_SUPPLY_PROP_MANUFACTURER,
281 POWER_SUPPLY_PROP_SERIAL_NUMBER,
282 };
283
284 static enum power_supply_property energy_battery_props[] = {
285 POWER_SUPPLY_PROP_STATUS,
286 POWER_SUPPLY_PROP_PRESENT,
287 POWER_SUPPLY_PROP_TECHNOLOGY,
288 POWER_SUPPLY_PROP_CYCLE_COUNT,
289 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
290 POWER_SUPPLY_PROP_VOLTAGE_NOW,
291 POWER_SUPPLY_PROP_POWER_NOW,
292 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
293 POWER_SUPPLY_PROP_ENERGY_FULL,
294 POWER_SUPPLY_PROP_ENERGY_NOW,
295 POWER_SUPPLY_PROP_MODEL_NAME,
296 POWER_SUPPLY_PROP_MANUFACTURER,
297 POWER_SUPPLY_PROP_SERIAL_NUMBER,
298 };
299
300 #ifdef CONFIG_ACPI_PROCFS_POWER
301 inline char *acpi_battery_units(struct acpi_battery *battery)
302 {
303 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
304 "mA" : "mW";
305 }
306 #endif
307
308 /* --------------------------------------------------------------------------
309 Battery Management
310 -------------------------------------------------------------------------- */
311 struct acpi_offsets {
312 size_t offset; /* offset inside struct acpi_sbs_battery */
313 u8 mode; /* int or string? */
314 };
315
316 static struct acpi_offsets state_offsets[] = {
317 {offsetof(struct acpi_battery, state), 0},
318 {offsetof(struct acpi_battery, rate_now), 0},
319 {offsetof(struct acpi_battery, capacity_now), 0},
320 {offsetof(struct acpi_battery, voltage_now), 0},
321 };
322
323 static struct acpi_offsets info_offsets[] = {
324 {offsetof(struct acpi_battery, power_unit), 0},
325 {offsetof(struct acpi_battery, design_capacity), 0},
326 {offsetof(struct acpi_battery, full_charge_capacity), 0},
327 {offsetof(struct acpi_battery, technology), 0},
328 {offsetof(struct acpi_battery, design_voltage), 0},
329 {offsetof(struct acpi_battery, design_capacity_warning), 0},
330 {offsetof(struct acpi_battery, design_capacity_low), 0},
331 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
332 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
333 {offsetof(struct acpi_battery, model_number), 1},
334 {offsetof(struct acpi_battery, serial_number), 1},
335 {offsetof(struct acpi_battery, type), 1},
336 {offsetof(struct acpi_battery, oem_info), 1},
337 };
338
339 static struct acpi_offsets extended_info_offsets[] = {
340 {offsetof(struct acpi_battery, power_unit), 0},
341 {offsetof(struct acpi_battery, design_capacity), 0},
342 {offsetof(struct acpi_battery, full_charge_capacity), 0},
343 {offsetof(struct acpi_battery, technology), 0},
344 {offsetof(struct acpi_battery, design_voltage), 0},
345 {offsetof(struct acpi_battery, design_capacity_warning), 0},
346 {offsetof(struct acpi_battery, design_capacity_low), 0},
347 {offsetof(struct acpi_battery, cycle_count), 0},
348 {offsetof(struct acpi_battery, measurement_accuracy), 0},
349 {offsetof(struct acpi_battery, max_sampling_time), 0},
350 {offsetof(struct acpi_battery, min_sampling_time), 0},
351 {offsetof(struct acpi_battery, max_averaging_interval), 0},
352 {offsetof(struct acpi_battery, min_averaging_interval), 0},
353 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
354 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
355 {offsetof(struct acpi_battery, model_number), 1},
356 {offsetof(struct acpi_battery, serial_number), 1},
357 {offsetof(struct acpi_battery, type), 1},
358 {offsetof(struct acpi_battery, oem_info), 1},
359 };
360
361 static int extract_package(struct acpi_battery *battery,
362 union acpi_object *package,
363 struct acpi_offsets *offsets, int num)
364 {
365 int i;
366 union acpi_object *element;
367 if (package->type != ACPI_TYPE_PACKAGE)
368 return -EFAULT;
369 for (i = 0; i < num; ++i) {
370 if (package->package.count <= i)
371 return -EFAULT;
372 element = &package->package.elements[i];
373 if (offsets[i].mode) {
374 u8 *ptr = (u8 *)battery + offsets[i].offset;
375 if (element->type == ACPI_TYPE_STRING ||
376 element->type == ACPI_TYPE_BUFFER)
377 strncpy(ptr, element->string.pointer, 32);
378 else if (element->type == ACPI_TYPE_INTEGER) {
379 strncpy(ptr, (u8 *)&element->integer.value,
380 sizeof(u64));
381 ptr[sizeof(u64)] = 0;
382 } else
383 *ptr = 0; /* don't have value */
384 } else {
385 int *x = (int *)((u8 *)battery + offsets[i].offset);
386 *x = (element->type == ACPI_TYPE_INTEGER) ?
387 element->integer.value : -1;
388 }
389 }
390 return 0;
391 }
392
393 static int acpi_battery_get_status(struct acpi_battery *battery)
394 {
395 if (acpi_bus_get_status(battery->device)) {
396 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
397 return -ENODEV;
398 }
399 return 0;
400 }
401
402 static int acpi_battery_get_info(struct acpi_battery *battery)
403 {
404 int result = -EFAULT;
405 acpi_status status = 0;
406 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
407 "_BIX" : "_BIF";
408
409 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
410
411 if (!acpi_battery_present(battery))
412 return 0;
413 mutex_lock(&battery->lock);
414 status = acpi_evaluate_object(battery->device->handle, name,
415 NULL, &buffer);
416 mutex_unlock(&battery->lock);
417
418 if (ACPI_FAILURE(status)) {
419 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
420 return -ENODEV;
421 }
422 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
423 result = extract_package(battery, buffer.pointer,
424 extended_info_offsets,
425 ARRAY_SIZE(extended_info_offsets));
426 else
427 result = extract_package(battery, buffer.pointer,
428 info_offsets, ARRAY_SIZE(info_offsets));
429 kfree(buffer.pointer);
430 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
431 battery->full_charge_capacity = battery->design_capacity;
432 return result;
433 }
434
435 static int acpi_battery_get_state(struct acpi_battery *battery)
436 {
437 int result = 0;
438 acpi_status status = 0;
439 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
440
441 if (!acpi_battery_present(battery))
442 return 0;
443
444 if (battery->update_time &&
445 time_before(jiffies, battery->update_time +
446 msecs_to_jiffies(cache_time)))
447 return 0;
448
449 mutex_lock(&battery->lock);
450 status = acpi_evaluate_object(battery->device->handle, "_BST",
451 NULL, &buffer);
452 mutex_unlock(&battery->lock);
453
454 if (ACPI_FAILURE(status)) {
455 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
456 return -ENODEV;
457 }
458
459 result = extract_package(battery, buffer.pointer,
460 state_offsets, ARRAY_SIZE(state_offsets));
461 battery->update_time = jiffies;
462 kfree(buffer.pointer);
463
464 /* For buggy DSDTs that report negative 16-bit values for either
465 * charging or discharging current and/or report 0 as 65536
466 * due to bad math.
467 */
468 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
469 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
470 (s16)(battery->rate_now) < 0) {
471 battery->rate_now = abs((s16)battery->rate_now);
472 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
473 " invalid.\n");
474 }
475
476 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
477 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
478 battery->capacity_now = (battery->capacity_now *
479 battery->full_charge_capacity) / 100;
480 return result;
481 }
482
483 static int acpi_battery_set_alarm(struct acpi_battery *battery)
484 {
485 acpi_status status = 0;
486 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
487 struct acpi_object_list arg_list = { 1, &arg0 };
488
489 if (!acpi_battery_present(battery) ||
490 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
491 return -ENODEV;
492
493 arg0.integer.value = battery->alarm;
494
495 mutex_lock(&battery->lock);
496 status = acpi_evaluate_object(battery->device->handle, "_BTP",
497 &arg_list, NULL);
498 mutex_unlock(&battery->lock);
499
500 if (ACPI_FAILURE(status))
501 return -ENODEV;
502
503 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
504 return 0;
505 }
506
507 static int acpi_battery_init_alarm(struct acpi_battery *battery)
508 {
509 acpi_status status = AE_OK;
510 acpi_handle handle = NULL;
511
512 /* See if alarms are supported, and if so, set default */
513 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
514 if (ACPI_FAILURE(status)) {
515 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
516 return 0;
517 }
518 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
519 if (!battery->alarm)
520 battery->alarm = battery->design_capacity_warning;
521 return acpi_battery_set_alarm(battery);
522 }
523
524 static ssize_t acpi_battery_alarm_show(struct device *dev,
525 struct device_attribute *attr,
526 char *buf)
527 {
528 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
529 return sprintf(buf, "%d\n", battery->alarm * 1000);
530 }
531
532 static ssize_t acpi_battery_alarm_store(struct device *dev,
533 struct device_attribute *attr,
534 const char *buf, size_t count)
535 {
536 unsigned long x;
537 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
538 if (sscanf(buf, "%ld\n", &x) == 1)
539 battery->alarm = x/1000;
540 if (acpi_battery_present(battery))
541 acpi_battery_set_alarm(battery);
542 return count;
543 }
544
545 static struct device_attribute alarm_attr = {
546 .attr = {.name = "alarm", .mode = 0644},
547 .show = acpi_battery_alarm_show,
548 .store = acpi_battery_alarm_store,
549 };
550
551 static int sysfs_add_battery(struct acpi_battery *battery)
552 {
553 int result;
554
555 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
556 battery->bat.properties = charge_battery_props;
557 battery->bat.num_properties =
558 ARRAY_SIZE(charge_battery_props);
559 } else {
560 battery->bat.properties = energy_battery_props;
561 battery->bat.num_properties =
562 ARRAY_SIZE(energy_battery_props);
563 }
564
565 battery->bat.name = acpi_device_bid(battery->device);
566 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
567 battery->bat.get_property = acpi_battery_get_property;
568
569 result = power_supply_register(&battery->device->dev, &battery->bat);
570 if (result)
571 return result;
572 return device_create_file(battery->bat.dev, &alarm_attr);
573 }
574
575 static void sysfs_remove_battery(struct acpi_battery *battery)
576 {
577 mutex_lock(&battery->sysfs_lock);
578 if (!battery->bat.dev) {
579 mutex_unlock(&battery->sysfs_lock);
580 return;
581 }
582
583 device_remove_file(battery->bat.dev, &alarm_attr);
584 power_supply_unregister(&battery->bat);
585 battery->bat.dev = NULL;
586 mutex_unlock(&battery->sysfs_lock);
587 }
588
589 /*
590 * According to the ACPI spec, some kinds of primary batteries can
591 * report percentage battery remaining capacity directly to OS.
592 * In this case, it reports the Last Full Charged Capacity == 100
593 * and BatteryPresentRate == 0xFFFFFFFF.
594 *
595 * Now we found some battery reports percentage remaining capacity
596 * even if it's rechargeable.
597 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
598 *
599 * Handle this correctly so that they won't break userspace.
600 */
601 static void acpi_battery_quirks(struct acpi_battery *battery)
602 {
603 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
604 return ;
605
606 if (battery->full_charge_capacity == 100 &&
607 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
608 battery->capacity_now >=0 && battery->capacity_now <= 100) {
609 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
610 battery->full_charge_capacity = battery->design_capacity;
611 battery->capacity_now = (battery->capacity_now *
612 battery->full_charge_capacity) / 100;
613 }
614 }
615
616 static int acpi_battery_update(struct acpi_battery *battery)
617 {
618 int result, old_present = acpi_battery_present(battery);
619 result = acpi_battery_get_status(battery);
620 if (result)
621 return result;
622 if (!acpi_battery_present(battery)) {
623 sysfs_remove_battery(battery);
624 battery->update_time = 0;
625 return 0;
626 }
627 if (!battery->update_time ||
628 old_present != acpi_battery_present(battery)) {
629 result = acpi_battery_get_info(battery);
630 if (result)
631 return result;
632 acpi_battery_init_alarm(battery);
633 }
634 if (!battery->bat.dev) {
635 result = sysfs_add_battery(battery);
636 if (result)
637 return result;
638 }
639 result = acpi_battery_get_state(battery);
640 acpi_battery_quirks(battery);
641 return result;
642 }
643
644 static void acpi_battery_refresh(struct acpi_battery *battery)
645 {
646 if (!battery->bat.dev)
647 return;
648
649 acpi_battery_get_info(battery);
650 /* The battery may have changed its reporting units. */
651 sysfs_remove_battery(battery);
652 sysfs_add_battery(battery);
653 }
654
655 /* --------------------------------------------------------------------------
656 FS Interface (/proc)
657 -------------------------------------------------------------------------- */
658
659 #ifdef CONFIG_ACPI_PROCFS_POWER
660 static struct proc_dir_entry *acpi_battery_dir;
661
662 static int acpi_battery_print_info(struct seq_file *seq, int result)
663 {
664 struct acpi_battery *battery = seq->private;
665
666 if (result)
667 goto end;
668
669 seq_printf(seq, "present: %s\n",
670 acpi_battery_present(battery)?"yes":"no");
671 if (!acpi_battery_present(battery))
672 goto end;
673 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
674 seq_printf(seq, "design capacity: unknown\n");
675 else
676 seq_printf(seq, "design capacity: %d %sh\n",
677 battery->design_capacity,
678 acpi_battery_units(battery));
679
680 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
681 seq_printf(seq, "last full capacity: unknown\n");
682 else
683 seq_printf(seq, "last full capacity: %d %sh\n",
684 battery->full_charge_capacity,
685 acpi_battery_units(battery));
686
687 seq_printf(seq, "battery technology: %srechargeable\n",
688 (!battery->technology)?"non-":"");
689
690 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
691 seq_printf(seq, "design voltage: unknown\n");
692 else
693 seq_printf(seq, "design voltage: %d mV\n",
694 battery->design_voltage);
695 seq_printf(seq, "design capacity warning: %d %sh\n",
696 battery->design_capacity_warning,
697 acpi_battery_units(battery));
698 seq_printf(seq, "design capacity low: %d %sh\n",
699 battery->design_capacity_low,
700 acpi_battery_units(battery));
701 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
702 seq_printf(seq, "capacity granularity 1: %d %sh\n",
703 battery->capacity_granularity_1,
704 acpi_battery_units(battery));
705 seq_printf(seq, "capacity granularity 2: %d %sh\n",
706 battery->capacity_granularity_2,
707 acpi_battery_units(battery));
708 seq_printf(seq, "model number: %s\n", battery->model_number);
709 seq_printf(seq, "serial number: %s\n", battery->serial_number);
710 seq_printf(seq, "battery type: %s\n", battery->type);
711 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
712 end:
713 if (result)
714 seq_printf(seq, "ERROR: Unable to read battery info\n");
715 return result;
716 }
717
718 static int acpi_battery_print_state(struct seq_file *seq, int result)
719 {
720 struct acpi_battery *battery = seq->private;
721
722 if (result)
723 goto end;
724
725 seq_printf(seq, "present: %s\n",
726 acpi_battery_present(battery)?"yes":"no");
727 if (!acpi_battery_present(battery))
728 goto end;
729
730 seq_printf(seq, "capacity state: %s\n",
731 (battery->state & 0x04)?"critical":"ok");
732 if ((battery->state & 0x01) && (battery->state & 0x02))
733 seq_printf(seq,
734 "charging state: charging/discharging\n");
735 else if (battery->state & 0x01)
736 seq_printf(seq, "charging state: discharging\n");
737 else if (battery->state & 0x02)
738 seq_printf(seq, "charging state: charging\n");
739 else
740 seq_printf(seq, "charging state: charged\n");
741
742 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
743 seq_printf(seq, "present rate: unknown\n");
744 else
745 seq_printf(seq, "present rate: %d %s\n",
746 battery->rate_now, acpi_battery_units(battery));
747
748 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
749 seq_printf(seq, "remaining capacity: unknown\n");
750 else
751 seq_printf(seq, "remaining capacity: %d %sh\n",
752 battery->capacity_now, acpi_battery_units(battery));
753 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
754 seq_printf(seq, "present voltage: unknown\n");
755 else
756 seq_printf(seq, "present voltage: %d mV\n",
757 battery->voltage_now);
758 end:
759 if (result)
760 seq_printf(seq, "ERROR: Unable to read battery state\n");
761
762 return result;
763 }
764
765 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
766 {
767 struct acpi_battery *battery = seq->private;
768
769 if (result)
770 goto end;
771
772 if (!acpi_battery_present(battery)) {
773 seq_printf(seq, "present: no\n");
774 goto end;
775 }
776 seq_printf(seq, "alarm: ");
777 if (!battery->alarm)
778 seq_printf(seq, "unsupported\n");
779 else
780 seq_printf(seq, "%u %sh\n", battery->alarm,
781 acpi_battery_units(battery));
782 end:
783 if (result)
784 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
785 return result;
786 }
787
788 static ssize_t acpi_battery_write_alarm(struct file *file,
789 const char __user * buffer,
790 size_t count, loff_t * ppos)
791 {
792 int result = 0;
793 char alarm_string[12] = { '\0' };
794 struct seq_file *m = file->private_data;
795 struct acpi_battery *battery = m->private;
796
797 if (!battery || (count > sizeof(alarm_string) - 1))
798 return -EINVAL;
799 if (!acpi_battery_present(battery)) {
800 result = -ENODEV;
801 goto end;
802 }
803 if (copy_from_user(alarm_string, buffer, count)) {
804 result = -EFAULT;
805 goto end;
806 }
807 alarm_string[count] = '\0';
808 battery->alarm = simple_strtol(alarm_string, NULL, 0);
809 result = acpi_battery_set_alarm(battery);
810 end:
811 if (!result)
812 return count;
813 return result;
814 }
815
816 typedef int(*print_func)(struct seq_file *seq, int result);
817
818 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
819 acpi_battery_print_info,
820 acpi_battery_print_state,
821 acpi_battery_print_alarm,
822 };
823
824 static int acpi_battery_read(int fid, struct seq_file *seq)
825 {
826 struct acpi_battery *battery = seq->private;
827 int result = acpi_battery_update(battery);
828 return acpi_print_funcs[fid](seq, result);
829 }
830
831 #define DECLARE_FILE_FUNCTIONS(_name) \
832 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
833 { \
834 return acpi_battery_read(_name##_tag, seq); \
835 } \
836 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
837 { \
838 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
839 }
840
841 DECLARE_FILE_FUNCTIONS(info);
842 DECLARE_FILE_FUNCTIONS(state);
843 DECLARE_FILE_FUNCTIONS(alarm);
844
845 #undef DECLARE_FILE_FUNCTIONS
846
847 #define FILE_DESCRIPTION_RO(_name) \
848 { \
849 .name = __stringify(_name), \
850 .mode = S_IRUGO, \
851 .ops = { \
852 .open = acpi_battery_##_name##_open_fs, \
853 .read = seq_read, \
854 .llseek = seq_lseek, \
855 .release = single_release, \
856 .owner = THIS_MODULE, \
857 }, \
858 }
859
860 #define FILE_DESCRIPTION_RW(_name) \
861 { \
862 .name = __stringify(_name), \
863 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
864 .ops = { \
865 .open = acpi_battery_##_name##_open_fs, \
866 .read = seq_read, \
867 .llseek = seq_lseek, \
868 .write = acpi_battery_write_##_name, \
869 .release = single_release, \
870 .owner = THIS_MODULE, \
871 }, \
872 }
873
874 static const struct battery_file {
875 struct file_operations ops;
876 umode_t mode;
877 const char *name;
878 } acpi_battery_file[] = {
879 FILE_DESCRIPTION_RO(info),
880 FILE_DESCRIPTION_RO(state),
881 FILE_DESCRIPTION_RW(alarm),
882 };
883
884 #undef FILE_DESCRIPTION_RO
885 #undef FILE_DESCRIPTION_RW
886
887 static int acpi_battery_add_fs(struct acpi_device *device)
888 {
889 struct proc_dir_entry *entry = NULL;
890 int i;
891
892 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
893 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
894 if (!acpi_device_dir(device)) {
895 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
896 acpi_battery_dir);
897 if (!acpi_device_dir(device))
898 return -ENODEV;
899 }
900
901 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
902 entry = proc_create_data(acpi_battery_file[i].name,
903 acpi_battery_file[i].mode,
904 acpi_device_dir(device),
905 &acpi_battery_file[i].ops,
906 acpi_driver_data(device));
907 if (!entry)
908 return -ENODEV;
909 }
910 return 0;
911 }
912
913 static void acpi_battery_remove_fs(struct acpi_device *device)
914 {
915 int i;
916 if (!acpi_device_dir(device))
917 return;
918 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
919 remove_proc_entry(acpi_battery_file[i].name,
920 acpi_device_dir(device));
921
922 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
923 acpi_device_dir(device) = NULL;
924 }
925
926 #endif
927
928 /* --------------------------------------------------------------------------
929 Driver Interface
930 -------------------------------------------------------------------------- */
931
932 static void acpi_battery_notify(struct acpi_device *device, u32 event)
933 {
934 struct acpi_battery *battery = acpi_driver_data(device);
935 struct device *old;
936
937 if (!battery)
938 return;
939 old = battery->bat.dev;
940 if (event == ACPI_BATTERY_NOTIFY_INFO)
941 acpi_battery_refresh(battery);
942 acpi_battery_update(battery);
943 acpi_bus_generate_proc_event(device, event,
944 acpi_battery_present(battery));
945 acpi_bus_generate_netlink_event(device->pnp.device_class,
946 dev_name(&device->dev), event,
947 acpi_battery_present(battery));
948 /* acpi_battery_update could remove power_supply object */
949 if (old && battery->bat.dev)
950 power_supply_changed(&battery->bat);
951 }
952
953 static int battery_notify(struct notifier_block *nb,
954 unsigned long mode, void *_unused)
955 {
956 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
957 pm_nb);
958 switch (mode) {
959 case PM_POST_HIBERNATION:
960 case PM_POST_SUSPEND:
961 if (battery->bat.dev) {
962 sysfs_remove_battery(battery);
963 sysfs_add_battery(battery);
964 }
965 break;
966 }
967
968 return 0;
969 }
970
971 static int acpi_battery_add(struct acpi_device *device)
972 {
973 int result = 0;
974 struct acpi_battery *battery = NULL;
975 acpi_handle handle;
976 if (!device)
977 return -EINVAL;
978 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
979 if (!battery)
980 return -ENOMEM;
981 battery->device = device;
982 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
983 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
984 device->driver_data = battery;
985 mutex_init(&battery->lock);
986 mutex_init(&battery->sysfs_lock);
987 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
988 "_BIX", &handle)))
989 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
990 result = acpi_battery_update(battery);
991 if (result)
992 goto fail;
993 #ifdef CONFIG_ACPI_PROCFS_POWER
994 result = acpi_battery_add_fs(device);
995 #endif
996 if (result) {
997 #ifdef CONFIG_ACPI_PROCFS_POWER
998 acpi_battery_remove_fs(device);
999 #endif
1000 goto fail;
1001 }
1002
1003 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1004 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1005 device->status.battery_present ? "present" : "absent");
1006
1007 battery->pm_nb.notifier_call = battery_notify;
1008 register_pm_notifier(&battery->pm_nb);
1009
1010 return result;
1011
1012 fail:
1013 sysfs_remove_battery(battery);
1014 mutex_destroy(&battery->lock);
1015 mutex_destroy(&battery->sysfs_lock);
1016 kfree(battery);
1017 return result;
1018 }
1019
1020 static int acpi_battery_remove(struct acpi_device *device, int type)
1021 {
1022 struct acpi_battery *battery = NULL;
1023
1024 if (!device || !acpi_driver_data(device))
1025 return -EINVAL;
1026 battery = acpi_driver_data(device);
1027 unregister_pm_notifier(&battery->pm_nb);
1028 #ifdef CONFIG_ACPI_PROCFS_POWER
1029 acpi_battery_remove_fs(device);
1030 #endif
1031 sysfs_remove_battery(battery);
1032 mutex_destroy(&battery->lock);
1033 mutex_destroy(&battery->sysfs_lock);
1034 kfree(battery);
1035 return 0;
1036 }
1037
1038 /* this is needed to learn about changes made in suspended state */
1039 static int acpi_battery_resume(struct acpi_device *device)
1040 {
1041 struct acpi_battery *battery;
1042 if (!device)
1043 return -EINVAL;
1044 battery = acpi_driver_data(device);
1045 battery->update_time = 0;
1046 acpi_battery_update(battery);
1047 return 0;
1048 }
1049
1050 static struct acpi_driver acpi_battery_driver = {
1051 .name = "battery",
1052 .class = ACPI_BATTERY_CLASS,
1053 .ids = battery_device_ids,
1054 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1055 .ops = {
1056 .add = acpi_battery_add,
1057 .resume = acpi_battery_resume,
1058 .remove = acpi_battery_remove,
1059 .notify = acpi_battery_notify,
1060 },
1061 };
1062
1063 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1064 {
1065 if (acpi_disabled)
1066 return;
1067 #ifdef CONFIG_ACPI_PROCFS_POWER
1068 acpi_battery_dir = acpi_lock_battery_dir();
1069 if (!acpi_battery_dir)
1070 return;
1071 #endif
1072 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1073 #ifdef CONFIG_ACPI_PROCFS_POWER
1074 acpi_unlock_battery_dir(acpi_battery_dir);
1075 #endif
1076 return;
1077 }
1078 return;
1079 }
1080
1081 static int __init acpi_battery_init(void)
1082 {
1083 async_schedule(acpi_battery_init_async, NULL);
1084 return 0;
1085 }
1086
1087 static void __exit acpi_battery_exit(void)
1088 {
1089 acpi_bus_unregister_driver(&acpi_battery_driver);
1090 #ifdef CONFIG_ACPI_PROCFS_POWER
1091 acpi_unlock_battery_dir(acpi_battery_dir);
1092 #endif
1093 }
1094
1095 module_init(acpi_battery_init);
1096 module_exit(acpi_battery_exit);
Linux with added FPC-III support