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Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / drivers / acpi / battery.c
blob9fb9d5ac939db1c071c4cdcaa7fba49364236e25
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 static int acpi_battery_update(struct acpi_battery *battery);
134
135 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
136
137 inline int acpi_battery_present(struct acpi_battery *battery)
138 {
139 return battery->device->status.battery_present;
140 }
141
142 static int acpi_battery_technology(struct acpi_battery *battery)
143 {
144 if (!strcasecmp("NiCd", battery->type))
145 return POWER_SUPPLY_TECHNOLOGY_NiCd;
146 if (!strcasecmp("NiMH", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_NiMH;
148 if (!strcasecmp("LION", battery->type))
149 return POWER_SUPPLY_TECHNOLOGY_LION;
150 if (!strncasecmp("LI-ION", battery->type, 6))
151 return POWER_SUPPLY_TECHNOLOGY_LION;
152 if (!strcasecmp("LiP", battery->type))
153 return POWER_SUPPLY_TECHNOLOGY_LIPO;
154 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
155 }
156
157 static int acpi_battery_get_state(struct acpi_battery *battery);
158
159 static int acpi_battery_is_charged(struct acpi_battery *battery)
160 {
161 /* either charging or discharging */
162 if (battery->state != 0)
163 return 0;
164
165 /* battery not reporting charge */
166 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
167 battery->capacity_now == 0)
168 return 0;
169
170 /* good batteries update full_charge as the batteries degrade */
171 if (battery->full_charge_capacity == battery->capacity_now)
172 return 1;
173
174 /* fallback to using design values for broken batteries */
175 if (battery->design_capacity == battery->capacity_now)
176 return 1;
177
178 /* we don't do any sort of metric based on percentages */
179 return 0;
180 }
181
182 static int acpi_battery_get_property(struct power_supply *psy,
183 enum power_supply_property psp,
184 union power_supply_propval *val)
185 {
186 int ret = 0;
187 struct acpi_battery *battery = to_acpi_battery(psy);
188
189 if (acpi_battery_update(battery))
190 return -ENODEV;
191
192 if (acpi_battery_present(battery)) {
193 /* run battery update only if it is present */
194 acpi_battery_get_state(battery);
195 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
196 return -ENODEV;
197 switch (psp) {
198 case POWER_SUPPLY_PROP_STATUS:
199 if (battery->state & 0x01)
200 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
201 else if (battery->state & 0x02)
202 val->intval = POWER_SUPPLY_STATUS_CHARGING;
203 else if (acpi_battery_is_charged(battery))
204 val->intval = POWER_SUPPLY_STATUS_FULL;
205 else
206 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
207 break;
208 case POWER_SUPPLY_PROP_PRESENT:
209 val->intval = acpi_battery_present(battery);
210 break;
211 case POWER_SUPPLY_PROP_TECHNOLOGY:
212 val->intval = acpi_battery_technology(battery);
213 break;
214 case POWER_SUPPLY_PROP_CYCLE_COUNT:
215 val->intval = battery->cycle_count;
216 break;
217 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
218 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
219 ret = -ENODEV;
220 else
221 val->intval = battery->design_voltage * 1000;
222 break;
223 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
224 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
225 ret = -ENODEV;
226 else
227 val->intval = battery->voltage_now * 1000;
228 break;
229 case POWER_SUPPLY_PROP_CURRENT_NOW:
230 case POWER_SUPPLY_PROP_POWER_NOW:
231 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
232 ret = -ENODEV;
233 else
234 val->intval = battery->rate_now * 1000;
235 break;
236 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
237 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
238 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
239 ret = -ENODEV;
240 else
241 val->intval = battery->design_capacity * 1000;
242 break;
243 case POWER_SUPPLY_PROP_CHARGE_FULL:
244 case POWER_SUPPLY_PROP_ENERGY_FULL:
245 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
246 ret = -ENODEV;
247 else
248 val->intval = battery->full_charge_capacity * 1000;
249 break;
250 case POWER_SUPPLY_PROP_CHARGE_NOW:
251 case POWER_SUPPLY_PROP_ENERGY_NOW:
252 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
253 ret = -ENODEV;
254 else
255 val->intval = battery->capacity_now * 1000;
256 break;
257 case POWER_SUPPLY_PROP_MODEL_NAME:
258 val->strval = battery->model_number;
259 break;
260 case POWER_SUPPLY_PROP_MANUFACTURER:
261 val->strval = battery->oem_info;
262 break;
263 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
264 val->strval = battery->serial_number;
265 break;
266 default:
267 ret = -EINVAL;
268 }
269 return ret;
270 }
271
272 static enum power_supply_property charge_battery_props[] = {
273 POWER_SUPPLY_PROP_STATUS,
274 POWER_SUPPLY_PROP_PRESENT,
275 POWER_SUPPLY_PROP_TECHNOLOGY,
276 POWER_SUPPLY_PROP_CYCLE_COUNT,
277 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
278 POWER_SUPPLY_PROP_VOLTAGE_NOW,
279 POWER_SUPPLY_PROP_CURRENT_NOW,
280 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
281 POWER_SUPPLY_PROP_CHARGE_FULL,
282 POWER_SUPPLY_PROP_CHARGE_NOW,
283 POWER_SUPPLY_PROP_MODEL_NAME,
284 POWER_SUPPLY_PROP_MANUFACTURER,
285 POWER_SUPPLY_PROP_SERIAL_NUMBER,
286 };
287
288 static enum power_supply_property energy_battery_props[] = {
289 POWER_SUPPLY_PROP_STATUS,
290 POWER_SUPPLY_PROP_PRESENT,
291 POWER_SUPPLY_PROP_TECHNOLOGY,
292 POWER_SUPPLY_PROP_CYCLE_COUNT,
293 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
294 POWER_SUPPLY_PROP_VOLTAGE_NOW,
295 POWER_SUPPLY_PROP_POWER_NOW,
296 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
297 POWER_SUPPLY_PROP_ENERGY_FULL,
298 POWER_SUPPLY_PROP_ENERGY_NOW,
299 POWER_SUPPLY_PROP_MODEL_NAME,
300 POWER_SUPPLY_PROP_MANUFACTURER,
301 POWER_SUPPLY_PROP_SERIAL_NUMBER,
302 };
303
304 #ifdef CONFIG_ACPI_PROCFS_POWER
305 inline char *acpi_battery_units(struct acpi_battery *battery)
306 {
307 return (battery->power_unit)?"mA":"mW";
308 }
309 #endif
310
311 /* --------------------------------------------------------------------------
312 Battery Management
313 -------------------------------------------------------------------------- */
314 struct acpi_offsets {
315 size_t offset; /* offset inside struct acpi_sbs_battery */
316 u8 mode; /* int or string? */
317 };
318
319 static struct acpi_offsets state_offsets[] = {
320 {offsetof(struct acpi_battery, state), 0},
321 {offsetof(struct acpi_battery, rate_now), 0},
322 {offsetof(struct acpi_battery, capacity_now), 0},
323 {offsetof(struct acpi_battery, voltage_now), 0},
324 };
325
326 static struct acpi_offsets info_offsets[] = {
327 {offsetof(struct acpi_battery, power_unit), 0},
328 {offsetof(struct acpi_battery, design_capacity), 0},
329 {offsetof(struct acpi_battery, full_charge_capacity), 0},
330 {offsetof(struct acpi_battery, technology), 0},
331 {offsetof(struct acpi_battery, design_voltage), 0},
332 {offsetof(struct acpi_battery, design_capacity_warning), 0},
333 {offsetof(struct acpi_battery, design_capacity_low), 0},
334 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
335 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
336 {offsetof(struct acpi_battery, model_number), 1},
337 {offsetof(struct acpi_battery, serial_number), 1},
338 {offsetof(struct acpi_battery, type), 1},
339 {offsetof(struct acpi_battery, oem_info), 1},
340 };
341
342 static struct acpi_offsets extended_info_offsets[] = {
343 {offsetof(struct acpi_battery, power_unit), 0},
344 {offsetof(struct acpi_battery, design_capacity), 0},
345 {offsetof(struct acpi_battery, full_charge_capacity), 0},
346 {offsetof(struct acpi_battery, technology), 0},
347 {offsetof(struct acpi_battery, design_voltage), 0},
348 {offsetof(struct acpi_battery, design_capacity_warning), 0},
349 {offsetof(struct acpi_battery, design_capacity_low), 0},
350 {offsetof(struct acpi_battery, cycle_count), 0},
351 {offsetof(struct acpi_battery, measurement_accuracy), 0},
352 {offsetof(struct acpi_battery, max_sampling_time), 0},
353 {offsetof(struct acpi_battery, min_sampling_time), 0},
354 {offsetof(struct acpi_battery, max_averaging_interval), 0},
355 {offsetof(struct acpi_battery, min_averaging_interval), 0},
356 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
357 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
358 {offsetof(struct acpi_battery, model_number), 1},
359 {offsetof(struct acpi_battery, serial_number), 1},
360 {offsetof(struct acpi_battery, type), 1},
361 {offsetof(struct acpi_battery, oem_info), 1},
362 };
363
364 static int extract_package(struct acpi_battery *battery,
365 union acpi_object *package,
366 struct acpi_offsets *offsets, int num)
367 {
368 int i;
369 union acpi_object *element;
370 if (package->type != ACPI_TYPE_PACKAGE)
371 return -EFAULT;
372 for (i = 0; i < num; ++i) {
373 if (package->package.count <= i)
374 return -EFAULT;
375 element = &package->package.elements[i];
376 if (offsets[i].mode) {
377 u8 *ptr = (u8 *)battery + offsets[i].offset;
378 if (element->type == ACPI_TYPE_STRING ||
379 element->type == ACPI_TYPE_BUFFER)
380 strncpy(ptr, element->string.pointer, 32);
381 else if (element->type == ACPI_TYPE_INTEGER) {
382 strncpy(ptr, (u8 *)&element->integer.value,
383 sizeof(u64));
384 ptr[sizeof(u64)] = 0;
385 } else
386 *ptr = 0; /* don't have value */
387 } else {
388 int *x = (int *)((u8 *)battery + offsets[i].offset);
389 *x = (element->type == ACPI_TYPE_INTEGER) ?
390 element->integer.value : -1;
391 }
392 }
393 return 0;
394 }
395
396 static int acpi_battery_get_status(struct acpi_battery *battery)
397 {
398 if (acpi_bus_get_status(battery->device)) {
399 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
400 return -ENODEV;
401 }
402 return 0;
403 }
404
405 static int acpi_battery_get_info(struct acpi_battery *battery)
406 {
407 int result = -EFAULT;
408 acpi_status status = 0;
409 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
410 "_BIX" : "_BIF";
411
412 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
413
414 if (!acpi_battery_present(battery))
415 return 0;
416 mutex_lock(&battery->lock);
417 status = acpi_evaluate_object(battery->device->handle, name,
418 NULL, &buffer);
419 mutex_unlock(&battery->lock);
420
421 if (ACPI_FAILURE(status)) {
422 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
423 return -ENODEV;
424 }
425 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
426 result = extract_package(battery, buffer.pointer,
427 extended_info_offsets,
428 ARRAY_SIZE(extended_info_offsets));
429 else
430 result = extract_package(battery, buffer.pointer,
431 info_offsets, ARRAY_SIZE(info_offsets));
432 kfree(buffer.pointer);
433 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
434 battery->full_charge_capacity = battery->design_capacity;
435 return result;
436 }
437
438 static int acpi_battery_get_state(struct acpi_battery *battery)
439 {
440 int result = 0;
441 acpi_status status = 0;
442 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
443
444 if (!acpi_battery_present(battery))
445 return 0;
446
447 if (battery->update_time &&
448 time_before(jiffies, battery->update_time +
449 msecs_to_jiffies(cache_time)))
450 return 0;
451
452 mutex_lock(&battery->lock);
453 status = acpi_evaluate_object(battery->device->handle, "_BST",
454 NULL, &buffer);
455 mutex_unlock(&battery->lock);
456
457 if (ACPI_FAILURE(status)) {
458 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
459 return -ENODEV;
460 }
461
462 result = extract_package(battery, buffer.pointer,
463 state_offsets, ARRAY_SIZE(state_offsets));
464 battery->update_time = jiffies;
465 kfree(buffer.pointer);
466
467 if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
468 battery->rate_now != -1)
469 battery->rate_now = abs((s16)battery->rate_now);
470
471 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
472 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
473 battery->capacity_now = (battery->capacity_now *
474 battery->full_charge_capacity) / 100;
475 return result;
476 }
477
478 static int acpi_battery_set_alarm(struct acpi_battery *battery)
479 {
480 acpi_status status = 0;
481 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
482 struct acpi_object_list arg_list = { 1, &arg0 };
483
484 if (!acpi_battery_present(battery) ||
485 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
486 return -ENODEV;
487
488 arg0.integer.value = battery->alarm;
489
490 mutex_lock(&battery->lock);
491 status = acpi_evaluate_object(battery->device->handle, "_BTP",
492 &arg_list, NULL);
493 mutex_unlock(&battery->lock);
494
495 if (ACPI_FAILURE(status))
496 return -ENODEV;
497
498 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
499 return 0;
500 }
501
502 static int acpi_battery_init_alarm(struct acpi_battery *battery)
503 {
504 acpi_status status = AE_OK;
505 acpi_handle handle = NULL;
506
507 /* See if alarms are supported, and if so, set default */
508 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
509 if (ACPI_FAILURE(status)) {
510 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
511 return 0;
512 }
513 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
514 if (!battery->alarm)
515 battery->alarm = battery->design_capacity_warning;
516 return acpi_battery_set_alarm(battery);
517 }
518
519 static ssize_t acpi_battery_alarm_show(struct device *dev,
520 struct device_attribute *attr,
521 char *buf)
522 {
523 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
524 return sprintf(buf, "%d\n", battery->alarm * 1000);
525 }
526
527 static ssize_t acpi_battery_alarm_store(struct device *dev,
528 struct device_attribute *attr,
529 const char *buf, size_t count)
530 {
531 unsigned long x;
532 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
533 if (sscanf(buf, "%ld\n", &x) == 1)
534 battery->alarm = x/1000;
535 if (acpi_battery_present(battery))
536 acpi_battery_set_alarm(battery);
537 return count;
538 }
539
540 static struct device_attribute alarm_attr = {
541 .attr = {.name = "alarm", .mode = 0644},
542 .show = acpi_battery_alarm_show,
543 .store = acpi_battery_alarm_store,
544 };
545
546 static int sysfs_add_battery(struct acpi_battery *battery)
547 {
548 int result;
549
550 if (battery->power_unit) {
551 battery->bat.properties = charge_battery_props;
552 battery->bat.num_properties =
553 ARRAY_SIZE(charge_battery_props);
554 } else {
555 battery->bat.properties = energy_battery_props;
556 battery->bat.num_properties =
557 ARRAY_SIZE(energy_battery_props);
558 }
559
560 battery->bat.name = acpi_device_bid(battery->device);
561 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
562 battery->bat.get_property = acpi_battery_get_property;
563
564 result = power_supply_register(&battery->device->dev, &battery->bat);
565 if (result)
566 return result;
567 return device_create_file(battery->bat.dev, &alarm_attr);
568 }
569
570 static void sysfs_remove_battery(struct acpi_battery *battery)
571 {
572 if (!battery->bat.dev)
573 return;
574 device_remove_file(battery->bat.dev, &alarm_attr);
575 power_supply_unregister(&battery->bat);
576 battery->bat.dev = NULL;
577 }
578
579 static void acpi_battery_quirks(struct acpi_battery *battery)
580 {
581 if (dmi_name_in_vendors("Acer") && battery->power_unit) {
582 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
583 }
584 }
585
586 /*
587 * According to the ACPI spec, some kinds of primary batteries can
588 * report percentage battery remaining capacity directly to OS.
589 * In this case, it reports the Last Full Charged Capacity == 100
590 * and BatteryPresentRate == 0xFFFFFFFF.
591 *
592 * Now we found some battery reports percentage remaining capacity
593 * even if it's rechargeable.
594 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
595 *
596 * Handle this correctly so that they won't break userspace.
597 */
598 static void acpi_battery_quirks2(struct acpi_battery *battery)
599 {
600 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
601 return ;
602
603 if (battery->full_charge_capacity == 100 &&
604 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
605 battery->capacity_now >=0 && battery->capacity_now <= 100) {
606 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
607 battery->full_charge_capacity = battery->design_capacity;
608 battery->capacity_now = (battery->capacity_now *
609 battery->full_charge_capacity) / 100;
610 }
611 }
612
613 static int acpi_battery_update(struct acpi_battery *battery)
614 {
615 int result, old_present = acpi_battery_present(battery);
616 result = acpi_battery_get_status(battery);
617 if (result)
618 return result;
619 if (!acpi_battery_present(battery)) {
620 sysfs_remove_battery(battery);
621 battery->update_time = 0;
622 return 0;
623 }
624 if (!battery->update_time ||
625 old_present != acpi_battery_present(battery)) {
626 result = acpi_battery_get_info(battery);
627 if (result)
628 return result;
629 acpi_battery_quirks(battery);
630 acpi_battery_init_alarm(battery);
631 }
632 if (!battery->bat.dev)
633 sysfs_add_battery(battery);
634 result = acpi_battery_get_state(battery);
635 acpi_battery_quirks2(battery);
636 return result;
637 }
638
639 /* --------------------------------------------------------------------------
640 FS Interface (/proc)
641 -------------------------------------------------------------------------- */
642
643 #ifdef CONFIG_ACPI_PROCFS_POWER
644 static struct proc_dir_entry *acpi_battery_dir;
645
646 static int acpi_battery_print_info(struct seq_file *seq, int result)
647 {
648 struct acpi_battery *battery = seq->private;
649
650 if (result)
651 goto end;
652
653 seq_printf(seq, "present: %s\n",
654 acpi_battery_present(battery)?"yes":"no");
655 if (!acpi_battery_present(battery))
656 goto end;
657 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
658 seq_printf(seq, "design capacity: unknown\n");
659 else
660 seq_printf(seq, "design capacity: %d %sh\n",
661 battery->design_capacity,
662 acpi_battery_units(battery));
663
664 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
665 seq_printf(seq, "last full capacity: unknown\n");
666 else
667 seq_printf(seq, "last full capacity: %d %sh\n",
668 battery->full_charge_capacity,
669 acpi_battery_units(battery));
670
671 seq_printf(seq, "battery technology: %srechargeable\n",
672 (!battery->technology)?"non-":"");
673
674 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
675 seq_printf(seq, "design voltage: unknown\n");
676 else
677 seq_printf(seq, "design voltage: %d mV\n",
678 battery->design_voltage);
679 seq_printf(seq, "design capacity warning: %d %sh\n",
680 battery->design_capacity_warning,
681 acpi_battery_units(battery));
682 seq_printf(seq, "design capacity low: %d %sh\n",
683 battery->design_capacity_low,
684 acpi_battery_units(battery));
685 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
686 seq_printf(seq, "capacity granularity 1: %d %sh\n",
687 battery->capacity_granularity_1,
688 acpi_battery_units(battery));
689 seq_printf(seq, "capacity granularity 2: %d %sh\n",
690 battery->capacity_granularity_2,
691 acpi_battery_units(battery));
692 seq_printf(seq, "model number: %s\n", battery->model_number);
693 seq_printf(seq, "serial number: %s\n", battery->serial_number);
694 seq_printf(seq, "battery type: %s\n", battery->type);
695 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
696 end:
697 if (result)
698 seq_printf(seq, "ERROR: Unable to read battery info\n");
699 return result;
700 }
701
702 static int acpi_battery_print_state(struct seq_file *seq, int result)
703 {
704 struct acpi_battery *battery = seq->private;
705
706 if (result)
707 goto end;
708
709 seq_printf(seq, "present: %s\n",
710 acpi_battery_present(battery)?"yes":"no");
711 if (!acpi_battery_present(battery))
712 goto end;
713
714 seq_printf(seq, "capacity state: %s\n",
715 (battery->state & 0x04)?"critical":"ok");
716 if ((battery->state & 0x01) && (battery->state & 0x02))
717 seq_printf(seq,
718 "charging state: charging/discharging\n");
719 else if (battery->state & 0x01)
720 seq_printf(seq, "charging state: discharging\n");
721 else if (battery->state & 0x02)
722 seq_printf(seq, "charging state: charging\n");
723 else
724 seq_printf(seq, "charging state: charged\n");
725
726 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
727 seq_printf(seq, "present rate: unknown\n");
728 else
729 seq_printf(seq, "present rate: %d %s\n",
730 battery->rate_now, acpi_battery_units(battery));
731
732 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
733 seq_printf(seq, "remaining capacity: unknown\n");
734 else
735 seq_printf(seq, "remaining capacity: %d %sh\n",
736 battery->capacity_now, acpi_battery_units(battery));
737 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
738 seq_printf(seq, "present voltage: unknown\n");
739 else
740 seq_printf(seq, "present voltage: %d mV\n",
741 battery->voltage_now);
742 end:
743 if (result)
744 seq_printf(seq, "ERROR: Unable to read battery state\n");
745
746 return result;
747 }
748
749 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
750 {
751 struct acpi_battery *battery = seq->private;
752
753 if (result)
754 goto end;
755
756 if (!acpi_battery_present(battery)) {
757 seq_printf(seq, "present: no\n");
758 goto end;
759 }
760 seq_printf(seq, "alarm: ");
761 if (!battery->alarm)
762 seq_printf(seq, "unsupported\n");
763 else
764 seq_printf(seq, "%u %sh\n", battery->alarm,
765 acpi_battery_units(battery));
766 end:
767 if (result)
768 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
769 return result;
770 }
771
772 static ssize_t acpi_battery_write_alarm(struct file *file,
773 const char __user * buffer,
774 size_t count, loff_t * ppos)
775 {
776 int result = 0;
777 char alarm_string[12] = { '\0' };
778 struct seq_file *m = file->private_data;
779 struct acpi_battery *battery = m->private;
780
781 if (!battery || (count > sizeof(alarm_string) - 1))
782 return -EINVAL;
783 if (!acpi_battery_present(battery)) {
784 result = -ENODEV;
785 goto end;
786 }
787 if (copy_from_user(alarm_string, buffer, count)) {
788 result = -EFAULT;
789 goto end;
790 }
791 alarm_string[count] = '\0';
792 battery->alarm = simple_strtol(alarm_string, NULL, 0);
793 result = acpi_battery_set_alarm(battery);
794 end:
795 if (!result)
796 return count;
797 return result;
798 }
799
800 typedef int(*print_func)(struct seq_file *seq, int result);
801
802 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
803 acpi_battery_print_info,
804 acpi_battery_print_state,
805 acpi_battery_print_alarm,
806 };
807
808 static int acpi_battery_read(int fid, struct seq_file *seq)
809 {
810 struct acpi_battery *battery = seq->private;
811 int result = acpi_battery_update(battery);
812 return acpi_print_funcs[fid](seq, result);
813 }
814
815 #define DECLARE_FILE_FUNCTIONS(_name) \
816 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
817 { \
818 return acpi_battery_read(_name##_tag, seq); \
819 } \
820 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
821 { \
822 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
823 }
824
825 DECLARE_FILE_FUNCTIONS(info);
826 DECLARE_FILE_FUNCTIONS(state);
827 DECLARE_FILE_FUNCTIONS(alarm);
828
829 #undef DECLARE_FILE_FUNCTIONS
830
831 #define FILE_DESCRIPTION_RO(_name) \
832 { \
833 .name = __stringify(_name), \
834 .mode = S_IRUGO, \
835 .ops = { \
836 .open = acpi_battery_##_name##_open_fs, \
837 .read = seq_read, \
838 .llseek = seq_lseek, \
839 .release = single_release, \
840 .owner = THIS_MODULE, \
841 }, \
842 }
843
844 #define FILE_DESCRIPTION_RW(_name) \
845 { \
846 .name = __stringify(_name), \
847 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
848 .ops = { \
849 .open = acpi_battery_##_name##_open_fs, \
850 .read = seq_read, \
851 .llseek = seq_lseek, \
852 .write = acpi_battery_write_##_name, \
853 .release = single_release, \
854 .owner = THIS_MODULE, \
855 }, \
856 }
857
858 static struct battery_file {
859 struct file_operations ops;
860 mode_t mode;
861 const char *name;
862 } acpi_battery_file[] = {
863 FILE_DESCRIPTION_RO(info),
864 FILE_DESCRIPTION_RO(state),
865 FILE_DESCRIPTION_RW(alarm),
866 };
867
868 #undef FILE_DESCRIPTION_RO
869 #undef FILE_DESCRIPTION_RW
870
871 static int acpi_battery_add_fs(struct acpi_device *device)
872 {
873 struct proc_dir_entry *entry = NULL;
874 int i;
875
876 if (!acpi_device_dir(device)) {
877 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
878 acpi_battery_dir);
879 if (!acpi_device_dir(device))
880 return -ENODEV;
881 }
882
883 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
884 entry = proc_create_data(acpi_battery_file[i].name,
885 acpi_battery_file[i].mode,
886 acpi_device_dir(device),
887 &acpi_battery_file[i].ops,
888 acpi_driver_data(device));
889 if (!entry)
890 return -ENODEV;
891 }
892 return 0;
893 }
894
895 static void acpi_battery_remove_fs(struct acpi_device *device)
896 {
897 int i;
898 if (!acpi_device_dir(device))
899 return;
900 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
901 remove_proc_entry(acpi_battery_file[i].name,
902 acpi_device_dir(device));
903
904 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
905 acpi_device_dir(device) = NULL;
906 }
907
908 #endif
909
910 /* --------------------------------------------------------------------------
911 Driver Interface
912 -------------------------------------------------------------------------- */
913
914 static void acpi_battery_notify(struct acpi_device *device, u32 event)
915 {
916 struct acpi_battery *battery = acpi_driver_data(device);
917 struct device *old;
918
919 if (!battery)
920 return;
921 old = battery->bat.dev;
922 acpi_battery_update(battery);
923 acpi_bus_generate_proc_event(device, event,
924 acpi_battery_present(battery));
925 acpi_bus_generate_netlink_event(device->pnp.device_class,
926 dev_name(&device->dev), event,
927 acpi_battery_present(battery));
928 /* acpi_battery_update could remove power_supply object */
929 if (old && battery->bat.dev)
930 power_supply_changed(&battery->bat);
931 }
932
933 static int acpi_battery_add(struct acpi_device *device)
934 {
935 int result = 0;
936 struct acpi_battery *battery = NULL;
937 acpi_handle handle;
938 if (!device)
939 return -EINVAL;
940 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
941 if (!battery)
942 return -ENOMEM;
943 battery->device = device;
944 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
945 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
946 device->driver_data = battery;
947 mutex_init(&battery->lock);
948 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
949 "_BIX", &handle)))
950 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
951 acpi_battery_update(battery);
952 #ifdef CONFIG_ACPI_PROCFS_POWER
953 result = acpi_battery_add_fs(device);
954 #endif
955 if (!result) {
956 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
957 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
958 device->status.battery_present ? "present" : "absent");
959 } else {
960 #ifdef CONFIG_ACPI_PROCFS_POWER
961 acpi_battery_remove_fs(device);
962 #endif
963 kfree(battery);
964 }
965 return result;
966 }
967
968 static int acpi_battery_remove(struct acpi_device *device, int type)
969 {
970 struct acpi_battery *battery = NULL;
971
972 if (!device || !acpi_driver_data(device))
973 return -EINVAL;
974 battery = acpi_driver_data(device);
975 #ifdef CONFIG_ACPI_PROCFS_POWER
976 acpi_battery_remove_fs(device);
977 #endif
978 sysfs_remove_battery(battery);
979 mutex_destroy(&battery->lock);
980 kfree(battery);
981 return 0;
982 }
983
984 /* this is needed to learn about changes made in suspended state */
985 static int acpi_battery_resume(struct acpi_device *device)
986 {
987 struct acpi_battery *battery;
988 if (!device)
989 return -EINVAL;
990 battery = acpi_driver_data(device);
991 battery->update_time = 0;
992 acpi_battery_update(battery);
993 return 0;
994 }
995
996 static struct acpi_driver acpi_battery_driver = {
997 .name = "battery",
998 .class = ACPI_BATTERY_CLASS,
999 .ids = battery_device_ids,
1000 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1001 .ops = {
1002 .add = acpi_battery_add,
1003 .resume = acpi_battery_resume,
1004 .remove = acpi_battery_remove,
1005 .notify = acpi_battery_notify,
1006 },
1007 };
1008
1009 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1010 {
1011 if (acpi_disabled)
1012 return;
1013 #ifdef CONFIG_ACPI_PROCFS_POWER
1014 acpi_battery_dir = acpi_lock_battery_dir();
1015 if (!acpi_battery_dir)
1016 return;
1017 #endif
1018 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1019 #ifdef CONFIG_ACPI_PROCFS_POWER
1020 acpi_unlock_battery_dir(acpi_battery_dir);
1021 #endif
1022 return;
1023 }
1024 return;
1025 }
1026
1027 static int __init acpi_battery_init(void)
1028 {
1029 async_schedule(acpi_battery_init_async, NULL);
1030 return 0;
1031 }
1032
1033 static void __exit acpi_battery_exit(void)
1034 {
1035 acpi_bus_unregister_driver(&acpi_battery_driver);
1036 #ifdef CONFIG_ACPI_PROCFS_POWER
1037 acpi_unlock_battery_dir(acpi_battery_dir);
1038 #endif
1039 }
1040
1041 module_init(acpi_battery_init);
1042 module_exit(acpi_battery_exit);
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