Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
[linux-3.10.git] / drivers / acpi / battery.c
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_CAPACITY:
254                 if (battery->capacity_now && battery->full_charge_capacity)
255                         val->intval = battery->capacity_now * 100/
256                                         battery->full_charge_capacity;
257                 else
258                         val->intval = 0;
259                 break;
260         case POWER_SUPPLY_PROP_MODEL_NAME:
261                 val->strval = battery->model_number;
262                 break;
263         case POWER_SUPPLY_PROP_MANUFACTURER:
264                 val->strval = battery->oem_info;
265                 break;
266         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
267                 val->strval = battery->serial_number;
268                 break;
269         default:
270                 ret = -EINVAL;
271         }
272         return ret;
273 }
274
275 static enum power_supply_property charge_battery_props[] = {
276         POWER_SUPPLY_PROP_STATUS,
277         POWER_SUPPLY_PROP_PRESENT,
278         POWER_SUPPLY_PROP_TECHNOLOGY,
279         POWER_SUPPLY_PROP_CYCLE_COUNT,
280         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
281         POWER_SUPPLY_PROP_VOLTAGE_NOW,
282         POWER_SUPPLY_PROP_CURRENT_NOW,
283         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
284         POWER_SUPPLY_PROP_CHARGE_FULL,
285         POWER_SUPPLY_PROP_CHARGE_NOW,
286         POWER_SUPPLY_PROP_CAPACITY,
287         POWER_SUPPLY_PROP_MODEL_NAME,
288         POWER_SUPPLY_PROP_MANUFACTURER,
289         POWER_SUPPLY_PROP_SERIAL_NUMBER,
290 };
291
292 static enum power_supply_property energy_battery_props[] = {
293         POWER_SUPPLY_PROP_STATUS,
294         POWER_SUPPLY_PROP_PRESENT,
295         POWER_SUPPLY_PROP_TECHNOLOGY,
296         POWER_SUPPLY_PROP_CYCLE_COUNT,
297         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
298         POWER_SUPPLY_PROP_VOLTAGE_NOW,
299         POWER_SUPPLY_PROP_POWER_NOW,
300         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
301         POWER_SUPPLY_PROP_ENERGY_FULL,
302         POWER_SUPPLY_PROP_ENERGY_NOW,
303         POWER_SUPPLY_PROP_CAPACITY,
304         POWER_SUPPLY_PROP_MODEL_NAME,
305         POWER_SUPPLY_PROP_MANUFACTURER,
306         POWER_SUPPLY_PROP_SERIAL_NUMBER,
307 };
308
309 #ifdef CONFIG_ACPI_PROCFS_POWER
310 inline char *acpi_battery_units(struct acpi_battery *battery)
311 {
312         return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
313                 "mA" : "mW";
314 }
315 #endif
316
317 /* --------------------------------------------------------------------------
318                                Battery Management
319    -------------------------------------------------------------------------- */
320 struct acpi_offsets {
321         size_t offset;          /* offset inside struct acpi_sbs_battery */
322         u8 mode;                /* int or string? */
323 };
324
325 static struct acpi_offsets state_offsets[] = {
326         {offsetof(struct acpi_battery, state), 0},
327         {offsetof(struct acpi_battery, rate_now), 0},
328         {offsetof(struct acpi_battery, capacity_now), 0},
329         {offsetof(struct acpi_battery, voltage_now), 0},
330 };
331
332 static struct acpi_offsets info_offsets[] = {
333         {offsetof(struct acpi_battery, power_unit), 0},
334         {offsetof(struct acpi_battery, design_capacity), 0},
335         {offsetof(struct acpi_battery, full_charge_capacity), 0},
336         {offsetof(struct acpi_battery, technology), 0},
337         {offsetof(struct acpi_battery, design_voltage), 0},
338         {offsetof(struct acpi_battery, design_capacity_warning), 0},
339         {offsetof(struct acpi_battery, design_capacity_low), 0},
340         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
341         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
342         {offsetof(struct acpi_battery, model_number), 1},
343         {offsetof(struct acpi_battery, serial_number), 1},
344         {offsetof(struct acpi_battery, type), 1},
345         {offsetof(struct acpi_battery, oem_info), 1},
346 };
347
348 static struct acpi_offsets extended_info_offsets[] = {
349         {offsetof(struct acpi_battery, power_unit), 0},
350         {offsetof(struct acpi_battery, design_capacity), 0},
351         {offsetof(struct acpi_battery, full_charge_capacity), 0},
352         {offsetof(struct acpi_battery, technology), 0},
353         {offsetof(struct acpi_battery, design_voltage), 0},
354         {offsetof(struct acpi_battery, design_capacity_warning), 0},
355         {offsetof(struct acpi_battery, design_capacity_low), 0},
356         {offsetof(struct acpi_battery, cycle_count), 0},
357         {offsetof(struct acpi_battery, measurement_accuracy), 0},
358         {offsetof(struct acpi_battery, max_sampling_time), 0},
359         {offsetof(struct acpi_battery, min_sampling_time), 0},
360         {offsetof(struct acpi_battery, max_averaging_interval), 0},
361         {offsetof(struct acpi_battery, min_averaging_interval), 0},
362         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
363         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
364         {offsetof(struct acpi_battery, model_number), 1},
365         {offsetof(struct acpi_battery, serial_number), 1},
366         {offsetof(struct acpi_battery, type), 1},
367         {offsetof(struct acpi_battery, oem_info), 1},
368 };
369
370 static int extract_package(struct acpi_battery *battery,
371                            union acpi_object *package,
372                            struct acpi_offsets *offsets, int num)
373 {
374         int i;
375         union acpi_object *element;
376         if (package->type != ACPI_TYPE_PACKAGE)
377                 return -EFAULT;
378         for (i = 0; i < num; ++i) {
379                 if (package->package.count <= i)
380                         return -EFAULT;
381                 element = &package->package.elements[i];
382                 if (offsets[i].mode) {
383                         u8 *ptr = (u8 *)battery + offsets[i].offset;
384                         if (element->type == ACPI_TYPE_STRING ||
385                             element->type == ACPI_TYPE_BUFFER)
386                                 strncpy(ptr, element->string.pointer, 32);
387                         else if (element->type == ACPI_TYPE_INTEGER) {
388                                 strncpy(ptr, (u8 *)&element->integer.value,
389                                         sizeof(u64));
390                                 ptr[sizeof(u64)] = 0;
391                         } else
392                                 *ptr = 0; /* don't have value */
393                 } else {
394                         int *x = (int *)((u8 *)battery + offsets[i].offset);
395                         *x = (element->type == ACPI_TYPE_INTEGER) ?
396                                 element->integer.value : -1;
397                 }
398         }
399         return 0;
400 }
401
402 static int acpi_battery_get_status(struct acpi_battery *battery)
403 {
404         if (acpi_bus_get_status(battery->device)) {
405                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
406                 return -ENODEV;
407         }
408         return 0;
409 }
410
411 static int acpi_battery_get_info(struct acpi_battery *battery)
412 {
413         int result = -EFAULT;
414         acpi_status status = 0;
415         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
416                         "_BIX" : "_BIF";
417
418         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
419
420         if (!acpi_battery_present(battery))
421                 return 0;
422         mutex_lock(&battery->lock);
423         status = acpi_evaluate_object(battery->device->handle, name,
424                                                 NULL, &buffer);
425         mutex_unlock(&battery->lock);
426
427         if (ACPI_FAILURE(status)) {
428                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
429                 return -ENODEV;
430         }
431         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
432                 result = extract_package(battery, buffer.pointer,
433                                 extended_info_offsets,
434                                 ARRAY_SIZE(extended_info_offsets));
435         else
436                 result = extract_package(battery, buffer.pointer,
437                                 info_offsets, ARRAY_SIZE(info_offsets));
438         kfree(buffer.pointer);
439         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
440                 battery->full_charge_capacity = battery->design_capacity;
441         return result;
442 }
443
444 static int acpi_battery_get_state(struct acpi_battery *battery)
445 {
446         int result = 0;
447         acpi_status status = 0;
448         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
449
450         if (!acpi_battery_present(battery))
451                 return 0;
452
453         if (battery->update_time &&
454             time_before(jiffies, battery->update_time +
455                         msecs_to_jiffies(cache_time)))
456                 return 0;
457
458         mutex_lock(&battery->lock);
459         status = acpi_evaluate_object(battery->device->handle, "_BST",
460                                       NULL, &buffer);
461         mutex_unlock(&battery->lock);
462
463         if (ACPI_FAILURE(status)) {
464                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
465                 return -ENODEV;
466         }
467
468         result = extract_package(battery, buffer.pointer,
469                                  state_offsets, ARRAY_SIZE(state_offsets));
470         battery->update_time = jiffies;
471         kfree(buffer.pointer);
472
473         /* For buggy DSDTs that report negative 16-bit values for either
474          * charging or discharging current and/or report 0 as 65536
475          * due to bad math.
476          */
477         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
478                 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
479                 (s16)(battery->rate_now) < 0) {
480                 battery->rate_now = abs((s16)battery->rate_now);
481                 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
482                         " invalid.\n");
483         }
484
485         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
486             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
487                 battery->capacity_now = (battery->capacity_now *
488                                 battery->full_charge_capacity) / 100;
489         return result;
490 }
491
492 static int acpi_battery_set_alarm(struct acpi_battery *battery)
493 {
494         acpi_status status = 0;
495         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
496         struct acpi_object_list arg_list = { 1, &arg0 };
497
498         if (!acpi_battery_present(battery) ||
499             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
500                 return -ENODEV;
501
502         arg0.integer.value = battery->alarm;
503
504         mutex_lock(&battery->lock);
505         status = acpi_evaluate_object(battery->device->handle, "_BTP",
506                                  &arg_list, NULL);
507         mutex_unlock(&battery->lock);
508
509         if (ACPI_FAILURE(status))
510                 return -ENODEV;
511
512         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
513         return 0;
514 }
515
516 static int acpi_battery_init_alarm(struct acpi_battery *battery)
517 {
518         acpi_status status = AE_OK;
519         acpi_handle handle = NULL;
520
521         /* See if alarms are supported, and if so, set default */
522         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
523         if (ACPI_FAILURE(status)) {
524                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
525                 return 0;
526         }
527         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
528         if (!battery->alarm)
529                 battery->alarm = battery->design_capacity_warning;
530         return acpi_battery_set_alarm(battery);
531 }
532
533 static ssize_t acpi_battery_alarm_show(struct device *dev,
534                                         struct device_attribute *attr,
535                                         char *buf)
536 {
537         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
538         return sprintf(buf, "%d\n", battery->alarm * 1000);
539 }
540
541 static ssize_t acpi_battery_alarm_store(struct device *dev,
542                                         struct device_attribute *attr,
543                                         const char *buf, size_t count)
544 {
545         unsigned long x;
546         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
547         if (sscanf(buf, "%ld\n", &x) == 1)
548                 battery->alarm = x/1000;
549         if (acpi_battery_present(battery))
550                 acpi_battery_set_alarm(battery);
551         return count;
552 }
553
554 static struct device_attribute alarm_attr = {
555         .attr = {.name = "alarm", .mode = 0644},
556         .show = acpi_battery_alarm_show,
557         .store = acpi_battery_alarm_store,
558 };
559
560 static int sysfs_add_battery(struct acpi_battery *battery)
561 {
562         int result;
563
564         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
565                 battery->bat.properties = charge_battery_props;
566                 battery->bat.num_properties =
567                         ARRAY_SIZE(charge_battery_props);
568         } else {
569                 battery->bat.properties = energy_battery_props;
570                 battery->bat.num_properties =
571                         ARRAY_SIZE(energy_battery_props);
572         }
573
574         battery->bat.name = acpi_device_bid(battery->device);
575         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
576         battery->bat.get_property = acpi_battery_get_property;
577
578         result = power_supply_register(&battery->device->dev, &battery->bat);
579         if (result)
580                 return result;
581         return device_create_file(battery->bat.dev, &alarm_attr);
582 }
583
584 static void sysfs_remove_battery(struct acpi_battery *battery)
585 {
586         mutex_lock(&battery->sysfs_lock);
587         if (!battery->bat.dev) {
588                 mutex_unlock(&battery->sysfs_lock);
589                 return;
590         }
591
592         device_remove_file(battery->bat.dev, &alarm_attr);
593         power_supply_unregister(&battery->bat);
594         battery->bat.dev = NULL;
595         mutex_unlock(&battery->sysfs_lock);
596 }
597
598 /*
599  * According to the ACPI spec, some kinds of primary batteries can
600  * report percentage battery remaining capacity directly to OS.
601  * In this case, it reports the Last Full Charged Capacity == 100
602  * and BatteryPresentRate == 0xFFFFFFFF.
603  *
604  * Now we found some battery reports percentage remaining capacity
605  * even if it's rechargeable.
606  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
607  *
608  * Handle this correctly so that they won't break userspace.
609  */
610 static void acpi_battery_quirks(struct acpi_battery *battery)
611 {
612         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
613                 return ;
614
615         if (battery->full_charge_capacity == 100 &&
616             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
617             battery->capacity_now >=0 && battery->capacity_now <= 100) {
618                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
619                 battery->full_charge_capacity = battery->design_capacity;
620                 battery->capacity_now = (battery->capacity_now *
621                                 battery->full_charge_capacity) / 100;
622         }
623 }
624
625 static int acpi_battery_update(struct acpi_battery *battery)
626 {
627         int result, old_present = acpi_battery_present(battery);
628         result = acpi_battery_get_status(battery);
629         if (result)
630                 return result;
631         if (!acpi_battery_present(battery)) {
632                 sysfs_remove_battery(battery);
633                 battery->update_time = 0;
634                 return 0;
635         }
636         if (!battery->update_time ||
637             old_present != acpi_battery_present(battery)) {
638                 result = acpi_battery_get_info(battery);
639                 if (result)
640                         return result;
641                 acpi_battery_init_alarm(battery);
642         }
643         if (!battery->bat.dev) {
644                 result = sysfs_add_battery(battery);
645                 if (result)
646                         return result;
647         }
648         result = acpi_battery_get_state(battery);
649         acpi_battery_quirks(battery);
650         return result;
651 }
652
653 static void acpi_battery_refresh(struct acpi_battery *battery)
654 {
655         int power_unit;
656
657         if (!battery->bat.dev)
658                 return;
659
660         power_unit = battery->power_unit;
661
662         acpi_battery_get_info(battery);
663
664         if (power_unit == battery->power_unit)
665                 return;
666
667         /* The battery has changed its reporting units. */
668         sysfs_remove_battery(battery);
669         sysfs_add_battery(battery);
670 }
671
672 /* --------------------------------------------------------------------------
673                               FS Interface (/proc)
674    -------------------------------------------------------------------------- */
675
676 #ifdef CONFIG_ACPI_PROCFS_POWER
677 static struct proc_dir_entry *acpi_battery_dir;
678
679 static int acpi_battery_print_info(struct seq_file *seq, int result)
680 {
681         struct acpi_battery *battery = seq->private;
682
683         if (result)
684                 goto end;
685
686         seq_printf(seq, "present:                 %s\n",
687                    acpi_battery_present(battery)?"yes":"no");
688         if (!acpi_battery_present(battery))
689                 goto end;
690         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
691                 seq_printf(seq, "design capacity:         unknown\n");
692         else
693                 seq_printf(seq, "design capacity:         %d %sh\n",
694                            battery->design_capacity,
695                            acpi_battery_units(battery));
696
697         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
698                 seq_printf(seq, "last full capacity:      unknown\n");
699         else
700                 seq_printf(seq, "last full capacity:      %d %sh\n",
701                            battery->full_charge_capacity,
702                            acpi_battery_units(battery));
703
704         seq_printf(seq, "battery technology:      %srechargeable\n",
705                    (!battery->technology)?"non-":"");
706
707         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
708                 seq_printf(seq, "design voltage:          unknown\n");
709         else
710                 seq_printf(seq, "design voltage:          %d mV\n",
711                            battery->design_voltage);
712         seq_printf(seq, "design capacity warning: %d %sh\n",
713                    battery->design_capacity_warning,
714                    acpi_battery_units(battery));
715         seq_printf(seq, "design capacity low:     %d %sh\n",
716                    battery->design_capacity_low,
717                    acpi_battery_units(battery));
718         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
719         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
720                    battery->capacity_granularity_1,
721                    acpi_battery_units(battery));
722         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
723                    battery->capacity_granularity_2,
724                    acpi_battery_units(battery));
725         seq_printf(seq, "model number:            %s\n", battery->model_number);
726         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
727         seq_printf(seq, "battery type:            %s\n", battery->type);
728         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
729       end:
730         if (result)
731                 seq_printf(seq, "ERROR: Unable to read battery info\n");
732         return result;
733 }
734
735 static int acpi_battery_print_state(struct seq_file *seq, int result)
736 {
737         struct acpi_battery *battery = seq->private;
738
739         if (result)
740                 goto end;
741
742         seq_printf(seq, "present:                 %s\n",
743                    acpi_battery_present(battery)?"yes":"no");
744         if (!acpi_battery_present(battery))
745                 goto end;
746
747         seq_printf(seq, "capacity state:          %s\n",
748                         (battery->state & 0x04)?"critical":"ok");
749         if ((battery->state & 0x01) && (battery->state & 0x02))
750                 seq_printf(seq,
751                            "charging state:          charging/discharging\n");
752         else if (battery->state & 0x01)
753                 seq_printf(seq, "charging state:          discharging\n");
754         else if (battery->state & 0x02)
755                 seq_printf(seq, "charging state:          charging\n");
756         else
757                 seq_printf(seq, "charging state:          charged\n");
758
759         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
760                 seq_printf(seq, "present rate:            unknown\n");
761         else
762                 seq_printf(seq, "present rate:            %d %s\n",
763                            battery->rate_now, acpi_battery_units(battery));
764
765         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
766                 seq_printf(seq, "remaining capacity:      unknown\n");
767         else
768                 seq_printf(seq, "remaining capacity:      %d %sh\n",
769                            battery->capacity_now, acpi_battery_units(battery));
770         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
771                 seq_printf(seq, "present voltage:         unknown\n");
772         else
773                 seq_printf(seq, "present voltage:         %d mV\n",
774                            battery->voltage_now);
775       end:
776         if (result)
777                 seq_printf(seq, "ERROR: Unable to read battery state\n");
778
779         return result;
780 }
781
782 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
783 {
784         struct acpi_battery *battery = seq->private;
785
786         if (result)
787                 goto end;
788
789         if (!acpi_battery_present(battery)) {
790                 seq_printf(seq, "present:                 no\n");
791                 goto end;
792         }
793         seq_printf(seq, "alarm:                   ");
794         if (!battery->alarm)
795                 seq_printf(seq, "unsupported\n");
796         else
797                 seq_printf(seq, "%u %sh\n", battery->alarm,
798                                 acpi_battery_units(battery));
799       end:
800         if (result)
801                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
802         return result;
803 }
804
805 static ssize_t acpi_battery_write_alarm(struct file *file,
806                                         const char __user * buffer,
807                                         size_t count, loff_t * ppos)
808 {
809         int result = 0;
810         char alarm_string[12] = { '\0' };
811         struct seq_file *m = file->private_data;
812         struct acpi_battery *battery = m->private;
813
814         if (!battery || (count > sizeof(alarm_string) - 1))
815                 return -EINVAL;
816         if (!acpi_battery_present(battery)) {
817                 result = -ENODEV;
818                 goto end;
819         }
820         if (copy_from_user(alarm_string, buffer, count)) {
821                 result = -EFAULT;
822                 goto end;
823         }
824         alarm_string[count] = '\0';
825         battery->alarm = simple_strtol(alarm_string, NULL, 0);
826         result = acpi_battery_set_alarm(battery);
827       end:
828         if (!result)
829                 return count;
830         return result;
831 }
832
833 typedef int(*print_func)(struct seq_file *seq, int result);
834
835 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
836         acpi_battery_print_info,
837         acpi_battery_print_state,
838         acpi_battery_print_alarm,
839 };
840
841 static int acpi_battery_read(int fid, struct seq_file *seq)
842 {
843         struct acpi_battery *battery = seq->private;
844         int result = acpi_battery_update(battery);
845         return acpi_print_funcs[fid](seq, result);
846 }
847
848 #define DECLARE_FILE_FUNCTIONS(_name) \
849 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
850 { \
851         return acpi_battery_read(_name##_tag, seq); \
852 } \
853 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
854 { \
855         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
856 }
857
858 DECLARE_FILE_FUNCTIONS(info);
859 DECLARE_FILE_FUNCTIONS(state);
860 DECLARE_FILE_FUNCTIONS(alarm);
861
862 #undef DECLARE_FILE_FUNCTIONS
863
864 #define FILE_DESCRIPTION_RO(_name) \
865         { \
866         .name = __stringify(_name), \
867         .mode = S_IRUGO, \
868         .ops = { \
869                 .open = acpi_battery_##_name##_open_fs, \
870                 .read = seq_read, \
871                 .llseek = seq_lseek, \
872                 .release = single_release, \
873                 .owner = THIS_MODULE, \
874                 }, \
875         }
876
877 #define FILE_DESCRIPTION_RW(_name) \
878         { \
879         .name = __stringify(_name), \
880         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
881         .ops = { \
882                 .open = acpi_battery_##_name##_open_fs, \
883                 .read = seq_read, \
884                 .llseek = seq_lseek, \
885                 .write = acpi_battery_write_##_name, \
886                 .release = single_release, \
887                 .owner = THIS_MODULE, \
888                 }, \
889         }
890
891 static const struct battery_file {
892         struct file_operations ops;
893         umode_t mode;
894         const char *name;
895 } acpi_battery_file[] = {
896         FILE_DESCRIPTION_RO(info),
897         FILE_DESCRIPTION_RO(state),
898         FILE_DESCRIPTION_RW(alarm),
899 };
900
901 #undef FILE_DESCRIPTION_RO
902 #undef FILE_DESCRIPTION_RW
903
904 static int acpi_battery_add_fs(struct acpi_device *device)
905 {
906         struct proc_dir_entry *entry = NULL;
907         int i;
908
909         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
910                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
911         if (!acpi_device_dir(device)) {
912                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
913                                                      acpi_battery_dir);
914                 if (!acpi_device_dir(device))
915                         return -ENODEV;
916         }
917
918         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
919                 entry = proc_create_data(acpi_battery_file[i].name,
920                                          acpi_battery_file[i].mode,
921                                          acpi_device_dir(device),
922                                          &acpi_battery_file[i].ops,
923                                          acpi_driver_data(device));
924                 if (!entry)
925                         return -ENODEV;
926         }
927         return 0;
928 }
929
930 static void acpi_battery_remove_fs(struct acpi_device *device)
931 {
932         int i;
933         if (!acpi_device_dir(device))
934                 return;
935         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
936                 remove_proc_entry(acpi_battery_file[i].name,
937                                   acpi_device_dir(device));
938
939         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
940         acpi_device_dir(device) = NULL;
941 }
942
943 #endif
944
945 /* --------------------------------------------------------------------------
946                                  Driver Interface
947    -------------------------------------------------------------------------- */
948
949 static void acpi_battery_notify(struct acpi_device *device, u32 event)
950 {
951         struct acpi_battery *battery = acpi_driver_data(device);
952         struct device *old;
953
954         if (!battery)
955                 return;
956         old = battery->bat.dev;
957         if (event == ACPI_BATTERY_NOTIFY_INFO)
958                 acpi_battery_refresh(battery);
959         acpi_battery_update(battery);
960         acpi_bus_generate_proc_event(device, event,
961                                      acpi_battery_present(battery));
962         acpi_bus_generate_netlink_event(device->pnp.device_class,
963                                         dev_name(&device->dev), event,
964                                         acpi_battery_present(battery));
965         /* acpi_battery_update could remove power_supply object */
966         if (old && battery->bat.dev)
967                 power_supply_changed(&battery->bat);
968 }
969
970 static int battery_notify(struct notifier_block *nb,
971                                unsigned long mode, void *_unused)
972 {
973         struct acpi_battery *battery = container_of(nb, struct acpi_battery,
974                                                     pm_nb);
975         switch (mode) {
976         case PM_POST_HIBERNATION:
977         case PM_POST_SUSPEND:
978                 if (battery->bat.dev) {
979                         sysfs_remove_battery(battery);
980                         sysfs_add_battery(battery);
981                 }
982                 break;
983         }
984
985         return 0;
986 }
987
988 static int acpi_battery_add(struct acpi_device *device)
989 {
990         int result = 0;
991         struct acpi_battery *battery = NULL;
992         acpi_handle handle;
993         if (!device)
994                 return -EINVAL;
995         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
996         if (!battery)
997                 return -ENOMEM;
998         battery->device = device;
999         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
1000         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
1001         device->driver_data = battery;
1002         mutex_init(&battery->lock);
1003         mutex_init(&battery->sysfs_lock);
1004         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
1005                         "_BIX", &handle)))
1006                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
1007         result = acpi_battery_update(battery);
1008         if (result)
1009                 goto fail;
1010 #ifdef CONFIG_ACPI_PROCFS_POWER
1011         result = acpi_battery_add_fs(device);
1012 #endif
1013         if (result) {
1014 #ifdef CONFIG_ACPI_PROCFS_POWER
1015                 acpi_battery_remove_fs(device);
1016 #endif
1017                 goto fail;
1018         }
1019
1020         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1021                 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1022                 device->status.battery_present ? "present" : "absent");
1023
1024         battery->pm_nb.notifier_call = battery_notify;
1025         register_pm_notifier(&battery->pm_nb);
1026
1027         return result;
1028
1029 fail:
1030         sysfs_remove_battery(battery);
1031         mutex_destroy(&battery->lock);
1032         mutex_destroy(&battery->sysfs_lock);
1033         kfree(battery);
1034         return result;
1035 }
1036
1037 static int acpi_battery_remove(struct acpi_device *device, int type)
1038 {
1039         struct acpi_battery *battery = NULL;
1040
1041         if (!device || !acpi_driver_data(device))
1042                 return -EINVAL;
1043         battery = acpi_driver_data(device);
1044         unregister_pm_notifier(&battery->pm_nb);
1045 #ifdef CONFIG_ACPI_PROCFS_POWER
1046         acpi_battery_remove_fs(device);
1047 #endif
1048         sysfs_remove_battery(battery);
1049         mutex_destroy(&battery->lock);
1050         mutex_destroy(&battery->sysfs_lock);
1051         kfree(battery);
1052         return 0;
1053 }
1054
1055 /* this is needed to learn about changes made in suspended state */
1056 static int acpi_battery_resume(struct device *dev)
1057 {
1058         struct acpi_battery *battery;
1059
1060         if (!dev)
1061                 return -EINVAL;
1062
1063         battery = acpi_driver_data(to_acpi_device(dev));
1064         if (!battery)
1065                 return -EINVAL;
1066
1067         battery->update_time = 0;
1068         acpi_battery_update(battery);
1069         return 0;
1070 }
1071
1072 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume);
1073
1074 static struct acpi_driver acpi_battery_driver = {
1075         .name = "battery",
1076         .class = ACPI_BATTERY_CLASS,
1077         .ids = battery_device_ids,
1078         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1079         .ops = {
1080                 .add = acpi_battery_add,
1081                 .remove = acpi_battery_remove,
1082                 .notify = acpi_battery_notify,
1083                 },
1084         .drv.pm = &acpi_battery_pm,
1085 };
1086
1087 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1088 {
1089         if (acpi_disabled)
1090                 return;
1091 #ifdef CONFIG_ACPI_PROCFS_POWER
1092         acpi_battery_dir = acpi_lock_battery_dir();
1093         if (!acpi_battery_dir)
1094                 return;
1095 #endif
1096         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1097 #ifdef CONFIG_ACPI_PROCFS_POWER
1098                 acpi_unlock_battery_dir(acpi_battery_dir);
1099 #endif
1100                 return;
1101         }
1102         return;
1103 }
1104
1105 static int __init acpi_battery_init(void)
1106 {
1107         async_schedule(acpi_battery_init_async, NULL);
1108         return 0;
1109 }
1110
1111 static void __exit acpi_battery_exit(void)
1112 {
1113         acpi_bus_unregister_driver(&acpi_battery_driver);
1114 #ifdef CONFIG_ACPI_PROCFS_POWER
1115         acpi_unlock_battery_dir(acpi_battery_dir);
1116 #endif
1117 }
1118
1119 module_init(acpi_battery_init);
1120 module_exit(acpi_battery_exit);