treewide: fix potentially dangerous trailing ';' in #defined values/expressions
[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 #define _COMPONENT              ACPI_BATTERY_COMPONENT
59
60 ACPI_MODULE_NAME("battery");
61
62 MODULE_AUTHOR("Paul Diefenbaugh");
63 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
64 MODULE_DESCRIPTION("ACPI Battery Driver");
65 MODULE_LICENSE("GPL");
66
67 static unsigned int cache_time = 1000;
68 module_param(cache_time, uint, 0644);
69 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
70
71 #ifdef CONFIG_ACPI_PROCFS_POWER
72 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
73 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
74
75 enum acpi_battery_files {
76         info_tag = 0,
77         state_tag,
78         alarm_tag,
79         ACPI_BATTERY_NUMFILES,
80 };
81
82 #endif
83
84 static const struct acpi_device_id battery_device_ids[] = {
85         {"PNP0C0A", 0},
86         {"", 0},
87 };
88
89 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
90
91 enum {
92         ACPI_BATTERY_ALARM_PRESENT,
93         ACPI_BATTERY_XINFO_PRESENT,
94         /* For buggy DSDTs that report negative 16-bit values for either
95          * charging or discharging current and/or report 0 as 65536
96          * due to bad math.
97          */
98         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
99         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
100 };
101
102 struct acpi_battery {
103         struct mutex lock;
104         struct power_supply bat;
105         struct acpi_device *device;
106         struct notifier_block pm_nb;
107         unsigned long update_time;
108         int rate_now;
109         int capacity_now;
110         int voltage_now;
111         int design_capacity;
112         int full_charge_capacity;
113         int technology;
114         int design_voltage;
115         int design_capacity_warning;
116         int design_capacity_low;
117         int cycle_count;
118         int measurement_accuracy;
119         int max_sampling_time;
120         int min_sampling_time;
121         int max_averaging_interval;
122         int min_averaging_interval;
123         int capacity_granularity_1;
124         int capacity_granularity_2;
125         int alarm;
126         char model_number[32];
127         char serial_number[32];
128         char type[32];
129         char oem_info[32];
130         int state;
131         int power_unit;
132         unsigned long flags;
133 };
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_present(battery)) {
190                 /* run battery update only if it is present */
191                 acpi_battery_get_state(battery);
192         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
193                 return -ENODEV;
194         switch (psp) {
195         case POWER_SUPPLY_PROP_STATUS:
196                 if (battery->state & 0x01)
197                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
198                 else if (battery->state & 0x02)
199                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
200                 else if (acpi_battery_is_charged(battery))
201                         val->intval = POWER_SUPPLY_STATUS_FULL;
202                 else
203                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
204                 break;
205         case POWER_SUPPLY_PROP_PRESENT:
206                 val->intval = acpi_battery_present(battery);
207                 break;
208         case POWER_SUPPLY_PROP_TECHNOLOGY:
209                 val->intval = acpi_battery_technology(battery);
210                 break;
211         case POWER_SUPPLY_PROP_CYCLE_COUNT:
212                 val->intval = battery->cycle_count;
213                 break;
214         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
215                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
216                         ret = -ENODEV;
217                 else
218                         val->intval = battery->design_voltage * 1000;
219                 break;
220         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
221                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
222                         ret = -ENODEV;
223                 else
224                         val->intval = battery->voltage_now * 1000;
225                 break;
226         case POWER_SUPPLY_PROP_CURRENT_NOW:
227         case POWER_SUPPLY_PROP_POWER_NOW:
228                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
229                         ret = -ENODEV;
230                 else
231                         val->intval = battery->rate_now * 1000;
232                 break;
233         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
234         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
235                 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
236                         ret = -ENODEV;
237                 else
238                         val->intval = battery->design_capacity * 1000;
239                 break;
240         case POWER_SUPPLY_PROP_CHARGE_FULL:
241         case POWER_SUPPLY_PROP_ENERGY_FULL:
242                 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
243                         ret = -ENODEV;
244                 else
245                         val->intval = battery->full_charge_capacity * 1000;
246                 break;
247         case POWER_SUPPLY_PROP_CHARGE_NOW:
248         case POWER_SUPPLY_PROP_ENERGY_NOW:
249                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
250                         ret = -ENODEV;
251                 else
252                         val->intval = battery->capacity_now * 1000;
253                 break;
254         case POWER_SUPPLY_PROP_MODEL_NAME:
255                 val->strval = battery->model_number;
256                 break;
257         case POWER_SUPPLY_PROP_MANUFACTURER:
258                 val->strval = battery->oem_info;
259                 break;
260         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
261                 val->strval = battery->serial_number;
262                 break;
263         default:
264                 ret = -EINVAL;
265         }
266         return ret;
267 }
268
269 static enum power_supply_property charge_battery_props[] = {
270         POWER_SUPPLY_PROP_STATUS,
271         POWER_SUPPLY_PROP_PRESENT,
272         POWER_SUPPLY_PROP_TECHNOLOGY,
273         POWER_SUPPLY_PROP_CYCLE_COUNT,
274         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
275         POWER_SUPPLY_PROP_VOLTAGE_NOW,
276         POWER_SUPPLY_PROP_CURRENT_NOW,
277         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
278         POWER_SUPPLY_PROP_CHARGE_FULL,
279         POWER_SUPPLY_PROP_CHARGE_NOW,
280         POWER_SUPPLY_PROP_MODEL_NAME,
281         POWER_SUPPLY_PROP_MANUFACTURER,
282         POWER_SUPPLY_PROP_SERIAL_NUMBER,
283 };
284
285 static enum power_supply_property energy_battery_props[] = {
286         POWER_SUPPLY_PROP_STATUS,
287         POWER_SUPPLY_PROP_PRESENT,
288         POWER_SUPPLY_PROP_TECHNOLOGY,
289         POWER_SUPPLY_PROP_CYCLE_COUNT,
290         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
291         POWER_SUPPLY_PROP_VOLTAGE_NOW,
292         POWER_SUPPLY_PROP_POWER_NOW,
293         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
294         POWER_SUPPLY_PROP_ENERGY_FULL,
295         POWER_SUPPLY_PROP_ENERGY_NOW,
296         POWER_SUPPLY_PROP_MODEL_NAME,
297         POWER_SUPPLY_PROP_MANUFACTURER,
298         POWER_SUPPLY_PROP_SERIAL_NUMBER,
299 };
300
301 #ifdef CONFIG_ACPI_PROCFS_POWER
302 inline char *acpi_battery_units(struct acpi_battery *battery)
303 {
304         return (battery->power_unit)?"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         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
465             battery->rate_now != -1)
466                 battery->rate_now = abs((s16)battery->rate_now);
467
468         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
469             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
470                 battery->capacity_now = (battery->capacity_now *
471                                 battery->full_charge_capacity) / 100;
472         return result;
473 }
474
475 static int acpi_battery_set_alarm(struct acpi_battery *battery)
476 {
477         acpi_status status = 0;
478         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
479         struct acpi_object_list arg_list = { 1, &arg0 };
480
481         if (!acpi_battery_present(battery) ||
482             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
483                 return -ENODEV;
484
485         arg0.integer.value = battery->alarm;
486
487         mutex_lock(&battery->lock);
488         status = acpi_evaluate_object(battery->device->handle, "_BTP",
489                                  &arg_list, NULL);
490         mutex_unlock(&battery->lock);
491
492         if (ACPI_FAILURE(status))
493                 return -ENODEV;
494
495         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
496         return 0;
497 }
498
499 static int acpi_battery_init_alarm(struct acpi_battery *battery)
500 {
501         acpi_status status = AE_OK;
502         acpi_handle handle = NULL;
503
504         /* See if alarms are supported, and if so, set default */
505         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
506         if (ACPI_FAILURE(status)) {
507                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
508                 return 0;
509         }
510         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
511         if (!battery->alarm)
512                 battery->alarm = battery->design_capacity_warning;
513         return acpi_battery_set_alarm(battery);
514 }
515
516 static ssize_t acpi_battery_alarm_show(struct device *dev,
517                                         struct device_attribute *attr,
518                                         char *buf)
519 {
520         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
521         return sprintf(buf, "%d\n", battery->alarm * 1000);
522 }
523
524 static ssize_t acpi_battery_alarm_store(struct device *dev,
525                                         struct device_attribute *attr,
526                                         const char *buf, size_t count)
527 {
528         unsigned long x;
529         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
530         if (sscanf(buf, "%ld\n", &x) == 1)
531                 battery->alarm = x/1000;
532         if (acpi_battery_present(battery))
533                 acpi_battery_set_alarm(battery);
534         return count;
535 }
536
537 static struct device_attribute alarm_attr = {
538         .attr = {.name = "alarm", .mode = 0644},
539         .show = acpi_battery_alarm_show,
540         .store = acpi_battery_alarm_store,
541 };
542
543 static int sysfs_add_battery(struct acpi_battery *battery)
544 {
545         int result;
546
547         if (battery->power_unit) {
548                 battery->bat.properties = charge_battery_props;
549                 battery->bat.num_properties =
550                         ARRAY_SIZE(charge_battery_props);
551         } else {
552                 battery->bat.properties = energy_battery_props;
553                 battery->bat.num_properties =
554                         ARRAY_SIZE(energy_battery_props);
555         }
556
557         battery->bat.name = acpi_device_bid(battery->device);
558         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
559         battery->bat.get_property = acpi_battery_get_property;
560
561         result = power_supply_register(&battery->device->dev, &battery->bat);
562         if (result)
563                 return result;
564         return device_create_file(battery->bat.dev, &alarm_attr);
565 }
566
567 static void sysfs_remove_battery(struct acpi_battery *battery)
568 {
569         if (!battery->bat.dev)
570                 return;
571         device_remove_file(battery->bat.dev, &alarm_attr);
572         power_supply_unregister(&battery->bat);
573         battery->bat.dev = NULL;
574 }
575
576 static void acpi_battery_quirks(struct acpi_battery *battery)
577 {
578         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
579                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
580         }
581 }
582
583 /*
584  * According to the ACPI spec, some kinds of primary batteries can
585  * report percentage battery remaining capacity directly to OS.
586  * In this case, it reports the Last Full Charged Capacity == 100
587  * and BatteryPresentRate == 0xFFFFFFFF.
588  *
589  * Now we found some battery reports percentage remaining capacity
590  * even if it's rechargeable.
591  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
592  *
593  * Handle this correctly so that they won't break userspace.
594  */
595 static void acpi_battery_quirks2(struct acpi_battery *battery)
596 {
597         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
598                 return ;
599
600         if (battery->full_charge_capacity == 100 &&
601             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
602             battery->capacity_now >=0 && battery->capacity_now <= 100) {
603                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
604                 battery->full_charge_capacity = battery->design_capacity;
605                 battery->capacity_now = (battery->capacity_now *
606                                 battery->full_charge_capacity) / 100;
607         }
608 }
609
610 static int acpi_battery_update(struct acpi_battery *battery)
611 {
612         int result, old_present = acpi_battery_present(battery);
613         result = acpi_battery_get_status(battery);
614         if (result)
615                 return result;
616         if (!acpi_battery_present(battery)) {
617                 sysfs_remove_battery(battery);
618                 battery->update_time = 0;
619                 return 0;
620         }
621         if (!battery->update_time ||
622             old_present != acpi_battery_present(battery)) {
623                 result = acpi_battery_get_info(battery);
624                 if (result)
625                         return result;
626                 acpi_battery_quirks(battery);
627                 acpi_battery_init_alarm(battery);
628         }
629         if (!battery->bat.dev)
630                 sysfs_add_battery(battery);
631         result = acpi_battery_get_state(battery);
632         acpi_battery_quirks2(battery);
633         return result;
634 }
635
636 static void acpi_battery_refresh(struct acpi_battery *battery)
637 {
638         if (!battery->bat.dev)
639                 return;
640
641         acpi_battery_get_info(battery);
642         /* The battery may have changed its reporting units. */
643         sysfs_remove_battery(battery);
644         sysfs_add_battery(battery);
645 }
646
647 /* --------------------------------------------------------------------------
648                               FS Interface (/proc)
649    -------------------------------------------------------------------------- */
650
651 #ifdef CONFIG_ACPI_PROCFS_POWER
652 static struct proc_dir_entry *acpi_battery_dir;
653
654 static int acpi_battery_print_info(struct seq_file *seq, int result)
655 {
656         struct acpi_battery *battery = seq->private;
657
658         if (result)
659                 goto end;
660
661         seq_printf(seq, "present:                 %s\n",
662                    acpi_battery_present(battery)?"yes":"no");
663         if (!acpi_battery_present(battery))
664                 goto end;
665         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
666                 seq_printf(seq, "design capacity:         unknown\n");
667         else
668                 seq_printf(seq, "design capacity:         %d %sh\n",
669                            battery->design_capacity,
670                            acpi_battery_units(battery));
671
672         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
673                 seq_printf(seq, "last full capacity:      unknown\n");
674         else
675                 seq_printf(seq, "last full capacity:      %d %sh\n",
676                            battery->full_charge_capacity,
677                            acpi_battery_units(battery));
678
679         seq_printf(seq, "battery technology:      %srechargeable\n",
680                    (!battery->technology)?"non-":"");
681
682         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
683                 seq_printf(seq, "design voltage:          unknown\n");
684         else
685                 seq_printf(seq, "design voltage:          %d mV\n",
686                            battery->design_voltage);
687         seq_printf(seq, "design capacity warning: %d %sh\n",
688                    battery->design_capacity_warning,
689                    acpi_battery_units(battery));
690         seq_printf(seq, "design capacity low:     %d %sh\n",
691                    battery->design_capacity_low,
692                    acpi_battery_units(battery));
693         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
694         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
695                    battery->capacity_granularity_1,
696                    acpi_battery_units(battery));
697         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
698                    battery->capacity_granularity_2,
699                    acpi_battery_units(battery));
700         seq_printf(seq, "model number:            %s\n", battery->model_number);
701         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
702         seq_printf(seq, "battery type:            %s\n", battery->type);
703         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
704       end:
705         if (result)
706                 seq_printf(seq, "ERROR: Unable to read battery info\n");
707         return result;
708 }
709
710 static int acpi_battery_print_state(struct seq_file *seq, int result)
711 {
712         struct acpi_battery *battery = seq->private;
713
714         if (result)
715                 goto end;
716
717         seq_printf(seq, "present:                 %s\n",
718                    acpi_battery_present(battery)?"yes":"no");
719         if (!acpi_battery_present(battery))
720                 goto end;
721
722         seq_printf(seq, "capacity state:          %s\n",
723                         (battery->state & 0x04)?"critical":"ok");
724         if ((battery->state & 0x01) && (battery->state & 0x02))
725                 seq_printf(seq,
726                            "charging state:          charging/discharging\n");
727         else if (battery->state & 0x01)
728                 seq_printf(seq, "charging state:          discharging\n");
729         else if (battery->state & 0x02)
730                 seq_printf(seq, "charging state:          charging\n");
731         else
732                 seq_printf(seq, "charging state:          charged\n");
733
734         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
735                 seq_printf(seq, "present rate:            unknown\n");
736         else
737                 seq_printf(seq, "present rate:            %d %s\n",
738                            battery->rate_now, acpi_battery_units(battery));
739
740         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
741                 seq_printf(seq, "remaining capacity:      unknown\n");
742         else
743                 seq_printf(seq, "remaining capacity:      %d %sh\n",
744                            battery->capacity_now, acpi_battery_units(battery));
745         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
746                 seq_printf(seq, "present voltage:         unknown\n");
747         else
748                 seq_printf(seq, "present voltage:         %d mV\n",
749                            battery->voltage_now);
750       end:
751         if (result)
752                 seq_printf(seq, "ERROR: Unable to read battery state\n");
753
754         return result;
755 }
756
757 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
758 {
759         struct acpi_battery *battery = seq->private;
760
761         if (result)
762                 goto end;
763
764         if (!acpi_battery_present(battery)) {
765                 seq_printf(seq, "present:                 no\n");
766                 goto end;
767         }
768         seq_printf(seq, "alarm:                   ");
769         if (!battery->alarm)
770                 seq_printf(seq, "unsupported\n");
771         else
772                 seq_printf(seq, "%u %sh\n", battery->alarm,
773                                 acpi_battery_units(battery));
774       end:
775         if (result)
776                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
777         return result;
778 }
779
780 static ssize_t acpi_battery_write_alarm(struct file *file,
781                                         const char __user * buffer,
782                                         size_t count, loff_t * ppos)
783 {
784         int result = 0;
785         char alarm_string[12] = { '\0' };
786         struct seq_file *m = file->private_data;
787         struct acpi_battery *battery = m->private;
788
789         if (!battery || (count > sizeof(alarm_string) - 1))
790                 return -EINVAL;
791         if (!acpi_battery_present(battery)) {
792                 result = -ENODEV;
793                 goto end;
794         }
795         if (copy_from_user(alarm_string, buffer, count)) {
796                 result = -EFAULT;
797                 goto end;
798         }
799         alarm_string[count] = '\0';
800         battery->alarm = simple_strtol(alarm_string, NULL, 0);
801         result = acpi_battery_set_alarm(battery);
802       end:
803         if (!result)
804                 return count;
805         return result;
806 }
807
808 typedef int(*print_func)(struct seq_file *seq, int result);
809
810 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
811         acpi_battery_print_info,
812         acpi_battery_print_state,
813         acpi_battery_print_alarm,
814 };
815
816 static int acpi_battery_read(int fid, struct seq_file *seq)
817 {
818         struct acpi_battery *battery = seq->private;
819         int result = acpi_battery_update(battery);
820         return acpi_print_funcs[fid](seq, result);
821 }
822
823 #define DECLARE_FILE_FUNCTIONS(_name) \
824 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
825 { \
826         return acpi_battery_read(_name##_tag, seq); \
827 } \
828 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
829 { \
830         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
831 }
832
833 DECLARE_FILE_FUNCTIONS(info);
834 DECLARE_FILE_FUNCTIONS(state);
835 DECLARE_FILE_FUNCTIONS(alarm);
836
837 #undef DECLARE_FILE_FUNCTIONS
838
839 #define FILE_DESCRIPTION_RO(_name) \
840         { \
841         .name = __stringify(_name), \
842         .mode = S_IRUGO, \
843         .ops = { \
844                 .open = acpi_battery_##_name##_open_fs, \
845                 .read = seq_read, \
846                 .llseek = seq_lseek, \
847                 .release = single_release, \
848                 .owner = THIS_MODULE, \
849                 }, \
850         }
851
852 #define FILE_DESCRIPTION_RW(_name) \
853         { \
854         .name = __stringify(_name), \
855         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
856         .ops = { \
857                 .open = acpi_battery_##_name##_open_fs, \
858                 .read = seq_read, \
859                 .llseek = seq_lseek, \
860                 .write = acpi_battery_write_##_name, \
861                 .release = single_release, \
862                 .owner = THIS_MODULE, \
863                 }, \
864         }
865
866 static struct battery_file {
867         struct file_operations ops;
868         mode_t mode;
869         const char *name;
870 } acpi_battery_file[] = {
871         FILE_DESCRIPTION_RO(info),
872         FILE_DESCRIPTION_RO(state),
873         FILE_DESCRIPTION_RW(alarm),
874 };
875
876 #undef FILE_DESCRIPTION_RO
877 #undef FILE_DESCRIPTION_RW
878
879 static int acpi_battery_add_fs(struct acpi_device *device)
880 {
881         struct proc_dir_entry *entry = NULL;
882         int i;
883
884         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
885                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
886         if (!acpi_device_dir(device)) {
887                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
888                                                      acpi_battery_dir);
889                 if (!acpi_device_dir(device))
890                         return -ENODEV;
891         }
892
893         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
894                 entry = proc_create_data(acpi_battery_file[i].name,
895                                          acpi_battery_file[i].mode,
896                                          acpi_device_dir(device),
897                                          &acpi_battery_file[i].ops,
898                                          acpi_driver_data(device));
899                 if (!entry)
900                         return -ENODEV;
901         }
902         return 0;
903 }
904
905 static void acpi_battery_remove_fs(struct acpi_device *device)
906 {
907         int i;
908         if (!acpi_device_dir(device))
909                 return;
910         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
911                 remove_proc_entry(acpi_battery_file[i].name,
912                                   acpi_device_dir(device));
913
914         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
915         acpi_device_dir(device) = NULL;
916 }
917
918 #endif
919
920 /* --------------------------------------------------------------------------
921                                  Driver Interface
922    -------------------------------------------------------------------------- */
923
924 static void acpi_battery_notify(struct acpi_device *device, u32 event)
925 {
926         struct acpi_battery *battery = acpi_driver_data(device);
927         struct device *old;
928
929         if (!battery)
930                 return;
931         old = battery->bat.dev;
932         if (event == ACPI_BATTERY_NOTIFY_INFO)
933                 acpi_battery_refresh(battery);
934         acpi_battery_update(battery);
935         acpi_bus_generate_proc_event(device, event,
936                                      acpi_battery_present(battery));
937         acpi_bus_generate_netlink_event(device->pnp.device_class,
938                                         dev_name(&device->dev), event,
939                                         acpi_battery_present(battery));
940         /* acpi_battery_update could remove power_supply object */
941         if (old && battery->bat.dev)
942                 power_supply_changed(&battery->bat);
943 }
944
945 static int battery_notify(struct notifier_block *nb,
946                                unsigned long mode, void *_unused)
947 {
948         struct acpi_battery *battery = container_of(nb, struct acpi_battery,
949                                                     pm_nb);
950         switch (mode) {
951         case PM_POST_SUSPEND:
952                 sysfs_remove_battery(battery);
953                 sysfs_add_battery(battery);
954                 break;
955         }
956
957         return 0;
958 }
959
960 static int acpi_battery_add(struct acpi_device *device)
961 {
962         int result = 0;
963         struct acpi_battery *battery = NULL;
964         acpi_handle handle;
965         if (!device)
966                 return -EINVAL;
967         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
968         if (!battery)
969                 return -ENOMEM;
970         battery->device = device;
971         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
972         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
973         device->driver_data = battery;
974         mutex_init(&battery->lock);
975         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
976                         "_BIX", &handle)))
977                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
978         acpi_battery_update(battery);
979 #ifdef CONFIG_ACPI_PROCFS_POWER
980         result = acpi_battery_add_fs(device);
981 #endif
982         if (!result) {
983                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
984                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
985                         device->status.battery_present ? "present" : "absent");
986         } else {
987 #ifdef CONFIG_ACPI_PROCFS_POWER
988                 acpi_battery_remove_fs(device);
989 #endif
990                 kfree(battery);
991         }
992
993         battery->pm_nb.notifier_call = battery_notify;
994         register_pm_notifier(&battery->pm_nb);
995
996         return result;
997 }
998
999 static int acpi_battery_remove(struct acpi_device *device, int type)
1000 {
1001         struct acpi_battery *battery = NULL;
1002
1003         if (!device || !acpi_driver_data(device))
1004                 return -EINVAL;
1005         battery = acpi_driver_data(device);
1006         unregister_pm_notifier(&battery->pm_nb);
1007 #ifdef CONFIG_ACPI_PROCFS_POWER
1008         acpi_battery_remove_fs(device);
1009 #endif
1010         sysfs_remove_battery(battery);
1011         mutex_destroy(&battery->lock);
1012         kfree(battery);
1013         return 0;
1014 }
1015
1016 /* this is needed to learn about changes made in suspended state */
1017 static int acpi_battery_resume(struct acpi_device *device)
1018 {
1019         struct acpi_battery *battery;
1020         if (!device)
1021                 return -EINVAL;
1022         battery = acpi_driver_data(device);
1023         battery->update_time = 0;
1024         acpi_battery_update(battery);
1025         return 0;
1026 }
1027
1028 static struct acpi_driver acpi_battery_driver = {
1029         .name = "battery",
1030         .class = ACPI_BATTERY_CLASS,
1031         .ids = battery_device_ids,
1032         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1033         .ops = {
1034                 .add = acpi_battery_add,
1035                 .resume = acpi_battery_resume,
1036                 .remove = acpi_battery_remove,
1037                 .notify = acpi_battery_notify,
1038                 },
1039 };
1040
1041 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1042 {
1043         if (acpi_disabled)
1044                 return;
1045 #ifdef CONFIG_ACPI_PROCFS_POWER
1046         acpi_battery_dir = acpi_lock_battery_dir();
1047         if (!acpi_battery_dir)
1048                 return;
1049 #endif
1050         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1051 #ifdef CONFIG_ACPI_PROCFS_POWER
1052                 acpi_unlock_battery_dir(acpi_battery_dir);
1053 #endif
1054                 return;
1055         }
1056         return;
1057 }
1058
1059 static int __init acpi_battery_init(void)
1060 {
1061         async_schedule(acpi_battery_init_async, NULL);
1062         return 0;
1063 }
1064
1065 static void __exit acpi_battery_exit(void)
1066 {
1067         acpi_bus_unregister_driver(&acpi_battery_driver);
1068 #ifdef CONFIG_ACPI_PROCFS_POWER
1069         acpi_unlock_battery_dir(acpi_battery_dir);
1070 #endif
1071 }
1072
1073 module_init(acpi_battery_init);
1074 module_exit(acpi_battery_exit);