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