drm: DRM: fix memset size error
[linux-2.6.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
34 #ifdef CONFIG_ACPI_PROCFS
35 #include <linux/proc_fs.h>
36 #include <linux/seq_file.h>
37 #include <asm/uaccess.h>
38 #endif
39
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42
43 #include <linux/power_supply.h>
44
45 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
46
47 #define ACPI_BATTERY_COMPONENT          0x00040000
48 #define ACPI_BATTERY_CLASS              "battery"
49 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
50 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
51 #define ACPI_BATTERY_NOTIFY_INFO        0x81
52
53 #define _COMPONENT              ACPI_BATTERY_COMPONENT
54
55 ACPI_MODULE_NAME("battery");
56
57 MODULE_AUTHOR("Paul Diefenbaugh");
58 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
59 MODULE_DESCRIPTION("ACPI Battery Driver");
60 MODULE_LICENSE("GPL");
61
62 static unsigned int cache_time = 1000;
63 module_param(cache_time, uint, 0644);
64 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
65
66 #ifdef CONFIG_ACPI_PROCFS
67 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
68 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
69
70 enum acpi_battery_files {
71         info_tag = 0,
72         state_tag,
73         alarm_tag,
74         ACPI_BATTERY_NUMFILES,
75 };
76
77 #endif
78
79 static const struct acpi_device_id battery_device_ids[] = {
80         {"PNP0C0A", 0},
81         {"", 0},
82 };
83
84 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
85
86
87 struct acpi_battery {
88         struct mutex lock;
89         struct power_supply bat;
90         struct acpi_device *device;
91         unsigned long update_time;
92         int current_now;
93         int capacity_now;
94         int voltage_now;
95         int design_capacity;
96         int full_charge_capacity;
97         int technology;
98         int design_voltage;
99         int design_capacity_warning;
100         int design_capacity_low;
101         int capacity_granularity_1;
102         int capacity_granularity_2;
103         int alarm;
104         char model_number[32];
105         char serial_number[32];
106         char type[32];
107         char oem_info[32];
108         int state;
109         int power_unit;
110         u8 alarm_present;
111 };
112
113 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
114
115 inline int acpi_battery_present(struct acpi_battery *battery)
116 {
117         return battery->device->status.battery_present;
118 }
119
120 static int acpi_battery_technology(struct acpi_battery *battery)
121 {
122         if (!strcasecmp("NiCd", battery->type))
123                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
124         if (!strcasecmp("NiMH", battery->type))
125                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
126         if (!strcasecmp("LION", battery->type))
127                 return POWER_SUPPLY_TECHNOLOGY_LION;
128         if (!strcasecmp("LI-ION", battery->type))
129                 return POWER_SUPPLY_TECHNOLOGY_LION;
130         if (!strcasecmp("LiP", battery->type))
131                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
132         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
133 }
134
135 static int acpi_battery_update(struct acpi_battery *battery);
136
137 static int acpi_battery_get_property(struct power_supply *psy,
138                                      enum power_supply_property psp,
139                                      union power_supply_propval *val)
140 {
141         struct acpi_battery *battery = to_acpi_battery(psy);
142
143         if ((!acpi_battery_present(battery)) &&
144              psp != POWER_SUPPLY_PROP_PRESENT)
145                 return -ENODEV;
146         acpi_battery_update(battery);
147         switch (psp) {
148         case POWER_SUPPLY_PROP_STATUS:
149                 if (battery->state & 0x01)
150                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
151                 else if (battery->state & 0x02)
152                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
153                 else if (battery->state == 0)
154                         val->intval = POWER_SUPPLY_STATUS_FULL;
155                 break;
156         case POWER_SUPPLY_PROP_PRESENT:
157                 val->intval = acpi_battery_present(battery);
158                 break;
159         case POWER_SUPPLY_PROP_TECHNOLOGY:
160                 val->intval = acpi_battery_technology(battery);
161                 break;
162         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
163                 val->intval = battery->design_voltage * 1000;
164                 break;
165         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
166                 val->intval = battery->voltage_now * 1000;
167                 break;
168         case POWER_SUPPLY_PROP_CURRENT_NOW:
169                 val->intval = battery->current_now * 1000;
170                 break;
171         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
172         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
173                 val->intval = battery->design_capacity * 1000;
174                 break;
175         case POWER_SUPPLY_PROP_CHARGE_FULL:
176         case POWER_SUPPLY_PROP_ENERGY_FULL:
177                 val->intval = battery->full_charge_capacity * 1000;
178                 break;
179         case POWER_SUPPLY_PROP_CHARGE_NOW:
180         case POWER_SUPPLY_PROP_ENERGY_NOW:
181                 val->intval = battery->capacity_now * 1000;
182                 break;
183         case POWER_SUPPLY_PROP_MODEL_NAME:
184                 val->strval = battery->model_number;
185                 break;
186         case POWER_SUPPLY_PROP_MANUFACTURER:
187                 val->strval = battery->oem_info;
188                 break;
189         default:
190                 return -EINVAL;
191         }
192         return 0;
193 }
194
195 static enum power_supply_property charge_battery_props[] = {
196         POWER_SUPPLY_PROP_STATUS,
197         POWER_SUPPLY_PROP_PRESENT,
198         POWER_SUPPLY_PROP_TECHNOLOGY,
199         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
200         POWER_SUPPLY_PROP_VOLTAGE_NOW,
201         POWER_SUPPLY_PROP_CURRENT_NOW,
202         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
203         POWER_SUPPLY_PROP_CHARGE_FULL,
204         POWER_SUPPLY_PROP_CHARGE_NOW,
205         POWER_SUPPLY_PROP_MODEL_NAME,
206         POWER_SUPPLY_PROP_MANUFACTURER,
207 };
208
209 static enum power_supply_property energy_battery_props[] = {
210         POWER_SUPPLY_PROP_STATUS,
211         POWER_SUPPLY_PROP_PRESENT,
212         POWER_SUPPLY_PROP_TECHNOLOGY,
213         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
214         POWER_SUPPLY_PROP_VOLTAGE_NOW,
215         POWER_SUPPLY_PROP_CURRENT_NOW,
216         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
217         POWER_SUPPLY_PROP_ENERGY_FULL,
218         POWER_SUPPLY_PROP_ENERGY_NOW,
219         POWER_SUPPLY_PROP_MODEL_NAME,
220         POWER_SUPPLY_PROP_MANUFACTURER,
221 };
222
223 #ifdef CONFIG_ACPI_PROCFS
224 inline char *acpi_battery_units(struct acpi_battery *battery)
225 {
226         return (battery->power_unit)?"mA":"mW";
227 }
228 #endif
229
230 /* --------------------------------------------------------------------------
231                                Battery Management
232    -------------------------------------------------------------------------- */
233 struct acpi_offsets {
234         size_t offset;          /* offset inside struct acpi_sbs_battery */
235         u8 mode;                /* int or string? */
236 };
237
238 static struct acpi_offsets state_offsets[] = {
239         {offsetof(struct acpi_battery, state), 0},
240         {offsetof(struct acpi_battery, current_now), 0},
241         {offsetof(struct acpi_battery, capacity_now), 0},
242         {offsetof(struct acpi_battery, voltage_now), 0},
243 };
244
245 static struct acpi_offsets info_offsets[] = {
246         {offsetof(struct acpi_battery, power_unit), 0},
247         {offsetof(struct acpi_battery, design_capacity), 0},
248         {offsetof(struct acpi_battery, full_charge_capacity), 0},
249         {offsetof(struct acpi_battery, technology), 0},
250         {offsetof(struct acpi_battery, design_voltage), 0},
251         {offsetof(struct acpi_battery, design_capacity_warning), 0},
252         {offsetof(struct acpi_battery, design_capacity_low), 0},
253         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
254         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
255         {offsetof(struct acpi_battery, model_number), 1},
256         {offsetof(struct acpi_battery, serial_number), 1},
257         {offsetof(struct acpi_battery, type), 1},
258         {offsetof(struct acpi_battery, oem_info), 1},
259 };
260
261 static int extract_package(struct acpi_battery *battery,
262                            union acpi_object *package,
263                            struct acpi_offsets *offsets, int num)
264 {
265         int i;
266         union acpi_object *element;
267         if (package->type != ACPI_TYPE_PACKAGE)
268                 return -EFAULT;
269         for (i = 0; i < num; ++i) {
270                 if (package->package.count <= i)
271                         return -EFAULT;
272                 element = &package->package.elements[i];
273                 if (offsets[i].mode) {
274                         u8 *ptr = (u8 *)battery + offsets[i].offset;
275                         if (element->type == ACPI_TYPE_STRING ||
276                             element->type == ACPI_TYPE_BUFFER)
277                                 strncpy(ptr, element->string.pointer, 32);
278                         else if (element->type == ACPI_TYPE_INTEGER) {
279                                 strncpy(ptr, (u8 *)&element->integer.value,
280                                         sizeof(acpi_integer));
281                                 ptr[sizeof(acpi_integer)] = 0;
282                         } else return -EFAULT;
283                 } else {
284                         if (element->type == ACPI_TYPE_INTEGER) {
285                                 int *x = (int *)((u8 *)battery +
286                                                 offsets[i].offset);
287                                 *x = element->integer.value;
288                         } else return -EFAULT;
289                 }
290         }
291         return 0;
292 }
293
294 static int acpi_battery_get_status(struct acpi_battery *battery)
295 {
296         if (acpi_bus_get_status(battery->device)) {
297                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
298                 return -ENODEV;
299         }
300         return 0;
301 }
302
303 static int acpi_battery_get_info(struct acpi_battery *battery)
304 {
305         int result = -EFAULT;
306         acpi_status status = 0;
307         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
308
309         if (!acpi_battery_present(battery))
310                 return 0;
311         mutex_lock(&battery->lock);
312         status = acpi_evaluate_object(battery->device->handle, "_BIF",
313                                       NULL, &buffer);
314         mutex_unlock(&battery->lock);
315
316         if (ACPI_FAILURE(status)) {
317                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
318                 return -ENODEV;
319         }
320
321         result = extract_package(battery, buffer.pointer,
322                                  info_offsets, ARRAY_SIZE(info_offsets));
323         kfree(buffer.pointer);
324         return result;
325 }
326
327 static int acpi_battery_get_state(struct acpi_battery *battery)
328 {
329         int result = 0;
330         acpi_status status = 0;
331         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
332
333         if (!acpi_battery_present(battery))
334                 return 0;
335
336         if (battery->update_time &&
337             time_before(jiffies, battery->update_time +
338                         msecs_to_jiffies(cache_time)))
339                 return 0;
340
341         mutex_lock(&battery->lock);
342         status = acpi_evaluate_object(battery->device->handle, "_BST",
343                                       NULL, &buffer);
344         mutex_unlock(&battery->lock);
345
346         if (ACPI_FAILURE(status)) {
347                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
348                 return -ENODEV;
349         }
350
351         result = extract_package(battery, buffer.pointer,
352                                  state_offsets, ARRAY_SIZE(state_offsets));
353         battery->update_time = jiffies;
354         kfree(buffer.pointer);
355         return result;
356 }
357
358 static int acpi_battery_set_alarm(struct acpi_battery *battery)
359 {
360         acpi_status status = 0;
361         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
362         struct acpi_object_list arg_list = { 1, &arg0 };
363
364         if (!acpi_battery_present(battery)|| !battery->alarm_present)
365                 return -ENODEV;
366
367         arg0.integer.value = battery->alarm;
368
369         mutex_lock(&battery->lock);
370         status = acpi_evaluate_object(battery->device->handle, "_BTP",
371                                  &arg_list, NULL);
372         mutex_unlock(&battery->lock);
373
374         if (ACPI_FAILURE(status))
375                 return -ENODEV;
376
377         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
378         return 0;
379 }
380
381 static int acpi_battery_init_alarm(struct acpi_battery *battery)
382 {
383         acpi_status status = AE_OK;
384         acpi_handle handle = NULL;
385
386         /* See if alarms are supported, and if so, set default */
387         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
388         if (ACPI_FAILURE(status)) {
389                 battery->alarm_present = 0;
390                 return 0;
391         }
392         battery->alarm_present = 1;
393         if (!battery->alarm)
394                 battery->alarm = battery->design_capacity_warning;
395         return acpi_battery_set_alarm(battery);
396 }
397
398 static ssize_t acpi_battery_alarm_show(struct device *dev,
399                                         struct device_attribute *attr,
400                                         char *buf)
401 {
402         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
403         return sprintf(buf, "%d\n", battery->alarm * 1000);
404 }
405
406 static ssize_t acpi_battery_alarm_store(struct device *dev,
407                                         struct device_attribute *attr,
408                                         const char *buf, size_t count)
409 {
410         unsigned long x;
411         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
412         if (sscanf(buf, "%ld\n", &x) == 1)
413                 battery->alarm = x/1000;
414         if (acpi_battery_present(battery))
415                 acpi_battery_set_alarm(battery);
416         return count;
417 }
418
419 static struct device_attribute alarm_attr = {
420         .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
421         .show = acpi_battery_alarm_show,
422         .store = acpi_battery_alarm_store,
423 };
424
425 static int sysfs_add_battery(struct acpi_battery *battery)
426 {
427         int result;
428
429         battery->update_time = 0;
430         result = acpi_battery_get_info(battery);
431         acpi_battery_init_alarm(battery);
432         if (result)
433                 return result;
434         if (battery->power_unit) {
435                 battery->bat.properties = charge_battery_props;
436                 battery->bat.num_properties =
437                         ARRAY_SIZE(charge_battery_props);
438         } else {
439                 battery->bat.properties = energy_battery_props;
440                 battery->bat.num_properties =
441                         ARRAY_SIZE(energy_battery_props);
442         }
443
444         battery->bat.name = acpi_device_bid(battery->device);
445         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
446         battery->bat.get_property = acpi_battery_get_property;
447
448         result = power_supply_register(&battery->device->dev, &battery->bat);
449         if (result)
450                 return result;
451         return device_create_file(battery->bat.dev, &alarm_attr);
452 }
453
454 static void sysfs_remove_battery(struct acpi_battery *battery)
455 {
456         if (!battery->bat.dev)
457                 return;
458         device_remove_file(battery->bat.dev, &alarm_attr);
459         power_supply_unregister(&battery->bat);
460 }
461
462 static int acpi_battery_update(struct acpi_battery *battery)
463 {
464         int result = acpi_battery_get_status(battery);
465         if (result)
466                 return result;
467         if (!acpi_battery_present(battery)) {
468                 sysfs_remove_battery(battery);
469                 return 0;
470         }
471         if (!battery->bat.dev)
472                 sysfs_add_battery(battery);
473         return acpi_battery_get_state(battery);
474 }
475
476 /* --------------------------------------------------------------------------
477                               FS Interface (/proc)
478    -------------------------------------------------------------------------- */
479
480 #ifdef CONFIG_ACPI_PROCFS
481 static struct proc_dir_entry *acpi_battery_dir;
482
483 static int acpi_battery_print_info(struct seq_file *seq, int result)
484 {
485         struct acpi_battery *battery = seq->private;
486
487         if (result)
488                 goto end;
489
490         seq_printf(seq, "present:                 %s\n",
491                    acpi_battery_present(battery)?"yes":"no");
492         if (!acpi_battery_present(battery))
493                 goto end;
494         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
495                 seq_printf(seq, "design capacity:         unknown\n");
496         else
497                 seq_printf(seq, "design capacity:         %d %sh\n",
498                            battery->design_capacity,
499                            acpi_battery_units(battery));
500
501         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
502                 seq_printf(seq, "last full capacity:      unknown\n");
503         else
504                 seq_printf(seq, "last full capacity:      %d %sh\n",
505                            battery->full_charge_capacity,
506                            acpi_battery_units(battery));
507
508         seq_printf(seq, "battery technology:      %srechargeable\n",
509                    (!battery->technology)?"non-":"");
510
511         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
512                 seq_printf(seq, "design voltage:          unknown\n");
513         else
514                 seq_printf(seq, "design voltage:          %d mV\n",
515                            battery->design_voltage);
516         seq_printf(seq, "design capacity warning: %d %sh\n",
517                    battery->design_capacity_warning,
518                    acpi_battery_units(battery));
519         seq_printf(seq, "design capacity low:     %d %sh\n",
520                    battery->design_capacity_low,
521                    acpi_battery_units(battery));
522         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
523                    battery->capacity_granularity_1,
524                    acpi_battery_units(battery));
525         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
526                    battery->capacity_granularity_2,
527                    acpi_battery_units(battery));
528         seq_printf(seq, "model number:            %s\n", battery->model_number);
529         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
530         seq_printf(seq, "battery type:            %s\n", battery->type);
531         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
532       end:
533         if (result)
534                 seq_printf(seq, "ERROR: Unable to read battery info\n");
535         return result;
536 }
537
538 static int acpi_battery_print_state(struct seq_file *seq, int result)
539 {
540         struct acpi_battery *battery = seq->private;
541
542         if (result)
543                 goto end;
544
545         seq_printf(seq, "present:                 %s\n",
546                    acpi_battery_present(battery)?"yes":"no");
547         if (!acpi_battery_present(battery))
548                 goto end;
549
550         seq_printf(seq, "capacity state:          %s\n",
551                         (battery->state & 0x04)?"critical":"ok");
552         if ((battery->state & 0x01) && (battery->state & 0x02))
553                 seq_printf(seq,
554                            "charging state:          charging/discharging\n");
555         else if (battery->state & 0x01)
556                 seq_printf(seq, "charging state:          discharging\n");
557         else if (battery->state & 0x02)
558                 seq_printf(seq, "charging state:          charging\n");
559         else
560                 seq_printf(seq, "charging state:          charged\n");
561
562         if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
563                 seq_printf(seq, "present rate:            unknown\n");
564         else
565                 seq_printf(seq, "present rate:            %d %s\n",
566                            battery->current_now, acpi_battery_units(battery));
567
568         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
569                 seq_printf(seq, "remaining capacity:      unknown\n");
570         else
571                 seq_printf(seq, "remaining capacity:      %d %sh\n",
572                            battery->capacity_now, acpi_battery_units(battery));
573         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
574                 seq_printf(seq, "present voltage:         unknown\n");
575         else
576                 seq_printf(seq, "present voltage:         %d mV\n",
577                            battery->voltage_now);
578       end:
579         if (result)
580                 seq_printf(seq, "ERROR: Unable to read battery state\n");
581
582         return result;
583 }
584
585 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
586 {
587         struct acpi_battery *battery = seq->private;
588
589         if (result)
590                 goto end;
591
592         if (!acpi_battery_present(battery)) {
593                 seq_printf(seq, "present:                 no\n");
594                 goto end;
595         }
596         seq_printf(seq, "alarm:                   ");
597         if (!battery->alarm)
598                 seq_printf(seq, "unsupported\n");
599         else
600                 seq_printf(seq, "%u %sh\n", battery->alarm,
601                                 acpi_battery_units(battery));
602       end:
603         if (result)
604                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
605         return result;
606 }
607
608 static ssize_t acpi_battery_write_alarm(struct file *file,
609                                         const char __user * buffer,
610                                         size_t count, loff_t * ppos)
611 {
612         int result = 0;
613         char alarm_string[12] = { '\0' };
614         struct seq_file *m = file->private_data;
615         struct acpi_battery *battery = m->private;
616
617         if (!battery || (count > sizeof(alarm_string) - 1))
618                 return -EINVAL;
619         if (!acpi_battery_present(battery)) {
620                 result = -ENODEV;
621                 goto end;
622         }
623         if (copy_from_user(alarm_string, buffer, count)) {
624                 result = -EFAULT;
625                 goto end;
626         }
627         alarm_string[count] = '\0';
628         battery->alarm = simple_strtol(alarm_string, NULL, 0);
629         result = acpi_battery_set_alarm(battery);
630       end:
631         if (!result)
632                 return count;
633         return result;
634 }
635
636 typedef int(*print_func)(struct seq_file *seq, int result);
637
638 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
639         acpi_battery_print_info,
640         acpi_battery_print_state,
641         acpi_battery_print_alarm,
642 };
643
644 static int acpi_battery_read(int fid, struct seq_file *seq)
645 {
646         struct acpi_battery *battery = seq->private;
647         int result = acpi_battery_update(battery);
648         return acpi_print_funcs[fid](seq, result);
649 }
650
651 #define DECLARE_FILE_FUNCTIONS(_name) \
652 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
653 { \
654         return acpi_battery_read(_name##_tag, seq); \
655 } \
656 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
657 { \
658         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
659 }
660
661 DECLARE_FILE_FUNCTIONS(info);
662 DECLARE_FILE_FUNCTIONS(state);
663 DECLARE_FILE_FUNCTIONS(alarm);
664
665 #undef DECLARE_FILE_FUNCTIONS
666
667 #define FILE_DESCRIPTION_RO(_name) \
668         { \
669         .name = __stringify(_name), \
670         .mode = S_IRUGO, \
671         .ops = { \
672                 .open = acpi_battery_##_name##_open_fs, \
673                 .read = seq_read, \
674                 .llseek = seq_lseek, \
675                 .release = single_release, \
676                 .owner = THIS_MODULE, \
677                 }, \
678         }
679
680 #define FILE_DESCRIPTION_RW(_name) \
681         { \
682         .name = __stringify(_name), \
683         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
684         .ops = { \
685                 .open = acpi_battery_##_name##_open_fs, \
686                 .read = seq_read, \
687                 .llseek = seq_lseek, \
688                 .write = acpi_battery_write_##_name, \
689                 .release = single_release, \
690                 .owner = THIS_MODULE, \
691                 }, \
692         }
693
694 static struct battery_file {
695         struct file_operations ops;
696         mode_t mode;
697         char *name;
698 } acpi_battery_file[] = {
699         FILE_DESCRIPTION_RO(info),
700         FILE_DESCRIPTION_RO(state),
701         FILE_DESCRIPTION_RW(alarm),
702 };
703
704 #undef FILE_DESCRIPTION_RO
705 #undef FILE_DESCRIPTION_RW
706
707 static int acpi_battery_add_fs(struct acpi_device *device)
708 {
709         struct proc_dir_entry *entry = NULL;
710         int i;
711
712         if (!acpi_device_dir(device)) {
713                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
714                                                      acpi_battery_dir);
715                 if (!acpi_device_dir(device))
716                         return -ENODEV;
717                 acpi_device_dir(device)->owner = THIS_MODULE;
718         }
719
720         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
721                 entry = create_proc_entry(acpi_battery_file[i].name,
722                                   acpi_battery_file[i].mode, acpi_device_dir(device));
723                 if (!entry)
724                         return -ENODEV;
725                 else {
726                         entry->proc_fops = &acpi_battery_file[i].ops;
727                         entry->data = acpi_driver_data(device);
728                         entry->owner = THIS_MODULE;
729                 }
730         }
731         return 0;
732 }
733
734 static void acpi_battery_remove_fs(struct acpi_device *device)
735 {
736         int i;
737         if (!acpi_device_dir(device))
738                 return;
739         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
740                 remove_proc_entry(acpi_battery_file[i].name,
741                                   acpi_device_dir(device));
742
743         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
744         acpi_device_dir(device) = NULL;
745 }
746
747 #endif
748
749 /* --------------------------------------------------------------------------
750                                  Driver Interface
751    -------------------------------------------------------------------------- */
752
753 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
754 {
755         struct acpi_battery *battery = data;
756         struct acpi_device *device;
757         if (!battery)
758                 return;
759         device = battery->device;
760         acpi_battery_update(battery);
761         acpi_bus_generate_proc_event(device, event,
762                                      acpi_battery_present(battery));
763         acpi_bus_generate_netlink_event(device->pnp.device_class,
764                                         device->dev.bus_id, event,
765                                         acpi_battery_present(battery));
766         /* acpi_batter_update could remove power_supply object */
767         if (battery->bat.dev)
768                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
769 }
770
771 static int acpi_battery_add(struct acpi_device *device)
772 {
773         int result = 0;
774         acpi_status status = 0;
775         struct acpi_battery *battery = NULL;
776         if (!device)
777                 return -EINVAL;
778         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
779         if (!battery)
780                 return -ENOMEM;
781         battery->device = device;
782         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
783         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
784         acpi_driver_data(device) = battery;
785         mutex_init(&battery->lock);
786         acpi_battery_update(battery);
787 #ifdef CONFIG_ACPI_PROCFS
788         result = acpi_battery_add_fs(device);
789         if (result)
790                 goto end;
791 #endif
792         status = acpi_install_notify_handler(device->handle,
793                                              ACPI_ALL_NOTIFY,
794                                              acpi_battery_notify, battery);
795         if (ACPI_FAILURE(status)) {
796                 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
797                 result = -ENODEV;
798                 goto end;
799         }
800         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
801                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
802                device->status.battery_present ? "present" : "absent");
803       end:
804         if (result) {
805 #ifdef CONFIG_ACPI_PROCFS
806                 acpi_battery_remove_fs(device);
807 #endif
808                 kfree(battery);
809         }
810         return result;
811 }
812
813 static int acpi_battery_remove(struct acpi_device *device, int type)
814 {
815         acpi_status status = 0;
816         struct acpi_battery *battery = NULL;
817
818         if (!device || !acpi_driver_data(device))
819                 return -EINVAL;
820         battery = acpi_driver_data(device);
821         status = acpi_remove_notify_handler(device->handle,
822                                             ACPI_ALL_NOTIFY,
823                                             acpi_battery_notify);
824 #ifdef CONFIG_ACPI_PROCFS
825         acpi_battery_remove_fs(device);
826 #endif
827         sysfs_remove_battery(battery);
828         mutex_destroy(&battery->lock);
829         kfree(battery);
830         return 0;
831 }
832
833 /* this is needed to learn about changes made in suspended state */
834 static int acpi_battery_resume(struct acpi_device *device)
835 {
836         struct acpi_battery *battery;
837         if (!device)
838                 return -EINVAL;
839         battery = acpi_driver_data(device);
840         battery->update_time = 0;
841         acpi_battery_update(battery);
842         return 0;
843 }
844
845 static struct acpi_driver acpi_battery_driver = {
846         .name = "battery",
847         .class = ACPI_BATTERY_CLASS,
848         .ids = battery_device_ids,
849         .ops = {
850                 .add = acpi_battery_add,
851                 .resume = acpi_battery_resume,
852                 .remove = acpi_battery_remove,
853                 },
854 };
855
856 static int __init acpi_battery_init(void)
857 {
858         if (acpi_disabled)
859                 return -ENODEV;
860 #ifdef CONFIG_ACPI_PROCFS
861         acpi_battery_dir = acpi_lock_battery_dir();
862         if (!acpi_battery_dir)
863                 return -ENODEV;
864 #endif
865         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
866 #ifdef CONFIG_ACPI_PROCFS
867                 acpi_unlock_battery_dir(acpi_battery_dir);
868 #endif
869                 return -ENODEV;
870         }
871         return 0;
872 }
873
874 static void __exit acpi_battery_exit(void)
875 {
876         acpi_bus_unregister_driver(&acpi_battery_driver);
877 #ifdef CONFIG_ACPI_PROCFS
878         acpi_unlock_battery_dir(acpi_battery_dir);
879 #endif
880 }
881
882 module_init(acpi_battery_init);
883 module_exit(acpi_battery_exit);