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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / drivers / acpi / battery.c
blobf6218dd8f065747d4b3bf0441d95dab331ef8cab
1 /*
2 * acpi_battery.c - ACPI Battery Driver ($Revision: 37 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/proc_fs.h>
31 #include <asm/uaccess.h>
32
33 #include <acpi/acpi_bus.h>
34 #include <acpi/acpi_drivers.h>
35
36
37 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
38
39 #define ACPI_BATTERY_FORMAT_BIF "NNNNNNNNNSSSS"
40 #define ACPI_BATTERY_FORMAT_BST "NNNN"
41
42 #define ACPI_BATTERY_COMPONENT 0x00040000
43 #define ACPI_BATTERY_CLASS "battery"
44 #define ACPI_BATTERY_HID "PNP0C0A"
45 #define ACPI_BATTERY_DRIVER_NAME "ACPI Battery Driver"
46 #define ACPI_BATTERY_DEVICE_NAME "Battery"
47 #define ACPI_BATTERY_FILE_INFO "info"
48 #define ACPI_BATTERY_FILE_STATUS "state"
49 #define ACPI_BATTERY_FILE_ALARM "alarm"
50 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
51 #define ACPI_BATTERY_NOTIFY_INFO 0x81
52 #define ACPI_BATTERY_UNITS_WATTS "mW"
53 #define ACPI_BATTERY_UNITS_AMPS "mA"
54
55
56 #define _COMPONENT ACPI_BATTERY_COMPONENT
57 ACPI_MODULE_NAME ("acpi_battery")
58
59 MODULE_AUTHOR("Paul Diefenbaugh");
60 MODULE_DESCRIPTION(ACPI_BATTERY_DRIVER_NAME);
61 MODULE_LICENSE("GPL");
62
63 static int acpi_battery_add (struct acpi_device *device);
64 static int acpi_battery_remove (struct acpi_device *device, int type);
65
66 static struct acpi_driver acpi_battery_driver = {
67 .name = ACPI_BATTERY_DRIVER_NAME,
68 .class = ACPI_BATTERY_CLASS,
69 .ids = ACPI_BATTERY_HID,
70 .ops = {
71 .add = acpi_battery_add,
72 .remove = acpi_battery_remove,
73 },
74 };
75
76 struct acpi_battery_status {
77 acpi_integer state;
78 acpi_integer present_rate;
79 acpi_integer remaining_capacity;
80 acpi_integer present_voltage;
81 };
82
83 struct acpi_battery_info {
84 acpi_integer power_unit;
85 acpi_integer design_capacity;
86 acpi_integer last_full_capacity;
87 acpi_integer battery_technology;
88 acpi_integer design_voltage;
89 acpi_integer design_capacity_warning;
90 acpi_integer design_capacity_low;
91 acpi_integer battery_capacity_granularity_1;
92 acpi_integer battery_capacity_granularity_2;
93 acpi_string model_number;
94 acpi_string serial_number;
95 acpi_string battery_type;
96 acpi_string oem_info;
97 };
98
99 struct acpi_battery_flags {
100 u8 present:1; /* Bay occupied? */
101 u8 power_unit:1; /* 0=watts, 1=apms */
102 u8 alarm:1; /* _BTP present? */
103 u8 reserved:5;
104 };
105
106 struct acpi_battery_trips {
107 unsigned long warning;
108 unsigned long low;
109 };
110
111 struct acpi_battery {
112 acpi_handle handle;
113 struct acpi_battery_flags flags;
114 struct acpi_battery_trips trips;
115 unsigned long alarm;
116 struct acpi_battery_info *info;
117 };
118
119
120 /* --------------------------------------------------------------------------
121 Battery Management
122 -------------------------------------------------------------------------- */
123
124 static int
125 acpi_battery_get_info (
126 struct acpi_battery *battery,
127 struct acpi_battery_info **bif)
128 {
129 int result = 0;
130 acpi_status status = 0;
131 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
132 struct acpi_buffer format = {sizeof(ACPI_BATTERY_FORMAT_BIF),
133 ACPI_BATTERY_FORMAT_BIF};
134 struct acpi_buffer data = {0, NULL};
135 union acpi_object *package = NULL;
136
137 ACPI_FUNCTION_TRACE("acpi_battery_get_info");
138
139 if (!battery || !bif)
140 return_VALUE(-EINVAL);
141
142 /* Evalute _BIF */
143
144 status = acpi_evaluate_object(battery->handle, "_BIF", NULL, &buffer);
145 if (ACPI_FAILURE(status)) {
146 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BIF\n"));
147 return_VALUE(-ENODEV);
148 }
149
150 package = (union acpi_object *) buffer.pointer;
151
152 /* Extract Package Data */
153
154 status = acpi_extract_package(package, &format, &data);
155 if (status != AE_BUFFER_OVERFLOW) {
156 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BIF\n"));
157 result = -ENODEV;
158 goto end;
159 }
160
161 data.pointer = kmalloc(data.length, GFP_KERNEL);
162 if (!data.pointer) {
163 result = -ENOMEM;
164 goto end;
165 }
166 memset(data.pointer, 0, data.length);
167
168 status = acpi_extract_package(package, &format, &data);
169 if (ACPI_FAILURE(status)) {
170 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BIF\n"));
171 kfree(data.pointer);
172 result = -ENODEV;
173 goto end;
174 }
175
176 end:
177 acpi_os_free(buffer.pointer);
178
179 if (!result)
180 (*bif) = (struct acpi_battery_info *) data.pointer;
181
182 return_VALUE(result);
183 }
184
185 static int
186 acpi_battery_get_status (
187 struct acpi_battery *battery,
188 struct acpi_battery_status **bst)
189 {
190 int result = 0;
191 acpi_status status = 0;
192 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
193 struct acpi_buffer format = {sizeof(ACPI_BATTERY_FORMAT_BST),
194 ACPI_BATTERY_FORMAT_BST};
195 struct acpi_buffer data = {0, NULL};
196 union acpi_object *package = NULL;
197
198 ACPI_FUNCTION_TRACE("acpi_battery_get_status");
199
200 if (!battery || !bst)
201 return_VALUE(-EINVAL);
202
203 /* Evalute _BST */
204
205 status = acpi_evaluate_object(battery->handle, "_BST", NULL, &buffer);
206 if (ACPI_FAILURE(status)) {
207 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _BST\n"));
208 return_VALUE(-ENODEV);
209 }
210
211 package = (union acpi_object *) buffer.pointer;
212
213 /* Extract Package Data */
214
215 status = acpi_extract_package(package, &format, &data);
216 if (status != AE_BUFFER_OVERFLOW) {
217 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BST\n"));
218 result = -ENODEV;
219 goto end;
220 }
221
222 data.pointer = kmalloc(data.length, GFP_KERNEL);
223 if (!data.pointer) {
224 result = -ENOMEM;
225 goto end;
226 }
227 memset(data.pointer, 0, data.length);
228
229 status = acpi_extract_package(package, &format, &data);
230 if (ACPI_FAILURE(status)) {
231 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error extracting _BST\n"));
232 kfree(data.pointer);
233 result = -ENODEV;
234 goto end;
235 }
236
237 end:
238 acpi_os_free(buffer.pointer);
239
240 if (!result)
241 (*bst) = (struct acpi_battery_status *) data.pointer;
242
243 return_VALUE(result);
244 }
245
246
247 static int
248 acpi_battery_set_alarm (
249 struct acpi_battery *battery,
250 unsigned long alarm)
251 {
252 acpi_status status = 0;
253 union acpi_object arg0 = {ACPI_TYPE_INTEGER};
254 struct acpi_object_list arg_list = {1, &arg0};
255
256 ACPI_FUNCTION_TRACE("acpi_battery_set_alarm");
257
258 if (!battery)
259 return_VALUE(-EINVAL);
260
261 if (!battery->flags.alarm)
262 return_VALUE(-ENODEV);
263
264 arg0.integer.value = alarm;
265
266 status = acpi_evaluate_object(battery->handle, "_BTP", &arg_list, NULL);
267 if (ACPI_FAILURE(status))
268 return_VALUE(-ENODEV);
269
270 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
271
272 battery->alarm = alarm;
273
274 return_VALUE(0);
275 }
276
277
278 static int
279 acpi_battery_check (
280 struct acpi_battery *battery)
281 {
282 int result = 0;
283 acpi_status status = AE_OK;
284 acpi_handle handle = NULL;
285 struct acpi_device *device = NULL;
286 struct acpi_battery_info *bif = NULL;
287
288 ACPI_FUNCTION_TRACE("acpi_battery_check");
289
290 if (!battery)
291 return_VALUE(-EINVAL);
292
293 result = acpi_bus_get_device(battery->handle, &device);
294 if (result)
295 return_VALUE(result);
296
297 result = acpi_bus_get_status(device);
298 if (result)
299 return_VALUE(result);
300
301 /* Insertion? */
302
303 if (!battery->flags.present && device->status.battery_present) {
304
305 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery inserted\n"));
306
307 /* Evalute _BIF to get certain static information */
308
309 result = acpi_battery_get_info(battery, &bif);
310 if (result)
311 return_VALUE(result);
312
313 battery->flags.power_unit = bif->power_unit;
314 battery->trips.warning = bif->design_capacity_warning;
315 battery->trips.low = bif->design_capacity_low;
316 kfree(bif);
317
318 /* See if alarms are supported, and if so, set default */
319
320 status = acpi_get_handle(battery->handle, "_BTP", &handle);
321 if (ACPI_SUCCESS(status)) {
322 battery->flags.alarm = 1;
323 acpi_battery_set_alarm(battery, battery->trips.warning);
324 }
325 }
326
327 /* Removal? */
328
329 else if (battery->flags.present && !device->status.battery_present) {
330 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Battery removed\n"));
331 }
332
333 battery->flags.present = device->status.battery_present;
334
335 return_VALUE(result);
336 }
337
338
339 /* --------------------------------------------------------------------------
340 FS Interface (/proc)
341 -------------------------------------------------------------------------- */
342
343 struct proc_dir_entry *acpi_battery_dir;
344
345 static int
346 acpi_battery_read_info (
347 char *page,
348 char **start,
349 off_t off,
350 int count,
351 int *eof,
352 void *data)
353 {
354 int result = 0;
355 struct acpi_battery *battery = (struct acpi_battery *) data;
356 struct acpi_battery_info *bif = NULL;
357 char *units = "?";
358 char *p = page;
359 int len = 0;
360
361 ACPI_FUNCTION_TRACE("acpi_battery_read_info");
362
363 if (!battery || (off != 0))
364 goto end;
365
366 if (battery->flags.present)
367 p += sprintf(p, "present: yes\n");
368 else {
369 p += sprintf(p, "present: no\n");
370 goto end;
371 }
372
373 /* Battery Info (_BIF) */
374
375 result = acpi_battery_get_info(battery, &bif);
376 if (result || !bif) {
377 p += sprintf(p, "ERROR: Unable to read battery information\n");
378 goto end;
379 }
380
381 units = bif->power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
382
383 if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
384 p += sprintf(p, "design capacity: unknown\n");
385 else
386 p += sprintf(p, "design capacity: %d %sh\n",
387 (u32) bif->design_capacity, units);
388
389 if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
390 p += sprintf(p, "last full capacity: unknown\n");
391 else
392 p += sprintf(p, "last full capacity: %d %sh\n",
393 (u32) bif->last_full_capacity, units);
394
395 switch ((u32) bif->battery_technology) {
396 case 0:
397 p += sprintf(p, "battery technology: non-rechargeable\n");
398 break;
399 case 1:
400 p += sprintf(p, "battery technology: rechargeable\n");
401 break;
402 default:
403 p += sprintf(p, "battery technology: unknown\n");
404 break;
405 }
406
407 if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
408 p += sprintf(p, "design voltage: unknown\n");
409 else
410 p += sprintf(p, "design voltage: %d mV\n",
411 (u32) bif->design_voltage);
412
413 p += sprintf(p, "design capacity warning: %d %sh\n",
414 (u32) bif->design_capacity_warning, units);
415 p += sprintf(p, "design capacity low: %d %sh\n",
416 (u32) bif->design_capacity_low, units);
417 p += sprintf(p, "capacity granularity 1: %d %sh\n",
418 (u32) bif->battery_capacity_granularity_1, units);
419 p += sprintf(p, "capacity granularity 2: %d %sh\n",
420 (u32) bif->battery_capacity_granularity_2, units);
421 p += sprintf(p, "model number: %s\n",
422 bif->model_number);
423 p += sprintf(p, "serial number: %s\n",
424 bif->serial_number);
425 p += sprintf(p, "battery type: %s\n",
426 bif->battery_type);
427 p += sprintf(p, "OEM info: %s\n",
428 bif->oem_info);
429
430 end:
431 kfree(bif);
432
433 len = (p - page);
434 if (len <= off+count) *eof = 1;
435 *start = page + off;
436 len -= off;
437 if (len>count) len = count;
438 if (len<0) len = 0;
439
440 return_VALUE(len);
441 }
442
443
444 static int
445 acpi_battery_read_state (
446 char *page,
447 char **start,
448 off_t off,
449 int count,
450 int *eof,
451 void *data)
452 {
453 int result = 0;
454 struct acpi_battery *battery = (struct acpi_battery *) data;
455 struct acpi_battery_status *bst = NULL;
456 char *units = "?";
457 char *p = page;
458 int len = 0;
459
460 ACPI_FUNCTION_TRACE("acpi_battery_read_state");
461
462 if (!battery || (off != 0))
463 goto end;
464
465 if (battery->flags.present)
466 p += sprintf(p, "present: yes\n");
467 else {
468 p += sprintf(p, "present: no\n");
469 goto end;
470 }
471
472 /* Battery Units */
473
474 units = battery->flags.power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
475
476 /* Battery Status (_BST) */
477
478 result = acpi_battery_get_status(battery, &bst);
479 if (result || !bst) {
480 p += sprintf(p, "ERROR: Unable to read battery status\n");
481 goto end;
482 }
483
484 if (!(bst->state & 0x04))
485 p += sprintf(p, "capacity state: ok\n");
486 else
487 p += sprintf(p, "capacity state: critical\n");
488
489 if ((bst->state & 0x01) && (bst->state & 0x02)){
490 p += sprintf(p, "charging state: charging/discharging\n");
491 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
492 "Battery Charging and Discharging?\n"));
493 }
494 else if (bst->state & 0x01)
495 p += sprintf(p, "charging state: discharging\n");
496 else if (bst->state & 0x02)
497 p += sprintf(p, "charging state: charging\n");
498 else {
499 p += sprintf(p, "charging state: charged\n");
500 }
501
502 if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
503 p += sprintf(p, "present rate: unknown\n");
504 else
505 p += sprintf(p, "present rate: %d %s\n",
506 (u32) bst->present_rate, units);
507
508 if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
509 p += sprintf(p, "remaining capacity: unknown\n");
510 else
511 p += sprintf(p, "remaining capacity: %d %sh\n",
512 (u32) bst->remaining_capacity, units);
513
514 if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
515 p += sprintf(p, "present voltage: unknown\n");
516 else
517 p += sprintf(p, "present voltage: %d mV\n",
518 (u32) bst->present_voltage);
519
520 end:
521 kfree(bst);
522
523 len = (p - page);
524 if (len <= off+count) *eof = 1;
525 *start = page + off;
526 len -= off;
527 if (len>count) len = count;
528 if (len<0) len = 0;
529
530 return_VALUE(len);
531 }
532
533
534 static int
535 acpi_battery_read_alarm (
536 char *page,
537 char **start,
538 off_t off,
539 int count,
540 int *eof,
541 void *data)
542 {
543 struct acpi_battery *battery = (struct acpi_battery *) data;
544 char *units = "?";
545 char *p = page;
546 int len = 0;
547
548 ACPI_FUNCTION_TRACE("acpi_battery_read_alarm");
549
550 if (!battery || (off != 0))
551 goto end;
552
553 if (!battery->flags.present) {
554 p += sprintf(p, "present: no\n");
555 goto end;
556 }
557
558 /* Battery Units */
559
560 units = battery->flags.power_unit ? ACPI_BATTERY_UNITS_AMPS : ACPI_BATTERY_UNITS_WATTS;
561
562 /* Battery Alarm */
563
564 p += sprintf(p, "alarm: ");
565 if (!battery->alarm)
566 p += sprintf(p, "unsupported\n");
567 else
568 p += sprintf(p, "%d %sh\n", (u32) battery->alarm, units);
569
570 end:
571 len = (p - page);
572 if (len <= off+count) *eof = 1;
573 *start = page + off;
574 len -= off;
575 if (len>count) len = count;
576 if (len<0) len = 0;
577
578 return_VALUE(len);
579 }
580
581
582 static int
583 acpi_battery_write_alarm (
584 struct file *file,
585 const char __user *buffer,
586 unsigned long count,
587 void *data)
588 {
589 int result = 0;
590 struct acpi_battery *battery = (struct acpi_battery *) data;
591 char alarm_string[12] = {'\0'};
592
593 ACPI_FUNCTION_TRACE("acpi_battery_write_alarm");
594
595 if (!battery || (count > sizeof(alarm_string) - 1))
596 return_VALUE(-EINVAL);
597
598 if (!battery->flags.present)
599 return_VALUE(-ENODEV);
600
601 if (copy_from_user(alarm_string, buffer, count))
602 return_VALUE(-EFAULT);
603
604 alarm_string[count] = '\0';
605
606 result = acpi_battery_set_alarm(battery,
607 simple_strtoul(alarm_string, NULL, 0));
608 if (result)
609 return_VALUE(result);
610
611 return_VALUE(count);
612 }
613
614
615 static int
616 acpi_battery_add_fs (
617 struct acpi_device *device)
618 {
619 struct proc_dir_entry *entry = NULL;
620
621 ACPI_FUNCTION_TRACE("acpi_battery_add_fs");
622
623 if (!acpi_device_dir(device)) {
624 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
625 acpi_battery_dir);
626 if (!acpi_device_dir(device))
627 return_VALUE(-ENODEV);
628 acpi_device_dir(device)->owner = THIS_MODULE;
629 }
630
631 /* 'info' [R] */
632 entry = create_proc_entry(ACPI_BATTERY_FILE_INFO,
633 S_IRUGO, acpi_device_dir(device));
634 if (!entry)
635 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
636 "Unable to create '%s' fs entry\n",
637 ACPI_BATTERY_FILE_INFO));
638 else {
639 entry->read_proc = acpi_battery_read_info;
640 entry->data = acpi_driver_data(device);
641 entry->owner = THIS_MODULE;
642 }
643
644 /* 'status' [R] */
645 entry = create_proc_entry(ACPI_BATTERY_FILE_STATUS,
646 S_IRUGO, acpi_device_dir(device));
647 if (!entry)
648 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
649 "Unable to create '%s' fs entry\n",
650 ACPI_BATTERY_FILE_STATUS));
651 else {
652 entry->read_proc = acpi_battery_read_state;
653 entry->data = acpi_driver_data(device);
654 entry->owner = THIS_MODULE;
655 }
656
657 /* 'alarm' [R/W] */
658 entry = create_proc_entry(ACPI_BATTERY_FILE_ALARM,
659 S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
660 if (!entry)
661 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
662 "Unable to create '%s' fs entry\n",
663 ACPI_BATTERY_FILE_ALARM));
664 else {
665 entry->read_proc = acpi_battery_read_alarm;
666 entry->write_proc = acpi_battery_write_alarm;
667 entry->data = acpi_driver_data(device);
668 entry->owner = THIS_MODULE;
669 }
670
671 return_VALUE(0);
672 }
673
674
675 static int
676 acpi_battery_remove_fs (
677 struct acpi_device *device)
678 {
679 ACPI_FUNCTION_TRACE("acpi_battery_remove_fs");
680
681 if (acpi_device_dir(device)) {
682 remove_proc_entry(ACPI_BATTERY_FILE_ALARM,
683 acpi_device_dir(device));
684 remove_proc_entry(ACPI_BATTERY_FILE_STATUS,
685 acpi_device_dir(device));
686 remove_proc_entry(ACPI_BATTERY_FILE_INFO,
687 acpi_device_dir(device));
688
689 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
690 acpi_device_dir(device) = NULL;
691 }
692
693 return_VALUE(0);
694 }
695
696
697 /* --------------------------------------------------------------------------
698 Driver Interface
699 -------------------------------------------------------------------------- */
700
701 static void
702 acpi_battery_notify (
703 acpi_handle handle,
704 u32 event,
705 void *data)
706 {
707 struct acpi_battery *battery = (struct acpi_battery *) data;
708 struct acpi_device *device = NULL;
709
710 ACPI_FUNCTION_TRACE("acpi_battery_notify");
711
712 if (!battery)
713 return_VOID;
714
715 if (acpi_bus_get_device(handle, &device))
716 return_VOID;
717
718 switch (event) {
719 case ACPI_BATTERY_NOTIFY_STATUS:
720 case ACPI_BATTERY_NOTIFY_INFO:
721 acpi_battery_check(battery);
722 acpi_bus_generate_event(device, event, battery->flags.present);
723 break;
724 default:
725 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
726 "Unsupported event [0x%x]\n", event));
727 break;
728 }
729
730 return_VOID;
731 }
732
733
734 static int
735 acpi_battery_add (
736 struct acpi_device *device)
737 {
738 int result = 0;
739 acpi_status status = 0;
740 struct acpi_battery *battery = NULL;
741
742 ACPI_FUNCTION_TRACE("acpi_battery_add");
743
744 if (!device)
745 return_VALUE(-EINVAL);
746
747 battery = kmalloc(sizeof(struct acpi_battery), GFP_KERNEL);
748 if (!battery)
749 return_VALUE(-ENOMEM);
750 memset(battery, 0, sizeof(struct acpi_battery));
751
752 battery->handle = device->handle;
753 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
754 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
755 acpi_driver_data(device) = battery;
756
757 result = acpi_battery_check(battery);
758 if (result)
759 goto end;
760
761 result = acpi_battery_add_fs(device);
762 if (result)
763 goto end;
764
765 status = acpi_install_notify_handler(battery->handle,
766 ACPI_DEVICE_NOTIFY, acpi_battery_notify, battery);
767 if (ACPI_FAILURE(status)) {
768 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
769 "Error installing notify handler\n"));
770 result = -ENODEV;
771 goto end;
772 }
773
774 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
775 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
776 device->status.battery_present?"present":"absent");
777
778 end:
779 if (result) {
780 acpi_battery_remove_fs(device);
781 kfree(battery);
782 }
783
784 return_VALUE(result);
785 }
786
787
788 static int
789 acpi_battery_remove (
790 struct acpi_device *device,
791 int type)
792 {
793 acpi_status status = 0;
794 struct acpi_battery *battery = NULL;
795
796 ACPI_FUNCTION_TRACE("acpi_battery_remove");
797
798 if (!device || !acpi_driver_data(device))
799 return_VALUE(-EINVAL);
800
801 battery = (struct acpi_battery *) acpi_driver_data(device);
802
803 status = acpi_remove_notify_handler(battery->handle,
804 ACPI_DEVICE_NOTIFY, acpi_battery_notify);
805 if (ACPI_FAILURE(status))
806 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
807 "Error removing notify handler\n"));
808
809 acpi_battery_remove_fs(device);
810
811 kfree(battery);
812
813 return_VALUE(0);
814 }
815
816
817 static int __init
818 acpi_battery_init (void)
819 {
820 int result = 0;
821
822 ACPI_FUNCTION_TRACE("acpi_battery_init");
823
824 acpi_battery_dir = proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
825 if (!acpi_battery_dir)
826 return_VALUE(-ENODEV);
827 acpi_battery_dir->owner = THIS_MODULE;
828
829 result = acpi_bus_register_driver(&acpi_battery_driver);
830 if (result < 0) {
831 remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
832 return_VALUE(-ENODEV);
833 }
834
835 return_VALUE(0);
836 }
837
838
839 static void __exit
840 acpi_battery_exit (void)
841 {
842 ACPI_FUNCTION_TRACE("acpi_battery_exit");
843
844 acpi_bus_unregister_driver(&acpi_battery_driver);
845
846 remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
847
848 return_VOID;
849 }
850
851
852 module_init(acpi_battery_init);
853 module_exit(acpi_battery_exit);
MOXA 2.6.9 from sdlinux-moxaart.tgz