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ACPI: battery: Update battery information upon sysfs read.
[linux-2.6/kmemtrace.git] / drivers / acpi / battery.c
blob9da8cec80fd1e6fdab66b6e0aa804052ceeab589
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("LiP", battery->type))
129 return POWER_SUPPLY_TECHNOLOGY_LIPO;
130 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
131 }
132
133 static int acpi_battery_update(struct acpi_battery *battery);
134
135 static int acpi_battery_get_property(struct power_supply *psy,
136 enum power_supply_property psp,
137 union power_supply_propval *val)
138 {
139 struct acpi_battery *battery = to_acpi_battery(psy);
140
141 if ((!acpi_battery_present(battery)) &&
142 psp != POWER_SUPPLY_PROP_PRESENT)
143 return -ENODEV;
144 acpi_battery_update(battery);
145 switch (psp) {
146 case POWER_SUPPLY_PROP_STATUS:
147 if (battery->state & 0x01)
148 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
149 else if (battery->state & 0x02)
150 val->intval = POWER_SUPPLY_STATUS_CHARGING;
151 else if (battery->state == 0)
152 val->intval = POWER_SUPPLY_STATUS_FULL;
153 break;
154 case POWER_SUPPLY_PROP_PRESENT:
155 val->intval = acpi_battery_present(battery);
156 break;
157 case POWER_SUPPLY_PROP_TECHNOLOGY:
158 val->intval = acpi_battery_technology(battery);
159 break;
160 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
161 val->intval = battery->design_voltage * 1000;
162 break;
163 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
164 val->intval = battery->voltage_now * 1000;
165 break;
166 case POWER_SUPPLY_PROP_CURRENT_NOW:
167 val->intval = battery->current_now * 1000;
168 break;
169 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
170 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
171 val->intval = battery->design_capacity * 1000;
172 break;
173 case POWER_SUPPLY_PROP_CHARGE_FULL:
174 case POWER_SUPPLY_PROP_ENERGY_FULL:
175 val->intval = battery->full_charge_capacity * 1000;
176 break;
177 case POWER_SUPPLY_PROP_CHARGE_NOW:
178 case POWER_SUPPLY_PROP_ENERGY_NOW:
179 val->intval = battery->capacity_now * 1000;
180 break;
181 case POWER_SUPPLY_PROP_MODEL_NAME:
182 val->strval = battery->model_number;
183 break;
184 case POWER_SUPPLY_PROP_MANUFACTURER:
185 val->strval = battery->oem_info;
186 break;
187 default:
188 return -EINVAL;
189 }
190 return 0;
191 }
192
193 static enum power_supply_property charge_battery_props[] = {
194 POWER_SUPPLY_PROP_STATUS,
195 POWER_SUPPLY_PROP_PRESENT,
196 POWER_SUPPLY_PROP_TECHNOLOGY,
197 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
198 POWER_SUPPLY_PROP_VOLTAGE_NOW,
199 POWER_SUPPLY_PROP_CURRENT_NOW,
200 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
201 POWER_SUPPLY_PROP_CHARGE_FULL,
202 POWER_SUPPLY_PROP_CHARGE_NOW,
203 POWER_SUPPLY_PROP_MODEL_NAME,
204 POWER_SUPPLY_PROP_MANUFACTURER,
205 };
206
207 static enum power_supply_property energy_battery_props[] = {
208 POWER_SUPPLY_PROP_STATUS,
209 POWER_SUPPLY_PROP_PRESENT,
210 POWER_SUPPLY_PROP_TECHNOLOGY,
211 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
212 POWER_SUPPLY_PROP_VOLTAGE_NOW,
213 POWER_SUPPLY_PROP_CURRENT_NOW,
214 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
215 POWER_SUPPLY_PROP_ENERGY_FULL,
216 POWER_SUPPLY_PROP_ENERGY_NOW,
217 POWER_SUPPLY_PROP_MODEL_NAME,
218 POWER_SUPPLY_PROP_MANUFACTURER,
219 };
220
221 #ifdef CONFIG_ACPI_PROCFS
222 inline char *acpi_battery_units(struct acpi_battery *battery)
223 {
224 return (battery->power_unit)?"mA":"mW";
225 }
226 #endif
227
228 /* --------------------------------------------------------------------------
229 Battery Management
230 -------------------------------------------------------------------------- */
231 struct acpi_offsets {
232 size_t offset; /* offset inside struct acpi_sbs_battery */
233 u8 mode; /* int or string? */
234 };
235
236 static struct acpi_offsets state_offsets[] = {
237 {offsetof(struct acpi_battery, state), 0},
238 {offsetof(struct acpi_battery, current_now), 0},
239 {offsetof(struct acpi_battery, capacity_now), 0},
240 {offsetof(struct acpi_battery, voltage_now), 0},
241 };
242
243 static struct acpi_offsets info_offsets[] = {
244 {offsetof(struct acpi_battery, power_unit), 0},
245 {offsetof(struct acpi_battery, design_capacity), 0},
246 {offsetof(struct acpi_battery, full_charge_capacity), 0},
247 {offsetof(struct acpi_battery, technology), 0},
248 {offsetof(struct acpi_battery, design_voltage), 0},
249 {offsetof(struct acpi_battery, design_capacity_warning), 0},
250 {offsetof(struct acpi_battery, design_capacity_low), 0},
251 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
252 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
253 {offsetof(struct acpi_battery, model_number), 1},
254 {offsetof(struct acpi_battery, serial_number), 1},
255 {offsetof(struct acpi_battery, type), 1},
256 {offsetof(struct acpi_battery, oem_info), 1},
257 };
258
259 static int extract_package(struct acpi_battery *battery,
260 union acpi_object *package,
261 struct acpi_offsets *offsets, int num)
262 {
263 int i, *x;
264 union acpi_object *element;
265 if (package->type != ACPI_TYPE_PACKAGE)
266 return -EFAULT;
267 for (i = 0; i < num; ++i) {
268 if (package->package.count <= i)
269 return -EFAULT;
270 element = &package->package.elements[i];
271 if (offsets[i].mode) {
272 if (element->type != ACPI_TYPE_STRING &&
273 element->type != ACPI_TYPE_BUFFER)
274 return -EFAULT;
275 strncpy((u8 *)battery + offsets[i].offset,
276 element->string.pointer, 32);
277 } else {
278 if (element->type != ACPI_TYPE_INTEGER)
279 return -EFAULT;
280 x = (int *)((u8 *)battery + offsets[i].offset);
281 *x = element->integer.value;
282 }
283 }
284 return 0;
285 }
286
287 static int acpi_battery_get_status(struct acpi_battery *battery)
288 {
289 if (acpi_bus_get_status(battery->device)) {
290 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
291 return -ENODEV;
292 }
293 return 0;
294 }
295
296 static int acpi_battery_get_info(struct acpi_battery *battery)
297 {
298 int result = -EFAULT;
299 acpi_status status = 0;
300 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
301
302 if (!acpi_battery_present(battery))
303 return 0;
304 mutex_lock(&battery->lock);
305 status = acpi_evaluate_object(battery->device->handle, "_BIF",
306 NULL, &buffer);
307 mutex_unlock(&battery->lock);
308
309 if (ACPI_FAILURE(status)) {
310 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
311 return -ENODEV;
312 }
313
314 result = extract_package(battery, buffer.pointer,
315 info_offsets, ARRAY_SIZE(info_offsets));
316 kfree(buffer.pointer);
317 return result;
318 }
319
320 static int acpi_battery_get_state(struct acpi_battery *battery)
321 {
322 int result = 0;
323 acpi_status status = 0;
324 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
325
326 if (!acpi_battery_present(battery))
327 return 0;
328
329 if (battery->update_time &&
330 time_before(jiffies, battery->update_time +
331 msecs_to_jiffies(cache_time)))
332 return 0;
333
334 mutex_lock(&battery->lock);
335 status = acpi_evaluate_object(battery->device->handle, "_BST",
336 NULL, &buffer);
337 mutex_unlock(&battery->lock);
338
339 if (ACPI_FAILURE(status)) {
340 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
341 return -ENODEV;
342 }
343
344 result = extract_package(battery, buffer.pointer,
345 state_offsets, ARRAY_SIZE(state_offsets));
346 battery->update_time = jiffies;
347 kfree(buffer.pointer);
348 return result;
349 }
350
351 static int acpi_battery_set_alarm(struct acpi_battery *battery)
352 {
353 acpi_status status = 0;
354 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
355 struct acpi_object_list arg_list = { 1, &arg0 };
356
357 if (!acpi_battery_present(battery)|| !battery->alarm_present)
358 return -ENODEV;
359
360 arg0.integer.value = battery->alarm;
361
362 mutex_lock(&battery->lock);
363 status = acpi_evaluate_object(battery->device->handle, "_BTP",
364 &arg_list, NULL);
365 mutex_unlock(&battery->lock);
366
367 if (ACPI_FAILURE(status))
368 return -ENODEV;
369
370 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
371 return 0;
372 }
373
374 static int acpi_battery_init_alarm(struct acpi_battery *battery)
375 {
376 acpi_status status = AE_OK;
377 acpi_handle handle = NULL;
378
379 /* See if alarms are supported, and if so, set default */
380 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
381 if (ACPI_FAILURE(status)) {
382 battery->alarm_present = 0;
383 return 0;
384 }
385 battery->alarm_present = 1;
386 if (!battery->alarm)
387 battery->alarm = battery->design_capacity_warning;
388 return acpi_battery_set_alarm(battery);
389 }
390
391 static int acpi_battery_update(struct acpi_battery *battery)
392 {
393 int saved_present = acpi_battery_present(battery);
394 int result = acpi_battery_get_status(battery);
395 if (result || !acpi_battery_present(battery))
396 return result;
397 if (saved_present != acpi_battery_present(battery) ||
398 !battery->update_time) {
399 battery->update_time = 0;
400 result = acpi_battery_get_info(battery);
401 if (result)
402 return result;
403 if (battery->power_unit) {
404 battery->bat.properties = charge_battery_props;
405 battery->bat.num_properties =
406 ARRAY_SIZE(charge_battery_props);
407 } else {
408 battery->bat.properties = energy_battery_props;
409 battery->bat.num_properties =
410 ARRAY_SIZE(energy_battery_props);
411 }
412 acpi_battery_init_alarm(battery);
413 }
414 return acpi_battery_get_state(battery);
415 }
416
417 /* --------------------------------------------------------------------------
418 FS Interface (/proc)
419 -------------------------------------------------------------------------- */
420
421 #ifdef CONFIG_ACPI_PROCFS
422 static struct proc_dir_entry *acpi_battery_dir;
423
424 static int acpi_battery_print_info(struct seq_file *seq, int result)
425 {
426 struct acpi_battery *battery = seq->private;
427
428 if (result)
429 goto end;
430
431 seq_printf(seq, "present: %s\n",
432 acpi_battery_present(battery)?"yes":"no");
433 if (!acpi_battery_present(battery))
434 goto end;
435 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
436 seq_printf(seq, "design capacity: unknown\n");
437 else
438 seq_printf(seq, "design capacity: %d %sh\n",
439 battery->design_capacity,
440 acpi_battery_units(battery));
441
442 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
443 seq_printf(seq, "last full capacity: unknown\n");
444 else
445 seq_printf(seq, "last full capacity: %d %sh\n",
446 battery->full_charge_capacity,
447 acpi_battery_units(battery));
448
449 seq_printf(seq, "battery technology: %srechargeable\n",
450 (!battery->technology)?"non-":"");
451
452 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
453 seq_printf(seq, "design voltage: unknown\n");
454 else
455 seq_printf(seq, "design voltage: %d mV\n",
456 battery->design_voltage);
457 seq_printf(seq, "design capacity warning: %d %sh\n",
458 battery->design_capacity_warning,
459 acpi_battery_units(battery));
460 seq_printf(seq, "design capacity low: %d %sh\n",
461 battery->design_capacity_low,
462 acpi_battery_units(battery));
463 seq_printf(seq, "capacity granularity 1: %d %sh\n",
464 battery->capacity_granularity_1,
465 acpi_battery_units(battery));
466 seq_printf(seq, "capacity granularity 2: %d %sh\n",
467 battery->capacity_granularity_2,
468 acpi_battery_units(battery));
469 seq_printf(seq, "model number: %s\n", battery->model_number);
470 seq_printf(seq, "serial number: %s\n", battery->serial_number);
471 seq_printf(seq, "battery type: %s\n", battery->type);
472 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
473 end:
474 if (result)
475 seq_printf(seq, "ERROR: Unable to read battery info\n");
476 return result;
477 }
478
479 static int acpi_battery_print_state(struct seq_file *seq, int result)
480 {
481 struct acpi_battery *battery = seq->private;
482
483 if (result)
484 goto end;
485
486 seq_printf(seq, "present: %s\n",
487 acpi_battery_present(battery)?"yes":"no");
488 if (!acpi_battery_present(battery))
489 goto end;
490
491 seq_printf(seq, "capacity state: %s\n",
492 (battery->state & 0x04)?"critical":"ok");
493 if ((battery->state & 0x01) && (battery->state & 0x02))
494 seq_printf(seq,
495 "charging state: charging/discharging\n");
496 else if (battery->state & 0x01)
497 seq_printf(seq, "charging state: discharging\n");
498 else if (battery->state & 0x02)
499 seq_printf(seq, "charging state: charging\n");
500 else
501 seq_printf(seq, "charging state: charged\n");
502
503 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
504 seq_printf(seq, "present rate: unknown\n");
505 else
506 seq_printf(seq, "present rate: %d %s\n",
507 battery->current_now, acpi_battery_units(battery));
508
509 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
510 seq_printf(seq, "remaining capacity: unknown\n");
511 else
512 seq_printf(seq, "remaining capacity: %d %sh\n",
513 battery->capacity_now, acpi_battery_units(battery));
514 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
515 seq_printf(seq, "present voltage: unknown\n");
516 else
517 seq_printf(seq, "present voltage: %d mV\n",
518 battery->voltage_now);
519 end:
520 if (result)
521 seq_printf(seq, "ERROR: Unable to read battery state\n");
522
523 return result;
524 }
525
526 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
527 {
528 struct acpi_battery *battery = seq->private;
529
530 if (result)
531 goto end;
532
533 if (!acpi_battery_present(battery)) {
534 seq_printf(seq, "present: no\n");
535 goto end;
536 }
537 seq_printf(seq, "alarm: ");
538 if (!battery->alarm)
539 seq_printf(seq, "unsupported\n");
540 else
541 seq_printf(seq, "%u %sh\n", battery->alarm,
542 acpi_battery_units(battery));
543 end:
544 if (result)
545 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
546 return result;
547 }
548
549 static ssize_t acpi_battery_write_alarm(struct file *file,
550 const char __user * buffer,
551 size_t count, loff_t * ppos)
552 {
553 int result = 0;
554 char alarm_string[12] = { '\0' };
555 struct seq_file *m = file->private_data;
556 struct acpi_battery *battery = m->private;
557
558 if (!battery || (count > sizeof(alarm_string) - 1))
559 return -EINVAL;
560 if (!acpi_battery_present(battery)) {
561 result = -ENODEV;
562 goto end;
563 }
564 if (copy_from_user(alarm_string, buffer, count)) {
565 result = -EFAULT;
566 goto end;
567 }
568 alarm_string[count] = '\0';
569 battery->alarm = simple_strtol(alarm_string, NULL, 0);
570 result = acpi_battery_set_alarm(battery);
571 end:
572 if (!result)
573 return count;
574 return result;
575 }
576
577 typedef int(*print_func)(struct seq_file *seq, int result);
578
579 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
580 acpi_battery_print_info,
581 acpi_battery_print_state,
582 acpi_battery_print_alarm,
583 };
584
585 static int acpi_battery_read(int fid, struct seq_file *seq)
586 {
587 struct acpi_battery *battery = seq->private;
588 int result = acpi_battery_update(battery);
589 return acpi_print_funcs[fid](seq, result);
590 }
591
592 #define DECLARE_FILE_FUNCTIONS(_name) \
593 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
594 { \
595 return acpi_battery_read(_name##_tag, seq); \
596 } \
597 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
598 { \
599 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
600 }
601
602 DECLARE_FILE_FUNCTIONS(info);
603 DECLARE_FILE_FUNCTIONS(state);
604 DECLARE_FILE_FUNCTIONS(alarm);
605
606 #undef DECLARE_FILE_FUNCTIONS
607
608 #define FILE_DESCRIPTION_RO(_name) \
609 { \
610 .name = __stringify(_name), \
611 .mode = S_IRUGO, \
612 .ops = { \
613 .open = acpi_battery_##_name##_open_fs, \
614 .read = seq_read, \
615 .llseek = seq_lseek, \
616 .release = single_release, \
617 .owner = THIS_MODULE, \
618 }, \
619 }
620
621 #define FILE_DESCRIPTION_RW(_name) \
622 { \
623 .name = __stringify(_name), \
624 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
625 .ops = { \
626 .open = acpi_battery_##_name##_open_fs, \
627 .read = seq_read, \
628 .llseek = seq_lseek, \
629 .write = acpi_battery_write_##_name, \
630 .release = single_release, \
631 .owner = THIS_MODULE, \
632 }, \
633 }
634
635 static struct battery_file {
636 struct file_operations ops;
637 mode_t mode;
638 char *name;
639 } acpi_battery_file[] = {
640 FILE_DESCRIPTION_RO(info),
641 FILE_DESCRIPTION_RO(state),
642 FILE_DESCRIPTION_RW(alarm),
643 };
644
645 #undef FILE_DESCRIPTION_RO
646 #undef FILE_DESCRIPTION_RW
647
648 static int acpi_battery_add_fs(struct acpi_device *device)
649 {
650 struct proc_dir_entry *entry = NULL;
651 int i;
652
653 if (!acpi_device_dir(device)) {
654 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
655 acpi_battery_dir);
656 if (!acpi_device_dir(device))
657 return -ENODEV;
658 acpi_device_dir(device)->owner = THIS_MODULE;
659 }
660
661 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
662 entry = create_proc_entry(acpi_battery_file[i].name,
663 acpi_battery_file[i].mode, acpi_device_dir(device));
664 if (!entry)
665 return -ENODEV;
666 else {
667 entry->proc_fops = &acpi_battery_file[i].ops;
668 entry->data = acpi_driver_data(device);
669 entry->owner = THIS_MODULE;
670 }
671 }
672 return 0;
673 }
674
675 static void acpi_battery_remove_fs(struct acpi_device *device)
676 {
677 int i;
678 if (!acpi_device_dir(device))
679 return;
680 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
681 remove_proc_entry(acpi_battery_file[i].name,
682 acpi_device_dir(device));
683
684 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
685 acpi_device_dir(device) = NULL;
686 }
687
688 #endif
689
690 static ssize_t acpi_battery_alarm_show(struct device *dev,
691 struct device_attribute *attr,
692 char *buf)
693 {
694 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
695 return sprintf(buf, "%d\n", battery->alarm * 1000);
696 }
697
698 static ssize_t acpi_battery_alarm_store(struct device *dev,
699 struct device_attribute *attr,
700 const char *buf, size_t count)
701 {
702 unsigned long x;
703 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
704 if (sscanf(buf, "%ld\n", &x) == 1)
705 battery->alarm = x/1000;
706 if (acpi_battery_present(battery))
707 acpi_battery_set_alarm(battery);
708 return count;
709 }
710
711 static struct device_attribute alarm_attr = {
712 .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
713 .show = acpi_battery_alarm_show,
714 .store = acpi_battery_alarm_store,
715 };
716
717 /* --------------------------------------------------------------------------
718 Driver Interface
719 -------------------------------------------------------------------------- */
720
721 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
722 {
723 struct acpi_battery *battery = data;
724 struct acpi_device *device;
725 if (!battery)
726 return;
727 device = battery->device;
728 acpi_battery_update(battery);
729 acpi_bus_generate_proc_event(device, event,
730 acpi_battery_present(battery));
731 acpi_bus_generate_netlink_event(device->pnp.device_class,
732 device->dev.bus_id, event,
733 acpi_battery_present(battery));
734 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
735 }
736
737 static int acpi_battery_add(struct acpi_device *device)
738 {
739 int result = 0;
740 acpi_status status = 0;
741 struct acpi_battery *battery = NULL;
742 if (!device)
743 return -EINVAL;
744 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
745 if (!battery)
746 return -ENOMEM;
747 battery->device = device;
748 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
749 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
750 acpi_driver_data(device) = battery;
751 mutex_init(&battery->lock);
752 acpi_battery_update(battery);
753 #ifdef CONFIG_ACPI_PROCFS
754 result = acpi_battery_add_fs(device);
755 if (result)
756 goto end;
757 #endif
758 battery->bat.name = acpi_device_bid(device);
759 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
760 battery->bat.get_property = acpi_battery_get_property;
761 result = power_supply_register(&battery->device->dev, &battery->bat);
762 result = device_create_file(battery->bat.dev, &alarm_attr);
763 status = acpi_install_notify_handler(device->handle,
764 ACPI_ALL_NOTIFY,
765 acpi_battery_notify, battery);
766 if (ACPI_FAILURE(status)) {
767 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
768 result = -ENODEV;
769 goto end;
770 }
771 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
772 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
773 device->status.battery_present ? "present" : "absent");
774 end:
775 if (result) {
776 #ifdef CONFIG_ACPI_PROCFS
777 acpi_battery_remove_fs(device);
778 #endif
779 kfree(battery);
780 }
781 return result;
782 }
783
784 static int acpi_battery_remove(struct acpi_device *device, int type)
785 {
786 acpi_status status = 0;
787 struct acpi_battery *battery = NULL;
788
789 if (!device || !acpi_driver_data(device))
790 return -EINVAL;
791 battery = acpi_driver_data(device);
792 status = acpi_remove_notify_handler(device->handle,
793 ACPI_ALL_NOTIFY,
794 acpi_battery_notify);
795 #ifdef CONFIG_ACPI_PROCFS
796 acpi_battery_remove_fs(device);
797 #endif
798 if (battery->bat.dev) {
799 device_remove_file(battery->bat.dev, &alarm_attr);
800 power_supply_unregister(&battery->bat);
801 }
802 mutex_destroy(&battery->lock);
803 kfree(battery);
804 return 0;
805 }
806
807 /* this is needed to learn about changes made in suspended state */
808 static int acpi_battery_resume(struct acpi_device *device)
809 {
810 struct acpi_battery *battery;
811 if (!device)
812 return -EINVAL;
813 battery = acpi_driver_data(device);
814 battery->update_time = 0;
815 return 0;
816 }
817
818 static struct acpi_driver acpi_battery_driver = {
819 .name = "battery",
820 .class = ACPI_BATTERY_CLASS,
821 .ids = battery_device_ids,
822 .ops = {
823 .add = acpi_battery_add,
824 .resume = acpi_battery_resume,
825 .remove = acpi_battery_remove,
826 },
827 };
828
829 static int __init acpi_battery_init(void)
830 {
831 if (acpi_disabled)
832 return -ENODEV;
833 #ifdef CONFIG_ACPI_PROCFS
834 acpi_battery_dir = acpi_lock_battery_dir();
835 if (!acpi_battery_dir)
836 return -ENODEV;
837 #endif
838 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
839 #ifdef CONFIG_ACPI_PROCFS
840 acpi_unlock_battery_dir(acpi_battery_dir);
841 #endif
842 return -ENODEV;
843 }
844 return 0;
845 }
846
847 static void __exit acpi_battery_exit(void)
848 {
849 acpi_bus_unregister_driver(&acpi_battery_driver);
850 #ifdef CONFIG_ACPI_PROCFS
851 acpi_unlock_battery_dir(acpi_battery_dir);
852 #endif
853 }
854
855 module_init(acpi_battery_init);
856 module_exit(acpi_battery_exit);
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