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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / acpi / battery.c
blob69cbc57c2d1cd248e7431bb40661e9ea139efbb7
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_POWER
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 #ifdef CONFIG_ACPI_SYSFS_POWER
44 #include <linux/power_supply.h>
45 #endif
46
47 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
48
49 #define ACPI_BATTERY_CLASS "battery"
50 #define ACPI_BATTERY_DEVICE_NAME "Battery"
51 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
52 #define ACPI_BATTERY_NOTIFY_INFO 0x81
53
54 #define _COMPONENT ACPI_BATTERY_COMPONENT
55
56 ACPI_MODULE_NAME("battery");
57
58 MODULE_AUTHOR("Paul Diefenbaugh");
59 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
60 MODULE_DESCRIPTION("ACPI Battery Driver");
61 MODULE_LICENSE("GPL");
62
63 static unsigned int cache_time = 1000;
64 module_param(cache_time, uint, 0644);
65 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
66
67 #ifdef CONFIG_ACPI_PROCFS_POWER
68 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
69 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
70
71 enum acpi_battery_files {
72 info_tag = 0,
73 state_tag,
74 alarm_tag,
75 ACPI_BATTERY_NUMFILES,
76 };
77
78 #endif
79
80 static const struct acpi_device_id battery_device_ids[] = {
81 {"PNP0C0A", 0},
82 {"", 0},
83 };
84
85 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
86
87
88 struct acpi_battery {
89 struct mutex lock;
90 #ifdef CONFIG_ACPI_SYSFS_POWER
91 struct power_supply bat;
92 #endif
93 struct acpi_device *device;
94 unsigned long update_time;
95 int current_now;
96 int capacity_now;
97 int voltage_now;
98 int design_capacity;
99 int full_charge_capacity;
100 int technology;
101 int design_voltage;
102 int design_capacity_warning;
103 int design_capacity_low;
104 int capacity_granularity_1;
105 int capacity_granularity_2;
106 int alarm;
107 char model_number[32];
108 char serial_number[32];
109 char type[32];
110 char oem_info[32];
111 int state;
112 int power_unit;
113 u8 alarm_present;
114 };
115
116 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
117
118 inline int acpi_battery_present(struct acpi_battery *battery)
119 {
120 return battery->device->status.battery_present;
121 }
122
123 #ifdef CONFIG_ACPI_SYSFS_POWER
124 static int acpi_battery_technology(struct acpi_battery *battery)
125 {
126 if (!strcasecmp("NiCd", battery->type))
127 return POWER_SUPPLY_TECHNOLOGY_NiCd;
128 if (!strcasecmp("NiMH", battery->type))
129 return POWER_SUPPLY_TECHNOLOGY_NiMH;
130 if (!strcasecmp("LION", battery->type))
131 return POWER_SUPPLY_TECHNOLOGY_LION;
132 if (!strncasecmp("LI-ION", battery->type, 6))
133 return POWER_SUPPLY_TECHNOLOGY_LION;
134 if (!strcasecmp("LiP", battery->type))
135 return POWER_SUPPLY_TECHNOLOGY_LIPO;
136 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
137 }
138
139 static int acpi_battery_get_state(struct acpi_battery *battery);
140
141 static int acpi_battery_is_charged(struct acpi_battery *battery)
142 {
143 /* either charging or discharging */
144 if (battery->state != 0)
145 return 0;
146
147 /* battery not reporting charge */
148 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
149 battery->capacity_now == 0)
150 return 0;
151
152 /* good batteries update full_charge as the batteries degrade */
153 if (battery->full_charge_capacity == battery->capacity_now)
154 return 1;
155
156 /* fallback to using design values for broken batteries */
157 if (battery->design_capacity == battery->capacity_now)
158 return 1;
159
160 /* we don't do any sort of metric based on percentages */
161 return 0;
162 }
163
164 static int acpi_battery_get_property(struct power_supply *psy,
165 enum power_supply_property psp,
166 union power_supply_propval *val)
167 {
168 struct acpi_battery *battery = to_acpi_battery(psy);
169
170 if (acpi_battery_present(battery)) {
171 /* run battery update only if it is present */
172 acpi_battery_get_state(battery);
173 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
174 return -ENODEV;
175 switch (psp) {
176 case POWER_SUPPLY_PROP_STATUS:
177 if (battery->state & 0x01)
178 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
179 else if (battery->state & 0x02)
180 val->intval = POWER_SUPPLY_STATUS_CHARGING;
181 else if (acpi_battery_is_charged(battery))
182 val->intval = POWER_SUPPLY_STATUS_FULL;
183 else
184 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
185 break;
186 case POWER_SUPPLY_PROP_PRESENT:
187 val->intval = acpi_battery_present(battery);
188 break;
189 case POWER_SUPPLY_PROP_TECHNOLOGY:
190 val->intval = acpi_battery_technology(battery);
191 break;
192 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
193 val->intval = battery->design_voltage * 1000;
194 break;
195 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
196 val->intval = battery->voltage_now * 1000;
197 break;
198 case POWER_SUPPLY_PROP_CURRENT_NOW:
199 val->intval = battery->current_now * 1000;
200 break;
201 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
202 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
203 val->intval = battery->design_capacity * 1000;
204 break;
205 case POWER_SUPPLY_PROP_CHARGE_FULL:
206 case POWER_SUPPLY_PROP_ENERGY_FULL:
207 val->intval = battery->full_charge_capacity * 1000;
208 break;
209 case POWER_SUPPLY_PROP_CHARGE_NOW:
210 case POWER_SUPPLY_PROP_ENERGY_NOW:
211 val->intval = battery->capacity_now * 1000;
212 break;
213 case POWER_SUPPLY_PROP_MODEL_NAME:
214 val->strval = battery->model_number;
215 break;
216 case POWER_SUPPLY_PROP_MANUFACTURER:
217 val->strval = battery->oem_info;
218 break;
219 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
220 val->strval = battery->serial_number;
221 break;
222 default:
223 return -EINVAL;
224 }
225 return 0;
226 }
227
228 static enum power_supply_property charge_battery_props[] = {
229 POWER_SUPPLY_PROP_STATUS,
230 POWER_SUPPLY_PROP_PRESENT,
231 POWER_SUPPLY_PROP_TECHNOLOGY,
232 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
233 POWER_SUPPLY_PROP_VOLTAGE_NOW,
234 POWER_SUPPLY_PROP_CURRENT_NOW,
235 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
236 POWER_SUPPLY_PROP_CHARGE_FULL,
237 POWER_SUPPLY_PROP_CHARGE_NOW,
238 POWER_SUPPLY_PROP_MODEL_NAME,
239 POWER_SUPPLY_PROP_MANUFACTURER,
240 POWER_SUPPLY_PROP_SERIAL_NUMBER,
241 };
242
243 static enum power_supply_property energy_battery_props[] = {
244 POWER_SUPPLY_PROP_STATUS,
245 POWER_SUPPLY_PROP_PRESENT,
246 POWER_SUPPLY_PROP_TECHNOLOGY,
247 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
248 POWER_SUPPLY_PROP_VOLTAGE_NOW,
249 POWER_SUPPLY_PROP_CURRENT_NOW,
250 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
251 POWER_SUPPLY_PROP_ENERGY_FULL,
252 POWER_SUPPLY_PROP_ENERGY_NOW,
253 POWER_SUPPLY_PROP_MODEL_NAME,
254 POWER_SUPPLY_PROP_MANUFACTURER,
255 POWER_SUPPLY_PROP_SERIAL_NUMBER,
256 };
257 #endif
258
259 #ifdef CONFIG_ACPI_PROCFS_POWER
260 inline char *acpi_battery_units(struct acpi_battery *battery)
261 {
262 return (battery->power_unit)?"mA":"mW";
263 }
264 #endif
265
266 /* --------------------------------------------------------------------------
267 Battery Management
268 -------------------------------------------------------------------------- */
269 struct acpi_offsets {
270 size_t offset; /* offset inside struct acpi_sbs_battery */
271 u8 mode; /* int or string? */
272 };
273
274 static struct acpi_offsets state_offsets[] = {
275 {offsetof(struct acpi_battery, state), 0},
276 {offsetof(struct acpi_battery, current_now), 0},
277 {offsetof(struct acpi_battery, capacity_now), 0},
278 {offsetof(struct acpi_battery, voltage_now), 0},
279 };
280
281 static struct acpi_offsets info_offsets[] = {
282 {offsetof(struct acpi_battery, power_unit), 0},
283 {offsetof(struct acpi_battery, design_capacity), 0},
284 {offsetof(struct acpi_battery, full_charge_capacity), 0},
285 {offsetof(struct acpi_battery, technology), 0},
286 {offsetof(struct acpi_battery, design_voltage), 0},
287 {offsetof(struct acpi_battery, design_capacity_warning), 0},
288 {offsetof(struct acpi_battery, design_capacity_low), 0},
289 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
290 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
291 {offsetof(struct acpi_battery, model_number), 1},
292 {offsetof(struct acpi_battery, serial_number), 1},
293 {offsetof(struct acpi_battery, type), 1},
294 {offsetof(struct acpi_battery, oem_info), 1},
295 };
296
297 static int extract_package(struct acpi_battery *battery,
298 union acpi_object *package,
299 struct acpi_offsets *offsets, int num)
300 {
301 int i;
302 union acpi_object *element;
303 if (package->type != ACPI_TYPE_PACKAGE)
304 return -EFAULT;
305 for (i = 0; i < num; ++i) {
306 if (package->package.count <= i)
307 return -EFAULT;
308 element = &package->package.elements[i];
309 if (offsets[i].mode) {
310 u8 *ptr = (u8 *)battery + offsets[i].offset;
311 if (element->type == ACPI_TYPE_STRING ||
312 element->type == ACPI_TYPE_BUFFER)
313 strncpy(ptr, element->string.pointer, 32);
314 else if (element->type == ACPI_TYPE_INTEGER) {
315 strncpy(ptr, (u8 *)&element->integer.value,
316 sizeof(acpi_integer));
317 ptr[sizeof(acpi_integer)] = 0;
318 } else
319 *ptr = 0; /* don't have value */
320 } else {
321 int *x = (int *)((u8 *)battery + offsets[i].offset);
322 *x = (element->type == ACPI_TYPE_INTEGER) ?
323 element->integer.value : -1;
324 }
325 }
326 return 0;
327 }
328
329 static int acpi_battery_get_status(struct acpi_battery *battery)
330 {
331 if (acpi_bus_get_status(battery->device)) {
332 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
333 return -ENODEV;
334 }
335 return 0;
336 }
337
338 static int acpi_battery_get_info(struct acpi_battery *battery)
339 {
340 int result = -EFAULT;
341 acpi_status status = 0;
342 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
343
344 if (!acpi_battery_present(battery))
345 return 0;
346 mutex_lock(&battery->lock);
347 status = acpi_evaluate_object(battery->device->handle, "_BIF",
348 NULL, &buffer);
349 mutex_unlock(&battery->lock);
350
351 if (ACPI_FAILURE(status)) {
352 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
353 return -ENODEV;
354 }
355
356 result = extract_package(battery, buffer.pointer,
357 info_offsets, ARRAY_SIZE(info_offsets));
358 kfree(buffer.pointer);
359 return result;
360 }
361
362 static int acpi_battery_get_state(struct acpi_battery *battery)
363 {
364 int result = 0;
365 acpi_status status = 0;
366 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
367
368 if (!acpi_battery_present(battery))
369 return 0;
370
371 if (battery->update_time &&
372 time_before(jiffies, battery->update_time +
373 msecs_to_jiffies(cache_time)))
374 return 0;
375
376 mutex_lock(&battery->lock);
377 status = acpi_evaluate_object(battery->device->handle, "_BST",
378 NULL, &buffer);
379 mutex_unlock(&battery->lock);
380
381 if (ACPI_FAILURE(status)) {
382 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
383 return -ENODEV;
384 }
385
386 result = extract_package(battery, buffer.pointer,
387 state_offsets, ARRAY_SIZE(state_offsets));
388 battery->update_time = jiffies;
389 kfree(buffer.pointer);
390 return result;
391 }
392
393 static int acpi_battery_set_alarm(struct acpi_battery *battery)
394 {
395 acpi_status status = 0;
396 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
397 struct acpi_object_list arg_list = { 1, &arg0 };
398
399 if (!acpi_battery_present(battery)|| !battery->alarm_present)
400 return -ENODEV;
401
402 arg0.integer.value = battery->alarm;
403
404 mutex_lock(&battery->lock);
405 status = acpi_evaluate_object(battery->device->handle, "_BTP",
406 &arg_list, NULL);
407 mutex_unlock(&battery->lock);
408
409 if (ACPI_FAILURE(status))
410 return -ENODEV;
411
412 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
413 return 0;
414 }
415
416 static int acpi_battery_init_alarm(struct acpi_battery *battery)
417 {
418 acpi_status status = AE_OK;
419 acpi_handle handle = NULL;
420
421 /* See if alarms are supported, and if so, set default */
422 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
423 if (ACPI_FAILURE(status)) {
424 battery->alarm_present = 0;
425 return 0;
426 }
427 battery->alarm_present = 1;
428 if (!battery->alarm)
429 battery->alarm = battery->design_capacity_warning;
430 return acpi_battery_set_alarm(battery);
431 }
432
433 #ifdef CONFIG_ACPI_SYSFS_POWER
434 static ssize_t acpi_battery_alarm_show(struct device *dev,
435 struct device_attribute *attr,
436 char *buf)
437 {
438 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
439 return sprintf(buf, "%d\n", battery->alarm * 1000);
440 }
441
442 static ssize_t acpi_battery_alarm_store(struct device *dev,
443 struct device_attribute *attr,
444 const char *buf, size_t count)
445 {
446 unsigned long x;
447 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
448 if (sscanf(buf, "%ld\n", &x) == 1)
449 battery->alarm = x/1000;
450 if (acpi_battery_present(battery))
451 acpi_battery_set_alarm(battery);
452 return count;
453 }
454
455 static struct device_attribute alarm_attr = {
456 .attr = {.name = "alarm", .mode = 0644},
457 .show = acpi_battery_alarm_show,
458 .store = acpi_battery_alarm_store,
459 };
460
461 static int sysfs_add_battery(struct acpi_battery *battery)
462 {
463 int result;
464
465 if (battery->power_unit) {
466 battery->bat.properties = charge_battery_props;
467 battery->bat.num_properties =
468 ARRAY_SIZE(charge_battery_props);
469 } else {
470 battery->bat.properties = energy_battery_props;
471 battery->bat.num_properties =
472 ARRAY_SIZE(energy_battery_props);
473 }
474
475 battery->bat.name = acpi_device_bid(battery->device);
476 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
477 battery->bat.get_property = acpi_battery_get_property;
478
479 result = power_supply_register(&battery->device->dev, &battery->bat);
480 if (result)
481 return result;
482 return device_create_file(battery->bat.dev, &alarm_attr);
483 }
484
485 static void sysfs_remove_battery(struct acpi_battery *battery)
486 {
487 if (!battery->bat.dev)
488 return;
489 device_remove_file(battery->bat.dev, &alarm_attr);
490 power_supply_unregister(&battery->bat);
491 battery->bat.dev = NULL;
492 }
493 #endif
494
495 static int acpi_battery_update(struct acpi_battery *battery)
496 {
497 int result, old_present = acpi_battery_present(battery);
498 result = acpi_battery_get_status(battery);
499 if (result)
500 return result;
501 #ifdef CONFIG_ACPI_SYSFS_POWER
502 if (!acpi_battery_present(battery)) {
503 sysfs_remove_battery(battery);
504 battery->update_time = 0;
505 return 0;
506 }
507 #endif
508 if (!battery->update_time ||
509 old_present != acpi_battery_present(battery)) {
510 result = acpi_battery_get_info(battery);
511 if (result)
512 return result;
513 acpi_battery_init_alarm(battery);
514 }
515 #ifdef CONFIG_ACPI_SYSFS_POWER
516 if (!battery->bat.dev)
517 sysfs_add_battery(battery);
518 #endif
519 return acpi_battery_get_state(battery);
520 }
521
522 /* --------------------------------------------------------------------------
523 FS Interface (/proc)
524 -------------------------------------------------------------------------- */
525
526 #ifdef CONFIG_ACPI_PROCFS_POWER
527 static struct proc_dir_entry *acpi_battery_dir;
528
529 static int acpi_battery_print_info(struct seq_file *seq, int result)
530 {
531 struct acpi_battery *battery = seq->private;
532
533 if (result)
534 goto end;
535
536 seq_printf(seq, "present: %s\n",
537 acpi_battery_present(battery)?"yes":"no");
538 if (!acpi_battery_present(battery))
539 goto end;
540 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
541 seq_printf(seq, "design capacity: unknown\n");
542 else
543 seq_printf(seq, "design capacity: %d %sh\n",
544 battery->design_capacity,
545 acpi_battery_units(battery));
546
547 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
548 seq_printf(seq, "last full capacity: unknown\n");
549 else
550 seq_printf(seq, "last full capacity: %d %sh\n",
551 battery->full_charge_capacity,
552 acpi_battery_units(battery));
553
554 seq_printf(seq, "battery technology: %srechargeable\n",
555 (!battery->technology)?"non-":"");
556
557 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
558 seq_printf(seq, "design voltage: unknown\n");
559 else
560 seq_printf(seq, "design voltage: %d mV\n",
561 battery->design_voltage);
562 seq_printf(seq, "design capacity warning: %d %sh\n",
563 battery->design_capacity_warning,
564 acpi_battery_units(battery));
565 seq_printf(seq, "design capacity low: %d %sh\n",
566 battery->design_capacity_low,
567 acpi_battery_units(battery));
568 seq_printf(seq, "capacity granularity 1: %d %sh\n",
569 battery->capacity_granularity_1,
570 acpi_battery_units(battery));
571 seq_printf(seq, "capacity granularity 2: %d %sh\n",
572 battery->capacity_granularity_2,
573 acpi_battery_units(battery));
574 seq_printf(seq, "model number: %s\n", battery->model_number);
575 seq_printf(seq, "serial number: %s\n", battery->serial_number);
576 seq_printf(seq, "battery type: %s\n", battery->type);
577 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
578 end:
579 if (result)
580 seq_printf(seq, "ERROR: Unable to read battery info\n");
581 return result;
582 }
583
584 static int acpi_battery_print_state(struct seq_file *seq, int result)
585 {
586 struct acpi_battery *battery = seq->private;
587
588 if (result)
589 goto end;
590
591 seq_printf(seq, "present: %s\n",
592 acpi_battery_present(battery)?"yes":"no");
593 if (!acpi_battery_present(battery))
594 goto end;
595
596 seq_printf(seq, "capacity state: %s\n",
597 (battery->state & 0x04)?"critical":"ok");
598 if ((battery->state & 0x01) && (battery->state & 0x02))
599 seq_printf(seq,
600 "charging state: charging/discharging\n");
601 else if (battery->state & 0x01)
602 seq_printf(seq, "charging state: discharging\n");
603 else if (battery->state & 0x02)
604 seq_printf(seq, "charging state: charging\n");
605 else
606 seq_printf(seq, "charging state: charged\n");
607
608 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
609 seq_printf(seq, "present rate: unknown\n");
610 else
611 seq_printf(seq, "present rate: %d %s\n",
612 battery->current_now, acpi_battery_units(battery));
613
614 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
615 seq_printf(seq, "remaining capacity: unknown\n");
616 else
617 seq_printf(seq, "remaining capacity: %d %sh\n",
618 battery->capacity_now, acpi_battery_units(battery));
619 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
620 seq_printf(seq, "present voltage: unknown\n");
621 else
622 seq_printf(seq, "present voltage: %d mV\n",
623 battery->voltage_now);
624 end:
625 if (result)
626 seq_printf(seq, "ERROR: Unable to read battery state\n");
627
628 return result;
629 }
630
631 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
632 {
633 struct acpi_battery *battery = seq->private;
634
635 if (result)
636 goto end;
637
638 if (!acpi_battery_present(battery)) {
639 seq_printf(seq, "present: no\n");
640 goto end;
641 }
642 seq_printf(seq, "alarm: ");
643 if (!battery->alarm)
644 seq_printf(seq, "unsupported\n");
645 else
646 seq_printf(seq, "%u %sh\n", battery->alarm,
647 acpi_battery_units(battery));
648 end:
649 if (result)
650 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
651 return result;
652 }
653
654 static ssize_t acpi_battery_write_alarm(struct file *file,
655 const char __user * buffer,
656 size_t count, loff_t * ppos)
657 {
658 int result = 0;
659 char alarm_string[12] = { '\0' };
660 struct seq_file *m = file->private_data;
661 struct acpi_battery *battery = m->private;
662
663 if (!battery || (count > sizeof(alarm_string) - 1))
664 return -EINVAL;
665 if (!acpi_battery_present(battery)) {
666 result = -ENODEV;
667 goto end;
668 }
669 if (copy_from_user(alarm_string, buffer, count)) {
670 result = -EFAULT;
671 goto end;
672 }
673 alarm_string[count] = '\0';
674 battery->alarm = simple_strtol(alarm_string, NULL, 0);
675 result = acpi_battery_set_alarm(battery);
676 end:
677 if (!result)
678 return count;
679 return result;
680 }
681
682 typedef int(*print_func)(struct seq_file *seq, int result);
683
684 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
685 acpi_battery_print_info,
686 acpi_battery_print_state,
687 acpi_battery_print_alarm,
688 };
689
690 static int acpi_battery_read(int fid, struct seq_file *seq)
691 {
692 struct acpi_battery *battery = seq->private;
693 int result = acpi_battery_update(battery);
694 return acpi_print_funcs[fid](seq, result);
695 }
696
697 #define DECLARE_FILE_FUNCTIONS(_name) \
698 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
699 { \
700 return acpi_battery_read(_name##_tag, seq); \
701 } \
702 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
703 { \
704 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
705 }
706
707 DECLARE_FILE_FUNCTIONS(info);
708 DECLARE_FILE_FUNCTIONS(state);
709 DECLARE_FILE_FUNCTIONS(alarm);
710
711 #undef DECLARE_FILE_FUNCTIONS
712
713 #define FILE_DESCRIPTION_RO(_name) \
714 { \
715 .name = __stringify(_name), \
716 .mode = S_IRUGO, \
717 .ops = { \
718 .open = acpi_battery_##_name##_open_fs, \
719 .read = seq_read, \
720 .llseek = seq_lseek, \
721 .release = single_release, \
722 .owner = THIS_MODULE, \
723 }, \
724 }
725
726 #define FILE_DESCRIPTION_RW(_name) \
727 { \
728 .name = __stringify(_name), \
729 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
730 .ops = { \
731 .open = acpi_battery_##_name##_open_fs, \
732 .read = seq_read, \
733 .llseek = seq_lseek, \
734 .write = acpi_battery_write_##_name, \
735 .release = single_release, \
736 .owner = THIS_MODULE, \
737 }, \
738 }
739
740 static struct battery_file {
741 struct file_operations ops;
742 mode_t mode;
743 char *name;
744 } acpi_battery_file[] = {
745 FILE_DESCRIPTION_RO(info),
746 FILE_DESCRIPTION_RO(state),
747 FILE_DESCRIPTION_RW(alarm),
748 };
749
750 #undef FILE_DESCRIPTION_RO
751 #undef FILE_DESCRIPTION_RW
752
753 static int acpi_battery_add_fs(struct acpi_device *device)
754 {
755 struct proc_dir_entry *entry = NULL;
756 int i;
757
758 if (!acpi_device_dir(device)) {
759 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
760 acpi_battery_dir);
761 if (!acpi_device_dir(device))
762 return -ENODEV;
763 acpi_device_dir(device)->owner = THIS_MODULE;
764 }
765
766 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
767 entry = proc_create_data(acpi_battery_file[i].name,
768 acpi_battery_file[i].mode,
769 acpi_device_dir(device),
770 &acpi_battery_file[i].ops,
771 acpi_driver_data(device));
772 if (!entry)
773 return -ENODEV;
774 }
775 return 0;
776 }
777
778 static void acpi_battery_remove_fs(struct acpi_device *device)
779 {
780 int i;
781 if (!acpi_device_dir(device))
782 return;
783 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
784 remove_proc_entry(acpi_battery_file[i].name,
785 acpi_device_dir(device));
786
787 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
788 acpi_device_dir(device) = NULL;
789 }
790
791 #endif
792
793 /* --------------------------------------------------------------------------
794 Driver Interface
795 -------------------------------------------------------------------------- */
796
797 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
798 {
799 struct acpi_battery *battery = data;
800 struct acpi_device *device;
801 if (!battery)
802 return;
803 device = battery->device;
804 acpi_battery_update(battery);
805 acpi_bus_generate_proc_event(device, event,
806 acpi_battery_present(battery));
807 acpi_bus_generate_netlink_event(device->pnp.device_class,
808 dev_name(&device->dev), event,
809 acpi_battery_present(battery));
810 #ifdef CONFIG_ACPI_SYSFS_POWER
811 /* acpi_batter_update could remove power_supply object */
812 if (battery->bat.dev)
813 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
814 #endif
815 }
816
817 static int acpi_battery_add(struct acpi_device *device)
818 {
819 int result = 0;
820 acpi_status status = 0;
821 struct acpi_battery *battery = NULL;
822 if (!device)
823 return -EINVAL;
824 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
825 if (!battery)
826 return -ENOMEM;
827 battery->device = device;
828 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
829 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
830 device->driver_data = battery;
831 mutex_init(&battery->lock);
832 acpi_battery_update(battery);
833 #ifdef CONFIG_ACPI_PROCFS_POWER
834 result = acpi_battery_add_fs(device);
835 if (result)
836 goto end;
837 #endif
838 status = acpi_install_notify_handler(device->handle,
839 ACPI_ALL_NOTIFY,
840 acpi_battery_notify, battery);
841 if (ACPI_FAILURE(status)) {
842 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
843 result = -ENODEV;
844 goto end;
845 }
846 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
847 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
848 device->status.battery_present ? "present" : "absent");
849 end:
850 if (result) {
851 #ifdef CONFIG_ACPI_PROCFS_POWER
852 acpi_battery_remove_fs(device);
853 #endif
854 kfree(battery);
855 }
856 return result;
857 }
858
859 static int acpi_battery_remove(struct acpi_device *device, int type)
860 {
861 acpi_status status = 0;
862 struct acpi_battery *battery = NULL;
863
864 if (!device || !acpi_driver_data(device))
865 return -EINVAL;
866 battery = acpi_driver_data(device);
867 status = acpi_remove_notify_handler(device->handle,
868 ACPI_ALL_NOTIFY,
869 acpi_battery_notify);
870 #ifdef CONFIG_ACPI_PROCFS_POWER
871 acpi_battery_remove_fs(device);
872 #endif
873 #ifdef CONFIG_ACPI_SYSFS_POWER
874 sysfs_remove_battery(battery);
875 #endif
876 mutex_destroy(&battery->lock);
877 kfree(battery);
878 return 0;
879 }
880
881 /* this is needed to learn about changes made in suspended state */
882 static int acpi_battery_resume(struct acpi_device *device)
883 {
884 struct acpi_battery *battery;
885 if (!device)
886 return -EINVAL;
887 battery = acpi_driver_data(device);
888 battery->update_time = 0;
889 acpi_battery_update(battery);
890 return 0;
891 }
892
893 static struct acpi_driver acpi_battery_driver = {
894 .name = "battery",
895 .class = ACPI_BATTERY_CLASS,
896 .ids = battery_device_ids,
897 .ops = {
898 .add = acpi_battery_add,
899 .resume = acpi_battery_resume,
900 .remove = acpi_battery_remove,
901 },
902 };
903
904 static int __init acpi_battery_init(void)
905 {
906 if (acpi_disabled)
907 return -ENODEV;
908 #ifdef CONFIG_ACPI_PROCFS_POWER
909 acpi_battery_dir = acpi_lock_battery_dir();
910 if (!acpi_battery_dir)
911 return -ENODEV;
912 #endif
913 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
914 #ifdef CONFIG_ACPI_PROCFS_POWER
915 acpi_unlock_battery_dir(acpi_battery_dir);
916 #endif
917 return -ENODEV;
918 }
919 return 0;
920 }
921
922 static void __exit acpi_battery_exit(void)
923 {
924 acpi_bus_unregister_driver(&acpi_battery_driver);
925 #ifdef CONFIG_ACPI_PROCFS_POWER
926 acpi_unlock_battery_dir(acpi_battery_dir);
927 #endif
928 }
929
930 module_init(acpi_battery_init);
931 module_exit(acpi_battery_exit);
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