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ACPI: battery: asynchronous init
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / acpi / battery.c
blob0f1c8190c1d31ac90af7ce810795794214d44ab4
1 /*
2 * battery.c - ACPI Battery Driver (Revision: 2.0)
3 *
4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 *
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 */
27
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/types.h>
32 #include <linux/jiffies.h>
33 #include <linux/async.h>
34
35 #ifdef CONFIG_ACPI_PROCFS_POWER
36 #include <linux/proc_fs.h>
37 #include <linux/seq_file.h>
38 #include <asm/uaccess.h>
39 #endif
40
41 #include <acpi/acpi_bus.h>
42 #include <acpi/acpi_drivers.h>
43
44 #ifdef CONFIG_ACPI_SYSFS_POWER
45 #include <linux/power_supply.h>
46 #endif
47
48 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
49
50 #define ACPI_BATTERY_CLASS "battery"
51 #define ACPI_BATTERY_DEVICE_NAME "Battery"
52 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
53 #define ACPI_BATTERY_NOTIFY_INFO 0x81
54
55 #define _COMPONENT ACPI_BATTERY_COMPONENT
56
57 ACPI_MODULE_NAME("battery");
58
59 MODULE_AUTHOR("Paul Diefenbaugh");
60 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
61 MODULE_DESCRIPTION("ACPI Battery Driver");
62 MODULE_LICENSE("GPL");
63
64 static unsigned int cache_time = 1000;
65 module_param(cache_time, uint, 0644);
66 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
67
68 #ifdef CONFIG_ACPI_PROCFS_POWER
69 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
70 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
71
72 enum acpi_battery_files {
73 info_tag = 0,
74 state_tag,
75 alarm_tag,
76 ACPI_BATTERY_NUMFILES,
77 };
78
79 #endif
80
81 static const struct acpi_device_id battery_device_ids[] = {
82 {"PNP0C0A", 0},
83 {"", 0},
84 };
85
86 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
87
88
89 struct acpi_battery {
90 struct mutex lock;
91 #ifdef CONFIG_ACPI_SYSFS_POWER
92 struct power_supply bat;
93 #endif
94 struct acpi_device *device;
95 unsigned long update_time;
96 int current_now;
97 int capacity_now;
98 int voltage_now;
99 int design_capacity;
100 int full_charge_capacity;
101 int technology;
102 int design_voltage;
103 int design_capacity_warning;
104 int design_capacity_low;
105 int capacity_granularity_1;
106 int capacity_granularity_2;
107 int alarm;
108 char model_number[32];
109 char serial_number[32];
110 char type[32];
111 char oem_info[32];
112 int state;
113 int power_unit;
114 u8 alarm_present;
115 };
116
117 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
118
119 inline int acpi_battery_present(struct acpi_battery *battery)
120 {
121 return battery->device->status.battery_present;
122 }
123
124 #ifdef CONFIG_ACPI_SYSFS_POWER
125 static int acpi_battery_technology(struct acpi_battery *battery)
126 {
127 if (!strcasecmp("NiCd", battery->type))
128 return POWER_SUPPLY_TECHNOLOGY_NiCd;
129 if (!strcasecmp("NiMH", battery->type))
130 return POWER_SUPPLY_TECHNOLOGY_NiMH;
131 if (!strcasecmp("LION", battery->type))
132 return POWER_SUPPLY_TECHNOLOGY_LION;
133 if (!strncasecmp("LI-ION", battery->type, 6))
134 return POWER_SUPPLY_TECHNOLOGY_LION;
135 if (!strcasecmp("LiP", battery->type))
136 return POWER_SUPPLY_TECHNOLOGY_LIPO;
137 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
138 }
139
140 static int acpi_battery_get_state(struct acpi_battery *battery);
141
142 static int acpi_battery_is_charged(struct acpi_battery *battery)
143 {
144 /* either charging or discharging */
145 if (battery->state != 0)
146 return 0;
147
148 /* battery not reporting charge */
149 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
150 battery->capacity_now == 0)
151 return 0;
152
153 /* good batteries update full_charge as the batteries degrade */
154 if (battery->full_charge_capacity == battery->capacity_now)
155 return 1;
156
157 /* fallback to using design values for broken batteries */
158 if (battery->design_capacity == battery->capacity_now)
159 return 1;
160
161 /* we don't do any sort of metric based on percentages */
162 return 0;
163 }
164
165 static int acpi_battery_get_property(struct power_supply *psy,
166 enum power_supply_property psp,
167 union power_supply_propval *val)
168 {
169 struct acpi_battery *battery = to_acpi_battery(psy);
170
171 if (acpi_battery_present(battery)) {
172 /* run battery update only if it is present */
173 acpi_battery_get_state(battery);
174 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
175 return -ENODEV;
176 switch (psp) {
177 case POWER_SUPPLY_PROP_STATUS:
178 if (battery->state & 0x01)
179 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
180 else if (battery->state & 0x02)
181 val->intval = POWER_SUPPLY_STATUS_CHARGING;
182 else if (acpi_battery_is_charged(battery))
183 val->intval = POWER_SUPPLY_STATUS_FULL;
184 else
185 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
186 break;
187 case POWER_SUPPLY_PROP_PRESENT:
188 val->intval = acpi_battery_present(battery);
189 break;
190 case POWER_SUPPLY_PROP_TECHNOLOGY:
191 val->intval = acpi_battery_technology(battery);
192 break;
193 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
194 val->intval = battery->design_voltage * 1000;
195 break;
196 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
197 val->intval = battery->voltage_now * 1000;
198 break;
199 case POWER_SUPPLY_PROP_CURRENT_NOW:
200 val->intval = battery->current_now * 1000;
201 break;
202 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
203 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
204 val->intval = battery->design_capacity * 1000;
205 break;
206 case POWER_SUPPLY_PROP_CHARGE_FULL:
207 case POWER_SUPPLY_PROP_ENERGY_FULL:
208 val->intval = battery->full_charge_capacity * 1000;
209 break;
210 case POWER_SUPPLY_PROP_CHARGE_NOW:
211 case POWER_SUPPLY_PROP_ENERGY_NOW:
212 val->intval = battery->capacity_now * 1000;
213 break;
214 case POWER_SUPPLY_PROP_MODEL_NAME:
215 val->strval = battery->model_number;
216 break;
217 case POWER_SUPPLY_PROP_MANUFACTURER:
218 val->strval = battery->oem_info;
219 break;
220 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
221 val->strval = battery->serial_number;
222 break;
223 default:
224 return -EINVAL;
225 }
226 return 0;
227 }
228
229 static enum power_supply_property charge_battery_props[] = {
230 POWER_SUPPLY_PROP_STATUS,
231 POWER_SUPPLY_PROP_PRESENT,
232 POWER_SUPPLY_PROP_TECHNOLOGY,
233 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
234 POWER_SUPPLY_PROP_VOLTAGE_NOW,
235 POWER_SUPPLY_PROP_CURRENT_NOW,
236 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
237 POWER_SUPPLY_PROP_CHARGE_FULL,
238 POWER_SUPPLY_PROP_CHARGE_NOW,
239 POWER_SUPPLY_PROP_MODEL_NAME,
240 POWER_SUPPLY_PROP_MANUFACTURER,
241 POWER_SUPPLY_PROP_SERIAL_NUMBER,
242 };
243
244 static enum power_supply_property energy_battery_props[] = {
245 POWER_SUPPLY_PROP_STATUS,
246 POWER_SUPPLY_PROP_PRESENT,
247 POWER_SUPPLY_PROP_TECHNOLOGY,
248 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
249 POWER_SUPPLY_PROP_VOLTAGE_NOW,
250 POWER_SUPPLY_PROP_CURRENT_NOW,
251 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
252 POWER_SUPPLY_PROP_ENERGY_FULL,
253 POWER_SUPPLY_PROP_ENERGY_NOW,
254 POWER_SUPPLY_PROP_MODEL_NAME,
255 POWER_SUPPLY_PROP_MANUFACTURER,
256 POWER_SUPPLY_PROP_SERIAL_NUMBER,
257 };
258 #endif
259
260 #ifdef CONFIG_ACPI_PROCFS_POWER
261 inline char *acpi_battery_units(struct acpi_battery *battery)
262 {
263 return (battery->power_unit)?"mA":"mW";
264 }
265 #endif
266
267 /* --------------------------------------------------------------------------
268 Battery Management
269 -------------------------------------------------------------------------- */
270 struct acpi_offsets {
271 size_t offset; /* offset inside struct acpi_sbs_battery */
272 u8 mode; /* int or string? */
273 };
274
275 static struct acpi_offsets state_offsets[] = {
276 {offsetof(struct acpi_battery, state), 0},
277 {offsetof(struct acpi_battery, current_now), 0},
278 {offsetof(struct acpi_battery, capacity_now), 0},
279 {offsetof(struct acpi_battery, voltage_now), 0},
280 };
281
282 static struct acpi_offsets info_offsets[] = {
283 {offsetof(struct acpi_battery, power_unit), 0},
284 {offsetof(struct acpi_battery, design_capacity), 0},
285 {offsetof(struct acpi_battery, full_charge_capacity), 0},
286 {offsetof(struct acpi_battery, technology), 0},
287 {offsetof(struct acpi_battery, design_voltage), 0},
288 {offsetof(struct acpi_battery, design_capacity_warning), 0},
289 {offsetof(struct acpi_battery, design_capacity_low), 0},
290 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
291 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
292 {offsetof(struct acpi_battery, model_number), 1},
293 {offsetof(struct acpi_battery, serial_number), 1},
294 {offsetof(struct acpi_battery, type), 1},
295 {offsetof(struct acpi_battery, oem_info), 1},
296 };
297
298 static int extract_package(struct acpi_battery *battery,
299 union acpi_object *package,
300 struct acpi_offsets *offsets, int num)
301 {
302 int i;
303 union acpi_object *element;
304 if (package->type != ACPI_TYPE_PACKAGE)
305 return -EFAULT;
306 for (i = 0; i < num; ++i) {
307 if (package->package.count <= i)
308 return -EFAULT;
309 element = &package->package.elements[i];
310 if (offsets[i].mode) {
311 u8 *ptr = (u8 *)battery + offsets[i].offset;
312 if (element->type == ACPI_TYPE_STRING ||
313 element->type == ACPI_TYPE_BUFFER)
314 strncpy(ptr, element->string.pointer, 32);
315 else if (element->type == ACPI_TYPE_INTEGER) {
316 strncpy(ptr, (u8 *)&element->integer.value,
317 sizeof(acpi_integer));
318 ptr[sizeof(acpi_integer)] = 0;
319 } else
320 *ptr = 0; /* don't have value */
321 } else {
322 int *x = (int *)((u8 *)battery + offsets[i].offset);
323 *x = (element->type == ACPI_TYPE_INTEGER) ?
324 element->integer.value : -1;
325 }
326 }
327 return 0;
328 }
329
330 static int acpi_battery_get_status(struct acpi_battery *battery)
331 {
332 if (acpi_bus_get_status(battery->device)) {
333 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
334 return -ENODEV;
335 }
336 return 0;
337 }
338
339 static int acpi_battery_get_info(struct acpi_battery *battery)
340 {
341 int result = -EFAULT;
342 acpi_status status = 0;
343 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
344
345 if (!acpi_battery_present(battery))
346 return 0;
347 mutex_lock(&battery->lock);
348 status = acpi_evaluate_object(battery->device->handle, "_BIF",
349 NULL, &buffer);
350 mutex_unlock(&battery->lock);
351
352 if (ACPI_FAILURE(status)) {
353 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
354 return -ENODEV;
355 }
356
357 result = extract_package(battery, buffer.pointer,
358 info_offsets, ARRAY_SIZE(info_offsets));
359 kfree(buffer.pointer);
360 return result;
361 }
362
363 static int acpi_battery_get_state(struct acpi_battery *battery)
364 {
365 int result = 0;
366 acpi_status status = 0;
367 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
368
369 if (!acpi_battery_present(battery))
370 return 0;
371
372 if (battery->update_time &&
373 time_before(jiffies, battery->update_time +
374 msecs_to_jiffies(cache_time)))
375 return 0;
376
377 mutex_lock(&battery->lock);
378 status = acpi_evaluate_object(battery->device->handle, "_BST",
379 NULL, &buffer);
380 mutex_unlock(&battery->lock);
381
382 if (ACPI_FAILURE(status)) {
383 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
384 return -ENODEV;
385 }
386
387 result = extract_package(battery, buffer.pointer,
388 state_offsets, ARRAY_SIZE(state_offsets));
389 battery->update_time = jiffies;
390 kfree(buffer.pointer);
391 return result;
392 }
393
394 static int acpi_battery_set_alarm(struct acpi_battery *battery)
395 {
396 acpi_status status = 0;
397 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
398 struct acpi_object_list arg_list = { 1, &arg0 };
399
400 if (!acpi_battery_present(battery)|| !battery->alarm_present)
401 return -ENODEV;
402
403 arg0.integer.value = battery->alarm;
404
405 mutex_lock(&battery->lock);
406 status = acpi_evaluate_object(battery->device->handle, "_BTP",
407 &arg_list, NULL);
408 mutex_unlock(&battery->lock);
409
410 if (ACPI_FAILURE(status))
411 return -ENODEV;
412
413 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
414 return 0;
415 }
416
417 static int acpi_battery_init_alarm(struct acpi_battery *battery)
418 {
419 acpi_status status = AE_OK;
420 acpi_handle handle = NULL;
421
422 /* See if alarms are supported, and if so, set default */
423 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
424 if (ACPI_FAILURE(status)) {
425 battery->alarm_present = 0;
426 return 0;
427 }
428 battery->alarm_present = 1;
429 if (!battery->alarm)
430 battery->alarm = battery->design_capacity_warning;
431 return acpi_battery_set_alarm(battery);
432 }
433
434 #ifdef CONFIG_ACPI_SYSFS_POWER
435 static ssize_t acpi_battery_alarm_show(struct device *dev,
436 struct device_attribute *attr,
437 char *buf)
438 {
439 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
440 return sprintf(buf, "%d\n", battery->alarm * 1000);
441 }
442
443 static ssize_t acpi_battery_alarm_store(struct device *dev,
444 struct device_attribute *attr,
445 const char *buf, size_t count)
446 {
447 unsigned long x;
448 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
449 if (sscanf(buf, "%ld\n", &x) == 1)
450 battery->alarm = x/1000;
451 if (acpi_battery_present(battery))
452 acpi_battery_set_alarm(battery);
453 return count;
454 }
455
456 static struct device_attribute alarm_attr = {
457 .attr = {.name = "alarm", .mode = 0644},
458 .show = acpi_battery_alarm_show,
459 .store = acpi_battery_alarm_store,
460 };
461
462 static int sysfs_add_battery(struct acpi_battery *battery)
463 {
464 int result;
465
466 if (battery->power_unit) {
467 battery->bat.properties = charge_battery_props;
468 battery->bat.num_properties =
469 ARRAY_SIZE(charge_battery_props);
470 } else {
471 battery->bat.properties = energy_battery_props;
472 battery->bat.num_properties =
473 ARRAY_SIZE(energy_battery_props);
474 }
475
476 battery->bat.name = acpi_device_bid(battery->device);
477 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
478 battery->bat.get_property = acpi_battery_get_property;
479
480 result = power_supply_register(&battery->device->dev, &battery->bat);
481 if (result)
482 return result;
483 return device_create_file(battery->bat.dev, &alarm_attr);
484 }
485
486 static void sysfs_remove_battery(struct acpi_battery *battery)
487 {
488 if (!battery->bat.dev)
489 return;
490 device_remove_file(battery->bat.dev, &alarm_attr);
491 power_supply_unregister(&battery->bat);
492 battery->bat.dev = NULL;
493 }
494 #endif
495
496 static int acpi_battery_update(struct acpi_battery *battery)
497 {
498 int result, old_present = acpi_battery_present(battery);
499 result = acpi_battery_get_status(battery);
500 if (result)
501 return result;
502 #ifdef CONFIG_ACPI_SYSFS_POWER
503 if (!acpi_battery_present(battery)) {
504 sysfs_remove_battery(battery);
505 battery->update_time = 0;
506 return 0;
507 }
508 #endif
509 if (!battery->update_time ||
510 old_present != acpi_battery_present(battery)) {
511 result = acpi_battery_get_info(battery);
512 if (result)
513 return result;
514 acpi_battery_init_alarm(battery);
515 }
516 #ifdef CONFIG_ACPI_SYSFS_POWER
517 if (!battery->bat.dev)
518 sysfs_add_battery(battery);
519 #endif
520 return acpi_battery_get_state(battery);
521 }
522
523 /* --------------------------------------------------------------------------
524 FS Interface (/proc)
525 -------------------------------------------------------------------------- */
526
527 #ifdef CONFIG_ACPI_PROCFS_POWER
528 static struct proc_dir_entry *acpi_battery_dir;
529
530 static int acpi_battery_print_info(struct seq_file *seq, int result)
531 {
532 struct acpi_battery *battery = seq->private;
533
534 if (result)
535 goto end;
536
537 seq_printf(seq, "present: %s\n",
538 acpi_battery_present(battery)?"yes":"no");
539 if (!acpi_battery_present(battery))
540 goto end;
541 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
542 seq_printf(seq, "design capacity: unknown\n");
543 else
544 seq_printf(seq, "design capacity: %d %sh\n",
545 battery->design_capacity,
546 acpi_battery_units(battery));
547
548 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
549 seq_printf(seq, "last full capacity: unknown\n");
550 else
551 seq_printf(seq, "last full capacity: %d %sh\n",
552 battery->full_charge_capacity,
553 acpi_battery_units(battery));
554
555 seq_printf(seq, "battery technology: %srechargeable\n",
556 (!battery->technology)?"non-":"");
557
558 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
559 seq_printf(seq, "design voltage: unknown\n");
560 else
561 seq_printf(seq, "design voltage: %d mV\n",
562 battery->design_voltage);
563 seq_printf(seq, "design capacity warning: %d %sh\n",
564 battery->design_capacity_warning,
565 acpi_battery_units(battery));
566 seq_printf(seq, "design capacity low: %d %sh\n",
567 battery->design_capacity_low,
568 acpi_battery_units(battery));
569 seq_printf(seq, "capacity granularity 1: %d %sh\n",
570 battery->capacity_granularity_1,
571 acpi_battery_units(battery));
572 seq_printf(seq, "capacity granularity 2: %d %sh\n",
573 battery->capacity_granularity_2,
574 acpi_battery_units(battery));
575 seq_printf(seq, "model number: %s\n", battery->model_number);
576 seq_printf(seq, "serial number: %s\n", battery->serial_number);
577 seq_printf(seq, "battery type: %s\n", battery->type);
578 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
579 end:
580 if (result)
581 seq_printf(seq, "ERROR: Unable to read battery info\n");
582 return result;
583 }
584
585 static int acpi_battery_print_state(struct seq_file *seq, int result)
586 {
587 struct acpi_battery *battery = seq->private;
588
589 if (result)
590 goto end;
591
592 seq_printf(seq, "present: %s\n",
593 acpi_battery_present(battery)?"yes":"no");
594 if (!acpi_battery_present(battery))
595 goto end;
596
597 seq_printf(seq, "capacity state: %s\n",
598 (battery->state & 0x04)?"critical":"ok");
599 if ((battery->state & 0x01) && (battery->state & 0x02))
600 seq_printf(seq,
601 "charging state: charging/discharging\n");
602 else if (battery->state & 0x01)
603 seq_printf(seq, "charging state: discharging\n");
604 else if (battery->state & 0x02)
605 seq_printf(seq, "charging state: charging\n");
606 else
607 seq_printf(seq, "charging state: charged\n");
608
609 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
610 seq_printf(seq, "present rate: unknown\n");
611 else
612 seq_printf(seq, "present rate: %d %s\n",
613 battery->current_now, acpi_battery_units(battery));
614
615 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
616 seq_printf(seq, "remaining capacity: unknown\n");
617 else
618 seq_printf(seq, "remaining capacity: %d %sh\n",
619 battery->capacity_now, acpi_battery_units(battery));
620 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
621 seq_printf(seq, "present voltage: unknown\n");
622 else
623 seq_printf(seq, "present voltage: %d mV\n",
624 battery->voltage_now);
625 end:
626 if (result)
627 seq_printf(seq, "ERROR: Unable to read battery state\n");
628
629 return result;
630 }
631
632 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
633 {
634 struct acpi_battery *battery = seq->private;
635
636 if (result)
637 goto end;
638
639 if (!acpi_battery_present(battery)) {
640 seq_printf(seq, "present: no\n");
641 goto end;
642 }
643 seq_printf(seq, "alarm: ");
644 if (!battery->alarm)
645 seq_printf(seq, "unsupported\n");
646 else
647 seq_printf(seq, "%u %sh\n", battery->alarm,
648 acpi_battery_units(battery));
649 end:
650 if (result)
651 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
652 return result;
653 }
654
655 static ssize_t acpi_battery_write_alarm(struct file *file,
656 const char __user * buffer,
657 size_t count, loff_t * ppos)
658 {
659 int result = 0;
660 char alarm_string[12] = { '\0' };
661 struct seq_file *m = file->private_data;
662 struct acpi_battery *battery = m->private;
663
664 if (!battery || (count > sizeof(alarm_string) - 1))
665 return -EINVAL;
666 if (!acpi_battery_present(battery)) {
667 result = -ENODEV;
668 goto end;
669 }
670 if (copy_from_user(alarm_string, buffer, count)) {
671 result = -EFAULT;
672 goto end;
673 }
674 alarm_string[count] = '\0';
675 battery->alarm = simple_strtol(alarm_string, NULL, 0);
676 result = acpi_battery_set_alarm(battery);
677 end:
678 if (!result)
679 return count;
680 return result;
681 }
682
683 typedef int(*print_func)(struct seq_file *seq, int result);
684
685 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
686 acpi_battery_print_info,
687 acpi_battery_print_state,
688 acpi_battery_print_alarm,
689 };
690
691 static int acpi_battery_read(int fid, struct seq_file *seq)
692 {
693 struct acpi_battery *battery = seq->private;
694 int result = acpi_battery_update(battery);
695 return acpi_print_funcs[fid](seq, result);
696 }
697
698 #define DECLARE_FILE_FUNCTIONS(_name) \
699 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
700 { \
701 return acpi_battery_read(_name##_tag, seq); \
702 } \
703 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
704 { \
705 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
706 }
707
708 DECLARE_FILE_FUNCTIONS(info);
709 DECLARE_FILE_FUNCTIONS(state);
710 DECLARE_FILE_FUNCTIONS(alarm);
711
712 #undef DECLARE_FILE_FUNCTIONS
713
714 #define FILE_DESCRIPTION_RO(_name) \
715 { \
716 .name = __stringify(_name), \
717 .mode = S_IRUGO, \
718 .ops = { \
719 .open = acpi_battery_##_name##_open_fs, \
720 .read = seq_read, \
721 .llseek = seq_lseek, \
722 .release = single_release, \
723 .owner = THIS_MODULE, \
724 }, \
725 }
726
727 #define FILE_DESCRIPTION_RW(_name) \
728 { \
729 .name = __stringify(_name), \
730 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
731 .ops = { \
732 .open = acpi_battery_##_name##_open_fs, \
733 .read = seq_read, \
734 .llseek = seq_lseek, \
735 .write = acpi_battery_write_##_name, \
736 .release = single_release, \
737 .owner = THIS_MODULE, \
738 }, \
739 }
740
741 static struct battery_file {
742 struct file_operations ops;
743 mode_t mode;
744 char *name;
745 } acpi_battery_file[] = {
746 FILE_DESCRIPTION_RO(info),
747 FILE_DESCRIPTION_RO(state),
748 FILE_DESCRIPTION_RW(alarm),
749 };
750
751 #undef FILE_DESCRIPTION_RO
752 #undef FILE_DESCRIPTION_RW
753
754 static int acpi_battery_add_fs(struct acpi_device *device)
755 {
756 struct proc_dir_entry *entry = NULL;
757 int i;
758
759 if (!acpi_device_dir(device)) {
760 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
761 acpi_battery_dir);
762 if (!acpi_device_dir(device))
763 return -ENODEV;
764 acpi_device_dir(device)->owner = THIS_MODULE;
765 }
766
767 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
768 entry = proc_create_data(acpi_battery_file[i].name,
769 acpi_battery_file[i].mode,
770 acpi_device_dir(device),
771 &acpi_battery_file[i].ops,
772 acpi_driver_data(device));
773 if (!entry)
774 return -ENODEV;
775 }
776 return 0;
777 }
778
779 static void acpi_battery_remove_fs(struct acpi_device *device)
780 {
781 int i;
782 if (!acpi_device_dir(device))
783 return;
784 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
785 remove_proc_entry(acpi_battery_file[i].name,
786 acpi_device_dir(device));
787
788 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
789 acpi_device_dir(device) = NULL;
790 }
791
792 #endif
793
794 /* --------------------------------------------------------------------------
795 Driver Interface
796 -------------------------------------------------------------------------- */
797
798 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
799 {
800 struct acpi_battery *battery = data;
801 struct acpi_device *device;
802 if (!battery)
803 return;
804 device = battery->device;
805 acpi_battery_update(battery);
806 acpi_bus_generate_proc_event(device, event,
807 acpi_battery_present(battery));
808 acpi_bus_generate_netlink_event(device->pnp.device_class,
809 dev_name(&device->dev), event,
810 acpi_battery_present(battery));
811 #ifdef CONFIG_ACPI_SYSFS_POWER
812 /* acpi_batter_update could remove power_supply object */
813 if (battery->bat.dev)
814 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
815 #endif
816 }
817
818 static int acpi_battery_add(struct acpi_device *device)
819 {
820 int result = 0;
821 acpi_status status = 0;
822 struct acpi_battery *battery = NULL;
823 if (!device)
824 return -EINVAL;
825 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
826 if (!battery)
827 return -ENOMEM;
828 battery->device = device;
829 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
830 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
831 device->driver_data = battery;
832 mutex_init(&battery->lock);
833 acpi_battery_update(battery);
834 #ifdef CONFIG_ACPI_PROCFS_POWER
835 result = acpi_battery_add_fs(device);
836 if (result)
837 goto end;
838 #endif
839 status = acpi_install_notify_handler(device->handle,
840 ACPI_ALL_NOTIFY,
841 acpi_battery_notify, battery);
842 if (ACPI_FAILURE(status)) {
843 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
844 result = -ENODEV;
845 goto end;
846 }
847 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
848 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
849 device->status.battery_present ? "present" : "absent");
850 end:
851 if (result) {
852 #ifdef CONFIG_ACPI_PROCFS_POWER
853 acpi_battery_remove_fs(device);
854 #endif
855 kfree(battery);
856 }
857 return result;
858 }
859
860 static int acpi_battery_remove(struct acpi_device *device, int type)
861 {
862 acpi_status status = 0;
863 struct acpi_battery *battery = NULL;
864
865 if (!device || !acpi_driver_data(device))
866 return -EINVAL;
867 battery = acpi_driver_data(device);
868 status = acpi_remove_notify_handler(device->handle,
869 ACPI_ALL_NOTIFY,
870 acpi_battery_notify);
871 #ifdef CONFIG_ACPI_PROCFS_POWER
872 acpi_battery_remove_fs(device);
873 #endif
874 #ifdef CONFIG_ACPI_SYSFS_POWER
875 sysfs_remove_battery(battery);
876 #endif
877 mutex_destroy(&battery->lock);
878 kfree(battery);
879 return 0;
880 }
881
882 /* this is needed to learn about changes made in suspended state */
883 static int acpi_battery_resume(struct acpi_device *device)
884 {
885 struct acpi_battery *battery;
886 if (!device)
887 return -EINVAL;
888 battery = acpi_driver_data(device);
889 battery->update_time = 0;
890 acpi_battery_update(battery);
891 return 0;
892 }
893
894 static struct acpi_driver acpi_battery_driver = {
895 .name = "battery",
896 .class = ACPI_BATTERY_CLASS,
897 .ids = battery_device_ids,
898 .ops = {
899 .add = acpi_battery_add,
900 .resume = acpi_battery_resume,
901 .remove = acpi_battery_remove,
902 },
903 };
904
905 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
906 {
907 if (acpi_disabled)
908 return;
909 #ifdef CONFIG_ACPI_PROCFS_POWER
910 acpi_battery_dir = acpi_lock_battery_dir();
911 if (!acpi_battery_dir)
912 return;
913 #endif
914 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
915 #ifdef CONFIG_ACPI_PROCFS_POWER
916 acpi_unlock_battery_dir(acpi_battery_dir);
917 #endif
918 return;
919 }
920 return;
921 }
922
923 static int __init acpi_battery_init(void)
924 {
925 async_schedule(acpi_battery_init_async, NULL);
926 return 0;
927 }
928
929 static void __exit acpi_battery_exit(void)
930 {
931 acpi_bus_unregister_driver(&acpi_battery_driver);
932 #ifdef CONFIG_ACPI_PROCFS_POWER
933 acpi_unlock_battery_dir(acpi_battery_dir);
934 #endif
935 }
936
937 module_init(acpi_battery_init);
938 module_exit(acpi_battery_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree