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V4L/DVB (12948): v4l1-compat: fix VIDIOC_G_STD handling
[linux/fpc-iii.git] / drivers / acpi / battery.c
blob58b4517ce71277b2d7c533d0cc43b0052a58f975
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 rate_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 case POWER_SUPPLY_PROP_POWER_NOW:
201 val->intval = battery->rate_now * 1000;
202 break;
203 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
204 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
205 val->intval = battery->design_capacity * 1000;
206 break;
207 case POWER_SUPPLY_PROP_CHARGE_FULL:
208 case POWER_SUPPLY_PROP_ENERGY_FULL:
209 val->intval = battery->full_charge_capacity * 1000;
210 break;
211 case POWER_SUPPLY_PROP_CHARGE_NOW:
212 case POWER_SUPPLY_PROP_ENERGY_NOW:
213 val->intval = battery->capacity_now * 1000;
214 break;
215 case POWER_SUPPLY_PROP_MODEL_NAME:
216 val->strval = battery->model_number;
217 break;
218 case POWER_SUPPLY_PROP_MANUFACTURER:
219 val->strval = battery->oem_info;
220 break;
221 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
222 val->strval = battery->serial_number;
223 break;
224 default:
225 return -EINVAL;
226 }
227 return 0;
228 }
229
230 static enum power_supply_property charge_battery_props[] = {
231 POWER_SUPPLY_PROP_STATUS,
232 POWER_SUPPLY_PROP_PRESENT,
233 POWER_SUPPLY_PROP_TECHNOLOGY,
234 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
235 POWER_SUPPLY_PROP_VOLTAGE_NOW,
236 POWER_SUPPLY_PROP_CURRENT_NOW,
237 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
238 POWER_SUPPLY_PROP_CHARGE_FULL,
239 POWER_SUPPLY_PROP_CHARGE_NOW,
240 POWER_SUPPLY_PROP_MODEL_NAME,
241 POWER_SUPPLY_PROP_MANUFACTURER,
242 POWER_SUPPLY_PROP_SERIAL_NUMBER,
243 };
244
245 static enum power_supply_property energy_battery_props[] = {
246 POWER_SUPPLY_PROP_STATUS,
247 POWER_SUPPLY_PROP_PRESENT,
248 POWER_SUPPLY_PROP_TECHNOLOGY,
249 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
250 POWER_SUPPLY_PROP_VOLTAGE_NOW,
251 POWER_SUPPLY_PROP_CURRENT_NOW,
252 POWER_SUPPLY_PROP_POWER_NOW,
253 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
254 POWER_SUPPLY_PROP_ENERGY_FULL,
255 POWER_SUPPLY_PROP_ENERGY_NOW,
256 POWER_SUPPLY_PROP_MODEL_NAME,
257 POWER_SUPPLY_PROP_MANUFACTURER,
258 POWER_SUPPLY_PROP_SERIAL_NUMBER,
259 };
260 #endif
261
262 #ifdef CONFIG_ACPI_PROCFS_POWER
263 inline char *acpi_battery_units(struct acpi_battery *battery)
264 {
265 return (battery->power_unit)?"mA":"mW";
266 }
267 #endif
268
269 /* --------------------------------------------------------------------------
270 Battery Management
271 -------------------------------------------------------------------------- */
272 struct acpi_offsets {
273 size_t offset; /* offset inside struct acpi_sbs_battery */
274 u8 mode; /* int or string? */
275 };
276
277 static struct acpi_offsets state_offsets[] = {
278 {offsetof(struct acpi_battery, state), 0},
279 {offsetof(struct acpi_battery, rate_now), 0},
280 {offsetof(struct acpi_battery, capacity_now), 0},
281 {offsetof(struct acpi_battery, voltage_now), 0},
282 };
283
284 static struct acpi_offsets info_offsets[] = {
285 {offsetof(struct acpi_battery, power_unit), 0},
286 {offsetof(struct acpi_battery, design_capacity), 0},
287 {offsetof(struct acpi_battery, full_charge_capacity), 0},
288 {offsetof(struct acpi_battery, technology), 0},
289 {offsetof(struct acpi_battery, design_voltage), 0},
290 {offsetof(struct acpi_battery, design_capacity_warning), 0},
291 {offsetof(struct acpi_battery, design_capacity_low), 0},
292 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
293 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
294 {offsetof(struct acpi_battery, model_number), 1},
295 {offsetof(struct acpi_battery, serial_number), 1},
296 {offsetof(struct acpi_battery, type), 1},
297 {offsetof(struct acpi_battery, oem_info), 1},
298 };
299
300 static int extract_package(struct acpi_battery *battery,
301 union acpi_object *package,
302 struct acpi_offsets *offsets, int num)
303 {
304 int i;
305 union acpi_object *element;
306 if (package->type != ACPI_TYPE_PACKAGE)
307 return -EFAULT;
308 for (i = 0; i < num; ++i) {
309 if (package->package.count <= i)
310 return -EFAULT;
311 element = &package->package.elements[i];
312 if (offsets[i].mode) {
313 u8 *ptr = (u8 *)battery + offsets[i].offset;
314 if (element->type == ACPI_TYPE_STRING ||
315 element->type == ACPI_TYPE_BUFFER)
316 strncpy(ptr, element->string.pointer, 32);
317 else if (element->type == ACPI_TYPE_INTEGER) {
318 strncpy(ptr, (u8 *)&element->integer.value,
319 sizeof(acpi_integer));
320 ptr[sizeof(acpi_integer)] = 0;
321 } else
322 *ptr = 0; /* don't have value */
323 } else {
324 int *x = (int *)((u8 *)battery + offsets[i].offset);
325 *x = (element->type == ACPI_TYPE_INTEGER) ?
326 element->integer.value : -1;
327 }
328 }
329 return 0;
330 }
331
332 static int acpi_battery_get_status(struct acpi_battery *battery)
333 {
334 if (acpi_bus_get_status(battery->device)) {
335 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
336 return -ENODEV;
337 }
338 return 0;
339 }
340
341 static int acpi_battery_get_info(struct acpi_battery *battery)
342 {
343 int result = -EFAULT;
344 acpi_status status = 0;
345 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
346
347 if (!acpi_battery_present(battery))
348 return 0;
349 mutex_lock(&battery->lock);
350 status = acpi_evaluate_object(battery->device->handle, "_BIF",
351 NULL, &buffer);
352 mutex_unlock(&battery->lock);
353
354 if (ACPI_FAILURE(status)) {
355 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
356 return -ENODEV;
357 }
358
359 result = extract_package(battery, buffer.pointer,
360 info_offsets, ARRAY_SIZE(info_offsets));
361 kfree(buffer.pointer);
362 return result;
363 }
364
365 static int acpi_battery_get_state(struct acpi_battery *battery)
366 {
367 int result = 0;
368 acpi_status status = 0;
369 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
370
371 if (!acpi_battery_present(battery))
372 return 0;
373
374 if (battery->update_time &&
375 time_before(jiffies, battery->update_time +
376 msecs_to_jiffies(cache_time)))
377 return 0;
378
379 mutex_lock(&battery->lock);
380 status = acpi_evaluate_object(battery->device->handle, "_BST",
381 NULL, &buffer);
382 mutex_unlock(&battery->lock);
383
384 if (ACPI_FAILURE(status)) {
385 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
386 return -ENODEV;
387 }
388
389 result = extract_package(battery, buffer.pointer,
390 state_offsets, ARRAY_SIZE(state_offsets));
391 battery->update_time = jiffies;
392 kfree(buffer.pointer);
393 return result;
394 }
395
396 static int acpi_battery_set_alarm(struct acpi_battery *battery)
397 {
398 acpi_status status = 0;
399 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
400 struct acpi_object_list arg_list = { 1, &arg0 };
401
402 if (!acpi_battery_present(battery)|| !battery->alarm_present)
403 return -ENODEV;
404
405 arg0.integer.value = battery->alarm;
406
407 mutex_lock(&battery->lock);
408 status = acpi_evaluate_object(battery->device->handle, "_BTP",
409 &arg_list, NULL);
410 mutex_unlock(&battery->lock);
411
412 if (ACPI_FAILURE(status))
413 return -ENODEV;
414
415 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
416 return 0;
417 }
418
419 static int acpi_battery_init_alarm(struct acpi_battery *battery)
420 {
421 acpi_status status = AE_OK;
422 acpi_handle handle = NULL;
423
424 /* See if alarms are supported, and if so, set default */
425 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
426 if (ACPI_FAILURE(status)) {
427 battery->alarm_present = 0;
428 return 0;
429 }
430 battery->alarm_present = 1;
431 if (!battery->alarm)
432 battery->alarm = battery->design_capacity_warning;
433 return acpi_battery_set_alarm(battery);
434 }
435
436 #ifdef CONFIG_ACPI_SYSFS_POWER
437 static ssize_t acpi_battery_alarm_show(struct device *dev,
438 struct device_attribute *attr,
439 char *buf)
440 {
441 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
442 return sprintf(buf, "%d\n", battery->alarm * 1000);
443 }
444
445 static ssize_t acpi_battery_alarm_store(struct device *dev,
446 struct device_attribute *attr,
447 const char *buf, size_t count)
448 {
449 unsigned long x;
450 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
451 if (sscanf(buf, "%ld\n", &x) == 1)
452 battery->alarm = x/1000;
453 if (acpi_battery_present(battery))
454 acpi_battery_set_alarm(battery);
455 return count;
456 }
457
458 static struct device_attribute alarm_attr = {
459 .attr = {.name = "alarm", .mode = 0644},
460 .show = acpi_battery_alarm_show,
461 .store = acpi_battery_alarm_store,
462 };
463
464 static int sysfs_add_battery(struct acpi_battery *battery)
465 {
466 int result;
467
468 if (battery->power_unit) {
469 battery->bat.properties = charge_battery_props;
470 battery->bat.num_properties =
471 ARRAY_SIZE(charge_battery_props);
472 } else {
473 battery->bat.properties = energy_battery_props;
474 battery->bat.num_properties =
475 ARRAY_SIZE(energy_battery_props);
476 }
477
478 battery->bat.name = acpi_device_bid(battery->device);
479 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
480 battery->bat.get_property = acpi_battery_get_property;
481
482 result = power_supply_register(&battery->device->dev, &battery->bat);
483 if (result)
484 return result;
485 return device_create_file(battery->bat.dev, &alarm_attr);
486 }
487
488 static void sysfs_remove_battery(struct acpi_battery *battery)
489 {
490 if (!battery->bat.dev)
491 return;
492 device_remove_file(battery->bat.dev, &alarm_attr);
493 power_supply_unregister(&battery->bat);
494 battery->bat.dev = NULL;
495 }
496 #endif
497
498 static int acpi_battery_update(struct acpi_battery *battery)
499 {
500 int result, old_present = acpi_battery_present(battery);
501 result = acpi_battery_get_status(battery);
502 if (result)
503 return result;
504 #ifdef CONFIG_ACPI_SYSFS_POWER
505 if (!acpi_battery_present(battery)) {
506 sysfs_remove_battery(battery);
507 battery->update_time = 0;
508 return 0;
509 }
510 #endif
511 if (!battery->update_time ||
512 old_present != acpi_battery_present(battery)) {
513 result = acpi_battery_get_info(battery);
514 if (result)
515 return result;
516 acpi_battery_init_alarm(battery);
517 }
518 #ifdef CONFIG_ACPI_SYSFS_POWER
519 if (!battery->bat.dev)
520 sysfs_add_battery(battery);
521 #endif
522 return acpi_battery_get_state(battery);
523 }
524
525 /* --------------------------------------------------------------------------
526 FS Interface (/proc)
527 -------------------------------------------------------------------------- */
528
529 #ifdef CONFIG_ACPI_PROCFS_POWER
530 static struct proc_dir_entry *acpi_battery_dir;
531
532 static int acpi_battery_print_info(struct seq_file *seq, int result)
533 {
534 struct acpi_battery *battery = seq->private;
535
536 if (result)
537 goto end;
538
539 seq_printf(seq, "present: %s\n",
540 acpi_battery_present(battery)?"yes":"no");
541 if (!acpi_battery_present(battery))
542 goto end;
543 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
544 seq_printf(seq, "design capacity: unknown\n");
545 else
546 seq_printf(seq, "design capacity: %d %sh\n",
547 battery->design_capacity,
548 acpi_battery_units(battery));
549
550 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
551 seq_printf(seq, "last full capacity: unknown\n");
552 else
553 seq_printf(seq, "last full capacity: %d %sh\n",
554 battery->full_charge_capacity,
555 acpi_battery_units(battery));
556
557 seq_printf(seq, "battery technology: %srechargeable\n",
558 (!battery->technology)?"non-":"");
559
560 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
561 seq_printf(seq, "design voltage: unknown\n");
562 else
563 seq_printf(seq, "design voltage: %d mV\n",
564 battery->design_voltage);
565 seq_printf(seq, "design capacity warning: %d %sh\n",
566 battery->design_capacity_warning,
567 acpi_battery_units(battery));
568 seq_printf(seq, "design capacity low: %d %sh\n",
569 battery->design_capacity_low,
570 acpi_battery_units(battery));
571 seq_printf(seq, "capacity granularity 1: %d %sh\n",
572 battery->capacity_granularity_1,
573 acpi_battery_units(battery));
574 seq_printf(seq, "capacity granularity 2: %d %sh\n",
575 battery->capacity_granularity_2,
576 acpi_battery_units(battery));
577 seq_printf(seq, "model number: %s\n", battery->model_number);
578 seq_printf(seq, "serial number: %s\n", battery->serial_number);
579 seq_printf(seq, "battery type: %s\n", battery->type);
580 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
581 end:
582 if (result)
583 seq_printf(seq, "ERROR: Unable to read battery info\n");
584 return result;
585 }
586
587 static int acpi_battery_print_state(struct seq_file *seq, int result)
588 {
589 struct acpi_battery *battery = seq->private;
590
591 if (result)
592 goto end;
593
594 seq_printf(seq, "present: %s\n",
595 acpi_battery_present(battery)?"yes":"no");
596 if (!acpi_battery_present(battery))
597 goto end;
598
599 seq_printf(seq, "capacity state: %s\n",
600 (battery->state & 0x04)?"critical":"ok");
601 if ((battery->state & 0x01) && (battery->state & 0x02))
602 seq_printf(seq,
603 "charging state: charging/discharging\n");
604 else if (battery->state & 0x01)
605 seq_printf(seq, "charging state: discharging\n");
606 else if (battery->state & 0x02)
607 seq_printf(seq, "charging state: charging\n");
608 else
609 seq_printf(seq, "charging state: charged\n");
610
611 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
612 seq_printf(seq, "present rate: unknown\n");
613 else
614 seq_printf(seq, "present rate: %d %s\n",
615 battery->rate_now, acpi_battery_units(battery));
616
617 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
618 seq_printf(seq, "remaining capacity: unknown\n");
619 else
620 seq_printf(seq, "remaining capacity: %d %sh\n",
621 battery->capacity_now, acpi_battery_units(battery));
622 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
623 seq_printf(seq, "present voltage: unknown\n");
624 else
625 seq_printf(seq, "present voltage: %d mV\n",
626 battery->voltage_now);
627 end:
628 if (result)
629 seq_printf(seq, "ERROR: Unable to read battery state\n");
630
631 return result;
632 }
633
634 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
635 {
636 struct acpi_battery *battery = seq->private;
637
638 if (result)
639 goto end;
640
641 if (!acpi_battery_present(battery)) {
642 seq_printf(seq, "present: no\n");
643 goto end;
644 }
645 seq_printf(seq, "alarm: ");
646 if (!battery->alarm)
647 seq_printf(seq, "unsupported\n");
648 else
649 seq_printf(seq, "%u %sh\n", battery->alarm,
650 acpi_battery_units(battery));
651 end:
652 if (result)
653 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
654 return result;
655 }
656
657 static ssize_t acpi_battery_write_alarm(struct file *file,
658 const char __user * buffer,
659 size_t count, loff_t * ppos)
660 {
661 int result = 0;
662 char alarm_string[12] = { '\0' };
663 struct seq_file *m = file->private_data;
664 struct acpi_battery *battery = m->private;
665
666 if (!battery || (count > sizeof(alarm_string) - 1))
667 return -EINVAL;
668 if (!acpi_battery_present(battery)) {
669 result = -ENODEV;
670 goto end;
671 }
672 if (copy_from_user(alarm_string, buffer, count)) {
673 result = -EFAULT;
674 goto end;
675 }
676 alarm_string[count] = '\0';
677 battery->alarm = simple_strtol(alarm_string, NULL, 0);
678 result = acpi_battery_set_alarm(battery);
679 end:
680 if (!result)
681 return count;
682 return result;
683 }
684
685 typedef int(*print_func)(struct seq_file *seq, int result);
686
687 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
688 acpi_battery_print_info,
689 acpi_battery_print_state,
690 acpi_battery_print_alarm,
691 };
692
693 static int acpi_battery_read(int fid, struct seq_file *seq)
694 {
695 struct acpi_battery *battery = seq->private;
696 int result = acpi_battery_update(battery);
697 return acpi_print_funcs[fid](seq, result);
698 }
699
700 #define DECLARE_FILE_FUNCTIONS(_name) \
701 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
702 { \
703 return acpi_battery_read(_name##_tag, seq); \
704 } \
705 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
706 { \
707 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
708 }
709
710 DECLARE_FILE_FUNCTIONS(info);
711 DECLARE_FILE_FUNCTIONS(state);
712 DECLARE_FILE_FUNCTIONS(alarm);
713
714 #undef DECLARE_FILE_FUNCTIONS
715
716 #define FILE_DESCRIPTION_RO(_name) \
717 { \
718 .name = __stringify(_name), \
719 .mode = S_IRUGO, \
720 .ops = { \
721 .open = acpi_battery_##_name##_open_fs, \
722 .read = seq_read, \
723 .llseek = seq_lseek, \
724 .release = single_release, \
725 .owner = THIS_MODULE, \
726 }, \
727 }
728
729 #define FILE_DESCRIPTION_RW(_name) \
730 { \
731 .name = __stringify(_name), \
732 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
733 .ops = { \
734 .open = acpi_battery_##_name##_open_fs, \
735 .read = seq_read, \
736 .llseek = seq_lseek, \
737 .write = acpi_battery_write_##_name, \
738 .release = single_release, \
739 .owner = THIS_MODULE, \
740 }, \
741 }
742
743 static struct battery_file {
744 struct file_operations ops;
745 mode_t mode;
746 const char *name;
747 } acpi_battery_file[] = {
748 FILE_DESCRIPTION_RO(info),
749 FILE_DESCRIPTION_RO(state),
750 FILE_DESCRIPTION_RW(alarm),
751 };
752
753 #undef FILE_DESCRIPTION_RO
754 #undef FILE_DESCRIPTION_RW
755
756 static int acpi_battery_add_fs(struct acpi_device *device)
757 {
758 struct proc_dir_entry *entry = NULL;
759 int i;
760
761 if (!acpi_device_dir(device)) {
762 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
763 acpi_battery_dir);
764 if (!acpi_device_dir(device))
765 return -ENODEV;
766 }
767
768 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
769 entry = proc_create_data(acpi_battery_file[i].name,
770 acpi_battery_file[i].mode,
771 acpi_device_dir(device),
772 &acpi_battery_file[i].ops,
773 acpi_driver_data(device));
774 if (!entry)
775 return -ENODEV;
776 }
777 return 0;
778 }
779
780 static void acpi_battery_remove_fs(struct acpi_device *device)
781 {
782 int i;
783 if (!acpi_device_dir(device))
784 return;
785 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
786 remove_proc_entry(acpi_battery_file[i].name,
787 acpi_device_dir(device));
788
789 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
790 acpi_device_dir(device) = NULL;
791 }
792
793 #endif
794
795 /* --------------------------------------------------------------------------
796 Driver Interface
797 -------------------------------------------------------------------------- */
798
799 static void acpi_battery_notify(struct acpi_device *device, u32 event)
800 {
801 struct acpi_battery *battery = acpi_driver_data(device);
802
803 if (!battery)
804 return;
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 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 #endif
836 if (!result) {
837 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
838 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
839 device->status.battery_present ? "present" : "absent");
840 } else {
841 #ifdef CONFIG_ACPI_PROCFS_POWER
842 acpi_battery_remove_fs(device);
843 #endif
844 kfree(battery);
845 }
846 return result;
847 }
848
849 static int acpi_battery_remove(struct acpi_device *device, int type)
850 {
851 struct acpi_battery *battery = NULL;
852
853 if (!device || !acpi_driver_data(device))
854 return -EINVAL;
855 battery = acpi_driver_data(device);
856 #ifdef CONFIG_ACPI_PROCFS_POWER
857 acpi_battery_remove_fs(device);
858 #endif
859 #ifdef CONFIG_ACPI_SYSFS_POWER
860 sysfs_remove_battery(battery);
861 #endif
862 mutex_destroy(&battery->lock);
863 kfree(battery);
864 return 0;
865 }
866
867 /* this is needed to learn about changes made in suspended state */
868 static int acpi_battery_resume(struct acpi_device *device)
869 {
870 struct acpi_battery *battery;
871 if (!device)
872 return -EINVAL;
873 battery = acpi_driver_data(device);
874 battery->update_time = 0;
875 acpi_battery_update(battery);
876 return 0;
877 }
878
879 static struct acpi_driver acpi_battery_driver = {
880 .name = "battery",
881 .class = ACPI_BATTERY_CLASS,
882 .ids = battery_device_ids,
883 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
884 .ops = {
885 .add = acpi_battery_add,
886 .resume = acpi_battery_resume,
887 .remove = acpi_battery_remove,
888 .notify = acpi_battery_notify,
889 },
890 };
891
892 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
893 {
894 if (acpi_disabled)
895 return;
896 #ifdef CONFIG_ACPI_PROCFS_POWER
897 acpi_battery_dir = acpi_lock_battery_dir();
898 if (!acpi_battery_dir)
899 return;
900 #endif
901 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
902 #ifdef CONFIG_ACPI_PROCFS_POWER
903 acpi_unlock_battery_dir(acpi_battery_dir);
904 #endif
905 return;
906 }
907 return;
908 }
909
910 static int __init acpi_battery_init(void)
911 {
912 async_schedule(acpi_battery_init_async, NULL);
913 return 0;
914 }
915
916 static void __exit acpi_battery_exit(void)
917 {
918 acpi_bus_unregister_driver(&acpi_battery_driver);
919 #ifdef CONFIG_ACPI_PROCFS_POWER
920 acpi_unlock_battery_dir(acpi_battery_dir);
921 #endif
922 }
923
924 module_init(acpi_battery_init);
925 module_exit(acpi_battery_exit);
Linux with added FPC-III support