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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / acpi / battery.c
blob75f39f2c166d88b3b186a0bb2633fac77165753b
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 #include <linux/dmi.h>
35
36 #ifdef CONFIG_ACPI_PROCFS_POWER
37 #include <linux/proc_fs.h>
38 #include <linux/seq_file.h>
39 #include <asm/uaccess.h>
40 #endif
41
42 #include <acpi/acpi_bus.h>
43 #include <acpi/acpi_drivers.h>
44
45 #ifdef CONFIG_ACPI_SYSFS_POWER
46 #include <linux/power_supply.h>
47 #endif
48
49 #define PREFIX "ACPI: "
50
51 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
52
53 #define ACPI_BATTERY_CLASS "battery"
54 #define ACPI_BATTERY_DEVICE_NAME "Battery"
55 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
56 #define ACPI_BATTERY_NOTIFY_INFO 0x81
57 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
58
59 #define _COMPONENT ACPI_BATTERY_COMPONENT
60
61 ACPI_MODULE_NAME("battery");
62
63 MODULE_AUTHOR("Paul Diefenbaugh");
64 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
65 MODULE_DESCRIPTION("ACPI Battery Driver");
66 MODULE_LICENSE("GPL");
67
68 static unsigned int cache_time = 1000;
69 module_param(cache_time, uint, 0644);
70 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
71
72 #ifdef CONFIG_ACPI_PROCFS_POWER
73 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
74 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
75
76 enum acpi_battery_files {
77 info_tag = 0,
78 state_tag,
79 alarm_tag,
80 ACPI_BATTERY_NUMFILES,
81 };
82
83 #endif
84
85 static const struct acpi_device_id battery_device_ids[] = {
86 {"PNP0C0A", 0},
87 {"", 0},
88 };
89
90 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
91
92 enum {
93 ACPI_BATTERY_ALARM_PRESENT,
94 ACPI_BATTERY_XINFO_PRESENT,
95 /* For buggy DSDTs that report negative 16-bit values for either
96 * charging or discharging current and/or report 0 as 65536
97 * due to bad math.
98 */
99 ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
100 };
101
102 struct acpi_battery {
103 struct mutex lock;
104 #ifdef CONFIG_ACPI_SYSFS_POWER
105 struct power_supply bat;
106 #endif
107 struct acpi_device *device;
108 unsigned long update_time;
109 int rate_now;
110 int capacity_now;
111 int voltage_now;
112 int design_capacity;
113 int full_charge_capacity;
114 int technology;
115 int design_voltage;
116 int design_capacity_warning;
117 int design_capacity_low;
118 int cycle_count;
119 int measurement_accuracy;
120 int max_sampling_time;
121 int min_sampling_time;
122 int max_averaging_interval;
123 int min_averaging_interval;
124 int capacity_granularity_1;
125 int capacity_granularity_2;
126 int alarm;
127 char model_number[32];
128 char serial_number[32];
129 char type[32];
130 char oem_info[32];
131 int state;
132 int power_unit;
133 unsigned long flags;
134 };
135
136 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
137
138 inline int acpi_battery_present(struct acpi_battery *battery)
139 {
140 return battery->device->status.battery_present;
141 }
142
143 #ifdef CONFIG_ACPI_SYSFS_POWER
144 static int acpi_battery_technology(struct acpi_battery *battery)
145 {
146 if (!strcasecmp("NiCd", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_NiCd;
148 if (!strcasecmp("NiMH", battery->type))
149 return POWER_SUPPLY_TECHNOLOGY_NiMH;
150 if (!strcasecmp("LION", battery->type))
151 return POWER_SUPPLY_TECHNOLOGY_LION;
152 if (!strncasecmp("LI-ION", battery->type, 6))
153 return POWER_SUPPLY_TECHNOLOGY_LION;
154 if (!strcasecmp("LiP", battery->type))
155 return POWER_SUPPLY_TECHNOLOGY_LIPO;
156 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
157 }
158
159 static int acpi_battery_get_state(struct acpi_battery *battery);
160
161 static int acpi_battery_is_charged(struct acpi_battery *battery)
162 {
163 /* either charging or discharging */
164 if (battery->state != 0)
165 return 0;
166
167 /* battery not reporting charge */
168 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
169 battery->capacity_now == 0)
170 return 0;
171
172 /* good batteries update full_charge as the batteries degrade */
173 if (battery->full_charge_capacity == battery->capacity_now)
174 return 1;
175
176 /* fallback to using design values for broken batteries */
177 if (battery->design_capacity == battery->capacity_now)
178 return 1;
179
180 /* we don't do any sort of metric based on percentages */
181 return 0;
182 }
183
184 static int acpi_battery_get_property(struct power_supply *psy,
185 enum power_supply_property psp,
186 union power_supply_propval *val)
187 {
188 struct acpi_battery *battery = to_acpi_battery(psy);
189
190 if (acpi_battery_present(battery)) {
191 /* run battery update only if it is present */
192 acpi_battery_get_state(battery);
193 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
194 return -ENODEV;
195 switch (psp) {
196 case POWER_SUPPLY_PROP_STATUS:
197 if (battery->state & 0x01)
198 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
199 else if (battery->state & 0x02)
200 val->intval = POWER_SUPPLY_STATUS_CHARGING;
201 else if (acpi_battery_is_charged(battery))
202 val->intval = POWER_SUPPLY_STATUS_FULL;
203 else
204 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
205 break;
206 case POWER_SUPPLY_PROP_PRESENT:
207 val->intval = acpi_battery_present(battery);
208 break;
209 case POWER_SUPPLY_PROP_TECHNOLOGY:
210 val->intval = acpi_battery_technology(battery);
211 break;
212 case POWER_SUPPLY_PROP_CYCLE_COUNT:
213 val->intval = battery->cycle_count;
214 break;
215 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
216 val->intval = battery->design_voltage * 1000;
217 break;
218 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
219 val->intval = battery->voltage_now * 1000;
220 break;
221 case POWER_SUPPLY_PROP_CURRENT_NOW:
222 case POWER_SUPPLY_PROP_POWER_NOW:
223 val->intval = battery->rate_now * 1000;
224 break;
225 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
226 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
227 val->intval = battery->design_capacity * 1000;
228 break;
229 case POWER_SUPPLY_PROP_CHARGE_FULL:
230 case POWER_SUPPLY_PROP_ENERGY_FULL:
231 val->intval = battery->full_charge_capacity * 1000;
232 break;
233 case POWER_SUPPLY_PROP_CHARGE_NOW:
234 case POWER_SUPPLY_PROP_ENERGY_NOW:
235 val->intval = battery->capacity_now * 1000;
236 break;
237 case POWER_SUPPLY_PROP_MODEL_NAME:
238 val->strval = battery->model_number;
239 break;
240 case POWER_SUPPLY_PROP_MANUFACTURER:
241 val->strval = battery->oem_info;
242 break;
243 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
244 val->strval = battery->serial_number;
245 break;
246 default:
247 return -EINVAL;
248 }
249 return 0;
250 }
251
252 static enum power_supply_property charge_battery_props[] = {
253 POWER_SUPPLY_PROP_STATUS,
254 POWER_SUPPLY_PROP_PRESENT,
255 POWER_SUPPLY_PROP_TECHNOLOGY,
256 POWER_SUPPLY_PROP_CYCLE_COUNT,
257 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
258 POWER_SUPPLY_PROP_VOLTAGE_NOW,
259 POWER_SUPPLY_PROP_CURRENT_NOW,
260 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
261 POWER_SUPPLY_PROP_CHARGE_FULL,
262 POWER_SUPPLY_PROP_CHARGE_NOW,
263 POWER_SUPPLY_PROP_MODEL_NAME,
264 POWER_SUPPLY_PROP_MANUFACTURER,
265 POWER_SUPPLY_PROP_SERIAL_NUMBER,
266 };
267
268 static enum power_supply_property energy_battery_props[] = {
269 POWER_SUPPLY_PROP_STATUS,
270 POWER_SUPPLY_PROP_PRESENT,
271 POWER_SUPPLY_PROP_TECHNOLOGY,
272 POWER_SUPPLY_PROP_CYCLE_COUNT,
273 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
274 POWER_SUPPLY_PROP_VOLTAGE_NOW,
275 POWER_SUPPLY_PROP_CURRENT_NOW,
276 POWER_SUPPLY_PROP_POWER_NOW,
277 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
278 POWER_SUPPLY_PROP_ENERGY_FULL,
279 POWER_SUPPLY_PROP_ENERGY_NOW,
280 POWER_SUPPLY_PROP_MODEL_NAME,
281 POWER_SUPPLY_PROP_MANUFACTURER,
282 POWER_SUPPLY_PROP_SERIAL_NUMBER,
283 };
284 #endif
285
286 #ifdef CONFIG_ACPI_PROCFS_POWER
287 inline char *acpi_battery_units(struct acpi_battery *battery)
288 {
289 return (battery->power_unit)?"mA":"mW";
290 }
291 #endif
292
293 /* --------------------------------------------------------------------------
294 Battery Management
295 -------------------------------------------------------------------------- */
296 struct acpi_offsets {
297 size_t offset; /* offset inside struct acpi_sbs_battery */
298 u8 mode; /* int or string? */
299 };
300
301 static struct acpi_offsets state_offsets[] = {
302 {offsetof(struct acpi_battery, state), 0},
303 {offsetof(struct acpi_battery, rate_now), 0},
304 {offsetof(struct acpi_battery, capacity_now), 0},
305 {offsetof(struct acpi_battery, voltage_now), 0},
306 };
307
308 static struct acpi_offsets info_offsets[] = {
309 {offsetof(struct acpi_battery, power_unit), 0},
310 {offsetof(struct acpi_battery, design_capacity), 0},
311 {offsetof(struct acpi_battery, full_charge_capacity), 0},
312 {offsetof(struct acpi_battery, technology), 0},
313 {offsetof(struct acpi_battery, design_voltage), 0},
314 {offsetof(struct acpi_battery, design_capacity_warning), 0},
315 {offsetof(struct acpi_battery, design_capacity_low), 0},
316 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
317 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
318 {offsetof(struct acpi_battery, model_number), 1},
319 {offsetof(struct acpi_battery, serial_number), 1},
320 {offsetof(struct acpi_battery, type), 1},
321 {offsetof(struct acpi_battery, oem_info), 1},
322 };
323
324 static struct acpi_offsets extended_info_offsets[] = {
325 {offsetof(struct acpi_battery, power_unit), 0},
326 {offsetof(struct acpi_battery, design_capacity), 0},
327 {offsetof(struct acpi_battery, full_charge_capacity), 0},
328 {offsetof(struct acpi_battery, technology), 0},
329 {offsetof(struct acpi_battery, design_voltage), 0},
330 {offsetof(struct acpi_battery, design_capacity_warning), 0},
331 {offsetof(struct acpi_battery, design_capacity_low), 0},
332 {offsetof(struct acpi_battery, cycle_count), 0},
333 {offsetof(struct acpi_battery, measurement_accuracy), 0},
334 {offsetof(struct acpi_battery, max_sampling_time), 0},
335 {offsetof(struct acpi_battery, min_sampling_time), 0},
336 {offsetof(struct acpi_battery, max_averaging_interval), 0},
337 {offsetof(struct acpi_battery, min_averaging_interval), 0},
338 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
339 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
340 {offsetof(struct acpi_battery, model_number), 1},
341 {offsetof(struct acpi_battery, serial_number), 1},
342 {offsetof(struct acpi_battery, type), 1},
343 {offsetof(struct acpi_battery, oem_info), 1},
344 };
345
346 static int extract_package(struct acpi_battery *battery,
347 union acpi_object *package,
348 struct acpi_offsets *offsets, int num)
349 {
350 int i;
351 union acpi_object *element;
352 if (package->type != ACPI_TYPE_PACKAGE)
353 return -EFAULT;
354 for (i = 0; i < num; ++i) {
355 if (package->package.count <= i)
356 return -EFAULT;
357 element = &package->package.elements[i];
358 if (offsets[i].mode) {
359 u8 *ptr = (u8 *)battery + offsets[i].offset;
360 if (element->type == ACPI_TYPE_STRING ||
361 element->type == ACPI_TYPE_BUFFER)
362 strncpy(ptr, element->string.pointer, 32);
363 else if (element->type == ACPI_TYPE_INTEGER) {
364 strncpy(ptr, (u8 *)&element->integer.value,
365 sizeof(u64));
366 ptr[sizeof(u64)] = 0;
367 } else
368 *ptr = 0; /* don't have value */
369 } else {
370 int *x = (int *)((u8 *)battery + offsets[i].offset);
371 *x = (element->type == ACPI_TYPE_INTEGER) ?
372 element->integer.value : -1;
373 }
374 }
375 return 0;
376 }
377
378 static int acpi_battery_get_status(struct acpi_battery *battery)
379 {
380 if (acpi_bus_get_status(battery->device)) {
381 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
382 return -ENODEV;
383 }
384 return 0;
385 }
386
387 static int acpi_battery_get_info(struct acpi_battery *battery)
388 {
389 int result = -EFAULT;
390 acpi_status status = 0;
391 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
392 "_BIX" : "_BIF";
393
394 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
395
396 if (!acpi_battery_present(battery))
397 return 0;
398 mutex_lock(&battery->lock);
399 status = acpi_evaluate_object(battery->device->handle, name,
400 NULL, &buffer);
401 mutex_unlock(&battery->lock);
402
403 if (ACPI_FAILURE(status)) {
404 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
405 return -ENODEV;
406 }
407 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
408 result = extract_package(battery, buffer.pointer,
409 extended_info_offsets,
410 ARRAY_SIZE(extended_info_offsets));
411 else
412 result = extract_package(battery, buffer.pointer,
413 info_offsets, ARRAY_SIZE(info_offsets));
414 kfree(buffer.pointer);
415 return result;
416 }
417
418 static int acpi_battery_get_state(struct acpi_battery *battery)
419 {
420 int result = 0;
421 acpi_status status = 0;
422 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
423
424 if (!acpi_battery_present(battery))
425 return 0;
426
427 if (battery->update_time &&
428 time_before(jiffies, battery->update_time +
429 msecs_to_jiffies(cache_time)))
430 return 0;
431
432 mutex_lock(&battery->lock);
433 status = acpi_evaluate_object(battery->device->handle, "_BST",
434 NULL, &buffer);
435 mutex_unlock(&battery->lock);
436
437 if (ACPI_FAILURE(status)) {
438 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
439 return -ENODEV;
440 }
441
442 result = extract_package(battery, buffer.pointer,
443 state_offsets, ARRAY_SIZE(state_offsets));
444 battery->update_time = jiffies;
445 kfree(buffer.pointer);
446
447 if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
448 battery->rate_now != -1)
449 battery->rate_now = abs((s16)battery->rate_now);
450
451 return result;
452 }
453
454 static int acpi_battery_set_alarm(struct acpi_battery *battery)
455 {
456 acpi_status status = 0;
457 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
458 struct acpi_object_list arg_list = { 1, &arg0 };
459
460 if (!acpi_battery_present(battery) ||
461 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
462 return -ENODEV;
463
464 arg0.integer.value = battery->alarm;
465
466 mutex_lock(&battery->lock);
467 status = acpi_evaluate_object(battery->device->handle, "_BTP",
468 &arg_list, NULL);
469 mutex_unlock(&battery->lock);
470
471 if (ACPI_FAILURE(status))
472 return -ENODEV;
473
474 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
475 return 0;
476 }
477
478 static int acpi_battery_init_alarm(struct acpi_battery *battery)
479 {
480 acpi_status status = AE_OK;
481 acpi_handle handle = NULL;
482
483 /* See if alarms are supported, and if so, set default */
484 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
485 if (ACPI_FAILURE(status)) {
486 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
487 return 0;
488 }
489 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
490 if (!battery->alarm)
491 battery->alarm = battery->design_capacity_warning;
492 return acpi_battery_set_alarm(battery);
493 }
494
495 #ifdef CONFIG_ACPI_SYSFS_POWER
496 static ssize_t acpi_battery_alarm_show(struct device *dev,
497 struct device_attribute *attr,
498 char *buf)
499 {
500 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
501 return sprintf(buf, "%d\n", battery->alarm * 1000);
502 }
503
504 static ssize_t acpi_battery_alarm_store(struct device *dev,
505 struct device_attribute *attr,
506 const char *buf, size_t count)
507 {
508 unsigned long x;
509 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
510 if (sscanf(buf, "%ld\n", &x) == 1)
511 battery->alarm = x/1000;
512 if (acpi_battery_present(battery))
513 acpi_battery_set_alarm(battery);
514 return count;
515 }
516
517 static struct device_attribute alarm_attr = {
518 .attr = {.name = "alarm", .mode = 0644},
519 .show = acpi_battery_alarm_show,
520 .store = acpi_battery_alarm_store,
521 };
522
523 static int sysfs_add_battery(struct acpi_battery *battery)
524 {
525 int result;
526
527 if (battery->power_unit) {
528 battery->bat.properties = charge_battery_props;
529 battery->bat.num_properties =
530 ARRAY_SIZE(charge_battery_props);
531 } else {
532 battery->bat.properties = energy_battery_props;
533 battery->bat.num_properties =
534 ARRAY_SIZE(energy_battery_props);
535 }
536
537 battery->bat.name = acpi_device_bid(battery->device);
538 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
539 battery->bat.get_property = acpi_battery_get_property;
540
541 result = power_supply_register(&battery->device->dev, &battery->bat);
542 if (result)
543 return result;
544 return device_create_file(battery->bat.dev, &alarm_attr);
545 }
546
547 static void sysfs_remove_battery(struct acpi_battery *battery)
548 {
549 if (!battery->bat.dev)
550 return;
551 device_remove_file(battery->bat.dev, &alarm_attr);
552 power_supply_unregister(&battery->bat);
553 battery->bat.dev = NULL;
554 }
555 #endif
556
557 static void acpi_battery_quirks(struct acpi_battery *battery)
558 {
559 if (dmi_name_in_vendors("Acer") && battery->power_unit) {
560 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
561 }
562 }
563
564 static int acpi_battery_update(struct acpi_battery *battery)
565 {
566 int result, old_present = acpi_battery_present(battery);
567 result = acpi_battery_get_status(battery);
568 if (result)
569 return result;
570 #ifdef CONFIG_ACPI_SYSFS_POWER
571 if (!acpi_battery_present(battery)) {
572 sysfs_remove_battery(battery);
573 battery->update_time = 0;
574 return 0;
575 }
576 #endif
577 if (!battery->update_time ||
578 old_present != acpi_battery_present(battery)) {
579 result = acpi_battery_get_info(battery);
580 if (result)
581 return result;
582 acpi_battery_quirks(battery);
583 acpi_battery_init_alarm(battery);
584 }
585 #ifdef CONFIG_ACPI_SYSFS_POWER
586 if (!battery->bat.dev)
587 sysfs_add_battery(battery);
588 #endif
589 return acpi_battery_get_state(battery);
590 }
591
592 /* --------------------------------------------------------------------------
593 FS Interface (/proc)
594 -------------------------------------------------------------------------- */
595
596 #ifdef CONFIG_ACPI_PROCFS_POWER
597 static struct proc_dir_entry *acpi_battery_dir;
598
599 static int acpi_battery_print_info(struct seq_file *seq, int result)
600 {
601 struct acpi_battery *battery = seq->private;
602
603 if (result)
604 goto end;
605
606 seq_printf(seq, "present: %s\n",
607 acpi_battery_present(battery)?"yes":"no");
608 if (!acpi_battery_present(battery))
609 goto end;
610 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
611 seq_printf(seq, "design capacity: unknown\n");
612 else
613 seq_printf(seq, "design capacity: %d %sh\n",
614 battery->design_capacity,
615 acpi_battery_units(battery));
616
617 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
618 seq_printf(seq, "last full capacity: unknown\n");
619 else
620 seq_printf(seq, "last full capacity: %d %sh\n",
621 battery->full_charge_capacity,
622 acpi_battery_units(battery));
623
624 seq_printf(seq, "battery technology: %srechargeable\n",
625 (!battery->technology)?"non-":"");
626
627 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
628 seq_printf(seq, "design voltage: unknown\n");
629 else
630 seq_printf(seq, "design voltage: %d mV\n",
631 battery->design_voltage);
632 seq_printf(seq, "design capacity warning: %d %sh\n",
633 battery->design_capacity_warning,
634 acpi_battery_units(battery));
635 seq_printf(seq, "design capacity low: %d %sh\n",
636 battery->design_capacity_low,
637 acpi_battery_units(battery));
638 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
639 seq_printf(seq, "capacity granularity 1: %d %sh\n",
640 battery->capacity_granularity_1,
641 acpi_battery_units(battery));
642 seq_printf(seq, "capacity granularity 2: %d %sh\n",
643 battery->capacity_granularity_2,
644 acpi_battery_units(battery));
645 seq_printf(seq, "model number: %s\n", battery->model_number);
646 seq_printf(seq, "serial number: %s\n", battery->serial_number);
647 seq_printf(seq, "battery type: %s\n", battery->type);
648 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
649 end:
650 if (result)
651 seq_printf(seq, "ERROR: Unable to read battery info\n");
652 return result;
653 }
654
655 static int acpi_battery_print_state(struct seq_file *seq, int result)
656 {
657 struct acpi_battery *battery = seq->private;
658
659 if (result)
660 goto end;
661
662 seq_printf(seq, "present: %s\n",
663 acpi_battery_present(battery)?"yes":"no");
664 if (!acpi_battery_present(battery))
665 goto end;
666
667 seq_printf(seq, "capacity state: %s\n",
668 (battery->state & 0x04)?"critical":"ok");
669 if ((battery->state & 0x01) && (battery->state & 0x02))
670 seq_printf(seq,
671 "charging state: charging/discharging\n");
672 else if (battery->state & 0x01)
673 seq_printf(seq, "charging state: discharging\n");
674 else if (battery->state & 0x02)
675 seq_printf(seq, "charging state: charging\n");
676 else
677 seq_printf(seq, "charging state: charged\n");
678
679 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
680 seq_printf(seq, "present rate: unknown\n");
681 else
682 seq_printf(seq, "present rate: %d %s\n",
683 battery->rate_now, acpi_battery_units(battery));
684
685 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
686 seq_printf(seq, "remaining capacity: unknown\n");
687 else
688 seq_printf(seq, "remaining capacity: %d %sh\n",
689 battery->capacity_now, acpi_battery_units(battery));
690 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
691 seq_printf(seq, "present voltage: unknown\n");
692 else
693 seq_printf(seq, "present voltage: %d mV\n",
694 battery->voltage_now);
695 end:
696 if (result)
697 seq_printf(seq, "ERROR: Unable to read battery state\n");
698
699 return result;
700 }
701
702 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
703 {
704 struct acpi_battery *battery = seq->private;
705
706 if (result)
707 goto end;
708
709 if (!acpi_battery_present(battery)) {
710 seq_printf(seq, "present: no\n");
711 goto end;
712 }
713 seq_printf(seq, "alarm: ");
714 if (!battery->alarm)
715 seq_printf(seq, "unsupported\n");
716 else
717 seq_printf(seq, "%u %sh\n", battery->alarm,
718 acpi_battery_units(battery));
719 end:
720 if (result)
721 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
722 return result;
723 }
724
725 static ssize_t acpi_battery_write_alarm(struct file *file,
726 const char __user * buffer,
727 size_t count, loff_t * ppos)
728 {
729 int result = 0;
730 char alarm_string[12] = { '\0' };
731 struct seq_file *m = file->private_data;
732 struct acpi_battery *battery = m->private;
733
734 if (!battery || (count > sizeof(alarm_string) - 1))
735 return -EINVAL;
736 if (!acpi_battery_present(battery)) {
737 result = -ENODEV;
738 goto end;
739 }
740 if (copy_from_user(alarm_string, buffer, count)) {
741 result = -EFAULT;
742 goto end;
743 }
744 alarm_string[count] = '\0';
745 battery->alarm = simple_strtol(alarm_string, NULL, 0);
746 result = acpi_battery_set_alarm(battery);
747 end:
748 if (!result)
749 return count;
750 return result;
751 }
752
753 typedef int(*print_func)(struct seq_file *seq, int result);
754
755 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
756 acpi_battery_print_info,
757 acpi_battery_print_state,
758 acpi_battery_print_alarm,
759 };
760
761 static int acpi_battery_read(int fid, struct seq_file *seq)
762 {
763 struct acpi_battery *battery = seq->private;
764 int result = acpi_battery_update(battery);
765 return acpi_print_funcs[fid](seq, result);
766 }
767
768 #define DECLARE_FILE_FUNCTIONS(_name) \
769 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
770 { \
771 return acpi_battery_read(_name##_tag, seq); \
772 } \
773 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
774 { \
775 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
776 }
777
778 DECLARE_FILE_FUNCTIONS(info);
779 DECLARE_FILE_FUNCTIONS(state);
780 DECLARE_FILE_FUNCTIONS(alarm);
781
782 #undef DECLARE_FILE_FUNCTIONS
783
784 #define FILE_DESCRIPTION_RO(_name) \
785 { \
786 .name = __stringify(_name), \
787 .mode = S_IRUGO, \
788 .ops = { \
789 .open = acpi_battery_##_name##_open_fs, \
790 .read = seq_read, \
791 .llseek = seq_lseek, \
792 .release = single_release, \
793 .owner = THIS_MODULE, \
794 }, \
795 }
796
797 #define FILE_DESCRIPTION_RW(_name) \
798 { \
799 .name = __stringify(_name), \
800 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
801 .ops = { \
802 .open = acpi_battery_##_name##_open_fs, \
803 .read = seq_read, \
804 .llseek = seq_lseek, \
805 .write = acpi_battery_write_##_name, \
806 .release = single_release, \
807 .owner = THIS_MODULE, \
808 }, \
809 }
810
811 static struct battery_file {
812 struct file_operations ops;
813 mode_t mode;
814 const char *name;
815 } acpi_battery_file[] = {
816 FILE_DESCRIPTION_RO(info),
817 FILE_DESCRIPTION_RO(state),
818 FILE_DESCRIPTION_RW(alarm),
819 };
820
821 #undef FILE_DESCRIPTION_RO
822 #undef FILE_DESCRIPTION_RW
823
824 static int acpi_battery_add_fs(struct acpi_device *device)
825 {
826 struct proc_dir_entry *entry = NULL;
827 int i;
828
829 if (!acpi_device_dir(device)) {
830 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
831 acpi_battery_dir);
832 if (!acpi_device_dir(device))
833 return -ENODEV;
834 }
835
836 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
837 entry = proc_create_data(acpi_battery_file[i].name,
838 acpi_battery_file[i].mode,
839 acpi_device_dir(device),
840 &acpi_battery_file[i].ops,
841 acpi_driver_data(device));
842 if (!entry)
843 return -ENODEV;
844 }
845 return 0;
846 }
847
848 static void acpi_battery_remove_fs(struct acpi_device *device)
849 {
850 int i;
851 if (!acpi_device_dir(device))
852 return;
853 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
854 remove_proc_entry(acpi_battery_file[i].name,
855 acpi_device_dir(device));
856
857 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
858 acpi_device_dir(device) = NULL;
859 }
860
861 #endif
862
863 /* --------------------------------------------------------------------------
864 Driver Interface
865 -------------------------------------------------------------------------- */
866
867 static void acpi_battery_notify(struct acpi_device *device, u32 event)
868 {
869 struct acpi_battery *battery = acpi_driver_data(device);
870
871 if (!battery)
872 return;
873 acpi_battery_update(battery);
874 acpi_bus_generate_proc_event(device, event,
875 acpi_battery_present(battery));
876 acpi_bus_generate_netlink_event(device->pnp.device_class,
877 dev_name(&device->dev), event,
878 acpi_battery_present(battery));
879 #ifdef CONFIG_ACPI_SYSFS_POWER
880 /* acpi_battery_update could remove power_supply object */
881 if (battery->bat.dev)
882 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
883 #endif
884 }
885
886 static int acpi_battery_add(struct acpi_device *device)
887 {
888 int result = 0;
889 struct acpi_battery *battery = NULL;
890 acpi_handle handle;
891 if (!device)
892 return -EINVAL;
893 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
894 if (!battery)
895 return -ENOMEM;
896 battery->device = device;
897 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
898 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
899 device->driver_data = battery;
900 mutex_init(&battery->lock);
901 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
902 "_BIX", &handle)))
903 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
904 acpi_battery_update(battery);
905 #ifdef CONFIG_ACPI_PROCFS_POWER
906 result = acpi_battery_add_fs(device);
907 #endif
908 if (!result) {
909 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
910 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
911 device->status.battery_present ? "present" : "absent");
912 } else {
913 #ifdef CONFIG_ACPI_PROCFS_POWER
914 acpi_battery_remove_fs(device);
915 #endif
916 kfree(battery);
917 }
918 return result;
919 }
920
921 static int acpi_battery_remove(struct acpi_device *device, int type)
922 {
923 struct acpi_battery *battery = NULL;
924
925 if (!device || !acpi_driver_data(device))
926 return -EINVAL;
927 battery = acpi_driver_data(device);
928 #ifdef CONFIG_ACPI_PROCFS_POWER
929 acpi_battery_remove_fs(device);
930 #endif
931 #ifdef CONFIG_ACPI_SYSFS_POWER
932 sysfs_remove_battery(battery);
933 #endif
934 mutex_destroy(&battery->lock);
935 kfree(battery);
936 return 0;
937 }
938
939 /* this is needed to learn about changes made in suspended state */
940 static int acpi_battery_resume(struct acpi_device *device)
941 {
942 struct acpi_battery *battery;
943 if (!device)
944 return -EINVAL;
945 battery = acpi_driver_data(device);
946 battery->update_time = 0;
947 acpi_battery_update(battery);
948 return 0;
949 }
950
951 static struct acpi_driver acpi_battery_driver = {
952 .name = "battery",
953 .class = ACPI_BATTERY_CLASS,
954 .ids = battery_device_ids,
955 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
956 .ops = {
957 .add = acpi_battery_add,
958 .resume = acpi_battery_resume,
959 .remove = acpi_battery_remove,
960 .notify = acpi_battery_notify,
961 },
962 };
963
964 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
965 {
966 if (acpi_disabled)
967 return;
968 #ifdef CONFIG_ACPI_PROCFS_POWER
969 acpi_battery_dir = acpi_lock_battery_dir();
970 if (!acpi_battery_dir)
971 return;
972 #endif
973 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
974 #ifdef CONFIG_ACPI_PROCFS_POWER
975 acpi_unlock_battery_dir(acpi_battery_dir);
976 #endif
977 return;
978 }
979 return;
980 }
981
982 static int __init acpi_battery_init(void)
983 {
984 async_schedule(acpi_battery_init_async, NULL);
985 return 0;
986 }
987
988 static void __exit acpi_battery_exit(void)
989 {
990 acpi_bus_unregister_driver(&acpi_battery_driver);
991 #ifdef CONFIG_ACPI_PROCFS_POWER
992 acpi_unlock_battery_dir(acpi_battery_dir);
993 #endif
994 }
995
996 module_init(acpi_battery_init);
997 module_exit(acpi_battery_exit);