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ceph: strip misleading/obsolete version, feature info
[linux-2.6.git] / drivers / acpi / battery.c
blobdc58402b0a177a4e03e8dc54e7a094804edc1d36
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 #include <linux/slab.h>
36
37 #ifdef CONFIG_ACPI_PROCFS_POWER
38 #include <linux/proc_fs.h>
39 #include <linux/seq_file.h>
40 #include <asm/uaccess.h>
41 #endif
42
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
45
46 #ifdef CONFIG_ACPI_SYSFS_POWER
47 #include <linux/power_supply.h>
48 #endif
49
50 #define PREFIX "ACPI: "
51
52 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
53
54 #define ACPI_BATTERY_CLASS "battery"
55 #define ACPI_BATTERY_DEVICE_NAME "Battery"
56 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
57 #define ACPI_BATTERY_NOTIFY_INFO 0x81
58 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
59
60 #define _COMPONENT ACPI_BATTERY_COMPONENT
61
62 ACPI_MODULE_NAME("battery");
63
64 MODULE_AUTHOR("Paul Diefenbaugh");
65 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
66 MODULE_DESCRIPTION("ACPI Battery Driver");
67 MODULE_LICENSE("GPL");
68
69 static unsigned int cache_time = 1000;
70 module_param(cache_time, uint, 0644);
71 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
72
73 #ifdef CONFIG_ACPI_PROCFS_POWER
74 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
75 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
76
77 enum acpi_battery_files {
78 info_tag = 0,
79 state_tag,
80 alarm_tag,
81 ACPI_BATTERY_NUMFILES,
82 };
83
84 #endif
85
86 static const struct acpi_device_id battery_device_ids[] = {
87 {"PNP0C0A", 0},
88 {"", 0},
89 };
90
91 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
92
93 enum {
94 ACPI_BATTERY_ALARM_PRESENT,
95 ACPI_BATTERY_XINFO_PRESENT,
96 /* For buggy DSDTs that report negative 16-bit values for either
97 * charging or discharging current and/or report 0 as 65536
98 * due to bad math.
99 */
100 ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
101 };
102
103 struct acpi_battery {
104 struct mutex lock;
105 #ifdef CONFIG_ACPI_SYSFS_POWER
106 struct power_supply bat;
107 #endif
108 struct acpi_device *device;
109 unsigned long update_time;
110 int rate_now;
111 int capacity_now;
112 int voltage_now;
113 int design_capacity;
114 int full_charge_capacity;
115 int technology;
116 int design_voltage;
117 int design_capacity_warning;
118 int design_capacity_low;
119 int cycle_count;
120 int measurement_accuracy;
121 int max_sampling_time;
122 int min_sampling_time;
123 int max_averaging_interval;
124 int min_averaging_interval;
125 int capacity_granularity_1;
126 int capacity_granularity_2;
127 int alarm;
128 char model_number[32];
129 char serial_number[32];
130 char type[32];
131 char oem_info[32];
132 int state;
133 int power_unit;
134 unsigned long flags;
135 };
136
137 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
138
139 inline int acpi_battery_present(struct acpi_battery *battery)
140 {
141 return battery->device->status.battery_present;
142 }
143
144 #ifdef CONFIG_ACPI_SYSFS_POWER
145 static int acpi_battery_technology(struct acpi_battery *battery)
146 {
147 if (!strcasecmp("NiCd", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_NiCd;
149 if (!strcasecmp("NiMH", battery->type))
150 return POWER_SUPPLY_TECHNOLOGY_NiMH;
151 if (!strcasecmp("LION", battery->type))
152 return POWER_SUPPLY_TECHNOLOGY_LION;
153 if (!strncasecmp("LI-ION", battery->type, 6))
154 return POWER_SUPPLY_TECHNOLOGY_LION;
155 if (!strcasecmp("LiP", battery->type))
156 return POWER_SUPPLY_TECHNOLOGY_LIPO;
157 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
158 }
159
160 static int acpi_battery_get_state(struct acpi_battery *battery);
161
162 static int acpi_battery_is_charged(struct acpi_battery *battery)
163 {
164 /* either charging or discharging */
165 if (battery->state != 0)
166 return 0;
167
168 /* battery not reporting charge */
169 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
170 battery->capacity_now == 0)
171 return 0;
172
173 /* good batteries update full_charge as the batteries degrade */
174 if (battery->full_charge_capacity == battery->capacity_now)
175 return 1;
176
177 /* fallback to using design values for broken batteries */
178 if (battery->design_capacity == battery->capacity_now)
179 return 1;
180
181 /* we don't do any sort of metric based on percentages */
182 return 0;
183 }
184
185 static int acpi_battery_get_property(struct power_supply *psy,
186 enum power_supply_property psp,
187 union power_supply_propval *val)
188 {
189 struct acpi_battery *battery = to_acpi_battery(psy);
190
191 if (acpi_battery_present(battery)) {
192 /* run battery update only if it is present */
193 acpi_battery_get_state(battery);
194 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
195 return -ENODEV;
196 switch (psp) {
197 case POWER_SUPPLY_PROP_STATUS:
198 if (battery->state & 0x01)
199 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
200 else if (battery->state & 0x02)
201 val->intval = POWER_SUPPLY_STATUS_CHARGING;
202 else if (acpi_battery_is_charged(battery))
203 val->intval = POWER_SUPPLY_STATUS_FULL;
204 else
205 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
206 break;
207 case POWER_SUPPLY_PROP_PRESENT:
208 val->intval = acpi_battery_present(battery);
209 break;
210 case POWER_SUPPLY_PROP_TECHNOLOGY:
211 val->intval = acpi_battery_technology(battery);
212 break;
213 case POWER_SUPPLY_PROP_CYCLE_COUNT:
214 val->intval = battery->cycle_count;
215 break;
216 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
217 val->intval = battery->design_voltage * 1000;
218 break;
219 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
220 val->intval = battery->voltage_now * 1000;
221 break;
222 case POWER_SUPPLY_PROP_CURRENT_NOW:
223 case POWER_SUPPLY_PROP_POWER_NOW:
224 val->intval = battery->rate_now * 1000;
225 break;
226 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
227 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
228 val->intval = battery->design_capacity * 1000;
229 break;
230 case POWER_SUPPLY_PROP_CHARGE_FULL:
231 case POWER_SUPPLY_PROP_ENERGY_FULL:
232 val->intval = battery->full_charge_capacity * 1000;
233 break;
234 case POWER_SUPPLY_PROP_CHARGE_NOW:
235 case POWER_SUPPLY_PROP_ENERGY_NOW:
236 val->intval = battery->capacity_now * 1000;
237 break;
238 case POWER_SUPPLY_PROP_MODEL_NAME:
239 val->strval = battery->model_number;
240 break;
241 case POWER_SUPPLY_PROP_MANUFACTURER:
242 val->strval = battery->oem_info;
243 break;
244 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
245 val->strval = battery->serial_number;
246 break;
247 default:
248 return -EINVAL;
249 }
250 return 0;
251 }
252
253 static enum power_supply_property charge_battery_props[] = {
254 POWER_SUPPLY_PROP_STATUS,
255 POWER_SUPPLY_PROP_PRESENT,
256 POWER_SUPPLY_PROP_TECHNOLOGY,
257 POWER_SUPPLY_PROP_CYCLE_COUNT,
258 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
259 POWER_SUPPLY_PROP_VOLTAGE_NOW,
260 POWER_SUPPLY_PROP_CURRENT_NOW,
261 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
262 POWER_SUPPLY_PROP_CHARGE_FULL,
263 POWER_SUPPLY_PROP_CHARGE_NOW,
264 POWER_SUPPLY_PROP_MODEL_NAME,
265 POWER_SUPPLY_PROP_MANUFACTURER,
266 POWER_SUPPLY_PROP_SERIAL_NUMBER,
267 };
268
269 static enum power_supply_property energy_battery_props[] = {
270 POWER_SUPPLY_PROP_STATUS,
271 POWER_SUPPLY_PROP_PRESENT,
272 POWER_SUPPLY_PROP_TECHNOLOGY,
273 POWER_SUPPLY_PROP_CYCLE_COUNT,
274 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
275 POWER_SUPPLY_PROP_VOLTAGE_NOW,
276 POWER_SUPPLY_PROP_CURRENT_NOW,
277 POWER_SUPPLY_PROP_POWER_NOW,
278 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
279 POWER_SUPPLY_PROP_ENERGY_FULL,
280 POWER_SUPPLY_PROP_ENERGY_NOW,
281 POWER_SUPPLY_PROP_MODEL_NAME,
282 POWER_SUPPLY_PROP_MANUFACTURER,
283 POWER_SUPPLY_PROP_SERIAL_NUMBER,
284 };
285 #endif
286
287 #ifdef CONFIG_ACPI_PROCFS_POWER
288 inline char *acpi_battery_units(struct acpi_battery *battery)
289 {
290 return (battery->power_unit)?"mA":"mW";
291 }
292 #endif
293
294 /* --------------------------------------------------------------------------
295 Battery Management
296 -------------------------------------------------------------------------- */
297 struct acpi_offsets {
298 size_t offset; /* offset inside struct acpi_sbs_battery */
299 u8 mode; /* int or string? */
300 };
301
302 static struct acpi_offsets state_offsets[] = {
303 {offsetof(struct acpi_battery, state), 0},
304 {offsetof(struct acpi_battery, rate_now), 0},
305 {offsetof(struct acpi_battery, capacity_now), 0},
306 {offsetof(struct acpi_battery, voltage_now), 0},
307 };
308
309 static struct acpi_offsets info_offsets[] = {
310 {offsetof(struct acpi_battery, power_unit), 0},
311 {offsetof(struct acpi_battery, design_capacity), 0},
312 {offsetof(struct acpi_battery, full_charge_capacity), 0},
313 {offsetof(struct acpi_battery, technology), 0},
314 {offsetof(struct acpi_battery, design_voltage), 0},
315 {offsetof(struct acpi_battery, design_capacity_warning), 0},
316 {offsetof(struct acpi_battery, design_capacity_low), 0},
317 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
318 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
319 {offsetof(struct acpi_battery, model_number), 1},
320 {offsetof(struct acpi_battery, serial_number), 1},
321 {offsetof(struct acpi_battery, type), 1},
322 {offsetof(struct acpi_battery, oem_info), 1},
323 };
324
325 static struct acpi_offsets extended_info_offsets[] = {
326 {offsetof(struct acpi_battery, power_unit), 0},
327 {offsetof(struct acpi_battery, design_capacity), 0},
328 {offsetof(struct acpi_battery, full_charge_capacity), 0},
329 {offsetof(struct acpi_battery, technology), 0},
330 {offsetof(struct acpi_battery, design_voltage), 0},
331 {offsetof(struct acpi_battery, design_capacity_warning), 0},
332 {offsetof(struct acpi_battery, design_capacity_low), 0},
333 {offsetof(struct acpi_battery, cycle_count), 0},
334 {offsetof(struct acpi_battery, measurement_accuracy), 0},
335 {offsetof(struct acpi_battery, max_sampling_time), 0},
336 {offsetof(struct acpi_battery, min_sampling_time), 0},
337 {offsetof(struct acpi_battery, max_averaging_interval), 0},
338 {offsetof(struct acpi_battery, min_averaging_interval), 0},
339 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
340 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
341 {offsetof(struct acpi_battery, model_number), 1},
342 {offsetof(struct acpi_battery, serial_number), 1},
343 {offsetof(struct acpi_battery, type), 1},
344 {offsetof(struct acpi_battery, oem_info), 1},
345 };
346
347 static int extract_package(struct acpi_battery *battery,
348 union acpi_object *package,
349 struct acpi_offsets *offsets, int num)
350 {
351 int i;
352 union acpi_object *element;
353 if (package->type != ACPI_TYPE_PACKAGE)
354 return -EFAULT;
355 for (i = 0; i < num; ++i) {
356 if (package->package.count <= i)
357 return -EFAULT;
358 element = &package->package.elements[i];
359 if (offsets[i].mode) {
360 u8 *ptr = (u8 *)battery + offsets[i].offset;
361 if (element->type == ACPI_TYPE_STRING ||
362 element->type == ACPI_TYPE_BUFFER)
363 strncpy(ptr, element->string.pointer, 32);
364 else if (element->type == ACPI_TYPE_INTEGER) {
365 strncpy(ptr, (u8 *)&element->integer.value,
366 sizeof(u64));
367 ptr[sizeof(u64)] = 0;
368 } else
369 *ptr = 0; /* don't have value */
370 } else {
371 int *x = (int *)((u8 *)battery + offsets[i].offset);
372 *x = (element->type == ACPI_TYPE_INTEGER) ?
373 element->integer.value : -1;
374 }
375 }
376 return 0;
377 }
378
379 static int acpi_battery_get_status(struct acpi_battery *battery)
380 {
381 if (acpi_bus_get_status(battery->device)) {
382 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
383 return -ENODEV;
384 }
385 return 0;
386 }
387
388 static int acpi_battery_get_info(struct acpi_battery *battery)
389 {
390 int result = -EFAULT;
391 acpi_status status = 0;
392 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
393 "_BIX" : "_BIF";
394
395 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
396
397 if (!acpi_battery_present(battery))
398 return 0;
399 mutex_lock(&battery->lock);
400 status = acpi_evaluate_object(battery->device->handle, name,
401 NULL, &buffer);
402 mutex_unlock(&battery->lock);
403
404 if (ACPI_FAILURE(status)) {
405 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
406 return -ENODEV;
407 }
408 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
409 result = extract_package(battery, buffer.pointer,
410 extended_info_offsets,
411 ARRAY_SIZE(extended_info_offsets));
412 else
413 result = extract_package(battery, buffer.pointer,
414 info_offsets, ARRAY_SIZE(info_offsets));
415 kfree(buffer.pointer);
416 return result;
417 }
418
419 static int acpi_battery_get_state(struct acpi_battery *battery)
420 {
421 int result = 0;
422 acpi_status status = 0;
423 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
424
425 if (!acpi_battery_present(battery))
426 return 0;
427
428 if (battery->update_time &&
429 time_before(jiffies, battery->update_time +
430 msecs_to_jiffies(cache_time)))
431 return 0;
432
433 mutex_lock(&battery->lock);
434 status = acpi_evaluate_object(battery->device->handle, "_BST",
435 NULL, &buffer);
436 mutex_unlock(&battery->lock);
437
438 if (ACPI_FAILURE(status)) {
439 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
440 return -ENODEV;
441 }
442
443 result = extract_package(battery, buffer.pointer,
444 state_offsets, ARRAY_SIZE(state_offsets));
445 battery->update_time = jiffies;
446 kfree(buffer.pointer);
447
448 if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
449 battery->rate_now != -1)
450 battery->rate_now = abs((s16)battery->rate_now);
451
452 return result;
453 }
454
455 static int acpi_battery_set_alarm(struct acpi_battery *battery)
456 {
457 acpi_status status = 0;
458 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
459 struct acpi_object_list arg_list = { 1, &arg0 };
460
461 if (!acpi_battery_present(battery) ||
462 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
463 return -ENODEV;
464
465 arg0.integer.value = battery->alarm;
466
467 mutex_lock(&battery->lock);
468 status = acpi_evaluate_object(battery->device->handle, "_BTP",
469 &arg_list, NULL);
470 mutex_unlock(&battery->lock);
471
472 if (ACPI_FAILURE(status))
473 return -ENODEV;
474
475 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
476 return 0;
477 }
478
479 static int acpi_battery_init_alarm(struct acpi_battery *battery)
480 {
481 acpi_status status = AE_OK;
482 acpi_handle handle = NULL;
483
484 /* See if alarms are supported, and if so, set default */
485 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
486 if (ACPI_FAILURE(status)) {
487 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
488 return 0;
489 }
490 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
491 if (!battery->alarm)
492 battery->alarm = battery->design_capacity_warning;
493 return acpi_battery_set_alarm(battery);
494 }
495
496 #ifdef CONFIG_ACPI_SYSFS_POWER
497 static ssize_t acpi_battery_alarm_show(struct device *dev,
498 struct device_attribute *attr,
499 char *buf)
500 {
501 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
502 return sprintf(buf, "%d\n", battery->alarm * 1000);
503 }
504
505 static ssize_t acpi_battery_alarm_store(struct device *dev,
506 struct device_attribute *attr,
507 const char *buf, size_t count)
508 {
509 unsigned long x;
510 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
511 if (sscanf(buf, "%ld\n", &x) == 1)
512 battery->alarm = x/1000;
513 if (acpi_battery_present(battery))
514 acpi_battery_set_alarm(battery);
515 return count;
516 }
517
518 static struct device_attribute alarm_attr = {
519 .attr = {.name = "alarm", .mode = 0644},
520 .show = acpi_battery_alarm_show,
521 .store = acpi_battery_alarm_store,
522 };
523
524 static int sysfs_add_battery(struct acpi_battery *battery)
525 {
526 int result;
527
528 if (battery->power_unit) {
529 battery->bat.properties = charge_battery_props;
530 battery->bat.num_properties =
531 ARRAY_SIZE(charge_battery_props);
532 } else {
533 battery->bat.properties = energy_battery_props;
534 battery->bat.num_properties =
535 ARRAY_SIZE(energy_battery_props);
536 }
537
538 battery->bat.name = acpi_device_bid(battery->device);
539 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
540 battery->bat.get_property = acpi_battery_get_property;
541
542 result = power_supply_register(&battery->device->dev, &battery->bat);
543 if (result)
544 return result;
545 return device_create_file(battery->bat.dev, &alarm_attr);
546 }
547
548 static void sysfs_remove_battery(struct acpi_battery *battery)
549 {
550 if (!battery->bat.dev)
551 return;
552 device_remove_file(battery->bat.dev, &alarm_attr);
553 power_supply_unregister(&battery->bat);
554 battery->bat.dev = NULL;
555 }
556 #endif
557
558 static void acpi_battery_quirks(struct acpi_battery *battery)
559 {
560 if (dmi_name_in_vendors("Acer") && battery->power_unit) {
561 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
562 }
563 }
564
565 static int acpi_battery_update(struct acpi_battery *battery)
566 {
567 int result, old_present = acpi_battery_present(battery);
568 result = acpi_battery_get_status(battery);
569 if (result)
570 return result;
571 if (!acpi_battery_present(battery)) {
572 #ifdef CONFIG_ACPI_SYSFS_POWER
573 sysfs_remove_battery(battery);
574 #endif
575 battery->update_time = 0;
576 return 0;
577 }
578 if (!battery->update_time ||
579 old_present != acpi_battery_present(battery)) {
580 result = acpi_battery_get_info(battery);
581 if (result)
582 return result;
583 acpi_battery_quirks(battery);
584 acpi_battery_init_alarm(battery);
585 }
586 #ifdef CONFIG_ACPI_SYSFS_POWER
587 if (!battery->bat.dev)
588 sysfs_add_battery(battery);
589 #endif
590 return acpi_battery_get_state(battery);
591 }
592
593 /* --------------------------------------------------------------------------
594 FS Interface (/proc)
595 -------------------------------------------------------------------------- */
596
597 #ifdef CONFIG_ACPI_PROCFS_POWER
598 static struct proc_dir_entry *acpi_battery_dir;
599
600 static int acpi_battery_print_info(struct seq_file *seq, int result)
601 {
602 struct acpi_battery *battery = seq->private;
603
604 if (result)
605 goto end;
606
607 seq_printf(seq, "present: %s\n",
608 acpi_battery_present(battery)?"yes":"no");
609 if (!acpi_battery_present(battery))
610 goto end;
611 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
612 seq_printf(seq, "design capacity: unknown\n");
613 else
614 seq_printf(seq, "design capacity: %d %sh\n",
615 battery->design_capacity,
616 acpi_battery_units(battery));
617
618 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
619 seq_printf(seq, "last full capacity: unknown\n");
620 else
621 seq_printf(seq, "last full capacity: %d %sh\n",
622 battery->full_charge_capacity,
623 acpi_battery_units(battery));
624
625 seq_printf(seq, "battery technology: %srechargeable\n",
626 (!battery->technology)?"non-":"");
627
628 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
629 seq_printf(seq, "design voltage: unknown\n");
630 else
631 seq_printf(seq, "design voltage: %d mV\n",
632 battery->design_voltage);
633 seq_printf(seq, "design capacity warning: %d %sh\n",
634 battery->design_capacity_warning,
635 acpi_battery_units(battery));
636 seq_printf(seq, "design capacity low: %d %sh\n",
637 battery->design_capacity_low,
638 acpi_battery_units(battery));
639 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
640 seq_printf(seq, "capacity granularity 1: %d %sh\n",
641 battery->capacity_granularity_1,
642 acpi_battery_units(battery));
643 seq_printf(seq, "capacity granularity 2: %d %sh\n",
644 battery->capacity_granularity_2,
645 acpi_battery_units(battery));
646 seq_printf(seq, "model number: %s\n", battery->model_number);
647 seq_printf(seq, "serial number: %s\n", battery->serial_number);
648 seq_printf(seq, "battery type: %s\n", battery->type);
649 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
650 end:
651 if (result)
652 seq_printf(seq, "ERROR: Unable to read battery info\n");
653 return result;
654 }
655
656 static int acpi_battery_print_state(struct seq_file *seq, int result)
657 {
658 struct acpi_battery *battery = seq->private;
659
660 if (result)
661 goto end;
662
663 seq_printf(seq, "present: %s\n",
664 acpi_battery_present(battery)?"yes":"no");
665 if (!acpi_battery_present(battery))
666 goto end;
667
668 seq_printf(seq, "capacity state: %s\n",
669 (battery->state & 0x04)?"critical":"ok");
670 if ((battery->state & 0x01) && (battery->state & 0x02))
671 seq_printf(seq,
672 "charging state: charging/discharging\n");
673 else if (battery->state & 0x01)
674 seq_printf(seq, "charging state: discharging\n");
675 else if (battery->state & 0x02)
676 seq_printf(seq, "charging state: charging\n");
677 else
678 seq_printf(seq, "charging state: charged\n");
679
680 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
681 seq_printf(seq, "present rate: unknown\n");
682 else
683 seq_printf(seq, "present rate: %d %s\n",
684 battery->rate_now, acpi_battery_units(battery));
685
686 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
687 seq_printf(seq, "remaining capacity: unknown\n");
688 else
689 seq_printf(seq, "remaining capacity: %d %sh\n",
690 battery->capacity_now, acpi_battery_units(battery));
691 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
692 seq_printf(seq, "present voltage: unknown\n");
693 else
694 seq_printf(seq, "present voltage: %d mV\n",
695 battery->voltage_now);
696 end:
697 if (result)
698 seq_printf(seq, "ERROR: Unable to read battery state\n");
699
700 return result;
701 }
702
703 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
704 {
705 struct acpi_battery *battery = seq->private;
706
707 if (result)
708 goto end;
709
710 if (!acpi_battery_present(battery)) {
711 seq_printf(seq, "present: no\n");
712 goto end;
713 }
714 seq_printf(seq, "alarm: ");
715 if (!battery->alarm)
716 seq_printf(seq, "unsupported\n");
717 else
718 seq_printf(seq, "%u %sh\n", battery->alarm,
719 acpi_battery_units(battery));
720 end:
721 if (result)
722 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
723 return result;
724 }
725
726 static ssize_t acpi_battery_write_alarm(struct file *file,
727 const char __user * buffer,
728 size_t count, loff_t * ppos)
729 {
730 int result = 0;
731 char alarm_string[12] = { '\0' };
732 struct seq_file *m = file->private_data;
733 struct acpi_battery *battery = m->private;
734
735 if (!battery || (count > sizeof(alarm_string) - 1))
736 return -EINVAL;
737 if (!acpi_battery_present(battery)) {
738 result = -ENODEV;
739 goto end;
740 }
741 if (copy_from_user(alarm_string, buffer, count)) {
742 result = -EFAULT;
743 goto end;
744 }
745 alarm_string[count] = '\0';
746 battery->alarm = simple_strtol(alarm_string, NULL, 0);
747 result = acpi_battery_set_alarm(battery);
748 end:
749 if (!result)
750 return count;
751 return result;
752 }
753
754 typedef int(*print_func)(struct seq_file *seq, int result);
755
756 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
757 acpi_battery_print_info,
758 acpi_battery_print_state,
759 acpi_battery_print_alarm,
760 };
761
762 static int acpi_battery_read(int fid, struct seq_file *seq)
763 {
764 struct acpi_battery *battery = seq->private;
765 int result = acpi_battery_update(battery);
766 return acpi_print_funcs[fid](seq, result);
767 }
768
769 #define DECLARE_FILE_FUNCTIONS(_name) \
770 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
771 { \
772 return acpi_battery_read(_name##_tag, seq); \
773 } \
774 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
775 { \
776 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
777 }
778
779 DECLARE_FILE_FUNCTIONS(info);
780 DECLARE_FILE_FUNCTIONS(state);
781 DECLARE_FILE_FUNCTIONS(alarm);
782
783 #undef DECLARE_FILE_FUNCTIONS
784
785 #define FILE_DESCRIPTION_RO(_name) \
786 { \
787 .name = __stringify(_name), \
788 .mode = S_IRUGO, \
789 .ops = { \
790 .open = acpi_battery_##_name##_open_fs, \
791 .read = seq_read, \
792 .llseek = seq_lseek, \
793 .release = single_release, \
794 .owner = THIS_MODULE, \
795 }, \
796 }
797
798 #define FILE_DESCRIPTION_RW(_name) \
799 { \
800 .name = __stringify(_name), \
801 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
802 .ops = { \
803 .open = acpi_battery_##_name##_open_fs, \
804 .read = seq_read, \
805 .llseek = seq_lseek, \
806 .write = acpi_battery_write_##_name, \
807 .release = single_release, \
808 .owner = THIS_MODULE, \
809 }, \
810 }
811
812 static struct battery_file {
813 struct file_operations ops;
814 mode_t mode;
815 const char *name;
816 } acpi_battery_file[] = {
817 FILE_DESCRIPTION_RO(info),
818 FILE_DESCRIPTION_RO(state),
819 FILE_DESCRIPTION_RW(alarm),
820 };
821
822 #undef FILE_DESCRIPTION_RO
823 #undef FILE_DESCRIPTION_RW
824
825 static int acpi_battery_add_fs(struct acpi_device *device)
826 {
827 struct proc_dir_entry *entry = NULL;
828 int i;
829
830 if (!acpi_device_dir(device)) {
831 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
832 acpi_battery_dir);
833 if (!acpi_device_dir(device))
834 return -ENODEV;
835 }
836
837 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
838 entry = proc_create_data(acpi_battery_file[i].name,
839 acpi_battery_file[i].mode,
840 acpi_device_dir(device),
841 &acpi_battery_file[i].ops,
842 acpi_driver_data(device));
843 if (!entry)
844 return -ENODEV;
845 }
846 return 0;
847 }
848
849 static void acpi_battery_remove_fs(struct acpi_device *device)
850 {
851 int i;
852 if (!acpi_device_dir(device))
853 return;
854 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
855 remove_proc_entry(acpi_battery_file[i].name,
856 acpi_device_dir(device));
857
858 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
859 acpi_device_dir(device) = NULL;
860 }
861
862 #endif
863
864 /* --------------------------------------------------------------------------
865 Driver Interface
866 -------------------------------------------------------------------------- */
867
868 static void acpi_battery_notify(struct acpi_device *device, u32 event)
869 {
870 struct acpi_battery *battery = acpi_driver_data(device);
871 #ifdef CONFIG_ACPI_SYSFS_POWER
872 struct device *old;
873 #endif
874
875 if (!battery)
876 return;
877 #ifdef CONFIG_ACPI_SYSFS_POWER
878 old = battery->bat.dev;
879 #endif
880 acpi_battery_update(battery);
881 acpi_bus_generate_proc_event(device, event,
882 acpi_battery_present(battery));
883 acpi_bus_generate_netlink_event(device->pnp.device_class,
884 dev_name(&device->dev), event,
885 acpi_battery_present(battery));
886 #ifdef CONFIG_ACPI_SYSFS_POWER
887 /* acpi_battery_update could remove power_supply object */
888 if (old && battery->bat.dev)
889 power_supply_changed(&battery->bat);
890 #endif
891 }
892
893 static int acpi_battery_add(struct acpi_device *device)
894 {
895 int result = 0;
896 struct acpi_battery *battery = NULL;
897 acpi_handle handle;
898 if (!device)
899 return -EINVAL;
900 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
901 if (!battery)
902 return -ENOMEM;
903 battery->device = device;
904 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
905 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
906 device->driver_data = battery;
907 mutex_init(&battery->lock);
908 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
909 "_BIX", &handle)))
910 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
911 acpi_battery_update(battery);
912 #ifdef CONFIG_ACPI_PROCFS_POWER
913 result = acpi_battery_add_fs(device);
914 #endif
915 if (!result) {
916 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
917 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
918 device->status.battery_present ? "present" : "absent");
919 } else {
920 #ifdef CONFIG_ACPI_PROCFS_POWER
921 acpi_battery_remove_fs(device);
922 #endif
923 kfree(battery);
924 }
925 return result;
926 }
927
928 static int acpi_battery_remove(struct acpi_device *device, int type)
929 {
930 struct acpi_battery *battery = NULL;
931
932 if (!device || !acpi_driver_data(device))
933 return -EINVAL;
934 battery = acpi_driver_data(device);
935 #ifdef CONFIG_ACPI_PROCFS_POWER
936 acpi_battery_remove_fs(device);
937 #endif
938 #ifdef CONFIG_ACPI_SYSFS_POWER
939 sysfs_remove_battery(battery);
940 #endif
941 mutex_destroy(&battery->lock);
942 kfree(battery);
943 return 0;
944 }
945
946 /* this is needed to learn about changes made in suspended state */
947 static int acpi_battery_resume(struct acpi_device *device)
948 {
949 struct acpi_battery *battery;
950 if (!device)
951 return -EINVAL;
952 battery = acpi_driver_data(device);
953 battery->update_time = 0;
954 acpi_battery_update(battery);
955 return 0;
956 }
957
958 static struct acpi_driver acpi_battery_driver = {
959 .name = "battery",
960 .class = ACPI_BATTERY_CLASS,
961 .ids = battery_device_ids,
962 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
963 .ops = {
964 .add = acpi_battery_add,
965 .resume = acpi_battery_resume,
966 .remove = acpi_battery_remove,
967 .notify = acpi_battery_notify,
968 },
969 };
970
971 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
972 {
973 if (acpi_disabled)
974 return;
975 #ifdef CONFIG_ACPI_PROCFS_POWER
976 acpi_battery_dir = acpi_lock_battery_dir();
977 if (!acpi_battery_dir)
978 return;
979 #endif
980 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
981 #ifdef CONFIG_ACPI_PROCFS_POWER
982 acpi_unlock_battery_dir(acpi_battery_dir);
983 #endif
984 return;
985 }
986 return;
987 }
988
989 static int __init acpi_battery_init(void)
990 {
991 async_schedule(acpi_battery_init_async, NULL);
992 return 0;
993 }
994
995 static void __exit acpi_battery_exit(void)
996 {
997 acpi_bus_unregister_driver(&acpi_battery_driver);
998 #ifdef CONFIG_ACPI_PROCFS_POWER
999 acpi_unlock_battery_dir(acpi_battery_dir);
1000 #endif
1001 }
1002
1003 module_init(acpi_battery_init);
1004 module_exit(acpi_battery_exit);
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