tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
58#define _COMPONENT ACPI_BATTERY_COMPONENT
59
60ACPI_MODULE_NAME("battery");
61
62MODULE_AUTHOR("Paul Diefenbaugh");
63MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
64MODULE_DESCRIPTION("ACPI Battery Driver");
65MODULE_LICENSE("GPL");
66
67static unsigned int cache_time = 1000;
68module_param(cache_time, uint, 0644);
69MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
70
71#ifdef CONFIG_ACPI_PROCFS_POWER
72extern struct proc_dir_entry *acpi_lock_battery_dir(void);
73extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
74
75enum acpi_battery_files {
76 info_tag = 0,
77 state_tag,
78 alarm_tag,
79 ACPI_BATTERY_NUMFILES,
80};
81
82#endif
83
84static const struct acpi_device_id battery_device_ids[] = {
85 {"PNP0C0A", 0},
86 {"", 0},
87};
88
89MODULE_DEVICE_TABLE(acpi, battery_device_ids);
90
91/* For buggy DSDTs that report negative 16-bit values for either charging
92 * or discharging current and/or report 0 as 65536 due to bad math.
93 */
94#define QUIRK_SIGNED16_CURRENT 0x0001
95
96struct acpi_battery {
97 struct mutex lock;
98#ifdef CONFIG_ACPI_SYSFS_POWER
99 struct power_supply bat;
100#endif
101 struct acpi_device *device;
102 unsigned long update_time;
103 int rate_now;
104 int capacity_now;
105 int voltage_now;
106 int design_capacity;
107 int full_charge_capacity;
108 int technology;
109 int design_voltage;
110 int design_capacity_warning;
111 int design_capacity_low;
112 int capacity_granularity_1;
113 int capacity_granularity_2;
114 int alarm;
115 char model_number[32];
116 char serial_number[32];
117 char type[32];
118 char oem_info[32];
119 int state;
120 int power_unit;
121 u8 alarm_present;
122 long quirks;
123};
124
125#define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
126
127inline int acpi_battery_present(struct acpi_battery *battery)
128{
129 return battery->device->status.battery_present;
130}
131
132#ifdef CONFIG_ACPI_SYSFS_POWER
133static int acpi_battery_technology(struct acpi_battery *battery)
134{
135 if (!strcasecmp("NiCd", battery->type))
136 return POWER_SUPPLY_TECHNOLOGY_NiCd;
137 if (!strcasecmp("NiMH", battery->type))
138 return POWER_SUPPLY_TECHNOLOGY_NiMH;
139 if (!strcasecmp("LION", battery->type))
140 return POWER_SUPPLY_TECHNOLOGY_LION;
141 if (!strncasecmp("LI-ION", battery->type, 6))
142 return POWER_SUPPLY_TECHNOLOGY_LION;
143 if (!strcasecmp("LiP", battery->type))
144 return POWER_SUPPLY_TECHNOLOGY_LIPO;
145 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
146}
147
148static int acpi_battery_get_state(struct acpi_battery *battery);
149
150static int acpi_battery_is_charged(struct acpi_battery *battery)
151{
152 /* either charging or discharging */
153 if (battery->state != 0)
154 return 0;
155
156 /* battery not reporting charge */
157 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
158 battery->capacity_now == 0)
159 return 0;
160
161 /* good batteries update full_charge as the batteries degrade */
162 if (battery->full_charge_capacity == battery->capacity_now)
163 return 1;
164
165 /* fallback to using design values for broken batteries */
166 if (battery->design_capacity == battery->capacity_now)
167 return 1;
168
169 /* we don't do any sort of metric based on percentages */
170 return 0;
171}
172
173static int acpi_battery_get_property(struct power_supply *psy,
174 enum power_supply_property psp,
175 union power_supply_propval *val)
176{
177 struct acpi_battery *battery = to_acpi_battery(psy);
178
179 if (acpi_battery_present(battery)) {
180 /* run battery update only if it is present */
181 acpi_battery_get_state(battery);
182 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
183 return -ENODEV;
184 switch (psp) {
185 case POWER_SUPPLY_PROP_STATUS:
186 if (battery->state & 0x01)
187 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
188 else if (battery->state & 0x02)
189 val->intval = POWER_SUPPLY_STATUS_CHARGING;
190 else if (acpi_battery_is_charged(battery))
191 val->intval = POWER_SUPPLY_STATUS_FULL;
192 else
193 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
194 break;
195 case POWER_SUPPLY_PROP_PRESENT:
196 val->intval = acpi_battery_present(battery);
197 break;
198 case POWER_SUPPLY_PROP_TECHNOLOGY:
199 val->intval = acpi_battery_technology(battery);
200 break;
201 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
202 val->intval = battery->design_voltage * 1000;
203 break;
204 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
205 val->intval = battery->voltage_now * 1000;
206 break;
207 case POWER_SUPPLY_PROP_CURRENT_NOW:
208 case POWER_SUPPLY_PROP_POWER_NOW:
209 val->intval = battery->rate_now * 1000;
210 break;
211 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
212 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
213 val->intval = battery->design_capacity * 1000;
214 break;
215 case POWER_SUPPLY_PROP_CHARGE_FULL:
216 case POWER_SUPPLY_PROP_ENERGY_FULL:
217 val->intval = battery->full_charge_capacity * 1000;
218 break;
219 case POWER_SUPPLY_PROP_CHARGE_NOW:
220 case POWER_SUPPLY_PROP_ENERGY_NOW:
221 val->intval = battery->capacity_now * 1000;
222 break;
223 case POWER_SUPPLY_PROP_MODEL_NAME:
224 val->strval = battery->model_number;
225 break;
226 case POWER_SUPPLY_PROP_MANUFACTURER:
227 val->strval = battery->oem_info;
228 break;
229 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
230 val->strval = battery->serial_number;
231 break;
232 default:
233 return -EINVAL;
234 }
235 return 0;
236}
237
238static enum power_supply_property charge_battery_props[] = {
239 POWER_SUPPLY_PROP_STATUS,
240 POWER_SUPPLY_PROP_PRESENT,
241 POWER_SUPPLY_PROP_TECHNOLOGY,
242 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
243 POWER_SUPPLY_PROP_VOLTAGE_NOW,
244 POWER_SUPPLY_PROP_CURRENT_NOW,
245 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
246 POWER_SUPPLY_PROP_CHARGE_FULL,
247 POWER_SUPPLY_PROP_CHARGE_NOW,
248 POWER_SUPPLY_PROP_MODEL_NAME,
249 POWER_SUPPLY_PROP_MANUFACTURER,
250 POWER_SUPPLY_PROP_SERIAL_NUMBER,
251};
252
253static enum power_supply_property energy_battery_props[] = {
254 POWER_SUPPLY_PROP_STATUS,
255 POWER_SUPPLY_PROP_PRESENT,
256 POWER_SUPPLY_PROP_TECHNOLOGY,
257 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
258 POWER_SUPPLY_PROP_VOLTAGE_NOW,
259 POWER_SUPPLY_PROP_CURRENT_NOW,
260 POWER_SUPPLY_PROP_POWER_NOW,
261 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
262 POWER_SUPPLY_PROP_ENERGY_FULL,
263 POWER_SUPPLY_PROP_ENERGY_NOW,
264 POWER_SUPPLY_PROP_MODEL_NAME,
265 POWER_SUPPLY_PROP_MANUFACTURER,
266 POWER_SUPPLY_PROP_SERIAL_NUMBER,
267};
268#endif
269
270#ifdef CONFIG_ACPI_PROCFS_POWER
271inline char *acpi_battery_units(struct acpi_battery *battery)
272{
273 return (battery->power_unit)?"mA":"mW";
274}
275#endif
276
277/* --------------------------------------------------------------------------
278 Battery Management
279 -------------------------------------------------------------------------- */
280struct acpi_offsets {
281 size_t offset; /* offset inside struct acpi_sbs_battery */
282 u8 mode; /* int or string? */
283};
284
285static struct acpi_offsets state_offsets[] = {
286 {offsetof(struct acpi_battery, state), 0},
287 {offsetof(struct acpi_battery, rate_now), 0},
288 {offsetof(struct acpi_battery, capacity_now), 0},
289 {offsetof(struct acpi_battery, voltage_now), 0},
290};
291
292static struct acpi_offsets info_offsets[] = {
293 {offsetof(struct acpi_battery, power_unit), 0},
294 {offsetof(struct acpi_battery, design_capacity), 0},
295 {offsetof(struct acpi_battery, full_charge_capacity), 0},
296 {offsetof(struct acpi_battery, technology), 0},
297 {offsetof(struct acpi_battery, design_voltage), 0},
298 {offsetof(struct acpi_battery, design_capacity_warning), 0},
299 {offsetof(struct acpi_battery, design_capacity_low), 0},
300 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
301 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
302 {offsetof(struct acpi_battery, model_number), 1},
303 {offsetof(struct acpi_battery, serial_number), 1},
304 {offsetof(struct acpi_battery, type), 1},
305 {offsetof(struct acpi_battery, oem_info), 1},
306};
307
308static int extract_package(struct acpi_battery *battery,
309 union acpi_object *package,
310 struct acpi_offsets *offsets, int num)
311{
312 int i;
313 union acpi_object *element;
314 if (package->type != ACPI_TYPE_PACKAGE)
315 return -EFAULT;
316 for (i = 0; i < num; ++i) {
317 if (package->package.count <= i)
318 return -EFAULT;
319 element = &package->package.elements[i];
320 if (offsets[i].mode) {
321 u8 *ptr = (u8 *)battery + offsets[i].offset;
322 if (element->type == ACPI_TYPE_STRING ||
323 element->type == ACPI_TYPE_BUFFER)
324 strncpy(ptr, element->string.pointer, 32);
325 else if (element->type == ACPI_TYPE_INTEGER) {
326 strncpy(ptr, (u8 *)&element->integer.value,
327 sizeof(acpi_integer));
328 ptr[sizeof(acpi_integer)] = 0;
329 } else
330 *ptr = 0; /* don't have value */
331 } else {
332 int *x = (int *)((u8 *)battery + offsets[i].offset);
333 *x = (element->type == ACPI_TYPE_INTEGER) ?
334 element->integer.value : -1;
335 }
336 }
337 return 0;
338}
339
340static int acpi_battery_get_status(struct acpi_battery *battery)
341{
342 if (acpi_bus_get_status(battery->device)) {
343 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
344 return -ENODEV;
345 }
346 return 0;
347}
348
349static int acpi_battery_get_info(struct acpi_battery *battery)
350{
351 int result = -EFAULT;
352 acpi_status status = 0;
353 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
354
355 if (!acpi_battery_present(battery))
356 return 0;
357 mutex_lock(&battery->lock);
358 status = acpi_evaluate_object(battery->device->handle, "_BIF",
359 NULL, &buffer);
360 mutex_unlock(&battery->lock);
361
362 if (ACPI_FAILURE(status)) {
363 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
364 return -ENODEV;
365 }
366
367 result = extract_package(battery, buffer.pointer,
368 info_offsets, ARRAY_SIZE(info_offsets));
369 kfree(buffer.pointer);
370 return result;
371}
372
373static int acpi_battery_get_state(struct acpi_battery *battery)
374{
375 int result = 0;
376 acpi_status status = 0;
377 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
378
379 if (!acpi_battery_present(battery))
380 return 0;
381
382 if (battery->update_time &&
383 time_before(jiffies, battery->update_time +
384 msecs_to_jiffies(cache_time)))
385 return 0;
386
387 mutex_lock(&battery->lock);
388 status = acpi_evaluate_object(battery->device->handle, "_BST",
389 NULL, &buffer);
390 mutex_unlock(&battery->lock);
391
392 if (ACPI_FAILURE(status)) {
393 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
394 return -ENODEV;
395 }
396
397 result = extract_package(battery, buffer.pointer,
398 state_offsets, ARRAY_SIZE(state_offsets));
399 battery->update_time = jiffies;
400 kfree(buffer.pointer);
401
402 if ((battery->quirks & QUIRK_SIGNED16_CURRENT) &&
403 battery->rate_now != -1)
404 battery->rate_now = abs((s16)battery->rate_now);
405
406 return result;
407}
408
409static int acpi_battery_set_alarm(struct acpi_battery *battery)
410{
411 acpi_status status = 0;
412 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
413 struct acpi_object_list arg_list = { 1, &arg0 };
414
415 if (!acpi_battery_present(battery)|| !battery->alarm_present)
416 return -ENODEV;
417
418 arg0.integer.value = battery->alarm;
419
420 mutex_lock(&battery->lock);
421 status = acpi_evaluate_object(battery->device->handle, "_BTP",
422 &arg_list, NULL);
423 mutex_unlock(&battery->lock);
424
425 if (ACPI_FAILURE(status))
426 return -ENODEV;
427
428 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
429 return 0;
430}
431
432static int acpi_battery_init_alarm(struct acpi_battery *battery)
433{
434 acpi_status status = AE_OK;
435 acpi_handle handle = NULL;
436
437 /* See if alarms are supported, and if so, set default */
438 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
439 if (ACPI_FAILURE(status)) {
440 battery->alarm_present = 0;
441 return 0;
442 }
443 battery->alarm_present = 1;
444 if (!battery->alarm)
445 battery->alarm = battery->design_capacity_warning;
446 return acpi_battery_set_alarm(battery);
447}
448
449#ifdef CONFIG_ACPI_SYSFS_POWER
450static ssize_t acpi_battery_alarm_show(struct device *dev,
451 struct device_attribute *attr,
452 char *buf)
453{
454 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
455 return sprintf(buf, "%d\n", battery->alarm * 1000);
456}
457
458static ssize_t acpi_battery_alarm_store(struct device *dev,
459 struct device_attribute *attr,
460 const char *buf, size_t count)
461{
462 unsigned long x;
463 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
464 if (sscanf(buf, "%ld\n", &x) == 1)
465 battery->alarm = x/1000;
466 if (acpi_battery_present(battery))
467 acpi_battery_set_alarm(battery);
468 return count;
469}
470
471static struct device_attribute alarm_attr = {
472 .attr = {.name = "alarm", .mode = 0644},
473 .show = acpi_battery_alarm_show,
474 .store = acpi_battery_alarm_store,
475};
476
477static int sysfs_add_battery(struct acpi_battery *battery)
478{
479 int result;
480
481 if (battery->power_unit) {
482 battery->bat.properties = charge_battery_props;
483 battery->bat.num_properties =
484 ARRAY_SIZE(charge_battery_props);
485 } else {
486 battery->bat.properties = energy_battery_props;
487 battery->bat.num_properties =
488 ARRAY_SIZE(energy_battery_props);
489 }
490
491 battery->bat.name = acpi_device_bid(battery->device);
492 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
493 battery->bat.get_property = acpi_battery_get_property;
494
495 result = power_supply_register(&battery->device->dev, &battery->bat);
496 if (result)
497 return result;
498 return device_create_file(battery->bat.dev, &alarm_attr);
499}
500
501static void sysfs_remove_battery(struct acpi_battery *battery)
502{
503 if (!battery->bat.dev)
504 return;
505 device_remove_file(battery->bat.dev, &alarm_attr);
506 power_supply_unregister(&battery->bat);
507 battery->bat.dev = NULL;
508}
509#endif
510
511static void acpi_battery_quirks(struct acpi_battery *battery)
512{
513 battery->quirks = 0;
514 if (dmi_name_in_vendors("Acer") && battery->power_unit) {
515 battery->quirks |= QUIRK_SIGNED16_CURRENT;
516 }
517}
518
519static int acpi_battery_update(struct acpi_battery *battery)
520{
521 int result, old_present = acpi_battery_present(battery);
522 result = acpi_battery_get_status(battery);
523 if (result)
524 return result;
525#ifdef CONFIG_ACPI_SYSFS_POWER
526 if (!acpi_battery_present(battery)) {
527 sysfs_remove_battery(battery);
528 battery->update_time = 0;
529 return 0;
530 }
531#endif
532 if (!battery->update_time ||
533 old_present != acpi_battery_present(battery)) {
534 result = acpi_battery_get_info(battery);
535 if (result)
536 return result;
537 acpi_battery_quirks(battery);
538 acpi_battery_init_alarm(battery);
539 }
540#ifdef CONFIG_ACPI_SYSFS_POWER
541 if (!battery->bat.dev)
542 sysfs_add_battery(battery);
543#endif
544 return acpi_battery_get_state(battery);
545}
546
547/* --------------------------------------------------------------------------
548 FS Interface (/proc)
549 -------------------------------------------------------------------------- */
550
551#ifdef CONFIG_ACPI_PROCFS_POWER
552static struct proc_dir_entry *acpi_battery_dir;
553
554static int acpi_battery_print_info(struct seq_file *seq, int result)
555{
556 struct acpi_battery *battery = seq->private;
557
558 if (result)
559 goto end;
560
561 seq_printf(seq, "present: %s\n",
562 acpi_battery_present(battery)?"yes":"no");
563 if (!acpi_battery_present(battery))
564 goto end;
565 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
566 seq_printf(seq, "design capacity: unknown\n");
567 else
568 seq_printf(seq, "design capacity: %d %sh\n",
569 battery->design_capacity,
570 acpi_battery_units(battery));
571
572 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
573 seq_printf(seq, "last full capacity: unknown\n");
574 else
575 seq_printf(seq, "last full capacity: %d %sh\n",
576 battery->full_charge_capacity,
577 acpi_battery_units(battery));
578
579 seq_printf(seq, "battery technology: %srechargeable\n",
580 (!battery->technology)?"non-":"");
581
582 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
583 seq_printf(seq, "design voltage: unknown\n");
584 else
585 seq_printf(seq, "design voltage: %d mV\n",
586 battery->design_voltage);
587 seq_printf(seq, "design capacity warning: %d %sh\n",
588 battery->design_capacity_warning,
589 acpi_battery_units(battery));
590 seq_printf(seq, "design capacity low: %d %sh\n",
591 battery->design_capacity_low,
592 acpi_battery_units(battery));
593 seq_printf(seq, "capacity granularity 1: %d %sh\n",
594 battery->capacity_granularity_1,
595 acpi_battery_units(battery));
596 seq_printf(seq, "capacity granularity 2: %d %sh\n",
597 battery->capacity_granularity_2,
598 acpi_battery_units(battery));
599 seq_printf(seq, "model number: %s\n", battery->model_number);
600 seq_printf(seq, "serial number: %s\n", battery->serial_number);
601 seq_printf(seq, "battery type: %s\n", battery->type);
602 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
603 end:
604 if (result)
605 seq_printf(seq, "ERROR: Unable to read battery info\n");
606 return result;
607}
608
609static int acpi_battery_print_state(struct seq_file *seq, int result)
610{
611 struct acpi_battery *battery = seq->private;
612
613 if (result)
614 goto end;
615
616 seq_printf(seq, "present: %s\n",
617 acpi_battery_present(battery)?"yes":"no");
618 if (!acpi_battery_present(battery))
619 goto end;
620
621 seq_printf(seq, "capacity state: %s\n",
622 (battery->state & 0x04)?"critical":"ok");
623 if ((battery->state & 0x01) && (battery->state & 0x02))
624 seq_printf(seq,
625 "charging state: charging/discharging\n");
626 else if (battery->state & 0x01)
627 seq_printf(seq, "charging state: discharging\n");
628 else if (battery->state & 0x02)
629 seq_printf(seq, "charging state: charging\n");
630 else
631 seq_printf(seq, "charging state: charged\n");
632
633 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
634 seq_printf(seq, "present rate: unknown\n");
635 else
636 seq_printf(seq, "present rate: %d %s\n",
637 battery->rate_now, acpi_battery_units(battery));
638
639 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
640 seq_printf(seq, "remaining capacity: unknown\n");
641 else
642 seq_printf(seq, "remaining capacity: %d %sh\n",
643 battery->capacity_now, acpi_battery_units(battery));
644 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
645 seq_printf(seq, "present voltage: unknown\n");
646 else
647 seq_printf(seq, "present voltage: %d mV\n",
648 battery->voltage_now);
649 end:
650 if (result)
651 seq_printf(seq, "ERROR: Unable to read battery state\n");
652
653 return result;
654}
655
656static int acpi_battery_print_alarm(struct seq_file *seq, int result)
657{
658 struct acpi_battery *battery = seq->private;
659
660 if (result)
661 goto end;
662
663 if (!acpi_battery_present(battery)) {
664 seq_printf(seq, "present: no\n");
665 goto end;
666 }
667 seq_printf(seq, "alarm: ");
668 if (!battery->alarm)
669 seq_printf(seq, "unsupported\n");
670 else
671 seq_printf(seq, "%u %sh\n", battery->alarm,
672 acpi_battery_units(battery));
673 end:
674 if (result)
675 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
676 return result;
677}
678
679static ssize_t acpi_battery_write_alarm(struct file *file,
680 const char __user * buffer,
681 size_t count, loff_t * ppos)
682{
683 int result = 0;
684 char alarm_string[12] = { '\0' };
685 struct seq_file *m = file->private_data;
686 struct acpi_battery *battery = m->private;
687
688 if (!battery || (count > sizeof(alarm_string) - 1))
689 return -EINVAL;
690 if (!acpi_battery_present(battery)) {
691 result = -ENODEV;
692 goto end;
693 }
694 if (copy_from_user(alarm_string, buffer, count)) {
695 result = -EFAULT;
696 goto end;
697 }
698 alarm_string[count] = '\0';
699 battery->alarm = simple_strtol(alarm_string, NULL, 0);
700 result = acpi_battery_set_alarm(battery);
701 end:
702 if (!result)
703 return count;
704 return result;
705}
706
707typedef int(*print_func)(struct seq_file *seq, int result);
708
709static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
710 acpi_battery_print_info,
711 acpi_battery_print_state,
712 acpi_battery_print_alarm,
713};
714
715static int acpi_battery_read(int fid, struct seq_file *seq)
716{
717 struct acpi_battery *battery = seq->private;
718 int result = acpi_battery_update(battery);
719 return acpi_print_funcs[fid](seq, result);
720}
721
722#define DECLARE_FILE_FUNCTIONS(_name) \
723static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
724{ \
725 return acpi_battery_read(_name##_tag, seq); \
726} \
727static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
728{ \
729 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
730}
731
732DECLARE_FILE_FUNCTIONS(info);
733DECLARE_FILE_FUNCTIONS(state);
734DECLARE_FILE_FUNCTIONS(alarm);
735
736#undef DECLARE_FILE_FUNCTIONS
737
738#define FILE_DESCRIPTION_RO(_name) \
739 { \
740 .name = __stringify(_name), \
741 .mode = S_IRUGO, \
742 .ops = { \
743 .open = acpi_battery_##_name##_open_fs, \
744 .read = seq_read, \
745 .llseek = seq_lseek, \
746 .release = single_release, \
747 .owner = THIS_MODULE, \
748 }, \
749 }
750
751#define FILE_DESCRIPTION_RW(_name) \
752 { \
753 .name = __stringify(_name), \
754 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
755 .ops = { \
756 .open = acpi_battery_##_name##_open_fs, \
757 .read = seq_read, \
758 .llseek = seq_lseek, \
759 .write = acpi_battery_write_##_name, \
760 .release = single_release, \
761 .owner = THIS_MODULE, \
762 }, \
763 }
764
765static struct battery_file {
766 struct file_operations ops;
767 mode_t mode;
768 const char *name;
769} acpi_battery_file[] = {
770 FILE_DESCRIPTION_RO(info),
771 FILE_DESCRIPTION_RO(state),
772 FILE_DESCRIPTION_RW(alarm),
773};
774
775#undef FILE_DESCRIPTION_RO
776#undef FILE_DESCRIPTION_RW
777
778static int acpi_battery_add_fs(struct acpi_device *device)
779{
780 struct proc_dir_entry *entry = NULL;
781 int i;
782
783 if (!acpi_device_dir(device)) {
784 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
785 acpi_battery_dir);
786 if (!acpi_device_dir(device))
787 return -ENODEV;
788 }
789
790 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
791 entry = proc_create_data(acpi_battery_file[i].name,
792 acpi_battery_file[i].mode,
793 acpi_device_dir(device),
794 &acpi_battery_file[i].ops,
795 acpi_driver_data(device));
796 if (!entry)
797 return -ENODEV;
798 }
799 return 0;
800}
801
802static void acpi_battery_remove_fs(struct acpi_device *device)
803{
804 int i;
805 if (!acpi_device_dir(device))
806 return;
807 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
808 remove_proc_entry(acpi_battery_file[i].name,
809 acpi_device_dir(device));
810
811 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
812 acpi_device_dir(device) = NULL;
813}
814
815#endif
816
817/* --------------------------------------------------------------------------
818 Driver Interface
819 -------------------------------------------------------------------------- */
820
821static void acpi_battery_notify(struct acpi_device *device, u32 event)
822{
823 struct acpi_battery *battery = acpi_driver_data(device);
824
825 if (!battery)
826 return;
827 acpi_battery_update(battery);
828 acpi_bus_generate_proc_event(device, event,
829 acpi_battery_present(battery));
830 acpi_bus_generate_netlink_event(device->pnp.device_class,
831 dev_name(&device->dev), event,
832 acpi_battery_present(battery));
833#ifdef CONFIG_ACPI_SYSFS_POWER
834 /* acpi_batter_update could remove power_supply object */
835 if (battery->bat.dev)
836 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
837#endif
838}
839
840static int acpi_battery_add(struct acpi_device *device)
841{
842 int result = 0;
843 struct acpi_battery *battery = NULL;
844 if (!device)
845 return -EINVAL;
846 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
847 if (!battery)
848 return -ENOMEM;
849 battery->device = device;
850 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
851 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
852 device->driver_data = battery;
853 mutex_init(&battery->lock);
854 acpi_battery_update(battery);
855#ifdef CONFIG_ACPI_PROCFS_POWER
856 result = acpi_battery_add_fs(device);
857#endif
858 if (!result) {
859 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
860 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
861 device->status.battery_present ? "present" : "absent");
862 } else {
863#ifdef CONFIG_ACPI_PROCFS_POWER
864 acpi_battery_remove_fs(device);
865#endif
866 kfree(battery);
867 }
868 return result;
869}
870
871static int acpi_battery_remove(struct acpi_device *device, int type)
872{
873 struct acpi_battery *battery = NULL;
874
875 if (!device || !acpi_driver_data(device))
876 return -EINVAL;
877 battery = acpi_driver_data(device);
878#ifdef CONFIG_ACPI_PROCFS_POWER
879 acpi_battery_remove_fs(device);
880#endif
881#ifdef CONFIG_ACPI_SYSFS_POWER
882 sysfs_remove_battery(battery);
883#endif
884 mutex_destroy(&battery->lock);
885 kfree(battery);
886 return 0;
887}
888
889/* this is needed to learn about changes made in suspended state */
890static int acpi_battery_resume(struct acpi_device *device)
891{
892 struct acpi_battery *battery;
893 if (!device)
894 return -EINVAL;
895 battery = acpi_driver_data(device);
896 battery->update_time = 0;
897 acpi_battery_update(battery);
898 return 0;
899}
900
901static struct acpi_driver acpi_battery_driver = {
902 .name = "battery",
903 .class = ACPI_BATTERY_CLASS,
904 .ids = battery_device_ids,
905 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
906 .ops = {
907 .add = acpi_battery_add,
908 .resume = acpi_battery_resume,
909 .remove = acpi_battery_remove,
910 .notify = acpi_battery_notify,
911 },
912};
913
914static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
915{
916 if (acpi_disabled)
917 return;
918#ifdef CONFIG_ACPI_PROCFS_POWER
919 acpi_battery_dir = acpi_lock_battery_dir();
920 if (!acpi_battery_dir)
921 return;
922#endif
923 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
924#ifdef CONFIG_ACPI_PROCFS_POWER
925 acpi_unlock_battery_dir(acpi_battery_dir);
926#endif
927 return;
928 }
929 return;
930}
931
932static int __init acpi_battery_init(void)
933{
934 async_schedule(acpi_battery_init_async, NULL);
935 return 0;
936}
937
938static void __exit acpi_battery_exit(void)
939{
940 acpi_bus_unregister_driver(&acpi_battery_driver);
941#ifdef CONFIG_ACPI_PROCFS_POWER
942 acpi_unlock_battery_dir(acpi_battery_dir);
943#endif
944}
945
946module_init(acpi_battery_init);
947module_exit(acpi_battery_exit);