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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
57ACPI_MODULE_NAME("battery");
58
59MODULE_AUTHOR("Paul Diefenbaugh");
60MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
61MODULE_DESCRIPTION("ACPI Battery Driver");
62MODULE_LICENSE("GPL");
63
64static unsigned int cache_time = 1000;
65module_param(cache_time, uint, 0644);
66MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
67
68#ifdef CONFIG_ACPI_PROCFS_POWER
69extern struct proc_dir_entry *acpi_lock_battery_dir(void);
70extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
71
72enum acpi_battery_files {
73 info_tag = 0,
74 state_tag,
75 alarm_tag,
76 ACPI_BATTERY_NUMFILES,
77};
78
79#endif
80
81static const struct acpi_device_id battery_device_ids[] = {
82 {"PNP0C0A", 0},
83 {"", 0},
84};
85
86MODULE_DEVICE_TABLE(acpi, battery_device_ids);
87
88
89struct 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
119inline int acpi_battery_present(struct acpi_battery *battery)
120{
121 return battery->device->status.battery_present;
122}
123
124#ifdef CONFIG_ACPI_SYSFS_POWER
125static 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
140static int acpi_battery_get_state(struct acpi_battery *battery);
141
142static int acpi_battery_is_charged(struct acpi_battery *battery)
143{
144
145 if (battery->state != 0)
146 return 0;
147
148
149 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
150 battery->capacity_now == 0)
151 return 0;
152
153
154 if (battery->full_charge_capacity == battery->capacity_now)
155 return 1;
156
157
158 if (battery->design_capacity == battery->capacity_now)
159 return 1;
160
161
162 return 0;
163}
164
165static 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
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
230static 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
245static 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
263inline char *acpi_battery_units(struct acpi_battery *battery)
264{
265 return (battery->power_unit)?"mA":"mW";
266}
267#endif
268
269
270
271
272struct acpi_offsets {
273 size_t offset;
274 u8 mode;
275};
276
277static 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
284static 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
300static 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;
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
332static 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
341static 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
365static 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
396static 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
419static int acpi_battery_init_alarm(struct acpi_battery *battery)
420{
421 acpi_status status = AE_OK;
422 acpi_handle handle = NULL;
423
424
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
437static 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
445static 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
458static 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
464static 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
488static 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
498static 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
527
528
529#ifdef CONFIG_ACPI_PROCFS_POWER
530static struct proc_dir_entry *acpi_battery_dir;
531
532static 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
587static 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
634static 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
657static 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
685typedef int(*print_func)(struct seq_file *seq, int result);
686
687static 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
693static 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) \
701static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
702{ \
703 return acpi_battery_read(_name##_tag, seq); \
704} \
705static 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
710DECLARE_FILE_FUNCTIONS(info);
711DECLARE_FILE_FUNCTIONS(state);
712DECLARE_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
743static 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
756static 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
780static 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
797
798
799static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
800{
801 struct acpi_battery *battery = data;
802 struct acpi_device *device;
803 if (!battery)
804 return;
805 device = battery->device;
806 acpi_battery_update(battery);
807 acpi_bus_generate_proc_event(device, event,
808 acpi_battery_present(battery));
809 acpi_bus_generate_netlink_event(device->pnp.device_class,
810 dev_name(&device->dev), event,
811 acpi_battery_present(battery));
812#ifdef CONFIG_ACPI_SYSFS_POWER
813
814 if (battery->bat.dev)
815 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
816#endif
817}
818
819static int acpi_battery_add(struct acpi_device *device)
820{
821 int result = 0;
822 acpi_status status = 0;
823 struct acpi_battery *battery = NULL;
824 if (!device)
825 return -EINVAL;
826 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
827 if (!battery)
828 return -ENOMEM;
829 battery->device = device;
830 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
831 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
832 device->driver_data = battery;
833 mutex_init(&battery->lock);
834 acpi_battery_update(battery);
835#ifdef CONFIG_ACPI_PROCFS_POWER
836 result = acpi_battery_add_fs(device);
837 if (result)
838 goto end;
839#endif
840 status = acpi_install_notify_handler(device->handle,
841 ACPI_ALL_NOTIFY,
842 acpi_battery_notify, battery);
843 if (ACPI_FAILURE(status)) {
844 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
845 result = -ENODEV;
846 goto end;
847 }
848 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
849 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
850 device->status.battery_present ? "present" : "absent");
851 end:
852 if (result) {
853#ifdef CONFIG_ACPI_PROCFS_POWER
854 acpi_battery_remove_fs(device);
855#endif
856 kfree(battery);
857 }
858 return result;
859}
860
861static int acpi_battery_remove(struct acpi_device *device, int type)
862{
863 acpi_status status = 0;
864 struct acpi_battery *battery = NULL;
865
866 if (!device || !acpi_driver_data(device))
867 return -EINVAL;
868 battery = acpi_driver_data(device);
869 status = acpi_remove_notify_handler(device->handle,
870 ACPI_ALL_NOTIFY,
871 acpi_battery_notify);
872#ifdef CONFIG_ACPI_PROCFS_POWER
873 acpi_battery_remove_fs(device);
874#endif
875#ifdef CONFIG_ACPI_SYSFS_POWER
876 sysfs_remove_battery(battery);
877#endif
878 mutex_destroy(&battery->lock);
879 kfree(battery);
880 return 0;
881}
882
883
884static int acpi_battery_resume(struct acpi_device *device)
885{
886 struct acpi_battery *battery;
887 if (!device)
888 return -EINVAL;
889 battery = acpi_driver_data(device);
890 battery->update_time = 0;
891 acpi_battery_update(battery);
892 return 0;
893}
894
895static struct acpi_driver acpi_battery_driver = {
896 .name = "battery",
897 .class = ACPI_BATTERY_CLASS,
898 .ids = battery_device_ids,
899 .ops = {
900 .add = acpi_battery_add,
901 .resume = acpi_battery_resume,
902 .remove = acpi_battery_remove,
903 },
904};
905
906static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
907{
908 if (acpi_disabled)
909 return;
910#ifdef CONFIG_ACPI_PROCFS_POWER
911 acpi_battery_dir = acpi_lock_battery_dir();
912 if (!acpi_battery_dir)
913 return;
914#endif
915 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
916#ifdef CONFIG_ACPI_PROCFS_POWER
917 acpi_unlock_battery_dir(acpi_battery_dir);
918#endif
919 return;
920 }
921 return;
922}
923
924static int __init acpi_battery_init(void)
925{
926 async_schedule(acpi_battery_init_async, NULL);
927 return 0;
928}
929
930static void __exit acpi_battery_exit(void)
931{
932 acpi_bus_unregister_driver(&acpi_battery_driver);
933#ifdef CONFIG_ACPI_PROCFS_POWER
934 acpi_unlock_battery_dir(acpi_battery_dir);
935#endif
936}
937
938module_init(acpi_battery_init);
939module_exit(acpi_battery_exit);
940
