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hugetlb: make unmap_ref_private multi-size-aware
[zen-stable.git] / drivers / acpi / battery.c
blob1423b0c0cd2eecc6e3c7b2f5c78746cee5fac4eb
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
34 #ifdef CONFIG_ACPI_PROCFS_POWER
35 #include <linux/proc_fs.h>
36 #include <linux/seq_file.h>
37 #include <asm/uaccess.h>
38 #endif
39
40 #include <acpi/acpi_bus.h>
41 #include <acpi/acpi_drivers.h>
42
43 #ifdef CONFIG_ACPI_SYSFS_POWER
44 #include <linux/power_supply.h>
45 #endif
46
47 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
48
49 #define ACPI_BATTERY_CLASS "battery"
50 #define ACPI_BATTERY_DEVICE_NAME "Battery"
51 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
52 #define ACPI_BATTERY_NOTIFY_INFO 0x81
53
54 #define _COMPONENT ACPI_BATTERY_COMPONENT
55
56 ACPI_MODULE_NAME("battery");
57
58 MODULE_AUTHOR("Paul Diefenbaugh");
59 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
60 MODULE_DESCRIPTION("ACPI Battery Driver");
61 MODULE_LICENSE("GPL");
62
63 static unsigned int cache_time = 1000;
64 module_param(cache_time, uint, 0644);
65 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
66
67 #ifdef CONFIG_ACPI_PROCFS_POWER
68 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
69 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
70
71 enum acpi_battery_files {
72 info_tag = 0,
73 state_tag,
74 alarm_tag,
75 ACPI_BATTERY_NUMFILES,
76 };
77
78 #endif
79
80 static const struct acpi_device_id battery_device_ids[] = {
81 {"PNP0C0A", 0},
82 {"", 0},
83 };
84
85 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
86
87
88 struct acpi_battery {
89 struct mutex lock;
90 #ifdef CONFIG_ACPI_SYSFS_POWER
91 struct power_supply bat;
92 #endif
93 struct acpi_device *device;
94 unsigned long update_time;
95 int current_now;
96 int capacity_now;
97 int voltage_now;
98 int design_capacity;
99 int full_charge_capacity;
100 int technology;
101 int design_voltage;
102 int design_capacity_warning;
103 int design_capacity_low;
104 int capacity_granularity_1;
105 int capacity_granularity_2;
106 int alarm;
107 char model_number[32];
108 char serial_number[32];
109 char type[32];
110 char oem_info[32];
111 int state;
112 int power_unit;
113 u8 alarm_present;
114 };
115
116 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
117
118 inline int acpi_battery_present(struct acpi_battery *battery)
119 {
120 return battery->device->status.battery_present;
121 }
122
123 #ifdef CONFIG_ACPI_SYSFS_POWER
124 static int acpi_battery_technology(struct acpi_battery *battery)
125 {
126 if (!strcasecmp("NiCd", battery->type))
127 return POWER_SUPPLY_TECHNOLOGY_NiCd;
128 if (!strcasecmp("NiMH", battery->type))
129 return POWER_SUPPLY_TECHNOLOGY_NiMH;
130 if (!strcasecmp("LION", battery->type))
131 return POWER_SUPPLY_TECHNOLOGY_LION;
132 if (!strncasecmp("LI-ION", battery->type, 6))
133 return POWER_SUPPLY_TECHNOLOGY_LION;
134 if (!strcasecmp("LiP", battery->type))
135 return POWER_SUPPLY_TECHNOLOGY_LIPO;
136 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
137 }
138
139 static int acpi_battery_get_state(struct acpi_battery *battery);
140
141 static int acpi_battery_get_property(struct power_supply *psy,
142 enum power_supply_property psp,
143 union power_supply_propval *val)
144 {
145 struct acpi_battery *battery = to_acpi_battery(psy);
146
147 if (acpi_battery_present(battery)) {
148 /* run battery update only if it is present */
149 acpi_battery_get_state(battery);
150 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
151 return -ENODEV;
152 switch (psp) {
153 case POWER_SUPPLY_PROP_STATUS:
154 if (battery->state & 0x01)
155 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
156 else if (battery->state & 0x02)
157 val->intval = POWER_SUPPLY_STATUS_CHARGING;
158 else if (battery->state == 0)
159 val->intval = POWER_SUPPLY_STATUS_FULL;
160 else
161 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
162 break;
163 case POWER_SUPPLY_PROP_PRESENT:
164 val->intval = acpi_battery_present(battery);
165 break;
166 case POWER_SUPPLY_PROP_TECHNOLOGY:
167 val->intval = acpi_battery_technology(battery);
168 break;
169 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
170 val->intval = battery->design_voltage * 1000;
171 break;
172 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
173 val->intval = battery->voltage_now * 1000;
174 break;
175 case POWER_SUPPLY_PROP_CURRENT_NOW:
176 val->intval = battery->current_now * 1000;
177 break;
178 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
179 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
180 val->intval = battery->design_capacity * 1000;
181 break;
182 case POWER_SUPPLY_PROP_CHARGE_FULL:
183 case POWER_SUPPLY_PROP_ENERGY_FULL:
184 val->intval = battery->full_charge_capacity * 1000;
185 break;
186 case POWER_SUPPLY_PROP_CHARGE_NOW:
187 case POWER_SUPPLY_PROP_ENERGY_NOW:
188 val->intval = battery->capacity_now * 1000;
189 break;
190 case POWER_SUPPLY_PROP_MODEL_NAME:
191 val->strval = battery->model_number;
192 break;
193 case POWER_SUPPLY_PROP_MANUFACTURER:
194 val->strval = battery->oem_info;
195 break;
196 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
197 val->strval = battery->serial_number;
198 break;
199 default:
200 return -EINVAL;
201 }
202 return 0;
203 }
204
205 static enum power_supply_property charge_battery_props[] = {
206 POWER_SUPPLY_PROP_STATUS,
207 POWER_SUPPLY_PROP_PRESENT,
208 POWER_SUPPLY_PROP_TECHNOLOGY,
209 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
210 POWER_SUPPLY_PROP_VOLTAGE_NOW,
211 POWER_SUPPLY_PROP_CURRENT_NOW,
212 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
213 POWER_SUPPLY_PROP_CHARGE_FULL,
214 POWER_SUPPLY_PROP_CHARGE_NOW,
215 POWER_SUPPLY_PROP_MODEL_NAME,
216 POWER_SUPPLY_PROP_MANUFACTURER,
217 POWER_SUPPLY_PROP_SERIAL_NUMBER,
218 };
219
220 static enum power_supply_property energy_battery_props[] = {
221 POWER_SUPPLY_PROP_STATUS,
222 POWER_SUPPLY_PROP_PRESENT,
223 POWER_SUPPLY_PROP_TECHNOLOGY,
224 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
225 POWER_SUPPLY_PROP_VOLTAGE_NOW,
226 POWER_SUPPLY_PROP_CURRENT_NOW,
227 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
228 POWER_SUPPLY_PROP_ENERGY_FULL,
229 POWER_SUPPLY_PROP_ENERGY_NOW,
230 POWER_SUPPLY_PROP_MODEL_NAME,
231 POWER_SUPPLY_PROP_MANUFACTURER,
232 POWER_SUPPLY_PROP_SERIAL_NUMBER,
233 };
234 #endif
235
236 #ifdef CONFIG_ACPI_PROCFS_POWER
237 inline char *acpi_battery_units(struct acpi_battery *battery)
238 {
239 return (battery->power_unit)?"mA":"mW";
240 }
241 #endif
242
243 /* --------------------------------------------------------------------------
244 Battery Management
245 -------------------------------------------------------------------------- */
246 struct acpi_offsets {
247 size_t offset; /* offset inside struct acpi_sbs_battery */
248 u8 mode; /* int or string? */
249 };
250
251 static struct acpi_offsets state_offsets[] = {
252 {offsetof(struct acpi_battery, state), 0},
253 {offsetof(struct acpi_battery, current_now), 0},
254 {offsetof(struct acpi_battery, capacity_now), 0},
255 {offsetof(struct acpi_battery, voltage_now), 0},
256 };
257
258 static struct acpi_offsets info_offsets[] = {
259 {offsetof(struct acpi_battery, power_unit), 0},
260 {offsetof(struct acpi_battery, design_capacity), 0},
261 {offsetof(struct acpi_battery, full_charge_capacity), 0},
262 {offsetof(struct acpi_battery, technology), 0},
263 {offsetof(struct acpi_battery, design_voltage), 0},
264 {offsetof(struct acpi_battery, design_capacity_warning), 0},
265 {offsetof(struct acpi_battery, design_capacity_low), 0},
266 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
267 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
268 {offsetof(struct acpi_battery, model_number), 1},
269 {offsetof(struct acpi_battery, serial_number), 1},
270 {offsetof(struct acpi_battery, type), 1},
271 {offsetof(struct acpi_battery, oem_info), 1},
272 };
273
274 static int extract_package(struct acpi_battery *battery,
275 union acpi_object *package,
276 struct acpi_offsets *offsets, int num)
277 {
278 int i;
279 union acpi_object *element;
280 if (package->type != ACPI_TYPE_PACKAGE)
281 return -EFAULT;
282 for (i = 0; i < num; ++i) {
283 if (package->package.count <= i)
284 return -EFAULT;
285 element = &package->package.elements[i];
286 if (offsets[i].mode) {
287 u8 *ptr = (u8 *)battery + offsets[i].offset;
288 if (element->type == ACPI_TYPE_STRING ||
289 element->type == ACPI_TYPE_BUFFER)
290 strncpy(ptr, element->string.pointer, 32);
291 else if (element->type == ACPI_TYPE_INTEGER) {
292 strncpy(ptr, (u8 *)&element->integer.value,
293 sizeof(acpi_integer));
294 ptr[sizeof(acpi_integer)] = 0;
295 } else
296 *ptr = 0; /* don't have value */
297 } else {
298 int *x = (int *)((u8 *)battery + offsets[i].offset);
299 *x = (element->type == ACPI_TYPE_INTEGER) ?
300 element->integer.value : -1;
301 }
302 }
303 return 0;
304 }
305
306 static int acpi_battery_get_status(struct acpi_battery *battery)
307 {
308 if (acpi_bus_get_status(battery->device)) {
309 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
310 return -ENODEV;
311 }
312 return 0;
313 }
314
315 static int acpi_battery_get_info(struct acpi_battery *battery)
316 {
317 int result = -EFAULT;
318 acpi_status status = 0;
319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
320
321 if (!acpi_battery_present(battery))
322 return 0;
323 mutex_lock(&battery->lock);
324 status = acpi_evaluate_object(battery->device->handle, "_BIF",
325 NULL, &buffer);
326 mutex_unlock(&battery->lock);
327
328 if (ACPI_FAILURE(status)) {
329 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
330 return -ENODEV;
331 }
332
333 result = extract_package(battery, buffer.pointer,
334 info_offsets, ARRAY_SIZE(info_offsets));
335 kfree(buffer.pointer);
336 return result;
337 }
338
339 static int acpi_battery_get_state(struct acpi_battery *battery)
340 {
341 int result = 0;
342 acpi_status status = 0;
343 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
344
345 if (!acpi_battery_present(battery))
346 return 0;
347
348 if (battery->update_time &&
349 time_before(jiffies, battery->update_time +
350 msecs_to_jiffies(cache_time)))
351 return 0;
352
353 mutex_lock(&battery->lock);
354 status = acpi_evaluate_object(battery->device->handle, "_BST",
355 NULL, &buffer);
356 mutex_unlock(&battery->lock);
357
358 if (ACPI_FAILURE(status)) {
359 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
360 return -ENODEV;
361 }
362
363 result = extract_package(battery, buffer.pointer,
364 state_offsets, ARRAY_SIZE(state_offsets));
365 battery->update_time = jiffies;
366 kfree(buffer.pointer);
367 return result;
368 }
369
370 static int acpi_battery_set_alarm(struct acpi_battery *battery)
371 {
372 acpi_status status = 0;
373 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
374 struct acpi_object_list arg_list = { 1, &arg0 };
375
376 if (!acpi_battery_present(battery)|| !battery->alarm_present)
377 return -ENODEV;
378
379 arg0.integer.value = battery->alarm;
380
381 mutex_lock(&battery->lock);
382 status = acpi_evaluate_object(battery->device->handle, "_BTP",
383 &arg_list, NULL);
384 mutex_unlock(&battery->lock);
385
386 if (ACPI_FAILURE(status))
387 return -ENODEV;
388
389 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
390 return 0;
391 }
392
393 static int acpi_battery_init_alarm(struct acpi_battery *battery)
394 {
395 acpi_status status = AE_OK;
396 acpi_handle handle = NULL;
397
398 /* See if alarms are supported, and if so, set default */
399 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
400 if (ACPI_FAILURE(status)) {
401 battery->alarm_present = 0;
402 return 0;
403 }
404 battery->alarm_present = 1;
405 if (!battery->alarm)
406 battery->alarm = battery->design_capacity_warning;
407 return acpi_battery_set_alarm(battery);
408 }
409
410 #ifdef CONFIG_ACPI_SYSFS_POWER
411 static ssize_t acpi_battery_alarm_show(struct device *dev,
412 struct device_attribute *attr,
413 char *buf)
414 {
415 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
416 return sprintf(buf, "%d\n", battery->alarm * 1000);
417 }
418
419 static ssize_t acpi_battery_alarm_store(struct device *dev,
420 struct device_attribute *attr,
421 const char *buf, size_t count)
422 {
423 unsigned long x;
424 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
425 if (sscanf(buf, "%ld\n", &x) == 1)
426 battery->alarm = x/1000;
427 if (acpi_battery_present(battery))
428 acpi_battery_set_alarm(battery);
429 return count;
430 }
431
432 static struct device_attribute alarm_attr = {
433 .attr = {.name = "alarm", .mode = 0644},
434 .show = acpi_battery_alarm_show,
435 .store = acpi_battery_alarm_store,
436 };
437
438 static int sysfs_add_battery(struct acpi_battery *battery)
439 {
440 int result;
441
442 if (battery->power_unit) {
443 battery->bat.properties = charge_battery_props;
444 battery->bat.num_properties =
445 ARRAY_SIZE(charge_battery_props);
446 } else {
447 battery->bat.properties = energy_battery_props;
448 battery->bat.num_properties =
449 ARRAY_SIZE(energy_battery_props);
450 }
451
452 battery->bat.name = acpi_device_bid(battery->device);
453 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
454 battery->bat.get_property = acpi_battery_get_property;
455
456 result = power_supply_register(&battery->device->dev, &battery->bat);
457 if (result)
458 return result;
459 return device_create_file(battery->bat.dev, &alarm_attr);
460 }
461
462 static void sysfs_remove_battery(struct acpi_battery *battery)
463 {
464 if (!battery->bat.dev)
465 return;
466 device_remove_file(battery->bat.dev, &alarm_attr);
467 power_supply_unregister(&battery->bat);
468 battery->bat.dev = NULL;
469 }
470 #endif
471
472 static int acpi_battery_update(struct acpi_battery *battery)
473 {
474 int result;
475 result = acpi_battery_get_status(battery);
476 if (result)
477 return result;
478 #ifdef CONFIG_ACPI_SYSFS_POWER
479 if (!acpi_battery_present(battery)) {
480 sysfs_remove_battery(battery);
481 battery->update_time = 0;
482 return 0;
483 }
484 #endif
485 if (!battery->update_time) {
486 result = acpi_battery_get_info(battery);
487 if (result)
488 return result;
489 acpi_battery_init_alarm(battery);
490 }
491 #ifdef CONFIG_ACPI_SYSFS_POWER
492 if (!battery->bat.dev)
493 sysfs_add_battery(battery);
494 #endif
495 return acpi_battery_get_state(battery);
496 }
497
498 /* --------------------------------------------------------------------------
499 FS Interface (/proc)
500 -------------------------------------------------------------------------- */
501
502 #ifdef CONFIG_ACPI_PROCFS_POWER
503 static struct proc_dir_entry *acpi_battery_dir;
504
505 static int acpi_battery_print_info(struct seq_file *seq, int result)
506 {
507 struct acpi_battery *battery = seq->private;
508
509 if (result)
510 goto end;
511
512 seq_printf(seq, "present: %s\n",
513 acpi_battery_present(battery)?"yes":"no");
514 if (!acpi_battery_present(battery))
515 goto end;
516 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
517 seq_printf(seq, "design capacity: unknown\n");
518 else
519 seq_printf(seq, "design capacity: %d %sh\n",
520 battery->design_capacity,
521 acpi_battery_units(battery));
522
523 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
524 seq_printf(seq, "last full capacity: unknown\n");
525 else
526 seq_printf(seq, "last full capacity: %d %sh\n",
527 battery->full_charge_capacity,
528 acpi_battery_units(battery));
529
530 seq_printf(seq, "battery technology: %srechargeable\n",
531 (!battery->technology)?"non-":"");
532
533 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
534 seq_printf(seq, "design voltage: unknown\n");
535 else
536 seq_printf(seq, "design voltage: %d mV\n",
537 battery->design_voltage);
538 seq_printf(seq, "design capacity warning: %d %sh\n",
539 battery->design_capacity_warning,
540 acpi_battery_units(battery));
541 seq_printf(seq, "design capacity low: %d %sh\n",
542 battery->design_capacity_low,
543 acpi_battery_units(battery));
544 seq_printf(seq, "capacity granularity 1: %d %sh\n",
545 battery->capacity_granularity_1,
546 acpi_battery_units(battery));
547 seq_printf(seq, "capacity granularity 2: %d %sh\n",
548 battery->capacity_granularity_2,
549 acpi_battery_units(battery));
550 seq_printf(seq, "model number: %s\n", battery->model_number);
551 seq_printf(seq, "serial number: %s\n", battery->serial_number);
552 seq_printf(seq, "battery type: %s\n", battery->type);
553 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
554 end:
555 if (result)
556 seq_printf(seq, "ERROR: Unable to read battery info\n");
557 return result;
558 }
559
560 static int acpi_battery_print_state(struct seq_file *seq, int result)
561 {
562 struct acpi_battery *battery = seq->private;
563
564 if (result)
565 goto end;
566
567 seq_printf(seq, "present: %s\n",
568 acpi_battery_present(battery)?"yes":"no");
569 if (!acpi_battery_present(battery))
570 goto end;
571
572 seq_printf(seq, "capacity state: %s\n",
573 (battery->state & 0x04)?"critical":"ok");
574 if ((battery->state & 0x01) && (battery->state & 0x02))
575 seq_printf(seq,
576 "charging state: charging/discharging\n");
577 else if (battery->state & 0x01)
578 seq_printf(seq, "charging state: discharging\n");
579 else if (battery->state & 0x02)
580 seq_printf(seq, "charging state: charging\n");
581 else
582 seq_printf(seq, "charging state: charged\n");
583
584 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
585 seq_printf(seq, "present rate: unknown\n");
586 else
587 seq_printf(seq, "present rate: %d %s\n",
588 battery->current_now, acpi_battery_units(battery));
589
590 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
591 seq_printf(seq, "remaining capacity: unknown\n");
592 else
593 seq_printf(seq, "remaining capacity: %d %sh\n",
594 battery->capacity_now, acpi_battery_units(battery));
595 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
596 seq_printf(seq, "present voltage: unknown\n");
597 else
598 seq_printf(seq, "present voltage: %d mV\n",
599 battery->voltage_now);
600 end:
601 if (result)
602 seq_printf(seq, "ERROR: Unable to read battery state\n");
603
604 return result;
605 }
606
607 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
608 {
609 struct acpi_battery *battery = seq->private;
610
611 if (result)
612 goto end;
613
614 if (!acpi_battery_present(battery)) {
615 seq_printf(seq, "present: no\n");
616 goto end;
617 }
618 seq_printf(seq, "alarm: ");
619 if (!battery->alarm)
620 seq_printf(seq, "unsupported\n");
621 else
622 seq_printf(seq, "%u %sh\n", battery->alarm,
623 acpi_battery_units(battery));
624 end:
625 if (result)
626 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
627 return result;
628 }
629
630 static ssize_t acpi_battery_write_alarm(struct file *file,
631 const char __user * buffer,
632 size_t count, loff_t * ppos)
633 {
634 int result = 0;
635 char alarm_string[12] = { '\0' };
636 struct seq_file *m = file->private_data;
637 struct acpi_battery *battery = m->private;
638
639 if (!battery || (count > sizeof(alarm_string) - 1))
640 return -EINVAL;
641 if (!acpi_battery_present(battery)) {
642 result = -ENODEV;
643 goto end;
644 }
645 if (copy_from_user(alarm_string, buffer, count)) {
646 result = -EFAULT;
647 goto end;
648 }
649 alarm_string[count] = '\0';
650 battery->alarm = simple_strtol(alarm_string, NULL, 0);
651 result = acpi_battery_set_alarm(battery);
652 end:
653 if (!result)
654 return count;
655 return result;
656 }
657
658 typedef int(*print_func)(struct seq_file *seq, int result);
659
660 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
661 acpi_battery_print_info,
662 acpi_battery_print_state,
663 acpi_battery_print_alarm,
664 };
665
666 static int acpi_battery_read(int fid, struct seq_file *seq)
667 {
668 struct acpi_battery *battery = seq->private;
669 int result = acpi_battery_update(battery);
670 return acpi_print_funcs[fid](seq, result);
671 }
672
673 #define DECLARE_FILE_FUNCTIONS(_name) \
674 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
675 { \
676 return acpi_battery_read(_name##_tag, seq); \
677 } \
678 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
679 { \
680 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
681 }
682
683 DECLARE_FILE_FUNCTIONS(info);
684 DECLARE_FILE_FUNCTIONS(state);
685 DECLARE_FILE_FUNCTIONS(alarm);
686
687 #undef DECLARE_FILE_FUNCTIONS
688
689 #define FILE_DESCRIPTION_RO(_name) \
690 { \
691 .name = __stringify(_name), \
692 .mode = S_IRUGO, \
693 .ops = { \
694 .open = acpi_battery_##_name##_open_fs, \
695 .read = seq_read, \
696 .llseek = seq_lseek, \
697 .release = single_release, \
698 .owner = THIS_MODULE, \
699 }, \
700 }
701
702 #define FILE_DESCRIPTION_RW(_name) \
703 { \
704 .name = __stringify(_name), \
705 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
706 .ops = { \
707 .open = acpi_battery_##_name##_open_fs, \
708 .read = seq_read, \
709 .llseek = seq_lseek, \
710 .write = acpi_battery_write_##_name, \
711 .release = single_release, \
712 .owner = THIS_MODULE, \
713 }, \
714 }
715
716 static struct battery_file {
717 struct file_operations ops;
718 mode_t mode;
719 char *name;
720 } acpi_battery_file[] = {
721 FILE_DESCRIPTION_RO(info),
722 FILE_DESCRIPTION_RO(state),
723 FILE_DESCRIPTION_RW(alarm),
724 };
725
726 #undef FILE_DESCRIPTION_RO
727 #undef FILE_DESCRIPTION_RW
728
729 static int acpi_battery_add_fs(struct acpi_device *device)
730 {
731 struct proc_dir_entry *entry = NULL;
732 int i;
733
734 if (!acpi_device_dir(device)) {
735 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
736 acpi_battery_dir);
737 if (!acpi_device_dir(device))
738 return -ENODEV;
739 acpi_device_dir(device)->owner = THIS_MODULE;
740 }
741
742 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
743 entry = proc_create_data(acpi_battery_file[i].name,
744 acpi_battery_file[i].mode,
745 acpi_device_dir(device),
746 &acpi_battery_file[i].ops,
747 acpi_driver_data(device));
748 if (!entry)
749 return -ENODEV;
750 }
751 return 0;
752 }
753
754 static void acpi_battery_remove_fs(struct acpi_device *device)
755 {
756 int i;
757 if (!acpi_device_dir(device))
758 return;
759 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
760 remove_proc_entry(acpi_battery_file[i].name,
761 acpi_device_dir(device));
762
763 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
764 acpi_device_dir(device) = NULL;
765 }
766
767 #endif
768
769 /* --------------------------------------------------------------------------
770 Driver Interface
771 -------------------------------------------------------------------------- */
772
773 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
774 {
775 struct acpi_battery *battery = data;
776 struct acpi_device *device;
777 if (!battery)
778 return;
779 device = battery->device;
780 acpi_battery_update(battery);
781 acpi_bus_generate_proc_event(device, event,
782 acpi_battery_present(battery));
783 acpi_bus_generate_netlink_event(device->pnp.device_class,
784 dev_name(&device->dev), event,
785 acpi_battery_present(battery));
786 #ifdef CONFIG_ACPI_SYSFS_POWER
787 /* acpi_batter_update could remove power_supply object */
788 if (battery->bat.dev)
789 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
790 #endif
791 }
792
793 static int acpi_battery_add(struct acpi_device *device)
794 {
795 int result = 0;
796 acpi_status status = 0;
797 struct acpi_battery *battery = NULL;
798 if (!device)
799 return -EINVAL;
800 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
801 if (!battery)
802 return -ENOMEM;
803 battery->device = device;
804 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
805 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
806 device->driver_data = battery;
807 mutex_init(&battery->lock);
808 acpi_battery_update(battery);
809 #ifdef CONFIG_ACPI_PROCFS_POWER
810 result = acpi_battery_add_fs(device);
811 if (result)
812 goto end;
813 #endif
814 status = acpi_install_notify_handler(device->handle,
815 ACPI_ALL_NOTIFY,
816 acpi_battery_notify, battery);
817 if (ACPI_FAILURE(status)) {
818 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
819 result = -ENODEV;
820 goto end;
821 }
822 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
823 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
824 device->status.battery_present ? "present" : "absent");
825 end:
826 if (result) {
827 #ifdef CONFIG_ACPI_PROCFS_POWER
828 acpi_battery_remove_fs(device);
829 #endif
830 kfree(battery);
831 }
832 return result;
833 }
834
835 static int acpi_battery_remove(struct acpi_device *device, int type)
836 {
837 acpi_status status = 0;
838 struct acpi_battery *battery = NULL;
839
840 if (!device || !acpi_driver_data(device))
841 return -EINVAL;
842 battery = acpi_driver_data(device);
843 status = acpi_remove_notify_handler(device->handle,
844 ACPI_ALL_NOTIFY,
845 acpi_battery_notify);
846 #ifdef CONFIG_ACPI_PROCFS_POWER
847 acpi_battery_remove_fs(device);
848 #endif
849 #ifdef CONFIG_ACPI_SYSFS_POWER
850 sysfs_remove_battery(battery);
851 #endif
852 mutex_destroy(&battery->lock);
853 kfree(battery);
854 return 0;
855 }
856
857 /* this is needed to learn about changes made in suspended state */
858 static int acpi_battery_resume(struct acpi_device *device)
859 {
860 struct acpi_battery *battery;
861 if (!device)
862 return -EINVAL;
863 battery = acpi_driver_data(device);
864 battery->update_time = 0;
865 acpi_battery_update(battery);
866 return 0;
867 }
868
869 static struct acpi_driver acpi_battery_driver = {
870 .name = "battery",
871 .class = ACPI_BATTERY_CLASS,
872 .ids = battery_device_ids,
873 .ops = {
874 .add = acpi_battery_add,
875 .resume = acpi_battery_resume,
876 .remove = acpi_battery_remove,
877 },
878 };
879
880 static int __init acpi_battery_init(void)
881 {
882 if (acpi_disabled)
883 return -ENODEV;
884 #ifdef CONFIG_ACPI_PROCFS_POWER
885 acpi_battery_dir = acpi_lock_battery_dir();
886 if (!acpi_battery_dir)
887 return -ENODEV;
888 #endif
889 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
890 #ifdef CONFIG_ACPI_PROCFS_POWER
891 acpi_unlock_battery_dir(acpi_battery_dir);
892 #endif
893 return -ENODEV;
894 }
895 return 0;
896 }
897
898 static void __exit acpi_battery_exit(void)
899 {
900 acpi_bus_unregister_driver(&acpi_battery_driver);
901 #ifdef CONFIG_ACPI_PROCFS_POWER
902 acpi_unlock_battery_dir(acpi_battery_dir);
903 #endif
904 }
905
906 module_init(acpi_battery_init);
907 module_exit(acpi_battery_exit);