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fix struct user_info export's sysfs interaction
[linux-2.6/lfs.git] / drivers / acpi / battery.c
blobc4a769d1ba8542bf0210f71eb6930641c9062a2f
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_COMPONENT 0x00040000
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
57 ACPI_MODULE_NAME("battery");
58
59 MODULE_AUTHOR("Paul Diefenbaugh");
60 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
61 MODULE_DESCRIPTION("ACPI Battery Driver");
62 MODULE_LICENSE("GPL");
63
64 static unsigned int cache_time = 1000;
65 module_param(cache_time, uint, 0644);
66 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
67
68 #ifdef CONFIG_ACPI_PROCFS_POWER
69 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
70 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
71
72 enum acpi_battery_files {
73 info_tag = 0,
74 state_tag,
75 alarm_tag,
76 ACPI_BATTERY_NUMFILES,
77 };
78
79 #endif
80
81 static const struct acpi_device_id battery_device_ids[] = {
82 {"PNP0C0A", 0},
83 {"", 0},
84 };
85
86 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
87
88
89 struct 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 current_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
119 inline int acpi_battery_present(struct acpi_battery *battery)
120 {
121 return battery->device->status.battery_present;
122 }
123
124 #ifdef CONFIG_ACPI_SYSFS_POWER
125 static 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
140 static int acpi_battery_get_state(struct acpi_battery *battery);
141
142 static int acpi_battery_get_property(struct power_supply *psy,
143 enum power_supply_property psp,
144 union power_supply_propval *val)
145 {
146 struct acpi_battery *battery = to_acpi_battery(psy);
147
148 if (acpi_battery_present(battery)) {
149 /* run battery update only if it is present */
150 acpi_battery_get_state(battery);
151 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
152 return -ENODEV;
153 switch (psp) {
154 case POWER_SUPPLY_PROP_STATUS:
155 if (battery->state & 0x01)
156 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
157 else if (battery->state & 0x02)
158 val->intval = POWER_SUPPLY_STATUS_CHARGING;
159 else if (battery->state == 0)
160 val->intval = POWER_SUPPLY_STATUS_FULL;
161 else
162 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
163 break;
164 case POWER_SUPPLY_PROP_PRESENT:
165 val->intval = acpi_battery_present(battery);
166 break;
167 case POWER_SUPPLY_PROP_TECHNOLOGY:
168 val->intval = acpi_battery_technology(battery);
169 break;
170 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
171 val->intval = battery->design_voltage * 1000;
172 break;
173 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
174 val->intval = battery->voltage_now * 1000;
175 break;
176 case POWER_SUPPLY_PROP_CURRENT_NOW:
177 val->intval = battery->current_now * 1000;
178 break;
179 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
180 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
181 val->intval = battery->design_capacity * 1000;
182 break;
183 case POWER_SUPPLY_PROP_CHARGE_FULL:
184 case POWER_SUPPLY_PROP_ENERGY_FULL:
185 val->intval = battery->full_charge_capacity * 1000;
186 break;
187 case POWER_SUPPLY_PROP_CHARGE_NOW:
188 case POWER_SUPPLY_PROP_ENERGY_NOW:
189 val->intval = battery->capacity_now * 1000;
190 break;
191 case POWER_SUPPLY_PROP_MODEL_NAME:
192 val->strval = battery->model_number;
193 break;
194 case POWER_SUPPLY_PROP_MANUFACTURER:
195 val->strval = battery->oem_info;
196 break;
197 default:
198 return -EINVAL;
199 }
200 return 0;
201 }
202
203 static enum power_supply_property charge_battery_props[] = {
204 POWER_SUPPLY_PROP_STATUS,
205 POWER_SUPPLY_PROP_PRESENT,
206 POWER_SUPPLY_PROP_TECHNOLOGY,
207 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
208 POWER_SUPPLY_PROP_VOLTAGE_NOW,
209 POWER_SUPPLY_PROP_CURRENT_NOW,
210 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
211 POWER_SUPPLY_PROP_CHARGE_FULL,
212 POWER_SUPPLY_PROP_CHARGE_NOW,
213 POWER_SUPPLY_PROP_MODEL_NAME,
214 POWER_SUPPLY_PROP_MANUFACTURER,
215 };
216
217 static enum power_supply_property energy_battery_props[] = {
218 POWER_SUPPLY_PROP_STATUS,
219 POWER_SUPPLY_PROP_PRESENT,
220 POWER_SUPPLY_PROP_TECHNOLOGY,
221 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
222 POWER_SUPPLY_PROP_VOLTAGE_NOW,
223 POWER_SUPPLY_PROP_CURRENT_NOW,
224 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
225 POWER_SUPPLY_PROP_ENERGY_FULL,
226 POWER_SUPPLY_PROP_ENERGY_NOW,
227 POWER_SUPPLY_PROP_MODEL_NAME,
228 POWER_SUPPLY_PROP_MANUFACTURER,
229 };
230 #endif
231
232 #ifdef CONFIG_ACPI_PROCFS_POWER
233 inline char *acpi_battery_units(struct acpi_battery *battery)
234 {
235 return (battery->power_unit)?"mA":"mW";
236 }
237 #endif
238
239 /* --------------------------------------------------------------------------
240 Battery Management
241 -------------------------------------------------------------------------- */
242 struct acpi_offsets {
243 size_t offset; /* offset inside struct acpi_sbs_battery */
244 u8 mode; /* int or string? */
245 };
246
247 static struct acpi_offsets state_offsets[] = {
248 {offsetof(struct acpi_battery, state), 0},
249 {offsetof(struct acpi_battery, current_now), 0},
250 {offsetof(struct acpi_battery, capacity_now), 0},
251 {offsetof(struct acpi_battery, voltage_now), 0},
252 };
253
254 static struct acpi_offsets info_offsets[] = {
255 {offsetof(struct acpi_battery, power_unit), 0},
256 {offsetof(struct acpi_battery, design_capacity), 0},
257 {offsetof(struct acpi_battery, full_charge_capacity), 0},
258 {offsetof(struct acpi_battery, technology), 0},
259 {offsetof(struct acpi_battery, design_voltage), 0},
260 {offsetof(struct acpi_battery, design_capacity_warning), 0},
261 {offsetof(struct acpi_battery, design_capacity_low), 0},
262 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
263 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
264 {offsetof(struct acpi_battery, model_number), 1},
265 {offsetof(struct acpi_battery, serial_number), 1},
266 {offsetof(struct acpi_battery, type), 1},
267 {offsetof(struct acpi_battery, oem_info), 1},
268 };
269
270 static int extract_package(struct acpi_battery *battery,
271 union acpi_object *package,
272 struct acpi_offsets *offsets, int num)
273 {
274 int i;
275 union acpi_object *element;
276 if (package->type != ACPI_TYPE_PACKAGE)
277 return -EFAULT;
278 for (i = 0; i < num; ++i) {
279 if (package->package.count <= i)
280 return -EFAULT;
281 element = &package->package.elements[i];
282 if (offsets[i].mode) {
283 u8 *ptr = (u8 *)battery + offsets[i].offset;
284 if (element->type == ACPI_TYPE_STRING ||
285 element->type == ACPI_TYPE_BUFFER)
286 strncpy(ptr, element->string.pointer, 32);
287 else if (element->type == ACPI_TYPE_INTEGER) {
288 strncpy(ptr, (u8 *)&element->integer.value,
289 sizeof(acpi_integer));
290 ptr[sizeof(acpi_integer)] = 0;
291 } else return -EFAULT;
292 } else {
293 if (element->type == ACPI_TYPE_INTEGER) {
294 int *x = (int *)((u8 *)battery +
295 offsets[i].offset);
296 *x = element->integer.value;
297 } else return -EFAULT;
298 }
299 }
300 return 0;
301 }
302
303 static int acpi_battery_get_status(struct acpi_battery *battery)
304 {
305 if (acpi_bus_get_status(battery->device)) {
306 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
307 return -ENODEV;
308 }
309 return 0;
310 }
311
312 static int acpi_battery_get_info(struct acpi_battery *battery)
313 {
314 int result = -EFAULT;
315 acpi_status status = 0;
316 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
317
318 if (!acpi_battery_present(battery))
319 return 0;
320 mutex_lock(&battery->lock);
321 status = acpi_evaluate_object(battery->device->handle, "_BIF",
322 NULL, &buffer);
323 mutex_unlock(&battery->lock);
324
325 if (ACPI_FAILURE(status)) {
326 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
327 return -ENODEV;
328 }
329
330 result = extract_package(battery, buffer.pointer,
331 info_offsets, ARRAY_SIZE(info_offsets));
332 kfree(buffer.pointer);
333 return result;
334 }
335
336 static int acpi_battery_get_state(struct acpi_battery *battery)
337 {
338 int result = 0;
339 acpi_status status = 0;
340 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
341
342 if (!acpi_battery_present(battery))
343 return 0;
344
345 if (battery->update_time &&
346 time_before(jiffies, battery->update_time +
347 msecs_to_jiffies(cache_time)))
348 return 0;
349
350 mutex_lock(&battery->lock);
351 status = acpi_evaluate_object(battery->device->handle, "_BST",
352 NULL, &buffer);
353 mutex_unlock(&battery->lock);
354
355 if (ACPI_FAILURE(status)) {
356 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
357 return -ENODEV;
358 }
359
360 result = extract_package(battery, buffer.pointer,
361 state_offsets, ARRAY_SIZE(state_offsets));
362 battery->update_time = jiffies;
363 kfree(buffer.pointer);
364 return result;
365 }
366
367 static int acpi_battery_set_alarm(struct acpi_battery *battery)
368 {
369 acpi_status status = 0;
370 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
371 struct acpi_object_list arg_list = { 1, &arg0 };
372
373 if (!acpi_battery_present(battery)|| !battery->alarm_present)
374 return -ENODEV;
375
376 arg0.integer.value = battery->alarm;
377
378 mutex_lock(&battery->lock);
379 status = acpi_evaluate_object(battery->device->handle, "_BTP",
380 &arg_list, NULL);
381 mutex_unlock(&battery->lock);
382
383 if (ACPI_FAILURE(status))
384 return -ENODEV;
385
386 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
387 return 0;
388 }
389
390 static int acpi_battery_init_alarm(struct acpi_battery *battery)
391 {
392 acpi_status status = AE_OK;
393 acpi_handle handle = NULL;
394
395 /* See if alarms are supported, and if so, set default */
396 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
397 if (ACPI_FAILURE(status)) {
398 battery->alarm_present = 0;
399 return 0;
400 }
401 battery->alarm_present = 1;
402 if (!battery->alarm)
403 battery->alarm = battery->design_capacity_warning;
404 return acpi_battery_set_alarm(battery);
405 }
406
407 #ifdef CONFIG_ACPI_SYSFS_POWER
408 static ssize_t acpi_battery_alarm_show(struct device *dev,
409 struct device_attribute *attr,
410 char *buf)
411 {
412 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
413 return sprintf(buf, "%d\n", battery->alarm * 1000);
414 }
415
416 static ssize_t acpi_battery_alarm_store(struct device *dev,
417 struct device_attribute *attr,
418 const char *buf, size_t count)
419 {
420 unsigned long x;
421 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
422 if (sscanf(buf, "%ld\n", &x) == 1)
423 battery->alarm = x/1000;
424 if (acpi_battery_present(battery))
425 acpi_battery_set_alarm(battery);
426 return count;
427 }
428
429 static struct device_attribute alarm_attr = {
430 .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
431 .show = acpi_battery_alarm_show,
432 .store = acpi_battery_alarm_store,
433 };
434
435 static int sysfs_add_battery(struct acpi_battery *battery)
436 {
437 int result;
438
439 if (battery->power_unit) {
440 battery->bat.properties = charge_battery_props;
441 battery->bat.num_properties =
442 ARRAY_SIZE(charge_battery_props);
443 } else {
444 battery->bat.properties = energy_battery_props;
445 battery->bat.num_properties =
446 ARRAY_SIZE(energy_battery_props);
447 }
448
449 battery->bat.name = acpi_device_bid(battery->device);
450 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
451 battery->bat.get_property = acpi_battery_get_property;
452
453 result = power_supply_register(&battery->device->dev, &battery->bat);
454 if (result)
455 return result;
456 return device_create_file(battery->bat.dev, &alarm_attr);
457 }
458
459 static void sysfs_remove_battery(struct acpi_battery *battery)
460 {
461 if (!battery->bat.dev)
462 return;
463 device_remove_file(battery->bat.dev, &alarm_attr);
464 power_supply_unregister(&battery->bat);
465 battery->bat.dev = NULL;
466 }
467 #endif
468
469 static int acpi_battery_update(struct acpi_battery *battery)
470 {
471 int result;
472 result = acpi_battery_get_status(battery);
473 if (result)
474 return result;
475 #ifdef CONFIG_ACPI_SYSFS_POWER
476 if (!acpi_battery_present(battery)) {
477 sysfs_remove_battery(battery);
478 battery->update_time = 0;
479 return 0;
480 }
481 #endif
482 if (!battery->update_time) {
483 result = acpi_battery_get_info(battery);
484 if (result)
485 return result;
486 acpi_battery_init_alarm(battery);
487 }
488 #ifdef CONFIG_ACPI_SYSFS_POWER
489 if (!battery->bat.dev)
490 sysfs_add_battery(battery);
491 #endif
492 return acpi_battery_get_state(battery);
493 }
494
495 /* --------------------------------------------------------------------------
496 FS Interface (/proc)
497 -------------------------------------------------------------------------- */
498
499 #ifdef CONFIG_ACPI_PROCFS_POWER
500 static struct proc_dir_entry *acpi_battery_dir;
501
502 static int acpi_battery_print_info(struct seq_file *seq, int result)
503 {
504 struct acpi_battery *battery = seq->private;
505
506 if (result)
507 goto end;
508
509 seq_printf(seq, "present: %s\n",
510 acpi_battery_present(battery)?"yes":"no");
511 if (!acpi_battery_present(battery))
512 goto end;
513 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
514 seq_printf(seq, "design capacity: unknown\n");
515 else
516 seq_printf(seq, "design capacity: %d %sh\n",
517 battery->design_capacity,
518 acpi_battery_units(battery));
519
520 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
521 seq_printf(seq, "last full capacity: unknown\n");
522 else
523 seq_printf(seq, "last full capacity: %d %sh\n",
524 battery->full_charge_capacity,
525 acpi_battery_units(battery));
526
527 seq_printf(seq, "battery technology: %srechargeable\n",
528 (!battery->technology)?"non-":"");
529
530 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
531 seq_printf(seq, "design voltage: unknown\n");
532 else
533 seq_printf(seq, "design voltage: %d mV\n",
534 battery->design_voltage);
535 seq_printf(seq, "design capacity warning: %d %sh\n",
536 battery->design_capacity_warning,
537 acpi_battery_units(battery));
538 seq_printf(seq, "design capacity low: %d %sh\n",
539 battery->design_capacity_low,
540 acpi_battery_units(battery));
541 seq_printf(seq, "capacity granularity 1: %d %sh\n",
542 battery->capacity_granularity_1,
543 acpi_battery_units(battery));
544 seq_printf(seq, "capacity granularity 2: %d %sh\n",
545 battery->capacity_granularity_2,
546 acpi_battery_units(battery));
547 seq_printf(seq, "model number: %s\n", battery->model_number);
548 seq_printf(seq, "serial number: %s\n", battery->serial_number);
549 seq_printf(seq, "battery type: %s\n", battery->type);
550 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
551 end:
552 if (result)
553 seq_printf(seq, "ERROR: Unable to read battery info\n");
554 return result;
555 }
556
557 static int acpi_battery_print_state(struct seq_file *seq, int result)
558 {
559 struct acpi_battery *battery = seq->private;
560
561 if (result)
562 goto end;
563
564 seq_printf(seq, "present: %s\n",
565 acpi_battery_present(battery)?"yes":"no");
566 if (!acpi_battery_present(battery))
567 goto end;
568
569 seq_printf(seq, "capacity state: %s\n",
570 (battery->state & 0x04)?"critical":"ok");
571 if ((battery->state & 0x01) && (battery->state & 0x02))
572 seq_printf(seq,
573 "charging state: charging/discharging\n");
574 else if (battery->state & 0x01)
575 seq_printf(seq, "charging state: discharging\n");
576 else if (battery->state & 0x02)
577 seq_printf(seq, "charging state: charging\n");
578 else
579 seq_printf(seq, "charging state: charged\n");
580
581 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
582 seq_printf(seq, "present rate: unknown\n");
583 else
584 seq_printf(seq, "present rate: %d %s\n",
585 battery->current_now, acpi_battery_units(battery));
586
587 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
588 seq_printf(seq, "remaining capacity: unknown\n");
589 else
590 seq_printf(seq, "remaining capacity: %d %sh\n",
591 battery->capacity_now, acpi_battery_units(battery));
592 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
593 seq_printf(seq, "present voltage: unknown\n");
594 else
595 seq_printf(seq, "present voltage: %d mV\n",
596 battery->voltage_now);
597 end:
598 if (result)
599 seq_printf(seq, "ERROR: Unable to read battery state\n");
600
601 return result;
602 }
603
604 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
605 {
606 struct acpi_battery *battery = seq->private;
607
608 if (result)
609 goto end;
610
611 if (!acpi_battery_present(battery)) {
612 seq_printf(seq, "present: no\n");
613 goto end;
614 }
615 seq_printf(seq, "alarm: ");
616 if (!battery->alarm)
617 seq_printf(seq, "unsupported\n");
618 else
619 seq_printf(seq, "%u %sh\n", battery->alarm,
620 acpi_battery_units(battery));
621 end:
622 if (result)
623 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
624 return result;
625 }
626
627 static ssize_t acpi_battery_write_alarm(struct file *file,
628 const char __user * buffer,
629 size_t count, loff_t * ppos)
630 {
631 int result = 0;
632 char alarm_string[12] = { '\0' };
633 struct seq_file *m = file->private_data;
634 struct acpi_battery *battery = m->private;
635
636 if (!battery || (count > sizeof(alarm_string) - 1))
637 return -EINVAL;
638 if (!acpi_battery_present(battery)) {
639 result = -ENODEV;
640 goto end;
641 }
642 if (copy_from_user(alarm_string, buffer, count)) {
643 result = -EFAULT;
644 goto end;
645 }
646 alarm_string[count] = '\0';
647 battery->alarm = simple_strtol(alarm_string, NULL, 0);
648 result = acpi_battery_set_alarm(battery);
649 end:
650 if (!result)
651 return count;
652 return result;
653 }
654
655 typedef int(*print_func)(struct seq_file *seq, int result);
656
657 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
658 acpi_battery_print_info,
659 acpi_battery_print_state,
660 acpi_battery_print_alarm,
661 };
662
663 static int acpi_battery_read(int fid, struct seq_file *seq)
664 {
665 struct acpi_battery *battery = seq->private;
666 int result = acpi_battery_update(battery);
667 return acpi_print_funcs[fid](seq, result);
668 }
669
670 #define DECLARE_FILE_FUNCTIONS(_name) \
671 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
672 { \
673 return acpi_battery_read(_name##_tag, seq); \
674 } \
675 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
676 { \
677 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
678 }
679
680 DECLARE_FILE_FUNCTIONS(info);
681 DECLARE_FILE_FUNCTIONS(state);
682 DECLARE_FILE_FUNCTIONS(alarm);
683
684 #undef DECLARE_FILE_FUNCTIONS
685
686 #define FILE_DESCRIPTION_RO(_name) \
687 { \
688 .name = __stringify(_name), \
689 .mode = S_IRUGO, \
690 .ops = { \
691 .open = acpi_battery_##_name##_open_fs, \
692 .read = seq_read, \
693 .llseek = seq_lseek, \
694 .release = single_release, \
695 .owner = THIS_MODULE, \
696 }, \
697 }
698
699 #define FILE_DESCRIPTION_RW(_name) \
700 { \
701 .name = __stringify(_name), \
702 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
703 .ops = { \
704 .open = acpi_battery_##_name##_open_fs, \
705 .read = seq_read, \
706 .llseek = seq_lseek, \
707 .write = acpi_battery_write_##_name, \
708 .release = single_release, \
709 .owner = THIS_MODULE, \
710 }, \
711 }
712
713 static struct battery_file {
714 struct file_operations ops;
715 mode_t mode;
716 char *name;
717 } acpi_battery_file[] = {
718 FILE_DESCRIPTION_RO(info),
719 FILE_DESCRIPTION_RO(state),
720 FILE_DESCRIPTION_RW(alarm),
721 };
722
723 #undef FILE_DESCRIPTION_RO
724 #undef FILE_DESCRIPTION_RW
725
726 static int acpi_battery_add_fs(struct acpi_device *device)
727 {
728 struct proc_dir_entry *entry = NULL;
729 int i;
730
731 if (!acpi_device_dir(device)) {
732 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
733 acpi_battery_dir);
734 if (!acpi_device_dir(device))
735 return -ENODEV;
736 acpi_device_dir(device)->owner = THIS_MODULE;
737 }
738
739 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
740 entry = create_proc_entry(acpi_battery_file[i].name,
741 acpi_battery_file[i].mode, acpi_device_dir(device));
742 if (!entry)
743 return -ENODEV;
744 else {
745 entry->proc_fops = &acpi_battery_file[i].ops;
746 entry->data = acpi_driver_data(device);
747 entry->owner = THIS_MODULE;
748 }
749 }
750 return 0;
751 }
752
753 static void acpi_battery_remove_fs(struct acpi_device *device)
754 {
755 int i;
756 if (!acpi_device_dir(device))
757 return;
758 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
759 remove_proc_entry(acpi_battery_file[i].name,
760 acpi_device_dir(device));
761
762 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
763 acpi_device_dir(device) = NULL;
764 }
765
766 #endif
767
768 /* --------------------------------------------------------------------------
769 Driver Interface
770 -------------------------------------------------------------------------- */
771
772 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
773 {
774 struct acpi_battery *battery = data;
775 struct acpi_device *device;
776 if (!battery)
777 return;
778 device = battery->device;
779 acpi_battery_update(battery);
780 acpi_bus_generate_proc_event(device, event,
781 acpi_battery_present(battery));
782 acpi_bus_generate_netlink_event(device->pnp.device_class,
783 device->dev.bus_id, event,
784 acpi_battery_present(battery));
785 #ifdef CONFIG_ACPI_SYSFS_POWER
786 /* acpi_batter_update could remove power_supply object */
787 if (battery->bat.dev)
788 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
789 #endif
790 }
791
792 static int acpi_battery_add(struct acpi_device *device)
793 {
794 int result = 0;
795 acpi_status status = 0;
796 struct acpi_battery *battery = NULL;
797 if (!device)
798 return -EINVAL;
799 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
800 if (!battery)
801 return -ENOMEM;
802 battery->device = device;
803 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
804 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
805 acpi_driver_data(device) = battery;
806 mutex_init(&battery->lock);
807 acpi_battery_update(battery);
808 #ifdef CONFIG_ACPI_PROCFS_POWER
809 result = acpi_battery_add_fs(device);
810 if (result)
811 goto end;
812 #endif
813 status = acpi_install_notify_handler(device->handle,
814 ACPI_ALL_NOTIFY,
815 acpi_battery_notify, battery);
816 if (ACPI_FAILURE(status)) {
817 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
818 result = -ENODEV;
819 goto end;
820 }
821 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
822 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
823 device->status.battery_present ? "present" : "absent");
824 end:
825 if (result) {
826 #ifdef CONFIG_ACPI_PROCFS_POWER
827 acpi_battery_remove_fs(device);
828 #endif
829 kfree(battery);
830 }
831 return result;
832 }
833
834 static int acpi_battery_remove(struct acpi_device *device, int type)
835 {
836 acpi_status status = 0;
837 struct acpi_battery *battery = NULL;
838
839 if (!device || !acpi_driver_data(device))
840 return -EINVAL;
841 battery = acpi_driver_data(device);
842 status = acpi_remove_notify_handler(device->handle,
843 ACPI_ALL_NOTIFY,
844 acpi_battery_notify);
845 #ifdef CONFIG_ACPI_PROCFS_POWER
846 acpi_battery_remove_fs(device);
847 #endif
848 #ifdef CONFIG_ACPI_SYSFS_POWER
849 sysfs_remove_battery(battery);
850 #endif
851 mutex_destroy(&battery->lock);
852 kfree(battery);
853 return 0;
854 }
855
856 /* this is needed to learn about changes made in suspended state */
857 static int acpi_battery_resume(struct acpi_device *device)
858 {
859 struct acpi_battery *battery;
860 if (!device)
861 return -EINVAL;
862 battery = acpi_driver_data(device);
863 battery->update_time = 0;
864 acpi_battery_update(battery);
865 return 0;
866 }
867
868 static struct acpi_driver acpi_battery_driver = {
869 .name = "battery",
870 .class = ACPI_BATTERY_CLASS,
871 .ids = battery_device_ids,
872 .ops = {
873 .add = acpi_battery_add,
874 .resume = acpi_battery_resume,
875 .remove = acpi_battery_remove,
876 },
877 };
878
879 static int __init acpi_battery_init(void)
880 {
881 if (acpi_disabled)
882 return -ENODEV;
883 #ifdef CONFIG_ACPI_PROCFS_POWER
884 acpi_battery_dir = acpi_lock_battery_dir();
885 if (!acpi_battery_dir)
886 return -ENODEV;
887 #endif
888 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
889 #ifdef CONFIG_ACPI_PROCFS_POWER
890 acpi_unlock_battery_dir(acpi_battery_dir);
891 #endif
892 return -ENODEV;
893 }
894 return 0;
895 }
896
897 static void __exit acpi_battery_exit(void)
898 {
899 acpi_bus_unregister_driver(&acpi_battery_driver);
900 #ifdef CONFIG_ACPI_PROCFS_POWER
901 acpi_unlock_battery_dir(acpi_battery_dir);
902 #endif
903 }
904
905 module_init(acpi_battery_init);
906 module_exit(acpi_battery_exit);
Log-structured file system for Linux