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[SCSI] qla1280: convert to use the data buffer accessors
[linux-2.6/verdex.git] / drivers / acpi / battery.c
blobc2ce0ad21693c0279adcc2b9529c00b77c4fc0ff
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
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 #include <linux/power_supply.h>
44
45 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
46
47 #define ACPI_BATTERY_COMPONENT 0x00040000
48 #define ACPI_BATTERY_CLASS "battery"
49 #define ACPI_BATTERY_DEVICE_NAME "Battery"
50 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
51 #define ACPI_BATTERY_NOTIFY_INFO 0x81
52
53 #define _COMPONENT ACPI_BATTERY_COMPONENT
54
55 ACPI_MODULE_NAME("battery");
56
57 MODULE_AUTHOR("Paul Diefenbaugh");
58 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
59 MODULE_DESCRIPTION("ACPI Battery Driver");
60 MODULE_LICENSE("GPL");
61
62 static unsigned int cache_time = 1000;
63 module_param(cache_time, uint, 0644);
64 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
65
66 #ifdef CONFIG_ACPI_PROCFS
67 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
68 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
69
70 enum acpi_battery_files {
71 info_tag = 0,
72 state_tag,
73 alarm_tag,
74 ACPI_BATTERY_NUMFILES,
75 };
76
77 #endif
78
79 static const struct acpi_device_id battery_device_ids[] = {
80 {"PNP0C0A", 0},
81 {"", 0},
82 };
83
84 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
85
86
87 struct acpi_battery {
88 struct mutex lock;
89 struct power_supply bat;
90 struct acpi_device *device;
91 unsigned long update_time;
92 int current_now;
93 int capacity_now;
94 int voltage_now;
95 int design_capacity;
96 int full_charge_capacity;
97 int technology;
98 int design_voltage;
99 int design_capacity_warning;
100 int design_capacity_low;
101 int capacity_granularity_1;
102 int capacity_granularity_2;
103 int alarm;
104 char model_number[32];
105 char serial_number[32];
106 char type[32];
107 char oem_info[32];
108 int state;
109 int power_unit;
110 u8 alarm_present;
111 };
112
113 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
114
115 inline int acpi_battery_present(struct acpi_battery *battery)
116 {
117 return battery->device->status.battery_present;
118 }
119
120 static int acpi_battery_technology(struct acpi_battery *battery)
121 {
122 if (!strcasecmp("NiCd", battery->type))
123 return POWER_SUPPLY_TECHNOLOGY_NiCd;
124 if (!strcasecmp("NiMH", battery->type))
125 return POWER_SUPPLY_TECHNOLOGY_NiMH;
126 if (!strcasecmp("LION", battery->type))
127 return POWER_SUPPLY_TECHNOLOGY_LION;
128 if (!strcasecmp("LI-ION", battery->type))
129 return POWER_SUPPLY_TECHNOLOGY_LION;
130 if (!strcasecmp("LiP", battery->type))
131 return POWER_SUPPLY_TECHNOLOGY_LIPO;
132 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
133 }
134
135 static int acpi_battery_update(struct acpi_battery *battery);
136
137 static int acpi_battery_get_property(struct power_supply *psy,
138 enum power_supply_property psp,
139 union power_supply_propval *val)
140 {
141 struct acpi_battery *battery = to_acpi_battery(psy);
142
143 if ((!acpi_battery_present(battery)) &&
144 psp != POWER_SUPPLY_PROP_PRESENT)
145 return -ENODEV;
146 acpi_battery_update(battery);
147 switch (psp) {
148 case POWER_SUPPLY_PROP_STATUS:
149 if (battery->state & 0x01)
150 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
151 else if (battery->state & 0x02)
152 val->intval = POWER_SUPPLY_STATUS_CHARGING;
153 else if (battery->state == 0)
154 val->intval = POWER_SUPPLY_STATUS_FULL;
155 break;
156 case POWER_SUPPLY_PROP_PRESENT:
157 val->intval = acpi_battery_present(battery);
158 break;
159 case POWER_SUPPLY_PROP_TECHNOLOGY:
160 val->intval = acpi_battery_technology(battery);
161 break;
162 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
163 val->intval = battery->design_voltage * 1000;
164 break;
165 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
166 val->intval = battery->voltage_now * 1000;
167 break;
168 case POWER_SUPPLY_PROP_CURRENT_NOW:
169 val->intval = battery->current_now * 1000;
170 break;
171 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
172 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
173 val->intval = battery->design_capacity * 1000;
174 break;
175 case POWER_SUPPLY_PROP_CHARGE_FULL:
176 case POWER_SUPPLY_PROP_ENERGY_FULL:
177 val->intval = battery->full_charge_capacity * 1000;
178 break;
179 case POWER_SUPPLY_PROP_CHARGE_NOW:
180 case POWER_SUPPLY_PROP_ENERGY_NOW:
181 val->intval = battery->capacity_now * 1000;
182 break;
183 case POWER_SUPPLY_PROP_MODEL_NAME:
184 val->strval = battery->model_number;
185 break;
186 case POWER_SUPPLY_PROP_MANUFACTURER:
187 val->strval = battery->oem_info;
188 break;
189 default:
190 return -EINVAL;
191 }
192 return 0;
193 }
194
195 static enum power_supply_property charge_battery_props[] = {
196 POWER_SUPPLY_PROP_STATUS,
197 POWER_SUPPLY_PROP_PRESENT,
198 POWER_SUPPLY_PROP_TECHNOLOGY,
199 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
200 POWER_SUPPLY_PROP_VOLTAGE_NOW,
201 POWER_SUPPLY_PROP_CURRENT_NOW,
202 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
203 POWER_SUPPLY_PROP_CHARGE_FULL,
204 POWER_SUPPLY_PROP_CHARGE_NOW,
205 POWER_SUPPLY_PROP_MODEL_NAME,
206 POWER_SUPPLY_PROP_MANUFACTURER,
207 };
208
209 static enum power_supply_property energy_battery_props[] = {
210 POWER_SUPPLY_PROP_STATUS,
211 POWER_SUPPLY_PROP_PRESENT,
212 POWER_SUPPLY_PROP_TECHNOLOGY,
213 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
214 POWER_SUPPLY_PROP_VOLTAGE_NOW,
215 POWER_SUPPLY_PROP_CURRENT_NOW,
216 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
217 POWER_SUPPLY_PROP_ENERGY_FULL,
218 POWER_SUPPLY_PROP_ENERGY_NOW,
219 POWER_SUPPLY_PROP_MODEL_NAME,
220 POWER_SUPPLY_PROP_MANUFACTURER,
221 };
222
223 #ifdef CONFIG_ACPI_PROCFS
224 inline char *acpi_battery_units(struct acpi_battery *battery)
225 {
226 return (battery->power_unit)?"mA":"mW";
227 }
228 #endif
229
230 /* --------------------------------------------------------------------------
231 Battery Management
232 -------------------------------------------------------------------------- */
233 struct acpi_offsets {
234 size_t offset; /* offset inside struct acpi_sbs_battery */
235 u8 mode; /* int or string? */
236 };
237
238 static struct acpi_offsets state_offsets[] = {
239 {offsetof(struct acpi_battery, state), 0},
240 {offsetof(struct acpi_battery, current_now), 0},
241 {offsetof(struct acpi_battery, capacity_now), 0},
242 {offsetof(struct acpi_battery, voltage_now), 0},
243 };
244
245 static struct acpi_offsets info_offsets[] = {
246 {offsetof(struct acpi_battery, power_unit), 0},
247 {offsetof(struct acpi_battery, design_capacity), 0},
248 {offsetof(struct acpi_battery, full_charge_capacity), 0},
249 {offsetof(struct acpi_battery, technology), 0},
250 {offsetof(struct acpi_battery, design_voltage), 0},
251 {offsetof(struct acpi_battery, design_capacity_warning), 0},
252 {offsetof(struct acpi_battery, design_capacity_low), 0},
253 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
254 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
255 {offsetof(struct acpi_battery, model_number), 1},
256 {offsetof(struct acpi_battery, serial_number), 1},
257 {offsetof(struct acpi_battery, type), 1},
258 {offsetof(struct acpi_battery, oem_info), 1},
259 };
260
261 static int extract_package(struct acpi_battery *battery,
262 union acpi_object *package,
263 struct acpi_offsets *offsets, int num)
264 {
265 int i;
266 union acpi_object *element;
267 if (package->type != ACPI_TYPE_PACKAGE)
268 return -EFAULT;
269 for (i = 0; i < num; ++i) {
270 if (package->package.count <= i)
271 return -EFAULT;
272 element = &package->package.elements[i];
273 if (offsets[i].mode) {
274 u8 *ptr = (u8 *)battery + offsets[i].offset;
275 if (element->type == ACPI_TYPE_STRING ||
276 element->type == ACPI_TYPE_BUFFER)
277 strncpy(ptr, element->string.pointer, 32);
278 else if (element->type == ACPI_TYPE_INTEGER) {
279 strncpy(ptr, (u8 *)&element->integer.value,
280 sizeof(acpi_integer));
281 ptr[sizeof(acpi_integer)] = 0;
282 } else return -EFAULT;
283 } else {
284 if (element->type == ACPI_TYPE_INTEGER) {
285 int *x = (int *)((u8 *)battery +
286 offsets[i].offset);
287 *x = element->integer.value;
288 } else return -EFAULT;
289 }
290 }
291 return 0;
292 }
293
294 static int acpi_battery_get_status(struct acpi_battery *battery)
295 {
296 if (acpi_bus_get_status(battery->device)) {
297 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
298 return -ENODEV;
299 }
300 return 0;
301 }
302
303 static int acpi_battery_get_info(struct acpi_battery *battery)
304 {
305 int result = -EFAULT;
306 acpi_status status = 0;
307 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
308
309 if (!acpi_battery_present(battery))
310 return 0;
311 mutex_lock(&battery->lock);
312 status = acpi_evaluate_object(battery->device->handle, "_BIF",
313 NULL, &buffer);
314 mutex_unlock(&battery->lock);
315
316 if (ACPI_FAILURE(status)) {
317 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
318 return -ENODEV;
319 }
320
321 result = extract_package(battery, buffer.pointer,
322 info_offsets, ARRAY_SIZE(info_offsets));
323 kfree(buffer.pointer);
324 return result;
325 }
326
327 static int acpi_battery_get_state(struct acpi_battery *battery)
328 {
329 int result = 0;
330 acpi_status status = 0;
331 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
332
333 if (!acpi_battery_present(battery))
334 return 0;
335
336 if (battery->update_time &&
337 time_before(jiffies, battery->update_time +
338 msecs_to_jiffies(cache_time)))
339 return 0;
340
341 mutex_lock(&battery->lock);
342 status = acpi_evaluate_object(battery->device->handle, "_BST",
343 NULL, &buffer);
344 mutex_unlock(&battery->lock);
345
346 if (ACPI_FAILURE(status)) {
347 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
348 return -ENODEV;
349 }
350
351 result = extract_package(battery, buffer.pointer,
352 state_offsets, ARRAY_SIZE(state_offsets));
353 battery->update_time = jiffies;
354 kfree(buffer.pointer);
355 return result;
356 }
357
358 static int acpi_battery_set_alarm(struct acpi_battery *battery)
359 {
360 acpi_status status = 0;
361 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
362 struct acpi_object_list arg_list = { 1, &arg0 };
363
364 if (!acpi_battery_present(battery)|| !battery->alarm_present)
365 return -ENODEV;
366
367 arg0.integer.value = battery->alarm;
368
369 mutex_lock(&battery->lock);
370 status = acpi_evaluate_object(battery->device->handle, "_BTP",
371 &arg_list, NULL);
372 mutex_unlock(&battery->lock);
373
374 if (ACPI_FAILURE(status))
375 return -ENODEV;
376
377 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
378 return 0;
379 }
380
381 static int acpi_battery_init_alarm(struct acpi_battery *battery)
382 {
383 acpi_status status = AE_OK;
384 acpi_handle handle = NULL;
385
386 /* See if alarms are supported, and if so, set default */
387 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
388 if (ACPI_FAILURE(status)) {
389 battery->alarm_present = 0;
390 return 0;
391 }
392 battery->alarm_present = 1;
393 if (!battery->alarm)
394 battery->alarm = battery->design_capacity_warning;
395 return acpi_battery_set_alarm(battery);
396 }
397
398 static ssize_t acpi_battery_alarm_show(struct device *dev,
399 struct device_attribute *attr,
400 char *buf)
401 {
402 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
403 return sprintf(buf, "%d\n", battery->alarm * 1000);
404 }
405
406 static ssize_t acpi_battery_alarm_store(struct device *dev,
407 struct device_attribute *attr,
408 const char *buf, size_t count)
409 {
410 unsigned long x;
411 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
412 if (sscanf(buf, "%ld\n", &x) == 1)
413 battery->alarm = x/1000;
414 if (acpi_battery_present(battery))
415 acpi_battery_set_alarm(battery);
416 return count;
417 }
418
419 static struct device_attribute alarm_attr = {
420 .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
421 .show = acpi_battery_alarm_show,
422 .store = acpi_battery_alarm_store,
423 };
424
425 static int sysfs_add_battery(struct acpi_battery *battery)
426 {
427 int result;
428
429 battery->update_time = 0;
430 result = acpi_battery_get_info(battery);
431 acpi_battery_init_alarm(battery);
432 if (result)
433 return result;
434 if (battery->power_unit) {
435 battery->bat.properties = charge_battery_props;
436 battery->bat.num_properties =
437 ARRAY_SIZE(charge_battery_props);
438 } else {
439 battery->bat.properties = energy_battery_props;
440 battery->bat.num_properties =
441 ARRAY_SIZE(energy_battery_props);
442 }
443
444 battery->bat.name = acpi_device_bid(battery->device);
445 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
446 battery->bat.get_property = acpi_battery_get_property;
447
448 result = power_supply_register(&battery->device->dev, &battery->bat);
449 if (result)
450 return result;
451 return device_create_file(battery->bat.dev, &alarm_attr);
452 }
453
454 static void sysfs_remove_battery(struct acpi_battery *battery)
455 {
456 if (!battery->bat.dev)
457 return;
458 device_remove_file(battery->bat.dev, &alarm_attr);
459 power_supply_unregister(&battery->bat);
460 }
461
462 static int acpi_battery_update(struct acpi_battery *battery)
463 {
464 int result = acpi_battery_get_status(battery);
465 if (result)
466 return result;
467 if (!acpi_battery_present(battery)) {
468 sysfs_remove_battery(battery);
469 return 0;
470 }
471 if (!battery->bat.dev)
472 sysfs_add_battery(battery);
473 return acpi_battery_get_state(battery);
474 }
475
476 /* --------------------------------------------------------------------------
477 FS Interface (/proc)
478 -------------------------------------------------------------------------- */
479
480 #ifdef CONFIG_ACPI_PROCFS
481 static struct proc_dir_entry *acpi_battery_dir;
482
483 static int acpi_battery_print_info(struct seq_file *seq, int result)
484 {
485 struct acpi_battery *battery = seq->private;
486
487 if (result)
488 goto end;
489
490 seq_printf(seq, "present: %s\n",
491 acpi_battery_present(battery)?"yes":"no");
492 if (!acpi_battery_present(battery))
493 goto end;
494 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
495 seq_printf(seq, "design capacity: unknown\n");
496 else
497 seq_printf(seq, "design capacity: %d %sh\n",
498 battery->design_capacity,
499 acpi_battery_units(battery));
500
501 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
502 seq_printf(seq, "last full capacity: unknown\n");
503 else
504 seq_printf(seq, "last full capacity: %d %sh\n",
505 battery->full_charge_capacity,
506 acpi_battery_units(battery));
507
508 seq_printf(seq, "battery technology: %srechargeable\n",
509 (!battery->technology)?"non-":"");
510
511 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
512 seq_printf(seq, "design voltage: unknown\n");
513 else
514 seq_printf(seq, "design voltage: %d mV\n",
515 battery->design_voltage);
516 seq_printf(seq, "design capacity warning: %d %sh\n",
517 battery->design_capacity_warning,
518 acpi_battery_units(battery));
519 seq_printf(seq, "design capacity low: %d %sh\n",
520 battery->design_capacity_low,
521 acpi_battery_units(battery));
522 seq_printf(seq, "capacity granularity 1: %d %sh\n",
523 battery->capacity_granularity_1,
524 acpi_battery_units(battery));
525 seq_printf(seq, "capacity granularity 2: %d %sh\n",
526 battery->capacity_granularity_2,
527 acpi_battery_units(battery));
528 seq_printf(seq, "model number: %s\n", battery->model_number);
529 seq_printf(seq, "serial number: %s\n", battery->serial_number);
530 seq_printf(seq, "battery type: %s\n", battery->type);
531 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
532 end:
533 if (result)
534 seq_printf(seq, "ERROR: Unable to read battery info\n");
535 return result;
536 }
537
538 static int acpi_battery_print_state(struct seq_file *seq, int result)
539 {
540 struct acpi_battery *battery = seq->private;
541
542 if (result)
543 goto end;
544
545 seq_printf(seq, "present: %s\n",
546 acpi_battery_present(battery)?"yes":"no");
547 if (!acpi_battery_present(battery))
548 goto end;
549
550 seq_printf(seq, "capacity state: %s\n",
551 (battery->state & 0x04)?"critical":"ok");
552 if ((battery->state & 0x01) && (battery->state & 0x02))
553 seq_printf(seq,
554 "charging state: charging/discharging\n");
555 else if (battery->state & 0x01)
556 seq_printf(seq, "charging state: discharging\n");
557 else if (battery->state & 0x02)
558 seq_printf(seq, "charging state: charging\n");
559 else
560 seq_printf(seq, "charging state: charged\n");
561
562 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
563 seq_printf(seq, "present rate: unknown\n");
564 else
565 seq_printf(seq, "present rate: %d %s\n",
566 battery->current_now, acpi_battery_units(battery));
567
568 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
569 seq_printf(seq, "remaining capacity: unknown\n");
570 else
571 seq_printf(seq, "remaining capacity: %d %sh\n",
572 battery->capacity_now, acpi_battery_units(battery));
573 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
574 seq_printf(seq, "present voltage: unknown\n");
575 else
576 seq_printf(seq, "present voltage: %d mV\n",
577 battery->voltage_now);
578 end:
579 if (result)
580 seq_printf(seq, "ERROR: Unable to read battery state\n");
581
582 return result;
583 }
584
585 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
586 {
587 struct acpi_battery *battery = seq->private;
588
589 if (result)
590 goto end;
591
592 if (!acpi_battery_present(battery)) {
593 seq_printf(seq, "present: no\n");
594 goto end;
595 }
596 seq_printf(seq, "alarm: ");
597 if (!battery->alarm)
598 seq_printf(seq, "unsupported\n");
599 else
600 seq_printf(seq, "%u %sh\n", battery->alarm,
601 acpi_battery_units(battery));
602 end:
603 if (result)
604 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
605 return result;
606 }
607
608 static ssize_t acpi_battery_write_alarm(struct file *file,
609 const char __user * buffer,
610 size_t count, loff_t * ppos)
611 {
612 int result = 0;
613 char alarm_string[12] = { '\0' };
614 struct seq_file *m = file->private_data;
615 struct acpi_battery *battery = m->private;
616
617 if (!battery || (count > sizeof(alarm_string) - 1))
618 return -EINVAL;
619 if (!acpi_battery_present(battery)) {
620 result = -ENODEV;
621 goto end;
622 }
623 if (copy_from_user(alarm_string, buffer, count)) {
624 result = -EFAULT;
625 goto end;
626 }
627 alarm_string[count] = '\0';
628 battery->alarm = simple_strtol(alarm_string, NULL, 0);
629 result = acpi_battery_set_alarm(battery);
630 end:
631 if (!result)
632 return count;
633 return result;
634 }
635
636 typedef int(*print_func)(struct seq_file *seq, int result);
637
638 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
639 acpi_battery_print_info,
640 acpi_battery_print_state,
641 acpi_battery_print_alarm,
642 };
643
644 static int acpi_battery_read(int fid, struct seq_file *seq)
645 {
646 struct acpi_battery *battery = seq->private;
647 int result = acpi_battery_update(battery);
648 return acpi_print_funcs[fid](seq, result);
649 }
650
651 #define DECLARE_FILE_FUNCTIONS(_name) \
652 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
653 { \
654 return acpi_battery_read(_name##_tag, seq); \
655 } \
656 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
657 { \
658 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
659 }
660
661 DECLARE_FILE_FUNCTIONS(info);
662 DECLARE_FILE_FUNCTIONS(state);
663 DECLARE_FILE_FUNCTIONS(alarm);
664
665 #undef DECLARE_FILE_FUNCTIONS
666
667 #define FILE_DESCRIPTION_RO(_name) \
668 { \
669 .name = __stringify(_name), \
670 .mode = S_IRUGO, \
671 .ops = { \
672 .open = acpi_battery_##_name##_open_fs, \
673 .read = seq_read, \
674 .llseek = seq_lseek, \
675 .release = single_release, \
676 .owner = THIS_MODULE, \
677 }, \
678 }
679
680 #define FILE_DESCRIPTION_RW(_name) \
681 { \
682 .name = __stringify(_name), \
683 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
684 .ops = { \
685 .open = acpi_battery_##_name##_open_fs, \
686 .read = seq_read, \
687 .llseek = seq_lseek, \
688 .write = acpi_battery_write_##_name, \
689 .release = single_release, \
690 .owner = THIS_MODULE, \
691 }, \
692 }
693
694 static struct battery_file {
695 struct file_operations ops;
696 mode_t mode;
697 char *name;
698 } acpi_battery_file[] = {
699 FILE_DESCRIPTION_RO(info),
700 FILE_DESCRIPTION_RO(state),
701 FILE_DESCRIPTION_RW(alarm),
702 };
703
704 #undef FILE_DESCRIPTION_RO
705 #undef FILE_DESCRIPTION_RW
706
707 static int acpi_battery_add_fs(struct acpi_device *device)
708 {
709 struct proc_dir_entry *entry = NULL;
710 int i;
711
712 if (!acpi_device_dir(device)) {
713 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
714 acpi_battery_dir);
715 if (!acpi_device_dir(device))
716 return -ENODEV;
717 acpi_device_dir(device)->owner = THIS_MODULE;
718 }
719
720 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
721 entry = create_proc_entry(acpi_battery_file[i].name,
722 acpi_battery_file[i].mode, acpi_device_dir(device));
723 if (!entry)
724 return -ENODEV;
725 else {
726 entry->proc_fops = &acpi_battery_file[i].ops;
727 entry->data = acpi_driver_data(device);
728 entry->owner = THIS_MODULE;
729 }
730 }
731 return 0;
732 }
733
734 static void acpi_battery_remove_fs(struct acpi_device *device)
735 {
736 int i;
737 if (!acpi_device_dir(device))
738 return;
739 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
740 remove_proc_entry(acpi_battery_file[i].name,
741 acpi_device_dir(device));
742
743 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
744 acpi_device_dir(device) = NULL;
745 }
746
747 #endif
748
749 /* --------------------------------------------------------------------------
750 Driver Interface
751 -------------------------------------------------------------------------- */
752
753 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
754 {
755 struct acpi_battery *battery = data;
756 struct acpi_device *device;
757 if (!battery)
758 return;
759 device = battery->device;
760 acpi_battery_update(battery);
761 acpi_bus_generate_proc_event(device, event,
762 acpi_battery_present(battery));
763 acpi_bus_generate_netlink_event(device->pnp.device_class,
764 device->dev.bus_id, event,
765 acpi_battery_present(battery));
766 /* acpi_batter_update could remove power_supply object */
767 if (battery->bat.dev)
768 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
769 }
770
771 static int acpi_battery_add(struct acpi_device *device)
772 {
773 int result = 0;
774 acpi_status status = 0;
775 struct acpi_battery *battery = NULL;
776 if (!device)
777 return -EINVAL;
778 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
779 if (!battery)
780 return -ENOMEM;
781 battery->device = device;
782 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
783 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
784 acpi_driver_data(device) = battery;
785 mutex_init(&battery->lock);
786 acpi_battery_update(battery);
787 #ifdef CONFIG_ACPI_PROCFS
788 result = acpi_battery_add_fs(device);
789 if (result)
790 goto end;
791 #endif
792 status = acpi_install_notify_handler(device->handle,
793 ACPI_ALL_NOTIFY,
794 acpi_battery_notify, battery);
795 if (ACPI_FAILURE(status)) {
796 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
797 result = -ENODEV;
798 goto end;
799 }
800 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
801 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
802 device->status.battery_present ? "present" : "absent");
803 end:
804 if (result) {
805 #ifdef CONFIG_ACPI_PROCFS
806 acpi_battery_remove_fs(device);
807 #endif
808 kfree(battery);
809 }
810 return result;
811 }
812
813 static int acpi_battery_remove(struct acpi_device *device, int type)
814 {
815 acpi_status status = 0;
816 struct acpi_battery *battery = NULL;
817
818 if (!device || !acpi_driver_data(device))
819 return -EINVAL;
820 battery = acpi_driver_data(device);
821 status = acpi_remove_notify_handler(device->handle,
822 ACPI_ALL_NOTIFY,
823 acpi_battery_notify);
824 #ifdef CONFIG_ACPI_PROCFS
825 acpi_battery_remove_fs(device);
826 #endif
827 sysfs_remove_battery(battery);
828 mutex_destroy(&battery->lock);
829 kfree(battery);
830 return 0;
831 }
832
833 /* this is needed to learn about changes made in suspended state */
834 static int acpi_battery_resume(struct acpi_device *device)
835 {
836 struct acpi_battery *battery;
837 if (!device)
838 return -EINVAL;
839 battery = acpi_driver_data(device);
840 battery->update_time = 0;
841 acpi_battery_update(battery);
842 return 0;
843 }
844
845 static struct acpi_driver acpi_battery_driver = {
846 .name = "battery",
847 .class = ACPI_BATTERY_CLASS,
848 .ids = battery_device_ids,
849 .ops = {
850 .add = acpi_battery_add,
851 .resume = acpi_battery_resume,
852 .remove = acpi_battery_remove,
853 },
854 };
855
856 static int __init acpi_battery_init(void)
857 {
858 if (acpi_disabled)
859 return -ENODEV;
860 #ifdef CONFIG_ACPI_PROCFS
861 acpi_battery_dir = acpi_lock_battery_dir();
862 if (!acpi_battery_dir)
863 return -ENODEV;
864 #endif
865 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
866 #ifdef CONFIG_ACPI_PROCFS
867 acpi_unlock_battery_dir(acpi_battery_dir);
868 #endif
869 return -ENODEV;
870 }
871 return 0;
872 }
873
874 static void __exit acpi_battery_exit(void)
875 {
876 acpi_bus_unregister_driver(&acpi_battery_driver);
877 #ifdef CONFIG_ACPI_PROCFS
878 acpi_unlock_battery_dir(acpi_battery_dir);
879 #endif
880 }
881
882 module_init(acpi_battery_init);
883 module_exit(acpi_battery_exit);
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