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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / acpi / battery.c
blobd5729d5dc1904564921cede6f7f80d72b987205c
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 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
198 val->strval = battery->serial_number;
199 break;
200 default:
201 return -EINVAL;
202 }
203 return 0;
204 }
205
206 static enum power_supply_property charge_battery_props[] = {
207 POWER_SUPPLY_PROP_STATUS,
208 POWER_SUPPLY_PROP_PRESENT,
209 POWER_SUPPLY_PROP_TECHNOLOGY,
210 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
211 POWER_SUPPLY_PROP_VOLTAGE_NOW,
212 POWER_SUPPLY_PROP_CURRENT_NOW,
213 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
214 POWER_SUPPLY_PROP_CHARGE_FULL,
215 POWER_SUPPLY_PROP_CHARGE_NOW,
216 POWER_SUPPLY_PROP_MODEL_NAME,
217 POWER_SUPPLY_PROP_MANUFACTURER,
218 POWER_SUPPLY_PROP_SERIAL_NUMBER,
219 };
220
221 static enum power_supply_property energy_battery_props[] = {
222 POWER_SUPPLY_PROP_STATUS,
223 POWER_SUPPLY_PROP_PRESENT,
224 POWER_SUPPLY_PROP_TECHNOLOGY,
225 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
226 POWER_SUPPLY_PROP_VOLTAGE_NOW,
227 POWER_SUPPLY_PROP_CURRENT_NOW,
228 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
229 POWER_SUPPLY_PROP_ENERGY_FULL,
230 POWER_SUPPLY_PROP_ENERGY_NOW,
231 POWER_SUPPLY_PROP_MODEL_NAME,
232 POWER_SUPPLY_PROP_MANUFACTURER,
233 POWER_SUPPLY_PROP_SERIAL_NUMBER,
234 };
235 #endif
236
237 #ifdef CONFIG_ACPI_PROCFS_POWER
238 inline char *acpi_battery_units(struct acpi_battery *battery)
239 {
240 return (battery->power_unit)?"mA":"mW";
241 }
242 #endif
243
244 /* --------------------------------------------------------------------------
245 Battery Management
246 -------------------------------------------------------------------------- */
247 struct acpi_offsets {
248 size_t offset; /* offset inside struct acpi_sbs_battery */
249 u8 mode; /* int or string? */
250 };
251
252 static struct acpi_offsets state_offsets[] = {
253 {offsetof(struct acpi_battery, state), 0},
254 {offsetof(struct acpi_battery, current_now), 0},
255 {offsetof(struct acpi_battery, capacity_now), 0},
256 {offsetof(struct acpi_battery, voltage_now), 0},
257 };
258
259 static struct acpi_offsets info_offsets[] = {
260 {offsetof(struct acpi_battery, power_unit), 0},
261 {offsetof(struct acpi_battery, design_capacity), 0},
262 {offsetof(struct acpi_battery, full_charge_capacity), 0},
263 {offsetof(struct acpi_battery, technology), 0},
264 {offsetof(struct acpi_battery, design_voltage), 0},
265 {offsetof(struct acpi_battery, design_capacity_warning), 0},
266 {offsetof(struct acpi_battery, design_capacity_low), 0},
267 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
268 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
269 {offsetof(struct acpi_battery, model_number), 1},
270 {offsetof(struct acpi_battery, serial_number), 1},
271 {offsetof(struct acpi_battery, type), 1},
272 {offsetof(struct acpi_battery, oem_info), 1},
273 };
274
275 static int extract_package(struct acpi_battery *battery,
276 union acpi_object *package,
277 struct acpi_offsets *offsets, int num)
278 {
279 int i;
280 union acpi_object *element;
281 if (package->type != ACPI_TYPE_PACKAGE)
282 return -EFAULT;
283 for (i = 0; i < num; ++i) {
284 if (package->package.count <= i)
285 return -EFAULT;
286 element = &package->package.elements[i];
287 if (offsets[i].mode) {
288 u8 *ptr = (u8 *)battery + offsets[i].offset;
289 if (element->type == ACPI_TYPE_STRING ||
290 element->type == ACPI_TYPE_BUFFER)
291 strncpy(ptr, element->string.pointer, 32);
292 else if (element->type == ACPI_TYPE_INTEGER) {
293 strncpy(ptr, (u8 *)&element->integer.value,
294 sizeof(acpi_integer));
295 ptr[sizeof(acpi_integer)] = 0;
296 } else
297 *ptr = 0; /* don't have value */
298 } else {
299 int *x = (int *)((u8 *)battery + offsets[i].offset);
300 *x = (element->type == ACPI_TYPE_INTEGER) ?
301 element->integer.value : -1;
302 }
303 }
304 return 0;
305 }
306
307 static int acpi_battery_get_status(struct acpi_battery *battery)
308 {
309 if (acpi_bus_get_status(battery->device)) {
310 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
311 return -ENODEV;
312 }
313 return 0;
314 }
315
316 static int acpi_battery_get_info(struct acpi_battery *battery)
317 {
318 int result = -EFAULT;
319 acpi_status status = 0;
320 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
321
322 if (!acpi_battery_present(battery))
323 return 0;
324 mutex_lock(&battery->lock);
325 status = acpi_evaluate_object(battery->device->handle, "_BIF",
326 NULL, &buffer);
327 mutex_unlock(&battery->lock);
328
329 if (ACPI_FAILURE(status)) {
330 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
331 return -ENODEV;
332 }
333
334 result = extract_package(battery, buffer.pointer,
335 info_offsets, ARRAY_SIZE(info_offsets));
336 kfree(buffer.pointer);
337 return result;
338 }
339
340 static int acpi_battery_get_state(struct acpi_battery *battery)
341 {
342 int result = 0;
343 acpi_status status = 0;
344 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
345
346 if (!acpi_battery_present(battery))
347 return 0;
348
349 if (battery->update_time &&
350 time_before(jiffies, battery->update_time +
351 msecs_to_jiffies(cache_time)))
352 return 0;
353
354 mutex_lock(&battery->lock);
355 status = acpi_evaluate_object(battery->device->handle, "_BST",
356 NULL, &buffer);
357 mutex_unlock(&battery->lock);
358
359 if (ACPI_FAILURE(status)) {
360 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
361 return -ENODEV;
362 }
363
364 result = extract_package(battery, buffer.pointer,
365 state_offsets, ARRAY_SIZE(state_offsets));
366 battery->update_time = jiffies;
367 kfree(buffer.pointer);
368 return result;
369 }
370
371 static int acpi_battery_set_alarm(struct acpi_battery *battery)
372 {
373 acpi_status status = 0;
374 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
375 struct acpi_object_list arg_list = { 1, &arg0 };
376
377 if (!acpi_battery_present(battery)|| !battery->alarm_present)
378 return -ENODEV;
379
380 arg0.integer.value = battery->alarm;
381
382 mutex_lock(&battery->lock);
383 status = acpi_evaluate_object(battery->device->handle, "_BTP",
384 &arg_list, NULL);
385 mutex_unlock(&battery->lock);
386
387 if (ACPI_FAILURE(status))
388 return -ENODEV;
389
390 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
391 return 0;
392 }
393
394 static int acpi_battery_init_alarm(struct acpi_battery *battery)
395 {
396 acpi_status status = AE_OK;
397 acpi_handle handle = NULL;
398
399 /* See if alarms are supported, and if so, set default */
400 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
401 if (ACPI_FAILURE(status)) {
402 battery->alarm_present = 0;
403 return 0;
404 }
405 battery->alarm_present = 1;
406 if (!battery->alarm)
407 battery->alarm = battery->design_capacity_warning;
408 return acpi_battery_set_alarm(battery);
409 }
410
411 #ifdef CONFIG_ACPI_SYSFS_POWER
412 static ssize_t acpi_battery_alarm_show(struct device *dev,
413 struct device_attribute *attr,
414 char *buf)
415 {
416 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
417 return sprintf(buf, "%d\n", battery->alarm * 1000);
418 }
419
420 static ssize_t acpi_battery_alarm_store(struct device *dev,
421 struct device_attribute *attr,
422 const char *buf, size_t count)
423 {
424 unsigned long x;
425 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
426 if (sscanf(buf, "%ld\n", &x) == 1)
427 battery->alarm = x/1000;
428 if (acpi_battery_present(battery))
429 acpi_battery_set_alarm(battery);
430 return count;
431 }
432
433 static struct device_attribute alarm_attr = {
434 .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
435 .show = acpi_battery_alarm_show,
436 .store = acpi_battery_alarm_store,
437 };
438
439 static int sysfs_add_battery(struct acpi_battery *battery)
440 {
441 int result;
442
443 if (battery->power_unit) {
444 battery->bat.properties = charge_battery_props;
445 battery->bat.num_properties =
446 ARRAY_SIZE(charge_battery_props);
447 } else {
448 battery->bat.properties = energy_battery_props;
449 battery->bat.num_properties =
450 ARRAY_SIZE(energy_battery_props);
451 }
452
453 battery->bat.name = acpi_device_bid(battery->device);
454 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
455 battery->bat.get_property = acpi_battery_get_property;
456
457 result = power_supply_register(&battery->device->dev, &battery->bat);
458 if (result)
459 return result;
460 return device_create_file(battery->bat.dev, &alarm_attr);
461 }
462
463 static void sysfs_remove_battery(struct acpi_battery *battery)
464 {
465 if (!battery->bat.dev)
466 return;
467 device_remove_file(battery->bat.dev, &alarm_attr);
468 power_supply_unregister(&battery->bat);
469 battery->bat.dev = NULL;
470 }
471 #endif
472
473 static int acpi_battery_update(struct acpi_battery *battery)
474 {
475 int result;
476 result = acpi_battery_get_status(battery);
477 if (result)
478 return result;
479 #ifdef CONFIG_ACPI_SYSFS_POWER
480 if (!acpi_battery_present(battery)) {
481 sysfs_remove_battery(battery);
482 battery->update_time = 0;
483 return 0;
484 }
485 #endif
486 if (!battery->update_time) {
487 result = acpi_battery_get_info(battery);
488 if (result)
489 return result;
490 acpi_battery_init_alarm(battery);
491 }
492 #ifdef CONFIG_ACPI_SYSFS_POWER
493 if (!battery->bat.dev)
494 sysfs_add_battery(battery);
495 #endif
496 return acpi_battery_get_state(battery);
497 }
498
499 /* --------------------------------------------------------------------------
500 FS Interface (/proc)
501 -------------------------------------------------------------------------- */
502
503 #ifdef CONFIG_ACPI_PROCFS_POWER
504 static struct proc_dir_entry *acpi_battery_dir;
505
506 static int acpi_battery_print_info(struct seq_file *seq, int result)
507 {
508 struct acpi_battery *battery = seq->private;
509
510 if (result)
511 goto end;
512
513 seq_printf(seq, "present: %s\n",
514 acpi_battery_present(battery)?"yes":"no");
515 if (!acpi_battery_present(battery))
516 goto end;
517 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
518 seq_printf(seq, "design capacity: unknown\n");
519 else
520 seq_printf(seq, "design capacity: %d %sh\n",
521 battery->design_capacity,
522 acpi_battery_units(battery));
523
524 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
525 seq_printf(seq, "last full capacity: unknown\n");
526 else
527 seq_printf(seq, "last full capacity: %d %sh\n",
528 battery->full_charge_capacity,
529 acpi_battery_units(battery));
530
531 seq_printf(seq, "battery technology: %srechargeable\n",
532 (!battery->technology)?"non-":"");
533
534 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
535 seq_printf(seq, "design voltage: unknown\n");
536 else
537 seq_printf(seq, "design voltage: %d mV\n",
538 battery->design_voltage);
539 seq_printf(seq, "design capacity warning: %d %sh\n",
540 battery->design_capacity_warning,
541 acpi_battery_units(battery));
542 seq_printf(seq, "design capacity low: %d %sh\n",
543 battery->design_capacity_low,
544 acpi_battery_units(battery));
545 seq_printf(seq, "capacity granularity 1: %d %sh\n",
546 battery->capacity_granularity_1,
547 acpi_battery_units(battery));
548 seq_printf(seq, "capacity granularity 2: %d %sh\n",
549 battery->capacity_granularity_2,
550 acpi_battery_units(battery));
551 seq_printf(seq, "model number: %s\n", battery->model_number);
552 seq_printf(seq, "serial number: %s\n", battery->serial_number);
553 seq_printf(seq, "battery type: %s\n", battery->type);
554 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
555 end:
556 if (result)
557 seq_printf(seq, "ERROR: Unable to read battery info\n");
558 return result;
559 }
560
561 static int acpi_battery_print_state(struct seq_file *seq, int result)
562 {
563 struct acpi_battery *battery = seq->private;
564
565 if (result)
566 goto end;
567
568 seq_printf(seq, "present: %s\n",
569 acpi_battery_present(battery)?"yes":"no");
570 if (!acpi_battery_present(battery))
571 goto end;
572
573 seq_printf(seq, "capacity state: %s\n",
574 (battery->state & 0x04)?"critical":"ok");
575 if ((battery->state & 0x01) && (battery->state & 0x02))
576 seq_printf(seq,
577 "charging state: charging/discharging\n");
578 else if (battery->state & 0x01)
579 seq_printf(seq, "charging state: discharging\n");
580 else if (battery->state & 0x02)
581 seq_printf(seq, "charging state: charging\n");
582 else
583 seq_printf(seq, "charging state: charged\n");
584
585 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
586 seq_printf(seq, "present rate: unknown\n");
587 else
588 seq_printf(seq, "present rate: %d %s\n",
589 battery->current_now, acpi_battery_units(battery));
590
591 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
592 seq_printf(seq, "remaining capacity: unknown\n");
593 else
594 seq_printf(seq, "remaining capacity: %d %sh\n",
595 battery->capacity_now, acpi_battery_units(battery));
596 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
597 seq_printf(seq, "present voltage: unknown\n");
598 else
599 seq_printf(seq, "present voltage: %d mV\n",
600 battery->voltage_now);
601 end:
602 if (result)
603 seq_printf(seq, "ERROR: Unable to read battery state\n");
604
605 return result;
606 }
607
608 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
609 {
610 struct acpi_battery *battery = seq->private;
611
612 if (result)
613 goto end;
614
615 if (!acpi_battery_present(battery)) {
616 seq_printf(seq, "present: no\n");
617 goto end;
618 }
619 seq_printf(seq, "alarm: ");
620 if (!battery->alarm)
621 seq_printf(seq, "unsupported\n");
622 else
623 seq_printf(seq, "%u %sh\n", battery->alarm,
624 acpi_battery_units(battery));
625 end:
626 if (result)
627 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
628 return result;
629 }
630
631 static ssize_t acpi_battery_write_alarm(struct file *file,
632 const char __user * buffer,
633 size_t count, loff_t * ppos)
634 {
635 int result = 0;
636 char alarm_string[12] = { '\0' };
637 struct seq_file *m = file->private_data;
638 struct acpi_battery *battery = m->private;
639
640 if (!battery || (count > sizeof(alarm_string) - 1))
641 return -EINVAL;
642 if (!acpi_battery_present(battery)) {
643 result = -ENODEV;
644 goto end;
645 }
646 if (copy_from_user(alarm_string, buffer, count)) {
647 result = -EFAULT;
648 goto end;
649 }
650 alarm_string[count] = '\0';
651 battery->alarm = simple_strtol(alarm_string, NULL, 0);
652 result = acpi_battery_set_alarm(battery);
653 end:
654 if (!result)
655 return count;
656 return result;
657 }
658
659 typedef int(*print_func)(struct seq_file *seq, int result);
660
661 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
662 acpi_battery_print_info,
663 acpi_battery_print_state,
664 acpi_battery_print_alarm,
665 };
666
667 static int acpi_battery_read(int fid, struct seq_file *seq)
668 {
669 struct acpi_battery *battery = seq->private;
670 int result = acpi_battery_update(battery);
671 return acpi_print_funcs[fid](seq, result);
672 }
673
674 #define DECLARE_FILE_FUNCTIONS(_name) \
675 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
676 { \
677 return acpi_battery_read(_name##_tag, seq); \
678 } \
679 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
680 { \
681 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
682 }
683
684 DECLARE_FILE_FUNCTIONS(info);
685 DECLARE_FILE_FUNCTIONS(state);
686 DECLARE_FILE_FUNCTIONS(alarm);
687
688 #undef DECLARE_FILE_FUNCTIONS
689
690 #define FILE_DESCRIPTION_RO(_name) \
691 { \
692 .name = __stringify(_name), \
693 .mode = S_IRUGO, \
694 .ops = { \
695 .open = acpi_battery_##_name##_open_fs, \
696 .read = seq_read, \
697 .llseek = seq_lseek, \
698 .release = single_release, \
699 .owner = THIS_MODULE, \
700 }, \
701 }
702
703 #define FILE_DESCRIPTION_RW(_name) \
704 { \
705 .name = __stringify(_name), \
706 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
707 .ops = { \
708 .open = acpi_battery_##_name##_open_fs, \
709 .read = seq_read, \
710 .llseek = seq_lseek, \
711 .write = acpi_battery_write_##_name, \
712 .release = single_release, \
713 .owner = THIS_MODULE, \
714 }, \
715 }
716
717 static struct battery_file {
718 struct file_operations ops;
719 mode_t mode;
720 char *name;
721 } acpi_battery_file[] = {
722 FILE_DESCRIPTION_RO(info),
723 FILE_DESCRIPTION_RO(state),
724 FILE_DESCRIPTION_RW(alarm),
725 };
726
727 #undef FILE_DESCRIPTION_RO
728 #undef FILE_DESCRIPTION_RW
729
730 static int acpi_battery_add_fs(struct acpi_device *device)
731 {
732 struct proc_dir_entry *entry = NULL;
733 int i;
734
735 if (!acpi_device_dir(device)) {
736 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
737 acpi_battery_dir);
738 if (!acpi_device_dir(device))
739 return -ENODEV;
740 acpi_device_dir(device)->owner = THIS_MODULE;
741 }
742
743 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
744 entry = create_proc_entry(acpi_battery_file[i].name,
745 acpi_battery_file[i].mode, acpi_device_dir(device));
746 if (!entry)
747 return -ENODEV;
748 else {
749 entry->proc_fops = &acpi_battery_file[i].ops;
750 entry->data = acpi_driver_data(device);
751 entry->owner = THIS_MODULE;
752 }
753 }
754 return 0;
755 }
756
757 static void acpi_battery_remove_fs(struct acpi_device *device)
758 {
759 int i;
760 if (!acpi_device_dir(device))
761 return;
762 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
763 remove_proc_entry(acpi_battery_file[i].name,
764 acpi_device_dir(device));
765
766 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
767 acpi_device_dir(device) = NULL;
768 }
769
770 #endif
771
772 /* --------------------------------------------------------------------------
773 Driver Interface
774 -------------------------------------------------------------------------- */
775
776 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
777 {
778 struct acpi_battery *battery = data;
779 struct acpi_device *device;
780 if (!battery)
781 return;
782 device = battery->device;
783 acpi_battery_update(battery);
784 acpi_bus_generate_proc_event(device, event,
785 acpi_battery_present(battery));
786 acpi_bus_generate_netlink_event(device->pnp.device_class,
787 device->dev.bus_id, event,
788 acpi_battery_present(battery));
789 #ifdef CONFIG_ACPI_SYSFS_POWER
790 /* acpi_batter_update could remove power_supply object */
791 if (battery->bat.dev)
792 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
793 #endif
794 }
795
796 static int acpi_battery_add(struct acpi_device *device)
797 {
798 int result = 0;
799 acpi_status status = 0;
800 struct acpi_battery *battery = NULL;
801 if (!device)
802 return -EINVAL;
803 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
804 if (!battery)
805 return -ENOMEM;
806 battery->device = device;
807 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
808 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
809 acpi_driver_data(device) = battery;
810 mutex_init(&battery->lock);
811 acpi_battery_update(battery);
812 #ifdef CONFIG_ACPI_PROCFS_POWER
813 result = acpi_battery_add_fs(device);
814 if (result)
815 goto end;
816 #endif
817 status = acpi_install_notify_handler(device->handle,
818 ACPI_ALL_NOTIFY,
819 acpi_battery_notify, battery);
820 if (ACPI_FAILURE(status)) {
821 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
822 result = -ENODEV;
823 goto end;
824 }
825 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
826 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
827 device->status.battery_present ? "present" : "absent");
828 end:
829 if (result) {
830 #ifdef CONFIG_ACPI_PROCFS_POWER
831 acpi_battery_remove_fs(device);
832 #endif
833 kfree(battery);
834 }
835 return result;
836 }
837
838 static int acpi_battery_remove(struct acpi_device *device, int type)
839 {
840 acpi_status status = 0;
841 struct acpi_battery *battery = NULL;
842
843 if (!device || !acpi_driver_data(device))
844 return -EINVAL;
845 battery = acpi_driver_data(device);
846 status = acpi_remove_notify_handler(device->handle,
847 ACPI_ALL_NOTIFY,
848 acpi_battery_notify);
849 #ifdef CONFIG_ACPI_PROCFS_POWER
850 acpi_battery_remove_fs(device);
851 #endif
852 #ifdef CONFIG_ACPI_SYSFS_POWER
853 sysfs_remove_battery(battery);
854 #endif
855 mutex_destroy(&battery->lock);
856 kfree(battery);
857 return 0;
858 }
859
860 /* this is needed to learn about changes made in suspended state */
861 static int acpi_battery_resume(struct acpi_device *device)
862 {
863 struct acpi_battery *battery;
864 if (!device)
865 return -EINVAL;
866 battery = acpi_driver_data(device);
867 battery->update_time = 0;
868 acpi_battery_update(battery);
869 return 0;
870 }
871
872 static struct acpi_driver acpi_battery_driver = {
873 .name = "battery",
874 .class = ACPI_BATTERY_CLASS,
875 .ids = battery_device_ids,
876 .ops = {
877 .add = acpi_battery_add,
878 .resume = acpi_battery_resume,
879 .remove = acpi_battery_remove,
880 },
881 };
882
883 static int __init acpi_battery_init(void)
884 {
885 if (acpi_disabled)
886 return -ENODEV;
887 #ifdef CONFIG_ACPI_PROCFS_POWER
888 acpi_battery_dir = acpi_lock_battery_dir();
889 if (!acpi_battery_dir)
890 return -ENODEV;
891 #endif
892 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
893 #ifdef CONFIG_ACPI_PROCFS_POWER
894 acpi_unlock_battery_dir(acpi_battery_dir);
895 #endif
896 return -ENODEV;
897 }
898 return 0;
899 }
900
901 static void __exit acpi_battery_exit(void)
902 {
903 acpi_bus_unregister_driver(&acpi_battery_driver);
904 #ifdef CONFIG_ACPI_PROCFS_POWER
905 acpi_unlock_battery_dir(acpi_battery_dir);
906 #endif
907 }
908
909 module_init(acpi_battery_init);
910 module_exit(acpi_battery_exit);
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