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USB: storage: unusual_devs entry for Mio C520-GPS
[linux-2.6/mini2440.git] / drivers / acpi / battery.c
bloba0a178dd189c3259fcc82f323b6c4011fe1442a4
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 /* if power units are mW, convert to mA by
178 dividing by current voltage (mV/1000) */
179 if (!battery->power_unit) {
180 if (battery->voltage_now) {
181 val->intval /= battery->voltage_now;
182 val->intval *= 1000;
183 } else
184 val->intval = -1;
185 }
186 break;
187 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
188 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
189 val->intval = battery->design_capacity * 1000;
190 break;
191 case POWER_SUPPLY_PROP_CHARGE_FULL:
192 case POWER_SUPPLY_PROP_ENERGY_FULL:
193 val->intval = battery->full_charge_capacity * 1000;
194 break;
195 case POWER_SUPPLY_PROP_CHARGE_NOW:
196 case POWER_SUPPLY_PROP_ENERGY_NOW:
197 val->intval = battery->capacity_now * 1000;
198 break;
199 case POWER_SUPPLY_PROP_MODEL_NAME:
200 val->strval = battery->model_number;
201 break;
202 case POWER_SUPPLY_PROP_MANUFACTURER:
203 val->strval = battery->oem_info;
204 break;
205 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
206 val->strval = battery->serial_number;
207 break;
208 default:
209 return -EINVAL;
210 }
211 return 0;
212 }
213
214 static enum power_supply_property charge_battery_props[] = {
215 POWER_SUPPLY_PROP_STATUS,
216 POWER_SUPPLY_PROP_PRESENT,
217 POWER_SUPPLY_PROP_TECHNOLOGY,
218 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
219 POWER_SUPPLY_PROP_VOLTAGE_NOW,
220 POWER_SUPPLY_PROP_CURRENT_NOW,
221 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
222 POWER_SUPPLY_PROP_CHARGE_FULL,
223 POWER_SUPPLY_PROP_CHARGE_NOW,
224 POWER_SUPPLY_PROP_MODEL_NAME,
225 POWER_SUPPLY_PROP_MANUFACTURER,
226 POWER_SUPPLY_PROP_SERIAL_NUMBER,
227 };
228
229 static enum power_supply_property energy_battery_props[] = {
230 POWER_SUPPLY_PROP_STATUS,
231 POWER_SUPPLY_PROP_PRESENT,
232 POWER_SUPPLY_PROP_TECHNOLOGY,
233 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
234 POWER_SUPPLY_PROP_VOLTAGE_NOW,
235 POWER_SUPPLY_PROP_CURRENT_NOW,
236 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
237 POWER_SUPPLY_PROP_ENERGY_FULL,
238 POWER_SUPPLY_PROP_ENERGY_NOW,
239 POWER_SUPPLY_PROP_MODEL_NAME,
240 POWER_SUPPLY_PROP_MANUFACTURER,
241 POWER_SUPPLY_PROP_SERIAL_NUMBER,
242 };
243 #endif
244
245 #ifdef CONFIG_ACPI_PROCFS_POWER
246 inline char *acpi_battery_units(struct acpi_battery *battery)
247 {
248 return (battery->power_unit)?"mA":"mW";
249 }
250 #endif
251
252 /* --------------------------------------------------------------------------
253 Battery Management
254 -------------------------------------------------------------------------- */
255 struct acpi_offsets {
256 size_t offset; /* offset inside struct acpi_sbs_battery */
257 u8 mode; /* int or string? */
258 };
259
260 static struct acpi_offsets state_offsets[] = {
261 {offsetof(struct acpi_battery, state), 0},
262 {offsetof(struct acpi_battery, current_now), 0},
263 {offsetof(struct acpi_battery, capacity_now), 0},
264 {offsetof(struct acpi_battery, voltage_now), 0},
265 };
266
267 static struct acpi_offsets info_offsets[] = {
268 {offsetof(struct acpi_battery, power_unit), 0},
269 {offsetof(struct acpi_battery, design_capacity), 0},
270 {offsetof(struct acpi_battery, full_charge_capacity), 0},
271 {offsetof(struct acpi_battery, technology), 0},
272 {offsetof(struct acpi_battery, design_voltage), 0},
273 {offsetof(struct acpi_battery, design_capacity_warning), 0},
274 {offsetof(struct acpi_battery, design_capacity_low), 0},
275 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
276 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
277 {offsetof(struct acpi_battery, model_number), 1},
278 {offsetof(struct acpi_battery, serial_number), 1},
279 {offsetof(struct acpi_battery, type), 1},
280 {offsetof(struct acpi_battery, oem_info), 1},
281 };
282
283 static int extract_package(struct acpi_battery *battery,
284 union acpi_object *package,
285 struct acpi_offsets *offsets, int num)
286 {
287 int i;
288 union acpi_object *element;
289 if (package->type != ACPI_TYPE_PACKAGE)
290 return -EFAULT;
291 for (i = 0; i < num; ++i) {
292 if (package->package.count <= i)
293 return -EFAULT;
294 element = &package->package.elements[i];
295 if (offsets[i].mode) {
296 u8 *ptr = (u8 *)battery + offsets[i].offset;
297 if (element->type == ACPI_TYPE_STRING ||
298 element->type == ACPI_TYPE_BUFFER)
299 strncpy(ptr, element->string.pointer, 32);
300 else if (element->type == ACPI_TYPE_INTEGER) {
301 strncpy(ptr, (u8 *)&element->integer.value,
302 sizeof(acpi_integer));
303 ptr[sizeof(acpi_integer)] = 0;
304 } else
305 *ptr = 0; /* don't have value */
306 } else {
307 int *x = (int *)((u8 *)battery + offsets[i].offset);
308 *x = (element->type == ACPI_TYPE_INTEGER) ?
309 element->integer.value : -1;
310 }
311 }
312 return 0;
313 }
314
315 static int acpi_battery_get_status(struct acpi_battery *battery)
316 {
317 if (acpi_bus_get_status(battery->device)) {
318 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
319 return -ENODEV;
320 }
321 return 0;
322 }
323
324 static int acpi_battery_get_info(struct acpi_battery *battery)
325 {
326 int result = -EFAULT;
327 acpi_status status = 0;
328 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
329
330 if (!acpi_battery_present(battery))
331 return 0;
332 mutex_lock(&battery->lock);
333 status = acpi_evaluate_object(battery->device->handle, "_BIF",
334 NULL, &buffer);
335 mutex_unlock(&battery->lock);
336
337 if (ACPI_FAILURE(status)) {
338 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
339 return -ENODEV;
340 }
341
342 result = extract_package(battery, buffer.pointer,
343 info_offsets, ARRAY_SIZE(info_offsets));
344 kfree(buffer.pointer);
345 return result;
346 }
347
348 static int acpi_battery_get_state(struct acpi_battery *battery)
349 {
350 int result = 0;
351 acpi_status status = 0;
352 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
353
354 if (!acpi_battery_present(battery))
355 return 0;
356
357 if (battery->update_time &&
358 time_before(jiffies, battery->update_time +
359 msecs_to_jiffies(cache_time)))
360 return 0;
361
362 mutex_lock(&battery->lock);
363 status = acpi_evaluate_object(battery->device->handle, "_BST",
364 NULL, &buffer);
365 mutex_unlock(&battery->lock);
366
367 if (ACPI_FAILURE(status)) {
368 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
369 return -ENODEV;
370 }
371
372 result = extract_package(battery, buffer.pointer,
373 state_offsets, ARRAY_SIZE(state_offsets));
374 battery->update_time = jiffies;
375 kfree(buffer.pointer);
376 return result;
377 }
378
379 static int acpi_battery_set_alarm(struct acpi_battery *battery)
380 {
381 acpi_status status = 0;
382 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
383 struct acpi_object_list arg_list = { 1, &arg0 };
384
385 if (!acpi_battery_present(battery)|| !battery->alarm_present)
386 return -ENODEV;
387
388 arg0.integer.value = battery->alarm;
389
390 mutex_lock(&battery->lock);
391 status = acpi_evaluate_object(battery->device->handle, "_BTP",
392 &arg_list, NULL);
393 mutex_unlock(&battery->lock);
394
395 if (ACPI_FAILURE(status))
396 return -ENODEV;
397
398 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
399 return 0;
400 }
401
402 static int acpi_battery_init_alarm(struct acpi_battery *battery)
403 {
404 acpi_status status = AE_OK;
405 acpi_handle handle = NULL;
406
407 /* See if alarms are supported, and if so, set default */
408 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
409 if (ACPI_FAILURE(status)) {
410 battery->alarm_present = 0;
411 return 0;
412 }
413 battery->alarm_present = 1;
414 if (!battery->alarm)
415 battery->alarm = battery->design_capacity_warning;
416 return acpi_battery_set_alarm(battery);
417 }
418
419 #ifdef CONFIG_ACPI_SYSFS_POWER
420 static ssize_t acpi_battery_alarm_show(struct device *dev,
421 struct device_attribute *attr,
422 char *buf)
423 {
424 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
425 return sprintf(buf, "%d\n", battery->alarm * 1000);
426 }
427
428 static ssize_t acpi_battery_alarm_store(struct device *dev,
429 struct device_attribute *attr,
430 const char *buf, size_t count)
431 {
432 unsigned long x;
433 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
434 if (sscanf(buf, "%ld\n", &x) == 1)
435 battery->alarm = x/1000;
436 if (acpi_battery_present(battery))
437 acpi_battery_set_alarm(battery);
438 return count;
439 }
440
441 static struct device_attribute alarm_attr = {
442 .attr = {.name = "alarm", .mode = 0644},
443 .show = acpi_battery_alarm_show,
444 .store = acpi_battery_alarm_store,
445 };
446
447 static int sysfs_add_battery(struct acpi_battery *battery)
448 {
449 int result;
450
451 if (battery->power_unit) {
452 battery->bat.properties = charge_battery_props;
453 battery->bat.num_properties =
454 ARRAY_SIZE(charge_battery_props);
455 } else {
456 battery->bat.properties = energy_battery_props;
457 battery->bat.num_properties =
458 ARRAY_SIZE(energy_battery_props);
459 }
460
461 battery->bat.name = acpi_device_bid(battery->device);
462 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
463 battery->bat.get_property = acpi_battery_get_property;
464
465 result = power_supply_register(&battery->device->dev, &battery->bat);
466 if (result)
467 return result;
468 return device_create_file(battery->bat.dev, &alarm_attr);
469 }
470
471 static void sysfs_remove_battery(struct acpi_battery *battery)
472 {
473 if (!battery->bat.dev)
474 return;
475 device_remove_file(battery->bat.dev, &alarm_attr);
476 power_supply_unregister(&battery->bat);
477 battery->bat.dev = NULL;
478 }
479 #endif
480
481 static int acpi_battery_update(struct acpi_battery *battery)
482 {
483 int result;
484 result = acpi_battery_get_status(battery);
485 if (result)
486 return result;
487 #ifdef CONFIG_ACPI_SYSFS_POWER
488 if (!acpi_battery_present(battery)) {
489 sysfs_remove_battery(battery);
490 battery->update_time = 0;
491 return 0;
492 }
493 #endif
494 if (!battery->update_time) {
495 result = acpi_battery_get_info(battery);
496 if (result)
497 return result;
498 acpi_battery_init_alarm(battery);
499 }
500 #ifdef CONFIG_ACPI_SYSFS_POWER
501 if (!battery->bat.dev)
502 sysfs_add_battery(battery);
503 #endif
504 return acpi_battery_get_state(battery);
505 }
506
507 /* --------------------------------------------------------------------------
508 FS Interface (/proc)
509 -------------------------------------------------------------------------- */
510
511 #ifdef CONFIG_ACPI_PROCFS_POWER
512 static struct proc_dir_entry *acpi_battery_dir;
513
514 static int acpi_battery_print_info(struct seq_file *seq, int result)
515 {
516 struct acpi_battery *battery = seq->private;
517
518 if (result)
519 goto end;
520
521 seq_printf(seq, "present: %s\n",
522 acpi_battery_present(battery)?"yes":"no");
523 if (!acpi_battery_present(battery))
524 goto end;
525 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
526 seq_printf(seq, "design capacity: unknown\n");
527 else
528 seq_printf(seq, "design capacity: %d %sh\n",
529 battery->design_capacity,
530 acpi_battery_units(battery));
531
532 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
533 seq_printf(seq, "last full capacity: unknown\n");
534 else
535 seq_printf(seq, "last full capacity: %d %sh\n",
536 battery->full_charge_capacity,
537 acpi_battery_units(battery));
538
539 seq_printf(seq, "battery technology: %srechargeable\n",
540 (!battery->technology)?"non-":"");
541
542 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
543 seq_printf(seq, "design voltage: unknown\n");
544 else
545 seq_printf(seq, "design voltage: %d mV\n",
546 battery->design_voltage);
547 seq_printf(seq, "design capacity warning: %d %sh\n",
548 battery->design_capacity_warning,
549 acpi_battery_units(battery));
550 seq_printf(seq, "design capacity low: %d %sh\n",
551 battery->design_capacity_low,
552 acpi_battery_units(battery));
553 seq_printf(seq, "capacity granularity 1: %d %sh\n",
554 battery->capacity_granularity_1,
555 acpi_battery_units(battery));
556 seq_printf(seq, "capacity granularity 2: %d %sh\n",
557 battery->capacity_granularity_2,
558 acpi_battery_units(battery));
559 seq_printf(seq, "model number: %s\n", battery->model_number);
560 seq_printf(seq, "serial number: %s\n", battery->serial_number);
561 seq_printf(seq, "battery type: %s\n", battery->type);
562 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
563 end:
564 if (result)
565 seq_printf(seq, "ERROR: Unable to read battery info\n");
566 return result;
567 }
568
569 static int acpi_battery_print_state(struct seq_file *seq, int result)
570 {
571 struct acpi_battery *battery = seq->private;
572
573 if (result)
574 goto end;
575
576 seq_printf(seq, "present: %s\n",
577 acpi_battery_present(battery)?"yes":"no");
578 if (!acpi_battery_present(battery))
579 goto end;
580
581 seq_printf(seq, "capacity state: %s\n",
582 (battery->state & 0x04)?"critical":"ok");
583 if ((battery->state & 0x01) && (battery->state & 0x02))
584 seq_printf(seq,
585 "charging state: charging/discharging\n");
586 else if (battery->state & 0x01)
587 seq_printf(seq, "charging state: discharging\n");
588 else if (battery->state & 0x02)
589 seq_printf(seq, "charging state: charging\n");
590 else
591 seq_printf(seq, "charging state: charged\n");
592
593 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
594 seq_printf(seq, "present rate: unknown\n");
595 else
596 seq_printf(seq, "present rate: %d %s\n",
597 battery->current_now, acpi_battery_units(battery));
598
599 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
600 seq_printf(seq, "remaining capacity: unknown\n");
601 else
602 seq_printf(seq, "remaining capacity: %d %sh\n",
603 battery->capacity_now, acpi_battery_units(battery));
604 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
605 seq_printf(seq, "present voltage: unknown\n");
606 else
607 seq_printf(seq, "present voltage: %d mV\n",
608 battery->voltage_now);
609 end:
610 if (result)
611 seq_printf(seq, "ERROR: Unable to read battery state\n");
612
613 return result;
614 }
615
616 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
617 {
618 struct acpi_battery *battery = seq->private;
619
620 if (result)
621 goto end;
622
623 if (!acpi_battery_present(battery)) {
624 seq_printf(seq, "present: no\n");
625 goto end;
626 }
627 seq_printf(seq, "alarm: ");
628 if (!battery->alarm)
629 seq_printf(seq, "unsupported\n");
630 else
631 seq_printf(seq, "%u %sh\n", battery->alarm,
632 acpi_battery_units(battery));
633 end:
634 if (result)
635 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
636 return result;
637 }
638
639 static ssize_t acpi_battery_write_alarm(struct file *file,
640 const char __user * buffer,
641 size_t count, loff_t * ppos)
642 {
643 int result = 0;
644 char alarm_string[12] = { '\0' };
645 struct seq_file *m = file->private_data;
646 struct acpi_battery *battery = m->private;
647
648 if (!battery || (count > sizeof(alarm_string) - 1))
649 return -EINVAL;
650 if (!acpi_battery_present(battery)) {
651 result = -ENODEV;
652 goto end;
653 }
654 if (copy_from_user(alarm_string, buffer, count)) {
655 result = -EFAULT;
656 goto end;
657 }
658 alarm_string[count] = '\0';
659 battery->alarm = simple_strtol(alarm_string, NULL, 0);
660 result = acpi_battery_set_alarm(battery);
661 end:
662 if (!result)
663 return count;
664 return result;
665 }
666
667 typedef int(*print_func)(struct seq_file *seq, int result);
668
669 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
670 acpi_battery_print_info,
671 acpi_battery_print_state,
672 acpi_battery_print_alarm,
673 };
674
675 static int acpi_battery_read(int fid, struct seq_file *seq)
676 {
677 struct acpi_battery *battery = seq->private;
678 int result = acpi_battery_update(battery);
679 return acpi_print_funcs[fid](seq, result);
680 }
681
682 #define DECLARE_FILE_FUNCTIONS(_name) \
683 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
684 { \
685 return acpi_battery_read(_name##_tag, seq); \
686 } \
687 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
688 { \
689 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
690 }
691
692 DECLARE_FILE_FUNCTIONS(info);
693 DECLARE_FILE_FUNCTIONS(state);
694 DECLARE_FILE_FUNCTIONS(alarm);
695
696 #undef DECLARE_FILE_FUNCTIONS
697
698 #define FILE_DESCRIPTION_RO(_name) \
699 { \
700 .name = __stringify(_name), \
701 .mode = S_IRUGO, \
702 .ops = { \
703 .open = acpi_battery_##_name##_open_fs, \
704 .read = seq_read, \
705 .llseek = seq_lseek, \
706 .release = single_release, \
707 .owner = THIS_MODULE, \
708 }, \
709 }
710
711 #define FILE_DESCRIPTION_RW(_name) \
712 { \
713 .name = __stringify(_name), \
714 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
715 .ops = { \
716 .open = acpi_battery_##_name##_open_fs, \
717 .read = seq_read, \
718 .llseek = seq_lseek, \
719 .write = acpi_battery_write_##_name, \
720 .release = single_release, \
721 .owner = THIS_MODULE, \
722 }, \
723 }
724
725 static struct battery_file {
726 struct file_operations ops;
727 mode_t mode;
728 char *name;
729 } acpi_battery_file[] = {
730 FILE_DESCRIPTION_RO(info),
731 FILE_DESCRIPTION_RO(state),
732 FILE_DESCRIPTION_RW(alarm),
733 };
734
735 #undef FILE_DESCRIPTION_RO
736 #undef FILE_DESCRIPTION_RW
737
738 static int acpi_battery_add_fs(struct acpi_device *device)
739 {
740 struct proc_dir_entry *entry = NULL;
741 int i;
742
743 if (!acpi_device_dir(device)) {
744 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
745 acpi_battery_dir);
746 if (!acpi_device_dir(device))
747 return -ENODEV;
748 acpi_device_dir(device)->owner = THIS_MODULE;
749 }
750
751 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
752 entry = proc_create_data(acpi_battery_file[i].name,
753 acpi_battery_file[i].mode,
754 acpi_device_dir(device),
755 &acpi_battery_file[i].ops,
756 acpi_driver_data(device));
757 if (!entry)
758 return -ENODEV;
759 }
760 return 0;
761 }
762
763 static void acpi_battery_remove_fs(struct acpi_device *device)
764 {
765 int i;
766 if (!acpi_device_dir(device))
767 return;
768 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
769 remove_proc_entry(acpi_battery_file[i].name,
770 acpi_device_dir(device));
771
772 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
773 acpi_device_dir(device) = NULL;
774 }
775
776 #endif
777
778 /* --------------------------------------------------------------------------
779 Driver Interface
780 -------------------------------------------------------------------------- */
781
782 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
783 {
784 struct acpi_battery *battery = data;
785 struct acpi_device *device;
786 if (!battery)
787 return;
788 device = battery->device;
789 acpi_battery_update(battery);
790 acpi_bus_generate_proc_event(device, event,
791 acpi_battery_present(battery));
792 acpi_bus_generate_netlink_event(device->pnp.device_class,
793 dev_name(&device->dev), event,
794 acpi_battery_present(battery));
795 #ifdef CONFIG_ACPI_SYSFS_POWER
796 /* acpi_batter_update could remove power_supply object */
797 if (battery->bat.dev)
798 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
799 #endif
800 }
801
802 static int acpi_battery_add(struct acpi_device *device)
803 {
804 int result = 0;
805 acpi_status status = 0;
806 struct acpi_battery *battery = NULL;
807 if (!device)
808 return -EINVAL;
809 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
810 if (!battery)
811 return -ENOMEM;
812 battery->device = device;
813 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
814 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
815 device->driver_data = battery;
816 mutex_init(&battery->lock);
817 acpi_battery_update(battery);
818 #ifdef CONFIG_ACPI_PROCFS_POWER
819 result = acpi_battery_add_fs(device);
820 if (result)
821 goto end;
822 #endif
823 status = acpi_install_notify_handler(device->handle,
824 ACPI_ALL_NOTIFY,
825 acpi_battery_notify, battery);
826 if (ACPI_FAILURE(status)) {
827 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
828 result = -ENODEV;
829 goto end;
830 }
831 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
832 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
833 device->status.battery_present ? "present" : "absent");
834 end:
835 if (result) {
836 #ifdef CONFIG_ACPI_PROCFS_POWER
837 acpi_battery_remove_fs(device);
838 #endif
839 kfree(battery);
840 }
841 return result;
842 }
843
844 static int acpi_battery_remove(struct acpi_device *device, int type)
845 {
846 acpi_status status = 0;
847 struct acpi_battery *battery = NULL;
848
849 if (!device || !acpi_driver_data(device))
850 return -EINVAL;
851 battery = acpi_driver_data(device);
852 status = acpi_remove_notify_handler(device->handle,
853 ACPI_ALL_NOTIFY,
854 acpi_battery_notify);
855 #ifdef CONFIG_ACPI_PROCFS_POWER
856 acpi_battery_remove_fs(device);
857 #endif
858 #ifdef CONFIG_ACPI_SYSFS_POWER
859 sysfs_remove_battery(battery);
860 #endif
861 mutex_destroy(&battery->lock);
862 kfree(battery);
863 return 0;
864 }
865
866 /* this is needed to learn about changes made in suspended state */
867 static int acpi_battery_resume(struct acpi_device *device)
868 {
869 struct acpi_battery *battery;
870 if (!device)
871 return -EINVAL;
872 battery = acpi_driver_data(device);
873 battery->update_time = 0;
874 acpi_battery_update(battery);
875 return 0;
876 }
877
878 static struct acpi_driver acpi_battery_driver = {
879 .name = "battery",
880 .class = ACPI_BATTERY_CLASS,
881 .ids = battery_device_ids,
882 .ops = {
883 .add = acpi_battery_add,
884 .resume = acpi_battery_resume,
885 .remove = acpi_battery_remove,
886 },
887 };
888
889 static int __init acpi_battery_init(void)
890 {
891 if (acpi_disabled)
892 return -ENODEV;
893 #ifdef CONFIG_ACPI_PROCFS_POWER
894 acpi_battery_dir = acpi_lock_battery_dir();
895 if (!acpi_battery_dir)
896 return -ENODEV;
897 #endif
898 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
899 #ifdef CONFIG_ACPI_PROCFS_POWER
900 acpi_unlock_battery_dir(acpi_battery_dir);
901 #endif
902 return -ENODEV;
903 }
904 return 0;
905 }
906
907 static void __exit acpi_battery_exit(void)
908 {
909 acpi_bus_unregister_driver(&acpi_battery_driver);
910 #ifdef CONFIG_ACPI_PROCFS_POWER
911 acpi_unlock_battery_dir(acpi_battery_dir);
912 #endif
913 }
914
915 module_init(acpi_battery_init);
916 module_exit(acpi_battery_exit);
Support for the Chinese Samsung S3C2440 based development boards