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FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / acpi / battery.c
blobfcc13ac0aa1870009ad0fd9dc41712795e582aab
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 #include <linux/async.h>
34 #include <linux/dmi.h>
35 #include <linux/slab.h>
36 #include <linux/suspend.h>
37
38 #ifdef CONFIG_ACPI_PROCFS_POWER
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <asm/uaccess.h>
42 #endif
43
44 #include <acpi/acpi_bus.h>
45 #include <acpi/acpi_drivers.h>
46 #include <linux/power_supply.h>
47
48 #define PREFIX "ACPI: "
49
50 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
51
52 #define ACPI_BATTERY_CLASS "battery"
53 #define ACPI_BATTERY_DEVICE_NAME "Battery"
54 #define ACPI_BATTERY_NOTIFY_STATUS 0x80
55 #define ACPI_BATTERY_NOTIFY_INFO 0x81
56 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82
57
58 #define _COMPONENT ACPI_BATTERY_COMPONENT
59
60 ACPI_MODULE_NAME("battery");
61
62 MODULE_AUTHOR("Paul Diefenbaugh");
63 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
64 MODULE_DESCRIPTION("ACPI Battery Driver");
65 MODULE_LICENSE("GPL");
66
67 static unsigned int cache_time = 1000;
68 module_param(cache_time, uint, 0644);
69 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
70
71 #ifdef CONFIG_ACPI_PROCFS_POWER
72 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
73 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
74
75 enum acpi_battery_files {
76 info_tag = 0,
77 state_tag,
78 alarm_tag,
79 ACPI_BATTERY_NUMFILES,
80 };
81
82 #endif
83
84 static const struct acpi_device_id battery_device_ids[] = {
85 {"PNP0C0A", 0},
86 {"", 0},
87 };
88
89 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
90
91 enum {
92 ACPI_BATTERY_ALARM_PRESENT,
93 ACPI_BATTERY_XINFO_PRESENT,
94 /* For buggy DSDTs that report negative 16-bit values for either
95 * charging or discharging current and/or report 0 as 65536
96 * due to bad math.
97 */
98 ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
99 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
100 };
101
102 struct acpi_battery {
103 struct mutex lock;
104 struct power_supply bat;
105 struct acpi_device *device;
106 struct notifier_block pm_nb;
107 unsigned long update_time;
108 int rate_now;
109 int capacity_now;
110 int voltage_now;
111 int design_capacity;
112 int full_charge_capacity;
113 int technology;
114 int design_voltage;
115 int design_capacity_warning;
116 int design_capacity_low;
117 int cycle_count;
118 int measurement_accuracy;
119 int max_sampling_time;
120 int min_sampling_time;
121 int max_averaging_interval;
122 int min_averaging_interval;
123 int capacity_granularity_1;
124 int capacity_granularity_2;
125 int alarm;
126 char model_number[32];
127 char serial_number[32];
128 char type[32];
129 char oem_info[32];
130 int state;
131 int power_unit;
132 unsigned long flags;
133 };
134
135 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
136
137 inline int acpi_battery_present(struct acpi_battery *battery)
138 {
139 return battery->device->status.battery_present;
140 }
141
142 static int acpi_battery_technology(struct acpi_battery *battery)
143 {
144 if (!strcasecmp("NiCd", battery->type))
145 return POWER_SUPPLY_TECHNOLOGY_NiCd;
146 if (!strcasecmp("NiMH", battery->type))
147 return POWER_SUPPLY_TECHNOLOGY_NiMH;
148 if (!strcasecmp("LION", battery->type))
149 return POWER_SUPPLY_TECHNOLOGY_LION;
150 if (!strncasecmp("LI-ION", battery->type, 6))
151 return POWER_SUPPLY_TECHNOLOGY_LION;
152 if (!strcasecmp("LiP", battery->type))
153 return POWER_SUPPLY_TECHNOLOGY_LIPO;
154 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
155 }
156
157 static int acpi_battery_get_state(struct acpi_battery *battery);
158
159 static int acpi_battery_is_charged(struct acpi_battery *battery)
160 {
161 /* either charging or discharging */
162 if (battery->state != 0)
163 return 0;
164
165 /* battery not reporting charge */
166 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
167 battery->capacity_now == 0)
168 return 0;
169
170 /* good batteries update full_charge as the batteries degrade */
171 if (battery->full_charge_capacity == battery->capacity_now)
172 return 1;
173
174 /* fallback to using design values for broken batteries */
175 if (battery->design_capacity == battery->capacity_now)
176 return 1;
177
178 /* we don't do any sort of metric based on percentages */
179 return 0;
180 }
181
182 static int acpi_battery_get_property(struct power_supply *psy,
183 enum power_supply_property psp,
184 union power_supply_propval *val)
185 {
186 int ret = 0;
187 struct acpi_battery *battery = to_acpi_battery(psy);
188
189 if (acpi_battery_present(battery)) {
190 /* run battery update only if it is present */
191 acpi_battery_get_state(battery);
192 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
193 return -ENODEV;
194 switch (psp) {
195 case POWER_SUPPLY_PROP_STATUS:
196 if (battery->state & 0x01)
197 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
198 else if (battery->state & 0x02)
199 val->intval = POWER_SUPPLY_STATUS_CHARGING;
200 else if (acpi_battery_is_charged(battery))
201 val->intval = POWER_SUPPLY_STATUS_FULL;
202 else
203 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
204 break;
205 case POWER_SUPPLY_PROP_PRESENT:
206 val->intval = acpi_battery_present(battery);
207 break;
208 case POWER_SUPPLY_PROP_TECHNOLOGY:
209 val->intval = acpi_battery_technology(battery);
210 break;
211 case POWER_SUPPLY_PROP_CYCLE_COUNT:
212 val->intval = battery->cycle_count;
213 break;
214 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
215 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
216 ret = -ENODEV;
217 else
218 val->intval = battery->design_voltage * 1000;
219 break;
220 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
221 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
222 ret = -ENODEV;
223 else
224 val->intval = battery->voltage_now * 1000;
225 break;
226 case POWER_SUPPLY_PROP_CURRENT_NOW:
227 case POWER_SUPPLY_PROP_POWER_NOW:
228 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
229 ret = -ENODEV;
230 else
231 val->intval = battery->rate_now * 1000;
232 break;
233 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
234 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
235 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
236 ret = -ENODEV;
237 else
238 val->intval = battery->design_capacity * 1000;
239 break;
240 case POWER_SUPPLY_PROP_CHARGE_FULL:
241 case POWER_SUPPLY_PROP_ENERGY_FULL:
242 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
243 ret = -ENODEV;
244 else
245 val->intval = battery->full_charge_capacity * 1000;
246 break;
247 case POWER_SUPPLY_PROP_CHARGE_NOW:
248 case POWER_SUPPLY_PROP_ENERGY_NOW:
249 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
250 ret = -ENODEV;
251 else
252 val->intval = battery->capacity_now * 1000;
253 break;
254 case POWER_SUPPLY_PROP_MODEL_NAME:
255 val->strval = battery->model_number;
256 break;
257 case POWER_SUPPLY_PROP_MANUFACTURER:
258 val->strval = battery->oem_info;
259 break;
260 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
261 val->strval = battery->serial_number;
262 break;
263 default:
264 ret = -EINVAL;
265 }
266 return ret;
267 }
268
269 static enum power_supply_property charge_battery_props[] = {
270 POWER_SUPPLY_PROP_STATUS,
271 POWER_SUPPLY_PROP_PRESENT,
272 POWER_SUPPLY_PROP_TECHNOLOGY,
273 POWER_SUPPLY_PROP_CYCLE_COUNT,
274 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
275 POWER_SUPPLY_PROP_VOLTAGE_NOW,
276 POWER_SUPPLY_PROP_CURRENT_NOW,
277 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
278 POWER_SUPPLY_PROP_CHARGE_FULL,
279 POWER_SUPPLY_PROP_CHARGE_NOW,
280 POWER_SUPPLY_PROP_MODEL_NAME,
281 POWER_SUPPLY_PROP_MANUFACTURER,
282 POWER_SUPPLY_PROP_SERIAL_NUMBER,
283 };
284
285 static enum power_supply_property energy_battery_props[] = {
286 POWER_SUPPLY_PROP_STATUS,
287 POWER_SUPPLY_PROP_PRESENT,
288 POWER_SUPPLY_PROP_TECHNOLOGY,
289 POWER_SUPPLY_PROP_CYCLE_COUNT,
290 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
291 POWER_SUPPLY_PROP_VOLTAGE_NOW,
292 POWER_SUPPLY_PROP_POWER_NOW,
293 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
294 POWER_SUPPLY_PROP_ENERGY_FULL,
295 POWER_SUPPLY_PROP_ENERGY_NOW,
296 POWER_SUPPLY_PROP_MODEL_NAME,
297 POWER_SUPPLY_PROP_MANUFACTURER,
298 POWER_SUPPLY_PROP_SERIAL_NUMBER,
299 };
300
301 #ifdef CONFIG_ACPI_PROCFS_POWER
302 inline char *acpi_battery_units(struct acpi_battery *battery)
303 {
304 return (battery->power_unit)?"mA":"mW";
305 }
306 #endif
307
308 /* --------------------------------------------------------------------------
309 Battery Management
310 -------------------------------------------------------------------------- */
311 struct acpi_offsets {
312 size_t offset; /* offset inside struct acpi_sbs_battery */
313 u8 mode; /* int or string? */
314 };
315
316 static struct acpi_offsets state_offsets[] = {
317 {offsetof(struct acpi_battery, state), 0},
318 {offsetof(struct acpi_battery, rate_now), 0},
319 {offsetof(struct acpi_battery, capacity_now), 0},
320 {offsetof(struct acpi_battery, voltage_now), 0},
321 };
322
323 static struct acpi_offsets info_offsets[] = {
324 {offsetof(struct acpi_battery, power_unit), 0},
325 {offsetof(struct acpi_battery, design_capacity), 0},
326 {offsetof(struct acpi_battery, full_charge_capacity), 0},
327 {offsetof(struct acpi_battery, technology), 0},
328 {offsetof(struct acpi_battery, design_voltage), 0},
329 {offsetof(struct acpi_battery, design_capacity_warning), 0},
330 {offsetof(struct acpi_battery, design_capacity_low), 0},
331 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
332 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
333 {offsetof(struct acpi_battery, model_number), 1},
334 {offsetof(struct acpi_battery, serial_number), 1},
335 {offsetof(struct acpi_battery, type), 1},
336 {offsetof(struct acpi_battery, oem_info), 1},
337 };
338
339 static struct acpi_offsets extended_info_offsets[] = {
340 {offsetof(struct acpi_battery, power_unit), 0},
341 {offsetof(struct acpi_battery, design_capacity), 0},
342 {offsetof(struct acpi_battery, full_charge_capacity), 0},
343 {offsetof(struct acpi_battery, technology), 0},
344 {offsetof(struct acpi_battery, design_voltage), 0},
345 {offsetof(struct acpi_battery, design_capacity_warning), 0},
346 {offsetof(struct acpi_battery, design_capacity_low), 0},
347 {offsetof(struct acpi_battery, cycle_count), 0},
348 {offsetof(struct acpi_battery, measurement_accuracy), 0},
349 {offsetof(struct acpi_battery, max_sampling_time), 0},
350 {offsetof(struct acpi_battery, min_sampling_time), 0},
351 {offsetof(struct acpi_battery, max_averaging_interval), 0},
352 {offsetof(struct acpi_battery, min_averaging_interval), 0},
353 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
354 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
355 {offsetof(struct acpi_battery, model_number), 1},
356 {offsetof(struct acpi_battery, serial_number), 1},
357 {offsetof(struct acpi_battery, type), 1},
358 {offsetof(struct acpi_battery, oem_info), 1},
359 };
360
361 static int extract_package(struct acpi_battery *battery,
362 union acpi_object *package,
363 struct acpi_offsets *offsets, int num)
364 {
365 int i;
366 union acpi_object *element;
367 if (package->type != ACPI_TYPE_PACKAGE)
368 return -EFAULT;
369 for (i = 0; i < num; ++i) {
370 if (package->package.count <= i)
371 return -EFAULT;
372 element = &package->package.elements[i];
373 if (offsets[i].mode) {
374 u8 *ptr = (u8 *)battery + offsets[i].offset;
375 if (element->type == ACPI_TYPE_STRING ||
376 element->type == ACPI_TYPE_BUFFER)
377 strncpy(ptr, element->string.pointer, 32);
378 else if (element->type == ACPI_TYPE_INTEGER) {
379 strncpy(ptr, (u8 *)&element->integer.value,
380 sizeof(u64));
381 ptr[sizeof(u64)] = 0;
382 } else
383 *ptr = 0; /* don't have value */
384 } else {
385 int *x = (int *)((u8 *)battery + offsets[i].offset);
386 *x = (element->type == ACPI_TYPE_INTEGER) ?
387 element->integer.value : -1;
388 }
389 }
390 return 0;
391 }
392
393 static int acpi_battery_get_status(struct acpi_battery *battery)
394 {
395 if (acpi_bus_get_status(battery->device)) {
396 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
397 return -ENODEV;
398 }
399 return 0;
400 }
401
402 static int acpi_battery_get_info(struct acpi_battery *battery)
403 {
404 int result = -EFAULT;
405 acpi_status status = 0;
406 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
407 "_BIX" : "_BIF";
408
409 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
410
411 if (!acpi_battery_present(battery))
412 return 0;
413 mutex_lock(&battery->lock);
414 status = acpi_evaluate_object(battery->device->handle, name,
415 NULL, &buffer);
416 mutex_unlock(&battery->lock);
417
418 if (ACPI_FAILURE(status)) {
419 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
420 return -ENODEV;
421 }
422 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
423 result = extract_package(battery, buffer.pointer,
424 extended_info_offsets,
425 ARRAY_SIZE(extended_info_offsets));
426 else
427 result = extract_package(battery, buffer.pointer,
428 info_offsets, ARRAY_SIZE(info_offsets));
429 kfree(buffer.pointer);
430 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
431 battery->full_charge_capacity = battery->design_capacity;
432 return result;
433 }
434
435 static int acpi_battery_get_state(struct acpi_battery *battery)
436 {
437 int result = 0;
438 acpi_status status = 0;
439 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
440
441 if (!acpi_battery_present(battery))
442 return 0;
443
444 if (battery->update_time &&
445 time_before(jiffies, battery->update_time +
446 msecs_to_jiffies(cache_time)))
447 return 0;
448
449 mutex_lock(&battery->lock);
450 status = acpi_evaluate_object(battery->device->handle, "_BST",
451 NULL, &buffer);
452 mutex_unlock(&battery->lock);
453
454 if (ACPI_FAILURE(status)) {
455 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
456 return -ENODEV;
457 }
458
459 result = extract_package(battery, buffer.pointer,
460 state_offsets, ARRAY_SIZE(state_offsets));
461 battery->update_time = jiffies;
462 kfree(buffer.pointer);
463
464 if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
465 battery->rate_now != -1)
466 battery->rate_now = abs((s16)battery->rate_now);
467
468 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
469 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
470 battery->capacity_now = (battery->capacity_now *
471 battery->full_charge_capacity) / 100;
472 return result;
473 }
474
475 static int acpi_battery_set_alarm(struct acpi_battery *battery)
476 {
477 acpi_status status = 0;
478 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
479 struct acpi_object_list arg_list = { 1, &arg0 };
480
481 if (!acpi_battery_present(battery) ||
482 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
483 return -ENODEV;
484
485 arg0.integer.value = battery->alarm;
486
487 mutex_lock(&battery->lock);
488 status = acpi_evaluate_object(battery->device->handle, "_BTP",
489 &arg_list, NULL);
490 mutex_unlock(&battery->lock);
491
492 if (ACPI_FAILURE(status))
493 return -ENODEV;
494
495 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
496 return 0;
497 }
498
499 static int acpi_battery_init_alarm(struct acpi_battery *battery)
500 {
501 acpi_status status = AE_OK;
502 acpi_handle handle = NULL;
503
504 /* See if alarms are supported, and if so, set default */
505 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
506 if (ACPI_FAILURE(status)) {
507 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
508 return 0;
509 }
510 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
511 if (!battery->alarm)
512 battery->alarm = battery->design_capacity_warning;
513 return acpi_battery_set_alarm(battery);
514 }
515
516 static ssize_t acpi_battery_alarm_show(struct device *dev,
517 struct device_attribute *attr,
518 char *buf)
519 {
520 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
521 return sprintf(buf, "%d\n", battery->alarm * 1000);
522 }
523
524 static ssize_t acpi_battery_alarm_store(struct device *dev,
525 struct device_attribute *attr,
526 const char *buf, size_t count)
527 {
528 unsigned long x;
529 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
530 if (sscanf(buf, "%ld\n", &x) == 1)
531 battery->alarm = x/1000;
532 if (acpi_battery_present(battery))
533 acpi_battery_set_alarm(battery);
534 return count;
535 }
536
537 static struct device_attribute alarm_attr = {
538 .attr = {.name = "alarm", .mode = 0644},
539 .show = acpi_battery_alarm_show,
540 .store = acpi_battery_alarm_store,
541 };
542
543 static int sysfs_add_battery(struct acpi_battery *battery)
544 {
545 int result;
546
547 if (battery->power_unit) {
548 battery->bat.properties = charge_battery_props;
549 battery->bat.num_properties =
550 ARRAY_SIZE(charge_battery_props);
551 } else {
552 battery->bat.properties = energy_battery_props;
553 battery->bat.num_properties =
554 ARRAY_SIZE(energy_battery_props);
555 }
556
557 battery->bat.name = acpi_device_bid(battery->device);
558 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
559 battery->bat.get_property = acpi_battery_get_property;
560
561 result = power_supply_register(&battery->device->dev, &battery->bat);
562 if (result)
563 return result;
564 return device_create_file(battery->bat.dev, &alarm_attr);
565 }
566
567 static void sysfs_remove_battery(struct acpi_battery *battery)
568 {
569 if (!battery->bat.dev)
570 return;
571 device_remove_file(battery->bat.dev, &alarm_attr);
572 power_supply_unregister(&battery->bat);
573 battery->bat.dev = NULL;
574 }
575
576 static void acpi_battery_quirks(struct acpi_battery *battery)
577 {
578 if (dmi_name_in_vendors("Acer") && battery->power_unit) {
579 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
580 }
581 }
582
583 /*
584 * According to the ACPI spec, some kinds of primary batteries can
585 * report percentage battery remaining capacity directly to OS.
586 * In this case, it reports the Last Full Charged Capacity == 100
587 * and BatteryPresentRate == 0xFFFFFFFF.
588 *
589 * Now we found some battery reports percentage remaining capacity
590 * even if it's rechargeable.
591 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
592 *
593 * Handle this correctly so that they won't break userspace.
594 */
595 static void acpi_battery_quirks2(struct acpi_battery *battery)
596 {
597 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
598 return ;
599
600 if (battery->full_charge_capacity == 100 &&
601 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
602 battery->capacity_now >=0 && battery->capacity_now <= 100) {
603 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
604 battery->full_charge_capacity = battery->design_capacity;
605 battery->capacity_now = (battery->capacity_now *
606 battery->full_charge_capacity) / 100;
607 }
608 }
609
610 static int acpi_battery_update(struct acpi_battery *battery)
611 {
612 int result, old_present = acpi_battery_present(battery);
613 result = acpi_battery_get_status(battery);
614 if (result)
615 return result;
616 if (!acpi_battery_present(battery)) {
617 sysfs_remove_battery(battery);
618 battery->update_time = 0;
619 return 0;
620 }
621 if (!battery->update_time ||
622 old_present != acpi_battery_present(battery)) {
623 result = acpi_battery_get_info(battery);
624 if (result)
625 return result;
626 acpi_battery_quirks(battery);
627 acpi_battery_init_alarm(battery);
628 }
629 if (!battery->bat.dev)
630 sysfs_add_battery(battery);
631 result = acpi_battery_get_state(battery);
632 acpi_battery_quirks2(battery);
633 return result;
634 }
635
636 static void acpi_battery_refresh(struct acpi_battery *battery)
637 {
638 if (!battery->bat.dev)
639 return;
640
641 acpi_battery_get_info(battery);
642 /* The battery may have changed its reporting units. */
643 sysfs_remove_battery(battery);
644 sysfs_add_battery(battery);
645 }
646
647 /* --------------------------------------------------------------------------
648 FS Interface (/proc)
649 -------------------------------------------------------------------------- */
650
651 #ifdef CONFIG_ACPI_PROCFS_POWER
652 static struct proc_dir_entry *acpi_battery_dir;
653
654 static int acpi_battery_print_info(struct seq_file *seq, int result)
655 {
656 struct acpi_battery *battery = seq->private;
657
658 if (result)
659 goto end;
660
661 seq_printf(seq, "present: %s\n",
662 acpi_battery_present(battery)?"yes":"no");
663 if (!acpi_battery_present(battery))
664 goto end;
665 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
666 seq_printf(seq, "design capacity: unknown\n");
667 else
668 seq_printf(seq, "design capacity: %d %sh\n",
669 battery->design_capacity,
670 acpi_battery_units(battery));
671
672 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
673 seq_printf(seq, "last full capacity: unknown\n");
674 else
675 seq_printf(seq, "last full capacity: %d %sh\n",
676 battery->full_charge_capacity,
677 acpi_battery_units(battery));
678
679 seq_printf(seq, "battery technology: %srechargeable\n",
680 (!battery->technology)?"non-":"");
681
682 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
683 seq_printf(seq, "design voltage: unknown\n");
684 else
685 seq_printf(seq, "design voltage: %d mV\n",
686 battery->design_voltage);
687 seq_printf(seq, "design capacity warning: %d %sh\n",
688 battery->design_capacity_warning,
689 acpi_battery_units(battery));
690 seq_printf(seq, "design capacity low: %d %sh\n",
691 battery->design_capacity_low,
692 acpi_battery_units(battery));
693 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
694 seq_printf(seq, "capacity granularity 1: %d %sh\n",
695 battery->capacity_granularity_1,
696 acpi_battery_units(battery));
697 seq_printf(seq, "capacity granularity 2: %d %sh\n",
698 battery->capacity_granularity_2,
699 acpi_battery_units(battery));
700 seq_printf(seq, "model number: %s\n", battery->model_number);
701 seq_printf(seq, "serial number: %s\n", battery->serial_number);
702 seq_printf(seq, "battery type: %s\n", battery->type);
703 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
704 end:
705 if (result)
706 seq_printf(seq, "ERROR: Unable to read battery info\n");
707 return result;
708 }
709
710 static int acpi_battery_print_state(struct seq_file *seq, int result)
711 {
712 struct acpi_battery *battery = seq->private;
713
714 if (result)
715 goto end;
716
717 seq_printf(seq, "present: %s\n",
718 acpi_battery_present(battery)?"yes":"no");
719 if (!acpi_battery_present(battery))
720 goto end;
721
722 seq_printf(seq, "capacity state: %s\n",
723 (battery->state & 0x04)?"critical":"ok");
724 if ((battery->state & 0x01) && (battery->state & 0x02))
725 seq_printf(seq,
726 "charging state: charging/discharging\n");
727 else if (battery->state & 0x01)
728 seq_printf(seq, "charging state: discharging\n");
729 else if (battery->state & 0x02)
730 seq_printf(seq, "charging state: charging\n");
731 else
732 seq_printf(seq, "charging state: charged\n");
733
734 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
735 seq_printf(seq, "present rate: unknown\n");
736 else
737 seq_printf(seq, "present rate: %d %s\n",
738 battery->rate_now, acpi_battery_units(battery));
739
740 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
741 seq_printf(seq, "remaining capacity: unknown\n");
742 else
743 seq_printf(seq, "remaining capacity: %d %sh\n",
744 battery->capacity_now, acpi_battery_units(battery));
745 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
746 seq_printf(seq, "present voltage: unknown\n");
747 else
748 seq_printf(seq, "present voltage: %d mV\n",
749 battery->voltage_now);
750 end:
751 if (result)
752 seq_printf(seq, "ERROR: Unable to read battery state\n");
753
754 return result;
755 }
756
757 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
758 {
759 struct acpi_battery *battery = seq->private;
760
761 if (result)
762 goto end;
763
764 if (!acpi_battery_present(battery)) {
765 seq_printf(seq, "present: no\n");
766 goto end;
767 }
768 seq_printf(seq, "alarm: ");
769 if (!battery->alarm)
770 seq_printf(seq, "unsupported\n");
771 else
772 seq_printf(seq, "%u %sh\n", battery->alarm,
773 acpi_battery_units(battery));
774 end:
775 if (result)
776 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
777 return result;
778 }
779
780 static ssize_t acpi_battery_write_alarm(struct file *file,
781 const char __user * buffer,
782 size_t count, loff_t * ppos)
783 {
784 int result = 0;
785 char alarm_string[12] = { '\0' };
786 struct seq_file *m = file->private_data;
787 struct acpi_battery *battery = m->private;
788
789 if (!battery || (count > sizeof(alarm_string) - 1))
790 return -EINVAL;
791 if (!acpi_battery_present(battery)) {
792 result = -ENODEV;
793 goto end;
794 }
795 if (copy_from_user(alarm_string, buffer, count)) {
796 result = -EFAULT;
797 goto end;
798 }
799 alarm_string[count] = '\0';
800 battery->alarm = simple_strtol(alarm_string, NULL, 0);
801 result = acpi_battery_set_alarm(battery);
802 end:
803 if (!result)
804 return count;
805 return result;
806 }
807
808 typedef int(*print_func)(struct seq_file *seq, int result);
809
810 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
811 acpi_battery_print_info,
812 acpi_battery_print_state,
813 acpi_battery_print_alarm,
814 };
815
816 static int acpi_battery_read(int fid, struct seq_file *seq)
817 {
818 struct acpi_battery *battery = seq->private;
819 int result = acpi_battery_update(battery);
820 return acpi_print_funcs[fid](seq, result);
821 }
822
823 #define DECLARE_FILE_FUNCTIONS(_name) \
824 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
825 { \
826 return acpi_battery_read(_name##_tag, seq); \
827 } \
828 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
829 { \
830 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
831 }
832
833 DECLARE_FILE_FUNCTIONS(info);
834 DECLARE_FILE_FUNCTIONS(state);
835 DECLARE_FILE_FUNCTIONS(alarm);
836
837 #undef DECLARE_FILE_FUNCTIONS
838
839 #define FILE_DESCRIPTION_RO(_name) \
840 { \
841 .name = __stringify(_name), \
842 .mode = S_IRUGO, \
843 .ops = { \
844 .open = acpi_battery_##_name##_open_fs, \
845 .read = seq_read, \
846 .llseek = seq_lseek, \
847 .release = single_release, \
848 .owner = THIS_MODULE, \
849 }, \
850 }
851
852 #define FILE_DESCRIPTION_RW(_name) \
853 { \
854 .name = __stringify(_name), \
855 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
856 .ops = { \
857 .open = acpi_battery_##_name##_open_fs, \
858 .read = seq_read, \
859 .llseek = seq_lseek, \
860 .write = acpi_battery_write_##_name, \
861 .release = single_release, \
862 .owner = THIS_MODULE, \
863 }, \
864 }
865
866 static struct battery_file {
867 struct file_operations ops;
868 mode_t mode;
869 const char *name;
870 } acpi_battery_file[] = {
871 FILE_DESCRIPTION_RO(info),
872 FILE_DESCRIPTION_RO(state),
873 FILE_DESCRIPTION_RW(alarm),
874 };
875
876 #undef FILE_DESCRIPTION_RO
877 #undef FILE_DESCRIPTION_RW
878
879 static int acpi_battery_add_fs(struct acpi_device *device)
880 {
881 struct proc_dir_entry *entry = NULL;
882 int i;
883
884 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
885 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
886 if (!acpi_device_dir(device)) {
887 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
888 acpi_battery_dir);
889 if (!acpi_device_dir(device))
890 return -ENODEV;
891 }
892
893 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
894 entry = proc_create_data(acpi_battery_file[i].name,
895 acpi_battery_file[i].mode,
896 acpi_device_dir(device),
897 &acpi_battery_file[i].ops,
898 acpi_driver_data(device));
899 if (!entry)
900 return -ENODEV;
901 }
902 return 0;
903 }
904
905 static void acpi_battery_remove_fs(struct acpi_device *device)
906 {
907 int i;
908 if (!acpi_device_dir(device))
909 return;
910 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
911 remove_proc_entry(acpi_battery_file[i].name,
912 acpi_device_dir(device));
913
914 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
915 acpi_device_dir(device) = NULL;
916 }
917
918 #endif
919
920 /* --------------------------------------------------------------------------
921 Driver Interface
922 -------------------------------------------------------------------------- */
923
924 static void acpi_battery_notify(struct acpi_device *device, u32 event)
925 {
926 struct acpi_battery *battery = acpi_driver_data(device);
927 struct device *old;
928
929 if (!battery)
930 return;
931 old = battery->bat.dev;
932 if (event == ACPI_BATTERY_NOTIFY_INFO)
933 acpi_battery_refresh(battery);
934 acpi_battery_update(battery);
935 acpi_bus_generate_proc_event(device, event,
936 acpi_battery_present(battery));
937 acpi_bus_generate_netlink_event(device->pnp.device_class,
938 dev_name(&device->dev), event,
939 acpi_battery_present(battery));
940 /* acpi_battery_update could remove power_supply object */
941 if (old && battery->bat.dev)
942 power_supply_changed(&battery->bat);
943 }
944
945 static int battery_notify(struct notifier_block *nb,
946 unsigned long mode, void *_unused)
947 {
948 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
949 pm_nb);
950 switch (mode) {
951 case PM_POST_SUSPEND:
952 sysfs_remove_battery(battery);
953 sysfs_add_battery(battery);
954 break;
955 }
956
957 return 0;
958 }
959
960 static int acpi_battery_add(struct acpi_device *device)
961 {
962 int result = 0;
963 struct acpi_battery *battery = NULL;
964 acpi_handle handle;
965 if (!device)
966 return -EINVAL;
967 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
968 if (!battery)
969 return -ENOMEM;
970 battery->device = device;
971 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
972 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
973 device->driver_data = battery;
974 mutex_init(&battery->lock);
975 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
976 "_BIX", &handle)))
977 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
978 acpi_battery_update(battery);
979 #ifdef CONFIG_ACPI_PROCFS_POWER
980 result = acpi_battery_add_fs(device);
981 #endif
982 if (!result) {
983 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
984 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
985 device->status.battery_present ? "present" : "absent");
986 } else {
987 #ifdef CONFIG_ACPI_PROCFS_POWER
988 acpi_battery_remove_fs(device);
989 #endif
990 kfree(battery);
991 }
992
993 battery->pm_nb.notifier_call = battery_notify;
994 register_pm_notifier(&battery->pm_nb);
995
996 return result;
997 }
998
999 static int acpi_battery_remove(struct acpi_device *device, int type)
1000 {
1001 struct acpi_battery *battery = NULL;
1002
1003 if (!device || !acpi_driver_data(device))
1004 return -EINVAL;
1005 battery = acpi_driver_data(device);
1006 unregister_pm_notifier(&battery->pm_nb);
1007 #ifdef CONFIG_ACPI_PROCFS_POWER
1008 acpi_battery_remove_fs(device);
1009 #endif
1010 sysfs_remove_battery(battery);
1011 mutex_destroy(&battery->lock);
1012 kfree(battery);
1013 return 0;
1014 }
1015
1016 /* this is needed to learn about changes made in suspended state */
1017 static int acpi_battery_resume(struct acpi_device *device)
1018 {
1019 struct acpi_battery *battery;
1020 if (!device)
1021 return -EINVAL;
1022 battery = acpi_driver_data(device);
1023 battery->update_time = 0;
1024 acpi_battery_update(battery);
1025 return 0;
1026 }
1027
1028 static struct acpi_driver acpi_battery_driver = {
1029 .name = "battery",
1030 .class = ACPI_BATTERY_CLASS,
1031 .ids = battery_device_ids,
1032 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1033 .ops = {
1034 .add = acpi_battery_add,
1035 .resume = acpi_battery_resume,
1036 .remove = acpi_battery_remove,
1037 .notify = acpi_battery_notify,
1038 },
1039 };
1040
1041 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1042 {
1043 if (acpi_disabled)
1044 return;
1045 #ifdef CONFIG_ACPI_PROCFS_POWER
1046 acpi_battery_dir = acpi_lock_battery_dir();
1047 if (!acpi_battery_dir)
1048 return;
1049 #endif
1050 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1051 #ifdef CONFIG_ACPI_PROCFS_POWER
1052 acpi_unlock_battery_dir(acpi_battery_dir);
1053 #endif
1054 return;
1055 }
1056 return;
1057 }
1058
1059 static int __init acpi_battery_init(void)
1060 {
1061 async_schedule(acpi_battery_init_async, NULL);
1062 return 0;
1063 }
1064
1065 static void __exit acpi_battery_exit(void)
1066 {
1067 acpi_bus_unregister_driver(&acpi_battery_driver);
1068 #ifdef CONFIG_ACPI_PROCFS_POWER
1069 acpi_unlock_battery_dir(acpi_battery_dir);
1070 #endif
1071 }
1072
1073 module_init(acpi_battery_init);
1074 module_exit(acpi_battery_exit);
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