projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
ACPI / Battery: Add the power unit macro
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / battery.c
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 /* Battery power unit: 0 means mW, 1 means mA */
59 #define ACPI_BATTERY_POWER_UNIT_MA 1
60
61 #define _COMPONENT ACPI_BATTERY_COMPONENT
62
63 ACPI_MODULE_NAME("battery");
64
65 MODULE_AUTHOR("Paul Diefenbaugh");
66 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
67 MODULE_DESCRIPTION("ACPI Battery Driver");
68 MODULE_LICENSE("GPL");
69
70 static unsigned int cache_time = 1000;
71 module_param(cache_time, uint, 0644);
72 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
73
74 #ifdef CONFIG_ACPI_PROCFS_POWER
75 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
76 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
77
78 enum acpi_battery_files {
79 info_tag = 0,
80 state_tag,
81 alarm_tag,
82 ACPI_BATTERY_NUMFILES,
83 };
84
85 #endif
86
87 static const struct acpi_device_id battery_device_ids[] = {
88 {"PNP0C0A", 0},
89 {"", 0},
90 };
91
92 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
93
94 enum {
95 ACPI_BATTERY_ALARM_PRESENT,
96 ACPI_BATTERY_XINFO_PRESENT,
97 /* For buggy DSDTs that report negative 16-bit values for either
98 * charging or discharging current and/or report 0 as 65536
99 * due to bad math.
100 */
101 ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
102 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
103 };
104
105 struct acpi_battery {
106 struct mutex lock;
107 struct power_supply bat;
108 struct acpi_device *device;
109 struct notifier_block pm_nb;
110 unsigned long update_time;
111 int rate_now;
112 int capacity_now;
113 int voltage_now;
114 int design_capacity;
115 int full_charge_capacity;
116 int technology;
117 int design_voltage;
118 int design_capacity_warning;
119 int design_capacity_low;
120 int cycle_count;
121 int measurement_accuracy;
122 int max_sampling_time;
123 int min_sampling_time;
124 int max_averaging_interval;
125 int min_averaging_interval;
126 int capacity_granularity_1;
127 int capacity_granularity_2;
128 int alarm;
129 char model_number[32];
130 char serial_number[32];
131 char type[32];
132 char oem_info[32];
133 int state;
134 int power_unit;
135 unsigned long flags;
136 };
137
138 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
139
140 inline int acpi_battery_present(struct acpi_battery *battery)
141 {
142 return battery->device->status.battery_present;
143 }
144
145 static int acpi_battery_technology(struct acpi_battery *battery)
146 {
147 if (!strcasecmp("NiCd", battery->type))
148 return POWER_SUPPLY_TECHNOLOGY_NiCd;
149 if (!strcasecmp("NiMH", battery->type))
150 return POWER_SUPPLY_TECHNOLOGY_NiMH;
151 if (!strcasecmp("LION", battery->type))
152 return POWER_SUPPLY_TECHNOLOGY_LION;
153 if (!strncasecmp("LI-ION", battery->type, 6))
154 return POWER_SUPPLY_TECHNOLOGY_LION;
155 if (!strcasecmp("LiP", battery->type))
156 return POWER_SUPPLY_TECHNOLOGY_LIPO;
157 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
158 }
159
160 static int acpi_battery_get_state(struct acpi_battery *battery);
161
162 static int acpi_battery_is_charged(struct acpi_battery *battery)
163 {
164 /* either charging or discharging */
165 if (battery->state != 0)
166 return 0;
167
168 /* battery not reporting charge */
169 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
170 battery->capacity_now == 0)
171 return 0;
172
173 /* good batteries update full_charge as the batteries degrade */
174 if (battery->full_charge_capacity == battery->capacity_now)
175 return 1;
176
177 /* fallback to using design values for broken batteries */
178 if (battery->design_capacity == battery->capacity_now)
179 return 1;
180
181 /* we don't do any sort of metric based on percentages */
182 return 0;
183 }
184
185 static int acpi_battery_get_property(struct power_supply *psy,
186 enum power_supply_property psp,
187 union power_supply_propval *val)
188 {
189 int ret = 0;
190 struct acpi_battery *battery = to_acpi_battery(psy);
191
192 if (acpi_battery_present(battery)) {
193 /* run battery update only if it is present */
194 acpi_battery_get_state(battery);
195 } else if (psp != POWER_SUPPLY_PROP_PRESENT)
196 return -ENODEV;
197 switch (psp) {
198 case POWER_SUPPLY_PROP_STATUS:
199 if (battery->state & 0x01)
200 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
201 else if (battery->state & 0x02)
202 val->intval = POWER_SUPPLY_STATUS_CHARGING;
203 else if (acpi_battery_is_charged(battery))
204 val->intval = POWER_SUPPLY_STATUS_FULL;
205 else
206 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
207 break;
208 case POWER_SUPPLY_PROP_PRESENT:
209 val->intval = acpi_battery_present(battery);
210 break;
211 case POWER_SUPPLY_PROP_TECHNOLOGY:
212 val->intval = acpi_battery_technology(battery);
213 break;
214 case POWER_SUPPLY_PROP_CYCLE_COUNT:
215 val->intval = battery->cycle_count;
216 break;
217 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
218 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
219 ret = -ENODEV;
220 else
221 val->intval = battery->design_voltage * 1000;
222 break;
223 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
224 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
225 ret = -ENODEV;
226 else
227 val->intval = battery->voltage_now * 1000;
228 break;
229 case POWER_SUPPLY_PROP_CURRENT_NOW:
230 case POWER_SUPPLY_PROP_POWER_NOW:
231 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
232 ret = -ENODEV;
233 else
234 val->intval = battery->rate_now * 1000;
235 break;
236 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
237 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
238 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
239 ret = -ENODEV;
240 else
241 val->intval = battery->design_capacity * 1000;
242 break;
243 case POWER_SUPPLY_PROP_CHARGE_FULL:
244 case POWER_SUPPLY_PROP_ENERGY_FULL:
245 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
246 ret = -ENODEV;
247 else
248 val->intval = battery->full_charge_capacity * 1000;
249 break;
250 case POWER_SUPPLY_PROP_CHARGE_NOW:
251 case POWER_SUPPLY_PROP_ENERGY_NOW:
252 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
253 ret = -ENODEV;
254 else
255 val->intval = battery->capacity_now * 1000;
256 break;
257 case POWER_SUPPLY_PROP_MODEL_NAME:
258 val->strval = battery->model_number;
259 break;
260 case POWER_SUPPLY_PROP_MANUFACTURER:
261 val->strval = battery->oem_info;
262 break;
263 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
264 val->strval = battery->serial_number;
265 break;
266 default:
267 ret = -EINVAL;
268 }
269 return ret;
270 }
271
272 static enum power_supply_property charge_battery_props[] = {
273 POWER_SUPPLY_PROP_STATUS,
274 POWER_SUPPLY_PROP_PRESENT,
275 POWER_SUPPLY_PROP_TECHNOLOGY,
276 POWER_SUPPLY_PROP_CYCLE_COUNT,
277 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
278 POWER_SUPPLY_PROP_VOLTAGE_NOW,
279 POWER_SUPPLY_PROP_CURRENT_NOW,
280 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
281 POWER_SUPPLY_PROP_CHARGE_FULL,
282 POWER_SUPPLY_PROP_CHARGE_NOW,
283 POWER_SUPPLY_PROP_MODEL_NAME,
284 POWER_SUPPLY_PROP_MANUFACTURER,
285 POWER_SUPPLY_PROP_SERIAL_NUMBER,
286 };
287
288 static enum power_supply_property energy_battery_props[] = {
289 POWER_SUPPLY_PROP_STATUS,
290 POWER_SUPPLY_PROP_PRESENT,
291 POWER_SUPPLY_PROP_TECHNOLOGY,
292 POWER_SUPPLY_PROP_CYCLE_COUNT,
293 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
294 POWER_SUPPLY_PROP_VOLTAGE_NOW,
295 POWER_SUPPLY_PROP_POWER_NOW,
296 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
297 POWER_SUPPLY_PROP_ENERGY_FULL,
298 POWER_SUPPLY_PROP_ENERGY_NOW,
299 POWER_SUPPLY_PROP_MODEL_NAME,
300 POWER_SUPPLY_PROP_MANUFACTURER,
301 POWER_SUPPLY_PROP_SERIAL_NUMBER,
302 };
303
304 #ifdef CONFIG_ACPI_PROCFS_POWER
305 inline char *acpi_battery_units(struct acpi_battery *battery)
306 {
307 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
308 "mA" : "mW";
309 }
310 #endif
311
312 /* --------------------------------------------------------------------------
313 Battery Management
314 -------------------------------------------------------------------------- */
315 struct acpi_offsets {
316 size_t offset; /* offset inside struct acpi_sbs_battery */
317 u8 mode; /* int or string? */
318 };
319
320 static struct acpi_offsets state_offsets[] = {
321 {offsetof(struct acpi_battery, state), 0},
322 {offsetof(struct acpi_battery, rate_now), 0},
323 {offsetof(struct acpi_battery, capacity_now), 0},
324 {offsetof(struct acpi_battery, voltage_now), 0},
325 };
326
327 static struct acpi_offsets info_offsets[] = {
328 {offsetof(struct acpi_battery, power_unit), 0},
329 {offsetof(struct acpi_battery, design_capacity), 0},
330 {offsetof(struct acpi_battery, full_charge_capacity), 0},
331 {offsetof(struct acpi_battery, technology), 0},
332 {offsetof(struct acpi_battery, design_voltage), 0},
333 {offsetof(struct acpi_battery, design_capacity_warning), 0},
334 {offsetof(struct acpi_battery, design_capacity_low), 0},
335 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
336 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
337 {offsetof(struct acpi_battery, model_number), 1},
338 {offsetof(struct acpi_battery, serial_number), 1},
339 {offsetof(struct acpi_battery, type), 1},
340 {offsetof(struct acpi_battery, oem_info), 1},
341 };
342
343 static struct acpi_offsets extended_info_offsets[] = {
344 {offsetof(struct acpi_battery, power_unit), 0},
345 {offsetof(struct acpi_battery, design_capacity), 0},
346 {offsetof(struct acpi_battery, full_charge_capacity), 0},
347 {offsetof(struct acpi_battery, technology), 0},
348 {offsetof(struct acpi_battery, design_voltage), 0},
349 {offsetof(struct acpi_battery, design_capacity_warning), 0},
350 {offsetof(struct acpi_battery, design_capacity_low), 0},
351 {offsetof(struct acpi_battery, cycle_count), 0},
352 {offsetof(struct acpi_battery, measurement_accuracy), 0},
353 {offsetof(struct acpi_battery, max_sampling_time), 0},
354 {offsetof(struct acpi_battery, min_sampling_time), 0},
355 {offsetof(struct acpi_battery, max_averaging_interval), 0},
356 {offsetof(struct acpi_battery, min_averaging_interval), 0},
357 {offsetof(struct acpi_battery, capacity_granularity_1), 0},
358 {offsetof(struct acpi_battery, capacity_granularity_2), 0},
359 {offsetof(struct acpi_battery, model_number), 1},
360 {offsetof(struct acpi_battery, serial_number), 1},
361 {offsetof(struct acpi_battery, type), 1},
362 {offsetof(struct acpi_battery, oem_info), 1},
363 };
364
365 static int extract_package(struct acpi_battery *battery,
366 union acpi_object *package,
367 struct acpi_offsets *offsets, int num)
368 {
369 int i;
370 union acpi_object *element;
371 if (package->type != ACPI_TYPE_PACKAGE)
372 return -EFAULT;
373 for (i = 0; i < num; ++i) {
374 if (package->package.count <= i)
375 return -EFAULT;
376 element = &package->package.elements[i];
377 if (offsets[i].mode) {
378 u8 *ptr = (u8 *)battery + offsets[i].offset;
379 if (element->type == ACPI_TYPE_STRING ||
380 element->type == ACPI_TYPE_BUFFER)
381 strncpy(ptr, element->string.pointer, 32);
382 else if (element->type == ACPI_TYPE_INTEGER) {
383 strncpy(ptr, (u8 *)&element->integer.value,
384 sizeof(u64));
385 ptr[sizeof(u64)] = 0;
386 } else
387 *ptr = 0; /* don't have value */
388 } else {
389 int *x = (int *)((u8 *)battery + offsets[i].offset);
390 *x = (element->type == ACPI_TYPE_INTEGER) ?
391 element->integer.value : -1;
392 }
393 }
394 return 0;
395 }
396
397 static int acpi_battery_get_status(struct acpi_battery *battery)
398 {
399 if (acpi_bus_get_status(battery->device)) {
400 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
401 return -ENODEV;
402 }
403 return 0;
404 }
405
406 static int acpi_battery_get_info(struct acpi_battery *battery)
407 {
408 int result = -EFAULT;
409 acpi_status status = 0;
410 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
411 "_BIX" : "_BIF";
412
413 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
414
415 if (!acpi_battery_present(battery))
416 return 0;
417 mutex_lock(&battery->lock);
418 status = acpi_evaluate_object(battery->device->handle, name,
419 NULL, &buffer);
420 mutex_unlock(&battery->lock);
421
422 if (ACPI_FAILURE(status)) {
423 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
424 return -ENODEV;
425 }
426 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
427 result = extract_package(battery, buffer.pointer,
428 extended_info_offsets,
429 ARRAY_SIZE(extended_info_offsets));
430 else
431 result = extract_package(battery, buffer.pointer,
432 info_offsets, ARRAY_SIZE(info_offsets));
433 kfree(buffer.pointer);
434 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
435 battery->full_charge_capacity = battery->design_capacity;
436 return result;
437 }
438
439 static int acpi_battery_get_state(struct acpi_battery *battery)
440 {
441 int result = 0;
442 acpi_status status = 0;
443 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
444
445 if (!acpi_battery_present(battery))
446 return 0;
447
448 if (battery->update_time &&
449 time_before(jiffies, battery->update_time +
450 msecs_to_jiffies(cache_time)))
451 return 0;
452
453 mutex_lock(&battery->lock);
454 status = acpi_evaluate_object(battery->device->handle, "_BST",
455 NULL, &buffer);
456 mutex_unlock(&battery->lock);
457
458 if (ACPI_FAILURE(status)) {
459 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
460 return -ENODEV;
461 }
462
463 result = extract_package(battery, buffer.pointer,
464 state_offsets, ARRAY_SIZE(state_offsets));
465 battery->update_time = jiffies;
466 kfree(buffer.pointer);
467
468 if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
469 battery->rate_now != -1)
470 battery->rate_now = abs((s16)battery->rate_now);
471
472 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
473 && battery->capacity_now >= 0 && battery->capacity_now <= 100)
474 battery->capacity_now = (battery->capacity_now *
475 battery->full_charge_capacity) / 100;
476 return result;
477 }
478
479 static int acpi_battery_set_alarm(struct acpi_battery *battery)
480 {
481 acpi_status status = 0;
482 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
483 struct acpi_object_list arg_list = { 1, &arg0 };
484
485 if (!acpi_battery_present(battery) ||
486 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
487 return -ENODEV;
488
489 arg0.integer.value = battery->alarm;
490
491 mutex_lock(&battery->lock);
492 status = acpi_evaluate_object(battery->device->handle, "_BTP",
493 &arg_list, NULL);
494 mutex_unlock(&battery->lock);
495
496 if (ACPI_FAILURE(status))
497 return -ENODEV;
498
499 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
500 return 0;
501 }
502
503 static int acpi_battery_init_alarm(struct acpi_battery *battery)
504 {
505 acpi_status status = AE_OK;
506 acpi_handle handle = NULL;
507
508 /* See if alarms are supported, and if so, set default */
509 status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
510 if (ACPI_FAILURE(status)) {
511 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
512 return 0;
513 }
514 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
515 if (!battery->alarm)
516 battery->alarm = battery->design_capacity_warning;
517 return acpi_battery_set_alarm(battery);
518 }
519
520 static ssize_t acpi_battery_alarm_show(struct device *dev,
521 struct device_attribute *attr,
522 char *buf)
523 {
524 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
525 return sprintf(buf, "%d\n", battery->alarm * 1000);
526 }
527
528 static ssize_t acpi_battery_alarm_store(struct device *dev,
529 struct device_attribute *attr,
530 const char *buf, size_t count)
531 {
532 unsigned long x;
533 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
534 if (sscanf(buf, "%ld\n", &x) == 1)
535 battery->alarm = x/1000;
536 if (acpi_battery_present(battery))
537 acpi_battery_set_alarm(battery);
538 return count;
539 }
540
541 static struct device_attribute alarm_attr = {
542 .attr = {.name = "alarm", .mode = 0644},
543 .show = acpi_battery_alarm_show,
544 .store = acpi_battery_alarm_store,
545 };
546
547 static int sysfs_add_battery(struct acpi_battery *battery)
548 {
549 int result;
550
551 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
552 battery->bat.properties = charge_battery_props;
553 battery->bat.num_properties =
554 ARRAY_SIZE(charge_battery_props);
555 } else {
556 battery->bat.properties = energy_battery_props;
557 battery->bat.num_properties =
558 ARRAY_SIZE(energy_battery_props);
559 }
560
561 battery->bat.name = acpi_device_bid(battery->device);
562 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
563 battery->bat.get_property = acpi_battery_get_property;
564
565 result = power_supply_register(&battery->device->dev, &battery->bat);
566 if (result)
567 return result;
568 return device_create_file(battery->bat.dev, &alarm_attr);
569 }
570
571 static void sysfs_remove_battery(struct acpi_battery *battery)
572 {
573 if (!battery->bat.dev)
574 return;
575 device_remove_file(battery->bat.dev, &alarm_attr);
576 power_supply_unregister(&battery->bat);
577 battery->bat.dev = NULL;
578 }
579
580 static void acpi_battery_quirks(struct acpi_battery *battery)
581 {
582 if (dmi_name_in_vendors("Acer") &&
583 battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
584 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
585 }
586 }
587
588 /*
589 * According to the ACPI spec, some kinds of primary batteries can
590 * report percentage battery remaining capacity directly to OS.
591 * In this case, it reports the Last Full Charged Capacity == 100
592 * and BatteryPresentRate == 0xFFFFFFFF.
593 *
594 * Now we found some battery reports percentage remaining capacity
595 * even if it's rechargeable.
596 * https://bugzilla.kernel.org/show_bug.cgi?id=15979
597 *
598 * Handle this correctly so that they won't break userspace.
599 */
600 static void acpi_battery_quirks2(struct acpi_battery *battery)
601 {
602 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
603 return ;
604
605 if (battery->full_charge_capacity == 100 &&
606 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
607 battery->capacity_now >=0 && battery->capacity_now <= 100) {
608 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
609 battery->full_charge_capacity = battery->design_capacity;
610 battery->capacity_now = (battery->capacity_now *
611 battery->full_charge_capacity) / 100;
612 }
613 }
614
615 static int acpi_battery_update(struct acpi_battery *battery)
616 {
617 int result, old_present = acpi_battery_present(battery);
618 result = acpi_battery_get_status(battery);
619 if (result)
620 return result;
621 if (!acpi_battery_present(battery)) {
622 sysfs_remove_battery(battery);
623 battery->update_time = 0;
624 return 0;
625 }
626 if (!battery->update_time ||
627 old_present != acpi_battery_present(battery)) {
628 result = acpi_battery_get_info(battery);
629 if (result)
630 return result;
631 acpi_battery_quirks(battery);
632 acpi_battery_init_alarm(battery);
633 }
634 if (!battery->bat.dev)
635 sysfs_add_battery(battery);
636 result = acpi_battery_get_state(battery);
637 acpi_battery_quirks2(battery);
638 return result;
639 }
640
641 static void acpi_battery_refresh(struct acpi_battery *battery)
642 {
643 if (!battery->bat.dev)
644 return;
645
646 acpi_battery_get_info(battery);
647 /* The battery may have changed its reporting units. */
648 sysfs_remove_battery(battery);
649 sysfs_add_battery(battery);
650 }
651
652 /* --------------------------------------------------------------------------
653 FS Interface (/proc)
654 -------------------------------------------------------------------------- */
655
656 #ifdef CONFIG_ACPI_PROCFS_POWER
657 static struct proc_dir_entry *acpi_battery_dir;
658
659 static int acpi_battery_print_info(struct seq_file *seq, int result)
660 {
661 struct acpi_battery *battery = seq->private;
662
663 if (result)
664 goto end;
665
666 seq_printf(seq, "present: %s\n",
667 acpi_battery_present(battery)?"yes":"no");
668 if (!acpi_battery_present(battery))
669 goto end;
670 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
671 seq_printf(seq, "design capacity: unknown\n");
672 else
673 seq_printf(seq, "design capacity: %d %sh\n",
674 battery->design_capacity,
675 acpi_battery_units(battery));
676
677 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
678 seq_printf(seq, "last full capacity: unknown\n");
679 else
680 seq_printf(seq, "last full capacity: %d %sh\n",
681 battery->full_charge_capacity,
682 acpi_battery_units(battery));
683
684 seq_printf(seq, "battery technology: %srechargeable\n",
685 (!battery->technology)?"non-":"");
686
687 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
688 seq_printf(seq, "design voltage: unknown\n");
689 else
690 seq_printf(seq, "design voltage: %d mV\n",
691 battery->design_voltage);
692 seq_printf(seq, "design capacity warning: %d %sh\n",
693 battery->design_capacity_warning,
694 acpi_battery_units(battery));
695 seq_printf(seq, "design capacity low: %d %sh\n",
696 battery->design_capacity_low,
697 acpi_battery_units(battery));
698 seq_printf(seq, "cycle count: %i\n", battery->cycle_count);
699 seq_printf(seq, "capacity granularity 1: %d %sh\n",
700 battery->capacity_granularity_1,
701 acpi_battery_units(battery));
702 seq_printf(seq, "capacity granularity 2: %d %sh\n",
703 battery->capacity_granularity_2,
704 acpi_battery_units(battery));
705 seq_printf(seq, "model number: %s\n", battery->model_number);
706 seq_printf(seq, "serial number: %s\n", battery->serial_number);
707 seq_printf(seq, "battery type: %s\n", battery->type);
708 seq_printf(seq, "OEM info: %s\n", battery->oem_info);
709 end:
710 if (result)
711 seq_printf(seq, "ERROR: Unable to read battery info\n");
712 return result;
713 }
714
715 static int acpi_battery_print_state(struct seq_file *seq, int result)
716 {
717 struct acpi_battery *battery = seq->private;
718
719 if (result)
720 goto end;
721
722 seq_printf(seq, "present: %s\n",
723 acpi_battery_present(battery)?"yes":"no");
724 if (!acpi_battery_present(battery))
725 goto end;
726
727 seq_printf(seq, "capacity state: %s\n",
728 (battery->state & 0x04)?"critical":"ok");
729 if ((battery->state & 0x01) && (battery->state & 0x02))
730 seq_printf(seq,
731 "charging state: charging/discharging\n");
732 else if (battery->state & 0x01)
733 seq_printf(seq, "charging state: discharging\n");
734 else if (battery->state & 0x02)
735 seq_printf(seq, "charging state: charging\n");
736 else
737 seq_printf(seq, "charging state: charged\n");
738
739 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
740 seq_printf(seq, "present rate: unknown\n");
741 else
742 seq_printf(seq, "present rate: %d %s\n",
743 battery->rate_now, acpi_battery_units(battery));
744
745 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
746 seq_printf(seq, "remaining capacity: unknown\n");
747 else
748 seq_printf(seq, "remaining capacity: %d %sh\n",
749 battery->capacity_now, acpi_battery_units(battery));
750 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
751 seq_printf(seq, "present voltage: unknown\n");
752 else
753 seq_printf(seq, "present voltage: %d mV\n",
754 battery->voltage_now);
755 end:
756 if (result)
757 seq_printf(seq, "ERROR: Unable to read battery state\n");
758
759 return result;
760 }
761
762 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
763 {
764 struct acpi_battery *battery = seq->private;
765
766 if (result)
767 goto end;
768
769 if (!acpi_battery_present(battery)) {
770 seq_printf(seq, "present: no\n");
771 goto end;
772 }
773 seq_printf(seq, "alarm: ");
774 if (!battery->alarm)
775 seq_printf(seq, "unsupported\n");
776 else
777 seq_printf(seq, "%u %sh\n", battery->alarm,
778 acpi_battery_units(battery));
779 end:
780 if (result)
781 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
782 return result;
783 }
784
785 static ssize_t acpi_battery_write_alarm(struct file *file,
786 const char __user * buffer,
787 size_t count, loff_t * ppos)
788 {
789 int result = 0;
790 char alarm_string[12] = { '\0' };
791 struct seq_file *m = file->private_data;
792 struct acpi_battery *battery = m->private;
793
794 if (!battery || (count > sizeof(alarm_string) - 1))
795 return -EINVAL;
796 if (!acpi_battery_present(battery)) {
797 result = -ENODEV;
798 goto end;
799 }
800 if (copy_from_user(alarm_string, buffer, count)) {
801 result = -EFAULT;
802 goto end;
803 }
804 alarm_string[count] = '\0';
805 battery->alarm = simple_strtol(alarm_string, NULL, 0);
806 result = acpi_battery_set_alarm(battery);
807 end:
808 if (!result)
809 return count;
810 return result;
811 }
812
813 typedef int(*print_func)(struct seq_file *seq, int result);
814
815 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
816 acpi_battery_print_info,
817 acpi_battery_print_state,
818 acpi_battery_print_alarm,
819 };
820
821 static int acpi_battery_read(int fid, struct seq_file *seq)
822 {
823 struct acpi_battery *battery = seq->private;
824 int result = acpi_battery_update(battery);
825 return acpi_print_funcs[fid](seq, result);
826 }
827
828 #define DECLARE_FILE_FUNCTIONS(_name) \
829 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
830 { \
831 return acpi_battery_read(_name##_tag, seq); \
832 } \
833 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
834 { \
835 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
836 }
837
838 DECLARE_FILE_FUNCTIONS(info);
839 DECLARE_FILE_FUNCTIONS(state);
840 DECLARE_FILE_FUNCTIONS(alarm);
841
842 #undef DECLARE_FILE_FUNCTIONS
843
844 #define FILE_DESCRIPTION_RO(_name) \
845 { \
846 .name = __stringify(_name), \
847 .mode = S_IRUGO, \
848 .ops = { \
849 .open = acpi_battery_##_name##_open_fs, \
850 .read = seq_read, \
851 .llseek = seq_lseek, \
852 .release = single_release, \
853 .owner = THIS_MODULE, \
854 }, \
855 }
856
857 #define FILE_DESCRIPTION_RW(_name) \
858 { \
859 .name = __stringify(_name), \
860 .mode = S_IFREG | S_IRUGO | S_IWUSR, \
861 .ops = { \
862 .open = acpi_battery_##_name##_open_fs, \
863 .read = seq_read, \
864 .llseek = seq_lseek, \
865 .write = acpi_battery_write_##_name, \
866 .release = single_release, \
867 .owner = THIS_MODULE, \
868 }, \
869 }
870
871 static struct battery_file {
872 struct file_operations ops;
873 mode_t mode;
874 const char *name;
875 } acpi_battery_file[] = {
876 FILE_DESCRIPTION_RO(info),
877 FILE_DESCRIPTION_RO(state),
878 FILE_DESCRIPTION_RW(alarm),
879 };
880
881 #undef FILE_DESCRIPTION_RO
882 #undef FILE_DESCRIPTION_RW
883
884 static int acpi_battery_add_fs(struct acpi_device *device)
885 {
886 struct proc_dir_entry *entry = NULL;
887 int i;
888
889 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
890 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
891 if (!acpi_device_dir(device)) {
892 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
893 acpi_battery_dir);
894 if (!acpi_device_dir(device))
895 return -ENODEV;
896 }
897
898 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
899 entry = proc_create_data(acpi_battery_file[i].name,
900 acpi_battery_file[i].mode,
901 acpi_device_dir(device),
902 &acpi_battery_file[i].ops,
903 acpi_driver_data(device));
904 if (!entry)
905 return -ENODEV;
906 }
907 return 0;
908 }
909
910 static void acpi_battery_remove_fs(struct acpi_device *device)
911 {
912 int i;
913 if (!acpi_device_dir(device))
914 return;
915 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
916 remove_proc_entry(acpi_battery_file[i].name,
917 acpi_device_dir(device));
918
919 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
920 acpi_device_dir(device) = NULL;
921 }
922
923 #endif
924
925 /* --------------------------------------------------------------------------
926 Driver Interface
927 -------------------------------------------------------------------------- */
928
929 static void acpi_battery_notify(struct acpi_device *device, u32 event)
930 {
931 struct acpi_battery *battery = acpi_driver_data(device);
932 struct device *old;
933
934 if (!battery)
935 return;
936 old = battery->bat.dev;
937 if (event == ACPI_BATTERY_NOTIFY_INFO)
938 acpi_battery_refresh(battery);
939 acpi_battery_update(battery);
940 acpi_bus_generate_proc_event(device, event,
941 acpi_battery_present(battery));
942 acpi_bus_generate_netlink_event(device->pnp.device_class,
943 dev_name(&device->dev), event,
944 acpi_battery_present(battery));
945 /* acpi_battery_update could remove power_supply object */
946 if (old && battery->bat.dev)
947 power_supply_changed(&battery->bat);
948 }
949
950 static int battery_notify(struct notifier_block *nb,
951 unsigned long mode, void *_unused)
952 {
953 struct acpi_battery *battery = container_of(nb, struct acpi_battery,
954 pm_nb);
955 switch (mode) {
956 case PM_POST_SUSPEND:
957 sysfs_remove_battery(battery);
958 sysfs_add_battery(battery);
959 break;
960 }
961
962 return 0;
963 }
964
965 static int acpi_battery_add(struct acpi_device *device)
966 {
967 int result = 0;
968 struct acpi_battery *battery = NULL;
969 acpi_handle handle;
970 if (!device)
971 return -EINVAL;
972 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
973 if (!battery)
974 return -ENOMEM;
975 battery->device = device;
976 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
977 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
978 device->driver_data = battery;
979 mutex_init(&battery->lock);
980 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
981 "_BIX", &handle)))
982 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
983 acpi_battery_update(battery);
984 #ifdef CONFIG_ACPI_PROCFS_POWER
985 result = acpi_battery_add_fs(device);
986 #endif
987 if (!result) {
988 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
989 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
990 device->status.battery_present ? "present" : "absent");
991 } else {
992 #ifdef CONFIG_ACPI_PROCFS_POWER
993 acpi_battery_remove_fs(device);
994 #endif
995 kfree(battery);
996 }
997
998 battery->pm_nb.notifier_call = battery_notify;
999 register_pm_notifier(&battery->pm_nb);
1000
1001 return result;
1002 }
1003
1004 static int acpi_battery_remove(struct acpi_device *device, int type)
1005 {
1006 struct acpi_battery *battery = NULL;
1007
1008 if (!device || !acpi_driver_data(device))
1009 return -EINVAL;
1010 battery = acpi_driver_data(device);
1011 unregister_pm_notifier(&battery->pm_nb);
1012 #ifdef CONFIG_ACPI_PROCFS_POWER
1013 acpi_battery_remove_fs(device);
1014 #endif
1015 sysfs_remove_battery(battery);
1016 mutex_destroy(&battery->lock);
1017 kfree(battery);
1018 return 0;
1019 }
1020
1021 /* this is needed to learn about changes made in suspended state */
1022 static int acpi_battery_resume(struct acpi_device *device)
1023 {
1024 struct acpi_battery *battery;
1025 if (!device)
1026 return -EINVAL;
1027 battery = acpi_driver_data(device);
1028 battery->update_time = 0;
1029 acpi_battery_update(battery);
1030 return 0;
1031 }
1032
1033 static struct acpi_driver acpi_battery_driver = {
1034 .name = "battery",
1035 .class = ACPI_BATTERY_CLASS,
1036 .ids = battery_device_ids,
1037 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1038 .ops = {
1039 .add = acpi_battery_add,
1040 .resume = acpi_battery_resume,
1041 .remove = acpi_battery_remove,
1042 .notify = acpi_battery_notify,
1043 },
1044 };
1045
1046 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1047 {
1048 if (acpi_disabled)
1049 return;
1050 #ifdef CONFIG_ACPI_PROCFS_POWER
1051 acpi_battery_dir = acpi_lock_battery_dir();
1052 if (!acpi_battery_dir)
1053 return;
1054 #endif
1055 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1056 #ifdef CONFIG_ACPI_PROCFS_POWER
1057 acpi_unlock_battery_dir(acpi_battery_dir);
1058 #endif
1059 return;
1060 }
1061 return;
1062 }
1063
1064 static int __init acpi_battery_init(void)
1065 {
1066 async_schedule(acpi_battery_init_async, NULL);
1067 return 0;
1068 }
1069
1070 static void __exit acpi_battery_exit(void)
1071 {
1072 acpi_bus_unregister_driver(&acpi_battery_driver);
1073 #ifdef CONFIG_ACPI_PROCFS_POWER
1074 acpi_unlock_battery_dir(acpi_battery_dir);
1075 #endif
1076 }
1077
1078 module_init(acpi_battery_init);
1079 module_exit(acpi_battery_exit);
kernel source for telekom puls (alcatel/mediatek)